Air conditioning equipment and heat pump systems

Abstract

This application relates to the field of air conditioning, and particularly to an air conditioning device and a heat pump system. The heat pump system includes a compressor, an indoor heat exchanger assembly, an outdoor heat exchanger assembly, a throttling assembly, a reversing valve assembly, and a flash evaporator. The indoor heat exchanger assembly includes a first indoor heat exchanger and a second indoor heat exchanger. The reversing valve assembly is used to switch the flow direction of refrigerant between the compressor, the indoor heat exchanger assembly, and the outdoor heat exchanger assembly. The first end of the first indoor heat exchanger is connected to the reversing valve assembly, and the first end of the second indoor heat exchanger is connected to a liquid refrigerant outlet. The second ends of both are connected to the first end of the outdoor heat exchanger assembly. A first evaporation branch is connected between the second end of the first indoor heat exchanger and the liquid refrigerant inlet, and the first evaporation branch is equipped with a first branch throttling valve. The above-mentioned heat pump system can switch the heat pump reheater between high-pressure condensation and medium-pressure condensation states according to temperature and humidity control requirements, avoiding refrigerant accumulation in the reheater.

Description

Technical Field

[0001] This application relates to the field of air conditioning, and more particularly to an air conditioning device and a heat pump system. Background Technology

[0002] In existing technologies, heat pump temperature and humidity control systems include a compressor, two sets of indoor heat exchangers, an outdoor heat exchanger, a throttling component, and a valve assembly. The valve assembly switches the operating states of the outdoor and indoor heat exchangers, allowing each heat exchanger to arbitrarily switch between evaporation and condensation states. When one set of indoor heat exchangers, such as the first indoor heat exchanger, is in the evaporation state, and the other set of indoor heat exchangers, such as the second indoor heat exchanger, is in the condensation state along with the outdoor heat exchanger, the system operates in a dehumidification and reheat state, controlling the indoor temperature and humidity through the two sets of indoor heat exchangers.

[0003] If the outdoor temperature is high while the indoor temperature and humidity need to be controlled are low (e.g., outdoor 45℃, indoor 20℃ / 50%), there will be a large heat and humidity load indoors, while the heat reheat is very small. In this case, the second indoor heat exchanger, which is in a condensed state, will experience the following operating conditions: Since the indoor temperature is much lower than the outdoor temperature, and the air entering the second indoor heat exchanger is cooled by the first indoor heat exchanger, the heat exchange effect of the second indoor heat exchanger and the outdoor heat exchanger, which are both in a condensed state, will be very different. The heat exchange effect of the second indoor heat exchanger will be much better than that of the outdoor heat exchanger. Furthermore, since the flow rate of the second indoor heat exchanger is very small, the high-temperature and high-pressure refrigerant will accumulate rapidly and in large quantities inside the second indoor heat exchanger.

[0004] A large accumulation of refrigerant in the second indoor heat exchanger can cause the system to exhibit a "refrigerant shortage" state. Especially under high outdoor temperatures, this can easily lead to an increase in the compressor's exhaust temperature, potentially triggering the compressor's high-temperature exhaust protection, limiting or even reducing the compressor's output, and ultimately resulting in an inability to meet indoor heat and humidity load requirements, causing temperature and humidity overshoot. Summary of the Invention

[0005] This application provides an air conditioning device and a heat pump system, which enables the second indoor heat exchanger, which acts as a reheater in the dehumidification and reheating state, to switch between high-pressure condensation and medium-pressure condensation states according to the temperature and humidity regulation requirements. It has a high reheat capacity regulation range, so as to solve the problem of refrigerant shortage caused by refrigerant accumulation in the reheater and improve the stability of system operation.

[0006] In a first aspect, this application provides a heat pump system, comprising:

[0007] The compressor is equipped with an air intake port, an air exhaust port, and a medium-pressure air extraction port;

[0008] The indoor heat exchanger assembly includes at least a first indoor heat exchanger and a second indoor heat exchanger, wherein the second indoor heat exchanger is located downstream of the air outlet direction of the first indoor heat exchanger.

[0009] Outdoor heat exchanger assembly;

[0010] Throttling components;

[0011] The reversing valve assembly is connected between the compressor, the indoor heat exchanger assembly, and the outdoor heat exchanger assembly. It is used to control the flow direction of refrigerant between the compressor, the indoor heat exchanger assembly, and the outdoor heat exchanger assembly to form a refrigerant circuit.

[0012] The flash evaporator is equipped with a liquid refrigerant inlet, a liquid refrigerant outlet, and a gaseous refrigerant outlet. The gaseous refrigerant outlet is connected to the medium-pressure exhaust port through a reversing valve group, and the liquid refrigerant inlet is connected to the first end of the second indoor heat exchanger.

[0013] The first end of the first indoor heat exchanger is connected to the reversing valve assembly. The second end of the first indoor heat exchanger and the second end of the second indoor heat exchanger are both connected to the first end of the outdoor heat exchanger assembly. The second end of the outdoor heat exchanger assembly is directly connected to or connected to the exhaust port of the compressor through the reversing valve assembly. The second end of the first indoor heat exchanger and the liquid refrigerant outlet are connected to the first evaporation branch. The throttling assembly includes a first branch throttling valve located in the first evaporation branch.

[0014] Based on the above technical means, the refrigerant flow direction is changed by the reversing valve assembly to meet the operating requirements of different modes of the heat pump system:

[0015] When the heat pump system has a relatively large reheat capacity, i.e., is in a high-pressure condensation state, the reversing valve group switches the refrigerant flow direction, making the first indoor heat exchanger act as an evaporator and the second indoor heat exchanger act as a condenser. In other words, the second indoor heat exchanger is a reheater at this time. The first branch throttling valve is closed, and the high-temperature and high-pressure exhaust gas flows through the reversing valve group, passes through the flash evaporator, and enters the second indoor heat exchanger for condensation and reheating. After being throttled by the throttling component at the second indoor heat exchanger, it flows to the throttling component at the first indoor heat exchanger for secondary throttling, and then flows to the first indoor heat exchanger for complete evaporation.

[0016] When the heat pump system has a relatively small reheat capacity, i.e., is in a medium-pressure condensing state, the reversing valve assembly switches the refrigerant flow direction, making the first indoor heat exchanger act as an evaporator, and the second indoor heat exchanger and outdoor heat exchanger assembly act as condensers; that is, the second indoor heat exchanger is now a reheater. The first branch throttling valve opens. The compressor exhaust passes through the reversing valve assembly into the outdoor heat exchanger assembly for condensation. The refrigerant after outdoor condensation splits into two paths: one path passes through the throttling assembly of the first indoor heat exchanger and enters the first indoor heat exchanger for evaporation, and since the second indoor heat exchanger is located downstream of the first indoor heat exchanger's air outlet direction, the other path is throttled to medium pressure by the throttling assembly of the second indoor heat exchanger and then condenses and is discharged to the flash evaporator. Then, the flash evaporator performs gas-liquid separation. The gaseous refrigerant exits the flash tank and enters the medium-pressure exhaust port through the reversing valve assembly, while the liquid refrigerant flows through the first throttling branch and is throttled by the first branch throttling valve before entering the first indoor heat exchanger for complete evaporation.

[0017] The presence of the flash evaporator ensures that the refrigerant entering the compressor's medium-pressure extraction port is always gaseous, guaranteeing reliable compressor operation. The first throttling branch and the first branch throttling valve effectively prevent liquid refrigerant from accumulating at the heat pump reheater, i.e., the second indoor heat exchanger, when the reheat load is large, thereby improving the system's reheat capacity adjustment range and thus enhancing the system's operational stability.

[0018] In some embodiments, the indoor heat exchanger assembly includes a third indoor heat exchanger, a second indoor heat exchanger is located downstream of the outlet air direction of the third indoor heat exchanger, a first end of the third indoor heat exchanger is connected to a reversing valve assembly, and a second end of the third indoor heat exchanger is connected to a first end of the outdoor heat exchanger assembly.

[0019] The second evaporation branch is connected between the second end of the third indoor heat exchanger and the liquid refrigerant outlet, and the throttling assembly includes a second branch throttling valve located in the second evaporation branch.

[0020] Based on the above technical means, by setting up the first and third indoor heat exchangers, and by using the first evaporation branch and the first branch throttling valve, the evaporation rate of the liquid refrigerant flowing from the flash evaporator to the first and third indoor heat exchangers is further increased, reducing the accumulation of liquid refrigerant. The first and third indoor heat exchangers are located upstream of the air supply direction of the second indoor heat exchanger, which reduces the temperature at the second indoor heat exchanger, increases the condensation reheat capacity and the system's reheat adjustment range, and thus improves the stability of system operation.

[0021] In some embodiments, the indoor heat exchanger assembly includes a third indoor heat exchanger located downstream of the air outlet direction of the first indoor heat exchanger. The heat pump system also includes a second flash evaporator, which has a liquid refrigerant second inlet, a liquid refrigerant second outlet, and a gaseous refrigerant second outlet. The gaseous refrigerant second outlet is connected to a reversing valve assembly, the liquid refrigerant second inlet is connected to a first end of the third indoor heat exchanger, and the second end of the third indoor heat exchanger is connected to a first end of the outdoor heat exchanger assembly.

[0022] A third evaporation branch is connected between the second end of the first indoor heat exchanger and the second outlet of the liquid refrigerant. The throttling assembly includes a third branch throttling valve located in the third evaporation branch.

[0023] Based on the above technical means, the installation of the third indoor heat exchanger shares the condensation reheat of the second indoor heat exchanger, thereby improving the reheat regulation range of the system; the installation of the second throttling branch and the second branch throttling valve, as well as the third throttling branch and the third branch throttling valve, effectively prevents the accumulation of liquid refrigerant in the second and third indoor heat exchangers, ensuring the stability of the circulating refrigerant volume and the stable operation of the system.

[0024] In some embodiments, the outdoor heat exchanger assembly includes a first outdoor heat exchanger and a second outdoor heat exchanger arranged in parallel, and a first end of the first outdoor heat exchanger, a first end of the second outdoor heat exchanger, and a second end of the indoor heat exchanger assembly are connected by a multi-way valve.

[0025] Based on the above technical means, the installation of the first outdoor heat exchanger and the second outdoor heat exchanger improves the heat exchange capacity of the outdoor heat exchanger, which helps to enhance the cooling / heating capacity of the system.

[0026] In some embodiments, the reversing valve assembly includes a first four-way valve, a second four-way valve, a fourth four-way valve, and a fifth four-way valve. Each four-way valve includes a C port, a D port, an E port, and an S port. Each four-way valve is connected to the compressor's suction port through the D port.

[0027] The first capillary tube is connected between the C port and the S port of the first four-way valve, and the E port of the first four-way valve is connected to the first end of the first indoor heat exchanger.

[0028] The second capillary tube is connected between the C port and the S port of the second four-way valve. The S port of the second four-way valve is connected to the medium-pressure suction port, and the E port is connected to the gaseous refrigerant outlet.

[0029] The fourth capillary tube is connected between the E port and the S port of the fourth four-way valve, and the C port of the fourth four-way valve is connected to the second end of the first outdoor heat exchanger.

[0030] The fifth capillary tube is connected between the E port and the S port of the fifth four-way valve, and the C port of the fifth four-way valve is connected to the second end of the second outdoor heat exchanger.

[0031] Furthermore, when a third indoor heat exchanger is also present, the reversing valve group also includes a third four-way valve. The C port and S port of the third four-way valve are connected to a third capillary tube, and the E port of the third four-way valve is connected to the first end of the third indoor heat exchanger.

[0032] Furthermore, when a third indoor heat exchanger and a second flash evaporator are present simultaneously, the reversing valve group also includes a third four-way valve. The C port and S port of the third four-way valve are connected to a third capillary tube. The S port of the third four-way valve is connected to a medium-pressure exhaust port, and the E port is connected to the second outlet of the gaseous refrigerant.

[0033] Based on the above technical means, the setting of the above reversing valve group ensures the switching of the refrigerant flow path in various working modes, and the setting of the second capillary tube effectively prevents the compressor exhaust from directly entering the medium-pressure suction port in the medium-pressure reheat mode; the setting of the third capillary tube and the second flash evaporation device also prevents the compressor exhaust from directly entering the medium-pressure suction port.

[0034] In some embodiments, a gas-liquid separator is also included, the outlet of which is connected to the suction port of the compressor, and the inlet of which is connected to the S port of the first four-way valve.

[0035] Based on the above technical means, the gas-liquid separator can effectively prevent liquid slugging in the compressor.

[0036] In some embodiments, a low-pressure sensor is provided before the inlet of the gas-liquid separator, and a high-pressure sensor and a high-pressure protection switch are provided at the exhaust port of the compressor.

[0037] The above-mentioned technical means facilitate the detection of the compressor's suction pressure and discharge pressure, and control the compressor's stable operation.

[0038] In some embodiments, the heat pump system satisfies at least one of the following:

[0039] The compressor's exhaust port is equipped with a first temperature sensor;

[0040] The first end of the first indoor heat exchanger is provided with a second temperature sensor, and the second end of the first indoor heat exchanger is provided with a third temperature sensor.

[0041] A fourth temperature sensor is provided at the second end of the second indoor heat exchanger;

[0042] Temperature sensing element at both ends of the outdoor heat exchanger assembly;

[0043] An oil separator is provided between the compressor's discharge port and the reversing valve assembly. A first filter and an oil return capillary are provided between the oil separator's return oil pipe and the compressor's suction port.

[0044] A filter assembly is provided at the second end of the indoor heat exchanger assembly and at least one end of the outdoor heat exchanger assembly.

[0045] Based on the above technical means, the setting of temperature sensors and temperature detection elements at different heat exchangers facilitates temperature detection to control and adjust the operating mode of the heat pump system; the setting of oil separator, oil return capillary tube, first filter and filter assembly can reduce impurities in the refrigerant circulation process and improve system life; and the setting of oil separator and oil return capillary tube can prevent the gaseous refrigerant returning to the compressor from carrying too many liquid droplets, prevent compressor liquid slugging, and at the same time have functions such as filtration, oil return, and liquid storage. Oil return can ensure sufficient lubrication of compressor oil.

[0046] In some embodiments, the throttling assembly includes a first throttling valve disposed at the second end of the first indoor heat exchanger, a second throttling valve disposed at the second end of the second indoor heat exchanger, and a throttling valve group disposed at the first end of the outdoor heat exchanger assembly, wherein one end of the first evaporation branch is connected between the second end of the first indoor heat exchanger and the first throttling valve.

[0047] Based on the above technical means, the setting of the throttling component ensures that the system can switch smoothly in various working modes and ensures the stable operation of various working modes.

[0048] In some embodiments, the indoor heat exchanger assembly further includes an indoor fan, and the first indoor heat exchanger, the second indoor heat exchanger, and the indoor fan are arranged sequentially to form an indoor air duct, with a fifth temperature sensor provided between the second indoor heat exchanger and the indoor fan.

[0049] Based on the above technical means, the indoor fan enhances the heat exchange of the indoor heat exchanger components. The sequential arrangement of the three components allows the second indoor heat exchanger to act as a dehumidification reheater in the reheat state. The setting of the fifth temperature sensor facilitates the adjustment of the system's reheat capacity according to the reheat temperature.

[0050] In some embodiments, the outdoor heat exchanger assembly further includes a first outdoor fan and a second outdoor fan, wherein the first outdoor fan, together with the first outdoor heat exchanger, forms a first outdoor air duct, and the second outdoor fan, together with the second outdoor heat exchanger, forms a second outdoor air duct.

[0051] Based on the aforementioned technical means, the installation of the first outdoor fan and the second outdoor fan enhances the heat exchange capacity of the outdoor heat exchanger components and improves the cooling / heating capacity of the system.

[0052] Secondly, this application provides an air conditioning device, including a control module and a heat pump system as described above, wherein the control module is electrically connected to a compressor, a reversing valve assembly, and a throttling component.

[0053] Compared with the prior art, the technical solution provided in this application has the following advantages: By changing the refrigerant flow direction through the reversing valve group, it meets the operational requirements of different modes of the heat pump system; by utilizing the compressor's medium-pressure extraction port, flash evaporator, first evaporation branch, and first branch throttling valve, it allows the system to operate in medium-pressure reheat mode, improving the system's reheat capacity adjustment range, reducing or even eliminating refrigerant accumulation at the dehumidification reheater, ensuring the amount of refrigerant circulating within the system, and improving the stability of system operation. The specific dehumidification reheat mode operation process is as follows:

[0054] When the heat pump system has a relatively large reheat capacity, i.e., is in a high-pressure condensation state, the reversing valve group switches the refrigerant flow direction, making the first indoor heat exchanger act as an evaporator and the second indoor heat exchanger act as a condenser. In other words, the second indoor heat exchanger is a reheater at this time. The first branch throttling valve is closed, and the high-temperature and high-pressure exhaust gas flows through the reversing valve group, passes through the flash evaporator, and enters the second indoor heat exchanger for condensation and reheating. After being throttled by the throttling component at the second indoor heat exchanger, it flows to the throttling component at the first indoor heat exchanger for secondary throttling, and then flows to the first indoor heat exchanger for complete evaporation.

[0055] When the heat pump system has a relatively small reheat capacity, i.e., is in a medium-pressure condensing state, the reversing valve assembly switches the refrigerant flow direction, making the first indoor heat exchanger act as an evaporator, and the second indoor heat exchanger and outdoor heat exchanger assembly act as condensers; that is, the second indoor heat exchanger is now a reheater. The first branch throttling valve opens. The compressor exhaust passes through the reversing valve assembly into the outdoor heat exchanger assembly for condensation. The refrigerant after outdoor condensation splits into two paths: one path passes through the throttling assembly of the first indoor heat exchanger and enters the first indoor heat exchanger for evaporation, and since the second indoor heat exchanger is located downstream of the first indoor heat exchanger's air outlet direction, the other path is throttled to medium pressure by the throttling assembly of the second indoor heat exchanger and then condenses and is discharged to the flash evaporator. Then, the flash evaporator performs gas-liquid separation. The gaseous refrigerant exits the flash tank and enters the medium-pressure exhaust port through the reversing valve assembly, while the liquid refrigerant flows through the first throttling branch and is throttled by the first branch throttling valve before entering the first indoor heat exchanger for complete evaporation. Attached Figure Description

[0056] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0057] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0059] Figure 1 A system diagram of a heat pump system provided in one embodiment of this application;

[0060] Figure 2 for Figure 1 A schematic diagram of the reheater of a medium-pressure heat pump system operating in a high-pressure condensation state;

[0061] Figure 3 for Figure 1 A schematic diagram of the reheater of a medium-pressure heat pump system operating in a medium-pressure condensing state;

[0062] Figure 4 A schematic diagram of an outdoor heat exchanger assembly of a heat pump system provided in another embodiment of this application;

[0063] Figure 5 A system diagram of a heat pump system provided in another embodiment of this application;

[0064] Figure 6 A system diagram of a heat pump system provided for another embodiment of this application.

[0065] Explanation of reference numerals in the attached figures:

[0066] 01-Compressor; 011-Exhaust port; 012-Intake port; 013-Medium-pressure suction port;

[0067] 02-Gas-Liquid Separator; 03-Oil Separator; 04-First Four-Way Valve; 05-Second Four-Way Valve; 06-Third Four-Way Valve; 07-Fourth Four-Way Valve; 08-Fifth Four-Way Valve; 09-First Indoor Heat Exchanger; 10-Second Indoor Heat Exchanger; 11-Third Indoor Heat Exchanger; 12-Indoor Fan; 13-First Throttling Valve; 14-Second Throttling Valve; 15-Third Throttling Valve; 16-High Pressure Sensor; 17-First Temperature Sensor; 18-High Pressure Protection Switch; 19-Low Pressure Sensor; 20-Second Temperature Sensor; 21-Third Temperature Sensor; 22-Fourth Temperature Sensor; 23-Fifth Temperature Sensor; 24-Temperature Detection Element; 25-First Capillary Tube; 26-Second Capillary Tube ; 27-Third capillary tube; 28-Fourth capillary tube; 29-Fifth capillary tube; 30-Oil return capillary tube; 31-Flash evaporator; 311-Gaseous refrigerant outlet; 312-Liquid refrigerant outlet; 313-Liquid refrigerant inlet; 32-Second flash evaporator; 321-Second gaseous refrigerant outlet; 322-Second liquid refrigerant outlet; 323-Second liquid refrigerant inlet; 33-Multi-port valve; 34-Stop valve; 35-Throttle valve assembly; 36-First outdoor heat exchanger; 37-Second outdoor heat exchanger; 38-First outdoor fan; 39-Second outdoor fan; 40-Filter assembly; 41-First throttling branch; 42-First branch throttling valve; 43-Second throttling branch; 44-Second branch throttling valve. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0070] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0071] To address the technical problems in existing heat pump systems where refrigerant accumulates at the dehumidification reheater in dehumidification reheat mode, resulting in insufficient refrigerant circulation and unstable system operation, this application provides an air conditioning device and heat pump system. This system improves the reheating capacity adjustment range, allowing the second indoor heat exchanger 10, which acts as the reheater, to operate under high-pressure and medium-pressure condensation conditions according to adjustment requirements. This effectively prevents liquid refrigerant accumulation at the reheater, ensures sufficient refrigerant circulation within the system, and improves system stability. In the embodiments of this application, the "first end" of each heat exchanger refers to the left end of the heat exchanger in the accompanying drawings, and the "second end" refers to the right end of the heat exchanger in the accompanying drawings.

[0072] See Figure 1 The heat pump system provided in this embodiment includes a compressor 01, an indoor heat exchanger assembly, an outdoor heat exchanger assembly, a throttling assembly, a reversing valve group, and a flash evaporator 31. The compressor 01 is a compressor 01 with a suction enthalpy-increasing function, and it has a suction port 012, a discharge port 011, and a medium-pressure suction port 013. The indoor heat exchanger assembly includes a first indoor heat exchanger 09 and a second indoor heat exchanger 10, which are connected in parallel between the compressor 01 and the outdoor heat exchanger assembly. The first indoor heat exchanger 09 and the second indoor heat exchanger 10 are arranged sequentially along the indoor air supply direction, with the second indoor heat exchanger 10 located downstream of the first indoor heat exchanger 09 in the air outlet direction. The throttling assembly is located at both the indoor heat exchanger assembly and the outdoor heat exchanger assembly. The reversing valve group connects the compressor 01, the indoor heat exchanger assembly, and the outdoor heat exchanger assembly, and is used to switch the flow direction of the refrigerant among the three, thereby forming a refrigerant circuit and realizing different operating modes.

[0073] The flash evaporator 31 is provided with a liquid refrigerant inlet 313, a liquid refrigerant outlet 312, and a gaseous refrigerant outlet 311. The gaseous refrigerant outlet 311 is connected to the medium-pressure suction port 013 of the compressor 01 via a reversing valve assembly. The liquid refrigerant inlet 313 is connected to the first end of the second indoor heat exchanger 10. The first end of the first indoor heat exchanger 09 is connected to the reversing valve assembly, and the second end of the first indoor heat exchanger 09 is connected to the first end of the outdoor heat exchanger assembly. The second end of the second indoor heat exchanger 10 is connected to the first end of the outdoor heat exchanger assembly. The second end of the outdoor heat exchanger assembly can be directly connected to the suction port 012 of the compressor 01 or connected to the suction port 012 of the compressor 01 via the reversing valve assembly. The second end of the first indoor heat exchanger 09 and the liquid refrigerant outlet 312 of the flash evaporator 31 are connected to a first evaporation branch. The throttling assembly also includes a first branch throttling valve 42 connected in series in the first evaporation branch.

[0074] The heat pump system provided in this application embodiment changes the refrigerant flow direction by means of a reversing valve assembly to meet the operational requirements of different heat pump system modes. The configuration of the medium-pressure extraction port 013 of compressor 01, flash evaporator 31, first evaporation branch, and first branch throttling valve 42 allows the system to operate in medium-pressure reheat mode, improving the system's reheat capacity adjustment range, reducing or even eliminating refrigerant accumulation at the dehumidification reheater, ensuring the amount of refrigerant circulating within the system, and improving the stability of system operation. The specific dehumidification reheat mode operation process is as follows:

[0075] See Figure 2 When the heat pump system has a relatively large reheat capacity, i.e., is in a high-pressure condensation state, the reversing valve group switches the refrigerant flow direction, so that the first indoor heat exchanger 09 acts as an evaporator and the second indoor heat exchanger 10 acts as a condenser. At this time, the second indoor heat exchanger 10 is a reheater. The first branch throttling valve 42 is closed, and the high-temperature and high-pressure exhaust gas of the compressor 01 flows through the reversing valve group, passes through the flash evaporator 31, and enters the second indoor heat exchanger 10 for condensation and reheating. After being throttled by the throttling component at the second indoor heat exchanger 10, it flows to the throttling component at the first indoor heat exchanger 09 for secondary throttling, and then flows to the first indoor heat exchanger 09 for complete evaporation.

[0076] See Figure 3When the heat pump system has a relatively small reheat capacity, i.e., is in a medium-pressure condensing state, the reversing valve group switches the refrigerant flow direction, so that the first indoor heat exchanger 09 acts as an evaporator, and the second indoor heat exchanger 10 and the outdoor heat exchanger assembly act as condensers. At this time, the second indoor heat exchanger 10 is a reheater; the first branch throttling valve 42 is opened. The compressor 01 exhaust enters the outdoor heat exchanger assembly for condensation through the reversing valve group. The refrigerant after outdoor condensation is divided into two paths. One path enters the first indoor heat exchanger 09 for evaporation after passing through the throttling assembly of the first indoor heat exchanger 09. Since the second indoor heat exchanger 10 is located downstream of the air outlet direction of the first indoor heat exchanger 09, the other path is throttled to medium pressure by the throttling assembly of the second indoor heat exchanger 10 and then condensed at the second indoor heat exchanger 10 before being discharged to the flash evaporator 31. Then, the flash evaporator 31 performs gas-liquid separation. After the gaseous refrigerant is discharged from the flash tank, it enters the medium-pressure exhaust port 013 through the reversing valve group. The liquid refrigerant flows through the first throttling branch 41 and is throttled by the first branch throttling valve 42 before entering the first indoor heat exchanger 09 for complete evaporation.

[0077] Continue reading Figure 1 In the above embodiments, the outdoor heat exchanger assembly includes a first outdoor heat exchanger 36 and a second outdoor heat exchanger 37, which are connected in parallel. Their first ends are connected via a multi-way valve 33, and their second ends can be directly connected to the suction port 012 of the compressor 01 or connected to the suction port 012 of the compressor 01 via a reversing valve assembly. The second ends of the first indoor heat exchanger 09 and the second indoor heat exchanger 10 are connected to the multi-way valve 33. The throttling assembly includes a throttling valve assembly 35 disposed at the first end of the outdoor heat exchanger assembly. The multi-way valve 33 and the first ends of the outdoor heat exchanger assemblies, i.e., the first outdoor heat exchanger 36 and the second outdoor heat exchanger 37, are connected in series with a shut-off valve 34 and a filter assembly 40 as needed. The filter assembly 40 is typically disposed on both sides of the throttling valve assembly 35. Similarly, the second ends of the first outdoor heat exchanger 36 and the second outdoor heat exchanger 37 are connected in series with a shut-off valve 34 and a filter assembly 40 as needed. In addition, temperature detection elements 24 are provided at both ends of the first outdoor heat exchanger 36 and the second outdoor heat exchanger 37 to adjust and control the operation of the compressor 01 and the entire system according to the detected temperature.

[0078] See Figure 4 In another embodiment provided in this application, the outdoor heat exchanger assembly may include only the first outdoor heat exchanger 36, and the throttling assembly includes a throttling valve group 35 disposed at the first end of the first outdoor heat exchanger 36. The first end of the first outdoor heat exchanger 36 is provided with a shut-off valve 34 and a filter assembly 40 connected in series as needed, and the filter assembly 40 is disposed on both sides of the throttling valve group 35. The second end of the first outdoor heat exchanger 36 is provided with a shut-off valve 34 and a filter assembly 40 connected in series as needed. In addition, both ends of the first outdoor heat exchanger 36 are provided with temperature detection elements 24, so as to adjust and control the operation of the compressor 01 and the entire system according to the detected temperature.

[0079] Continue reading Figure 1 In some embodiments, the reversing valve assembly includes four sets of four-way valves: a first four-way valve 04, a second four-way valve 05, a fourth four-way valve 07, and a fifth four-way valve 08. Each four-way valve includes four ports: C, D, E, and S. Each four-way valve is connected to the suction port 012 of the compressor 01 via port D. The C and S ports of the first four-way valve 04 are connected via a first capillary tube 25, and its E port is connected to the first end of the first indoor heat exchanger 09. The C and S ports of the second four-way valve 05 are connected via a second capillary tube 26. The S port of the second four-way valve 05 is connected to the medium-pressure suction port 013 of the compressor 01, and its E port is connected to the gaseous refrigerant outlet 311. The C port of the fourth four-way valve 07 is connected to the first end of the first outdoor heat exchanger 36, and its E and S ports are connected via a fourth capillary tube 28. The C port of the fifth four-way valve 08 is connected to the first end of the second outdoor heat exchanger 37, and the E and S ports of the fifth four-way valve 08 are connected through the fifth capillary tube 29. The throttling assembly includes a first throttling valve 13 located at the second end of the first indoor heat exchanger 09 and a second throttling valve 14 located at the second end of the second indoor heat exchanger 10. At this time, one end of the first throttling branch 41 is connected to the liquid refrigerant outlet 312, and the other end is connected between the first indoor heat exchanger 09 and the first branch throttling valve 42.

[0080] like Figure 2 When the system reheat load is relatively large, the second indoor heat exchanger 10 switches to high-pressure reheat state, all four-way valves switch to D and E ports open, C and S ports open, the first branch throttle valve 42 closes, and the first throttle branch 41 disconnects. Due to the arrangement of the first capillary tube 25, the fourth capillary tube 28, and the fifth capillary tube 29, the exhaust gas from the compressor 01 does not flow to the outdoor heat exchanger assembly and the first indoor heat exchanger 09. Instead, it flows into the flash evaporator 31 through the second four-way valve 05 and the gaseous refrigerant outlet 311. Furthermore, due to the arrangement of the second capillary tube 26, very little gaseous refrigerant flows to the medium-pressure extraction port 013 of the compressor 01 (which can be ignored). The vast majority of the refrigerant flows to the second indoor heat exchanger 10 for condensation and reheating through the liquid refrigerant inlet 313. After that, it is throttled by the second throttling valve 14 at the second end of the second indoor heat exchanger 10 and throttled a second time by the first throttling valve 13 at the second end of the first indoor heat exchanger 09. Finally, it all flows into the first indoor heat exchanger 09 for evaporation.

[0081] like Figure 3When the system reheat load is low, the second indoor heat exchanger 10 switches to medium-pressure reheat mode. All four-way valves switch to connect ports C and D, and ports E and S. The first branch throttling valve 42 opens, and the first throttling branch 41 is open. Due to the effect of the second capillary tube 26, the exhaust gas from compressor 01 is difficult to pass through the second four-way valve 05. The refrigerant entering the medium-pressure extraction port 013 of compressor 01 after being throttled by the second capillary tube 26 is negligible. Almost all the refrigerant from the exhaust port 011 of compressor 01 flows to the first outdoor heat exchanger 36 and the second outdoor heat exchanger 37 through the fourth four-way valve 07 and the fifth four-way valve 08 for condensation. The condensed refrigerant is throttled by the throttling valve group 35 at the first end of the outdoor heat exchanger assembly and then flows through the multi-way valve 33 and the shut-off valve 34 in sequence before being divided into two paths; one path flows through the first branch... The refrigerant flows into the first indoor heat exchanger 09 through the flow valve 13 for evaporation. Since the second indoor heat exchanger 10 is located downstream of the air outlet of the first indoor heat exchanger 09, another refrigerant enters the second indoor heat exchanger 10 for condensation and reheating after being throttled by the second throttling valve 14. The reheated refrigerant flows into the flash evaporator 31 through the liquid refrigerant inlet 313. The gaseous refrigerant flows into the medium-pressure suction port 013 of the compressor 01 from the gaseous refrigerant outlet 311 and the second four-way valve 05. The liquid refrigerant enters the first indoor heat exchanger 09 for complete evaporation after being throttled by the first throttling branch 41 and the first branch throttling valve 42. The flash evaporator 31, the first four-way valve 04, the medium-pressure exhaust port 013, the first throttling branch 41, and the first branch throttling valve 42 effectively ensure that the system can switch to medium-pressure reheat mode, improve the adjustment range of the system's reheat capacity, and at the same time prevent the accumulation of liquid refrigerant in the second indoor heat exchanger 10 during condensation and reheating, ensuring the flow rate of the circulating refrigerant in the system and improving the stability of system operation.

[0082] In the above embodiments, the second ends of the first outdoor heat exchanger 36 and the second outdoor heat exchanger 37 can be connected to the exhaust port 011 of the compressor 01 not only through the fourth four-way valve 07 and the fifth four-way valve 08, but also through a two-way valve or directly to the exhaust port 011 of the compressor 01. When the second ends of the first outdoor heat exchanger 36 and the second outdoor heat exchanger 37 are directly connected to the exhaust port 011 of the compressor 01, at least one set of shut-off valves 34 is provided between the second ends of the first outdoor heat exchanger 36 and the second outdoor heat exchanger 37 and the exhaust port 011 of the compressor 01, so that when the second indoor heat exchanger 10 is in a high-pressure reheat state, the exhaust gas of the compressor 01 does not pass through the outdoor heat exchanger assembly and directly enters the second indoor heat exchanger 10 first.

[0083] In some embodiments, a gas-liquid separator 02 is also included. The outlet of the gas-liquid separator 02 is connected to the suction port 012 of the compressor 01, and the inlet of the gas-liquid separator 02 is connected to the S port of the first four-way valve 04, the S port of the fourth four-way valve 07, and the S port of the fifth four-way valve 08. With the help of the gas-liquid separator 02, liquid slugging in the compressor 01 can be effectively avoided, the stability of system operation can be improved, and the service life of the compressor 01 can be extended.

[0084] In some embodiments, an oil separator 03 is provided between the exhaust port 011 of the compressor 01 and the reversing valve assembly, more specifically between the D ports of all four-way valves. The oil separator 03 is provided with an intake pipe, an exhaust pipe, and a return oil pipe at the bottom. The exhaust port 011 of the compressor 01 is connected to the intake pipe of the oil separator 03. The first four-way valve 04, the second four-way valve 05, the fourth four-way valve 07, and the fifth four-way valve 08 are all connected to the exhaust pipe of the oil separator 03 through the D ports. The return oil pipe at the bottom of the oil separator 03 is connected to the filter assembly 40 and the return oil capillary tube 30 and connected to the suction pipe of the compressor 01. The oil separator 03, the filter assembly 40, and the return oil capillary tube 30 can prevent the gaseous refrigerant returning to the compressor 01 from carrying too many liquid droplets, prevent the compressor 01 from liquid slugging, and at the same time have functions such as filtering, oil return, and liquid storage. Reducing the return of refrigerant oil can ensure sufficient lubrication of the compressor 01.

[0085] In some embodiments, a low-pressure sensor 19 is installed before the inlet of the gas-liquid separator 02 to detect the suction pressure of the compressor 01. A high-pressure sensor 16 and a high-pressure protection switch 18 are installed at the discharge port 011 of the compressor 01. The high-pressure sensor 16 detects the discharge pressure of the compressor 01, and the detected discharge pressure and the high-pressure protection switch 18 protect the compressor 01 and the system. Furthermore, a first temperature sensor 17 can be installed at the discharge port 011 of the compressor 01, a second temperature sensor 20 at the first end of the first indoor heat exchanger 09, a third temperature sensor 21 at the second end, a fourth temperature sensor 22 at the second end of the second indoor heat exchanger 10, and a fifth temperature sensor 23 at the air outlet of the second indoor heat exchanger 10. Temperature detection elements 24 are also installed at both ends of the outdoor heat exchanger assembly. The installation of these temperature sensors and temperature detection elements 24 facilitates adjusting the operating mode of the control system based on the detected temperature, thereby improving operating efficiency. Filter components 40 are provided at the second end of the first indoor heat exchanger 09, the second end of the second indoor heat exchanger 10, and both ends of the outdoor heat exchanger assembly to filter impurities carried in the refrigerant circulation, improve heat exchange efficiency, and extend the service life of the throttling components, reversing valve group, and compressor 01.

[0086] Furthermore, the indoor heat exchanger assembly is equipped with an indoor fan 12. The first indoor heat exchanger 09, the second indoor heat exchanger 10 and the indoor fan 12 are arranged in sequence to form an indoor air duct. The first indoor heat exchanger 09 is located upstream of the air duct and the second indoor heat exchanger 10 is located downstream of the air duct, so that the second indoor heat exchanger 10 can obtain a lower ambient temperature. The second indoor heat exchanger 10 can act as a reheater.

[0087] The outdoor heat exchanger assembly also includes an outdoor fan. When the outdoor heat exchanger assembly only includes a first outdoor heat exchanger 36, a set of first outdoor fans 38 is provided corresponding to the first outdoor heat exchanger 36, and the first outdoor fans 38, together with the first outdoor heat exchanger 36, form a first outdoor air duct. When the outdoor heat exchanger assembly also includes a second outdoor heat exchanger 37, a second outdoor fan 39 is provided corresponding to the second outdoor heat exchanger 37, and the second outdoor fans 39, together with the second outdoor heat exchanger 37, form a second outdoor air duct. The installation of outdoor fans enhances the heat exchange efficiency of the outdoor heat exchanger assembly and improves the cooling and heating capacity of the system.

[0088] See Figure 5 In another embodiment provided in this application, the indoor heat exchanger assembly further includes a third indoor heat exchanger 11, and the reversing valve group correspondingly includes a third four-way valve 06. The throttling assembly includes a third throttling valve 15 disposed at the second end of the third indoor heat exchanger 11. The third four-way valve 06 also includes ports C, D, E, and S. Ports C and S of the third four-way valve 06 are connected by a third capillary tube 27. Port D is connected to the exhaust port 011 of the compressor 01, and port E is connected to the first end of the third indoor heat exchanger 11. A second evaporation branch is disposed between the second end of the third indoor heat exchanger 11 and the liquid refrigerant outlet 312 of the flash evaporator 31. The throttling assembly also includes a second branch throttling valve 44 disposed in the second evaporation branch. The second evaporation branch is connected between the second end of the third indoor heat exchanger 11 and the third throttling valve 15.

[0089] At this time, the second indoor heat exchanger 10 is located downstream of the third indoor heat exchanger 11 along the air outlet direction of the indoor air duct, corresponding to the following three arrangement methods. First: The first indoor heat exchanger 09, the third indoor heat exchanger 11, the second indoor heat exchanger 10 and the indoor fan 12 are arranged sequentially along the indoor air duct, with the first indoor heat exchanger 09 located at the upstream of the indoor air outlet; Second: The first indoor heat exchanger 09 and the third indoor heat exchanger 11 are arranged side by side, and then arranged sequentially with the second indoor heat exchanger 10 and the indoor fan 12, with both the first indoor heat exchanger 09 and the third indoor heat exchanger 11 located at the upstream of the indoor air outlet; Third: The third indoor heat exchanger 11, the first indoor heat exchanger 09, the second indoor heat exchanger 10 and the indoor fan 12 are arranged sequentially, with the third indoor heat exchanger 11 located at the upstream of the indoor air outlet direction.

[0090] Regardless of the arrangement, the placement of the third indoor heat exchanger 11 further reduces the ambient temperature at the second indoor heat exchanger 10, increases the reheat capacity of the second indoor heat exchanger 10, and thus improves the system's reheat regulation range. Furthermore, the placement of the second evaporation branch and the second branch throttling valve 44 allows the third indoor heat exchanger 11 to share the liquid refrigerant generated during the reheating of the second indoor heat exchanger 10, further preventing refrigerant accumulation at the second indoor heat exchanger 10 and improving system operational stability. Whether the second indoor heat exchanger 10 is in a high-pressure reheating state or a medium-pressure reheating state, the refrigerant's operation in the third four-way valve 06, the third indoor heat exchanger 11, the third throttling valve 15, the third branch throttling valve, and the third throttling branch is exactly the same as the operation in the first four-way valve 04, the first indoor heat exchanger 09, the first throttling valve 13, the first branch throttling valve 42, and the first throttling branch 41, and will not be elaborated further here.

[0091] See Figure 6 In another embodiment provided in this application, the indoor heat exchanger assembly further includes a third indoor heat exchanger 11, the reversing valve group correspondingly includes a third four-way valve 06, and the throttling assembly includes a third throttling valve 15 disposed at the second end of the third indoor heat exchanger 11. The heat pump system further includes a second flash evaporation device 32, which correspondingly includes a second liquid refrigerant inlet 323, a second liquid refrigerant outlet 322, and a second gaseous refrigerant outlet 321. The third four-way valve 06 also includes ports C, D, E, and S. Ports C and S of the third four-way valve 06 are connected by a third capillary tube 27, port D is connected to the exhaust port 011 of the compressor 01, port E is connected to the second gaseous refrigerant outlet 321, and port S is connected to the medium-pressure extraction port 013 of the compressor 01. The second inlet 323 of the liquid refrigerant is connected to the first end of the third indoor heat exchanger 11, and the second outlet 322 of the liquid refrigerant is connected to the second end of the third indoor heat exchanger 11. The throttling assembly also includes a third branch throttling valve disposed in the third throttling branch. The third throttling branch is connected between the second end of the third indoor heat exchanger 11 and the third throttling valve 15.

[0092] At this time, the third indoor heat exchanger 11 is located downstream of the first indoor heat exchanger 09 along the air outlet direction of the indoor air duct, corresponding to the following three arrangement methods. First: The first indoor heat exchanger 09, the third indoor heat exchanger 11, the second indoor heat exchanger 10, and the indoor fan 12 are arranged sequentially along the indoor air duct, with the first indoor heat exchanger 09 located at the upstream of the air outlet of the indoor air duct; Second: The third indoor heat exchanger 11 and the second indoor heat exchanger 10 are arranged side by side, with the first indoor heat exchanger 09 located upstream of both along the air outlet direction of the indoor air duct, and the indoor fan 12 located at the downstream of the indoor air duct; Third: The first indoor heat exchanger 09, the second indoor heat exchanger 10, the third indoor heat exchanger 11, and the indoor fan 12 are arranged sequentially, with the third indoor heat exchanger 11 located at the downstream of the air outlet direction of the indoor air duct.

[0093] Regardless of the arrangement, the placement of the first indoor heat exchanger 09 lowers the ambient temperature at the third indoor heat exchanger 11, allowing the third indoor heat exchanger 11 to work in conjunction with the second indoor heat exchanger 10 as a reheater, thereby improving the system's reheat capacity regulation range. Furthermore, the placement of the second flash evaporator 32, the third evaporation branch, and the third branch throttling valve ensures that the liquid refrigerant generated during reheating of the third indoor heat exchanger 11 and the second indoor heat exchanger 10 can be completely evaporated through the first indoor heat exchanger 09, preventing refrigerant accumulation at the second indoor heat exchanger 10 and the third indoor heat exchanger 11, and improving the system's operational stability. Whether the second indoor heat exchanger 10 and the third indoor heat exchanger 11 are in high-pressure reheat or medium-pressure reheat state, the working process of the refrigerant in the third four-way valve 06, the second flash evaporator 32, the third indoor heat exchanger 11, the third throttle valve 15, the third branch throttle valve, and the third throttle branch is exactly the same as the working process in the second four-way valve 05, the flash evaporator 31, the second indoor heat exchanger 10, the second throttle valve 14, the second branch throttle valve 44, and the second throttle branch 43. It will not be explained in detail here.

[0094] This application also discloses an air conditioning device, including a control module and the heat pump system disclosed in the above embodiments. The control module is electrically connected to the compressor 01, reversing valve group, throttling component and corresponding temperature sensor and pressure sensor of the heat pump system, so as to adjust and switch different operating modes according to the actual environment. Other parts of the air conditioning device refer to the prior art, and will not be described in detail here.

[0095] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0096] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0097] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heat pump system, characterized in that, include: The compressor is equipped with an air intake port, an air exhaust port, and a medium-pressure air extraction port; An indoor heat exchanger assembly includes at least a first indoor heat exchanger and a second indoor heat exchanger, wherein the second indoor heat exchanger is located downstream of the air outlet direction of the first indoor heat exchanger. Outdoor heat exchanger assembly and throttling assembly; A reversing valve assembly is connected between the compressor, the indoor heat exchanger assembly, and the outdoor heat exchanger assembly to control the flow direction of refrigerant between the compressor, the indoor heat exchanger assembly, and the outdoor heat exchanger assembly, forming a refrigerant circuit. The flash evaporator is equipped with a liquid refrigerant inlet, a liquid refrigerant outlet, and a gaseous refrigerant outlet. The gaseous refrigerant outlet is connected to the medium-pressure exhaust port through the reversing valve group, and the liquid refrigerant inlet is connected to the first end of the second indoor heat exchanger. The first end of the first indoor heat exchanger is connected to the reversing valve assembly, and the second ends of both the first indoor heat exchanger and the second indoor heat exchanger are connected to the first end of the outdoor heat exchanger assembly. A first evaporation branch is connected between the second end of the first indoor heat exchanger and the liquid refrigerant outlet, and the throttling component includes a first branch throttling valve disposed in the first evaporation branch; The indoor heat exchanger assembly includes a third indoor heat exchanger located downstream of the first indoor heat exchanger in the air outlet direction. The heat pump system also includes a second flash evaporation device, which has a second liquid refrigerant inlet, a second liquid refrigerant outlet, and a second gaseous refrigerant outlet. The second gaseous refrigerant outlet is connected to the medium-pressure exhaust port through the reversing valve group. The second liquid refrigerant inlet is connected to the first end of the third indoor heat exchanger, and the second end of the third indoor heat exchanger is connected to the first end of the outdoor heat exchanger assembly. A third evaporation branch is connected between the second end of the first indoor heat exchanger and the second outlet of the liquid refrigerant, and the throttling assembly includes a third branch throttling valve disposed in the third evaporation branch.

2. The heat pump system according to claim 1, characterized in that, The indoor heat exchanger assembly includes a third indoor heat exchanger, and the second indoor heat exchanger is located downstream of the third indoor heat exchanger in the air outlet direction. The first end of the third indoor heat exchanger is connected to the reversing valve assembly, and the second end of the third indoor heat exchanger is connected to the first end of the outdoor heat exchanger assembly. A second evaporation branch is connected between the second end of the third indoor heat exchanger and the liquid refrigerant outlet, and the throttling assembly includes a second branch throttling valve disposed in the second evaporation branch.

3. The heat pump system according to any one of claims 1-2, characterized in that, The outdoor heat exchanger assembly includes a first outdoor heat exchanger and a second outdoor heat exchanger arranged in parallel. The first end of the first outdoor heat exchanger, the first end of the second outdoor heat exchanger, and the second end of the indoor heat exchanger assembly are connected by a multi-way valve.

4. The heat pump system according to claim 3, characterized in that, The reversing valve group includes a first four-way valve and a second four-way valve. Each four-way valve includes a C port, a D port, an E port, and an S port. Each four-way valve is connected to the suction port of the compressor through the D port. The first capillary tube is connected between the C port and the S port of the first four-way valve, and the E port of the first four-way valve is connected to the first end of the first indoor heat exchanger. The second capillary tube is connected between the C port and the S port of the second four-way valve. The S port of the second four-way valve is connected to the medium-pressure suction port, and the E port is connected to the gaseous refrigerant outlet. Furthermore, when a third indoor heat exchanger is also present, the reversing valve group also includes a third four-way valve, with a third capillary tube connected between the C port and the S port of the third four-way valve, and the E port of the third four-way valve connected to the first end of the third indoor heat exchanger. Furthermore, when a third indoor heat exchanger and a second flash evaporator are present simultaneously, the reversing valve group also includes a third four-way valve. The C port and S port of the third four-way valve are connected to a third capillary tube. The S port of the third four-way valve is connected to the medium-pressure exhaust port, and the E port is connected to the second outlet of the gaseous refrigerant.

5. The heat pump system according to claim 4, characterized in that, It also includes a gas-liquid separator, the outlet of which is connected to the suction port of the compressor, and the inlet of which is connected to the S port of the first four-way valve.

6. The heat pump system according to claim 5, characterized in that, A low-pressure sensor is installed before the inlet of the gas-liquid separator, and a high-pressure sensor and a high-pressure protection switch are installed at the exhaust port of the compressor.

7. The heat pump system according to claim 1, characterized in that, The heat pump system satisfies at least one of the following: The compressor's exhaust port is equipped with a first temperature sensor; The first end of the first indoor heat exchanger is provided with a second temperature sensor, and the second end of the first indoor heat exchanger is provided with a third temperature sensor. The second end of the second indoor heat exchanger is equipped with a fourth temperature sensor; The outdoor heat exchanger assembly has heat equalization temperature detection elements at both ends. An oil separator is provided between the exhaust port of the compressor and the reversing valve group, and a first filter and an oil return capillary are provided between the oil return pipe of the oil separator and the intake port of the compressor. A filter assembly is provided at the second end of the indoor heat exchanger assembly and at least one end of the outdoor heat exchanger assembly.

8. The heat pump system according to claim 1, characterized in that, The throttling assembly includes a first throttling valve located at the second end of the first indoor heat exchanger, a second throttling valve located at the second end of the second indoor heat exchanger, and a throttling valve group located at the first end of the outdoor heat exchanger assembly. One end of the first evaporation branch is connected between the second end of the first indoor heat exchanger and the first throttling valve.

9. The heat pump system according to claim 1, characterized in that, The indoor heat exchanger assembly also includes an indoor fan. The first indoor heat exchanger, the second indoor heat exchanger, and the indoor fan are arranged sequentially to form an indoor air duct. A fifth temperature sensor is provided between the second indoor heat exchanger and the indoor fan.

10. The heat pump system according to claim 3, characterized in that, The outdoor heat exchanger assembly also includes a first outdoor fan and a second outdoor fan. The first outdoor fan works with the first outdoor heat exchanger to form a first outdoor air duct, and the second outdoor fan works with the second outdoor heat exchanger to form a second outdoor air duct.

11. An air conditioning device, characterized in that, The system includes a control module and a heat pump system as described in any one of claims 1-10, wherein the control module is electrically connected to the compressor, the reversing valve assembly, and the throttling assembly.

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