Air conditioning system, air conditioner and control method

Abstract

The invention provides an air conditioning system, an air conditioner and a control method. The air conditioning system comprises a compressor, a four-way valve, an outdoor heat exchanger, an electronic expansion valve and an indoor heat exchanger. The compressor, the four-way valve, the outdoor heat exchanger, the electronic expansion valve and the indoor heat exchanger are connected to form an air conditioning circulation loop. The indoor heat exchanger comprises a plurality of sets of heat exchange pipes, and the indoor heat exchanger can select the communication mode of the multiple sets of heat exchange pipes according to the mode of the air conditioner. According to the air conditioner, the technical problem that in the prior art, a heat exchanger adopts a fixed flow path, heat exchange requirements under different requirements of the air conditioner cannot be met, and the user experience is poor can be solved.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to an air conditioning system, an air conditioner, and a control method. Background Technology

[0002] In both cooling and heating modes, the indoor heat exchanger plays different roles in the circulation: as an evaporator in cooling mode and as a condenser in heating mode. The optimal flow path differs for the evaporator and condenser. For the condenser, a longer refrigerant flow path results in better subcooling within the heat exchanger; for the evaporator, more refrigerant paths lead to better heat exchange. Therefore, existing indoor heat exchangers in air conditioners cannot achieve optimal operation. Furthermore, air conditioners are designed to operate at full load, typically with flow path design based on maximum load. During non-full load operation, uneven flow distribution can occur, leading to poor heat exchange. Even at lower loads, fixed heat exchanger flow paths and compressor frequency limitations can cause the output load to exceed indoor demand.

[0003] Because the heat exchangers in existing air conditioners use a fixed flow path, they cannot meet the heat exchange requirements of different air conditioner needs, resulting in poor user experience and other technical problems. Therefore, this invention studies and designs an air conditioning system, an air conditioner, and a control method. Summary of the Invention

[0004] Therefore, the present invention provides an air conditioning system, an air conditioner, and a control method, which can solve the technical problem in the prior art where the heat exchanger uses a fixed flow path and cannot meet the heat exchange requirements of different air conditioners, resulting in a poor user experience.

[0005] To address the aforementioned problems, the present invention provides an air conditioning system comprising: a compressor, a four-way valve, an outdoor heat exchanger, an electronic expansion valve, and an indoor heat exchanger, wherein the compressor, the four-way valve, the outdoor heat exchanger, the electronic expansion valve, and the indoor heat exchanger are connected to form an air conditioning circulation loop. The indoor heat exchanger includes multiple sets of heat exchange tubes, and the indoor heat exchanger can select the connection mode of the multiple sets of heat exchange tubes according to the mode of the air conditioner.

[0006] In some implementations, when the air conditioner is in cooling mode, multiple sets of heat exchange tubes are connected in parallel; when the air conditioner is in cooling mode, multiple sets of heat exchange tubes are connected in series.

[0007] In some embodiments, the multiple sets of heat exchange tubes include a first set of heat exchange tubes, a second set of heat exchange tubes, a third set of heat exchange tubes, a fourth set of heat exchange tubes, a fifth set of heat exchange tubes, and a sixth set of heat exchange tubes; the first set of heat exchange tubes includes a first connection port A1 and a second connection port D1, the second set of heat exchange tubes includes a third connection port B1 and a fourth connection port E1, the third set of heat exchange tubes includes a fifth connection port C1 and a sixth connection port F1, the fourth set of heat exchange tubes includes a seventh connection port A2 and an eighth connection port D2, the fifth set of heat exchange tubes includes a ninth connection port B2 and a tenth connection port E2, and the sixth set of heat exchange tubes includes an eleventh connection port C2 and a twelfth connection port F2.

[0008] In some embodiments, the indoor heat exchanger includes an inlet and an outlet. The inlet is connected to the electronic expansion valve. The second connection port D1, the fourth connection port E1, and the sixth connection port F1 are connected through a second branch. The outlet is connected to a first branch, one end of which is connected to the outlet, and the other end of which is connected to the second branch. The eighth connection port D2, the tenth connection port E2, and the twelfth connection port F2 are connected through a third branch. The third branch is connected to the first branch. A solenoid valve C is installed on the first branch. The third branch and the first branch have a first connection point. The solenoid valve C is located between the first connection point and the second branch. The first connection port A1, the third connection port B1, the fifth connection port C1, the seventh connection port A2, the ninth connection port B2, and the eleventh connection port C2 are connected to the four-way valve.

[0009] In some embodiments, the four-way valve is connected to the indoor heat exchanger via an eighth branch; one end of the eighth branch is connected to the four-way valve, and the other end of the eighth branch is connected to a fourth branch. The first connection port A1, the third connection port B1, and the fifth connection port C1 are connected through the fifth branch; the seventh connection port A2, the ninth connection port B2, and the eleventh connection port C2 are connected through the seventh branch, and the second branch is connected to the seventh branch through the sixth branch, and a solenoid valve B is provided on the sixth branch; The fifth branch and the seventh branch are connected to the fourth branch. A solenoid valve A is installed on the fourth branch. The fifth branch and the fourth branch have a second connection point. The seventh branch and the fourth branch have a third connection point. The solenoid valve A is located between the second connection point and the third connection point.

[0010] In some embodiments, a temperature sensor A and a pressure sensor are provided on the eighth branch, a temperature sensor C is provided indoors, a temperature sensor B is provided on the connecting pipe between the inlet and the electronic expansion valve, and the compressor, the electronic expansion valve, the temperature sensor A, the temperature sensor B, the temperature sensor C and the pressure sensor are all connected to the control module.

[0011] The present invention also provides an air conditioner, including the air conditioning system described above.

[0012] The present invention also provides a control method for the above-mentioned air conditioner, which is implemented according to the following steps; When the four-way valve is connected to the indoor heat exchanger through the eighth branch; Judgment steps: Determine the operating mode of the air conditioner; Control steps: When the air conditioner is in cooling mode, control solenoid valve B to close and solenoid valves A and C to open; when the air conditioner is in heating mode, control solenoid valve B to open and solenoid valves A and C to close.

[0013] In some implementations, when the air conditioner is in heating mode, the following step is further included: the air conditioner runs continuously for time t1. The judgment steps involve determining the change in outlet air temperature ΔT3 and the deviation value T of the first preset temperature change. A The relationship between them; Control steps: When |ΔT3| ≤ T A When |ΔT3| > T, the air conditioning unit is considered to be in a stable state; A At that time, continue to judge the change value of the outlet air temperature ΔT3 and the deviation value of the first preset temperature T. A The relationship between them.

[0014] In some implementations, when |ΔT3| ≤ T A The process also includes the following steps: The judgment step is to determine the outlet air temperature value T. 3、 User-defined temperature value T 设定 Second preset temperature change deviation value T B The relationship between them; Control steps, when |T3-T 设定 |>T B Then, continue to determine whether T is satisfied. B + T 设定 <T3; When T is satisfied B + T 设定 When T < T3, the solenoid valve C is opened, and the solenoid valves A and B are closed; when T is not satisfied... B + T设定 When <T3, keep solenoid valve B open, and solenoid valve A and solenoid valve C closed.

[0015] In some implementations, when |T3-T 设定 |≤T B The process also includes the following steps: when a temperature sensor A and a pressure sensor are installed on the eighth branch, The decision step is to determine whether Q ≤ Q. A , where Q A As a preset value, Q = f(F, T1, T2, K, P), where F is the frequency of the compressor, T1 is the real-time temperature of the temperature sensing bulb A, T2 is the real-time temperature of the temperature sensing bulb B, K is the opening degree of the electronic expansion valve, and P is the real-time pressure of the pressure sensor. Control steps, when Q≤Q A At that time, maintain the current state.

[0016] In some implementations, when Q≤QA is satisfied, the following step is also included: after the air conditioner has been running for time t2; The decision step is to determine whether F ≤ F A FA is the set compressor frequency, and F is the real-time compressor frequency. Control steps; when F ≤ F A If the current state is maintained, after time t2, it is determined whether F≤FA is satisfied. If the condition is not satisfied, the solenoid valves A and C are closed, and the solenoid valve B is opened. At the same time, the built-in parameter Q is updated. A =Q, until the continuous time interval t1 |ΔT3| ≤ T is satisfied again. A .

[0017] The air conditioning system, air conditioner, and control method provided by this invention have the following beneficial effects: By using different connection methods between multiple sets of heat exchange tubes, different flow paths of indoor heat exchangers can be achieved, thereby adjusting the flow path within the indoor heat exchanger to meet the heat exchange requirements of the indoor heat exchanger under different air conditioner modes, achieving the best heat exchange effect, and avoiding situations where the minimum output capacity of the unit is still higher than the indoor demand due to the large unit selection, which affects the user's comfort. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the air conditioning system of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the air conditioning system of the present invention. Figure 2 ; Figure 3 This is a control flowchart of an air conditioner control method according to another embodiment of the present invention.

[0020] The attached figures are labeled as follows: 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 4. Outdoor fan; 5. Electronic expansion valve; 6. Indoor heat exchanger; 7. Indoor fan; 8. Solenoid valve A; 9. Solenoid valve B; 10. Solenoid valve C; 11. Temperature sensor A; 12. Temperature sensor B; 13. Temperature sensor C; 14. Control module; 15. Pressure sensor; 16. Third branch; 17. Second branch; 18. First branch; 19. Fourth branch; 20. Fifth branch; 21. Sixth branch; 22. Seventh branch; 23. Eighth branch. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0023] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0025] See also Figure 1-3 As shown, according to an embodiment of the present invention, an air conditioning system is provided, including: a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 5, and an indoor heat exchanger 6, wherein the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the electronic expansion valve 5, and the indoor heat exchanger 6 are connected to form an air conditioning circulation loop; The indoor heat exchanger 6 includes multiple sets of heat exchange tubes, and the indoor heat exchanger 6 can select the connection mode of the multiple sets of heat exchange tubes according to the mode of the air conditioner.

[0026] In this technical solution, the different connection methods between the multiple sets of heat exchange tubes can realize different flow paths of the indoor heat exchanger 6, thereby adjusting the path of the flow path in the indoor heat exchanger 6 to meet the heat exchange requirements of the indoor heat exchanger 6 under different air conditioner modes, achieve the best heat exchange effect, and avoid the situation where the minimum output capacity of the unit is still higher than the indoor demand due to the large selection of the unit, which affects the user's comfort.

[0027] In some embodiments, an outdoor heat exchanger 3 is provided with an outdoor fan 4, and an indoor heat exchanger 6 is provided with an indoor fan 7.

[0028] In some implementations, when the air conditioner is in cooling mode, multiple sets of heat exchange tubes are connected in parallel; when the air conditioner is in cooling mode, multiple sets of heat exchange tubes are connected in series.

[0029] In this technical solution, when the air conditioner is in cooling mode, multiple sets of heat exchange tubes are connected in parallel. With multiple sets of heat exchange tubes connected in parallel, multiple sets of refrigerant flow in parallel, which significantly improves the refrigerant subcooling effect in the indoor heat exchanger 6. When the air conditioner is in heating mode, multiple sets of heat exchange tubes are connected in series, and the refrigerant path in the indoor heat exchanger 6 is multiple, which significantly improves the heat exchange effect of the heat exchanger.

[0030] In some embodiments, the multiple sets of heat exchange tubes include a first set of heat exchange tubes, a second set of heat exchange tubes, a third set of heat exchange tubes, a fourth set of heat exchange tubes, a fifth set of heat exchange tubes, and a sixth set of heat exchange tubes; the first set of heat exchange tubes includes a first connection port A1 and a second connection port D1, the second set of heat exchange tubes includes a third connection port B1 and a fourth connection port E1, the third set of heat exchange tubes includes a fifth connection port C1 and a sixth connection port F1, the fourth set of heat exchange tubes includes a seventh connection port A2 and an eighth connection port D2, the fifth set of heat exchange tubes includes a ninth connection port B2 and a tenth connection port E2, and the sixth set of heat exchange tubes includes an eleventh connection port C2 and a twelfth connection port F2.

[0031] In this technical solution, the multiple sets of heat exchange tubes consist of a first set of heat exchange tubes, a second set of heat exchange tubes, a third set of heat exchange tubes, a fourth set of heat exchange tubes, a fifth set of heat exchange tubes, and a sixth set of heat exchange tubes. Adjusting the connection relationship between the first set of heat exchange tubes, the second set of heat exchange tubes, the third set of heat exchange tubes, the fourth set of heat exchange tubes, the fifth set of heat exchange tubes, and the sixth set of heat exchange tubes can meet the needs of different modes of the air conditioner, thereby improving the user experience. Furthermore, the air conditioning system of the present invention is not limited to setting 6 sets of heat exchange tubes; the number of heat exchange tubes can be adjusted according to actual needs.

[0032] In some embodiments, the indoor heat exchanger 6 includes an inlet and an outlet. The inlet is connected to the electronic expansion valve 5. The second connection port D1, the fourth connection port E1, and the sixth connection port F1 are connected through a second branch 17. The outlet is connected to a first branch 18, one end of which is connected to the outlet, and the other end of which is connected to the second branch 17. The eighth connection port D2, the tenth connection port E2, and the twelfth connection port F2 are connected through a third branch 16. The third branch 16 is connected to the first branch 18. A solenoid valve C10 is provided on the first branch. The third branch 16 and the first branch 18 have a first connection point. The solenoid valve C10 is located between the first connection point and the second branch 17. The first connection port A1, the third connection port B1, the fifth connection port C1, the seventh connection port A2, the ninth connection port B2, and the eleventh connection port C2 are connected to the four-way valve 2.

[0033] In some embodiments, the four-way valve 2 is connected to the indoor heat exchanger 6 via an eighth branch 23; one end of the eighth branch 23 is connected to the four-way valve 2, and the other end of the eighth branch 23 is connected to a fourth branch 19. The first connection port A1, the third connection port B1, and the fifth connection port C1 are connected through the fifth branch 20; the seventh connection port A2, the ninth connection port B2, and the eleventh connection port C2 are connected through the seventh branch 22; the second branch 17 is connected to the seventh branch 22 through the sixth branch 21; and a solenoid valve B9 is provided on the sixth branch 21. The fifth branch 20 and the seventh branch 22 are connected to the fourth branch 19. A solenoid valve A8 is provided on the fourth branch 19. The fifth branch 20 and the fourth branch 19 have a second connection point, and the seventh branch 22 and the fourth branch 19 have a third connection point. The solenoid valve A8 is located between the second connection point and the third connection point.

[0034] In this technical solution, the series and parallel relationships between multiple heat exchange tubes can be adjusted through solenoid valves A8, B9, and C10. This allows for the adjustment of heating and cooling based on the operating status of the air conditioner. Different heat exchanger flow paths can be achieved by adjusting the switching of the solenoid valves, thus enabling the air conditioner to achieve optimal operating performance.

[0035] In some embodiments, a temperature sensor A11 and a pressure sensor 15 are provided on the eighth branch 23, a temperature sensor C13 is provided indoors, a temperature sensor B12 is provided on the connecting pipe between the inlet and the electronic expansion valve 5, and the compressor 1, the electronic expansion valve 5, the temperature sensor A11, the temperature sensor B12, the temperature sensor C13 and the pressure sensor 15 are all connected to the control module 14.

[0036] In this technical solution, the temperature sensing element A11, temperature sensing element B12, temperature sensing element C13 and pressure sensor 15 are used to detect the status of the air conditioning system in real time. The control module 14 judges the status of the air conditioning system and then adjusts the flow path in the indoor heat exchanger 6.

[0037] The air conditioning system of the present invention can solve the problems that the fixed heat exchanger flow path cannot achieve the best heat exchange effect in the cooling and heating modes, and that the fixed heat exchanger flow path cannot be adjusted according to the indoor capacity requirements to achieve the best heat exchange effect.

[0038] The air conditioning system of this invention uses solenoid valves to control the flow path in different modes of cooling and heating, thereby achieving optimal heat exchange performance in each mode. In heating mode, the flow path of the indoor heat exchanger is adjusted by controlling the solenoid valves to achieve optimal heat exchange performance under different capacities.

[0039] The air conditioning system of this invention consists of a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an outdoor fan 4, an electronic expansion valve 5, an indoor heat exchanger 6, an indoor fan 7, and solenoid valves A8, B9, and C10. Solenoid valves A, B, and C can adjust their on / off states according to the indoor load and operating mode. Temperature sensors A11, B12, and C13 are located at the air collection pipe, liquid collection pipe, and air outlet of the indoor heat exchanger 6, respectively, and are used to detect the temperatures T1, T2, and T3 at their corresponding locations. Pressure sensor 15 is a pressure sensor located on the air pipe, used to detect the pressure value P1. Control module 14 is a control module connected to temperature sensors A11, B12, and C13, pressure sensor 15, compressor 1, and electronic expansion valve 5, and can acquire and calculate the real-time temperatures T1, T2, and T3, pressure P, compressor frequency F, and electronic expansion valve opening K.

[0040] It should be noted that the control module 14 in the air conditioning system of the present invention is the control module in the air conditioner, and no additional controller is required.

[0041] The present invention also provides an air conditioner, including the air conditioning system described above.

[0042] The present invention also provides a control method for the above-mentioned air conditioner, which is implemented according to the following steps; When the four-way valve 2 is connected to the indoor heat exchanger 6 through the eighth branch 23; Judgment steps: Determine the operating mode of the air conditioner; Control steps: When the air conditioner is in cooling mode, control solenoid valve B9 to close and solenoid valves A8 and C10 to open; when the air conditioner is in heating mode, control solenoid valve B9 to open and solenoid valves A8 and C10 to close.

[0043] In this technical solution, during cooling mode, the indoor heat exchanger acts as an evaporator. The heat exchanger flow path is controlled in parallel to achieve optimal heat exchange performance. At this time, solenoid valve B is closed, while solenoid valves A and C are open. The refrigerant, throttled by the electronic expansion valve, exchanges heat with the indoor system through the parallel flow path composed of 2F-2C, 2E-2B, 2D-2A, 1F-1C, 1E-1B, and 1D-1A, and then returns to compressor 1 via four-way valve 2.

[0044] In heating mode, the indoor heat exchanger acts as a condenser, and the default flow path is in series. At this time, control solenoid valves A and C are closed, and solenoid valve B is open. The high-pressure gas compressed by the compressor passes through the four-way valve and flows into the indoor heat exchanger from 1A, 1B, and 1C for heat exchange. After heat exchange, it becomes a medium-pressure, medium-temperature gas-liquid mixture and flows out from 1D, 1E, and 1F. It then passes through solenoid valve B and undergoes heat exchange again from heat exchangers 2A, 2B, and 2C. After heat exchange, it flows out from 2D, 2E, and 2F, and then flows out after being subcooled in the subcooling section.

[0045] In some implementations, when the air conditioner is in heating mode, the following step is further included: the air conditioner runs continuously for time t1. The judgment steps involve determining the change in outlet air temperature ΔT3 and the deviation value T of the first preset temperature change. A The relationship between them; Control steps: When |ΔT3| ≤ T A When |ΔT3| > T, the air conditioning unit is considered to be in a stable state; A At that time, continue to judge the change value of the outlet air temperature ΔT3 and the deviation value of the first preset temperature T. A The relationship between them.

[0046] In this technical solution, t1 is preferably 30 minutes, and the temperature change deviation value T of the first preset temperature is... A The preferred temperature is 1℃. In heating mode, if the air conditioner continuously detects |ΔT3| ≤ T for a time t1, A It is assumed that the unit's state has stabilized. If the condition of continuous time t1 |ΔT3| ≤ T is not met, then... A If the condition is unstable, the unit is considered to be in an unstable state, and testing continues.

[0047] In some implementations, when |ΔT3| ≤ T A The process also includes the following steps: The judgment step is to determine the outlet air temperature value T. 3、 User-defined temperature value T 设定 Second preset temperature change deviation value T B The relationship between them; Control steps, when |T3-T 设定 |>T B Then, continue to determine whether T is satisfied. B + T 设定 <T3; When T is satisfied B + T 设定 When T < T3, the solenoid valve C10 is opened, and the solenoid valves A8 and B9 are closed; when T is not met... B + T 设定When <T3, keep solenoid valve B9 open, and solenoid valves A8 and C10 closed.

[0048] In this technical solution, when |ΔT3| ≤ T A Continue to check if |T3-T is satisfied. 设定 |≤T B If the detection does not meet |T3-T 设定 |≤T B Then continue to determine whether T is satisfied. B + T 设定 If the condition <T3 is met, the outlet air temperature will be much higher than the set temperature. This will close solenoid valves A and B, and open solenoid valve C, reducing the heat exchange efficiency of the indoor heat exchanger 6 and thus lowering the outlet air temperature. If this condition is not met, the outlet air temperature will not be higher than the set temperature, and solenoid valves A and C will remain closed, while solenoid valve B will remain open. The current state will be maintained.

[0049] In some implementations, when |T3-T 设定 |≤T B The process also includes the following steps: when a temperature sensor A11 and a pressure sensor 15 are installed on the eighth branch 23, The decision step is to determine whether Q ≤ Q. A , where Q A As a preset value, Q=fF, T1, T2, K, P, F is the frequency of the compressor 1, T1 is the real-time temperature of the temperature sensing bulb A11, T2 is the real-time temperature of the temperature sensing bulb B12, K is the opening degree of the electronic expansion valve 5, and P is the real-time pressure of the pressure sensor 15. Control steps, when Q≤Q A At that time, maintain the current state.

[0050] In this technical solution, if |T3-T is satisfied 设定 |≤T B If the condition is not met, the air conditioner will not be under load and will maintain the current solenoid valve state.

[0051] In some implementations, when Q≤QA is satisfied, the following step is also included: after the air conditioner has been running for time t2; The decision step is to determine whether F ≤ F A FA is the set compressor frequency, and F is the real-time compressor frequency. Control steps; when F ≤ F AIf the current state is maintained, after time t2, it is determined whether F≤FA is satisfied. If the condition is not satisfied, the solenoid valves A8 and C10 are closed, and the solenoid valve B9 is opened. At the same time, the built-in parameter Q is updated. A =Q, until the continuous time interval t1 |ΔT3| ≤ T is satisfied again. A .

[0052] In this technical solution, when Q≤QA is satisfied, the air conditioner operates under load, controlling solenoid valves A and B to close and solenoid valve C to open, reducing the heat exchange efficiency of indoor heat exchanger 6. At this time, the high-pressure gas compressed by the compressor passes through the four-way valve and flows into the indoor heat exchanger from 1A, 1B, and 1C for heat exchange. After heat exchange, it becomes a medium-pressure, medium-temperature gas-liquid mixture and flows out from 1D, 1E, and 1F. It no longer passes through solenoid valve B and undergoes heat exchange again in heat exchangers 2A, 2B, and 2C, but directly passes through solenoid valve C, undergoes subcooling in the subcooling section, and then flows out. After time t2, it continues to determine whether F≤F is satisfied. A F A To set the compressor frequency and prevent it from being too high, if this condition is met, the current solenoid valve state is maintained. After time t2, the system continues to check whether F≤F is satisfied. A If this condition is not met, control solenoid valves A and C to close, and solenoid valve B to open. Simultaneously, update the built-in parameter QA=Q until the condition is met again for continuous time t1 |ΔT3| ≤ T. A t2 is preferably 30 minutes, F A The preferred frequency is 65Hz.

[0053] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: include: The compressor (1), the four-way valve (2), the outdoor heat exchanger (3), the electronic expansion valve (5), and the indoor heat exchanger (6) are connected to form an air conditioning circulation loop. The indoor heat exchanger (6) includes multiple sets of heat exchange tubes, and the indoor heat exchanger (6) can select the connection mode of the multiple sets of heat exchange tubes according to the mode of the air conditioner.

2. The air conditioning system according to claim 1, characterized in that: When the air conditioner is in cooling mode, multiple sets of heat exchange tubes are connected in parallel; when the air conditioner is in cooling mode, multiple sets of heat exchange tubes are connected in series.

3. The air conditioning system according to claim 1, characterized in that: The multiple sets of heat exchange tubes include a first set of heat exchange tubes, a second set of heat exchange tubes, a third set of heat exchange tubes, a fourth set of heat exchange tubes, a fifth set of heat exchange tubes, and a sixth set of heat exchange tubes; the first set of heat exchange tubes includes a first connection port A1 and a second connection port D1, the second set of heat exchange tubes includes a third connection port B1 and a fourth connection port E1, the third set of heat exchange tubes includes a fifth connection port C1 and a sixth connection port F1, the fourth set of heat exchange tubes includes a seventh connection port A2 and an eighth connection port D2, the fifth set of heat exchange tubes includes a ninth connection port B2 and a tenth connection port E2, and the sixth set of heat exchange tubes includes an eleventh connection port C2 and a twelfth connection port F2.

4. The air conditioning system according to claim 3, characterized in that: The indoor heat exchanger (6) includes an inlet and an outlet. The inlet is connected to the electronic expansion valve (5). The second connection port D1, the fourth connection port E1, and the sixth connection port F1 are connected through a second branch (17). The outlet is connected to a first branch (18). One end of the first branch (18) is connected to the outlet, and the other end of the first branch (18) is connected to the second branch (17). The eighth connection port D2, the tenth connection port E2, and the twelfth connection port F2 are connected through a third branch (16). The third branch (16) is connected to the first branch (18). A solenoid valve C (10) is provided on the first branch. The third branch (16) and the first branch (18) have a first connection point. The solenoid valve C (10) is located between the first connection point and the second branch (17). The first connection port A1, the third connection port B1, the fifth connection port C1, the seventh connection port A2, the ninth connection port B2, and the eleventh connection port C2 are connected to the four-way valve (2).

5. The air conditioning system according to claim 4, characterized in that: The four-way valve (2) is connected to the indoor heat exchanger (6) through the eighth branch (23); one end of the eighth branch (23) is connected to the four-way valve (2), and the other end of the eighth branch (23) is connected to the fourth branch (19). The first connection port A1, the third connection port B1, and the fifth connection port C1 are connected through the fifth branch (20); the seventh connection port A2, the ninth connection port B2, and the eleventh connection port C2 are connected through the seventh branch (22); the second branch (17) is connected to the seventh branch (22) through the sixth branch (21); and a solenoid valve B (9) is provided on the sixth branch (21). The fifth branch (20) and the seventh branch (22) are connected to the fourth branch (19). The fourth branch (19) is equipped with a solenoid valve A (8). The fifth branch (20) and the fourth branch (19) have a second connection point, and the seventh branch (22) and the fourth branch (19) have a third connection point. The solenoid valve A (8) is located between the second connection point and the third connection point.

6. The air conditioning system according to claim 5, characterized in that: The eighth branch (23) is equipped with a temperature sensor A (11) and a pressure sensor (15), and a temperature sensor C (13) is installed indoors. A temperature sensor B (12) is installed on the connecting pipe between the inlet and the electronic expansion valve (5). The compressor (1), the electronic expansion valve (5), the temperature sensor A (11), the temperature sensor B (12), the temperature sensor C (13) and the pressure sensor (15) are all connected to the control module (14).

7. An air conditioner, characterized in that, The air conditioning system included in any one of claims 1 to 6.

8. The control method for an air conditioner according to claim 7, characterized in that: The specific steps are as follows: When the four-way valve (2) is connected to the indoor heat exchanger (6) through the eighth branch (23); Judgment steps: Determine the operating mode of the air conditioner; Control steps: When the air conditioner is in cooling mode, control the solenoid valve B (9) to close and the solenoid valve A (8) and the solenoid valve C (10) to open; when the air conditioner is in heating mode, control the solenoid valve B (9) to open and the solenoid valve A (8) and the solenoid valve C (10) to close.

9. The control method for an air conditioner according to claim 8, characterized in that: When the air conditioner is in heating mode, the following step is also included: when the air conditioner runs continuously for time t1; The judgment steps involve determining the change in outlet air temperature ΔT3 and the deviation value T of the first preset temperature change. A The relationship between them; Control steps: When |ΔT3| ≤ T A When |ΔT3| > T, the air conditioning unit is considered to be in a stable state; A At that time, continue to judge the change value of the outlet air temperature ΔT3 and the deviation value of the first preset temperature T. A The relationship between them.

10. The control method for an air conditioner according to claim 9, characterized in that: When |ΔT3|≤T A The process also includes the following steps: The judgment step is to determine the outlet air temperature value T. 3、 User-defined temperature value T 设定 Second preset temperature change deviation value T B The relationship between them; Control steps, when |T3-T 设定 |>T B Then, continue to determine whether T is satisfied. B + T 设定 <T3; When T is satisfied B + T 设定 When T < T3, the solenoid valve C (10) is opened, and the solenoid valves A (8) and B (9) are closed; when T is not met... B + T 设定 When <T3, keep the solenoid valve B (9) open, and the solenoid valve A (8) and the solenoid valve C (10) closed.

11. The control method for an air conditioner according to claim 10, characterized in that: When | T3-T 设定 |≤T B The process also includes the following steps: when a temperature sensor A (11) and a pressure sensor (15) are installed on the eighth branch (23), The decision step is to determine whether Q ≤ Q. A , where Q A As a preset value, Q=f(F,T1,T2,K,P), where F is the frequency of the compressor (1), T1 is the real-time temperature of the temperature sensing bulb A (11), T2 is the real-time temperature of the temperature sensing bulb B (12), K is the opening degree of the electronic expansion valve (5), and P is the real-time pressure of the pressure sensor (15). Control steps, when Q≤Q A At that time, maintain the current state.

12. The control method for an air conditioner according to claim 10, characterized in that: When Q≤QA is satisfied, the following step is also included: after the air conditioner has been running for time t2; The decision step is to determine whether F ≤ F A FA is the set compressor frequency, and F is the real-time compressor frequency. Control steps; when F ≤ F A If the current state is maintained, after time t2, it is determined whether F≤FA is satisfied. If the condition is not satisfied, the solenoid valves A (8) and C (10) are closed, and the solenoid valve B (9) is opened. At the same time, the built-in parameter Q is updated. A =Q, until the continuous time interval t1 |ΔT3| ≤ T is satisfied again. A .

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