Direct cooling system and energy storage system

Abstract

The invention relates to a direct cooling system which comprises a compressor. A first heat exchanger; a second heat exchanger; a throttling element; the first heat regeneration part comprises a first flow channel and a second flow channel, the first flow channel and the second flow channel can exchange heat, the first flow channel communicates with the air suction side of the compressor, and the second flow channel communicates with the air exhaust side of the compressor; the first adjusting assembly comprises a second part and a third part; the first adjusting assembly can communicate with the first heat exchanger and the compressor and / or the first heat regeneration part and control the opening degree of the second part and the opening degree of the third part. The heat regenerator and the first adjusting assembly are arranged, the refrigerant is accurately controlled to exchange heat with the air suction side of the compressor before entering the first heat exchanger according to the system operation condition, the supercooling degree of the refrigerant on the high-pressure side of the system is improved, the refrigerant is kept at the low temperature after entering the first heat exchanger, and phase change of the refrigerant in the first heat exchanger is reduced; and good temperature uniformity of the first heat exchanger is ensured.

Description

Technical Field

[0001] This application relates to the field of cooling system technology, and in particular to a direct cooling system and its control method. Background Technology

[0002] In the field of direct-cooling air conditioning with energy storage, during cooling, the refrigerant cools the energy storage battery through a cold plate. However, because the phase change of the refrigerant in the cold plate is not uniform, the temperature uniformity of the cold plate is relatively poor, especially at the inlet and outlet positions. This further leads to poor cooling effect on the energy storage battery. In related technologies, adding a regenerator to the system can improve the cooling effect of the refrigeration system. However, during the operation of the direct-cooling system, the system's operating conditions are constantly changing. How to design the system so that the regenerator can adapt to changes in system parameters and better improve the temperature uniformity of the cold plate is an urgent problem to be solved in the industry. Summary of the Invention

[0003] To address the aforementioned issues, this application provides a direct cooling system with good temperature uniformity.

[0004] A direct cooling system includes: a compressor;

[0005] The first heat exchanger has its outlet connected to the suction side of the compressor.

[0006] The second heat exchanger has its inlet connected to the exhaust side of the compressor;

[0007] A throttling element connects the inlet of the first heat exchanger to the outlet of the second heat exchanger;

[0008] The first reheat section includes a first flow channel and a second flow channel. The first flow channel and the second flow channel are capable of heat exchange. The first flow channel is connected to the suction side of the compressor, and the second flow channel is connected to the discharge side of the compressor.

[0009] The first regulating component is connected to the first heat exchanger; the first regulating component also includes a second part, which is connected to the first flow channel; the first regulating component also includes a third part, which is connected to the compressor suction side; the first regulating component connects the first heat exchanger with the compressor and / or the first regenerating section, and controls the opening degree of the second and third parts.

[0010] This application includes a first regenerative section and a first regulating component. The first regulating component can precisely control a certain amount of refrigerant to exchange heat with the compressor suction side before entering the first heat exchanger, based on the system's operating conditions. This increases the subcooling of the refrigerant on the high-pressure side of the system, ensuring the refrigerant maintains a lower temperature after entering the first heat exchanger. This reduces phase change vaporization of the refrigerant in the first heat exchanger, ensuring the refrigerant remains in a gas-liquid mixed state throughout the first heat exchanger, uniformly distributing it across all areas, thus guaranteeing good temperature uniformity of the first heat exchanger. This application also provides an energy storage system, including...

[0011] compressor;

[0012] The first heat exchanger has its outlet connected to the suction side of the compressor.

[0013] The second heat exchanger has its inlet connected to the exhaust side of the compressor;

[0014] A throttling element connects the inlet of the first heat exchanger to the outlet of the second heat exchanger;

[0015] The first reheat section includes a first flow channel and a second flow channel. The first flow channel and the second flow channel are capable of heat exchange. The first flow channel is connected to the suction side of the compressor, and the second flow channel is connected to the discharge side of the compressor.

[0016] The first regulating component is connected to the first heat exchanger; the first regulating component also includes a second part, which is connected to the first flow channel; the first regulating component also includes a third part, which is connected to the compressor suction side;

[0017] The first regulating component can connect the first heat exchanger to the compressor and / or the first regenerating section, and control the opening degree of the second and third sections;

[0018] It also includes an energy storage battery, which can exchange heat with the first heat exchanger.

[0019] This application incorporates a regenerator and a first regulating component. The first regulating component can precisely control a certain amount of refrigerant to exchange heat with the compressor suction side before entering the first heat exchanger, based on the system's operating conditions. This increases the subcooling of the refrigerant on the high-pressure side of the system, ensuring that the refrigerant maintains a lower temperature after entering the first heat exchanger. This reduces the phase change of the refrigerant in the first heat exchanger, thereby ensuring good temperature uniformity of the refrigerant in the first heat exchanger and further improving the cooling effect of the energy storage battery.

[0020] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of Embodiment 1 of this application;

[0022] Figure 2 This is a schematic diagram of Embodiment 2 of this application;

[0023] Figure 3 This is a schematic diagram of Embodiment 3 of this application;

[0024] Figure 4 This is a schematic diagram of Embodiment 4 of this application;

[0025] Figure 5 This is a schematic diagram of Embodiment 5 of this application;

[0026] Figure 6 This is a schematic diagram of Embodiment 6 of this application;

[0027] Figure label:

[0028] 1-Compressor; 2-Oil separator;

[0029] 3, 5, 9, 12, 17 - Temperature and pressure sensors;

[0030] 4-Second heat exchanger; 6-Dryer filter; 7-Sight glass; 8-Liquid reservoir; 10-Throttling element;

[0031] 11-First heat exchanger;

[0032] 13-Connector;

[0033] 14-Liquid-Gas Separator; 16-Second Regulating Valve; 15-First Regulating Valve;

[0034] 18-First regenerating section; -First inlet 181; -First outlet 182; -Second inlet 183; -Second outlet 184;

[0035] 19-Electric heating device;

[0036] 20 - Third regulating valve; 21 - Fourth regulating valve; 22 - Second heat exchange section; 221 - Third inlet; 222 - Third outlet; 223 - Fourth inlet; 224 - Fourth outlet;

[0037] 23 - Fifth regulating valve;

[0038] 24 - Sixth regulating valve;

[0039] 25 - Heating component;

[0040] 26-Energy Storage Battery

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. Detailed Implementation

[0042] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0043] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0044] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0045] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0046] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0047] It should be understood that "connected" in this article should be interpreted broadly, such as "A connects to B", which includes both A directly connecting to B and A indirectly connecting to B.

[0048] Example 1

[0049] This application provides a direct cooling system, including:

[0050] Compressor 1;

[0051] The outlet of the first heat exchanger 11 is connected to the suction side of the compressor 1.

[0052] The inlet of the second heat exchanger 4 is connected to the exhaust side of the compressor 1.

[0053] Throttling element 10, which connects the inlet of the first heat exchanger 11 to the outlet of the second heat exchanger 4;

[0054] The first reheating section 18 includes a first flow channel and a second flow channel, which are capable of heat exchange. The first flow channel is connected to the suction side of the compressor 1, and the second flow channel is connected to the discharge side of the compressor 1.

[0055] In this embodiment, the first regenerating section 18 is a plate heat exchanger with two flow channels that can exchange heat with each other, preferably a regenerator. During use, the refrigerant becomes a high-temperature and high-pressure state after passing through the compressor 1, and further enters the second flow channel of the regenerator to exchange heat with the refrigerant on the suction side of the compressor 1, i.e., the first flow channel. Furthermore, the refrigerant in the first flow channel absorbs heat and has a certain degree of superheat, entering the suction side of the compressor 1, while the refrigerant in the second flow channel loses some heat and its temperature decreases. The refrigerant flows out from the outlet of the second flow channel and enters the second heat exchanger 4 for condensation, passing through the throttling element 10. Afterwards, the refrigerant enters the first heat exchanger 11 through the inlet. The first heat exchanger is preferably a cold plate. Due to the subcooling effect of the regenerator, the refrigerant temperature is lower, allowing more liquid to enter the first heat exchanger 11 and cool the load on the first heat exchanger 11, i.e., the energy storage battery. Because the liquid enters the first heat exchanger 11, and the phase change of the refrigerant is reduced under the subcooling effect, it can exist evenly in various positions of the first heat exchanger 11, improving the temperature uniformity of different areas of the cold plate, thereby improving the temperature uniformity of the energy storage battery and enhancing its cooling effect. In this embodiment, the first regenerator 18... This system has multiple functions. On the one hand, it improves the temperature uniformity of the first heat exchanger 11 and the energy storage battery, enhancing the cooling effect of the energy storage battery. On the other hand, because the phase change of the refrigerant is reduced within the first heat exchanger 11, the refrigerant has a lower superheat after exiting the first heat exchanger 11, resulting in a significant amount of liquid refrigerant. Even after passing through the liquid-gas separator 14, the compressor 1 still faces a considerable risk of liquid slugging. Therefore, the refrigerant after passing through the liquid-gas separator 14 enters the first flow channel of the regenerator. The first flow channel can provide heating for the refrigerant on the suction side of the compressor 1, giving it a higher superheat and improving the refrigerant gas flow on the suction side. The heat exchanger is more fully optimized, reducing the risk of liquid slugging in compressor 1 and ensuring the safety and stability of the system. In this embodiment, the outlet and inlet of the heat exchanger are not fixed and need to be flexibly determined according to their relative position to compressor 1. The exhaust side of compressor 1 is the high-pressure side, and the suction side is the low-pressure side. For the same heat exchanger, the interface that first connects to the exhaust side of compressor 1 is the inlet, and the other is the outlet. In other embodiments, the regenerator can be a coaxial tube, shell-and-tube, or tubular heat exchanger. In other embodiments, the first regenerator 18 can be integrated with the condenser into one component.

[0056] The first regulating component includes a first part connected to the first heat exchanger 11; the first regulating component also includes a second part connected to the first flow channel; the first regulating component also includes a third part connected to the suction side of the compressor 1; the first regulating component can connect the first heat exchanger 11 with the compressor 1 and / or the first regenerating section 18, and control the opening degree of the second part and the third part.

[0057] The first regulating assembly includes a first regulating valve 15 and a second regulating valve 16. The first regulating valve 15 includes a first part and a second part; the second regulating valve 16 includes a first part and a third part.

[0058] In this embodiment, the first regulating component can be a three-way regulating valve or a valve assembly composed of two or more two-way valves. Optionally, the connection path between the first heat exchanger 11 and the compressor 1 is defined as the first branch, and the connection path between the first heat exchanger 11 and the first inlet 181 is defined as the second branch. The first branch includes the first regulating valve 15, and the second branch includes the second regulating valve 16.

[0059] In this embodiment, the opening degrees of the first regulating valve 15 and the second regulating valve 16 are adjustable. When the opening degree of the first regulating valve 15 increases and the opening degree of the second regulating valve 16 decreases, more refrigerant will directly reach the suction side of the compressor 1 from the low-pressure section without passing through the regenerator. This is suitable for environments with good operating conditions, where the phase change of the refrigerant after condensation in the first heat exchanger 11 is small, and the compressor 1 does not experience liquid slugging. When the operating conditions are not ideal and the temperature uniformity of the first heat exchanger 11 is poor, it is necessary to decrease the opening degree of the first regulating valve 15 and increase the opening degree of the second regulating valve 16. The refrigerant will then pass through the regenerator and enter the suction side of the compressor 1, thereby providing some cooling to the refrigerant in the high-pressure section. After the refrigerant enters the first heat exchanger 11, the temperature is low, which can reduce the phase change and allow more liquid refrigerant to fill various areas of the first heat exchanger 11, thereby improving the temperature uniformity of the first heat exchanger 11. At the same time, after passing through the first regenerator, the refrigerant has been completely vaporized when it reaches the suction side of the compressor 1, reducing the risk of liquid slugging in the compressor 1.

[0060] In this embodiment, after the refrigerant exits from the first heat exchanger 11, it has two branches. The first branch bypasses the first regenerator and directly enters the suction side of the compressor 1. The second branch passes through the first regenerator before entering the suction side of the compressor 1. The first branch has a first regulating valve 15, and the second branch has a second regulating valve 16. The first regulating valve 15 and the second regulating valve 16 are proportional regulating valves, which can adjust the flow rate of the branch in which the valve is located. In actual use, temperature sensors and pressure sensors are installed at the outlet of the first heat exchanger 11 and the suction side of the compressor 1, which can adjust the flow rate according to the refrigerant flow. The superheat of the refrigerant is calculated in real time based on temperature and pressure. In actual testing, when the outlet superheat of the first heat exchanger 11 is around ℃, the refrigerant distribution in the first heat exchanger 11 is relatively uniform, the temperature distribution of the first heat exchanger 11 is relatively uniform, and the temperature uniformity is good. Therefore, the amount of refrigerant passing through the regenerator can be adjusted according to the outlet superheat of the first heat exchanger 11 to achieve more flexible and precise control. It can also be adjusted more flexibly according to the ambient temperature, improving system energy efficiency and economy. In other embodiments, the proportional valve may not be set or other valves may be used instead, all of which are within the protection scope of this application.

[0061] In this embodiment, after the refrigerant exits from the first heat exchanger 11, it has two branches. The first branch bypasses the regenerator and directly enters the suction side of the compressor 1. The second branch passes through the regenerator before entering the suction side of the compressor 1. The first branch has a first regulating valve 15, and the second branch has a second regulating valve 16. The first regulating valve 15 and the second regulating valve 16 are proportional regulating valves, which can adjust the flow rate of the branch to which the valve is located. In actual use, temperature sensors and pressure sensors are installed at the outlet of the first heat exchanger 11 and the suction side of the compressor 1, which can monitor the refrigerant temperature and pressure in real time. The superheat of the refrigerant is calculated. In actual testing, when the outlet superheat of the first heat exchanger 11 is at a certain temperature, the refrigerant distribution within the first heat exchanger 11 is relatively uniform, and the temperature distribution within the first heat exchanger 11 is relatively uniform with good temperature uniformity. Therefore, the amount of refrigerant passing through the regenerator can be adjusted according to the outlet superheat of the first heat exchanger 11, achieving more flexible and precise control. It can also be adjusted more flexibly according to the ambient temperature and system operating conditions, improving the temperature uniformity of the cold plate, improving system energy efficiency, and achieving better economic performance. In other embodiments, the proportional valve may not be provided or may be replaced by other valves, all of which are within the scope of protection of this application.

[0062] The first flow channel includes a first inlet 181 and a first outlet 182. The first inlet 181 is connected to the second part, and the first outlet 182 is connected to the suction port of the compressor 1. The second flow channel includes a second inlet 183 and a second outlet 184. The second inlet 183 is connected to the exhaust port of the compressor 1, and the second outlet 184 is connected to the inlet of the second heat exchanger 4.

[0063] In this embodiment, after the refrigerant comes out of the compressor 1, it first enters the regenerator through the second inlet 183. After being subcooled by the regenerator, it flows out from the second outlet 184 and enters the condenser. Since the refrigerant coming out of the compressor 1 exhaust port is a high-temperature and high-pressure gaseous refrigerant, the heat exchange efficiency in the first regenerator section 18 will be higher. Heat is transferred to the low-pressure side refrigerant through the first regenerator section 18. The refrigerant enters the cold plate through the condenser and the throttling element 10. The temperature is low, and the gas-liquid mixture of the refrigerant is more uniform. It can absorb more heat without being completely vaporized, which improves the temperature uniformity of the cold plate. At the same time, the low-pressure side refrigerant absorbs heat and vaporizes, and is drawn into the compressor 1 suction port, thereby reducing the probability of the compressor 1 being liquid-slugged.

[0064] Optionally, it also includes a liquid-gas separator 14, which is connected to the first heat exchanger 11 and is also connected to the first regulating valve 15 and the second regulating valve 16.

[0065] In this embodiment, a liquid-gas separator 14 is also included, which can initially separate the refrigerant from the first heat exchanger 11 into liquid and gas to prevent the compressor 1 from producing liquid slugging. When used in conjunction with the regenerator, it can effectively reduce the risk of liquid slugging in the compressor 1. In other embodiments, the liquid-gas separator 14 can also be located in other positions.

[0066] Optionally, it also includes a liquid reservoir 8, which is connected to the second outlet 184 of the second flow channel or the outlet of the second heat exchanger 4, and the liquid reservoir is also connected to the throttling element 10.

[0067] Optionally, it also includes an oil separator 2, which is connected to the exhaust side of the compressor 1, and the oil separator 2 is also connected to the second inlet 183 or the inlet of the second heat exchanger 4.

[0068] Oil separator 2 can separate oil and gas, ensuring the normal operation of compressor 1.

[0069] Optionally, a reservoir 8 is also included.

[0070] Optionally, it also includes an electric heating device 19, which is connected to the suction side of the compressor 1.

[0071] Example 2

[0072] The difference from Embodiment 1 is that, in this embodiment, the first flow channel includes a first inlet 181 and a first outlet 182, the first inlet 181 is connected to the second part, and the first outlet 182 is connected to the suction port of the compressor 1; the second flow channel includes a second inlet 183 and a second outlet 184, the second inlet 183 is connected to the outlet of the second heat exchanger 4, and the second outlet 184 is connected to the throttling element 10.

[0073] In this embodiment, the second outlet 184 is connected to the throttling element 10. After the refrigerant comes out of the compressor 1, it first passes through the second heat exchanger 4 for condensation, then enters the regenerator from the second inlet 183, and then flows from the second outlet 184 to the throttling element 10. In this embodiment, the refrigerant that has passed through the condenser has released some heat and become liquid. After passing through the first regenerating section 18, it enters the cold plate after being throttled by the throttling element 10, thereby increasing the subcooling of the refrigerant and improving the temperature uniformity.

[0074] Example 3

[0075] The difference from Embodiment 1 is that in this embodiment, a second regulating component and a second regenerating section 22 are also included. The second regenerating section 22 includes a third flow channel and a fourth flow channel. The third flow channel and the fourth flow channel can exchange heat. The third flow channel is connected to the suction side of the compressor 1, and the fourth flow channel is connected to the exhaust side of the compressor 1.

[0076] In this embodiment, a second regenerating section 22 and a second heat exchange component are also provided, which are easier to control and more precise than a solution with only one regenerating section.

[0077] It also includes a second regulating component, which includes a fourth part connected to the first heat exchanger 11; the second regulating component also includes a fifth part connected to the third flow channel; the second regulating component also includes a sixth part connected to the suction port of the compressor 1; the second regulating component can connect the first heat exchanger 11, the compressor 1 and the first regenerating section 18, and control the opening degree of the fifth and sixth parts.

[0078] The first regulating assembly includes a first regulating valve 15 and a second regulating valve 16. The first regulating valve 15 includes a first part and a second part; the second regulating valve 16 includes a first part and a third part.

[0079] The second regulating assembly includes a third regulating valve 20 and a fourth regulating valve 21. The third regulating valve 20 includes a fourth part and a fifth part; the fourth regulating valve 21 includes a fourth part and a sixth part.

[0080] In this embodiment, the second regulating component can be a scheme of two two-way valves, just like the first regulating component. This scheme is simpler to design and has a lower cost. Alternatively, it can be a three-way valve. Or, the first regulating component and the second regulating component can be different valves, such as a combination of a three-way valve and a two-way valve.

[0081] The third flow channel includes a third inlet 221 and a third outlet 222. The third inlet 221 is connected to the fifth part, and the third outlet 222 is connected to the suction port of the compressor 1. The fourth flow channel includes a fourth inlet 223 and a fourth outlet 224. The fourth inlet 223 is connected to the second heat exchanger 4, and the fourth outlet 224 is connected to the throttling element 10.

[0082] In this embodiment, the refrigerant first passes through the first regenerative section 18, then through the condenser, and finally through the second regenerative section 22. The second regenerative section 22 is located differently from the first regenerative section 18. The second flow channel of the first regenerative section 18 is located on the discharge side of the compressor 1, while the fourth flow channel of the second regenerative section 22 is located behind the second heat exchanger 4. During system circulation, the refrigerant temperature is higher on the discharge side of the compressor 1 and relatively lower after passing through the condenser. Therefore, the regenerative capabilities of the first regenerative section 18 and the second regenerative section 22 are different. With stronger heat recovery capability, the system can select to use either the first heat recovery section 18 or the second heat recovery section 22 according to the needs of the system by controlling the first and second adjustment components. This allows for more precise control, improves the flexibility of the system, and enhances the temperature uniformity of the first heat exchanger 11. In other embodiments, the third and fourth flow channels of the second heat recovery section 22 can be located in other positions, such as the second flow channel of the first heat recovery section 18 and the fourth flow channel of the second heat recovery section 22 being located entirely on the exhaust side of the compressor 1 or entirely on the rear side of the second heat exchanger 4.

[0083] In this embodiment, the opening degrees of the first regulating valve 15 and the second regulating valve 16 are adjustable. When the opening degree of the first regulating valve 15 increases and the opening degree of the second regulating valve 16 decreases, more refrigerant will directly reach the suction side of the compressor 1 from the low-pressure section without passing through the regenerator. This is suitable for environments with good operating conditions, where the phase change of the refrigerant after condensation in the first heat exchanger 11 is small, and the compressor 1 does not experience liquid slugging. When the operating conditions are not ideal and the temperature uniformity of the first heat exchanger 11 is poor, it is necessary to decrease the opening degree of the first regulating valve 15 and increase the opening degree of the second regulating valve 16. The refrigerant will then pass through the regenerator and enter the suction side of the compressor 1, thereby providing some cooling to the refrigerant in the high-pressure section. After the refrigerant enters the first heat exchanger 11, the temperature is low, which can reduce the phase change and allow more liquid refrigerant to fill various areas of the first heat exchanger 11, thereby improving the temperature uniformity of the first heat exchanger 11. At the same time, after passing through the first regenerator, the refrigerant has been completely vaporized when it reaches the suction side of the compressor 1, reducing the risk of liquid slugging in the compressor 1.

[0084] In this embodiment, after the refrigerant exits from the first heat exchanger 11, it has two branches. The first branch bypasses the first regenerator and directly enters the suction side of the compressor 1. The second branch passes through the first regenerator before entering the suction side of the compressor 1. The first branch has a first regulating valve 15, and the second branch has a second regulating valve 16. The first regulating valve 15 and the second regulating valve 16 are proportional regulating valves, which can adjust the flow rate of the branch in which the valve is located. In actual use, temperature sensors and pressure sensors are installed at the outlet of the first heat exchanger 11 and the suction side of the compressor 1, which can adjust the flow rate according to the refrigerant flow. The superheat of the refrigerant is calculated in real time based on temperature and pressure. In actual testing, when the outlet superheat of the first heat exchanger 11 is around ℃, the refrigerant distribution in the first heat exchanger 11 is relatively uniform, the temperature distribution of the first heat exchanger 11 is relatively uniform, and the temperature uniformity is good. Therefore, the amount of refrigerant passing through the regenerator can be adjusted according to the outlet superheat of the first heat exchanger 11 to achieve more flexible and precise control. It can also be adjusted more flexibly according to the ambient temperature, improving system energy efficiency and economy. In other embodiments, the proportional valve may not be set or other valves may be used instead, all of which are within the protection scope of this application.

[0085] In this embodiment, the opening degree of the third regulating valve 20 and the fourth regulating valve 21 can be adjusted to select the proportion of refrigerant entering the second regenerator according to the actual situation. Since the fourth flow channel of the second heat exchanger 4 is located behind the second heat exchanger 4, the refrigerant loses some heat after passing through the condensation effect of the second heat exchanger 4, and the regeneration effect is relatively weak. Therefore, when the environmental conditions are good, the opening degree of the third regulating valve 20 can be reduced and the opening degree of the fourth regulating valve 21 can be increased to make full use of the ambient temperature difference, so that the refrigerant reaches the corresponding temperature and improves the temperature uniformity of the first heat exchanger 11.

[0086] Example 4

[0087] The difference from Embodiment 3 is that, in this embodiment, the third flow channel includes a third inlet 221 and a third outlet 222, the third inlet 221 is connected to the fifth part, and the third outlet 222 is connected to the suction port of the compressor 1; the fourth flow channel includes a fourth inlet 223 and a fourth outlet 224, the fourth inlet 223 is connected to the third outlet 222, and the fourth outlet 224 is connected to the inlet of the second heat exchanger 4.

[0088] In this embodiment, the second inlet 183 of the first regenerative section 18 and the fourth inlet 223 of the second regenerative section 22 are both located in front of the second heat exchanger 4, i.e. the condenser, which can provide more sufficient regenerative capacity and improve the temperature uniformity of the cold plate.

[0089] Furthermore, it also includes a fifth regulating valve 23 and a sixth regulating valve 24, which can control whether the refrigerant passes through the second regenerator section 22.

[0090] Example 5

[0091] The difference from Embodiment 4 is that in this embodiment, the second inlet 183 of the first regenerating section 18 and the fourth inlet 223 of the second regenerating section 22 are both located after the second heat exchanger 4, i.e. the condenser, which can provide more sufficient regenerating capacity and improve the temperature uniformity of the cold plate.

[0092] Optionally, it also includes a liquid-gas separator 14, which is connected to the first heat exchanger 11 and is also connected to the first regulating valve 15 and the second regulating valve 16.

[0093] In this embodiment, a liquid-gas separator 14 is also included, which can initially separate the refrigerant from the first heat exchanger 11 into liquid and gas to prevent the compressor 1 from producing liquid slugging. When used in conjunction with the regenerator, it can effectively reduce the risk of liquid slugging in the compressor 1. In other embodiments, the liquid-gas separator 14 can also be located in other positions.

[0094] Optionally, it also includes a liquid reservoir 8, which is connected to the second outlet 184 of the second flow channel or the outlet of the second heat exchanger 4, and the liquid reservoir is also connected to the throttling element 10.

[0095] Optionally, it also includes an oil separator 2, which is connected to the exhaust side of the compressor 1, and the oil separator 2 is also connected to the second inlet 183 or the inlet of the second heat exchanger 4.

[0096] Oil separator 2 can separate oil and gas, ensuring the normal operation of compressor 1.

[0097] Optionally, it also includes an electric heating device 19, which is connected to the suction side of the compressor 1.

[0098] In this embodiment, an electric heating device 19 is also provided. Since the capacity of the regenerator is also limited, in the case of a multi-split system, there are multiple first heat exchangers 11. To ensure the temperature uniformity of multiple first heat exchangers 11, the requirements for the regenerator are very high. However, considering the size of the regenerator, it is generally not set to be too large. Therefore, in this case, the heat exchange capacity of the regenerator alone is not sufficient to achieve the purpose. Therefore, the compressor 1 is adjusted to increase its speed and / or the opening of the throttling element 10 is adjusted to allow more liquid refrigerant to enter the first heat exchanger 11, thereby ensuring the temperature uniformity of the first heat exchanger 11. Meanwhile, due to the increased refrigerant flow in the system, the regenerator and liquid-gas separator 14 cannot guarantee that the compressor 1 is drawing in a completely gaseous refrigerant. Therefore, temperature and pressure sensors are also installed on the compressor 1's suction side. When the capacity of the regenerator and liquid-gas separator 14 reaches its limit, it still cannot meet the requirements for suction superheat. At this time, electric heating needs to be turned on to reduce the risk of liquid slugging in the compressor 1. At the same time, it ensures the temperature uniformity of the first heat exchanger 11 in the case of multi-split systems and improves the cooling effect of the energy storage battery. In other embodiments, electric heating may not be provided or other means of heating may be used.

[0099] Example 6

[0100] An energy storage system, including

[0101] Compressor 1;

[0102] The outlet of the first heat exchanger 11 is connected to the suction side of the compressor 1.

[0103] The inlet of the second heat exchanger 4 is connected to the exhaust side of the compressor 1.

[0104] Throttling element 10, which connects the inlet of the first heat exchanger 11 to the outlet of the second heat exchanger 4;

[0105] The first reheating section 18 includes a first flow channel and a second flow channel, which are capable of heat exchange. The first flow channel is connected to the suction side of the compressor 1, and the second flow channel is connected to the discharge side of the compressor 1.

[0106] The first regulating component includes a first part connected to the first heat exchanger 11; the first regulating component also includes a second part connected to the first flow channel; the first regulating component also includes a third part connected to the suction side of the compressor 1; the first regulating component is capable of connecting the first heat exchanger 11 with the compressor 1 and / or the first regenerating section 18, and controlling the opening degree of the second part and the third part.

[0107] It also includes an energy storage battery 26, which is capable of exchanging heat with the first heat exchanger 11.

[0108] In this embodiment, the energy storage system includes an energy storage battery 26 and a cooling unit. The first heat exchanger 11 serves as an evaporator, and the second heat exchanger 4 serves as a condenser. The first heat exchanger 11 is in direct or indirect contact with the energy storage battery 26 to perform thermal management on the energy storage battery 26 and ensure that the energy storage battery 26 operates at a suitable temperature. By setting up a regenerator, the heat dissipation of the energy storage battery 26 can be made more uniform, achieving good temperature uniformity.

[0109] Optionally, a heating component 25 is also included, which is in contact with the surface of the energy storage battery 26.

[0110] In this embodiment, a heating component is added to the surface of the energy storage battery 26, which can be in direct or indirect contact. Specifically, a PTC heating film is attached to the side or other surface of the battery, which can heat the energy storage battery 26 in a low-temperature environment. In other embodiments, other heating methods such as electric heating wires can be used.

[0111] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A direct cooling system, characterized in that, include: Compressor (1); The inlet of the second heat exchanger (4) is connected to the exhaust side of the compressor (1); A throttling element (10) is connected to the inlet of the first heat exchanger (11) and the outlet of the second heat exchanger (4); The first reheating section (18) includes a first flow channel and a second flow channel. The first flow channel and the second flow channel are capable of heat exchange. The first flow channel is connected to the suction side of the compressor (1), and the second flow channel is connected to the discharge side of the compressor (1). The first regulating component is connected to the first heat exchanger (11); the first regulating component further includes a second part, which is connected to the first flow channel; the first regulating component further includes a third part, which is connected to the suction side of the compressor (1); the first regulating component connects the first heat exchanger (11) with the compressor (1) and / or the first regenerating section (18), and controls the opening degree of the second part and the third part.

2. The direct cooling system according to claim 1, characterized in that, The first flow channel includes a first inlet (181) and a first outlet (182), the first inlet (181) is connected to the second part, and the first outlet (182) is connected to the suction port of the compressor (1); the second flow channel includes a second inlet (183) and a second outlet (184), the second inlet (183) is connected to the exhaust port of the compressor (1), and the second outlet (184) is connected to the inlet of the second heat exchanger (4).

3. The direct cooling system according to claim 1, characterized in that, The first flow channel includes a first inlet (181) and a first outlet (182), the first inlet (181) is connected to the second part, and the first outlet (182) is connected to the suction port of the compressor (1); the second flow channel includes a second inlet (183) and a second outlet (184), the second inlet (183) is connected to the outlet of the second heat exchanger (4), and the second outlet (184) is connected to the throttling element (10).

4. The direct cooling system according to claim 2 or 3, characterized in that, It also includes a second regulating component and a second regenerating section (22), the second regenerating section (22) including a third flow channel and a fourth flow channel, the third flow channel and the fourth flow channel being able to exchange heat, the third flow channel being connected to the suction side of the compressor (1), and the fourth flow channel being connected to the exhaust side of the compressor (1).

5. A direct cooling system according to claim 4, characterized in that, It also includes a second regulating component, which is connected to the first heat exchanger (11); the second regulating component also includes a fifth part, which is connected to the third flow channel; the second regulating component also includes a sixth part, which is connected to the suction port of the compressor (1); the second regulating component is connected to the first heat exchanger (11), the compressor (1) and the first regenerating part (18), and controls the opening degree of the fifth and sixth parts.

6. A direct cooling system according to claim 5, characterized in that, The third flow channel includes a third inlet (221) and a third outlet (222), the third inlet (221) is connected to the fifth part, and the third outlet (222) is connected to the suction port of the compressor (1); the fourth flow channel includes a fourth inlet (223) and a fourth outlet (224), the fourth inlet (223) is connected to the second heat exchanger (4), and the fourth outlet (224) is connected to the throttling element (10).

7. A direct cooling system according to claim 5, characterized in that, The third flow channel includes a third inlet (221) and a third outlet (222), the third inlet (221) is connected to the fifth part, and the third outlet (222) is connected to the suction port of the compressor (1); the fourth flow channel includes a fourth inlet (223) and a fourth outlet (224), the fourth inlet (223) is connected to the third outlet (222), and the fourth outlet (224) is connected to the inlet of the second heat exchanger (4).

8. The direct cooling system according to claim 1 or 5, characterized in that, The first regulating assembly includes a first regulating valve (15) and a second regulating valve (16), wherein the first regulating valve (15) includes the second part; and the second regulating valve (16) includes the third part.

9. The direct cooling system according to claim 8, characterized in that, The second regulating assembly includes a third regulating valve (20) and a fourth regulating valve (21), wherein the third regulating valve (20) includes the fifth part and the fourth regulating valve (21) includes the sixth part.

10. A direct cooling system according to claim 2, characterized in that, It also includes a liquid-gas separator (14), which is connected to the first heat exchanger (11) and is also connected to the first regulating valve (15) and the second regulating valve (16).

11. A direct cooling system according to claim 1, characterized in that, It also includes an electric heating device (19) connected to the suction side of the compressor (1).

12. An energy storage system, characterized in that, include Compressor (1); The first heat exchanger (11) has its outlet connected to the suction side of the compressor (1); The inlet of the second heat exchanger (4) is connected to the exhaust side of the compressor (1); A throttling element (10) is connected to the inlet of the first heat exchanger (11) and the outlet of the second heat exchanger (4); The first regenerating section (18) includes a first flow channel and a second flow channel, which are capable of heat exchange. The first flow channel is connected to the suction side of the compressor (1), and the second flow channel is connected to the discharge side of the compressor (1). The first regulating component is connected to the first heat exchanger (11). The first regulating component also includes a second part, which is connected to the first flow channel. The first regulating component also includes a third part, which is connected to the suction side of the compressor (1). The first regulating component is capable of connecting the first heat exchanger (11) with the compressor (1) and / or the first regenerating section (18), and controlling the opening degree of the second and third parts. It also includes an energy storage battery (26) that can exchange heat with the first heat exchanger (11).

13. An energy storage system according to claim 12, characterized in that, It also includes a heating component (25) that is in contact with the energy storage battery (26).

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