CN111503824B

CN111503824B - Control method of air conditioning system and air conditioning system

Info

Publication number: CN111503824B
Application number: CN202010353786.0A
Authority: CN
Inventors: 黎辉玲; 杜顺开; 谭周衡; 曾小朗
Original assignee: GD Midea Air Conditioning Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2022-06-17
Anticipated expiration: 2040-04-29
Also published as: CN111503824A

Abstract

The invention discloses a control method of an air conditioning system and the air conditioning system with the same, the air conditioning system comprises a compressor, an indoor heat exchanger, an indoor throttling device, an outdoor heat exchanger, a first bypass pipeline, a heater and a control assembly, the first bypass pipeline is connected with the indoor throttling device in parallel, the heater is suitable for heating a refrigerant between the outdoor heat exchanger and the compressor, the control method comprises a defrosting mode of operation, and the defrosting mode comprises the following steps: and the air conditioning system is in heating operation, the first bypass pipeline is communicated, the heater heats a refrigerant between the outdoor heat exchanger and the compressor, and the rotating speed P of the indoor fan is adjusted according to at least one of the indoor temperature T1, the temperature T2 of the indoor heat exchanger and the difference value between the outdoor heat exchanger T2 and the indoor temperature T1, wherein the rotating speed P of the indoor fan is positively correlated with any one of the indoor temperature T1, the temperature T2 of the indoor heat exchanger and the difference value between the outdoor heat exchanger T2 and the indoor temperature T1. The control method of the invention can effectively shorten the defrosting time of the air conditioning system.

Description

Control method of air conditioning system and air conditioning system

Technical Field

The invention relates to the technical field of air conditioning, in particular to a control method of an air conditioning system and the air conditioning system.

Background

It is known that most outdoor heat exchangers of air conditioning systems frost during winter heating. As the amount of frost increases, the heating capacity of the air conditioning system decreases greatly, and the comfort in the room decreases, so that the air conditioning system needs to be defrosted. However, in the related art, the defrosting time of the air conditioning system is long.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a control method for an air conditioning system, which can effectively shorten the defrosting time of the air conditioning system.

The invention further provides an air conditioning system.

According to the control method of the air conditioning system provided by the embodiment of the invention, the air conditioning system comprises a compressor, an indoor heat exchanger, an indoor fan, an indoor throttling device, an outdoor heat exchanger, an outdoor fan, a first bypass pipeline, a heater and a control assembly, wherein the first bypass pipeline is connected with the indoor throttling device in parallel, the heater is suitable for heating a refrigerant between the outdoor heat exchanger and the compressor, the control method comprises a defrosting mode of operation, and the defrosting mode comprises the following steps: the air conditioning system is in heating operation, the first bypass pipeline is communicated, the heater heats a refrigerant between the outdoor heat exchanger and the compressor, and the rotating speed P of the indoor fan is adjusted according to at least one of indoor temperature T1, indoor heat exchanger temperature T2 and the difference value between indoor heat exchanger temperature T2 and indoor temperature T1, wherein the rotating speed P of the indoor fan is positively correlated with the indoor temperature T1; the indoor fan rotating speed P is positively correlated with the indoor heat exchanger temperature T2; the indoor fan rotating speed P is positively correlated with the difference between the indoor heat exchanger temperature T2 and the indoor temperature T1.

According to the control method of the air conditioning system, the diversity and the flexibility of the operation defrosting mode of the air conditioning system are improved. The defrosting time of the air conditioning system can be effectively shortened, so that the air conditioning system can quickly return to the heating mode from the defrosting mode.

According to some embodiments of the invention, the defrost mode comprises: the indoor temperature T1 is obtained, the indoor temperature T1 is compared with a first set temperature T0, and when the temperature T1 is more than or equal to T0, the air conditioning system enters a first operation mode; when T1 < T0, the air conditioning system enters a second operation mode; in the first operation mode, P ═ Pmin + T1 ═ Pmax-Pmin)/Tmax, where Pmin is the minimum value of the indoor fan rotational speed, Pmax is the maximum value of the indoor fan rotational speed, and Tmax is the maximum value that can be reached by the indoor temperature; and in the second operation mode, the indoor fan is turned off.

In some embodiments of the invention, T0 is between 5 ℃ and 25 ℃, Pmin is between 100r/s and 800r/s, Pmax is between 800r/s and 2000r/s, and Tmax is between 5 ℃ and 25 ℃.

According to some embodiments of the invention, the defrost mode comprises: obtaining the temperature T2 of the indoor heat exchanger, and comparing the temperature T2 with a second set temperature T20 and a third set temperature T21, wherein T21 is less than T20, and when T2 is more than or equal to T20, the air conditioning system enters a third operation mode; when T21 is more than or equal to T2 is more than T20, the air conditioning system enters a fourth operation mode; when T2 < T21, the air conditioning system enters a fifth operation mode; in the third operation mode, the rotating speed of the indoor fan is unchanged; in the fourth operation mode, the rotating speed P1 of the indoor fan is controlled to be reduced by a preset rotating speed delta P, and then the rotating speed P of the indoor fan is reduced by the preset rotating speed delta P every t time until the rotating speed P of the indoor fan is reduced to the minimum value; and in the fifth operation mode, the indoor fan is turned off.

In some embodiments of the invention, T20 is from 40 ℃ to 55 ℃, T21 is from 25 ℃ to 40 ℃, Δ P is from 1r/s to 50r/s, and T is from 1s to 10 s.

According to some embodiments of the invention, the defrost mode comprises: acquiring the indoor temperature T1 and the temperature T2 of the indoor heat exchanger, comparing T2-T1 with a fourth set temperature delta T, and when T2-T1 is larger than or equal to the delta T, enabling the air conditioning system to enter a sixth operation mode; when T2-T1 <. DELTA.T, the air conditioning system enters a seventh operating mode; in the sixth operation mode, the rotating speed of the indoor fan is controlled to be reduced to a preset value; and in the seventh operation mode, the indoor fan is turned off.

In some embodiments of the invention, Δ T is from 10 ℃ to 40 ℃.

In some embodiments of the invention, the preset value is a minimum value of the indoor fan rotation speed.

According to some embodiments of the invention, the defrost mode further comprises: and acquiring the indoor temperature T1 and/or the indoor heat exchanger temperature T2 every interval of first set time and adjusting the air conditioning system to enter different defrosting modes.

In some embodiments of the present invention, the first set time is in a range of 1s-120 s.

According to some embodiments of the present invention, the air conditioning system further comprises an electric auxiliary heat, the electric auxiliary heat being turned on in the first, third, fourth and sixth operation modes; in the second, fifth and seventh operating modes, the electric auxiliary heat is turned off.

In some embodiments of the invention, the defrost mode further comprises: adjusting a heating power of the electric auxiliary heat, which is inversely related to the indoor temperature T1, according to at least one of the indoor temperature T1, the indoor heat exchanger temperature T2, and a difference between the indoor heat exchanger temperature T2 and the indoor temperature T1; the heating power of the electric auxiliary heat is inversely related to the indoor heat exchanger temperature T2; the heating power of the electrically assisted heat is inversely related to the difference between the indoor heat exchanger temperature T2 and the indoor temperature T1.

According to some embodiments of the invention, the heater is a heat accumulator comprising a heating element, the heat accumulator being connected in parallel with a line between the outdoor heat exchanger and the return air port of the compressor.

In some embodiments of the invention, the control method comprises: acquiring the temperature T6 of the heat accumulator, comparing the temperature T6 with a fifth set temperature T61 and a sixth set temperature T62, wherein T61 is less than T62, and if T6 is less than or equal to T61, turning on the heating element; if T6 ≧ T62, the heating element is turned off.

In some embodiments of the invention, turning on the heating element also requires simultaneously: the temperature T3 of the outdoor heat exchanger outlet is less than the seventh set temperature T31.

In some embodiments of the invention, T61 is between 20 ℃ and 80 ℃ and T62 is between 50 ℃ and 150 ℃.

In some embodiments of the invention, the temperature T6 of the heat accumulator and/or the temperature T3 of the outlet of the outdoor heat exchanger are obtained and whether the heating element is turned on or not is adjusted every second set time.

According to some embodiments of the present invention, the inlet of the outdoor heat exchanger is provided with a first temperature sensor, the heater is provided with a second temperature sensor, and the control method further comprises: acquiring the states of the first temperature sensor and the second temperature sensor when defrosting is needed, and if at least one of the first temperature sensor and the second temperature sensor has a fault, performing refrigeration operation on the air conditioning system to defrost; and if the first temperature sensor and the second temperature sensor have no faults, operating the defrosting mode.

According to some embodiments of the present invention, the condition that the air conditioning system needs to operate the defrosting mode is:

the continuous heating time of the air conditioning system reaches a first preset time and meets the condition that T30-T5 is greater than or equal to a first preset temperature or T3 is lower than a second preset temperature, wherein T5 is the temperature of the inlet of the outdoor heat exchanger, T30 is the lowest temperature value of the outlet of the outdoor heat exchanger in a preset time before the current running state of the outdoor heat exchanger, and T3 is the temperature of the outlet of the outdoor heat exchanger.

In some embodiments of the present invention, the air conditioning system operates a defrosting mode when the air conditioning system satisfies one of the following entry conditions,

a1: the time for the air conditioning system to continuously execute the heating mode is greater than or equal to a first time value, and the time for the T3 to be continuously lower than the first temperature value is greater than or equal to a second time value;

a2: the time for the air conditioning system to continuously execute the heating mode is more than or equal to a third time value, and T30-T5 is more than or equal to a second temperature value;

a3: the time for the air conditioning system to continuously execute the heating mode is greater than or equal to a fourth time value, and T30-T5 is greater than or equal to a third temperature value;

a4: the time for the air conditioning system to continuously execute the heating mode is more than or equal to a fifth time value, and T30-T5 is more than or equal to a fourth temperature value;

a5: the accumulated running time of the compressor is more than or equal to a sixth time value, and T3 is less than or equal to a fifth temperature value;

the first time value, the third time value, the fourth time value, the fifth time value and the sixth time value are respectively corresponding first preset time in A1-A5, the first temperature value and the fifth temperature value are respectively corresponding second preset temperature in A1 and A5, and the second temperature value to the fourth temperature value are respectively corresponding first preset temperature in A2-A4.

In some embodiments of the invention, the first time value is 90min, the first temperature value is-3 ℃, and the second time value is 3 min; the third time value is 29min, and the second temperature value is 2.5 ℃; the fourth time value is 40min, and the third temperature value is 2.0 ℃; the fifth time value is 50min, and the fourth temperature value is 2.0 ℃; the sixth time value is 120min, and the fifth temperature value is-15 ℃.

In some embodiments of the present invention, in a1-a5, each condition also needs to be satisfied simultaneously: the temperature of the heater is greater than or equal to 60 ℃.

According to some embodiments of the present invention, when the air conditioning system satisfies one of the following end conditions, the air conditioning system exits the defrosting mode,

b1: t5 is greater than or equal to the sixth temperature value;

b2: t5 is greater than or equal to a seventh temperature value, the defrosting duration time reaches a second preset time, and the seventh temperature value is less than the sixth temperature value;

b3: the defrosting time lasts for a third preset time, and the third preset time is longer than the second preset time;

wherein T5 is the temperature of the outdoor heat exchanger inlet.

In some embodiments of the present invention, the sixth temperature value is 6 ℃, the seventh temperature value is 4 ℃, the second preset time is 40s, and the third preset time is 4 min.

According to the air conditioning system of the embodiment of the present invention, the air conditioning system controls defrosting by using the control method of the air conditioning system according to the above embodiment of the present invention, and the air conditioning system includes: the air conditioner comprises a compressor, a reversing device, an indoor heat exchanger, an indoor fan, an electric auxiliary heater, an outdoor heat exchanger, an outdoor fan, an indoor throttling device, a first bypass pipeline, a second bypass pipeline, a heater and a control assembly, wherein the reversing device is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is connected with an exhaust port of the compressor, the second valve port is connected with a gas return port of the compressor, the third valve port is connected with one end of the indoor heat exchanger, the other end of the indoor heat exchanger is connected with one end of the indoor throttling device, the fourth valve port is connected with one end of the outdoor heat exchanger, the other end of the outdoor heat exchanger is connected with the other end of the indoor throttling device, the reversing device switches the first valve port to be communicated with one of the third valve port and the fourth valve port, and the second valve port is communicated with the other of the third valve port and the fourth valve port, the first bypass pipeline is connected in parallel with a first pipeline where the indoor throttling device is located, the second bypass pipeline is connected in parallel with a second pipeline connected between the outdoor heat exchanger and the air return port, the heater is connected in series with the second bypass pipeline, the control component controls the on-off of the first bypass pipeline and the on-off of the second bypass pipeline, the air conditioning system has a defrosting mode, in the defrosting mode, the first bypass pipeline and the second bypass pipeline are respectively communicated, the first valve port is communicated with the third valve port, and the second valve port is communicated with the fourth valve port.

According to the air conditioning system provided by the embodiment of the invention, a heating mode and a cooling mode can be operated, and a defrosting mode without reversing and a reversing defrosting mode can be operated.

According to some embodiments of the present invention, the control assembly is further capable of adjusting the refrigerant flow distribution of the first bypass line and the first line, and/or adjusting the refrigerant flow distribution of the second bypass line and the second line.

In some embodiments of the invention, the control assembly includes a first control valve provided to the electric two-way valve on the first bypass line and a second control valve provided to the electric three-way valve in a position where the second bypass line and the second line branch in parallel or a position where they merge in parallel.

In some embodiments of the present invention, the heater is a heat accumulator, the heat accumulator includes a heat accumulation box, a heating element and a heat exchanger assembly, a heat accumulation medium is filled in the heat accumulation box, a placement space is defined in the heat accumulation box, the heating element and the heat exchanger assembly are both disposed in the placement space, and the refrigerant in the second bypass line flows through the heat exchanger assembly.

In some embodiments of the present invention, the heat accumulator further includes a limiting frame, the heat exchanger assembly includes a first heat exchanging portion and a second heat exchanging portion arranged in two rows, the limiting frame is located between the first heat exchanging portion and the second heat exchanging portion, and the heating element is disposed on the limiting frame.

In some embodiments of the present invention, the spacing frame comprises a first bracket and a second bracket, the first bracket and the second bracket are connected to define a spacing space, and the heating element is disposed in the spacing space to be spaced apart from the heat exchanger assembly.

In some embodiments of the invention, the heating element is a PTC.

In some embodiments of the present invention, the heating element is a magnetically permeable material, and the heat accumulator further comprises an electromagnetic element provided on the heat accumulation cartridge body to electromagnetically cooperate with the heating element.

In some embodiments of the present invention, the heating element is located at a middle lower portion of the placing space.

In some embodiments of the invention, the heat accumulator further comprises a buffer structure for buffering the pressure of the gas in the heat accumulation cartridge.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a system diagram of an air conditioning system while heating according to some embodiments of the present invention;

FIG. 2 is a system diagram of an air conditioning system while cooling according to some embodiments of the present invention;

FIG. 3 is a system diagram of an air conditioning system operating in a defrost mode according to some embodiments of the present invention;

FIG. 4 is a flow chart of an air conditioning system operating defrost mode according to some embodiments of the present invention;

FIG. 5 is a flow chart of an air conditioning system operating defrost mode according to some embodiments of the present invention;

FIG. 6 is a flow chart of an air conditioning system operating defrost mode according to some embodiments of the present invention;

FIG. 7 is a schematic view of a heater according to some embodiments of the invention;

FIG. 8 is an exploded view of a heater according to some embodiments of the invention;

fig. 9 is a cross-sectional view of a heater according to some embodiments of the invention.

Reference numerals:

100. an air conditioning system;

1. a compressor; 11. an exhaust port; 12. an air return port;

2. an indoor heat exchanger;

3. an indoor throttling device;

4. an outdoor heat exchanger;

5. a heater; 51. a heating element; 52. a heat storage cartridge; 53. a placement space;

54. a heat exchanger assembly; 541. a first heat exchange section; 542. a second heat exchange section;

55. a limiting frame; 551. a first bracket; 552. a second bracket; 553. a limiting space;

6. a control component; 61. a first control valve; 62. a second control valve;

7. a reversing device; 71. a first valve port; 72. a second valve port; 73. a third valve port; 74. a fourth valve port;

10. a first bypass line; 20. a second bypass line; 30. a first pipeline; 40. a second pipeline.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A control method of the air conditioning system 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings. As shown in fig. 1-3, the air conditioning system 100 includes a compressor 1, an indoor heat exchanger 2, an indoor fan, an indoor throttling device 3, an outdoor heat exchanger 4, an outdoor fan, a first bypass line 10, a heater 5, and a control component 6, where the first bypass line 10 is connected in parallel with the indoor throttling device 3, and the heater 5 is adapted to heat a refrigerant between the outdoor heat exchanger 4 and the compressor 1. In fig. 1 to 3, the unidirectional arrows indicate the flowing direction of the refrigerant.

It can be understood that, when the air conditioning system 100 operates in the normal heating mode, the refrigerant discharged from the compressor 1 may sequentially pass through the indoor heat exchanger 2, the indoor throttling device 3, and the outdoor heat exchanger 4, and finally flow back to the compressor 1. And the arrangement of the first bypass line 10 and the heater 5, may enable the air conditioning system 100 to defrost without reversing, that is, when defrosting is required after the air conditioning system 100 heats for a while, the first bypass line 10 may be connected such that the refrigerant flowing through the indoor heat exchanger 2 does not pass through the indoor throttling device 3 but directly flows to the outdoor heat exchanger 4 through the first bypass line 10 connected in parallel to the indoor throttling device 3, thereby forming both the indoor heat exchanger 2 and the outdoor heat exchanger 4 as condensers, so that the refrigerant can be condensed and released heat in the outdoor heat exchanger 4, thereby realizing the defrosting function of the air conditioning system 100 without reversing, the refrigerant after condensing and releasing heat is formed into liquid, the liquid refrigerant can then be heated by the heater 5 as it flows to the return port 12 of the compressor 1, and then evaporated into a gaseous state to flow back to the compressor 1, thereby realizing the function of non-reversing defrosting of the air conditioning system 100. Meanwhile, the indoor temperature is relatively stable, and the comfort of the user using the air conditioning system 100 is improved.

As shown in fig. 4 to 6, the control method of the air conditioning system 100 according to the embodiment of the present invention includes operating a defrosting mode, which includes: the air conditioning system 100 is in heating operation, the first bypass pipeline 10 is connected, the heater 5 heats a refrigerant between the outdoor heat exchanger 4 and the compressor 1, and the indoor fan rotating speed P is adjusted according to at least one of the indoor temperature T1, the temperature T2 of the indoor heat exchanger 2 and the difference value between the temperature T2 of the indoor heat exchanger 2 and the indoor temperature T1.

The indoor fan rotating speed P is positively correlated with the indoor temperature T1; the indoor fan rotating speed P is positively correlated with the temperature T2 of the indoor heat exchanger 2; the indoor fan rotating speed P is positively correlated with the difference between the indoor heat exchanger 2 temperature T2 and the indoor temperature T1.

Therefore, the defrosting mode mentioned in the embodiment of the invention is non-reversing defrosting. The air conditioning system 100 according to the embodiment of the present invention may adjust the indoor fan rotation speed P to operate the defrosting mode through the indoor temperature T1. The indoor fan speed P may also be adjusted by the indoor heat exchanger 2 temperature T2 to operate the defrost mode. The indoor fan speed P may also be adjusted to operate the defrosting mode by the difference between the indoor heat exchanger 2 temperature T2 and the indoor temperature T1. Of course, the air conditioning system 100 may also adjust the indoor fan rotation speed P to operate the defrosting mode through any two or three of the indoor temperature T1, the indoor heat exchanger 2 temperature T2, and the difference between the indoor heat exchanger 2 temperature T2 and the indoor temperature T1. So that the air conditioning system 100 may adjust the rotation speed P of the indoor fan in various ways to operate the defrosting mode. The diversity and flexibility of the defrosting mode of the air conditioning system 100 are improved.

For example, if the rotation speed P of the indoor fan is adjusted by the indoor temperature T1, the temperature T2 of the indoor heat exchanger 2, and the difference between the temperature T2 of the indoor heat exchanger 2 and the indoor temperature T1, the rotation speed P1 of one indoor fan may be determined by T1, the rotation speed P2 of one indoor fan may be determined by T2, the rotation speed P3 of one indoor fan may be determined by T2-T1, and then the final rotation speed of the air conditioning system 100 in the defrosting mode may be determined by the average of the three rotation speeds. The maximum value or the minimum value of the three rotation speeds can be selected to determine the final rotation speed of the air conditioning system 100 in the defrosting mode. The final rotation speed of the air conditioning system 100 in the defrosting mode may also be calculated by substituting the three rotation speeds into a preset formula. Similarly, if the rotation speed of the indoor fan is determined according to any two of the indoor temperature T1, the temperature T2 of the indoor heat exchanger 2, and the difference between the temperature T2 of the indoor heat exchanger 2 and the indoor temperature T1, the determination method is the same as the determination method described above, and details are not repeated here.

Since the rotation speed P of the indoor fan is positively correlated to the difference between the indoor temperature T1, the temperature T2 of the indoor heat exchanger 2, and the temperature T2 and the indoor temperature T1 of the indoor heat exchanger 2, respectively, it can be understood that, when the values T1, T2, and T2-T1 are smaller, the rotation speed P of the indoor fan is relatively smaller, and can even be reduced to zero, that is, the indoor fan does not rotate. Therefore, when the air conditioning system 100 operates in the defrosting mode according to the embodiment of the present invention, if the values of T1, T2, and T2 to T1 are relatively large, the indoor fan rotates, and at this time, the air conditioning system 100 may still be used to exchange heat with the indoor space. If the values of T1, T2, and T2-T1 are relatively small, the rotating speed P of the indoor fan is relatively small and can even be reduced to zero. It is known that the heat of the refrigerant discharged from the compressor 1 is limited, so that the rotating speed P of the indoor fan is small or zero, and the heat exchange between the high-temperature and high-pressure refrigerant discharged from the compressor 1 and the indoor space can be effectively reduced or avoided, and most or all of the heat in the refrigerant can be released at the outdoor heat exchanger 4, thereby effectively shortening the defrosting time of the air conditioning system 100, and enabling the air conditioning system 100 to quickly return to the heating mode from the defrosting mode.

It is understood that, when the air conditioning system 100 operates in the defrosting mode (without reversing defrosting), the outdoor fan is always turned off, the compressor 1 operates, the exhaust port 11 of the compressor 1 is connected to the indoor heat exchanger 2, and the return port 12 of the compressor 1 is connected to the outdoor heat exchanger 4. And then the reliability that the air conditioning system 100 operates in the defrosting mode and does not need to be reversed is ensured.

According to the control method of the air conditioning system 100, the diversity and the flexibility of the defrosting mode of the air conditioning system 100 are improved. The defrosting time of the air conditioning system 100 can be effectively shortened, so that the air conditioning system 100 can quickly return to the heating mode from the defrosting mode.

As shown in fig. 4, according to some embodiments of the present invention, the defrosting mode includes: obtaining an indoor temperature T1, comparing the indoor temperature T1 with a first set temperature T0, and when T1 is more than or equal to T0, enabling the air conditioning system 100 to enter a first operation mode; when T1 < T0, the air conditioning system 100 enters a second operation mode; in the first operation mode, P is Pmin + T1 (Pmax-Pmin)/Tmax, where Pmin is the minimum value of the indoor fan rotation speed, Pmax is the maximum value of the indoor fan rotation speed, and Tmax is the maximum value that the indoor temperature can reach; in a second mode of operation, the indoor fan is turned off.

Therefore, in the control method of the air conditioning system 100 according to the embodiment of the present invention, when the air conditioning system 100 operates the defrosting mode, two modes may be used. And it can be known that the first operation mode and the second operation mode are selected according to the magnitude of comparing the indoor temperature with the first set temperature, that is, if T1 ≧ T0, the air conditioning system 100 enters the first operation mode, and the rotation speed P of the indoor fan is Pmin + T1 (Pmax-Pmin)/Tmax; if T1 < T0, then the air conditioning system 100 enters the second mode of operation and the indoor fan is turned off.

Therefore, when the indoor temperature is relatively high, the air conditioning system 100 defrosts by using the first operation mode, and at this time, although the rotating speed of the indoor fan is adjusted, the indoor fan still rotates, so that the air conditioning system 100 can still be used for exchanging heat for indoor replacement parts.

Meanwhile, the rotating speed P of the indoor fan is positively correlated with the indoor temperature T1, and the smaller the T1 is, the smaller the P value is. When T1 < T0 indicates that the indoor temperature is relatively low, the rotation speed P of the indoor fan may be reduced to zero, i.e., the indoor fan is turned off to enter the second operation mode for defrosting. It can be understood that, if the indoor temperature is relatively low, the indoor fan is still operated, and a part of the heat of the refrigerant discharged from the compressor 1 is used for defrosting at the outdoor heat exchanger 4, the heat of the refrigerant used for heating the indoor space is not much, so that even if the indoor fan rotates, the air blown out after heat exchange is still cool air which is uncomfortable for the user (for example, the indoor temperature is originally 3 ℃, the temperature after heat exchange is 8 ℃, and still cool air is still cool air, which is still uncomfortable for the user), and thus it can be known that the indoor fan is turned off to some extent, so that the cool air blown out from the air conditioning system 100 due to the relatively low indoor temperature can be avoided. Thereby being beneficial to improving the use experience of the user.

Meanwhile, it can be known that, when the indoor fan is turned off in the second operation mode, the heat exchange between the high-temperature and high-pressure refrigerant discharged from the compressor 1 and the indoor space can be effectively avoided, and further, all heat in the refrigerant can be released at the outdoor heat exchanger 4, so that the defrosting time of the air conditioning system 100 can be effectively shortened, and the air conditioning system 100 can quickly return to the heating mode from the defrosting mode.

In some embodiments of the invention, T0 is between 5 ℃ and 25 ℃, Pmin is between 100r/s and 800r/s, Pmax is between 800r/s and 2000r/s, and Tmax is between 5 ℃ and 25 ℃. Specifically, Pmin is 500r/s, Pmax is 1500 r/s.

As shown in fig. 5, according to some embodiments of the present invention, the defrosting mode includes: acquiring the temperature T2 of the indoor heat exchanger 2, and comparing the temperature T2 with a second set temperature T20 and a third set temperature T21, wherein T21 is less than T20, and when T2 is more than or equal to T20, the air-conditioning system 100 enters a third operation mode; when T21 is not less than T2 is less than T20, the air-conditioning system 100 enters a fourth operation mode; when T2 < T21, the air conditioning system 100 enters a fifth operating mode;

in a third operation mode, the rotating speed of the indoor fan is unchanged; in a fourth operation mode, the rotating speed P1 of the indoor fan is controlled to be reduced by a preset rotating speed delta P, and then the rotating speed P of the indoor fan is reduced by the preset rotating speed delta P every t time until the rotating speed P of the indoor fan is reduced to the minimum value; in a fifth mode of operation, the indoor fan is turned off.

It can be seen that in the embodiment of the present invention, the air conditioning system 100 operates the defrosting mode, three operation modes may be used, and it can be seen that the third to fifth operation modes are selected according to the magnitude of comparing the temperature of the indoor heat exchanger 2 with the second set temperature and the third preset temperature. The lower the temperature of the indoor heat exchanger 2 is, the lower the rotating speed of the indoor fan is, and even the indoor fan is turned off and stops rotating. Therefore, when T21 is more than or equal to T2 and more than or equal to T20 and T2 is more than or equal to T20, the indoor fan still rotates, and then the air conditioning system 100 can still be used for exchanging heat for the indoor space. When T2 < T21, the setting of the indoor fan being turned off can effectively shorten the defrosting time of the air conditioning system 100, so that the air conditioning system 100 can quickly return to the heating mode from the defrosting mode. While also avoiding blowing cool air out of the air conditioning system 100 to some extent due to a relatively low indoor temperature. Thereby being beneficial to improving the use experience of the user.

In some embodiments of the invention, T20 is from 40 ℃ to 55 ℃, T21 is from 25 ℃ to 40 ℃, Δ P is from 1r/s to 50r/s, and T is from 1s to 10 s. Alternatively, T20 is 50 ℃, T21 is 36 ℃ and Δ P is 8 r/s.

As shown in fig. 6, according to some embodiments of the present invention, the defrosting mode includes: acquiring an indoor temperature T1 and a temperature T2 of the indoor heat exchanger 2, comparing T2-T1 with a fourth set temperature delta T, and when T2-T1 is more than or equal to delta T, enabling the air conditioning system 100 to enter a sixth operation mode; when T2-T1 <. DELTA.T, the air conditioning system 100 enters a seventh operating mode; in a sixth operation mode, the rotating speed of the indoor fan is controlled to be reduced to a preset value; in a seventh mode of operation, the indoor fan is turned off.

It can be seen that, in the embodiment of the present invention, the air conditioning system 100 operates the defrosting mode, two operation modes may be used, and it can be seen that the sixth operation mode and the seventh operation mode are selected according to the magnitude of comparing the difference between the temperature of the indoor heat exchanger 2 and the indoor temperature with the fourth set temperature. When T2-T1 is not less than T, the air conditioning system 100 enters a sixth operation mode, and the rotating speed of the indoor fan is adjusted to a preset value; when T2-T1 <. DELTA.T, the air conditioning system 100 enters the seventh operating mode and the indoor fan is turned off.

Therefore, when the difference between the temperature of the indoor heat exchanger 2 and the indoor temperature is large, the indoor fan still rotates according to the preset value when the air conditioning system 100 operates in the defrosting mode, and then the heat exchange of the indoor space can still be performed by using the air conditioning system 100. When the difference between the temperature of the indoor heat exchanger 2 and the indoor temperature is relatively small, the indoor fan stops rotating, and the air conditioning system 100 stops exchanging heat with the indoor space. That is, when T2-T1 ≧ Δ T, the indoor fan still rotates according to the preset value, and then the air conditioning system 100 can still be utilized to exchange heat to the indoor space. When T2-T1 <. DELTA.T, the arrangement of the indoor fan being turned off can effectively shorten the defrosting time of the air conditioning system 100, so that the air conditioning system 100 can quickly return to the heating mode from the defrosting mode. While also avoiding blowing cool air out of the air conditioning system 100 to some extent due to a relatively low indoor temperature. Thereby being beneficial to improving the use experience of the user.

In some embodiments of the invention, Δ T is from 10 ℃ to 40 ℃. Alternatively, Δ T is from 12 ℃ to 46 ℃. Alternatively, Δ T is 13.5 ℃ to 42.8 ℃.

As shown in fig. 6, in some embodiments of the present invention, the preset value is a minimum value of the indoor fan rotation speed. Therefore, the air conditioning system 100 can still heat, the heat emitted by the refrigerant in the indoor heat exchanger 2 is reduced, the heat emitted by the refrigerant in the outdoor heat exchanger 4 is increased, and the defrosting time is shortened.

According to some embodiments of the invention, the defrosting mode further comprises: and acquiring the indoor temperature T1 and/or the indoor heat exchanger 2 temperature T2 every first set time interval and adjusting the air conditioning system 100 to enter different defrosting modes. Therefore, the sensitivity and flexibility of the air conditioning system 100 can be improved, and the defrosting efficiency of the air conditioning system 100 can be improved.

In some embodiments of the present invention, the first set time is in the range of 1s-120 s. Optionally, the first predetermined time is between 1s and 113 s. Optionally, the first predetermined time is between 1s-85 s. Optionally, the first predetermined time is between 1s and 40 s.

As shown in fig. 4-6, according to some embodiments of the present invention, the air conditioning system 100 further includes electric auxiliary heat, and the electric auxiliary heat is turned on in the first, third, fourth, and sixth operation modes; in the second, fifth and seventh operating modes, the electric auxiliary heat is turned off. As is known, in the first operation mode, the third operation mode, the fourth operation mode and the sixth operation mode, the indoor fan rotates, so that the electric auxiliary heat is turned on, which is beneficial to auxiliary heating of the temperature of the indoor air and ensures the heating effect of the air conditioning system 100. In the second operation mode, the fifth operation mode and the seventh operation mode, the indoor fan is turned off, and if the indoor fan is turned on by electric auxiliary heat, the indoor air cannot be effectively heated, and the use safety of the air conditioning system 100 is affected to a certain extent.

Meanwhile, it can be understood that, in the second operation mode, if the indoor fan is not turned off and the electric auxiliary heater is turned on, since the temperature of the electric auxiliary heater is high and the rotation speed of the indoor fan is low, the air outlet speed of the air conditioning system 100 is low and the air outlet amount is small, the air outlet temperature is too high and uncomfortable, and a user feels hot and dry. Similarly, in the final stage of the fourth operation mode, the rotation speed of the indoor fan has been reduced to the minimum value, and in the fifth operation mode, if the indoor fan is not turned off and the electric auxiliary heater is turned on, since the temperature of the electric auxiliary heater is higher and the rotation speed of the indoor fan is low, the air outlet speed of the air conditioning system 100 is low and the air outlet volume is small, the air outlet temperature is too high and uncomfortable, and the user feels hot and dry. Therefore, the control method of the air conditioning system 100 in the embodiment of the invention can prevent the air outlet temperature from being too high due to the fact that the electric auxiliary heat is turned on and the rotating speed of the indoor fan is too low when the air conditioning system 100 operates in the defrosting mode to a certain extent, so that people can be heated.

In some embodiments of the invention, the defrost mode further comprises: adjusting the heating power of the electric auxiliary heat according to at least one of the indoor temperature T1, the temperature T2 of the indoor heat exchanger 2 and the difference between the temperature T2 of the indoor heat exchanger 2 and the indoor temperature T1, wherein the heating power of the electric auxiliary heat is inversely related to the indoor temperature T1; the heating power of the electric auxiliary heat is inversely related to the temperature T2 of the indoor heat exchanger 2; the heating power of the electric auxiliary heat is inversely related to the difference between the indoor heat exchanger 2 temperature T2 and the indoor temperature T1. It can thus be understood that in the first operating mode, the higher T1, the lower the heating power of the controllable electric auxiliary heat; if T1 is gradually decreased, the heating power of the electric auxiliary heater can be gradually increased. In the third operation mode and the fourth operation mode, the higher T2 is, the lower the heating power of the electric auxiliary heat can be controlled; if T2 is gradually decreased, the heating power of the electric auxiliary heater can be gradually increased. In the sixth operation mode, the higher the T2-T1 is, the lower the heating power of the electric auxiliary heat can be controlled; if T2-T1 becomes smaller gradually, the heating power of the electric auxiliary heat can be increased gradually.

As shown in fig. 8 and 9, according to some embodiments of the present invention, the heater 5 is a heat accumulator including a heating element 51, the heat accumulator being connected in parallel with a line between the outdoor heat exchanger 4 and the return port 12 of the compressor 1. Therefore, it can be understood that, when the air conditioning system 100 operates in the defrosting mode, the refrigerant flowing out of the outdoor heat exchanger 4 may be heated by the heat accumulator to form a gaseous refrigerant, and finally flows back to the compressor 1, thereby being beneficial to ensuring the reliability of the defrosting mode of the air conditioning system 100. It will also be appreciated that the accumulator may utilize the heating element 51 to heat the refrigerant. Thereby being beneficial to improving the reliability of the heat accumulator for heating the refrigerant and further ensuring the reliability of the defrosting mode of the air conditioning system 100.

In some embodiments of the invention, the control method comprises: acquiring the temperature T6 of the heat accumulator, comparing the temperature T6 with a fifth set temperature T61 and a sixth set temperature T62, wherein T61 is less than T62, and if T6 is less than or equal to T61, turning on the heating element 51; if T6 ≧ T62, heating element 51 is turned off. It can be understood that when T6 is less than or equal to T61, it indicates that the heat of the heat accumulator is not enough to vaporize the refrigerant between the outdoor heat exchanger 4 and the return air port 12 of the compressor 1, so that the heating element 51 needs to be turned on to increase the heat in the heat accumulator, thereby ensuring the reliability of the defrosting mode of the air conditioning system 100. When the heating element 51 is turned on for a period of time, T6 is greater than or equal to T62, or the temperature T6 of the heat accumulator obtained for the first time is directly greater than or equal to T62, it indicates that the heat in the heat accumulator is sufficient to heat the refrigerant between the outdoor heat exchanger 4 and the return air port 12 of the compressor 1 to vaporize the refrigerant, and the heating element 51 is turned off, so that the energy consumption of the air conditioning system 100 can be reduced.

In some embodiments of the invention, turning on the heating element 51 also requires that: the temperature T3 at the outlet of the outdoor heat exchanger 4 is less than the seventh set temperature T31. It can be understood that when the temperature of the outdoor heat exchanger 4 is greater than the seventh set temperature T31, which indicates that the temperature of the outdoor heat exchanger 4 is relatively high, the defrosting mode does not need to be operated. Therefore, the condition that the temperature T3 at the outlet of the outdoor heat exchanger 4 is lower than the seventh set temperature T31 is set, so that the waste of energy consumption caused by the operation of the heating element 51 when defrosting is not needed can be avoided, and the energy saving of the air conditioning system 100 is facilitated. Alternatively, T31 was-5 ℃ to 1 ℃.

In some embodiments of the invention, T61 is between 20 ℃ and 80 ℃. Alternatively, T61 is from 23 ℃ to 67 ℃. Alternatively, T61 is from 25 ℃ to 50 ℃. Alternatively, T61 is from 28 ℃ to 44 ℃.

In some embodiments of the invention, T62 is from 50 ℃ to 150 ℃. Alternatively, T62 is from 50 ℃ to 130 ℃. Alternatively, T62 is from 55 ℃ to 120 ℃. Alternatively, T62 is 60 ℃ to 115 ℃.

In some embodiments of the invention, the temperature T6 of the heat accumulator and/or the temperature T3 of the outlet of the outdoor heat exchanger 4 are taken every second predetermined time and whether the heating element 51 is turned on or not is adjusted. Thereby making the control of the air conditioning system 100 more flexible, accurate, and timely. The working efficiency of the air conditioning system 100 is improved, and the energy consumption of the air conditioning system 100 is reduced.

According to some embodiments of the invention, the second predetermined time is 1s-150 s. Optionally, the second predetermined time is 1s-120 s. Optionally, the second predetermined time is 1s-100 s. Optionally, the second predetermined time is 1s-80 s. Optionally, the second predetermined time is 8s-60 s.

According to some embodiments of the present invention, the inlet of the outdoor heat exchanger 4 is provided with a first temperature sensor, the heater 5 is provided with a second temperature sensor, and the control method further comprises: acquiring states of a first temperature sensor and a second temperature sensor when defrosting is needed, and if at least one of the first temperature sensor and the second temperature sensor has a fault, performing refrigeration operation on the air-conditioning system 100 to defrost; and if the first temperature sensor and the second temperature sensor have no faults, operating the defrosting mode.

It is understood that if the air conditioning system 100 requires defrosting, which indicates that the outdoor temperature is low, the air conditioning system 100 generally heats the indoor air, i.e., operates the heating mode. The known air conditioning system 100 can be operated by refrigeration to defrost, so that reverse defrosting is realized. The air conditioning system 200 can also realize non-reversing defrosting through the defrosting mode in the invention, thereby being beneficial to ensuring the indoor temperature and improving the comfortable experience of users. As is known, the second temperature sensor is used for detecting the temperature of the heater 5, and the first temperature sensor is used for detecting the inlet temperature of the outdoor heat exchanger 4, if at least one of the two is failed, defrosting under the condition of no frost will occur to the air conditioning system 100 to some extent, and useless work is done, and energy consumption is increased. And also to some extent, affect the defrosting effect of the air conditioning system 100. Therefore, in the embodiment of the present invention, when the air conditioning system 100 needs the defrosting mode, the states of the first temperature sensor and the second temperature sensor are first obtained to determine whether a fault occurs in the first temperature sensor and the second temperature sensor, so that the working efficiency of the air conditioning system 100 is improved to a certain extent, and the energy consumption of the air conditioning system 100 is reduced. Specifically, if at least one of the first temperature sensor and the second temperature sensor has a fault, the air conditioning system 100 performs cooling operation to defrost (reverse defrosting); and if the first temperature sensor and the second temperature sensor have no faults, operating the defrosting mode (not reversing defrosting).

According to some embodiments of the present invention, the condition for the air conditioning system 100 to enter the defrost mode (no reverse defrost) is: the continuous heating time of the air conditioning system 100 reaches a first preset time, and the conditions that T30-T5 is greater than or equal to a first preset temperature or T3 is lower than a second preset temperature are met, wherein T5 is the temperature of the inlet of the outdoor heat exchanger 4, T30 is the lowest temperature value of the outlet of the outdoor heat exchanger 4 in a preset time before the current operation state of the outdoor heat exchanger 4, and T3 is the temperature of the outlet of the outdoor heat exchanger 4. Wherein, the current running state of the outdoor heat exchanger 4 is a heating state, and the preset time is 7min-12 min.

It should be noted that the continuous heating time is an uninterrupted heating operation time of the air conditioning system 100. It is understood that the air conditioning system 100 may be frosted after the continuous heating time reaches the first preset time, and the possibility of frosting of the air conditioning system 100 may be further increased when the temperature T30-T5 is greater than or equal to the first preset temperature. Similarly, T3 being lower than the second predetermined temperature may also increase the likelihood of frost formation in the air conditioning system 100.

Therefore, the air conditioning system 100 according to the embodiment of the invention determines whether the air conditioning system 100 operates in the defrosting mode by comparing the magnitudes of the T30-T5 and the first preset temperature, or by comparing the magnitudes of the T3 and the second preset temperature. Therefore, the defrosting mode of the air conditioning system 100 is reduced when defrosting is not needed, and the energy consumption of the air conditioning system 100 is reduced.

In some embodiments of the present invention, when the air conditioning system 100 satisfies one of the following entry conditions, the air conditioning system 100 operates the defrosting mode,

a1: the time for the air conditioning system 100 to continuously execute the heating mode is greater than or equal to a first time value, and the time for the T3 to be continuously lower than the first temperature value is greater than or equal to a second time value;

a2: the time for the air conditioning system 100 to continuously execute the heating mode is greater than or equal to the third time value, and T30-T5 is greater than or equal to the second temperature value;

a3: the time for the air conditioning system 100 to continuously execute the heating mode is greater than or equal to the fourth time value, and T30-T5 is greater than or equal to the third temperature value;

a4: the time for the air conditioning system 100 to continuously execute the heating mode is greater than or equal to the fifth time value, and the T30-T5 is greater than or equal to the fourth temperature value;

a5: the accumulated running time of the compressor 1 is more than or equal to the sixth time value, and T3 is less than or equal to the fifth temperature value;

It can be seen that the air conditioning system 100 may operate the defrosting mode when the air conditioning system 100 satisfies any one of the conditions a1 through a 5. Therefore, the air conditioning system 100 has more ways of judging whether to enter the defrosting mode, and the flexibility and the accuracy of the control of the air conditioning system 100 are improved.

In some embodiments of the invention, the first time value is 90min, the first temperature value is-3 ℃, and the second time value is 3 min; the third time value is 29min, and the second temperature value is 2.5 ℃; the fourth time value is 40min, and the third temperature value is 2.0 ℃; the fifth time value is 50min, and the fourth temperature value is 2.0 ℃; the sixth time value is 120min, and the fifth temperature value is-15 ℃. Therefore, the accuracy of judging whether the air conditioning system 100 frosts can be improved, the probability of frostless defrosting can be reduced, and further the waste of electric energy and the loss of the air conditioning system 100 caused by frostless defrosting can be reduced.

In some embodiments of the present invention, in a1-a5, each condition also needs to be satisfied simultaneously: the temperature T6 of the heater 5 is 60 ℃. As is known, the heater 5 is used to heat the refrigerant between the outdoor heat exchanger 4 and the compressor 1 to vaporize the refrigerant when operating the defrosting mode. When T6 satisfies 60 ℃ or higher, the heater 5 can be operated stably, and the efficiency and reliability of defrosting of the air conditioning system 100 can be improved.

According to some embodiments of the present invention, when the air conditioning system 100 meets one of the following end conditions, the air conditioning system 100 exits the defrost mode (without reversing defrost),

b1: t5 is greater than or equal to the sixth temperature value;

b2: t5 is greater than or equal to a seventh temperature value, the defrosting duration time reaches a second preset time, and the seventh temperature value is less than a sixth temperature value;

where T5 is the temperature at the inlet of the outdoor heat exchanger 4.

It can be seen that when the air conditioning system 100 satisfies any one of the conditions B1-B3, the air conditioning system 100 exits the defrost mode. Therefore, the air conditioning system 100 has more ways of judging whether to exit the defrosting mode, which is beneficial to improving the flexibility and accuracy of the control of the air conditioning system 100, reducing the probability of defrosting without defrosting to a certain extent, and reducing the energy consumption of the air conditioning system 100.

In some embodiments of the present invention, the sixth temperature value may be 4 ℃ to 15 ℃, the seventh temperature value may be 2 ℃ to 6 ℃, the second preset time may be 40s, and the third preset time may be 2min to 10 min. Specifically, the sixth temperature value is 6 ℃, the seventh temperature value is 4 ℃, the second preset time is 40s, and the third preset time is 4 min.

An air conditioning system 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 3.

As shown in fig. 1 to 3, according to the air conditioning system 100 according to the embodiment of the present invention, the air conditioning system 100 controls defrosting using the control method of the air conditioning system 100 according to the above-described embodiment of the present invention.

Specifically, the air conditioning system 100 includes: the air conditioner comprises a compressor 1, a reversing device 7, an indoor heat exchanger 2, an indoor fan, an electric auxiliary heater, an outdoor heat exchanger 4, an outdoor fan, an indoor throttling device 3, a first bypass pipeline 10, a second bypass pipeline 20, a heater 5 and a control assembly 6, wherein the reversing device 7 is provided with a first valve port 71, a second valve port 72, a third valve port 73 and a fourth valve port 74, the first valve port 71 is connected with an exhaust port 11 of the compressor 1, the second valve port 72 is connected with a return air port 12 of the compressor 1, the third valve port 73 is connected with one end of the indoor heat exchanger 2, the other end of the indoor heat exchanger 2 is connected with one end of the indoor throttling device 3, the fourth valve port 74 is connected with one end of the outdoor heat exchanger 4, the other end of the outdoor heat exchanger 4 is connected with the other end of the indoor throttling device 3, the reversing device 7 switches the first valve port 71 to be communicated with one of the third valve port 73 and the fourth valve port 74, the second valve port 72 is connected to the other of the third valve port 73 and the fourth valve port 74, the first bypass line 10 is connected in parallel to the first line 30 in which the indoor throttling device 3 is located, the second bypass line 20 is connected in parallel to the second line 40 connected between the outdoor heat exchanger 4 and the return air port 12, the heater 5 is connected in series to the second bypass line 20, the control unit 6 controls on/off of the first bypass line 10 and on/off of the second bypass line 20, the air conditioning system 100 has a defrosting mode (without defrosting switching), in the defrosting mode, the first bypass line 10 and the second bypass line 20 are respectively opened, the first valve port 71 is connected to the third valve port 73, and the second valve port 72 is connected to the fourth valve port 74.

Therefore, the air conditioning system 100 according to the embodiment of the present invention may operate the heating mode and the cooling mode, and may also operate the defrosting mode without reversing and the reversing defrosting mode.

When the air conditioning system 100 operates in the heating mode, the first bypass line 10 and the second bypass line 20 are respectively disconnected, the heater 5 does not need to operate, the first valve port 71 is connected to the third valve port 73, and the second valve port 72 is connected to the fourth valve port 74.

When the air conditioning system 100 operates in the cooling mode or performs defrosting by switching the direction, the first bypass line 10 and the second bypass line 20 are respectively disconnected, the heater 5 does not need to operate, the first port 71 is connected with the fourth port 74, and the second port 72 is connected with the third port 73.

When the air conditioning system 100 operates in the defrosting mode (defrosting without switching), the first bypass line 10 and the second bypass line 20 are respectively opened, the heater 5 operates, the first valve port 71 is communicated with the third valve port 73, and the second valve port 72 is communicated with the fourth valve port 74. At this time, the air conditioning system 100 is switched from the heating mode to the defrosting mode and then back to the heating mode, and the compressor 1 does not need to be stopped and the refrigerant flow direction does not change.

According to the air conditioning system 100 of the embodiment of the invention, a heating mode and a cooling mode can be operated, and a defrosting mode without reversing and a reversing defrosting mode can be operated.

According to some embodiments of the present invention, the control unit 6 is further capable of adjusting the distribution of the refrigerant flow rates of the first bypass line 10 and the first line 30, and/or adjusting the distribution of the refrigerant flow rates of the second bypass line 20 and the second line 40. Therefore, the control effect of the control assembly 6 is better, and the control and the use of the air conditioning system 100 are more flexible.

As shown in fig. 1-3, in some embodiments of the present invention, the control assembly 6 includes a first control valve 61 and a second control valve 62, the first control valve 61 is an electric two-way valve provided on the first bypass line 10, and the second control valve 62 is an electric three-way valve provided in a parallel branching position or a parallel merging position of the second bypass line 20 and the second line 40. Therefore, the effect of the control assembly 6 on controlling the refrigerant can be ensured, and the operation reliability of the air conditioning system 100 can be ensured. And simultaneously, the control assembly 6 is simple and reliable in structure.

As shown in fig. 7 to 9, in some embodiments of the present invention, the heater 5 is a regenerator, the regenerator includes a thermal storage box 52, a heating element 51 and a heat exchanger assembly 54, the thermal storage box 52 is filled with a thermal storage medium, a placement space 53 is defined in the thermal storage box 52, the heating element 51 and the heat exchanger assembly 54 are both disposed in the placement space 53, and the refrigerant in the second bypass line 20 flows through the heat exchanger assembly 54. It can be seen that the regenerator can turn on the heating element 51 to absorb heat through the heat storage medium and thus heat the refrigerant in the second bypass line 20, and the heat storage medium can also absorb heat released by the compressor 1 when the compressor 1 is operating. The effect of the heat accumulator for heating the refrigerant in the second bypass pipeline 20 is improved, the refrigerant in the second bypass pipeline 20 is gasified more completely, the reliability of the defrosting mode of the air conditioning system 100 is ensured, and the reliability of the air conditioning system 100 is ensured. Meanwhile, it can be understood that the refrigerant in the second bypass line 20 flows through the heat exchanger assembly 54 in the heat storage box 52, so that the heat in the heat accumulator can be absorbed more effectively, which is beneficial to the gasification of the refrigerant.

As shown in fig. 8 and 9, in some embodiments of the present invention, the regenerator further includes a limiting frame 55, the heat exchanger assembly 54 includes a first heat exchanging part 541 and a second heat exchanging part 542 which are arranged in two rows, the limiting frame 55 is located between the first heat exchanging part 541 and the second heat exchanging part 542, and the heating element 51 is disposed on the limiting frame 55. Therefore, the heat accumulator is simple in structure, the relative positions of the limiting frame 55 and the heating element 51 are arranged, the uniformity of heating of the heating element 51 on the refrigerant flowing through the first heat exchange part 541 and the second heat exchange part 542 is improved, and meanwhile, the limiting frame 55 can limit the heating element 51 to a certain degree, so that the position of the heating element 51 in the placing space 53 is relatively stable. Further, the effect of the heat accumulator for heating the refrigerant in the second bypass pipeline 20 is ensured, and the reliability of the heat accumulator is improved.

As shown in fig. 8, in some embodiments of the present invention, the spacing bracket 55 includes a first bracket 551 and a second bracket 552, the first bracket 551 and the second bracket 552 are connected to define a spacing space 553, and the heating element 51 is disposed in the spacing space 553 to be spaced apart from the heat exchanger assembly 54. The heating element 51 can thus be spaced apart from the heat exchanger assembly 54, thereby increasing the safety and reliability of the regenerator during operation. Alternatively, the interval between the heating element 51 and the first heat exchanging portion 541 is not less than 4mm, and the interval between the heating element 51 and the second heat exchanging portion 542 is not less than 4 mm.

In some embodiments of the invention, the heating element 51 is a PTC. Therefore, the heating element 51 has a reliable structure and a wide source, and the reliability of the heat accumulator for heating the refrigerant in the second bypass pipeline 20 is ensured. Of course, the heating element 51 may be a structure in which electricity is directly supplied to heat, such as a heat pipe.

It can be understood that, when the heating element 51 is a structure requiring power supply, then when the air conditioning system 100 is assembled, a wiring harness may be introduced into the heat storage box 52, at this time, a wiring sealing structure needs to be arranged to improve the sealing performance of the heat storage box 52, so that the heat preservation effect of the heat storage box 52 may be improved, and meanwhile, the heat storage medium is favorable for preventing the heat absorption medium from flowing out from the gap on the heat storage box 52 after undergoing phase change (for example, the heat storage medium is paraffin, the heating element 51 provides heat for the heat storage medium after supplying power, the paraffin undergoes phase change after absorbing heat to form a liquid state, the wiring sealing structure is favorable for preventing the liquid paraffin from flowing out, and further, the reliability of the heat storage operation may be improved). Specifically, for example, an outlet is provided on the thermal storage case 52 for leading in or out a wire harness, and a gap between the wire harness and the thermal storage case 52 is sealed by a seal ring to improve the sealing performance of the thermal storage case 52. When the heating element 51 is a structure requiring power supply, a connection terminal may be fixedly disposed on the heat storage box 52, and the connection terminal is connected to the heating element 51 and is externally connected to a control and power wiring harness.

It is of course understood that the thermal storage cassette 52 is preferably formed in a sealed structure to improve the sealability of the thermal storage cassette 52. For example, the heat storage case 52 includes a cover and a case with one open end, the cover covers the case, and a sealing ring is disposed at a joint position of the case and the cover, so that a gap between the case and the cover is closed by the sealing ring.

In some embodiments of the invention, the heating element 51 is a piece of magnetically permeable material, and the regenerator further comprises an electromagnetic element provided on the regenerator body 52 to electromagnetically cooperate with the heating element 51. It should be noted that the electromagnetic engagement means that the electromagnetic element can cooperate with the heating element 51 to enable the heating element 51 to generate heat when the electromagnetic element is energized. Thereby making the way the heat accumulator generates heat reliable. The electromagnetic element may be provided on the outer peripheral wall of the thermal storage case 52 or may be provided inside the thermal storage case 52. If the thermal storage case 52 has a double-layer structure, the electromagnetic element may be located between the double-layer structure.

In some embodiments of the present invention, the thermal storage cassette 52 is a thermal cassette. Therefore, the heat accumulator can be insulated, the refrigerant heating efficiency of the heat accumulator is improved, the defrosting efficiency of the air conditioning system 100 is improved, and the energy consumption of the air conditioning system 100 during defrosting is reduced. Optionally, the thermal storage box 52 is a double-layer structure, and a vacuum and heat preservation medium is filled between the double-layer boxes. Alternatively, the heat storage case 52 may have an outer peripheral wall to which heat insulating cotton is attached.

In some embodiments of the present invention, the second temperature sensor and the fuse are disposed on the thermal storage device, and the second temperature sensor and the fuse may be disposed inside the thermal storage box 52 or outside the thermal storage box 52. When the thermal storage case 52 has a double-layered structure, the second temperature sensor and the fuse may be provided between the double-layered cases. So that the temperature of the thermal accumulator can be detected.

In some embodiments of the present invention, the heating element 51 is located at a middle lower portion of the placing space 53. It should be noted that the heat storage medium filled in the heat storage box 52 floats upwards when the heat is high, so that the position of the heating element 51 is favorable for ensuring that the heat storage medium can be effectively and comprehensively heated, the heat storage medium has high heat, and the efficiency of the heat accumulator for heating the refrigerant is improved.

In some embodiments of the invention, the regenerator also includes a buffer structure for buffering the gas pressure within the regenerator cartridge 52. It is known that a heat storage medium (for example, paraffin) may undergo a phase change (solid state to liquid state) after absorbing heat to cause a volume change (volume increase), at this time, a space in the heat storage box body 52 is limited, so that a volume of gas may also change (volume decrease, pressure increase), and in addition, a pressure of gas in the heat storage box body 52 may also increase after being heated, and thus a buffer junction is disposed on the heat accumulator to effectively buffer a volume change of the heat storage medium and a pressure change of the gas, thereby being beneficial to ensuring safety and reliability of the heat accumulator during heat storage, and further ensuring reliability of the air conditioning system 100.

Alternatively, the thermal storage medium does not completely fill the internal space of the thermal storage cassette 52, and the unfilled headspace inside the thermal storage cassette 52 is configured in a structure for buffering the change in the volume of the thermal storage medium. Optionally, the heat storage box body 52 is provided with an exhaust hole, and a buffer structure is formed by air suction and air discharge of the exhaust hole to buffer the air pressure; alternatively, the thermal storage case 52 includes a housing and an upper cover movably coupled to the housing to form a buffer structure to buffer the pressure of the gas in the thermal storage case 52. Optionally, a pressure stabilizer is disposed on the heat storage box 52 to form a buffer structure, and the gas pressure inside the heat storage box 52 is stabilized by the pressure stabilizer.

Other configurations and operations of the air conditioning system 100 according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The control method of the air conditioning system is characterized in that the air conditioning system comprises a compressor, an indoor heat exchanger, an indoor fan, an indoor throttling device, an outdoor heat exchanger, an outdoor fan, a first bypass pipeline, a heater and a control assembly, the first bypass pipeline is connected with the indoor throttling device in parallel, the heater is suitable for heating a refrigerant between the outdoor heat exchanger and the compressor, a first temperature sensor is arranged at an inlet of the outdoor heat exchanger, a second temperature sensor is arranged on the heater, the control method comprises a defrosting operation mode, and the defrosting mode comprises the following steps:

the air conditioning system heats and operates, the first bypass pipeline is communicated, the heater heats a refrigerant between the outdoor heat exchanger and the compressor,

adjusting the indoor fan rotating speed P according to at least one of the indoor temperature T1 and the difference value between the indoor heat exchanger temperature T2 and the indoor temperature T1,

wherein the indoor fan speed P is positively correlated with the indoor temperature T1; the indoor fan rotating speed P is positively correlated with the difference between the indoor heat exchanger temperature T2 and the indoor temperature T1; in the defrosting mode, the outdoor fan is always closed;

the control method further comprises the following steps:

acquiring the states of the first temperature sensor and the second temperature sensor when defrosting is needed,

if at least one of the first temperature sensor and the second temperature sensor has a fault, the air conditioning system is operated in a refrigerating mode to defrost; and if the first temperature sensor and the second temperature sensor have no faults, operating the defrosting mode.

2. The control method of an air conditioning system according to claim 1, wherein the defrosting mode includes:

the indoor temperature T1 is obtained, the indoor temperature T1 is compared with a first set temperature T0, and when the temperature T1 is more than or equal to T0, the air conditioning system enters a first operation mode; when T1 < T0, the air conditioning system enters a second operation mode;

in the first operation mode, P = Pmin + T1 (Pmax-Pmin)/Tmax, where Pmin is a minimum value of the indoor fan rotational speed, Pmax is a maximum value of the indoor fan rotational speed, and Tmax is a maximum value that the indoor temperature can reach;

and in the second operation mode, the indoor fan is turned off.

3. The control method of an air conditioning system according to claim 2, wherein T0 is 5 ℃ to 25 ℃, Pmin is 100r/s to 800r/s, Pmax is 800r/s to 2000r/s, and Tmax is 5 ℃ to 25 ℃.

4. The control method of an air conditioning system according to claim 1, wherein the defrosting mode includes:

obtaining the temperature T2 of the indoor heat exchanger, and comparing the temperature T2 with a second set temperature T20 and a third set temperature T21, wherein T21 is less than T20, and when T2 is more than or equal to T20, the air conditioning system enters a third operation mode; when T21 is more than or equal to T2 is more than T20, the air conditioning system enters a fourth operation mode; when T2 is less than T21, the air conditioning system enters a fifth operation mode;

in the third operation mode, the rotating speed of the indoor fan is unchanged;

in the fourth operation mode, the rotating speed P of the indoor fan is controlled to be reduced by a preset rotating speed delta P, and then the rotating speed P of the indoor fan is reduced by the preset rotating speed delta P every t time until the rotating speed P of the indoor fan is reduced to the minimum value;

and in the fifth operation mode, the indoor fan is turned off.

5. The control method of an air conditioning system according to claim 4, wherein T20 is 40 ℃ to 55 ℃, T21 is 25 ℃ to 40 ℃, Δ P is 1r/s to 50r/s, and T is 1s to 10 s.

6. The control method of an air conditioning system according to claim 1, wherein the defrosting mode includes:

acquiring the indoor temperature T1 and the temperature T2 of the indoor heat exchanger, comparing T2-T1 with a fourth set temperature delta T, and when T2-T1 is larger than or equal to the delta T, enabling the air conditioning system to enter a sixth operation mode; when T2-T1 <. DELTA.T, the air conditioning system enters a seventh operating mode;

in the sixth operation mode, the rotating speed of the indoor fan is controlled to be reduced to a preset value;

and in the seventh operation mode, the indoor fan is turned off.

7. The control method of an air conditioning system according to claim 6, wherein Δ T is 10 ℃ to 40 ℃.

8. The control method of an air conditioning system according to claim 6, wherein the preset value is a minimum value of the indoor fan rotation speed.

9. The control method of an air conditioning system according to any one of claims 2, 4 and 6, wherein the defrosting mode further includes:

and acquiring the indoor temperature T1 and/or the indoor heat exchanger temperature T2 every first set time and adjusting the air conditioning system to enter different defrosting modes.

10. The control method of an air conditioning system as claimed in claim 9, wherein the first set time is in a range of 1s-120 s.

11. The control method of an air conditioning system according to claim 2, characterized in that the air conditioning system further includes an electric auxiliary heat, and in the first operation mode, the electric auxiliary heat is turned on; in the second operating mode, the electric auxiliary heat is switched off.

12. The control method of an air conditioning system according to claim 4, characterized in that the air conditioning system further includes electric auxiliary heat, and in the third and fourth operation modes, the electric auxiliary heat is turned on; in the fifth operating mode, the electric auxiliary heat is switched off.

13. The control method of an air conditioning system according to claim 6, characterized in that the air conditioning system further includes an electric auxiliary heat, and in the sixth operation mode, the electric auxiliary heat is turned on; in the seventh operating mode, the electric auxiliary heat is switched off.

14. The control method of an air conditioning system as claimed in any one of claims 11 to 13, wherein the defrost mode further comprises: adjusting the heating power of the electrically auxiliary heat in dependence on at least one of the indoor temperature T1, the indoor heat exchanger temperature T2 and the difference between the indoor heat exchanger temperature T2 and the indoor temperature T1,

the heating power of the electric auxiliary heat is inversely related to the indoor temperature T1;

the heating power of the electric auxiliary heat is inversely related to the indoor heat exchanger temperature T2;

the heating power of the electrically assisted heat is inversely related to the difference between the indoor heat exchanger temperature T2 and the indoor temperature T1.

15. The control method of an air conditioning system according to claim 1, wherein the heater is a heat accumulator including a heating element, and the heat accumulator is connected in parallel with a pipe between the outdoor heat exchanger and a return air port of the compressor.

16. The control method of an air conditioning system according to claim 15, characterized by comprising: acquiring the temperature T6 of the heat accumulator, and comparing the temperature T6 with a fifth set temperature T61 and a sixth set temperature T62, wherein T61 is less than T62, and if T6 is less than or equal to T61, turning on the heating element; if T6 ≧ T62, the heating element is turned off.

17. The control method of an air conditioning system as set forth in claim 16, wherein turning on said heating element further requires simultaneously: the temperature T3 of the outdoor heat exchanger outlet is less than the seventh set temperature T31.

18. The control method of an air conditioning system as claimed in claim 16, wherein T61 is 20 ℃ to 80 ℃ and T62 is 50 ℃ to 150 ℃.

19. The control method of an air conditioning system as set forth in claim 17, wherein the temperature T6 of said heat accumulator and/or the temperature T3 of said outdoor heat exchanger outlet is obtained every second set time and whether said heating element is turned on or not is adjusted.

20. The control method of an air conditioning system according to claim 1, wherein the condition that the air conditioning system needs to operate the defrosting mode is:

the air conditioning system continuously heats for a first preset time, and meets the condition that T30-T5 is greater than or equal to a first preset temperature or T3 is lower than a second preset temperature, wherein T5 is the temperature of an inlet of the outdoor heat exchanger, T30 is the lowest temperature value of an outlet of the outdoor heat exchanger in a preset time before the current running state of the outdoor heat exchanger, and T3 is the temperature of the outlet of the outdoor heat exchanger.

21. The control method of an air conditioning system according to claim 20, wherein the air conditioning system operates a defrosting mode when the air conditioning system satisfies one of the following entry conditions,

a2: the time for the air conditioning system to continuously execute the heating mode is greater than or equal to a third time value, and T30-T5 is greater than or equal to a second temperature value;

22. The control method of an air conditioning system according to claim 21,

the first time value is 90min, the first temperature value is-3 ℃, and the second time value is 3 min;

the third time value is 29min, and the second temperature value is 2.5 ℃;

the fourth time value is 40min, and the third temperature value is 2.0 ℃;

the fifth time value is 50min, and the fourth temperature value is 2.0 ℃;

the sixth time value is 120min, and the fifth temperature value is-15 ℃.

23. The control method of an air conditioning system as claimed in claim 21, wherein in a1 to a5, each condition is also required to be satisfied at the same time: the temperature of the heater is greater than or equal to 60 ℃.

24. The control method of an air conditioning system according to claim 1, wherein the air conditioning system exits a defrosting mode when the air conditioning system satisfies one of the following end conditions,

b1: t5 is greater than or equal to the sixth temperature value;

wherein T5 is the temperature of the outdoor heat exchanger inlet.

25. The method of claim 24, wherein the sixth temperature value is 6 ℃, the seventh temperature value is 4 ℃, the second preset time is 40s, and the third preset time is 4 min.

26. An air conditioning system characterized in that the air conditioning system controls defrosting using the control method of the air conditioning system according to any one of claims 1 to 25,

the air conditioning system includes: the air conditioner comprises a compressor, a reversing device, an indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, an indoor throttling device, a first bypass pipeline, a second bypass pipeline, a heater and a control assembly, wherein the reversing device is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is connected with an exhaust port of the compressor, the second valve port is connected with a return air port of the compressor, the third valve port is connected with one end of the indoor heat exchanger, the other end of the indoor heat exchanger is connected with one end of the indoor throttling device, the fourth valve port is connected with one end of the outdoor heat exchanger, the other end of the outdoor heat exchanger is connected with the other end of the indoor throttling device, the reversing device switches the first valve port to be communicated with one of the third valve port and the fourth valve port, and the second valve port is communicated with the other of the third valve port and the fourth valve port, the first bypass pipeline is connected in parallel with a first pipeline where the indoor throttling device is located, the second bypass pipeline is connected in parallel with a second pipeline connected between the outdoor heat exchanger and the air return port, the heater is connected in series with the second bypass pipeline, the control component controls the on-off of the first bypass pipeline and the on-off of the second bypass pipeline, the air conditioning system has a defrosting mode, in the defrosting mode, the first bypass pipeline and the second bypass pipeline are respectively communicated, the first valve port is communicated with the third valve port, and the second valve port is communicated with the fourth valve port.

27. The system of claim 26, wherein the control assembly is further configured to adjust a refrigerant flow distribution of the first bypass line and the first line, and/or adjust a refrigerant flow distribution of the second bypass line and the second line.

28. The air conditioning system as claimed in claim 27, wherein the control assembly includes a first control valve provided to the electric two-way valve on the first bypass line and a second control valve provided to the electric three-way valve at a position where the second bypass line and the second line are branched in parallel or merged in parallel.

29. The air conditioning system as claimed in claim 28, wherein the heater is a heat accumulator including a heat accumulation case filled with a heat accumulation medium, a heating element and a heat exchanger assembly, the heat accumulation case defining a placement space therein, the heating element and the heat exchanger assembly being both disposed in the placement space, and the refrigerant in the second bypass line flowing through the heat exchanger assembly.

30. The air conditioning system of claim 29, wherein the heat accumulator further comprises a spacing frame, the heat exchanger assembly comprises a first heat exchange portion and a second heat exchange portion arranged in two rows, the spacing frame is located between the first heat exchange portion and the second heat exchange portion, and the heating element is disposed on the spacing frame.

31. The air conditioning system of claim 30, wherein the restraint bracket includes a first bracket and a second bracket, the first bracket and the second bracket coupled to define a restraint space, the heating element disposed within the restraint space to be spaced apart from the heat exchanger assembly.

32. An air conditioning system according to claim 29, wherein the heating element is a PTC.

33. The air conditioning system of claim 29 wherein said heating element is a piece of magnetically permeable material, said heat accumulator further comprising an electromagnetic element provided on said heat accumulation cartridge for electromagnetically cooperating with said heating element.

34. The air conditioning system as claimed in claim 29, wherein the heating element is located at a middle lower portion of the placing space.

35. An air conditioning system according to claim 29, wherein the heat accumulator further comprises a buffer structure for buffering the pressure of gas within the heat accumulation cartridge.