Liquid supplementing type heat exchanger and heat exchange system

Abstract

The utility model discloses a liquid supplementing type heat exchanger and a heat exchange system.The heat exchanger comprises a main body, a heat exchange cavity is formed in the main body, the main body is provided with a first port, a second port and a liquid supplementing port, and the first port and the second port communicate with the heat exchange cavity and are arranged at the starting end and the tail end of the heat exchange process correspondingly; when the liquid supplementing type heat exchanger is used as an evaporator, the first port is a refrigerant inlet, the second port is a refrigerant outlet, and the liquid supplementing port is arranged close to the second port. According to the heat exchanger, part of the liquid refrigerant or the gas-liquid two-phase mixed refrigerant is supplemented to the position, close to the refrigerant outlet, of the heat exchanger, the refrigerant in the superheated state is condensed into the gas-liquid two-phase mixed refrigerant, the proportion of superheated refrigerant gas in the heat exchanger can be reduced when the heat exchanger serves as an evaporator, the heat exchange coefficient is increased, and the heat exchange amount is increased.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchangers, and in particular to a liquid-infusion heat exchanger and a heat exchange system. Background Art

[0002] The heat transfer coefficient of the refrigerant in the evaporator changes with the evaporation process of the refrigerant. The heat transfer coefficient changes with the evaporation of the refrigerant as follows: Figure 1 As shown in the figure, a shell-and-tube heat exchanger (TBHE) acts as an evaporator during cooling. A two-phase gas-liquid refrigerant flows upward from the bottom of the tube, exchanging heat. At the bottom of the tube, the gas-liquid refrigerant evaporates and boils continuously before flowing out of the tube as superheated gas at the top. This refrigerant evaporation process involves a phase change. From the evaporator inlet to the evaporator outlet, the refrigerant gradually transitions from a gas-liquid mixed phase to a saturated state and finally to a superheated state. During this process, the heat transfer coefficient of the gas-liquid refrigerant far exceeds that of the gaseous refrigerant (the heat transfer coefficient of the gas-liquid refrigerant is approximately 2500 to 100,000 W / (m²*k), while the heat transfer coefficient of the gaseous refrigerant is only approximately 25 to 250 W / (m²*k)). This means that the heat transfer coefficient gradually decreases during the heat exchange process. With continued use, the heat transfer efficiency is low, failing to meet the system's heat transfer requirements. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a liquid-supplementing heat exchanger and a heat exchange system, which can reduce the proportion of superheated refrigerant gas inside the heat exchanger when it is used as an evaporator by adding part of the liquid refrigerant or the gas-liquid two-phase mixed refrigerant to the position near the refrigerant outlet of the heat exchanger, and condense the superheated refrigerant into a gas-liquid two-phase mixed refrigerant. The heat exchange coefficient is improved and the heat exchange amount is increased.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] On the one hand, a liquid replenishment heat exchanger is provided, comprising: a main body, a heat exchange cavity formed therein, a first port, a second port and a liquid replenishment port being provided on the main body, the first port and the second port being respectively connected to the heat exchange cavity, and being respectively provided at the starting end and the end end of the heat exchange process, when the liquid replenishment heat exchanger is used as an evaporator, the first port is the refrigerant inlet, the second port is the refrigerant outlet, and the liquid replenishment port is provided close to the second port.

[0006] Furthermore, a third port and a fourth port are also provided on the main body, the third port is arranged close to the first port, and the fourth port is arranged close to the second port, wherein, when the first port is the refrigerant inlet and the second port is the refrigerant outlet, the third port serves as the outlet of the heat exchange medium, and the fourth port serves as the inlet of the heat exchange medium.

[0007] Furthermore, the heat exchange medium is water or air.

[0008] On the other hand, a heat exchange system is also provided, including: a compressor, a first heat exchanger, a throttling device, a first liquid replenishing valve and the liquid replenishing heat exchanger as described above, the compressor having a fifth port and a sixth port, the first heat exchanger having a seventh port and an eighth port, the second port being connected to the fifth port, the sixth port being connected to the seventh port, the eighth port being connected to the first port through a first pipeline, the throttling device being arranged on the first pipeline, the first pipeline being connected to the liquid replenishing port through a first branch pipeline, and the first liquid replenishing valve being arranged on the first branch pipeline.

[0009] Furthermore, the first heat exchanger is further provided with a liquid inlet, the first pipeline is connected to the liquid inlet via a second branch pipeline, and a second liquid replenishing valve is provided on the second branch pipeline.

[0010] Furthermore, the heat exchange system is configured as follows: the refrigerant is transported to the first branch pipeline or the second branch pipeline through the throttling device; or a portion of the refrigerant is directly transported to the first branch pipeline or the second branch pipeline, and the remaining portion is transported backward through the throttling device.

[0011] Furthermore, when the liquid replenishment heat exchanger is used as an evaporator, the first heat exchanger is used as a condenser, and the heat exchange system is configured as follows: the second liquid replenishment valve is closed and the first liquid replenishment valve is opened.

[0012] Furthermore, when the liquid replenishment heat exchanger is used as a condenser, the first heat exchanger is used as an evaporator, and the heat exchange system is configured as follows: the first liquid replenishment valve is closed, and the second liquid replenishment valve is opened.

[0013] Furthermore, the first liquid replenishing valve is a one-way valve, a solenoid valve or an electronic expansion valve; and / or the second liquid replenishing valve is a one-way valve, a solenoid valve or an electronic expansion valve.

[0014] Furthermore, the liquid-supplementing heat exchanger is a plate heat exchanger, a shell and tube heat exchanger, a fin heat exchanger or a sleeve and tube heat exchanger.

[0015] The beneficial effects of the present application are: in the heat exchange process, the gas-liquid mixed two-phase refrigerant enters the heat exchange cavity from the first port (refrigerant inlet) and flows upward along the cavity. As the refrigerant gradually evaporates, its state gradually changes from gas-liquid two-phase to superheated state, and the heat exchange coefficient also gradually decreases. To overcome this challenge, the liquid supplementing heat exchanger is provided with a liquid supplementing port near the second port (refrigerant outlet). When the refrigerant approaches the outlet, part of the refrigerant is already in a superheated state. At this time, liquid refrigerant or gas-liquid two-phase mixed refrigerant is supplemented into the heat exchange cavity through the liquid supplementing port, and the newly supplemented refrigerant exchanges heat with the superheated refrigerant, causing the superheated refrigerant to condense back to a gas-liquid two-phase mixed state. This liquid supplementing process not only reduces the proportion of superheated refrigerant gas in the heat exchanger, but also significantly increases the proportion of gas-liquid two-phase refrigerant, thereby greatly increasing the heat exchange coefficient.

[0016] Due to the increase in heat exchange coefficient, the liquid supplementing heat exchanger can transfer more heat in the same heat exchange area and time, i.e. increase the heat exchange amount. At the same time, the heat exchange efficiency is also significantly improved, which helps to reduce energy consumption and improve the energy efficiency ratio of the entire refrigeration system. In addition, the liquid supplementing heat exchanger also has high flexibility, and can adjust the liquid supplementing amount and liquid supplementing time according to actual needs to flexibly cope with different heat exchange demands. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described in detail below according to the drawings and examples.

[0018] Figure 1 The relationship between the internal refrigerant state and the heat exchange coefficient of the conventional evaporator described in the embodiments of the present application;

[0019] Figure 2 The relationship between the internal refrigerant state and the heat exchange coefficient of the liquid supplementing heat exchanger described in the embodiments of the present application;

[0020] Figure 3 The front view of the liquid supplementing heat exchanger described in the embodiments of the present application;

[0021] Figure 4 The refrigerant flow direction diagram of the heat exchange system in the refrigeration state described in the embodiments of the present application Figure 1 ;

[0022] Figure 5 The refrigerant flow direction diagram of the heat exchange system in the refrigeration state described in the embodiments of the present application Figure 2 ;

[0023] Figure 6 The refrigerant flow direction diagram of the heat exchange system in the heating state described in the embodiments of the present application Figure 1 ;

[0024] Figure 7 The refrigerant flow direction diagram of the heat exchange system in the heating state described in the embodiments of the present application Figure 2.

[0025] In the figure: 1. main body; 2. first port; 3. second port; 4. liquid replenishing port; 5. third port; 6. fourth port; 110. liquid replenishing heat exchanger; 120. compressor; 1201. fifth port; 1202. sixth port; 130. first heat exchanger; 1301. seventh port; 1302. eighth port; 1303. liquid inlet; 140. throttling element; 150. first liquid replenishing valve; 160. second liquid replenishing valve; 170. first branch pipeline; 180. second branch pipeline; 190. first pipeline. DETAILED DESCRIPTION

[0026] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0027] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] like Figure 3As shown, this embodiment provides a liquid replenishment heat exchanger 110, including: a main body 1, a heat exchange cavity is formed inside, and a first port 2, a second port 3 and a liquid replenishment port 4 are provided on the main body 1. The first port 2 and the second port 3 are respectively connected to the heat exchange cavity and are respectively arranged at the starting end and the end end of the heat exchange process. When the liquid replenishment heat exchanger 110 is used as an evaporator, the first port 2 is the refrigerant inlet, the second port 3 is the refrigerant outlet, and the liquid replenishment port 4 is arranged close to the second port 3.

[0030] Based on the above scheme, the heat exchanger includes a main body 1, which is designed with a heat exchange cavity inside. The main body 1 is respectively provided with a first port 2, a second port 3 and a unique liquid replenishment port 4. When used as an evaporator, the first port 2 serves as the refrigerant inlet, and the second port 3 serves as the refrigerant outlet, and the liquid replenishment port 4 is cleverly arranged near the refrigerant outlet. During the heat exchange process, a two-phase refrigerant of gas-liquid mixture enters the heat exchange cavity from the first port 2 (refrigerant inlet) and flows upward along the cavity. As the refrigerant gradually evaporates, its state gradually changes from gas-liquid two-phase to an overheated state, and the heat transfer coefficient gradually decreases accordingly. In order to overcome this challenge, the liquid replenishment heat exchanger 110 is provided with a liquid replenishment port 4 near the second port 3 (refrigerant outlet). When the refrigerant approaches the outlet, part of the refrigerant is already in an overheated state. At this time, liquid refrigerant or gas-liquid two-phase mixed refrigerant is added to the heat exchange chamber through the liquid filling port 4. The newly added refrigerant exchanges heat with the superheated refrigerant, causing the superheated refrigerant to condense back into a gas-liquid two-phase mixed state. This liquid filling process not only reduces the proportion of superheated refrigerant gas in the heat exchanger, but also significantly increases the proportion of gas-liquid two-phase refrigerant, thereby greatly improving the heat transfer coefficient. The heat exchange system in the heat exchanger changes with the evaporation of the refrigerant as shown in the following example. Figure 2 As shown. Due to the improved heat transfer coefficient, the liquid-injection heat exchanger 110 can transfer more heat within the same heat exchange area and time, thereby increasing the heat transfer capacity. Simultaneously, heat transfer efficiency is significantly improved, helping to reduce energy consumption and improve the energy efficiency of the entire refrigeration system. Furthermore, the liquid-injection heat exchanger 110 is highly flexible, allowing the amount and timing of liquid infusion to be adjusted according to actual needs, flexibly responding to varying heat exchange requirements.

[0031] In summary, the liquid-injection heat exchanger 110 effectively improves the heat transfer coefficient and heat transfer amount through its unique liquid-injection design, improves the heat transfer efficiency, and increases the flexibility and service life of the system. This innovative design provides an effective solution to the problem of decreased heat transfer coefficient in traditional shell-and-tube heat exchangers.

[0032] Furthermore, the main body 1 is also provided with a third port 5 and a fourth port 6. The third port 5 is arranged near the first port 2, and the fourth port 6 is arranged near the second port 3. When the first port 2 is the refrigerant inlet and the second port 3 is the refrigerant outlet, the third port 5 serves as the outlet of the heat exchange medium, and the fourth port 6 serves as the inlet of the heat exchange medium. When the liquid-injection heat exchanger 110 is used as an evaporator, the first port 2 serves as the inlet of the refrigerant, the second port 3 serves as the outlet of the refrigerant, and the third port 5 and the fourth port 6 serve as the outlet and inlet of the heat exchange medium, respectively. It is worth noting that the fourth port 6 is cleverly arranged near the second port 3 to ensure that the heat exchange medium and the refrigerant form a countercurrent heat exchange layout. During the countercurrent heat exchange process, after the refrigerant enters the heat exchange cavity from the first port 2, it flows upward along the cavity and gradually evaporates, while releasing heat. The heat exchange medium enters from the fourth port 6 and flows downward in the opposite direction of the refrigerant, absorbing the heat released by the refrigerant and gradually heating up. This countercurrent heat exchange design keeps the temperature difference between the refrigerant and the heat exchange medium at a high level throughout the heat exchange process, thereby significantly improving the heat exchange efficiency.

[0033] Furthermore, the liquid-replenishing heat exchanger 110 utilizes a refill port 4 to timely replenish liquid or gas-liquid two-phase refrigerant based on the refrigerant's evaporation and overheating conditions, thereby maintaining a high heat transfer coefficient within the heat exchange chamber. This design not only further enhances heat exchange efficiency but also optimizes the heat exchange process, reduces heat loss, and improves the system's energy efficiency.

[0034] The heat exchange medium is a fluid other than refrigerant, such as water or air. By using water or air as the heat exchange medium, the liquid-injection heat exchanger 110 can meet the needs of various application scenarios. For example, in systems that require cooling or heating water, the liquid-injection heat exchanger 110 can serve as a highly efficient heat exchange device. It can also perform well in applications requiring air temperature regulation, such as air conditioning systems or industrial cooling systems.

[0035] Furthermore, the vertical positions of the first port 2 and the second port 3 can be swapped, and the positions of the third port 5 and the fourth port 6 can also be swapped. This swapping refers to the reversal of the inlet and outlet directions of the refrigerant and heat exchange medium, allowing for adjustments to the flow direction based on actual layout requirements to accommodate different usage scenarios. Furthermore, the liquid-injection heat exchanger 110 can be made of brass, aluminum, stainless steel, or other materials, without limitation.

[0036] On the other hand, a heat exchange system is also provided, comprising: a compressor 120, a first heat exchanger 130, a throttling member 140, a first liquid replenishing valve 150, and the liquid replenishing heat exchanger 110 as described above, wherein the compressor 120 has a fifth port 1201 and a sixth port 1202, the first heat exchanger 130 has a seventh port 1301 and an eighth port 1302, the second port 3 is connected to the fifth port 1201, the sixth port 1202 is connected to the seventh port 1301, and the eighth port 1302 is connected to the first port 2 via a first pipe 190. The throttling device 140 is arranged on the first pipeline 190, the first pipeline 190 is connected to the liquid inlet 4 through the first branch pipeline 170, and the first liquid inlet valve 150 is arranged on the first branch pipeline 170; the first heat exchanger 130 is also provided with a liquid inlet 1303, the first pipeline 190 is connected to the liquid inlet 1303 through the second branch pipeline 180, and the second liquid inlet valve 160 is provided on the second branch pipeline 180. During the flow process, part of the refrigerant is directly transported to the first branch pipeline 170, and the rest is transported backward through the throttling device 140.

[0037] Among them, Figure 4 As shown, during cooling, when the liquid replenishment heat exchanger 110 is used as an evaporator, the first heat exchanger 130 is used as a condenser, and the heat exchange system is configured as follows: the second liquid replenishment valve 160 is closed and the first liquid replenishment valve 150 is opened.

[0038] In this scheme, the high-temperature and high-pressure gas discharged from the compressor 120 is condensed by the first heat exchanger 130 (condenser) and becomes liquid refrigerant. At this time, the second refrigerant valve 160 is closed and the condenser is not refilled. Part of the refrigerant coming out of the condenser is throttled by the throttling device 140 and enters the liquid refill heat exchanger 110 (evaporator). At this time, the refrigerant flows from bottom to top inside. At the same time, another part of the refrigerant passes through the first refrigerant valve 150 in front of the throttling device 140 and enters the upper part of the evaporator. After mixing with the refrigerant inside the evaporator, it is discharged from the refrigerant outlet back to the compressor 120.

[0039] In addition, if Figure 5 As shown, under refrigeration conditions, the refrigerant is first throttled by the throttling device 140 during the flow process, and then transported to the first branch pipeline 170, that is, the replenishment position is drawn out from the pipeline position behind the throttling device 140, which is equivalent to replenishing the refrigerant after throttling by the throttling device 140.

[0040] As an optional specific implementation scheme, Figure 6As shown, during heating, when the liquid-replenishing heat exchanger 110 functions as a condenser, the first heat exchanger 130 functions as an evaporator. The heat exchange system is configured such that the first refill valve 150 is closed and the second refill valve 160 is open. When the liquid-replenishing heat exchanger 110 functions as a condenser, no refill is performed, and the first refill valve 150 is closed. A portion of the refrigerant exiting the condenser is throttled by the throttle element 140 and enters the first heat exchanger 130 (evaporator). The remaining portion of the refrigerant is directly delivered to the second branch line 180 and enters the evaporator through the liquid-replenishing port 1303.

[0041] In addition, if Figure 7 As shown, during heating, the refrigerant is throttled by the throttling element 140 and then enters the evaporator through the second refill valve 160, mixes with the refrigerant inside the evaporator, and is discharged from the refrigerant outlet back to the compressor 120;

[0042] Optionally, the first refill valve 150 is a one-way valve, solenoid valve, or electronic expansion valve; and / or the second refill valve 160 is a one-way valve, solenoid valve, or electronic expansion valve. A one-way valve ensures unidirectional flow of refrigerant, preventing backflow and protecting the system. A solenoid valve achieves rapid response and precise control through electromagnetic control, facilitating integration with the control system and enhancing intelligence. An electronic expansion valve can further adjust the refill volume based on system requirements, achieving precise flow control and optimizing heat exchange efficiency and energy consumption. These different types of refill valves can be flexibly selected based on the specific needs and application scenarios of the heat exchange system, which will help improve system flexibility, optimize performance, enhance stability, and reduce maintenance costs.

[0043] Furthermore, the liquid-injection heat exchanger 110 can be a plate heat exchanger, shell-and-tube heat exchanger, fin heat exchanger, or double-tube heat exchanger. Plate heat exchangers offer advantages such as high heat exchange efficiency, compact structure, light weight, and small footprint, making them suitable for systems with high requirements for heat exchange efficiency and space utilization. Their unique plate structure increases the contact area between the refrigerant and the heat exchange medium, thereby improving heat exchange efficiency.

[0044] Shell and tube heat exchangers are structurally robust and can withstand high pressures and temperatures, making them suitable for systems with demanding operating pressures and temperatures. The heat transfer tube bundles in a shell and tube heat exchanger are typically located within the shell, with the refrigerant flowing through the tubes and the heat transfer medium flowing between the shell and the tube bundle to achieve heat exchange.

[0045] Finned heat exchangers increase heat transfer area and efficiency by adding fins. They are typically used for air-to-air or air-to-liquid heat transfer and are suitable for systems requiring efficient heat dissipation or heating, such as air conditioning systems and cooling towers.

[0046] A double-tube heat exchanger consists of two layers of tubes, an inner and outer tube. The refrigerant flows in the inner tube, while the heat transfer medium flows in the annular gap between the outer and inner tubes. This type of heat exchanger offers advantages such as simple structure, ease of manufacture, and strong adaptability. It is suitable for systems with high requirements for the heat transfer medium or requiring specialized structures.

[0047] Different types of liquid-injection heat exchangers 110 have their own advantages and disadvantages. Selection requires comprehensive consideration based on the specific requirements of the heat exchange system, operating pressure, temperature range, heat transfer efficiency requirements, and cost. Choosing the right type of liquid-injection heat exchanger 110 will help improve the system's heat transfer efficiency, stability, and reliability, while reducing energy consumption and maintenance costs, thereby meeting the needs of various application scenarios.

[0048] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other positions or relationships are used solely for ease of description and simplified operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0049] Throughout this specification, references to terms such as "an embodiment" or "example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0050] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0051] The technical principles of the present application have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the present application and are not to be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present application without inventive effort, and such implementations will fall within the scope of protection of the present application.

Claims

1. A liquid-supplementing heat exchanger (110), characterized in that: include: A main body (1) is provided with a heat exchange cavity formed therein, and a first port (2), a second port (3) and a liquid replenishing port (4) are provided on the main body (1), the first port (2) and the second port (3) are respectively connected to the heat exchange cavity, and are respectively provided at the starting end and the end end of the heat exchange process, when the liquid replenishing heat exchanger (110) is used as an evaporator, the first port (2) is a refrigerant inlet, the second port (3) is a refrigerant outlet, and the liquid replenishing port (4) is provided close to the second port (3).

2. The liquid-compensation heat exchanger (110) according to claim 1, characterized in that: The main body (1) is further provided with a third port (5) and a fourth port (6), wherein the third port (5) is provided close to the first port (2), and the fourth port (6) is provided close to the second port (3), wherein when the first port (2) is a refrigerant inlet and the second port (3) is a refrigerant outlet, the third port (5) serves as an outlet for the heat exchange medium, and the fourth port (6) serves as an inlet for the heat exchange medium.

3. The liquid-compensation heat exchanger (110) according to claim 2, characterized in that: The heat exchange medium is water or air.

4. A heat exchange system, characterized in that: include: A compressor (120), a first heat exchanger (130), a throttling element (140), a first refill valve (150), and a refill type heat exchanger (110) according to any one of claims 1 to 3, wherein the compressor (120) has a fifth port (1201) and a sixth port (1202), the first heat exchanger (130) has a seventh port (1301) and an eighth port (1302), the second port (3) is connected to the fifth port (1201), the sixth port (1202) is connected to the seventh port (1301), and the eighth port (1302) is connected to the first port (2) via a first pipeline (190), the throttling element (140) is arranged on the first pipeline (190), the first pipeline (190) is connected to the refill port (4) via a first branch pipeline (170), and the first refill valve (150) is arranged on the first branch pipeline (170).

5. The heat exchange system according to claim 4, characterized in that: The first heat exchanger (130) is further provided with a liquid inlet (1303), the first pipeline (190) is connected to the liquid inlet (1303) via a second branch pipeline (180), and a second liquid replenishing valve (160) is provided on the second branch pipeline (180).

6. The heat exchange system according to claim 5, characterized in that: The heat exchange system is configured as follows: the refrigerant is transported to the first branch pipeline (170) or the second branch pipeline (180) through the throttling device (140); or a portion of the refrigerant is directly transported to the first branch pipeline (170) or the second branch pipeline (180), and the remaining portion is transported backward through the throttling device (140).

7. The heat exchange system according to claim 6, characterized in that: When the liquid replenishment heat exchanger (110) is used as an evaporator, the first heat exchanger (130) is used as a condenser, and the heat exchange system is configured such that: the second liquid replenishment valve (160) is closed, and the first liquid replenishment valve (150) is opened.

8. The heat exchange system according to claim 6, characterized in that: When the liquid replenishment heat exchanger (110) is used as a condenser, the first heat exchanger (130) is used as an evaporator, and the heat exchange system is configured such that: the first liquid replenishment valve (150) is closed, and the second liquid replenishment valve (160) is opened.

9. The heat exchange system according to claim 5, characterized in that: The first liquid replenishing valve (150) is a one-way valve, a solenoid valve or an electronic expansion valve; and / or the second liquid replenishing valve (160) is a one-way valve, a solenoid valve or an electronic expansion valve.

10. The heat exchange system according to claim 4, characterized in that: The liquid-replenishing heat exchanger (110) is a plate heat exchanger, a shell and tube heat exchanger, a fin heat exchanger or a sleeve and tube heat exchanger.

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