Hot gas defrosting assembly, defrosting method thereof and air conditioning system

Abstract

The application provides a hot gas defrosting assembly, a defrosting method thereof and an air conditioning system. The hot gas defrosting assembly comprises a refrigerant circulation loop, an electric appliance box, and a first bypass. The refrigerant circulation loop comprises a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger through which the refrigerant circulates in sequence in a heating mode. The electric appliance box is internally provided with a circuit board. The first bypass is arranged in parallel with the throttling device and penetrates through the electric appliance box to take away the heat generated by the circuit board. The first bypass is arranged in parallel with the throttling device, the heat generated by the circuit board in the electric appliance box is utilized to heat the refrigerant in the first bypass, the temperature of the refrigerant entering the outdoor heat exchanger is increased, the defrosting time is shortened, and the defrosting efficiency of the surface of the outdoor heat exchanger is increased.

Description

Technical Field

[0001] This application belongs to the field of air conditioning system technology, specifically relating to a hot gas defrosting component, its defrosting method, and an air conditioning system. Background Technology

[0002] During the heating season, when the outdoor environment is cold and humid, frost easily forms on the fins of the outdoor heat exchanger when the outer ring temperature is below the dew point and less than 0°C. This not only increases wind resistance, reduces the outdoor air outlet area and airflow, but also creates additional thermal resistance, worsening the heat transfer effect. Therefore, defrosting the outdoor heat exchanger is necessary during the heating season.

[0003] Currently, the two most commonly used defrosting methods are as follows:

[0004] 1. Reverse Circulation Defrosting: This defrosting method uses a four-way valve to reverse the flow, changing the process from the indoor heat exchanger releasing heat to the indoor unit to absorbing heat from the indoor unit. The refrigerant absorbs heat through evaporation indoors and further increases its enthalpy through the compressor, effectively defrosting the outdoor heat exchanger. However, this method also has drawbacks:

[0005] ① Switching from a heating cycle to a cooling cycle lowers the temperature of the refrigerant flowing through the indoor side, which in turn lowers the temperature of the heat exchanger on the indoor side. This radiative heat exchange with the indoor environment further reduces the indoor temperature.

[0006] ② After switching back to heating mode from defrost mode, the anti-cold air protection will prevent hot air from blowing out of the room for a period of time. ③ Frequent use of the four-way valve to switch airflow direction will generate noise and reduce the lifespan of components.

[0007] 2. Hot gas defrosting: Compared to the conventional reverse defrosting mentioned above, this defrosting method switches from heating mode to defrosting mode by adjusting the throttle valve opening to the maximum. This prevents the refrigerant flowing to the outdoor heat exchanger from being a low-temperature, low-pressure two-phase refrigerant. Instead, the refrigerant flowing out of the indoor heat exchanger continues to flow to the outdoor side for heat release and defrosting. Compared to the conventional reverse defrosting, this method does not require switching the refrigerant flow through a four-way valve, does not generate noise, effectively ensures the equipment's lifespan, and does not have cold air protection. However, it still has disadvantages such as long defrosting time and large indoor temperature fluctuations. Summary of the Invention

[0008] Therefore, this application provides a hot air defrosting component, a defrosting method, and an air conditioning system, which can solve the problems of long hot air defrosting time and large indoor temperature fluctuations in the prior art.

[0009] To address the aforementioned problems, this application provides a hot gas defrosting assembly, comprising:

[0010] The refrigerant circulation loop includes the compressor, indoor heat exchanger, expansion valve and outdoor heat exchanger through which the refrigerant circulates in sequence during heating mode;

[0011] The electrical box contains a circuit board.

[0012] A first bypass is connected in parallel with the throttle, and the first bypass passes through the electrical box to carry away the heat generated by the circuit board.

[0013] In some implementations...

[0014] Also includes:

[0015] A heat storage device, which covers part of the piping connecting the compressor and the indoor heat exchanger;

[0016] The second bypass has its inlet and outlet connected to the pipeline between the outlet of the first bypass and the inlet of the outdoor heat exchanger; the second bypass passes through the heat storage device.

[0017] In some implementations...

[0018] Also includes:

[0019] The third bypass has an inlet connected to the compressor outlet and an outlet connected to the outlet of the indoor heat exchanger.

[0020] The third bypass is installed in the heat storage device.

[0021] In some implementations...

[0022] A fourth bypass is provided between the compressor and the indoor heat exchanger, and the fourth bypass is connected in parallel with the heat storage device.

[0023] According to another aspect of this application, a defrosting method for the hot gas defrosting assembly as described above is provided, comprising:

[0024] The refrigerant temperature at the first bypass inlet is detected as T. E And the temperature inside the electrical box is detected as T. 盒 ;

[0025] If T 盒 Greater than T E The first bypass is opened, and the refrigerant absorbs heat from the circuit board through the first bypass before entering the outdoor heat exchanger.

[0026] In some implementations...

[0027] When the hot gas defrosting assembly is equipped with a second bypass, the pipe temperature of the outdoor heat exchanger is detected.

[0028] When the pipe temperature is lower than the first preset value, the second bypass is opened, and the refrigerant absorbs the heat from the heat storage device through the second bypass and then enters the outdoor heat exchanger.

[0029] In some implementations...

[0030] After the refrigerant absorbs heat from the circuit board, the temperature of the refrigerant at the first bypass outlet is detected as T. A ;

[0031] If T A If the temperature is lower than that of the heat storage device, the refrigerant absorbs heat from the heat storage device via the second bypass and finally enters the outdoor heat exchanger.

[0032] If T A If the temperature is higher than that of the heat storage device, the refrigerant is directly fed into the outdoor heat exchanger.

[0033] In some implementations...

[0034] When the hot gas defrosting assembly includes a third bypass, the temperature of the heat storage device is detected as T. 蓄 The refrigerant temperature at the compressor discharge port is detected as T. B ;

[0035] If T 蓄 Greater than T B The refrigerant discharged from the compressor flows to the inlet end of the indoor heat exchanger via the heat storage device;

[0036] If T 蓄 Less than T B The refrigerant discharged from the compressor flows to the outlet end of the indoor heat exchanger via the third bypass.

[0037] In some implementations...

[0038] When the pipe temperature is greater than a first preset value but less than a second preset value, the third bypass is activated.

[0039] According to another aspect of this application, an air conditioning system is provided, including a hot gas defrosting assembly as described above or a hot gas defrosting assembly operating according to the defrosting method described above.

[0040] This application provides a hot gas defrosting assembly, comprising: a refrigerant circulation loop, including a compressor, an indoor heat exchanger, a throttle valve, and an outdoor heat exchanger through which the refrigerant circulates in sequence during heating mode; an electrical box containing a circuit board; and a first bypass connected in parallel with the throttle valve, the first bypass passing through the electrical box to carry away the heat generated by the circuit board.

[0041] This application has the following beneficial effects:

[0042] A first bypass is connected in parallel with the throttle. The heat generated by the circuit board in the electrical box is used to heat the refrigerant in the first bypass, thereby increasing the temperature of the refrigerant entering the outdoor heat exchanger, shortening the defrosting time, and increasing the defrosting efficiency of the outdoor heat exchanger surface. Attached Figure Description

[0043] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the air conditioning system according to an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of the heating circulation flow path of the air conditioning system in the present application embodiment.

[0046] Figure 3 This is a flow diagram of the heat storage process of the air conditioning system in an embodiment of this application;

[0047] Figure 4 This is a flow diagram of the first type of hot gas defrosting operation of the air conditioning system according to an embodiment of this application;

[0048] Figure 5 This is a flow diagram illustrating the second type of hot gas defrosting operation in the air conditioning system according to an embodiment of this application.

[0049] Figure 6 This is a flow diagram of the third type of hot gas defrosting operation for the air conditioning system in this application embodiment;

[0050] Figure 7 This is a flow diagram of the fourth type of hot gas defrosting operation for the air conditioning system in this application embodiment.

[0051] The reference numerals in the attached figures are as follows:

[0052] 1. Outdoor heat exchanger; 2. Indoor heat exchanger; 3. Compressor; 4. Four-way valve; 5. First solenoid valve; 6. Second solenoid valve; 7. Third solenoid valve; 8. Fourth solenoid valve; 9. Fifth solenoid valve; 10. Sixth solenoid valve; 11. Seventh solenoid valve; 12. Circuit board; 13. Heat storage device; 14. Throttling device; 15. Indoor fan; 16. First bypass; 17. Second bypass; 18. Third bypass; 19. Fourth bypass. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0054] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0057] See also Figures 1 to 7 As shown, according to an embodiment of this application, a hot gas defrosting assembly includes:

[0058] The refrigerant circulation loop includes the compressor 3, indoor heat exchanger 2, throttle valve 14 and outdoor heat exchanger 1 through which the refrigerant circulates in sequence during the heating mode;

[0059] An electrical box containing a circuit board 12;

[0060] The first bypass 16 is connected in parallel with the throttle 14, and the first bypass 16 passes through the electrical box to carry away the heat generated by the circuit board 12.

[0061] This application has a first bypass 16 connected in parallel with the throttle 14, utilizing an electrical box ( Figure 1 The heat generated by the circuit board 12 (shown in the dashed box) heats the refrigerant in the first bypass 16, thereby increasing the temperature of the refrigerant entering the outdoor heat exchanger, shortening the defrosting time, and increasing the defrosting efficiency of the outdoor heat exchanger surface.

[0062] For air conditioning systems, the outdoor unit contains an electrical box that generates a lot of heat, especially the circuit board 12 inside the electrical box. During operation, it generates a lot of heat, and the high temperature will affect the service life of the circuit board 12. This application sets up a first bypass 16 connected in parallel with the throttle, and uses the refrigerant in the first bypass 16 to remove the heat generated by the circuit board 12, so as to increase the temperature of the refrigerant entering the outdoor heat exchanger 1, thereby increasing the heat exchange between the refrigerant and the outdoor heat exchanger 1, reducing the defrosting time, and increasing the defrosting effect.

[0063] Meanwhile, the first bypass 16 is connected in parallel with the throttle 14 to reduce the resistance encountered by the refrigerant when passing through the throttle 14, accelerate the flow of the refrigerant, and reduce the temperature drop of the refrigerant when it flows through the throttle 14, which is more conducive to improving the defrosting effect.

[0064] In some implementations...

[0065] Also includes:

[0066] The heat storage device 13 covers part of the pipeline connecting the compressor 3 and the indoor heat exchanger 2;

[0067] The second bypass 17 has its inlet and outlet connected to the pipeline between the outlet of the first bypass 16 and the inlet of the outdoor heat exchanger 1; the second bypass 17 passes through the heat storage device 13.

[0068] A heat storage device 13 is installed on a portion of the pipeline between the outlet of the compressor 3 and the indoor heat exchanger 2 to absorb the heat from the high-temperature exhaust of the compressor 3 and store the heat. The refrigerant in the second bypass 17 through the heat storage device 13 can be heated by the heat stored in the heat storage device 13, thereby increasing its temperature. The heated refrigerant enters the outdoor heat exchanger 1, which further increases the temperature of the refrigerant entering the outdoor heat exchanger 1 in the hot gas defrosting mode, thereby increasing the defrosting efficiency.

[0069] By adding a heat storage device 13 to a portion of the pipeline between the compressor 3 and the indoor heat exchanger 2, the heat storage device 13 can store heat in heating mode. When the air conditioning system switches to hot gas defrosting mode, at least part of the refrigerant entering the outdoor heat exchanger 1 flows through the heat storage device 13, thus being heated by the heat storage device 13 and its temperature rises before entering the outdoor heat exchanger 1, thereby increasing the temperature of the inner pipe of the outdoor heat exchanger 1 and improving defrosting efficiency.

[0070] Correspondingly, the heat stored in the heat storage device 13 in the heating mode will be released to the refrigerant when switching to the hot gas defrosting mode, which can also increase the temperature of the refrigerant entering the indoor heat exchanger 2. Therefore, the indoor ambient temperature can be increased during the defrosting process, and the indoor thermal comfort can be improved.

[0071] In some implementations...

[0072] Also includes:

[0073] The third bypass 18 has an inlet connected to the outlet of the compressor 3 and an outlet connected to the outlet end of the indoor heat exchanger 2.

[0074] The third bypass 18 is installed in the heat storage device 13.

[0075] Since the refrigerant discharged from the compressor 3 is cooled by the heat storage device 13, if the temperature is too low, it will affect the indoor thermal comfort. At this time, the refrigerant can be directly sent to the outlet end of the indoor heat exchanger 2 through the third bypass 18 to reduce the fluctuation of indoor ambient temperature.

[0076] In some implementations...

[0077] A fourth bypass 19 is provided between the compressor 3 and the indoor heat exchanger 2, and the fourth bypass 19 is connected in parallel with the heat storage device.

[0078] A fourth bypass 19 is provided between the compressor 3 and the indoor heat exchanger 2, which is connected in parallel with the heat storage device 13. In this way, if the exhaust temperature of the compressor 3 is lower than the temperature of the heat storage device 13, it can only go through the fourth bypass 19 without passing through the heat storage device 13, thus realizing the circulation path of heating mode and hot gas defrosting mode.

[0079] The refrigerant circulation loop of this application may also include a four-way valve assembly, through which the compressor 3 is connected to the indoor heat exchanger 2 and the outdoor heat exchanger 1.

[0080] A four-way valve assembly (specifically including a four-way valve 4) is installed in the refrigerant circulation loop to change the direction of the compressor 3's exhaust, so that the entire refrigerant circulation loop completes the refrigeration mode circulation flow, that is, the compressor 3 exhaust flows through the outdoor heat exchanger 1, the throttle valve 14, and the indoor heat exchanger 2 in the circulation direction.

[0081] The aforementioned heat storage device 13 includes a phase change heat storage material layer, which covers a portion of the pipeline through which the refrigerant flows.

[0082] The heat storage device 13 uses a phase change heat storage material layer. It utilizes the phase change nature of the phase change heat storage material to store and release heat. It exchanges heat with the exhaust pipe of the compressor 3 and the second bypass 17 to achieve an effective heat transfer process and ensure that the defrosting process is completed smoothly.

[0083] Phase change heat storage materials include paraffin wax, ester salts, etc. Specifically, a phase change material can be filled into a sealed container, while the refrigerant pipeline and the second bypass 17 pass through the sealed container.

[0084] Phase change materials (PCCs) possess advantages such as high thermal inertia and high latent heat, enabling them to absorb and store heat when the ambient temperature is high and release heat when the ambient temperature is low. By applying PCCs to the high-temperature exhaust gas of the compressor and combining this with the technology of refrigerant absorbing waste heat from the circuit board, it is possible to reduce indoor temperature fluctuations, improve indoor temperature comfort, and effectively defrost during the defrosting mode of the heater.

[0085] In the above structure, solenoid valves are installed on the corresponding pipelines to regulate the opening and closing of the pipelines. The installation method of the solenoid valves is a conventional structure and will not be described in detail here.

[0086] According to another aspect of this application, a defrosting method for the hot gas defrosting assembly as described above is provided, comprising:

[0087] When a first bypass 16 is provided, the refrigerant temperature at the inlet of the first bypass 16 is detected as T. E And the temperature inside the electrical box is detected as T. 盒 ;

[0088] If T 盒 Greater than T E The first bypass 16 is opened, and the refrigerant absorbs the heat from the circuit board 12 via the second bypass 17 before entering the outdoor heat exchanger 1.

[0089] In the structure with the first bypass 16, a corresponding temperature needs to be detected and determined. The first bypass 16 is only opened to utilize the heat from the circuit board 12 when the temperature inside the electrical box is higher than the refrigerant temperature at the inlet of the first bypass 16. If the temperature inside the electrical box is lower than the inlet temperature of the first bypass 16, the first bypass 16 is closed, without needing to lower the refrigerant temperature and thus affecting the defrosting effect.

[0090] In some implementations...

[0091] When the hot gas defrosting assembly is equipped with a second bypass 17, the pipe temperature of the outdoor heat exchanger 1 is detected.

[0092] When the pipe temperature is less than the first preset value, the second bypass 17 is opened, and the refrigerant absorbs the heat from the heat storage device 13 through the second bypass 17 and then enters the outdoor heat exchanger 1.

[0093] When the pipe temperature of the outdoor heat exchanger 1 is lower than the first preset value, which is usually below zero degrees Celsius, the surface of the outdoor heat exchanger 1 is prone to frost formation. At this time, by opening the second bypass 17, the refrigerant can flow through the second bypass 17. After absorbing the heat from the heat storage device 13, the refrigerant temperature is raised and then enters the outdoor heat exchanger 1 to perform the defrosting operation.

[0094] If the pipe temperature of outdoor heat exchanger 1 is high, frost formation will not occur, and the air conditioning system will operate in heating circulation mode. To ensure the thermal comfort of indoor users and maintain the indoor temperature, the refrigerant does not need to consume its own heat to store heat in the phase change heat storage material. Therefore, except for the expansion valve 14, which continues to operate, all other solenoid valves remain closed. The refrigerant circulation path at this time is as follows: Figure 2 As shown, this achieves a normal heating cycle.

[0095] In some implementations...

[0096] After the refrigerant absorbs heat from the circuit board 12, the temperature of the refrigerant at the outlet of the first bypass 16 is detected as T. A ;

[0097] If T A If the temperature is lower than that of the heat storage device 13, the refrigerant will absorb the heat from the heat storage device 13 via the second bypass 17 and finally enter the outdoor heat exchanger 1.

[0098] If T A If the temperature is higher than that of the heat storage device 13, the refrigerant is directly fed into the outdoor heat exchanger 1.

[0099] For the refrigerant to absorb the heat dissipated by the circuit board 12 through the first bypass 16, the outlet temperature of the first bypass 16 also needs to be detected to compare with the temperature of the heat storage device 13. If it is lower than the temperature of the heat storage device 13, the refrigerant can absorb more heat from the heat storage device 13; if it is higher than the temperature of the heat storage device 13, there is no need for heat exchange through the second bypass 17 and the heat storage device 13.

[0100] In some implementations...

[0101] When the hot gas defrosting assembly includes a third bypass 18, the temperature of the heat storage device 13 is detected as T. 蓄The refrigerant temperature at the discharge port of compressor 3 is detected as T. B ;

[0102] If T 蓄 Greater than T B The refrigerant discharged from the compressor flows to the inlet end of the indoor heat exchanger via the heat storage device;

[0103] If T 蓄 Less than T B The refrigerant discharged from the compressor flows to the outlet end of the indoor heat exchanger via the third bypass 18.

[0104] By detecting the temperature of the heat storage device 13 and the temperature of the compressor 3 discharge port, the flow status of the refrigerant discharged by the compressor 3 is determined, so as to provide a more comfortable indoor environment.

[0105] In some implementations...

[0106] When the pipe temperature is greater than the first preset value but less than the second preset value, the third bypass 18 is activated.

[0107] If the pipe temperature of the outdoor heat exchanger 1 is higher than the first preset value that may cause frost to form, but lower than the second preset value, the second preset value may be the outdoor heat exchanger 1 starting to frost, but the air conditioning system has not yet switched to defrosting mode. At this time, the air conditioning system can heat the heat storage device 13 from the heating mode, so that the heat storage device 13 can store heat.

[0108] The above-mentioned situations can be used in combination, as shown in the following specific examples:

[0109] 1. The parameters used in the following embodiments are explained as follows:

[0110] T A —The temperature at the inlet of pipe C (at point A) is monitored in real time, in °C;

[0111] T B —Real-time monitoring of the temperature at the compressor's exhaust port 3 (point B), unit: °C;

[0112] T E —Real-time monitored temperature before throttle 14 (at point E), unit: °C;

[0113] T 外管 —Real-time monitoring of the pipe temperature of outdoor heat exchanger 1, unit: °C;

[0114] T 外管设 —The set pipe temperature of outdoor heat exchanger 1, when T 外管 Below this temperature, but above T 外管0At this time (generally 0℃ is acceptable), it indicates that a certain thickness of frost has condensed on the outdoor unit, but the system has not yet switched to defrosting mode. At this point, the system switches from heating cycle mode to phase change heat storage mode using phase change heat storage materials. The unit is ℃; this is the second preset temperature.

[0115] T 外管0 —The set temperature of outdoor heat exchanger tube 1 (generally -4℃) when T 外管 When the temperature is below this, the system begins the defrosting cycle. The unit is °C; this is the first preset temperature.

[0116] T 内管 —Real-time monitoring of the pipe temperature of indoor heat exchanger 2, unit: °C;

[0117] T 盒 —Real-time monitoring of the temperature inside the outdoor unit's electrical box, unit: °C;

[0118] T 内管设 —The set temperature of the indoor heat exchanger tube 2, when T 内管 When the temperature exceeds this value, the indoor fan can be turned on at 15°C to exchange heat with the room. (Unit: °C)

[0119] T 蓄 —The temperature of the heat storage material under real-time monitoring, in °C;

[0120] ΔT 内 —The temperature difference between the indoor heat exchanger tube 2 and the indoor environment is set. The indoor fan 15 is turned on to exchange heat with the indoor environment by calculating the real-time temperature difference between the indoor heat exchanger tube 2 and the indoor environment and this set temperature difference. Unit: °C.

[0121] The heat storage device 13 is equipped with three heat exchange tubes, namely:

[0122] The first heat exchange tube (tube a) is connected to the exhaust port B of the compressor 3 and the inlet C of the indoor heat exchanger 2, and is controlled by the second solenoid valve 6 and the fourth solenoid valve 8.

[0123] The second heat exchange tube (tube b) is connected to the exhaust port B of the compressor 3 and the outlet D of the indoor heat exchanger 2 (i.e., the third bypass 18), and is controlled by the first solenoid valve 5 and the third solenoid valve 7.

[0124] The third heat exchange tube (tube c) is connected to point A and the inlet F of the outdoor heat exchanger 1 (i.e., the second bypass 17), and is controlled by the fifth solenoid valve 9 and the sixth solenoid valve 10.

[0125] A first bypass 16 is a pipe that passes through the circuit board 12 from before the throttle 14 (at point E) to after the throttle 14 (at point A), and a seventh solenoid valve 11 is installed on the first bypass 16 pipe.

[0126] Temperature sensors are installed at points A, B, F, outdoor heat exchanger 1, indoor heat exchanger 2, heat storage device 13, and circuit board 12 to detect temperature and control the refrigerant flow path of the system.

[0127] 2. As the heating time increases, frost begins to form on the outer surface of the heat exchange pipes inside outdoor heat exchanger 1, and the frost layer thickens over time, further causing the temperature of the outer pipes to decrease. When T... 外管0 <T 外管 <T 外管设 When the system enters defrost mode, it indicates that a certain thickness of frost has begun to condense on the outdoor unit, and the system is preparing to enter defrost mode. At this time, the first solenoid valve 5 and the third solenoid valve 7 are opened, while the remaining solenoid valves are closed. This allows a portion of the high-temperature refrigerant discharged from the compressor 3 to flow through the second heat exchange tube to the heat storage material, where it begins to store heat. This portion of the refrigerant, having consumed its own heat, will not pass through the indoor heat exchanger 2, thus avoiding any impact on indoor thermal comfort. The refrigerant cycle during this heat storage mode phase is described in [link to documentation]. Figure 3 .

[0128] When T 外管 <T 外管0 When the system enters hot gas defrosting mode, the first solenoid valve 5 and solenoid valve 7 are closed, and the T signal is detected. A T B T 外管 T 内管 T 盒 And T 蓄 The size of the valve controls the opening and closing of the remaining solenoid valves. Specific defrosting methods are categorized as follows:

[0129] Category 1: At this time, the temperature at the compressor's exhaust point (point B) is lower than the temperature of the phase change heat storage material (T). B <T 蓄 The second solenoid valve 6 and the fourth solenoid valve 8 are opened, allowing the refrigerant from the compressor 3 discharge port to pass through the first heat exchange tube to further absorb the residual heat from the phase change heat storage material and further increase the temperature of the refrigerant itself. At this time, the temperature can be adjusted according to T. E and T 盒 T A and T 蓄 The relative sizes of the valves are used to further control the opening and closing of the fifth solenoid valve 9, the sixth solenoid valve 10, and the seventh solenoid valve 11, and are further divided into categories 1-1 to 1-4:

[0130] Class 1-1: Under the condition of Class 1, if the temperature at point E before the throttle 14 is less than the temperature at point 12 on the circuit board (T) E <T 盒 And the temperature at point A is less than T. 蓄 (T A <T蓄 At this time: If the indoor fan 15 is turned on, the indoor ambient temperature will drop, reducing the user's thermal comfort. Therefore, the refrigerant does not perform its function of dissipating heat into the room. The indoor fan 15 is turned off, and the seventh solenoid valve 11, the fifth solenoid valve 9, and the sixth solenoid valve 10 are turned on. The refrigerant flowing out of the indoor heat exchanger 2 will absorb the residual heat emitted by the outdoor circuit board 12 and continue to absorb the remaining heat in the heat storage material through the third heat exchange tube, maximizing the absorption and utilization of residual heat in the system, and finally flowing into the outdoor heat exchanger 1 for defrosting. In this case, the refrigerant circulation is as follows: Figure 4 ;

[0131] Class 1-2: Under the condition of Class 1, if the temperature at point E before the throttle 14 is greater than the temperature at point 12 on the circuit board (T) E >T 盒 And the temperature at point A is less than T. 蓄 (T A <T 蓄 At this time: the seventh solenoid valve 11 is closed, and the fifth solenoid valve 9 and the sixth solenoid valve 10 are opened to prevent the refrigerant from releasing heat to the outdoor unit circuit board 12 and causing a safety hazard. At the same time, the residual heat in the heat accumulator continues to be recovered through the third heat exchange tube to increase the temperature of the refrigerant itself for defrosting. In this case, the refrigerant circulates, see Figure 5 ;

[0132] Class 1-3: Under the condition of Class 1, if the temperature at point E before the throttle 14 is less than the temperature at point 12 on the circuit board (T) E <T 盒 And the temperature at point A is greater than T. 蓄 (T A >T 蓄 At this time: The opposite of Class 1-2, the seventh solenoid valve 11 is opened, and the fifth solenoid valve 9 and the sixth solenoid valve 10 are closed to prevent the refrigerant from releasing heat to the heat storage material and losing heat. The refrigerant also absorbs residual heat from the circuit board 12 through the EA bypass branch, increasing its own heat for defrosting. In this case, the refrigerant circulates, see... Figure 6 ;

[0133] Class 1-4: Under the condition of Class 1, if the temperature at point E before the throttle 14 is greater than the temperature at point 12 on the circuit board (T) E >T 盒 And the temperature at point A is greater than T. 蓄 (T A >T 蓄 When the seventh solenoid valve 11, the fifth solenoid valve 9, and the sixth solenoid valve 10 are closed, the refrigerant will not lose heat to the heat storage material and the outdoor unit circuit board 12, thus avoiding safety hazards and heat loss. After flowing out of the indoor heat exchanger 2, it flows directly to the outdoor heat exchanger 1 for defrosting. In this case, the refrigerant circulates, see... Figure 7 .

[0134] Category 2: When the temperature at the discharge port of compressor 3 is greater than T 蓄 Time (T) B >T 蓄 If the second solenoid valve 6 and the fourth solenoid valve 8 are opened at this time, the refrigerant will release heat to the heat storage material, reducing the amount of heat exchanged between the refrigerant and the indoor environment, affecting the indoor temperature and reducing the thermal comfort of the indoor users. Therefore, the second solenoid valve 6 and the fourth solenoid valve 8 are closed. Based on this, it is still possible to determine the appropriate temperature based on T. E and T 盒 T A and T 蓄 The relative sizes of the valves are used to control the opening and closing of the fifth solenoid valve 9, the sixth solenoid valve 10, and the seventh solenoid valve 11, and are further divided into categories 2-1 to 2-4. Their specific implementation methods are similar to the functional implementation methods of categories 1-1 to 1-4.

[0135] Category 2-1: At this time, the second solenoid valve 6 and the fourth solenoid valve 8 are closed, and the opening status of the remaining valves in the system and the flow of refrigerant are similar to Category 1-1.

[0136] Category 2-2: At this time, the second solenoid valve 6 and the fourth solenoid valve 8 are closed, and the opening status of the remaining valves in the system and the flow of refrigerant are the same as in Category 1-2.

[0137] Category 2-3: At this time, the second solenoid valve 6 and the fourth solenoid valve 8 are closed, and the opening status of the remaining valves in the system and the flow of refrigerant are the same as in Category 1-3.

[0138] Category 2-4: At this time, the second solenoid valve 6 and the fourth solenoid valve 8 are closed, and the opening status of the remaining valves in the system and the flow of refrigerant are the same as in Category 1-4.

[0139] Additional explanation: T in all the above cases 内管设 >T 内 And the difference between the two is greater than ΔT 内 At this time, it can be assumed that after the indoor fan 15 is turned on, the indoor heat exchanger 2 can release heat into the room, fully meeting the thermal comfort needs of the indoor users. Therefore, the indoor fan 15 can be turned on. At this time, the refrigerant drawn from the compressor 3 exhaust port to the indoor heat exchanger 2 can provide heat to the room and raise the indoor ambient temperature. And when all the above conditions are met, T 内管设 >T 内 And the difference between the two is less than ΔT 内 Time or T 内管设 <T 内 At this time, it is believed that if the indoor fan 15 is turned on, the indoor heat exchanger 2 will not release enough heat into the room and may cause the indoor ambient temperature to drop, reducing the thermal comfort of the indoor users. Therefore, the indoor fan 15 is turned off.

[0140] According to another aspect of this application, an air conditioning system is provided, including a hot gas defrosting assembly as described above or a hot gas defrosting assembly operating according to the defrosting method described above.

[0141] It will be readily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

[0142] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above description is merely a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A defrosting method for a hot air defrosting assembly, characterized in that, The hot air defrosting assembly includes: The refrigerant circulation loop includes the compressor (3), indoor heat exchanger (2), throttle valve (14) and outdoor heat exchanger (1) through which the refrigerant circulates in sequence during the heating mode; An electrical box containing a circuit board (12); The first bypass (16) is connected in parallel with the throttle (14), and the first bypass (16) passes through the electrical box to carry away the heat generated by the circuit board (12); A heat storage device (13) covers part of the piping between the compressor (3) and the indoor heat exchanger (2); The third bypass (18) has an inlet connected to the outlet of the compressor (3) and an outlet connected to the outlet of the indoor heat exchanger (2); The third bypass (18) passes through the heat storage device (13); The defrosting method includes: The refrigerant temperature at the inlet of the first bypass (16) is detected as T. E And the temperature inside the electrical box is detected as T. 盒 ; If T 盒 Greater than T E The first bypass (16) is opened, and the refrigerant absorbs the heat of the circuit board (12) through the first bypass (16) before entering the outdoor heat exchanger (1). When the hot gas defrosting assembly includes a third bypass (18), the temperature of the heat storage device (13) is detected as T. 蓄 The refrigerant temperature at the discharge port of the compressor (3) is detected as T. B ; If T 蓄 Greater than T B The refrigerant discharged by the compressor (3) flows to the inlet end of the indoor heat exchanger (2) via the heat storage device (13); If T 蓄 Less than T B The refrigerant discharged from the compressor (3) flows to the outlet end of the indoor heat exchanger (2) via the third bypass (18).

2. The defrosting method of the hot gas defrosting assembly according to claim 1, characterized in that, A fourth bypass (19) is provided between the compressor (3) and the indoor heat exchanger (2), and the fourth bypass (19) is connected in parallel with the heat storage device (13).

3. The defrosting method according to claim 2, characterized in that: The hot air defrosting unit also includes: The second bypass (17) has its inlet and outlet connected to the pipeline between the outlet of the first bypass (16) and the inlet of the outdoor heat exchanger (1); the second bypass (17) is installed in the heat storage device (13); The defrosting method further includes: detecting the pipe temperature of the outdoor heat exchanger (1); When the pipe temperature is less than the first preset value, the second bypass (17) is opened, and the refrigerant absorbs the heat from the heat storage device (13) through the second bypass (17) and then enters the outdoor heat exchanger (1).

4. The defrosting method of the hot gas defrosting assembly according to claim 3, characterized in that: After the refrigerant absorbs heat from the circuit board (12), the temperature of the refrigerant at the outlet of the first bypass (16) is detected as T. A ; If T A If the temperature is lower than that of the heat storage device (13), the refrigerant will absorb the heat from the heat storage device (13) via the second bypass (17) and finally enter the outdoor heat exchanger (1). If T A If the temperature is greater than that of the heat storage device (13), the refrigerant is directly fed into the outdoor heat exchanger (1).

5. The defrosting method of the hot gas defrosting assembly according to claim 3, characterized in that: When the pipe temperature is greater than the first preset value but less than the second preset value, the third bypass (18) is opened.

6. An air conditioning system, characterized in that, Includes a hot gas defrosting assembly operating as described in any one of claims 1-5.

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