Air conditioning system

Abstract

An air conditioning system comprises a four-way valve, a hot gas bypass branch and an evaporator pipe. After a refrigerant output by the compressor passes through the oil separator, one path of the refrigerant sequentially passes through the four-way valve, the condenser on the indoor side, the throttling element, the radiator of the IPM module and the evaporator on the outdoor side, and then enters the vapor-liquid separator through the four-way valve again; the other path enters the input end of a hot gas bypass branch, and then flows into a pipeline between the throttling element and a radiator of the IPM through an evaporator pipe at the lower part in the evaporator and the output end of the hot gas bypass branch; the liquid storage caused by the fact that the liquid refrigerant is directly introduced into the vapor-liquid separator can be effectively reduced, and the risk that the IPM module is condensed and the bottom of the evaporator is frozen can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning equipment technology, and in particular to an air conditioning system. Background Technology

[0002] Currently, in heating mode, to alleviate the problem of frost and ice buildup at the bottom of the evaporator, air conditioning systems have a branch line from the high-pressure side that connects to the pre-installed evaporator tube at the bottom of the evaporator. Figure 1 and Figure 2 As shown, a hot gas bypass valve is provided. High-temperature and high-pressure gas condenses into medium-temperature and medium-pressure refrigerant at the bottom of the evaporator and enters the vapor-liquid separator through the hot gas bypass branch. At this time, liquid refrigerant is easily stored in the vapor-liquid separator, causing refrigerant to accumulate in the vapor-liquid separator, which leads to a reduction in the amount of refrigerant circulating in the system and affects the heating effect of the air conditioning system.

[0003] Currently, IPM module cooling mainly relies on refrigerant flowing from the indoor unit through a throttling element into the IPM heat dissipation module. If due to system reasons, such as refrigerant shortage, the temperature of the refrigerant passing through the throttling element is easily lower than the dew point temperature, causing condensation to form on the module after it is introduced into the IPM heat dissipation module. If the dew drops onto the motherboard, it can easily cause serious consequences such as motherboard corrosion and damage. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an air conditioning system, a control method, a control device, and a storage medium.

[0005] The present invention adopts the following technical solution:

[0006] This application provides an air conditioning system, including: a four-way valve, a hot gas bypass branch, and an evaporator tube; the refrigerant output from the compressor passes through an oil separator and then sequentially through the four-way valve, the indoor condenser, a throttling element, the radiator of the IPM module, and the outdoor evaporator, before entering the vapor-liquid separator again through the four-way valve; the other path enters the input end of the hot gas bypass branch, and then flows through the evaporator tube below the evaporator and the output end of the hot gas bypass branch into the pipeline between the throttling element and the radiator of the IPM module.

[0007] According to the aforementioned air conditioning system, the air conditioning system further includes a hot gas bypass valve, which is located on one side of the input end of the hot gas bypass branch and is used to control the on / off state of the hot gas bypass branch.

[0008] According to the aforementioned air conditioning system, a throttling element temperature sensor is also provided on the output side of the throttling element to obtain the throttling element temperature; a defrost temperature sensor is provided on the bottom side inside the evaporator to obtain the defrost temperature; an IPM temperature sensor is provided on the IPM module to obtain the IPM temperature; and the opening and closing of the hot gas bypass valve is controlled based on the comparison between the throttling element temperature, the defrost temperature, the IPM module temperature and their respective preset temperatures.

[0009] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0010] This application designs an air conditioning system in which, without increasing costs, high-temperature and high-pressure refrigerant flows through the evaporator tube from the input end of the hot gas bypass branch, and then flows into the pipeline between the throttling element and the radiator of the IPM module from the output end of the hot gas bypass branch. This can effectively reduce the liquid storage caused by the direct introduction of liquid refrigerant into the vapor-liquid separator, and also avoid the risks of condensation in the IPM module and ice formation at the bottom of the evaporator. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of an evaporator in the prior art;

[0013] Figure 2 Diagram of an existing air conditioning system;

[0014] Figure 3 This is a diagram of the air conditioning system in this application;

[0015] Figure 4 This is a flowchart of an air conditioning system control method according to this application;

[0016] Figure 5 This is a flowchart showing the opening and closing of the hot gas bypass valve when the system of this application is in a high-load heating state.

[0017] Figure 6 This is a flowchart showing the opening and closing of the hot gas bypass valve when the system of this application is in normal load heating state.

[0018] Figure 7 This is a flowchart showing the opening and closing of the hot gas bypass valve when the system of this application is in a low-load heating state.

[0019] Figure 8 This is a block diagram of a control device according to this application;

[0020] Figure 9 This is a schematic diagram illustrating the working principle of a preferred embodiment of this application.

[0021] Reference numerals in the attached diagram: 1. Compressor; 2. Defrosting temperature sensor; 3. Hot gas bypass valve; 4. Hot gas bypass branch; 5. Throttling element temperature sensor; 6. IPM module; 7. Throttling element; 8. Evaporator; 9. Evaporator tube; 10. Oil separator; 11. Oil return valve; 12. Vapor-liquid separator; 13. Condenser; 14. Four-way valve. Detailed Implementation

[0022] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, 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 disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0024] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0025] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0026] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0028] This application solves the liquid retention problem caused by directly introducing liquid refrigerant into the vapor-liquid separator by changing the location of the hot gas bypass branch and providing a control method, thereby avoiding the condensation problem of the IPM module by introducing medium-temperature and medium-pressure refrigerant into the heat sink of the IPM module.

[0029] The compressor compresses the low-temperature, low-pressure vaporized refrigerant to form a high-temperature, high-pressure vaporized refrigerant. This vaporized refrigerant is then separated from the lubricating oil carried by the compressor by an oil separator. The lubricating oil returns to the compressor via an oil return valve, while the high-temperature, high-pressure vaporized refrigerant enters the condenser through a four-way valve. The condenser condenses the high-pressure vaporized refrigerant to form a low-temperature, high-pressure liquid refrigerant. This high-pressure liquid refrigerant passes through a throttling element and becomes a low-temperature, low-pressure two-phase refrigerant. The two-phase refrigerant passes through an IPM heat dissipation module and enters the evaporator for heat absorption and evaporation, becoming a low-temperature, low-pressure vaporized refrigerant. This vaporized refrigerant then passes through a four-way valve into a vapor-liquid separator, and the separated vaporized refrigerant is fed back into the compressor, repeating the above cycle.

[0030] First embodiment:

[0031] This application addresses the liquid retention problem caused by directly introducing liquid refrigerant into the vapor-liquid separator, and the technical issue of condensation on the IPM module when the temperature of the refrigerant flowing out of the throttling element is lower than the dew point temperature, leading to condensation on the IPM heat dissipation module. Please refer to [link to relevant documentation]. Figure 1 and Figure 3 One embodiment of this application provides an air conditioning system.

[0032] The air conditioning system includes: a four-way valve 14, a hot gas bypass branch 4, and an evaporator tube 9;

[0033] The refrigerant output from compressor 1 passes through oil separator 10 and then sequentially through four-way valve 14, indoor condenser 13, throttling element 7, radiator of IPM module 6, and outdoor evaporator 8. It then enters vapor-liquid separator 12 through four-way valve 14 again. Another path enters the input end of hot gas bypass branch 4, and then flows through evaporator pipe 9 below evaporator 8 and the output end of hot gas bypass branch 4 into the pipeline between throttling element 7 and radiator of IPM module 6.

[0034] The air conditioning system also includes a hot gas bypass valve 3, which is located on one side of the input end of the hot gas bypass branch 4 and is used to control the opening and closing of the hot gas bypass branch.

[0035] A throttling element temperature sensor 5 is also provided on the output side of the throttling element 7 to obtain the temperature of the throttling element.

[0036] A defrosting temperature sensor 2 is installed on the bottom side inside the evaporator 8 to obtain the defrosting temperature.

[0037] An IPM temperature sensor is provided on IPM module 6 to obtain the IPM temperature;

[0038] The opening and closing of the hot gas bypass valve 3 is controlled by comparing the temperature sensed by the throttling element, the defrosting temperature sensed by the defrosting element, the temperature of the IPM module, and their respective preset temperatures, as well as the combination of the comparisons.

[0039] An oil return valve 11 is provided between the oil separator 10 and the compressor 1 to guide the lubricating oil back to the compressor 1 and prevent refrigerant backflow.

[0040] When it is necessary to prevent condensation on the IPM module 6 and icing on the evaporator 8, the branch is opened through the hot gas bypass valve 3, and the high-temperature and high-pressure refrigerant enters the evaporator tube 9 to prevent the evaporator 8 from icing and to neutralize the temperature of the refrigerant flowing out of the throttling element 7, thereby avoiding the risk of condensation on the IPM module 6.

[0041] Hot gas bypass branch 4 is introduced into the heat sink of IPM module 6, which can reduce the storage of liquid refrigerant in vapor-liquid separator 12 and allow medium-temperature and medium-pressure refrigerant to be introduced into the heat sink of IPM module 6, thereby increasing the refrigerant pressure and temperature in the heat sink and preventing condensation in IPM module.

[0042] Second embodiment:

[0043] One embodiment of this application discloses an air conditioning system control method, such as... Figure 4 As shown, optionally, the method steps of this embodiment can be executed by a control device.

[0044] The control method includes:

[0045] Step 401: When the air conditioning system is in heating mode, obtain the ambient temperature Te;

[0046] The ambient temperature is the outdoor temperature, which can be obtained by the ambient temperature sensor of the air conditioning system.

[0047] Step 402: Determine the current heating status of the air conditioning system load based on the ambient temperature Te and the preset temperature threshold.

[0048] Optionally, step 402 above can determine the current heating status of the air conditioning system load by comparing the first preset temperature threshold T1 and the second preset temperature threshold T2 with the ambient temperature Te.

[0049] For example, when the ambient temperature Te is greater than or equal to the first preset temperature threshold T1, the air conditioning system is in a high-load heating state;

[0050] When the ambient temperature Te is greater than the second preset temperature threshold T2 and the ambient temperature Te is less than the first preset temperature threshold T1, the air conditioning system is in normal load heating state.

[0051] When the ambient temperature Te is less than or equal to the second preset temperature threshold T2, the air conditioning system is in a low-load heating state.

[0052] It should be noted that the above method is merely an example and does not imply that this disclosure is limited thereto. Those skilled in the art can also use other feasible methods to determine the corresponding parameters.

[0053] Step 403: Based on the load heating status of the air conditioning system, the opening and closing of the hot gas bypass valve is controlled to prevent condensation in the IPM module and icing in the evaporator.

[0054] When the air conditioning system is in high-load heating mode, the opening and closing of the hot gas bypass valve is controlled to achieve the anti-condensation control of the IPM module.

[0055] When the air conditioning system is in normal load heating mode, the opening and closing of the hot gas bypass valve is controlled to realize the control of IPM module anti-condensation and evaporator anti-icing.

[0056] When the air conditioning system is in low-load heating mode, the opening and closing of the hot gas bypass valve is controlled to prevent the evaporator from freezing.

[0057] Optionally, the throttling element temperature Tj, the defrosting temperature Th, and the IPM module temperature Ti are obtained; at the same time, a third preset temperature threshold T3, a fourth preset temperature threshold T4, and a fifth preset temperature threshold T5 are set.

[0058] Based on the comparison between the throttling element temperature Tj and the third preset temperature threshold T3, the comparison between the defrosting temperature Th and the fourth preset temperature threshold T4, the comparison between the IPM module temperature Ti and the fifth preset temperature threshold T5, and the combination of the above comparison methods, it is determined whether the hot gas bypass valve needs to be opened or closed.

[0059] Optionally, the throttling element temperature Tj is obtained through the throttling element temperature sensor, and the defrosting temperature Th is obtained through the defrosting temperature sensor.

[0060] Please see Figure 5 When the air conditioning system is in a high-load heating state, the IPM module has a greater risk of condensation due to the high humidity of the air. The opening and closing of the hot gas bypass valve is controlled to prevent condensation in the IPM module.

[0061] Step 501: Determine whether the temperature Tj of the throttling element is less than the third preset temperature threshold T3, which is used to control the opening of the hot gas bypass valve.

[0062] When the temperature Tj of the throttling element is not less than the third preset temperature threshold T3, the system will continuously check whether the temperature Tj of the throttling element is less than the third preset temperature threshold T3.

[0063] When the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, the hot gas bypass valve is opened to supplement the medium-temperature and medium-pressure refrigerant into the heat sink of the IPM module, thus avoiding the risk of IPM condensation.

[0064] Step 502: After the hot gas bypass valve is opened, determine whether the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4, which is used to control the closing of the hot gas bypass valve.

[0065] When the IPM module temperature Ti is not greater than the fourth preset temperature threshold T4, the IPM module temperature Ti is repeatedly checked to see if it is greater than the fourth preset temperature threshold T4.

[0066] When the IPM module temperature Ti is greater than the fourth preset temperature threshold T4, the hot gas bypass valve is closed and the IPM anti-condensation control is exited.

[0067] Please see Figure 6 When the air conditioning system is in normal load heating state, there is a risk of condensation on the IPM module and the possibility of frost and ice formation on the evaporator. By controlling the opening and closing of the hot gas bypass valve, the IPM module anti-condensation control and the evaporator anti-icing control can be realized.

[0068] Step 601: Determine whether the temperature Tj of the throttling element is less than the third preset temperature threshold T3, or whether the temperature Th of the defrosting element is less than the fifth preset temperature threshold T5, in order to control the opening of the hot gas bypass valve.

[0069] When the throttling element temperature Tj is not less than the third preset temperature threshold T3 and the defrosting temperature Th is not less than the fifth preset temperature threshold T5, then iteratively judges whether the throttling element temperature Tj is less than the third preset temperature threshold T3 or whether the defrosting temperature Th is less than the fifth preset temperature threshold T5.

[0070] When the temperature Tj of the throttling element is less than the third preset temperature threshold T3, or the temperature Th of the defrosting element is less than the fifth preset temperature threshold T5, the hot gas bypass valve is opened to defrost the evaporator and to replenish the medium-temperature and medium-pressure refrigerant into the heat sink of the IPM module to avoid the risk of condensation in the IPM module.

[0071] Step 602: After the hot gas bypass valve is opened, determine whether the IPM module temperature Ti is greater than the fourth preset temperature threshold T4 and whether the defrosting sensing temperature Th is greater than the fifth preset temperature threshold T5, in order to control the hot gas bypass valve to close.

[0072] When the IPM module temperature Ti is not greater than the fourth preset temperature threshold T4, or the defrost sensing temperature Th is not greater than the fifth preset temperature threshold T5, then the IPM module temperature Ti is repeatedly checked to see if it is greater than the fourth preset temperature threshold T4 and the defrost sensing temperature Th is greater than the fifth preset temperature threshold T5.

[0073] When the IPM module temperature Ti is greater than the fourth preset temperature threshold T4 and the defrosting sensing temperature Th is greater than the fifth preset temperature threshold T5, the hot gas bypass valve is closed, and the IPM anti-condensation control and evaporator anti-icing control are deactivated.

[0074] Please see Figure 7 When the air conditioning system is in a low-load heating state, the IPM module has no risk of condensation. At this time, it only judges whether there is a possibility of evaporator frosting or icing. It controls the opening and closing of the hot gas bypass valve to achieve evaporator anti-icing control.

[0075] Step 701: Determine whether the defrosting temperature Th is less than the fifth preset temperature threshold T5, which is used to control the opening of the hot gas bypass valve.

[0076] When the defrosting temperature Th is not less than the fifth preset temperature threshold T5, the system will continuously check whether the defrosting temperature Th is less than the fifth preset temperature threshold T5.

[0077] When the defrosting temperature Th is less than the fifth preset temperature threshold T5, the hot gas bypass valve is opened to defrost the evaporator.

[0078] Step 702: After the hot gas bypass valve is opened, determine whether the defrosting temperature Th is greater than the fifth preset temperature threshold T5, which is used to control the closing of the hot gas bypass valve.

[0079] When the defrosting temperature Th is not greater than the fifth preset temperature threshold T5, the system will cycle through whether the defrosting temperature Th is greater than the fifth preset temperature threshold T5.

[0080] When the defrosting temperature Th is greater than the fifth preset temperature threshold T5, the hot gas bypass valve is closed and the evaporator anti-icing control is deactivated.

[0081] Please see Figure 9 , Figure 9 This is a schematic diagram illustrating the working principle of a preferred embodiment of this application.

[0082] The working principle is as follows:

[0083] When the air conditioning system is in heating mode, the ambient temperature Te is detected by the ambient temperature sensor of the air conditioning system. If Te ≥ T1, the air conditioning system is in a high-load heating state. If T2 < Te < T1, the air conditioning system is in a normal-load heating state. If Te ≤ T2, the air conditioning system is in a low-load heating state.

[0084] If the air conditioning system is in a high-load heating state, the IPM module has a greater risk of condensation due to the high humidity of the air. If the temperature Tj of the throttling element is detected to be lower than the third preset temperature threshold T3, the hot gas bypass valve is opened to supplement medium-temperature and medium-pressure refrigerant into the heat sink of the IPM module to avoid the risk of IPM condensation. After the hot gas bypass valve is opened, if the temperature Ti of the IPM module is higher than the fourth preset temperature threshold T4, the anti-condensation control is exited and the hot gas bypass valve is closed.

[0085] If the air conditioning system is in normal load heating mode, there is a risk of condensation on the IPM module and the possibility of frost or ice formation on the evaporator. If the temperature of the throttling element Tj is detected to be lower than the third preset temperature threshold T3 or the defrosting temperature Th is lower than the fifth preset temperature threshold T5, the hot gas bypass valve is opened to defrost the evaporator and replenish medium-temperature and medium-pressure refrigerant into the radiator of the IPM module to avoid the risk of condensation on the IPM. After the hot gas bypass valve is opened, if the defrosting temperature Th is higher than the fifth preset temperature threshold T5 and the IPM module temperature Ti is higher than the fourth preset temperature threshold T4, the anti-condensation control is exited and the hot gas bypass valve is closed.

[0086] If the air conditioning system is in a low-load heating state, the IPM module has no risk of condensation. At this time, it only judges whether there is a possibility of evaporator frosting or icing. If the defrosting temperature Th is lower than the fifth preset temperature threshold T5, the hot gas bypass valve is opened to defrost the evaporator. After the hot gas bypass valve is opened, if the defrosting temperature Th is higher than the fifth preset temperature threshold T5, the anti-icing control is exited and the hot gas bypass valve is closed.

[0087] Third embodiment:

[0088] Please see Figure 8 This application also provides a control device based on an air conditioning system control method, including: a signal acquisition module 801, a load heating state determination module 802, a hot gas bypass valve opening and closing judgment module 803, and a control module 804.

[0089] Signal acquisition module 801 is used to acquire ambient temperature Te, throttling element temperature Tj, defrosting temperature Th, and IPM module temperature Ti;

[0090] The load heating status determination module 802 is used to determine the current load heating status of the air conditioning system based on the ambient temperature Te and a preset temperature threshold.

[0091] The hot gas bypass valve opening / closing judgment module 803 is used to determine whether the hot gas bypass valve needs to be opened or closed based on the comparison between the throttling element temperature Tj and the third preset temperature threshold T3, the defrosting temperature Th and the fourth preset temperature threshold T4, the IPM module temperature Ti and the fifth preset temperature threshold T5, and the combination of the above comparison methods, and in combination with the current heating load of the air conditioning system.

[0092] Control module 804 is used to control the opening and closing of the hot gas bypass valve.

[0093] Fourth embodiment:

[0094] This utility model also provides a storage medium storing a computer program, which, when executed by a processor, implements an air conditioning system control method disclosed in this utility model.

[0095] Storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Storage media can be, for example, but not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples of storage media (a non-exhaustive list) include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. Storage media as used herein is not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0096] The computer-readable program instructions described herein can be downloaded from storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper cables, fiber optic cables, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to storage media within the respective computing / processing device.

[0097] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. An air conditioning system, characterized by, include: Four-way valve, hot gas bypass branch and evaporator tube; The refrigerant output from the compressor passes through the oil separator and then sequentially through the four-way valve, the indoor condenser, the throttling element, the radiator of the IPM module, and the outdoor evaporator before entering the vapor-liquid separator again through the four-way valve. Another path enters the input end of the hot gas bypass branch, and then flows through the evaporator tubes below the evaporator and the output end of the hot gas bypass branch into the pipe between the throttling element and the heat sink of the IPM module.

2. An air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a hot gas bypass valve, located on one side of the input end of the hot gas bypass branch, for controlling the opening and closing of the hot gas bypass branch.

3. An air conditioning system according to claim 2, characterized in that: A throttling element temperature sensor is also provided on the output side of the throttling element to obtain the temperature of the throttling element. A defrost temperature sensor is installed on the bottom side of the evaporator to obtain the defrost temperature. An IPM temperature sensor is installed on the IPM module to obtain the IPM temperature; The opening and closing of the hot gas bypass valve is controlled by comparing the temperature sensed by the throttling element, the defrosting element, the IPM module, and their respective preset temperatures.

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