Air conditioning system, control method and control device thereof, and non-volatile storage medium

Abstract

The present invention provides an air conditioning system and its control method and control device, and a non-volatile storage medium. The control method of the air conditioning system includes: obtaining the return air temperature T of the air conditioning indoor unit; ii and air conditioning system high pressure T h ; Get the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract system high pressure T h Determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between; when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h The control method of the air conditioning system of the present invention solves the problem in the prior art that the multi-split air conditioning system often experiences a return air short circuit phenomenon, which causes the system to shut down due to a fault.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and in particular to an air conditioning system, a control method and a control device thereof, and a non-volatile storage medium. Background Art

[0002] Multi-split air conditioning systems, due to their mature technology and flexible application, are widely used in various locations, such as hotels and office buildings, to meet the cooling and heating needs of diverse users. In practical applications, a common configuration is to use a multi-split main unit with top or side airflow, combined with a ducted indoor unit. Ducted indoor units are typically concealed inside the ceiling near the room's entrance, with side airflow and bottom return air. This installation method conserves limited indoor space and reduces overall installation and operating costs, leading to its widespread adoption in engineering practice.

[0003] However, existing multi-split air-conditioning systems often experience the phenomenon of "return air short circuit". The so-called "return air short circuit" means that the hot air blown out from the indoor unit's air outlet is directly sucked into the return air outlet without sufficient heat exchange with the cold air in the room, resulting in uneven heat exchange of the air on the indoor side, poor heating effect, and poor indoor thermal comfort; at the same time, the indoor unit's return air outlet inhales a large amount of high-temperature air, causing the entire air-conditioning system to have excessive pressure, triggering high-pressure protection, and causing the system to fail and shut down. Summary of the Invention

[0004] The main purpose of the present invention is to provide an air-conditioning system and its control method and control device, as well as a non-volatile storage medium, to solve the problem in the prior art that a multi-split air-conditioning system often experiences a return air short circuit, resulting in its failure and shutdown.

[0005] In order to achieve the above object, according to a first aspect of the present invention, a control method for an air conditioning system is provided, comprising: obtaining the return air temperature T of the indoor unit of the air conditioner; ii and air conditioning system high pressure T h ; Get the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract system high pressure T h Determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between; when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h .

[0006] Furthermore, when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h The method includes: setting multiple temperature difference gradient levels, and adjusting the air guide angle of the air guide blade according to the temperature difference gradient level at which the temperature difference value T1 is located; wherein the temperature ranges corresponding to the multiple temperature difference gradient levels increase in sequence, the air guide angle of the air guide blade of the air outlet corresponding to each temperature difference gradient level increases in sequence, and the air guide angle of the air guide blade of the return air outlet corresponding to each temperature difference gradient level decreases in sequence.

[0007] Furthermore, multiple temperature difference gradient levels include a first level step1, a second level step2, a third level step3, a fourth level step4, and a fifth level step5; wherein, step1∈[△T1, △T1+n), step2∈[△T1+n, △T1+2n), step3∈[△T1+2n, △T1+3n), step4∈[△T1+3n, △T1+4n), step5≥△T1+4n, and n is an arbitrary temperature value; the guide angle of the air guide blade is a, 0°≤a≤90°, wherein, when T1 is at the first level step1, the guide angle of the air guide blade at the air outlet is adjusted to 30°, and the return air outlet is adjusted to adjust the guide angle of the air guide blades at the air outlet to 75°; when T1 is at the second level step 2, adjust the guide angle of the air guide blades at the air outlet to 45°, and adjust the guide angle of the air guide blades at the return air outlet to 60°; when T1 is at the third level step 3, adjust the guide angle of the air guide blades at the air outlet to 60°, and adjust the guide angle of the air guide blades at the return air outlet to 45°; when T1 is at the fourth level step 4, adjust the guide angle of the air guide blades at the air outlet to 75°, and adjust the guide angle of the air guide blades at the return air outlet to 30°; when T1 is at the fifth level step 5, adjust the guide angle of the air guide blades at the air outlet to 90°, and adjust the guide angle of the air guide blades at the return air outlet to 15°.

[0008] Furthermore, when the air conditioner indoor unit is a static pressure type duct indoor unit, the control method of the air conditioner system includes: when T1≥△T1 and T2≤△T h When the air conditioner is turned off, reduce the static pressure value of the indoor unit of the air conditioner.

[0009] Furthermore, when the air-conditioning indoor unit is a static pressure type duct indoor unit, the control method of the air-conditioning system includes: setting multiple static pressure gears, the multiple static pressure gears include the default static pressure gear, the first static pressure gear P1, the second static pressure gear P2, the third static pressure gear P3, and the fourth static pressure gear P4, and the static pressure values ​​corresponding to the default static pressure gear, the first static pressure gear P1, the second static pressure gear P2, the third static pressure gear P3, and the fourth static pressure gear P4 increase in sequence; wherein the default static pressure gear is the factory default static pressure gear; when T1 is at the first level step1, the air-conditioning indoor unit operates at the default static pressure gear; when T1 is at the second level step2, the air-conditioning indoor unit operates at the first static pressure gear P1, and when T h Decrease (△T h -Th max ) / 2, the air conditioner indoor unit is adjusted down from the first static pressure level P1 to the default static pressure level; when T1 is at the third level step3, T h Each decrease (△T h -Th max ) / 3, the air conditioner indoor unit is gradually reduced from the second static pressure level P2 to the default static pressure level; when T1 is at the fourth level step4, T h Each decrease (△T h -Th max ) / 4, the air conditioner indoor unit is gradually reduced from the third static pressure level P3 to the default static pressure level; when T1 is at the fifth level step5, T h Each decrease (△T h -Th max ) / 5, the static pressure of the air conditioner indoor unit is gradually reduced from the fourth static pressure level P4 to the default static pressure level.

[0010] Furthermore, the control method of the air conditioning system further includes: determining whether the current operating mode of the air conditioning system is a heating mode, and when the operating mode is a heating mode, obtaining the return air temperature T of the air conditioning indoor unit ii and air conditioning system high pressure T h , and the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract system high pressure T h Determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between; when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h .

[0011] According to a second aspect of the present invention, an air-conditioning system is provided, comprising: an air-conditioning indoor unit having an air outlet and a return air outlet, wherein both the air outlet and the return air outlet are provided with a guide device, the guide device comprising a guide vane for guiding air, and the guide angle of the guide vane can be adjusted; a temperature detection element for detecting the return air temperature of the return air outlet; a pressure detection element for detecting the system high pressure of the air-conditioning system; a control device for executing the above-mentioned control method of the air-conditioning system, the temperature detection element and the pressure detection element are both communicatively connected to the control device; the control device is communicatively connected to the guide device to adjust the guide angle of the guide vane.

[0012] Furthermore, the guide angle of the guide blade is a, and the width of the guide blade is b; wherein 0°≤a≤90°; when a=45°, the width of the portion of the guide blade extending out of the air outlet frame of the air conditioner indoor unit is d, and d≥b / 4.

[0013] Furthermore, the guide device includes a plurality of guide blades, and the plurality of guide blades are arranged at intervals along a preset direction.

[0014] Furthermore, the plurality of guide blades are arranged at equal intervals along a preset direction.

[0015] According to a third aspect of the present invention, a control device for an air conditioning system is provided, which is used to execute the above-mentioned control method for an air conditioning system. The control device for the air conditioning system comprises: an acquisition unit, which is used to acquire the return air temperature T of the indoor unit of the air conditioner. ii and air conditioning system high pressure T h , and the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract system high pressure T h The pressure difference T2; a judgment unit for judging the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between the control unit is used when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h .

[0016] According to a fourth aspect of the present invention, a non-volatile storage medium is provided. The non-volatile storage medium includes a stored program, wherein when the program runs, the device where the non-volatile storage medium is located is controlled to execute the above-mentioned air-conditioning system control method.

[0017] By applying the technical solution of the present invention, the control method of the air conditioning system obtains the return air temperature T of the air conditioning indoor unit. ii、System high pressure T of air conditioning system h , and according to the preset temperature value T ic And the preset high voltage protection value Th max , calculate the temperature difference T1 and the pressure difference T2, then determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between T1≥△T1 and T2≤△T h When the air supply direction, return air direction and air volume are adjusted by adjusting the guide angle of the air guide blades at the air outlet and / or return air outlet, the return air direction and air volume are adjusted to avoid the return air short circuit phenomenon in the air conditioning system, thereby avoiding the problem of excessive pressure in the entire air conditioning system, which leads to system failure and shutdown. The adjustment of the guide angle of the air guide blades at the air outlet and / or return air outlet continues until T1 < △T1 and T2 > △T h . BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A flow chart showing an embodiment of a method for controlling an air-conditioning system according to the present invention is shown;

[0020] Figure 2 A schematic diagram showing an embodiment of an air conditioning system according to the present invention is shown;

[0021] Figure 3 A schematic diagram showing an embodiment of a control device for an air-conditioning system according to the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Guide device; 11. Guide vane;

[0024] 20. Air outlet frame;

[0025] 30. Get unit;

[0026] 40. Judgment unit;

[0027] 50. Control unit. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] The present invention provides a control method for an air conditioning system. Figure 1 ,include:

[0032] Step S100, obtaining the return air temperature T of the air conditioner indoor unit ii and air conditioning system high pressure T h ; Get the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract system high pressure T h The pressure difference T2;

[0033] Step S200: Determine the relationship between the temperature difference T1 and the preset temperature difference ΔT1, and the pressure difference T2 and the preset pressure difference ΔT h the relationship between;

[0034] Step S300: When T1≥ΔT1 and T2≤ΔT h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h .

[0035] The control method of the air conditioning system of the present invention obtains the return air temperature T of the air conditioning indoor unit ii 、System high pressure T of air conditioning system h , and according to the preset temperature value T ic And the preset high voltage protection value Th max , calculate the temperature difference T1 and the pressure difference T2, then determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between T1≥△T1 and T2≤△T hWhen the air supply direction, return air direction and air volume are adjusted by adjusting the guide angle of the air guide blades at the air outlet and / or return air outlet, the return air direction and air volume are adjusted to avoid the return air short circuit phenomenon in the air conditioning system, thereby avoiding the problem of excessive pressure in the entire air conditioning system, which leads to system failure and shutdown. The adjustment of the guide angle of the air guide blades at the air outlet and / or return air outlet continues until T1 < △T1 and T2 > △T h .

[0036] It should be noted that the system high pressure is the refrigerant pressure value on the high pressure side of the air conditioning system, that is, the pressure on the exhaust side of the compressor; the preset temperature value T ic This is the temperature set by the remote controller.

[0037] In this embodiment, when T1≥ΔT1 and T2≤ΔT h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h The method includes: setting multiple temperature difference gradient levels, and adjusting the air guide angle of the air guide blade according to the temperature difference gradient level at which the temperature difference value T1 is located; wherein the temperature ranges corresponding to the multiple temperature difference gradient levels increase in sequence, the air guide angle of the air guide blade of the air outlet corresponding to each temperature difference gradient level increases in sequence, and the air guide angle of the air guide blade of the return air outlet corresponding to each temperature difference gradient level decreases in sequence.

[0038] In specific implementation, by adjusting the air guide angle of the air guide blades according to the temperature difference gradient level of the temperature difference value T1, the wind direction and air volume of the air conditioning system can be finely adjusted, thereby enhancing the adaptability of the air conditioning system to environmental changes.

[0039] In this embodiment, as shown in Table 1, the multiple temperature difference gradient levels include the first level step1, the second level step2, the third level step3, the fourth level step4, and the fifth level step5; wherein, step1∈[△T1, △T1+n), step2∈[△T1+n, △T1+2n), step3∈[△T1+2n, △T1+3n), step4∈[△T1+3n, △T1+4n), step5≥△T1+4n, and n is an arbitrary temperature value; the guide angle of the air guide blade is a, 0°≤a≤90°, wherein, when T1 is at the first level step1, the guide angle of the air guide blade at the air outlet is adjusted to 30°, and the guide angle is adjusted to 0°. Adjust the guide angle of the guide blades at the return air outlet to 75°; when T1 is at the second level step 2, adjust the guide angle of the guide blades at the outlet to 45°, and adjust the guide angle of the guide blades at the return air outlet to 60°; when T1 is at the third level step 3, adjust the guide angle of the guide blades at the outlet to 60°, and adjust the guide angle of the guide blades at the return air outlet to 45°; when T1 is at the fourth level step 4, adjust the guide angle of the guide blades at the outlet to 75°, and adjust the guide angle of the guide blades at the return air outlet to 30°; when T1 is at the fifth level step 5, adjust the guide angle of the guide blades at the outlet to 90°, and adjust the guide angle of the guide blades at the return air outlet to 15°.

[0040] Table 1 Outlet and return air guide angles at each temperature difference gradient level

[0041]

[0042] In specific implementation, the severity of the return air short circuit of the air-conditioning system can be judged according to the temperature difference gradient level of T1, and the air guide angle of the air guide blades can be controlled to different degrees. Precise adjustment can improve the adjustment response speed and stability of the air-conditioning system, making the air-conditioning system more adaptable to the environment.

[0043] It should be noted that the value of n can be set according to the specific air conditioning system; the judgment of the temperature difference gradient level at T1 is only made once when entering the control, and the air guide angle adjustment of the air guide blade continues until the conditions T1 < △T1 and T2 > △T are met. h Finish.

[0044] In this embodiment, when the air conditioner indoor unit is a static pressure type duct indoor unit, the control method of the air conditioner system includes: when T1≥△T1 and T2≤△T h When the static pressure value of the air conditioner indoor unit is reduced, the static pressure value of the air conditioner indoor unit is the static pressure value of the air outlet.

[0045] In practice, for static pressure ducted units, short-circuiting of return air can be avoided by adjusting the static pressure at the air outlet and the angles of the outlet and return air guides. This, by increasing the static pressure adjustment of the air conditioner's indoor unit, further prevents short-circuiting of return air in the air conditioning system, thereby preventing the entire air conditioning system from experiencing excessive pressure, which can lead to system failures and shutdowns.

[0046] In this embodiment, when the air-conditioning indoor unit is a static pressure type duct indoor unit, the control method of the air-conditioning system includes: setting multiple static pressure gears, the multiple static pressure gears include a default static pressure gear, a first static pressure gear P1, a second static pressure gear P2, a third static pressure gear P3, and a fourth static pressure gear P4, and the static pressure values ​​corresponding to the default static pressure gear, the first static pressure gear P1, the second static pressure gear P2, the third static pressure gear P3, and the fourth static pressure gear P4 increase in sequence; wherein the default static pressure gear is the factory default static pressure gear; when T1 is at the first level step1, the air-conditioning indoor unit operates at the default static pressure gear; when T1 is at the second level step2, the air-conditioning indoor unit operates at the first static pressure gear P1, and when T h Decrease (△T h -Th max ) / 2, the air conditioner indoor unit is adjusted down from the first static pressure level P1 to the default static pressure level; when T1 is at the third level step3, T h Each decrease (△T h -Th max ) / 3, the air conditioner indoor unit is gradually reduced from the second static pressure level P2 to the default static pressure level; when T1 is at the fourth level step4, T h Each decrease (△T h -Th max ) / 4, the air conditioner indoor unit is gradually reduced from the third static pressure level P3 to the default static pressure level; when T1 is at the fifth level step5, T h Each decrease (△T h -Th max ) / 5, the static pressure of the air conditioner indoor unit is gradually reduced from the fourth static pressure level P4 to the default static pressure level.

[0047] During specific implementation, the severity of the return air short circuit of the air-conditioning system can be judged according to the temperature difference gradient level of T1, and different degrees of combined control of the air outlet static pressure and the air guide angle of the air guide blades can be performed, so that the air-conditioning system can respond more flexibly to indoor temperature changes and avoid return air short circuit in the air-conditioning system.

[0048] Table 2 Initial air outlet static pressure level, air outlet and return air guide angles at each temperature difference gradient level

[0049]

[0050] In specific implementation, Table 2 shows the initial static pressure gear control and air guide angle under each temperature difference gradient level. In the control of each temperature difference gradient level, the air guide angle of the air guide blade remains unchanged, and the air outlet static pressure gear is adjusted according to the system high pressure T h The reduction is gradually reduced: For the second level step2, when the system high pressure drops (△T h -Th max ) / 2, the static pressure gear is lowered by one level. For the third level step3, when the system high pressure drops by (△T h -Th max ) / 3, the static pressure gear is lowered by one level. For the fourth level, step 4, when the system high pressure drops by (△T h -Th max ) / 4, the static pressure gear is lowered by one level. For the fifth level, step 5, when the system high pressure drops by (△T h -Th max ) / 5, the static pressure gear is adjusted down one level. The control of each temperature difference gradient level is maintained until the conditions T1<△T1 and T2>△T are met. h Finish.

[0051] In this embodiment, the control method of the air conditioning system further includes: determining whether the current operating mode of the air conditioning system is the heating mode, and when the operating mode is the heating mode, obtaining the return air temperature T of the air conditioning indoor unit. ii and air conditioning system high pressure T h , and the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract system high pressure T h Determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between; when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h .

[0052] In specific implementation, when the air conditioning system is turned on, the operation mode judgment module is entered, and the system operation status is first judged. When the air conditioning system operation status is heating, the return air short circuit judgment module is entered, that is, the return air temperature T of the air conditioning indoor unit is obtained by executing the steps. ii 、System high pressure T of air conditioning system h , return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Thmax Subtract system high pressure T h Determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h When T1≥△T1 and T2≤△T h When the air conditioning system enters the anti-return air short circuit processing module, that is, the air guide angle of the air guide blades of the air outlet and / or return air outlet of the air conditioning indoor unit is adjusted to make T1 < △T1 and T2 > △T h .

[0053] In specific implementation, when T1<△T1 or T2>△T h The air conditioning system operates normally.

[0054] The present invention also provides an air conditioning system, please refer to Figure 2 , including: an air-conditioning indoor unit, having an air outlet and a return air outlet, wherein the air outlet and the return air outlet are both provided with a guide device 10, the guide device 10 includes a guide vane 11 for guiding air, and the guide angle of the guide vane 11 can be adjusted; a temperature detection component for detecting the return air temperature of the return air outlet; a pressure detection component for detecting the system high pressure of the air-conditioning system; a control device for executing the control method of the air-conditioning system of the above embodiment, the temperature detection component and the pressure detection component are both communicated with the control device; the control device is communicated with the guide device 10 to adjust the guide angle of the guide vane 11.

[0055] In specific implementation, by setting temperature detection components, pressure detection components and control devices, the air conditioning system can obtain the return air temperature T of the air conditioning indoor unit. ii 、System high pressure T of air conditioning system h , and according to the preset temperature value T ic And the preset high voltage protection value Th max , calculate the temperature difference T1 and the pressure difference T2, then determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between T1≥△T1 and T2≤△T h When the air supply direction, return air direction and air volume are adjusted by adjusting the guide angle of the air guide blades at the air outlet and / or return air outlet, the return air direction and air volume are adjusted to avoid the return air short circuit phenomenon in the air conditioning system, thereby avoiding the problem of excessive pressure in the entire air conditioning system, which leads to system failure and shutdown. The adjustment of the guide angle of the air guide blades at the air outlet and / or return air outlet continues until T1 < △T1 and T2 > △T h .

[0056] Optionally, the temperature detection element is a temperature sensing package.

[0057] Specifically, the guide vane 11 has an air guide angle of a and a width of b, where 0° ≤ a ≤ 90°. When a = 45°, the width of the portion of the guide vane 11 extending beyond the air outlet frame 20 of the air conditioner indoor unit is d, where d ≥ b / 4. This configuration effectively adjusts the direction of supply and return air, as well as the air volume, and prevents return air short-circuiting in the air conditioning system.

[0058] It should be noted that the wind guide angle a is Figure 2 The vertical angle of the guide blade 11 in the guide blade 11, the width b and d of the guide blade 11 are as follows Figure 2 Marked in the middle.

[0059] Specifically, the guide device 10 includes a plurality of guide blades 11, which are arranged at intervals along a preset direction. Such an arrangement can flexibly adjust the airflow distribution of the air outlet and the return air outlet, further preventing the return air short circuit phenomenon in the air conditioning system.

[0060] Optionally, multiple guide blades 11 are arranged at equal intervals along a preset direction, wherein the spacing between two adjacent guide blades 11 is c. Such an arrangement can optimize the airflow distribution of the air outlet and the return air outlet, further avoiding the return air short circuit phenomenon in the air conditioning system.

[0061] The present invention also provides a control device for an air conditioning system, please refer to Figure 3 , used to execute the control method of the air-conditioning system of the above embodiment, the control device of the air-conditioning system includes:

[0062] The acquisition unit 30 is used to obtain the return air temperature T of the air conditioner indoor unit. ii and air conditioning system high pressure T h , and the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract system high pressure T h The pressure difference T2;

[0063] The judgment unit 40 is used to judge the relationship between the temperature difference T1 and the preset temperature difference ΔT1, and the pressure difference T2 and the preset pressure difference ΔT h the relationship between;

[0064] The control unit 50 is used for when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h .

[0065] In specific implementation, the control device of the air conditioning system includes: an acquisition unit 30, a judgment unit 40, and a control unit 50, which can obtain the return air temperature T of the air conditioning indoor unit. ii 、System high pressure T of air conditioning system h , and according to the preset temperature value T ic And the preset high voltage protection value Th max , calculate the temperature difference T1 and the pressure difference T2, then determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between T1≥△T1 and T2≤△T h When the air is in the supply direction, return direction and air volume are adjusted by adjusting the guide angle of the air guide blades of the air outlet and / or return air outlet to avoid return air short circuit in the air conditioning system, thereby avoiding the problem of excessive pressure in the entire air conditioning system, which may lead to system failure and shutdown.

[0066] The present invention also provides a non-volatile storage medium, which includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the control method of the air-conditioning system of the above embodiment.

[0067] Specifically, the above storage medium is used to store program instructions that execute the following functions to achieve the following functions:

[0068] Get the return air temperature T of the air conditioner indoor unit ii and air conditioning system high pressure T h , and the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract system high pressure T h Determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between; when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the guide device is adjusted so that T1 < △T1 and T2 > △T h .

[0069] The control method and air guide device 10 disclosed in the present invention effectively prevent air conditioning system shutdowns caused by "return air short circuits" due to improper design and installation. For applications where installation space is limited and the distance between the indoor unit's supply and return air supply cannot meet the design specifications, the indoor unit can be equipped with an air guide device 10. For example, ducted air conditioners can be equipped with adjustable angle air guide devices 10 at their air outlets and return air outlets.

[0070] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0071] The control method of the air conditioning system of the present invention obtains the return air temperature T of the air conditioning indoor unit ii 、System high pressure T of air conditioning system h , and according to the preset temperature value T ic And the preset high voltage protection value Th max , calculate the temperature difference T1 and the pressure difference T2, then determine the relationship between the temperature difference T1 and the preset temperature difference △T1, and the pressure difference T2 and the preset pressure difference △T h The relationship between T1≥△T1 and T2≤△T h When the air supply direction, return air direction and air volume are adjusted by adjusting the guide angle of the air guide blades at the air outlet and / or return air outlet, the return air direction and air volume are adjusted to avoid the return air short circuit phenomenon in the air conditioning system, thereby avoiding the problem of excessive pressure in the entire air conditioning system, which leads to system failure and shutdown. The adjustment of the guide angle of the air guide blades at the air outlet and / or return air outlet continues until T1 < △T1 and T2 > △T h .

[0072] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0073] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "upper" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in a drawing is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0074] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for controlling an air conditioning system, characterized in that: include: Get the return air temperature T of the air conditioner indoor unit ii and air conditioning system high pressure T h ; The return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract the system high pressure T h The pressure difference T2; Determine the relationship between the temperature difference T1 and the preset temperature difference ΔT1, and the pressure difference T2 and the preset pressure difference ΔT h the relationship between; When T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the air guide device is adjusted so that T1 < ΔT1 and T2 > ΔT h ; When T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the air guide device is adjusted so that T1 < ΔT1 and T2 > ΔT h The methods include: Setting a plurality of temperature difference gradient levels, and adjusting the air guide angle of the air guide blade according to the temperature difference gradient level at which the temperature difference value T1 is located; Among them, the temperature ranges corresponding to the multiple temperature difference gradient levels increase successively, the air guiding angles of the air guide blades of the air outlet corresponding to each temperature difference gradient level increase successively, and the air guiding angles of the air guide blades of the return air outlet corresponding to each temperature difference gradient level decrease successively.

2. The control method of the air conditioning system according to claim 1, characterized in that: The multiple temperature difference gradient levels include a first level step1, a second level step2, a third level step3, a fourth level step4, and a fifth level step5; wherein step1∈[△T1, △T1+n), step2∈[△T1+n, △T1+2n), step3∈[△T1+2n, △T1+3n), step4∈[△T1+3n, △T1+4n), step5≥△T1+4n, and n is an arbitrary temperature value; The wind guide angle of the wind guide blade is a, 0°≤a≤90°, wherein, When T1 is at the first level step 1, the air guiding angle of the air guide blades at the air outlet is adjusted to 30°, and the air guiding angle of the air guide blades at the air return outlet is adjusted to 75°; When T1 is at the second level step 2, the air guiding angle of the air guide blades at the air outlet is adjusted to 45°, and the air guiding angle of the air guide blades at the air return outlet is adjusted to 60°; When T1 is at the third level step 3, the air guiding angle of the air guide blades at the air outlet is adjusted to 60°, and the air guiding angle of the air guide blades at the air return outlet is adjusted to 45°; When T1 is at the fourth level step 4, the air guiding angle of the air guide blades at the air outlet is adjusted to 75°, and the air guiding angle of the air guide blades at the air return outlet is adjusted to 30°; When T1 is at the fifth level step 5, the air guiding angle of the air guiding blades of the air outlet is adjusted to 90°, and the air guiding angle of the air guiding blades of the return air outlet is adjusted to 15°.

3. The control method of the air conditioning system according to claim 1, characterized in that: When the air-conditioning indoor unit is a static pressure type duct indoor unit, the control method of the air-conditioning system includes: When T1≥△T1 and T2≤△T h When the static pressure value of the air conditioner indoor unit is reduced.

4. The control method of the air conditioning system according to claim 2, characterized in that: When the air-conditioning indoor unit is a static pressure type duct indoor unit, the control method of the air-conditioning system includes: Multiple static pressure gears are set, including a default static pressure gear, a first static pressure gear P1, a second static pressure gear P2, a third static pressure gear P3, and a fourth static pressure gear P4. The static pressure values ​​corresponding to the default static pressure gear, the first static pressure gear P1, the second static pressure gear P2, the third static pressure gear P3, and the fourth static pressure gear P4 are increased in sequence; wherein the default static pressure gear is the factory default static pressure gear; When T1 is at the first level step 1, the air conditioner indoor unit operates at the default static pressure level; When T1 is at the second level step2, the air conditioner indoor unit operates at the first static pressure level P1. h Decrease (△T h -Th max ) / 2, the air-conditioning indoor unit is adjusted down from the first static pressure level P1 to the default static pressure level; When T1 is at the third level step 3, T h Each decrease (△T h -Th max ) / 3, the air-conditioning indoor unit is gradually lowered from the second static pressure level P2 to the default static pressure level; When T1 is at the fourth level step 4, T h Each decrease (△T h -Th max ) / 4, the air-conditioning indoor unit is gradually lowered from the third static pressure level P3 to the default static pressure level; When T1 is at the fifth level step 5, T h Each decrease (△T h -Th max ) / 5, the air-conditioning indoor unit is gradually lowered from the fourth static pressure level P4 to the default static pressure level.

5. The control method of the air conditioning system according to claim 1, characterized in that: The control method of the air conditioning system further includes: Determine whether the current operating mode of the air conditioning system is the heating mode. If the operating mode is the heating mode, obtain the return air temperature T of the air conditioning indoor unit. ii and air conditioning system high pressure T h , and the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract the system high pressure T h The pressure difference T2; Determine the relationship between the temperature difference T1 and the preset temperature difference ΔT1, and the pressure difference T2 and the preset pressure difference ΔT h The relationship between; when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the air guide device is adjusted so that T1 < ΔT1 and T2 > ΔT h .

6. An air conditioning system, characterized in that: include: An air conditioner indoor unit has an air outlet and an air return outlet, wherein the air outlet and the air return outlet are both provided with a guide device (10), the guide device (10) comprises a guide blade (11) for guiding air, and the guide angle of the guide blade (11) is adjustable; A temperature detection element, used to detect the return air temperature of the return air outlet; A pressure detection component, used for detecting the system high pressure of the air conditioning system; A control device for executing the control method of the air-conditioning system according to any one of claims 1 to 5, wherein the temperature detecting element and the pressure detecting element are both communicatively connected to the control device; and the control device is communicatively connected to the guide device (10) to adjust the air guide angle of the guide blade (11).

7. The air conditioning system according to claim 6, characterized in that The guide angle of the guide blade (11) is a, and the width of the guide blade (11) is b; wherein 0°≤a≤90°; when a=45°, the width of the portion of the guide blade (11) extending out of the air outlet frame (20) of the air conditioner indoor unit is d, and d≥b / 4.

8. The air conditioning system according to claim 6, characterized in that The guide device (10) comprises a plurality of guide blades (11), and the plurality of guide blades (11) are arranged at intervals along a preset direction.

9. The air conditioning system according to claim 8, characterized in that The plurality of guide blades (11) are arranged at equal intervals along the preset direction.

10. A control device for an air conditioning system, characterized in that: For executing the control method of the air-conditioning system according to any one of claims 1 to 5, the control device of the air-conditioning system comprises: Acquisition unit, used to obtain the return air temperature T of the air conditioner indoor unit ii and air conditioning system high pressure T h , and the return air temperature T ii Subtract the preset temperature value T ic The temperature difference T1 and the preset high voltage protection value Th max Subtract the system high pressure T h The pressure difference T2; The judgment unit is used to judge the relationship between the temperature difference T1 and the preset temperature difference ΔT1, and the pressure difference T2 and the preset pressure difference ΔT h the relationship between; Control unit, used when T1≥△T1 and T2≤△T h When the air outlet and / or return air outlet of the air conditioner indoor unit are adjusted, the air guide angle of the air guide blade of the air guide device is adjusted so that T1 < ΔT1 and T2 > ΔT h .

11. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the control method of the air-conditioning system according to any one of claims 1 to 5.

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