Air conditioner heating circulating system and control method

Abstract

The invention provides an air conditioner heating circulation system and a control method. The air conditioner heating circulation system comprises a bypass branch arranged on one side of a compressor in parallel, an inlet of the bypass branch communicates with an exhaust port of the compressor, an outlet of the bypass branch communicates with an air suction port of the compressor, and a bypass capillary tube and a bypass expansion valve are arranged on the bypass branch in series; an outlet of the bypass expansion valve is communicated with an air suction port of the compressor; the auxiliary throttling assembly is arranged on a refrigerant pipe between the compressor and the outdoor heat exchanger, an inlet of the auxiliary throttling assembly communicates with an outlet of the outdoor heat exchanger, an outlet of the auxiliary throttling assembly communicates with an air suction port of the compressor and an outlet of the bypass branch, and the auxiliary throttling assembly comprises a defrosting capillary tube and an electromagnetic valve; the defrosting capillary tube and the electromagnetic valve are arranged in parallel. And the defrosting temperature sensor is arranged on the refrigerant pipe between the main expansion valve and the outdoor heat exchanger. According to the invention, the air conditioner can perform defrosting operation under the condition of continuous heating.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning heating cycle system and a control method. Background Art

[0002] When the air conditioner is heating in winter, frost will form on the outdoor heat exchanger, so it is necessary to temporarily stop the heating operation and perform the defrosting operation. Therefore, heating cannot be performed during the defrosting operation, and the indoor unit cools the surrounding air in order to function as an evaporator, which has the problem of lowering the indoor temperature. As a countermeasure, there is a technology that divides the outdoor heat exchanger into two parts, performs heating operation on one side, and defrosts the other side. However, since the outdoor heat exchanger is divided into two parts, the structure is complicated and the material cost is greatly increased. In addition, the water melted by the defrosting operation flows to the heat exchanger in the heating operation, and sometimes freezes again. Summary of the invention

[0003] Therefore, the embodiments of the present invention provide an air-conditioning heating cycle system and a control method, so that the air-conditioning can perform defrosting operation while continuing heating.

[0004] To solve the above problems, the present invention provides an air conditioning heating circulation system, comprising a compressor, an indoor heat exchanger, a main expansion valve, and an outdoor heat exchanger. The compressor, the indoor heat exchanger, the main expansion valve, and the outdoor heat exchanger are connected in sequence through a refrigerant pipe to form a basic circulation loop, and is characterized in that the air conditioning heating circulation system also includes a bypass capillary, a bypass expansion valve, an auxiliary throttling component, and a defrost temperature sensor; a bypass branch is arranged in parallel on one side of the compressor, the inlet of the bypass branch is connected to the exhaust port of the compressor, and the outlet of the bypass branch is connected to the intake port of the compressor, the bypass capillary and the bypass expansion valve are arranged in series on the bypass branch, the inlet of the bypass capillary is connected to the exhaust port of the compressor, and the outlet of the bypass expansion valve is connected to the intake port of the compressor; the auxiliary throttling component is arranged on the refrigerant pipe between the compressor and the outdoor heat exchanger, the inlet of the auxiliary throttling component is connected to the outlet of the outdoor heat exchanger, and the outlet of the auxiliary throttling component is connected to the intake port of the compressor and the outlet of the bypass branch, and the auxiliary throttling component includes a defrost capillary and a solenoid valve, and the defrost capillary and the solenoid valve are arranged in parallel. The defrost temperature sensor is installed on the refrigerant pipe between the main expansion valve and the outdoor heat exchanger.

[0005] Compared with the prior art, the technical effect achieved by adopting this technical scheme is as follows: by forming a bypass loop, the auxiliary throttling component is arranged on the refrigerant pipe between the compressor and the outdoor heat exchanger, and the inlet of the auxiliary throttling component is connected to the outlet of the outdoor heat exchanger, and the outlet of the auxiliary throttling component is connected to the air intake of the compressor and the outlet of the bypass branch. Through this arrangement, the air-conditioning system can perform defrost operation under continuous heating. Compared with the traditional air-conditioning heating cycle system, this structural arrangement makes the failure probability of the compressor lower, and it can also operate defrost during heating, which can better inhibit the growth of frost. Compared with the traditional defrosting, the defrosting ability is better, and the normal heating operation of the air-conditioning system can be better guaranteed. At the same time, this method has a simpler structure and lower cost. A defrost capillary is also provided, which can better reduce the pressure of the refrigerant whose heat is taken away by the outdoor heat exchanger, ensuring that the refrigerant can be better sucked into the compressor, thereby better reducing the failure rate of the compressor. At the same time, a defrost temperature sensor is provided, and the temperature of the pipeline between the outdoor heat exchanger and the main expansion valve is detected by the defrost temperature sensor, so that the state in the air-conditioning system can be better controlled, ensuring that the air-conditioning system can be better defrosted, thereby making the heating use of the air-conditioning system more reasonable and sustainable.

[0006] The present invention also provides a continuous heating control method, which is applied to the air conditioning heating cycle system as mentioned above, and the control method includes: obtaining the outdoor air temperature as a first temperature value; obtaining the temperature detected by the defrost temperature sensor as a second temperature value; and determining a target defrost mode for the air conditioner to enter among multiple defrost modes based on the first temperature value and the second temperature value, the target defrost mode including: a continuous heating defrost mode and a reverse cycle defrost mode.

[0007] Compared with the prior art, the technical effect achieved by adopting this technical scheme is as follows: by setting the outdoor air temperature and the temperature detected by the defrost temperature sensor as the conditions for adjusting the air conditioner to enter the target defrost mode, the air conditioner can enter the corresponding target defrost mode under more appropriate circumstances, and thus can better defrost the current air conditioner, and can enable the air conditioner to better heat, while ensuring the normal operation of the compressor, so that the air conditioner can operate more stably and ensure the user's experience; by setting a continuous heating defrost mode and a reverse cycle defrost mode, the current air-conditioning system situation can be better controlled through different defrost modes, ensuring that the frost generated during the operation of the air conditioner can be better eliminated; at the same time, the continuous heating defrost mode can defrost when the air-conditioning system is continuously heating, ensuring the continuous operation of the air-conditioning heating without stopping, which can better improve the user's experience.

[0008] In one example of the present invention, determining a target defrost mode that the air conditioner intends to enter among multiple defrost modes based on a first temperature value and a second temperature value also includes: determining multiple temperature threshold intervals based on the first temperature value, and the multiple temperature threshold intervals increase as the first temperature value increases; determining, based on the second temperature value, among multiple temperature threshold intervals, a temperature threshold interval into which the second temperature value falls; and determining the target defrost mode of the air conditioner based on the temperature threshold interval.

[0009] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by determining the temperature threshold interval according to the external ambient temperature, the setting of the temperature threshold interval is more in line with the current environmental conditions, which can facilitate subsequent adjustments. By setting the corresponding temperature threshold interval where the current second temperature value is located in multiple temperature threshold intervals, the target defrost mode is determined by the temperature threshold interval. In this way, the selection of the target defrost mode can be more accurate, which ensures that the state differentiation of the air-conditioning system is more refined, and the current state can be better adjusted and controlled, thereby ensuring the stable heating of the air-conditioning system.

[0010] In one example of the present invention, multiple temperature threshold intervals include a first threshold interval and a second threshold interval, and the left endpoint of the first threshold interval is greater than the right endpoint of the second threshold interval. Determining the target defrost mode of the air conditioner based on the temperature threshold intervals also includes: when the second temperature value falls within the first threshold interval, determining the target defrost mode of the air conditioner to be a continuous heating defrost mode; when the second temperature value falls within the second threshold interval, determining the target defrost mode of the air conditioner to be a reverse cycle defrost mode; wherein the continuous heating defrost mode includes: controlling the solenoid valve to close, controlling the main expansion valve to be fully open, and controlling the bypass expansion valve to be open.

[0011] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by setting the second temperature value in the first threshold interval to select the continuous heating defrost mode, and by closing the solenoid valve and controlling the main expansion valve to be fully opened and the bypass expansion valve to open, the air conditioner can be defrosted during continuous heating, so that the air conditioning system does not need to turn off the heating mode for defrosting, ensuring the continuous operation of the air conditioning system during heating, and improving the user's experience and the practicality of the air conditioning system. By setting the second temperature value in the second threshold interval to control the air conditioner to enter the reverse cycle defrost mode, the defrosting capacity of the air conditioner is improved, ensuring that the air conditioner can quickly defrost in a low temperature environment, ensuring the ability of the air conditioning system to cope with different environments, and thus ensuring the user's heating experience.

[0012] In an example of the present invention, the continuous heating and defrosting mode further includes: acquiring the exhaust temperature of the compressor, and controlling the opening of the bypass expansion valve according to the exhaust temperature of the compressor.

[0013] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by controlling the compressor frequency to remain stable in the continuous heating and defrosting mode, and making the main expansion valve fully open, the state of the air-conditioning system is made more stable during continuous heating and defrosting. At the same time, the bypass expansion valve is controlled according to the exhaust temperature of the compressor, thereby ensuring the reliability of the compressor to maintain the exhaust temperature of the compressor required for heating, thereby improving the stability of the air-conditioning system.

[0014] In one example of the present invention, the exhaust temperature of the compressor is obtained, and controlling the opening of the bypass expansion valve according to the exhaust temperature of the compressor also includes: when the exhaust temperature of the compressor is in a first temperature range, maintaining the opening of the bypass expansion valve unchanged; when the exhaust temperature of the compressor is lower than the first temperature range, increasing the opening of the bypass expansion valve; when the exhaust temperature of the row of compressors is higher than the first temperature range, reducing the opening of the bypass expansion valve.

[0015] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by controlling the opening of the bypass expansion valve according to the exhaust temperature of the compressor to ensure the stability of the exhaust temperature of the compressor, the operation of the compressor is more stable, and the defrosting and heating operations are more stable, thereby reducing the probability of failure of the compressor, and thus better ensuring the stable operation of the air-conditioning system, thereby providing users with a better experience and improving the practicality of the air conditioner.

[0016] In one example of the present invention, the control method further includes: when the second temperature value is greater than the temperature threshold, controlling the air conditioner to execute a conventional heating mode; and / or, when the air conditioner enters a continuous heating and defrosting mode for a first period of time, controlling the air conditioner to execute a conventional heating mode.

[0017] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by setting the conventional heating mode to be executed when the second temperature value is greater than the temperature threshold, it means that the air conditioner defrost is completed at this temperature and there is no need to continue defrosting, thereby reducing the power usage and thus reducing the energy consumption of the air conditioner. At the same time, it is also set to execute the conventional heating mode after the air conditioner enters the continuous heating defrost mode for the first time. In this way, it is prevented from entering the continuous heating defrost mode for too long, thereby affecting the normal operation of the air conditioning system.

[0018] After adopting the technical solution of the present invention, the following technical effects can be achieved: (1) By forming a bypass loop, an auxiliary throttling component is arranged on the refrigerant pipe between the compressor and the outdoor heat exchanger, and the inlet of the auxiliary throttling component is connected to the outlet of the outdoor heat exchanger, and the outlet of the auxiliary throttling component is connected to the air intake of the compressor and the outlet of the bypass branch. Through this arrangement, the air-conditioning system can perform defrosting operation under continuous heating. Compared with the traditional air-conditioning heating cycle system, this structural arrangement makes the failure probability of the compressor lower. At the same time, it can also operate defrosting during heating, which can better inhibit the growth of frost. Compared with the traditional defrosting, the defrosting ability is better, which can better ensure the normal heating operation of the air-conditioning system. At the same time, this method has a simpler structure and lower cost. A defrost capillary is also provided, which can better reduce the pressure of the refrigerant whose heat is taken away by the outdoor heat exchanger, so as to ensure that the refrigerant can be better sucked into the compressor, thereby better reducing the failure rate of the compressor. At the same time, a defrost temperature sensor is provided, which can detect the temperature of the pipeline between the outdoor heat exchanger and the main expansion valve, thereby better controlling the state in the air-conditioning system, ensuring that the air-conditioning system can be better defrosted, thereby making the heating use of the air-conditioning system more reasonable and continuous; (2) By setting the outdoor air temperature and the temperature detected by the defrost temperature sensor as the conditions for adjusting the air conditioner to enter the target defrost mode, the air conditioner can enter the corresponding target defrost mode under more appropriate circumstances, thereby better defrosting the current air conditioner, enabling the air conditioner to heat better, while ensuring the normal operation of the compressor, thereby enabling the air conditioner to operate more stably and ensuring the user experience. By setting a continuous heating defrost mode and a reverse cycle defrost mode, different defrost modes can better control the current air conditioning system situation, ensuring that the frost generated during the operation of the air conditioner can be better eliminated. At the same time, the continuous heating defrost mode can defrost when the air conditioning system is continuously heating, ensuring the continuous operation of the air conditioning heating without stopping, which can better improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings to be used in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 A schematic diagram of the structure of an air conditioning heating cycle system for continuous heating using a bypass loop provided in an embodiment of the present invention; Figure 2 A schematic flow chart of a continuous heating control method provided by an embodiment of the present invention; Figure 3This is the Mollier line diagram for continuous heating operation; Figure 4 It is the threshold for entering different defrost modes.

[0019] Description of reference numerals: 100. Air conditioning heating cycle system using bypass loop for continuous heating; 110. Compressor; 120. Exhaust pipe; 130. Four-way valve; 140. Bypass capillary tube; 150. Bypass expansion valve; 160. Defrost capillary tube; 170. Solenoid valve; 180. Outdoor heat exchanger; 190. Main expansion valve; 200. Indoor heat exchanger; 210. Defrost temperature sensor. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] [First embodiment] See also Figure 1 The present invention provides an air conditioning heating cycle system 100 for continuous heating using a bypass loop, the air conditioning heating cycle system comprising: a compressor 110, an indoor heat exchanger 200, a main expansion valve 190, and an outdoor heat exchanger 180, the compressor 110, the indoor heat exchanger 200, the main expansion valve 190, and the outdoor heat exchanger 180 are sequentially connected through a refrigerant pipe to form a basic circulation loop, characterized in that the air conditioning heating cycle system also includes a bypass capillary 140, a bypass expansion valve 150, an auxiliary throttling component, and a defrosting temperature sensor 210; a bypass branch is arranged in parallel on one side of the compressor 110, the inlet of the bypass branch is connected to the exhaust port of the compressor 110, and the bypass branch is connected to the exhaust port of the compressor 110. The outlet of the branch is connected to the air intake of the compressor 110, the bypass capillary 140 and the bypass expansion valve 150 are arranged in series on the bypass branch, the inlet of the bypass capillary 140 is connected to the exhaust port of the compressor 110, and the outlet of the bypass expansion valve 150 is connected to the air intake of the compressor 110; the auxiliary throttling assembly is arranged on the refrigerant pipe between the compressor 110 and the outdoor heat exchanger 180, the inlet of the auxiliary throttling assembly is connected to the outlet of the outdoor heat exchanger 180, and the outlet of the auxiliary throttling assembly is connected to the air intake of the compressor 110 and the outlet of the bypass branch, and the auxiliary throttling assembly includes a defrost capillary 160 and a solenoid valve 170, and the defrost capillary 160 and the solenoid valve 170 are arranged in parallel. The defrost temperature sensor 210 is arranged on the refrigerant pipe between the main expansion valve 190 and the outdoor heat exchanger 180.

[0022] Specifically, the discharge pipe of the compressor 110 is bifurcated to form a branch, with a four-way valve 130 on one side and a capillary tube 140 on the branch side. The loop of the intake air returning to the compressor 110 through the bypass expansion valve 150 is a bypass loop, and a parallel loop of the solenoid valve 170 and the defrost capillary tube 160 is added between the four-way valve 130 and the intake air of the compressor 110.

[0023] Preferably, by forming a bypass loop, an auxiliary throttling component is arranged on the refrigerant pipe between the compressor 110 and the outdoor heat exchanger 180, and the inlet of the auxiliary throttling component is connected to the outlet of the outdoor heat exchanger 180, and the outlet of the auxiliary throttling component is connected to the air intake of the compressor 110 and the outlet of the bypass branch. Through this arrangement, the air-conditioning system can perform defrosting operation under continuous heating. Compared with the traditional air-conditioning heating cycle system, this structural arrangement makes the failure probability of the compressor 110 lower, and it can also operate defrosting during heating, which can better inhibit the growth of frost. Compared with the traditional defrosting, the defrosting ability is better, and the normal heating operation of the air-conditioning system can be better guaranteed. At the same time, this method has a simpler structure and lower cost. A defrost capillary 160 is also provided, which can better reduce the pressure of the refrigerant whose heat is taken away by the outdoor heat exchanger 180, thereby ensuring that the refrigerant can be better sucked into the compressor 110, thereby better reducing the failure rate of the compressor 110. At the same time, a defrost temperature sensor 210 is provided, and the temperature of the pipeline between the outdoor heat exchanger 180 and the main expansion valve 190 is detected by the defrost temperature sensor 210, thereby enabling better control of the state in the air-conditioning system, ensuring that the air-conditioning system can be better defrosted, and making the heating use of the air-conditioning system more reasonable and sustainable.

[0024] See also Figure 2-4 The present invention also provides a continuous heating control method, which is applied to the above-mentioned air conditioning heating cycle system, and the control method includes: Step S100: acquiring the outdoor air temperature as a first temperature value; acquiring the temperature detected by the defrost temperature sensor as a second temperature value; Step S200: Determine a target defrost mode that the air conditioner is to enter from among a plurality of defrost modes according to the first temperature value and the second temperature value.

[0025] Specifically, firstly, the external environment temperature, that is, the outdoor air temperature, is obtained by a set temperature sensor to obtain a first temperature value, and then the temperature of the pipeline between the outdoor heat exchanger and the main expansion valve, that is, the second temperature value, is detected by a defrost temperature sensor.

[0026] Further, it is determined that the second temperature value falls within the first threshold interval and the second threshold interval, wherein both threshold intervals are manually set values. For example, the external ambient temperature is 7°C, the first threshold interval is -8°C~0°C, and the second threshold interval is below -8°C. Specifically, in the first threshold interval, it is determined to be a continuous heating and defrosting mode, then the solenoid valve is closed at this time, and the compressor maintains the first frequency operation, the first frequency is a manually set value, and is adjusted according to the actual machine, and is 60Hz as an example here. At the same time, the four-way valve is to connect the compressor exhaust and the maintenance valve (gas side) (heating operation side), the main expansion valve is fully opened, the outdoor fan stops, and the indoor fan sets the air volume to a low gear speed. At the same time, the exhaust temperature of the compressor is obtained through the temperature sensor, and the bypass expansion valve is controlled according to the exhaust temperature of the compressor as a feedback amount, so that the exhaust temperature of the compressor is controlled at the first threshold through the bypass expansion valve, wherein the first threshold is a manually set value, and is adjusted according to the actual machine, and is 55°C as an example.

[0027] Furthermore, when the second temperature value falls into the second threshold interval, it means that the continuous heating defrosting capacity is insufficient, the frost grows, and it is necessary to enter the reverse cycle defrosting mode. At this time, the main expansion valve (SH control) and the solenoid valve are open, and the bypass expansion valve is fully closed.

[0028] Furthermore, when the second temperature value is greater than the temperature threshold, the defrost ends and enters the normal heating mode, or the defrost mode is exited after entering the continuous heating and defrost mode for the first time and the normal heating mode is entered, where the first time is a manually set value and can be adjusted according to the actual machine, for example 5 minutes.

[0029] Specifically, the refrigerant circulating in the pipeline is a high-pressure refrigerant with a temperature of 35°C to 40°C.

[0030] Preferably, by setting the outdoor air temperature and the temperature detected by the defrost temperature sensor as conditions for adjusting the air conditioner to enter the target defrost mode, the air conditioner can enter the corresponding target defrost mode under more appropriate circumstances, thereby better defrosting the current air conditioner, enabling the air conditioner to better heat, while ensuring the normal operation of the compressor, thereby enabling the air conditioner to operate more stably and ensuring the user experience.

[0031] Specifically, the target defrost mode includes: a continuous heating defrost mode and a reverse cycle defrost mode.

[0032] Preferably, by providing a continuous heating defrost mode and a reverse cycle defrost mode, the current air-conditioning system situation can be better controlled through different defrost modes, ensuring that the frost generated during the operation of the air conditioner can be better eliminated. At the same time, the continuous heating defrost mode can defrost when the air-conditioning system is continuously heating, ensuring the continuous operation of the air-conditioning heating without stopping, which can better improve the user experience.

[0033] Specifically, according to the first temperature value and the second temperature value, determining the target defrost mode that the air conditioner enters among multiple defrost modes also includes: according to the second temperature value, determining, among multiple temperature threshold intervals, the temperature threshold interval into which the second temperature value falls; and determining the target defrost mode of the air conditioner according to the temperature threshold interval.

[0034] Preferably, the corresponding temperature interval in which the current second temperature value is located is determined by setting multiple temperature threshold intervals, and then the target defrost mode is determined by the temperature threshold interval. In this way, the selection of the target defrost mode can be more accurate, which ensures that the state differentiation of the air-conditioning system is more refined, and the current state can be better adjusted and controlled, thereby ensuring the stable heating of the air-conditioning system.

[0035] Specifically, determining the target defrost mode of the air conditioner according to the temperature range also includes: when the second temperature value falls within the first threshold range, determining the target defrost mode of the air conditioner to be a continuous heating defrost mode; wherein the continuous heating defrost mode includes: controlling the solenoid valve to close, controlling the main expansion valve to fully open, and controlling the bypass expansion valve to be turned on according to the second temperature value.

[0036] Preferably, the continuous heating and defrosting mode is selected by setting the second temperature value in the first threshold range, and the air conditioner is able to defrost during continuous heating by closing the solenoid valve, so that the air conditioning system does not need to turn off the heating mode for defrosting, thereby ensuring the continuous operation of the air conditioning system during heating, improving the user experience and the practicality of the air conditioning system.

[0037] Specifically, the continuous heating and defrosting mode also includes: controlling the compressor to maintain the first frequency operation; controlling the four-way valve to connect to the indoor unit, and controlling the main expansion valve to be fully opened; and obtaining the exhaust temperature of the compressor, and controlling the opening of the bypass expansion valve according to the exhaust temperature of the compressor.

[0038] Preferably, the compressor frequency is controlled to remain stable in the continuous heating and defrosting mode, and the main expansion valve is fully opened, so that the state of the air-conditioning system is more stable during continuous heating and defrosting. At the same time, the bypass expansion valve is controlled according to the exhaust temperature of the compressor, so as to ensure the reliability of the compressor and maintain the exhaust temperature of the compressor required for heating, thereby improving the stability of the air-conditioning system.

[0039] Specifically, obtaining the exhaust temperature of the compressor, and controlling the opening of the bypass expansion valve according to the exhaust temperature of the compressor also includes: when the exhaust temperature of the compressor is in a first temperature range, maintaining the opening of the bypass expansion valve unchanged; when the exhaust temperature of the compressor is lower than the first temperature range, increasing the opening of the bypass expansion valve; when the exhaust temperature of the row of compressors is higher than the first temperature range, reducing the opening of the bypass expansion valve.

[0040] The first temperature range is a manually set value and can be changed according to actual conditions.

[0041] Preferably, the opening of the bypass expansion valve is controlled according to the exhaust temperature of the compressor to ensure the stability of the exhaust temperature of the compressor, making the operation of the compressor more stable, thereby making the defrosting and heating operations more stable, reducing the probability of compressor failure, and thus better ensuring the stable operation of the air-conditioning system, thereby providing users with a better experience and improving the practicality of the air conditioner.

[0042] Specifically, determining the target defrost mode of the air conditioner according to the temperature range also includes: when the second temperature value falls into the second threshold range, determining the target defrost mode of the air conditioner to be a reverse cycle defrost mode; wherein, the continuous heating defrost mode includes: controlling the solenoid valve to open according to the second temperature value, and fully closing the bypass expansion valve.

[0043] Preferably, by setting the second temperature value to be within the second threshold interval, the air conditioner is controlled to enter the reverse cycle defrost mode, the solenoid valve is opened and the bypass expansion valve is closed, thereby improving the defrost capacity of the air conditioner, ensuring that the air conditioner can be defrosted quickly in a low temperature environment, and ensuring the air conditioning system's ability to cope with different environments, thereby ensuring the user's heating experience.

[0044] Specifically, the control method also includes: when the second temperature value is greater than the temperature threshold, controlling the air conditioner to execute the conventional heating mode; and / or, when the air conditioner enters the continuous heating and defrosting mode for a first time, controlling the air conditioner to execute the conventional heating mode.

[0045] Specifically, the temperature threshold is a manually set value, which can be adjusted according to actual conditions, and 10° C. can be taken here.

[0046] Preferably, by setting the normal heating mode to be entered when the second temperature value is greater than the temperature threshold, it is indicated that the air conditioner defrost is completed at this temperature and there is no need to continue defrosting, thereby reducing the power usage and thus reducing the energy consumption of the air conditioner. At the same time, it is also set that the air conditioner enters the normal heating mode after entering the continuous heating defrost mode for a first time. In this way, the continuous heating defrost mode is prevented from being entered for too long, thereby affecting the normal operation of the air conditioning system.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning heating cycle system, comprising a compressor (110), an indoor heat exchanger (200), a main expansion valve (190), and an outdoor heat exchanger (180), wherein the compressor (110), the indoor heat exchanger (200), the main expansion valve (190), and the outdoor heat exchanger (180) are sequentially connected through a refrigerant pipe to form a basic circulation loop, characterized in that: The air conditioning heating cycle system also includes a bypass capillary tube (140), a bypass expansion valve (150), an auxiliary throttling component, and a defrosting temperature sensor (210); A bypass branch is arranged in parallel on one side of the compressor (110), the inlet of the bypass branch is connected to the exhaust port of the compressor (110), and the outlet of the bypass branch is connected to the intake port of the compressor (110); the bypass capillary tube (140) and the bypass expansion valve (150) are arranged in series on the bypass branch, the inlet of the bypass capillary tube (140) is connected to the exhaust port of the compressor (110), and the outlet of the bypass expansion valve (150) is connected to the intake port of the compressor (110); The auxiliary throttling component is arranged on the refrigerant pipe between the compressor (110) and the outdoor heat exchanger (180), the inlet of the auxiliary throttling component is connected to the outlet of the outdoor heat exchanger (180), and the outlet of the auxiliary throttling component is connected to the suction port of the compressor (110) and the outlet of the bypass branch, and the auxiliary throttling component includes a defrost capillary (160) and a solenoid valve (170), and the defrost capillary (160) and the solenoid valve (170) are arranged in parallel. The defrost temperature sensor (210) is arranged on the refrigerant pipe between the main expansion valve (190) and the outdoor heat exchanger (180).

2. A continuous heating control method, the control method is applied to the air conditioning heating cycle system according to claim 1, characterized in that: The control method comprises: Obtaining the outdoor air temperature as a first temperature value; Acquire the temperature detected by the defrost temperature sensor as a second temperature value; According to the first temperature value and the second temperature value, determining a target defrost mode that the air conditioner is to enter among a plurality of defrost modes; The target defrost mode includes: a continuous heating defrost mode and a reverse cycle defrost mode.

3. The continuous heating control method according to claim 2, characterized in that: The step of determining a target defrost mode to be entered by the air conditioner from among a plurality of defrost modes according to the first temperature value and the second temperature value further comprises: Determining a plurality of temperature threshold intervals according to the first temperature value, wherein the plurality of temperature threshold intervals increase as the first temperature value increases; According to the second temperature value, determining, among the multiple temperature threshold intervals, a temperature threshold interval into which the second temperature value falls; A target defrost mode of the air conditioner is determined according to the temperature threshold interval.

4. The continuous heating control method according to claim 3, characterized in that: The plurality of temperature threshold intervals include a first threshold interval and a second threshold interval, and a left end point of the first threshold interval is greater than a right end point of the second threshold interval, and determining a target defrost mode of the air conditioner according to the temperature threshold intervals further includes: When the second temperature value falls within the first threshold value interval, determining that the target defrost mode of the air conditioner is the continuous heating and defrost mode; When the second temperature value falls within the second threshold value interval, determining that the target defrost mode of the air conditioner is a reverse cycle defrost mode; Wherein, the continuous heating and defrosting mode includes: controlling the solenoid valve to be closed, controlling the main expansion valve to be fully opened, and controlling the bypass expansion valve to be opened.

5. The continuous heating control method according to claim 4, characterized in that: The continuous heating and defrosting mode also includes: The exhaust temperature of the compressor is obtained, and the opening of the bypass expansion valve is controlled according to the exhaust temperature of the compressor.

6. The continuous heating control method according to claim 5, characterized in that: The step of obtaining the exhaust temperature of the compressor and controlling the opening of the bypass expansion valve according to the exhaust temperature of the compressor further includes: When the exhaust temperature of the compressor is in the first temperature range, the opening of the bypass expansion valve is maintained unchanged; When the exhaust temperature of the compressor is lower than the first temperature range, increasing the opening of the bypass expansion valve; When the exhaust temperature of the row compressor is higher than the first temperature range, the opening degree of the bypass expansion valve is reduced.

7. The continuous heating control method according to claim 4, characterized in that: The control method further comprises: When the second temperature value is greater than a temperature threshold, the air conditioner is controlled to execute a conventional heating mode; and / or, When the air conditioner enters the continuous heating and defrosting mode for a first period of time, the air conditioner is controlled to execute a normal heating mode.

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