Defrosting assembly and air conditioning system

Abstract

The application provides a defrosting assembly and an air conditioning system. The defrosting assembly comprises a first communication pipeline, an inlet end of the first communication pipeline being communicated with an outlet of a compressor; a second communication pipeline, an inlet end of the second communication pipeline being communicated with an outlet of a condenser; an outlet end of the first communication pipeline being communicated with an outlet end of the second communication pipeline and being communicated to an inlet of an evaporator. The application mixes the high-temperature fluid discharged by the compressor and the fluid passing through the condenser and then sends the mixed fluid into the evaporator to perform a defrosting operation on the evaporator, so that the high-temperature gas discharged by the compressor is directly used to realize high-efficiency defrosting without stopping the compressor.

Description

Technical Field

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

[0002] When an air conditioning system is in heating mode, the outdoor heat exchanger acts as an evaporator. It needs to absorb heat when evaporating the refrigerant, and its surface temperature will reach below zero. Affected by the ambient temperature and humidity, frost will form on the surface. As the operating time increases, the frost layer becomes thicker and thicker, which will reduce the system's heat exchange capacity and thus affect the heating effect of the indoor unit.

[0003] Currently, a common defrosting method is reverse refrigeration defrosting. When the control system detects that defrosting conditions are met, the four-way valve reverses, switching the air conditioning system to cooling mode. The outdoor heat exchanger becomes a condenser, dissipating heat, and uses hot refrigerant to defrost it. This defrosting mode turns the indoor heat exchanger into an evaporator, significantly impacting indoor temperature and comfort. The four-way valve reversal at this time ensures the compressor suction end receives high-temperature, high-pressure gas, preventing excessive compressor load and necessitating compressor shutdown to balance the pressure between the two heat exchangers. Additionally, the compressor may start with liquid remaining after defrosting, significantly affecting reliability.

[0004] Another method uses hot gas bypass defrosting. A bypass line and its valve are added to the air conditioning system, connecting the compressor outlet and evaporator inlet. When defrosting conditions are met, the bypass valve opens, utilizing the heat generated by the compressor's operation for defrosting. However, this method involves a smaller flow rate in the bypass line, less defrosting heat, and a longer defrosting time. Furthermore, the compressor operates at high load during defrosting, and excessively high frequencies may lead to excessive noise during defrosting.

[0005] In view of the shortcomings of existing technologies, it is necessary to develop a defrosting method that does not affect the normal operation of the compressor and has high defrosting efficiency. Summary of the Invention

[0006] Therefore, this application provides a defrosting component and an air conditioning system that can solve the problem of low defrosting efficiency due to high compressor load operation in the prior art.

[0007] To address the aforementioned problems, this application provides a defrosting component, comprising:

[0008] The first connecting pipe has its inlet end connected to the outlet of the compressor;

[0009] The second connecting pipe is connected to the condenser outlet at its inlet end;

[0010] The outlet end of the first connecting pipe is connected to the outlet end of the second connecting pipe, and is also connected to the evaporator inlet.

[0011] Optionally, the defrosting assembly further includes a mixing chamber, wherein the outlet end of the first connecting pipe and the outlet end of the second connecting pipe are both connected to the mixing chamber, and the mixing chamber is connected to the evaporator inlet.

[0012] Optionally, the mixing chamber is equipped with a sensor for detecting parameters of the fluid in the mixing chamber.

[0013] Optionally, the sensor includes a pressure sensor and a temperature sensor to detect the pressure and temperature in the mixing chamber, respectively.

[0014] Optionally, both the first connecting pipe and the second connecting pipe are equipped with regulating valves to control the flow rate of the first connecting pipe and the second connecting pipe.

[0015] Optionally, both the first connecting pipe and the second connecting pipe are equipped with check valves to prevent fluid from flowing from the outlet to the inlet in the first connecting pipe and the second connecting pipe.

[0016] According to another aspect of this application, an air conditioning system is provided, including the defrosting assembly as described above.

[0017] Optionally, the air conditioning system further includes a compressor, a condenser, and an evaporator connected in a refrigeration cycle loop. The inlet end of the first connecting pipe is connected to the outlet of the compressor, and the inlet end of the second connecting pipe is connected to the outlet of the condenser. The outlet ends of the first connecting pipe and the second connecting pipe converge and are connected to the inlet of the evaporator.

[0018] Optionally, the compressor includes an upper flange and a partition plate. The upper flange is provided with an exhaust port for the compression chamber, and the partition plate covers the exhaust port. The partition plate is provided with a first air hole and a second air hole. The first air hole is connected to the condenser, and the second air hole is connected to the inlet end of the first connecting pipe.

[0019] Optionally, the side of the upper flange away from the compression chamber is provided as a groove, and the partition is provided in the groove; the first air hole is provided on the side of the partition along the axial direction of the upper flange, and the second air hole is provided on the side of the partition along the radial direction of the upper flange; a third air hole is provided on the side wall of the groove corresponding to the second air hole.

[0020] This application provides a defrosting assembly, comprising: a first connecting pipe, the inlet end of which is connected to the outlet of a compressor; a second connecting pipe, the inlet end of which is connected to the outlet of a condenser; the outlet end of the first connecting pipe is connected to the outlet end of the second connecting pipe, and is also connected to the inlet of an evaporator.

[0021] This application uses two connecting pipelines to mix the high-temperature fluid discharged from the compressor and the fluid passing through the condenser, and then sends them to the evaporator to perform a defrosting operation on the evaporator. This ensures that the high-temperature gas discharged from the compressor can be used directly to achieve high-efficiency defrosting without stopping the compressor. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the air conditioning system according to an embodiment of this application;

[0023] Figure 2 This is a partial structural schematic diagram of the compressor according to an embodiment of this application.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Upper flange; 2. Partition plate; 3. First vent; 4. Second vent; 5. Third vent; 6. Compressor; 7. First check valve; 8. Solenoid valve; 9. Mixing chamber; 91. Temperature sensor; 92. Pressure sensor; 10. Condenser; 11. Flow regulating valve; 12. Second connecting pipe; 13. Throttling valve; 14. Second check valve; 15. Third connecting pipe; 16. Evaporator; 17. First connecting pipe. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] See also Figures 1 to 2 As shown, according to an embodiment of this application, a defrosting assembly includes:

[0029] The first connecting pipe 17 is connected to the outlet of the compressor 6 at its inlet end.

[0030] The second connecting pipe 12 is connected to the outlet of the condenser 10 at its inlet end;

[0031] The outlet end of the first connecting pipe 17 is connected to the outlet end of the second connecting pipe 12, and is also connected to the inlet of the evaporator 16.

[0032] This application uses two connecting pipes to mix the high-temperature fluid discharged from the compressor 6 and the fluid passing through the condenser 10, and then sends the mixture to the evaporator 16 through the third connecting pipe 15 to perform a defrosting operation on the evaporator 16. This ensures that the high-temperature gas discharged from the compressor 6 can be used directly without stopping the compressor 6 to achieve high-efficiency defrosting.

[0033] In a conventional air conditioning system refrigerant circulation structure, the compressor 6, condenser 10, and evaporator 16 form a loop. This application adds a first connecting pipe 17 at the compressor 6 outlet as a bypass, outputting a portion of high-temperature refrigerant. Meanwhile, the refrigerant in the circulation loop, after being cooled by the condenser 10, is also cooled and mixed with the high-temperature refrigerant in the first connecting pipe 17 via the bypass structure of the second connecting pipe 12, reaching a suitable temperature before being delivered to the evaporator 16. This allows for defrosting when frost has formed on the external surface. During this time, the compressor 6 operates normally without stopping, and the indoor and outdoor fans operate normally, maintaining the system in heating mode. Indoor temperature fluctuations are minimal, not affecting user comfort, and the problem of starting the compressor 6 with liquid remaining after defrosting is avoided. Defrosting is accomplished using the heat from the mixture of the high-temperature, high-pressure refrigerant discharged from the compressor 6 cylinder and the refrigerant discharged from the indoor heat exchanger, resulting in high heat output and high defrosting efficiency. The flow rate of the defrosting refrigerant can be adjusted for different defrosting conditions, achieving energy savings and optimal defrosting performance.

[0034] In some embodiments, the defrosting assembly further includes a mixing chamber 9, wherein the outlet end of the first connecting pipe 17 and the outlet end of the second connecting pipe 12 are both connected to the mixing chamber 9, and the mixing chamber 9 is connected to the inlet of the evaporator 16.

[0035] The fluids output from the first connecting pipe 17 and the second connecting pipe 12 are mixed in the mixing chamber 9, making the temperature of the entire fluid more uniform and controllable. This facilitates the selective output to the evaporator 16 for defrosting, thereby improving defrosting efficiency and energy saving.

[0036] In some embodiments, the mixing chamber 9 is equipped with sensors for detecting parameters of the fluid in the mixing chamber 9. Preferably, the sensors include a pressure sensor 92 and a temperature sensor 91, which detect the pressure and temperature in the mixing chamber 9, respectively.

[0037] Sensors, including a pressure sensor 92 and a temperature sensor 91, are installed in the mixing chamber 9 to monitor the fluid in the mixing chamber 9 in a timely manner. Based on different defrosting conditions, the state and flow rate of the defrosting refrigerant required by the evaporator 16 are adjusted. The mixing chamber 9 can automatically adjust the state and flow rate of the defrosting refrigerant to achieve energy-saving effects and optimal defrosting performance.

[0038] In some embodiments, both the first connecting pipe 17 and the second connecting pipe 12 are provided with regulating valves to regulate the flow rate of the first connecting pipe 17 and the second connecting pipe 12.

[0039] The fluid flow rate of the first connecting pipe 17 and the second connecting pipe 12 can be adjusted by setting the inner diameter of the pipe itself, or by installing a regulating valve on the pipe for automated control.

[0040] A flow regulating valve 11 is designed on the second connecting pipe 12. When the system is defrosting, the flow regulating valve 11 can control the refrigerant flow of the connecting pipe, thereby controlling the defrosting refrigerant flow and achieving energy saving and optimal defrosting effect.

[0041] In some embodiments, both the first connecting pipe 17 and the second connecting pipe 12 are provided with check valves to prevent fluid from flowing from the outlet to the inlet in the first connecting pipe 17 and the second connecting pipe 12.

[0042] The first connecting pipe 17 is equipped with a first check valve 7, and the second connecting pipe 12 is equipped with a second check valve 14, which serves to prevent fluid backflow and affect the normal heating process of the air conditioning system.

[0043] According to another aspect of this application, an air conditioning system is provided, including the defrosting assembly as described above.

[0044] In some embodiments, the air conditioning system further includes a compressor 6, a condenser 10, and an evaporator 16 connected in a refrigeration cycle loop. The inlet end of the first connecting pipe 17 is connected to the outlet of the compressor 6, and the inlet end of the second connecting pipe 12 is connected to the outlet of the condenser 10. The outlet ends of the first connecting pipe 17 and the second connecting pipe 12 converge and are connected to the inlet of the evaporator 16.

[0045] In the traditional refrigerant circuit structure of an air conditioning system, the addition of the aforementioned defrosting component ensures that the air conditioning system can perform defrosting on the outdoor evaporator 16 without stopping the compressor 6 while in heating mode, with high efficiency. 90% of the high-temperature, high-pressure gaseous refrigerant discharged from the compressor chamber of the compressor 6 is discharged to the condenser 10, while the remaining 10% flows into the mixing chamber 9 via the first connecting pipe 17. A portion of the gaseous refrigerant flowing out of the condenser 10 (the indoor heat exchanger) participates in the normal refrigerant circulation, flowing to the expansion valve 13 and the evaporator 16, while the other portion flows into the mixing chamber 9 via the second connecting pipe 12. At this point, the refrigerant flow rate in the second connecting pipe 12 can be controlled, while simultaneously balancing the pressure in the mixing chamber 9. The mixed defrosting refrigerant is then delivered to the outdoor heat exchanger, where its heat is used for defrosting. After the system detects that defrosting is complete, the refrigerant flow through the first connecting pipe 17 and the second connecting pipe 12 can be stopped, and all the high-temperature, high-pressure gaseous refrigerant in the compressor 6 is discharged to the condenser 10, allowing the system to continue operating in heating mode.

[0046] In some embodiments, the compressor 6 includes an upper flange 1 and a partition 2. The upper flange 1 is provided with an exhaust port of the compression chamber, and the partition 2 covers the exhaust port. The partition 2 is provided with a first air hole 3 and a second air hole 4. The first air hole 3 is connected to the condenser 10, and the second air hole 4 is connected to the inlet end of the first connecting pipe 17.

[0047] The air outlet structure of the compressor 6 is configured such that a baffle 2 is installed over the exhaust port of the upper flange 1 of the compressor 6, and two air holes are provided on the baffle 2: a first air hole 3 and a second air hole 4. This facilitates the diversion of the discharged high-temperature and high-pressure gas in the gap between the baffle 2 and the upper flange 1, and the gas is delivered to different parts through the first air hole 3 and the second air hole 4 respectively.

[0048] In some embodiments, the side of the upper flange 1 away from the compression chamber is provided as a groove, and the partition 2 is provided in the groove; the first air hole 3 is provided on the side of the partition 2 along the axial direction of the upper flange 1, and the second air hole 4 is provided on the side of the partition 2 along the radial direction of the upper flange 1; a third air hole 5 is provided on the side wall of the groove corresponding to the second air hole 4.

[0049] Regarding the location of the two vents on the partition plate 2, the first vent 3, which is connected to the refrigerant circulation loop, is located on the side of the partition plate 2 along the axial direction of the upper flange 1, that is, opposite to the exhaust port. This ensures that most of the high-temperature and high-pressure gas is discharged through the first vent 3. The second vent 4 is set on the circumferential side wall of the partition plate 2, with a relatively small output. In order to facilitate the connection between the first connecting pipe 17 and the second vent 4, a third vent 5 is set on the side wall of the groove. The first connecting pipe 17 is directly inserted into the second vent 4 through the third vent 5 to avoid gas loss.

[0050] A baffle plate 2 is installed on the upper flange 1, forming two flow paths inside the baffle plate 2. The first flow path is for the high-temperature, high-pressure refrigerant discharged from the cylinder compression chamber through the valve plate of the upper flange 1. This refrigerant flows through the upper silencer's silencer chamber and finally exits the compressor 6 through the exhaust pipe at the top of the compressor 6. The second flow path is for the high-temperature, high-pressure refrigerant discharged from the cylinder compression chamber through the valve plate of the upper flange 1 during defrosting. This refrigerant is directly discharged from the compressor 6 through the second flow path, which does not affect the normal operation of the compressor 6 and provides heat for the defrosting process.

[0051] During the defrosting process, this application allows for adjustments to the refrigerant state and flow rate required by the outdoor heat exchanger (i.e., evaporator 16) based on different defrosting conditions. The mixing chamber 9 can automatically adjust the refrigerant state and flow rate to achieve energy savings and optimal defrosting performance.

[0052] 1. Mild defrosting condition: The first connecting pipe 17 is closed, and all the defrosting refrigerant in the mixing chamber 9 flows into the second connecting pipe 12 and continues to flow to the outdoor heat exchanger for defrosting. The flow regulating valve 11 in the mixing chamber 9 can be controlled by the pressure sensor 92 and the temperature sensor 91 to control the flow of defrosting refrigerant, thereby achieving energy saving.

[0053] 2. Severe defrosting conditions: The first connecting pipe 17 is opened and the second connecting pipe 12 is opened. The defrosting refrigerant in the mixing chamber 9 flows in simultaneously through the first and second connecting pipes 12, resulting in higher defrosting heat. The flow regulating valve 11 in the mixing chamber 9 can control the flow of the defrosting refrigerant through the pressure sensor 92 and the temperature sensor 91, thereby achieving the optimal defrosting effect.

[0054] In summary, the system defrosts simultaneously with the heating process, ensuring user comfort. The high exhaust temperature of the first connecting pipe 17 maximizes defrosting efficiency. The system has a simple structure; the flow regulating valve 11 controls the pressure and superheat of the mixing chamber 9. The refrigerant discharged into the compression chamber through the second connecting pipe 12 is dry gas, resulting in good defrosting performance and high stability. Different sources of defrosting refrigerant are used for different defrosting conditions, and the refrigerant flow rate can be adjusted to achieve energy savings and optimal defrosting performance. The refrigerant used for heating and defrosting operations is in the same state as the refrigerant after exiting the outdoor heat exchanger, directly entering the gas-liquid separator without affecting the reliability of the compressor 6.

[0055] The compressor 6 mentioned above can be a single-cylinder compressor or a twin-cylinder compressor.

[0056] It will be readily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

[0057] 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 assembly, characterized in that, include: The first connecting pipe (17) is connected to the outlet of the compressor (6) at its inlet end; The second connecting pipe (12) is connected to the outlet of the condenser (10) at its inlet end; The outlet end of the first connecting pipe (17) is connected to the outlet end of the second connecting pipe (12) and is connected to the inlet of the evaporator (16); Both the first connecting pipe (17) and the second connecting pipe (12) are equipped with regulating valves to regulate the flow rate of the first connecting pipe (17) and the second connecting pipe (12); The defrosting assembly also includes a mixing chamber (9), the outlet end of the first connecting pipe (17) and the outlet end of the second connecting pipe (12) are both connected to the mixing chamber (9), and the mixing chamber (9) is connected to the inlet of the evaporator (16).

2. The defrosting assembly according to claim 1, characterized in that, The mixing chamber (9) is equipped with a sensor for detecting the parameters of the fluid in the mixing chamber (9).

3. The defrosting assembly according to claim 2, characterized in that, The sensors include a pressure sensor (92) and a temperature sensor (91), which detect the pressure and temperature in the mixing chamber (9), respectively.

4. The defrosting assembly according to claim 1, characterized in that, Both the first connecting pipe (17) and the second connecting pipe (12) are equipped with check valves to prevent fluid from flowing from the outlet to the inlet in the first connecting pipe (17) and the second connecting pipe (12).

5. An air conditioning system, characterized in that, Includes the defrosting assembly as described in any one of claims 1-4.

6. The air conditioning system according to claim 5, characterized in that, The air conditioning system also includes a compressor (6), a condenser (10) and an evaporator (16) connected by a refrigeration cycle loop. The inlet end of the first connecting pipe (17) is connected to the outlet of the compressor (6), and the inlet end of the second connecting pipe (12) is connected to the outlet of the condenser (10). The outlet ends of the first connecting pipe (17) and the second connecting pipe (12) converge and are connected to the inlet of the evaporator (16).

7. The air conditioning system according to claim 6, characterized in that, The compressor (6) includes an upper flange (1) and a partition (2). The upper flange (1) is provided with an exhaust port for the compression chamber, and the partition (2) covers the exhaust port. The partition (2) is provided with a first air hole (3) and a second air hole (4). The first air hole (3) is connected to the condenser (10), and the second air hole (4) is connected to the inlet end of the first connecting pipe (17).

8. The air conditioning system according to claim 7, characterized in that, The upper flange (1) is provided with a groove on the side away from the compression chamber, and the partition plate (2) is provided in the groove; the first air hole (3) is provided on the side of the partition plate (2) along the axial direction of the upper flange (1), and the second air hole (4) is provided on the side of the partition plate (2) along the radial direction of the upper flange (1); the groove is provided with a third air hole (5) on the side wall corresponding to the second air hole (4).

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