Heat exchange unit, air conditioning system and air conditioning equipment

Abstract

The utility model relates to a heat exchange unit, an air conditioning system and air conditioning equipment, the heat exchange unit comprises a gas-liquid separator, a heat exchange device and a supercharging device, and the gas-liquid separator comprises a liquid refrigerant leading-out branch; the heat exchange device communicates with the liquid refrigerant leading-out branch and the oil liquid circulation pipeline and is used for achieving heat exchange between the refrigerant and the oil liquid in the heat exchange device. A refrigerant outlet of the heat exchange device is communicated with the refrigerant circulating pipeline through a supplementing pipeline; and the supercharging device is arranged on the supplementing pipeline. According to the heat exchange unit, the liquid refrigerant does not need to be heated through an electric heating component, and energy consumption generated when the liquid refrigerant remaining in the gas-liquid separator is utilized can be reduced; the supercharging device is arranged on the supplementing pipeline, so that the refrigerant output by the supplementing pipeline is in a high-temperature and high-pressure gaseous refrigerant, and the refrigerant can directly participate in heating or increase the total amount of the refrigerant. Meanwhile, the oil return effect of the compressor can be improved through the heat exchange unit, and the reliability of the compressor can be improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a heat exchange unit, an air conditioning system, and an air conditioning device. Background Technology

[0002] In air conditioning systems, the actual amount of refrigerant added by users to the unit is usually less than the standard amount, about 70%-80% of the standard amount. At the same time, as the air conditioning system is used for longer, the unit will inevitably leak some refrigerant, resulting in an unavoidable loss of refrigerant in the air conditioning system.

[0003] When the amount of refrigerant in the air conditioning system is too low, the air conditioning unit will have insufficient heating or cooling capacity, resulting in a poor user experience.

[0004] After the refrigerant enters the gas-liquid separator, the gaseous refrigerant inside the gas-liquid separator will be output to the compressor through the outlet pipe of the gas-liquid separator, while the liquid refrigerant will remain in the internal cavity of the gas-liquid separator and will not be able to continue to participate in the refrigerant cycle, which will lead to a further reduction in the total amount of refrigerant used for heating or cooling in the unit.

[0005] There is a gas-liquid separator in the prior art that has an output pipeline for leading out liquid refrigerant. The liquid refrigerant is heated by an electric heating element and then reintroduced into the gas-liquid separator, thereby increasing the total amount of gaseous refrigerant output from the outlet pipe of the gas-liquid separator. However, it has the problems of high energy consumption and limited total amount of refrigerant replenished to the refrigerant circulation system. Utility Model Content

[0006] This application provides a heat exchange unit, an air conditioning system, and an air conditioning device to solve the technical problems in the prior art where the utilization of liquid refrigerant retained inside the gas-liquid separator results in high energy consumption and a limited total amount of refrigerant replenished to the refrigerant circulation system.

[0007] In a first aspect, this application provides a heat exchange unit, comprising:

[0008] A gas-liquid separator, which includes a liquid refrigerant outlet branch;

[0009] The heat exchanger is connected to the liquid refrigerant outlet branch and the oil circulation pipeline, respectively, and is used to realize the heat exchange between the refrigerant and the oil in the heat exchanger; the refrigerant outlet of the heat exchanger is connected to the refrigerant circulation pipeline through the replenishment pipeline.

[0010] A booster device is installed on the supplementary pipeline.

[0011] Optionally, a first throttling device is provided on the liquid refrigerant outlet branch.

[0012] Optionally, the gas-liquid separator also includes a cylinder and an outlet pipe. One end of the liquid refrigerant outlet branch extends into the cylinder, and the outlet pipe is used to output the gaseous refrigerant inside the cylinder. Inside the cylinder, the refrigerant inlet of the outlet pipe is higher than the refrigerant inlet of the liquid refrigerant outlet branch.

[0013] Optionally, the outlet pipe is provided with an oil return hole, and there is a preset height difference between the oil return hole and the refrigerant inlet of the liquid refrigerant outlet branch.

[0014] Optionally, a filter element is provided on the oil return hole.

[0015] Optionally, the booster device is a booster pump.

[0016] In a second aspect, this application provides an air conditioning system, including the heat exchange unit provided in the first aspect of this application, and further including a compressor, a refrigerant circulation pipeline and an oil circulation pipeline, wherein the compressor is connected to the refrigerant circulation pipeline and the oil circulation pipeline respectively;

[0017] The outlet pipe of the gas-liquid separator is connected to the suction port of the compressor, and the oil outlet of the heat exchanger is connected to the suction port of the compressor.

[0018] Optionally, the air conditioning system also includes an oil separator, which is connected to the compressor's exhaust port, the refrigerant outlet of the oil separator is connected to the refrigerant circulation pipeline, and the oil outlet of the oil separator is connected to the oil inlet of the heat exchange device.

[0019] Optionally, the oil circulation pipeline includes a first oil passage and a second oil passage. The first oil passage is connected between the oil outlet of the oil separator and the oil inlet of the heat exchange device, and the second oil passage is connected between the oil outlet of the heat exchange device and the suction port of the compressor. A second throttling element is provided on the second oil passage.

[0020] Optionally, the air conditioning system also includes a heat dissipation module through which the refrigerant circulation pipes flow.

[0021] Optionally, the refrigerant circulation pipeline includes a main circulation line, on which a compressor, a four-way valve, an indoor heat exchanger, a subcooler, and an outdoor heat exchanger are installed, with the subcooler connected between the indoor and outdoor heat exchangers.

[0022] Optionally, the refrigerant circulation pipeline also includes a first branch, which is equipped with a third throttling device, and the first branch flows through the cooler;

[0023] One end of the first branch is connected to the main circulation line between the indoor heat exchanger and the subcooler, and the other end of the first branch is connected to the inlet pipe of the gas-liquid separator.

[0024] Optionally, the refrigerant circulation pipeline also includes a second branch, on which a heat-conducting base is provided, and the outdoor heat exchanger is installed on the heat-conducting base;

[0025] One end of the second branch is connected to the compressor's exhaust port; the other end of the second branch is connected to the gas-liquid separator's inlet pipe.

[0026] Thirdly, this application provides an air conditioning device, including the air conditioning system provided in the second aspect of this application.

[0027] The technical solutions provided in this application have the following advantages compared with the prior art:

[0028] The heat exchange unit provided in this embodiment can output the liquid refrigerant retained inside the gas-liquid separator through a liquid refrigerant outlet branch to replenish the total refrigerant in the air conditioning system, thereby improving the heating or cooling capacity of the air conditioning system. The heat exchange device is connected to both the liquid refrigerant outlet branch and the oil circulation pipeline to facilitate heat exchange between the refrigerant and the oil. Since there is no need to heat the liquid refrigerant through electric heating components, the energy consumption generated when utilizing the liquid refrigerant retained inside the gas-liquid separator can be reduced. A pressurization device is installed on the replenishment pipeline to further pressurize the high-temperature refrigerant, ensuring that the refrigerant output from the replenishment pipeline is in a high-temperature, high-pressure gaseous state. When the air conditioning system is in heating mode, the high-temperature, high-pressure gaseous refrigerant can be directly delivered to the indoor heat exchanger for condensation and heat release, thereby improving the heating capacity of the air conditioning system. When the air conditioning system is in cooling mode, high-temperature, high-pressure gaseous refrigerant can be directly delivered to the outdoor heat exchanger or the compressor's suction port to increase the total amount of refrigerant in the refrigerant circulation pipeline, thereby improving the cooling capacity of the air conditioning system. Simultaneously, liquid refrigerant can be used to cool the high-temperature oil in the oil circulation pipeline, reducing the specific volume of the cooled oil. This results in a greater amount of oil returning to the compressor per unit time, improving the compressor's oil return efficiency and enhancing its reliability.

[0029] The air conditioning system and air conditioning equipment provided in this application include the above-mentioned heat exchange unit. The heat exchange unit can be used to replenish refrigerant and cool oil, and therefore naturally has the technical effects of the above-mentioned heat exchange unit. Attached Figure Description

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Figure 1 This is a connection diagram of an air conditioning system provided in an embodiment of this application;

[0034] Figure 2 A schematic diagram of the heat exchange unit provided in an embodiment of this application;

[0035] Figure 3 This is a partial cross-sectional view of a gas-liquid separator provided in an embodiment of this application;

[0036] Figure 4 A schematic diagram illustrating the separation of oil and refrigerant inside a gas-liquid separator provided in an embodiment of this application;

[0037] Figure 5 Provided for the embodiments of this application Figure 3 Enlarged detail of section A;

[0038] Figure 6 A schematic diagram of the heating mode of an air conditioning system provided in an embodiment of this application;

[0039] Figure 7 Provided for the embodiments of this application Figure 6 Magnification of local details Figure 1 ;

[0040] Figure 8 Provided for the embodiments of this application Figure 6 Magnification of local details Figure 2 ;

[0041] Figure 9 A schematic diagram of the cooling mode of an air conditioning system provided in an embodiment of this application;

[0042] Figure 10 Provided for the embodiments of this application Figure 9 A magnified view of a local detail.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Gas-liquid separator; 110. Liquid refrigerant outlet branch; 120. First throttling element; 130. Cylinder; 140. Outlet pipe; 141. Oil return hole; 142. Pressure equalization hole; 143. U-shaped pipe section; 150. Inlet pipe;

[0045] 2. Heat exchange device;

[0046] 3. Supplement the pipeline;

[0047] 4. Pressure boosting device;

[0048] 5. Compressor;

[0049] 6. Refrigerant circulation piping; 610. Main circulation line; 620. First branch line; 630. Third throttling element; 640. Second branch line;

[0050] 7. Oil circulation pipeline; 710. First oil circuit; 720. Second oil circuit; 730. Second throttling element; 740. First valve;

[0051] 8. Oil separator;

[0052] 9. Heat dissipation module;

[0053] 10. Four-way valve;

[0054] 11. Indoor heat exchanger;

[0055] 12. Subcooler;

[0056] 13. Outdoor heat exchanger;

[0057] 14. Heat-conducting base;

[0058] 15. Section Four: Flow Components;

[0059] 16. Filter;

[0060] 17. Second valve component;

[0061] 18. Third valve component;

[0062] 19. Section 5 Flow Components;

[0063] 20. Fourth valve component;

[0064] 21. Fifth valve component;

[0065] 22. Check valve. Detailed Implementation

[0066] 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.

[0067] 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.

[0068] 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.

[0069] To address the technical problems of high energy consumption and limited total refrigerant supply when utilizing the liquid refrigerant retained inside the gas-liquid separator 1 in existing technologies, this application provides a heat exchange unit, an air conditioning system, and air conditioning equipment. This heat exchange unit enables heat exchange between the liquid refrigerant output from the gas-liquid separator 1 and the oil circulation pipeline 7 of the compressor 5 via the heat exchange device 2. This eliminates the need for electric heating components to raise the temperature of the liquid refrigerant, thus reducing energy consumption when utilizing the liquid refrigerant retained inside the gas-liquid separator 1. A pressurization device 4 is provided on the replenishment pipeline 3, which further transforms the heat-exchanged refrigerant into a high-temperature, high-pressure refrigerant that can be directly input into the refrigerant circulation pipeline 6 for use, thereby increasing the total amount of refrigerant in the refrigerant circulation pipeline 6 and ultimately improving the heating or cooling capacity of the air conditioning system.

[0070] Please see Figure 1 and Figure 10 The first aspect of this application provides a heat exchange unit, including a gas-liquid separator 1, a heat exchange device 2, and a pressurization device 4. The gas-liquid separator 1 includes a liquid refrigerant outlet branch 110 for outputting the liquid refrigerant retained inside the gas-liquid separator 1, such as... Figure 1 , Figure 3 and Figure 4 As shown.

[0071] The heat exchanger 2 is connected to the liquid refrigerant outlet branch 110 and the oil circulation pipeline 7, respectively, to realize heat exchange between the refrigerant and the oil in the heat exchanger 2. This eliminates the need for heating the liquid refrigerant via electric heating components, reducing energy consumption when utilizing the liquid refrigerant stored inside the gas-liquid separator 1. Simultaneously, the liquid refrigerant can cool the high-temperature oil in the oil circulation pipeline 7, reducing the specific volume of the cooled oil. This results in a greater total amount of oil returning to the compressor 5 per unit time, improving the oil return efficiency of the compressor 5 and enhancing its reliability.

[0072] The refrigerant outlet of heat exchanger 2 is connected to refrigerant circulation pipe 6 via replenishment pipe 3, allowing the heated high-temperature refrigerant to be introduced into refrigerant circulation pipe 6. Figure 1 , Figure 6 and Figure 9 As shown.

[0073] The pressurization device 4 is installed on the replenishment pipe 3, which can further pressurize the high-temperature refrigerant, so that the refrigerant output from the replenishment pipe 3 is in a high-temperature, high-pressure gaseous state. When the air conditioning system is in heating mode, the high-temperature, high-pressure gaseous refrigerant can be directly delivered to the indoor heat exchanger 11 for condensation and heat release, thereby improving the heating capacity of the air conditioning system. When the air conditioning system is in cooling mode, the high-temperature, high-pressure gaseous refrigerant can be directly delivered to the outdoor heat exchanger 13 or the suction port of the compressor 5 to increase the total amount of refrigerant in the refrigerant circulation pipe 6, thereby improving the cooling capacity of the air conditioning system.

[0074] In some embodiments of this application, please refer to Figure 1 and Figure 2 A first throttling element 120 is installed on the liquid refrigerant outlet branch 110. This element can throttle, reduce pressure, lower temperature, and control the flow rate of the liquid refrigerant before it passes through the heat exchange device 2. After the liquid refrigerant output from the gas-liquid separator 1 is throttled, reduced in pressure, and lowered in temperature by the first throttling element 120, it can be converted into a more easily evaporating two-phase gas-liquid refrigerant. After heat exchange through the heat exchange device 2, it is easier for the refrigerant to evaporate into a gaseous refrigerant. In addition, the opening of the first throttling element 120 can be adjusted as needed to precisely control the flow rate of refrigerant entering the heat exchange device 2 and the replenishment pipeline 3 according to the system operating conditions, thereby achieving accurate control of the heating or cooling temperature.

[0075] In some preferred embodiments of this application, the first throttling element 120 is an electronic expansion valve, which can quickly respond to system changes and achieve precise control of refrigerant flow, which is beneficial to improving the stability of the heat exchange unit and the air conditioning system.

[0076] In some embodiments of this application, please refer to Figure 2 , Figure 3 and Figure 4 The gas-liquid separator 1 also includes a cylinder 130 and an outlet pipe 140. One end of the liquid refrigerant outlet branch 110 extends into the cylinder 130 and is used to output the liquid refrigerant stored inside the cylinder 130. The outlet pipe 140 is used to output the gaseous refrigerant inside the cylinder 130, so that the gaseous refrigerant enters the suction port of the compressor 5 through the refrigerant circulation pipeline 6 to complete the normal refrigerant circulation. Inside the cylinder 130, the refrigerant inlet of the outlet pipe 140 is higher than the refrigerant inlet of the liquid refrigerant outlet branch 110. This is because after the gas-liquid two-phase refrigerant enters the cylinder 130 through the inlet pipe 150 of the gas-liquid separator 1, it will have different inertial effects due to the different densities of the vapor and liquid particles. This causes the liquid particles carried in the refrigerant to fall back down along the inner wall of the cylinder 130 of the gas-liquid separator 1 to the bottom of the gas-liquid separator 1, while the gaseous refrigerant is located at the top of the cylinder 130. Therefore, the gaseous refrigerant can enter the suction line of the compressor 5 through the outlet pipe 140 with the higher refrigerant inlet for normal refrigerant circulation, while the liquid refrigerant can be transported to the heat exchange device 2 and the replenishment line 3 through the liquid refrigerant outlet branch 110 with the lower refrigerant inlet for refrigerant replenishment.

[0077] When compressor 5 is in the intake and compression phase, lubricating oil is drawn into the compressor 5 along with refrigerant vapor to lubricate and cool the internal components of compressor 5, ensuring stable operation of compressor 5. Although an oil separator 8 is installed on the exhaust pipe of compressor 5 to separate refrigerant and lubricating oil, some lubricating oil will still enter the refrigerant circulation pipe 6 with the refrigerant and flow back to the gas-liquid separator 1. If this part of lubricating oil remains inside the cylinder 130 of the gas-liquid separator 1, it will cause compressor 5 to be short of oil, which may lead to an increase in compressor 5 temperature and abnormal operation.

[0078] To solve the above problems, in some embodiments of this application, an oil return hole 141 is provided on the outlet pipe 140. When the suction port of the compressor 5 is connected to the outlet pipe 140, the gaseous working fluid flows at high speed through the outlet pipe 140 into the compressor 5, which will cause the pressure inside the oil return hole 141 (i.e. the inside side of the outlet pipe 140) to be less than the pressure outside the outlet pipe 140 (i.e. the outside side of the outlet pipe 140). The lubricating oil stored inside the cylinder 130 can be drawn into the outlet pipe 140 through the oil return hole 141 and drawn into the compressor 5 along with the gaseous refrigerant, thus avoiding the compressor 5 from running out of oil.

[0079] It should be noted that, due to the different densities of liquid lubricating oil and liquid refrigerant, the liquid refrigerant and liquid lubricating oil inside the cylinder 130 will separate into layers, such as... Figure 4As shown. When the density of the liquid lubricating oil is greater than that of the liquid refrigerant, the liquid lubricating oil is located below the liquid refrigerant; while when the density of the liquid lubricating oil is less than that of the liquid refrigerant, the liquid lubricating oil is located above the liquid refrigerant.

[0080] In some embodiments of this application, please refer to Figure 3 and Figure 4 A preset height difference H exists between the oil return hole 141 and the refrigerant inlet of the liquid refrigerant outlet branch 110, allowing for the output of liquid lubricating oil and liquid refrigerant located at different heights within the cylinder 130. Specifically, when the density of the liquid lubricating oil is greater than that of the liquid refrigerant, the refrigerant inlet of the liquid refrigerant outlet branch 110 is higher than the oil return hole 141; when the density of the liquid lubricating oil is less than that of the liquid refrigerant, the refrigerant inlet of the liquid refrigerant outlet branch 110 is lower than the oil return hole 141. This prevents liquid refrigerant from flowing out through the oil return hole 141 to the suction port of the compressor 5, causing liquid slugging and damage to the compressor 5; and prevents lubricating oil from flowing out through the liquid refrigerant outlet branch 110, which could lead to oil shortage in the compressor 5.

[0081] As a specific embodiment of this application, please refer to Figure 3 and Figure 4 The density of the liquid lubricating oil is greater than that of the liquid refrigerant. At this time, the liquid refrigerant is located above the liquid lubricating oil. The oil return hole 141 is preferably located at the bottom of the U-shaped pipe section 143 of the outlet pipe 140. The refrigerant inlet of the liquid refrigerant outlet branch 110 is higher than the oil return hole 141. The liquid refrigerant can be output to the heat exchange device 2 through the liquid refrigerant outlet branch 110. The lubricating oil at the bottom of the cylinder 130 enters the outlet pipe 140 through the oil return hole 141 and is sucked into the interior of the compressor 5 along with the gaseous refrigerant, ensuring the reliable operation of the compressor 5.

[0082] In some embodiments of this application, please refer to Figure 3 The oil return hole 141 is equipped with a filter element, which can prevent impurities deposited inside the cylinder 130 from entering the outlet pipe 140 through the oil return hole 141, thereby preventing impurities from entering the interior of the compressor 5 and causing damage to the internal components of the compressor 5.

[0083] In some embodiments of this application, please refer to Figure 3 and Figure 5 The U-shaped pipe section 143 of the outlet pipe 140 is located inside the cylinder 130. A pressure equalization hole 142 is provided at the top of the U-shaped pipe section 143 to balance the pressure inside the outlet pipe 140 and the cylinder 130, eliminating the pressure difference between them and preventing a large amount of liquid refrigerant from flowing into the compressor 5 through the U-shaped pipe section 143, which could cause liquid slugging and damage to the compressor 5. Specifically, the pressure equalization hole 142 is located at the end of the U-shaped pipe section 143 furthest from the refrigerant inlet of the outlet pipe 140.

[0084] In the above embodiments, the heat exchange device 2 can be a shell-and-tube heat exchanger, a coaxial heat exchanger, or other heat exchange devices. The refrigerant and oil flow in opposite directions inside the heat exchange device 2, which can realize countercurrent heat exchange between the liquid refrigerant and the high-temperature oil, improve the heat exchange effect, and finally output high-temperature gaseous refrigerant and low-temperature lubricating oil from the heat exchange device 2.

[0085] In the above embodiments, the pressurization device 4 can use components with low energy consumption such as a pressurization pump, pressurization valve, and pressurization tank, or it can use a non-powered pressurization device in the prior art. Compared with the prior art method of heating the liquid refrigerant in the gas-liquid separator 1 through an electric heating component and then sending it back to the gas-liquid separator 1, this application realizes the heating and pressurization of the liquid refrigerant in sequence through the heat exchange device 2 and the pressurization device 4. This can not only directly generate high-temperature and high-pressure gaseous refrigerant and transmit it to the refrigerant circulation pipeline 6, but also significantly reduce the energy consumption generated when utilizing the liquid refrigerant retained inside the gas-liquid separator 1.

[0086] Please refer to some preferred embodiments of this application. Figure 1 and Figure 2 The booster device 4 is a booster pump, which can not only further pressurize the high-temperature refrigerant after heat exchange into a high-temperature and high-pressure gaseous refrigerant, but also provide power for the flow of refrigerant in the replenishment pipeline 3, eliminating the need to install additional power components such as circulation pumps in the replenishment pipeline 3.

[0087] Through the aforementioned heat exchange unit, the liquid refrigerant inside the cylinder 130 of the gas-liquid separator 1 can be led out through the liquid refrigerant lead-out branch 110. After exchanging heat with the oil in the oil circulation pipeline 7 in the heat exchange device 2, it enters the refrigerant circulation pipeline 6 under the action of the pressurization device 4 to replenish the refrigerant, which can be used to improve the heating or cooling capacity of the air conditioning system. At the same time, the oil (i.e., lubricating oil) in the oil circulation pipeline 7 will have a lower oil temperature and a smaller specific volume after heat exchange upon returning to the compressor 5. This results in more lubricating oil returning to the compressor 5 per unit time, improving the oil return effect of the compressor 5 and enhancing its reliability.

[0088] Please see Figures 1 to 10 The second aspect of this application provides an air conditioning system, including the heat exchange unit described in the above embodiments, and further including a compressor 5, a refrigerant circulation pipeline 6, and an oil circulation pipeline 7. The compressor 5 is connected to the refrigerant circulation pipeline 6 and the oil circulation pipeline 7, respectively, allowing gaseous refrigerant and lubricating oil to enter the interior of the compressor 5 from the suction port, thereby compressing the gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant; while the lubricating oil can flow through the interior of the compressor 5 with the refrigerant during the intake and compression process, achieving efficient lubrication and cooling of various components inside the compressor 5, such as... Figure 1 As shown.

[0089] The outlet pipe 140 of the gas-liquid separator 1 is connected to the suction port of the compressor 5, allowing the gaseous refrigerant and lubricating oil inside the gas-liquid separator 1 to be input into the compressor 5, thereby achieving normal refrigerant circulation and oil replenishment. The oil outlet of the heat exchange device 2 is connected to the suction port of the compressor 5, allowing the low-temperature oil after heat exchange to be drawn into the compressor 5, increasing the total amount of lubricating oil returning to the compressor 5 per unit time, thus providing more efficient lubrication and cooling for the compressor 5.

[0090] In some embodiments of this application, please refer to Figure 1 The air conditioning system also includes an oil separator 8, which is connected to the exhaust port of the compressor 5. It can separate the lubricating oil from the high-temperature and high-pressure gas (including refrigerant and lubricating oil) discharged by the compressor 5, so as to return it to the compressor 5 and ensure the recycling of the lubricating oil.

[0091] The refrigerant outlet of the oil separator 8 is connected to the refrigerant circulation pipeline 6, which allows the high-temperature and high-pressure gaseous refrigerant separated from the lubricating oil to enter the refrigerant circulation pipeline 6 to achieve normal refrigerant circulation.

[0092] The oil outlet of the oil separator 8 is connected to the oil inlet of the heat exchange device 2, so that the high-temperature oil can be cooled by heat exchange through the heat exchange device 2 before returning to the compressor 5, which helps to improve the cooling effect of the lubricating oil.

[0093] In some embodiments of this application, please refer to Figure 6 , Figure 8 and Figure 9 A one-way valve 22 is installed at the refrigerant outlet of the oil separator 8, which can realize the one-way flow of high-temperature and high-pressure gaseous refrigerant and ensure the stability of the air conditioning system.

[0094] In some embodiments of this application, please refer to Figure 2 The oil circulation pipeline 7 includes a first oil passage 710 and a second oil passage 720. The first oil passage 710 is connected between the oil outlet of the oil separator 8 and the oil inlet of the heat exchange device 2, and can be used to input the high-temperature lubricating oil separated in the oil separator 8 into the heat exchange device 2 through the first oil passage 710 so as to exchange heat with the liquid refrigerant drawn from the gas-liquid separator 1. The second oil passage 720 is connected between the oil outlet of the heat exchange device 2 and the suction port of the compressor 5, and can return the low-temperature lubricating oil after heat exchange to the compressor 5 to realize the recycling of lubricating oil.

[0095] The second oil passage 720 is equipped with a second throttling element 730, which can further throttle and cool the lubricating oil after heat exchange, further reduce the specific volume of the lubricating oil, increase the amount of oil returning to the compressor 5 per unit time, and improve the lubrication and cooling effect of the lubricating oil on the compressor 5.

[0096] It should be noted that the second throttling element 730 can be an electronic expansion valve or a capillary tube, both of which can play a throttling and cooling role and can achieve the purpose of this application.

[0097] In some embodiments of this application, please refer to Figure 2 When the second throttling element 730 is a capillary tube, the second oil circuit 720 is also equipped with a first valve 740, which can be used to realize the on / off control of the second oil circuit 720.

[0098] In some embodiments of this application, please refer to Figure 1 , Figure 6 and Figure 9 The air conditioning system also includes a heat dissipation module 9. The refrigerant circulation pipe 6 flows through the heat dissipation module 9, which can be used to dissipate heat and cool down the heat-generating components in the air conditioning system, thereby ensuring the normal operation of components such as the compressor 5 and the fan in the air conditioning system.

[0099] In some embodiments of this application, the heat dissipation module 9 includes a radiator, a compressor IPM (intelligent power module), and a fan IPM. The compressor IPM integrates multiple protection circuits, such as overcurrent protection and overheat protection, to ensure the safe operation of the compressor 5 under abnormal conditions. The fan IPM is mainly used to control the motor drive of the fan, achieving precise control of airflow by adjusting the motor speed and power. Since both the compressor IPM and the fan IPM generate a large amount of heat during operation, they need to be mounted close to the radiator for heat dissipation. In addition, by passing a portion of the refrigerant circulation pipeline 6 through the radiator, the refrigerant can absorb the heat generated by the compressor IPM and fan IPM during operation, and the heat can be dissipated through the radiator, achieving efficient heat dissipation of the intelligent power module.

[0100] In some embodiments of this application, please refer to Figure 1 , Figure 6 and Figure 9 The refrigerant circulation pipeline 6 includes a main circulation pipeline 610, which is equipped with a compressor 5, a four-way valve 10, an indoor heat exchanger 11, a subcooler 12 and an outdoor heat exchanger 13. It can be used to realize the normal circulation of refrigerant, thereby realizing the heating mode, cooling mode and other working modes of the air conditioning system.

[0101] The subcooler 12 is connected between the indoor heat exchanger 11 and the outdoor heat exchanger 13. A fourth throttling element 15 is also provided between the subcooler 12 and the outdoor heat exchanger 13, and the fourth throttling element 15 is preferably an electronic expansion valve. In heating mode, the indoor heat exchanger 11 acts as a condenser, and the outdoor heat exchanger 13 acts as an evaporator. The refrigerant condenses and releases heat in the indoor heat exchanger 11. The high-temperature, high-pressure liquid refrigerant flowing out of the indoor heat exchanger 11 flows into the subcooler 12. The subcooler 12 further cools the refrigerant, maintaining a lower temperature and higher pressure before it enters the fourth throttling element 15. This allows for a lower evaporation temperature after throttling by the fourth throttling element 15, enabling the refrigerant to absorb more heat in the outdoor heat exchanger 13. Figure 6 As shown.

[0102] In cooling mode, the outdoor heat exchanger 13 acts as a condenser, and the indoor heat exchanger 11 acts as an evaporator. The refrigerant condenses and releases heat in the outdoor heat exchanger 13, then undergoes throttling, pressure reduction, and temperature reduction via the fourth throttling element 15, and is further cooled by the subcooler 12. This increases the subcooling degree of the refrigerant, allowing it to absorb more heat in the indoor heat exchanger 11, thereby increasing the system's cooling capacity, reducing throttling losses, and improving the coefficient of performance (COP). Figure 9 As shown.

[0103] In some embodiments of this application, please refer to Figure 1 , Figure 6 and Figure 9 The four-way valve 10 has a first connection port, a second connection port, a third connection port and a fourth connection port. The first connection port is connected to the exhaust port of the compressor 5, the second connection port is connected to the indoor heat exchanger 11, the third connection port is connected to the inlet pipe 150 of the gas-liquid separator 1, and the fourth connection port is connected to the outdoor heat exchanger 13. The flow direction of the refrigerant can be controlled through the four-way valve 10, thereby realizing the switching of the working mode of the air conditioning system.

[0104] In heating mode, the first and second connecting ports are connected, and the third and fourth connecting ports are connected. The compressor 5 discharges a high-temperature, high-pressure gaseous airflow, which passes through the oil separator 8 to separate the high-temperature, high-pressure gaseous refrigerant from the high-temperature lubricating oil. The high-temperature, high-pressure gaseous refrigerant flows through the four-way valve 10 to the indoor heat exchanger 11. Simultaneously, the high-temperature, high-pressure gaseous refrigerant flowing from the supplementary pipe 3 also collects in the main circulation path 610 and flows into the indoor heat exchanger 11 for condensation and heat release, thereby enhancing the heating effect. The heating capacity of the unit is as follows: High-temperature, high-pressure gaseous refrigerant undergoes condensation and heat exchange in the indoor heat exchanger 11, becoming a high-temperature, high-pressure liquid working fluid. It then enters the subcooler 12 for further cooling, and then passes through the fourth throttling element 15 for pressure and temperature reduction, becoming a low-temperature, low-pressure liquid refrigerant. This liquid refrigerant then enters the outdoor heat exchanger 13 for evaporation and heat absorption, becoming a low-temperature, low-pressure saturated vapor or containing a small amount of liquid refrigerant. It then enters the cylinder 130 of the gas-liquid separator 1 through the inlet pipe 150. The gaseous refrigerant in the gas-liquid separator 1 returns to the suction port of the compressor 5 through the outlet pipe 140 for the next cycle, while the liquid refrigerant in the gas-liquid separator 1 is heated and pressurized by the heat exchange unit and returns to the main circulation path 610, thus improving the heating capacity.

[0105] In cooling mode, the first and fourth connecting ports are connected, and the second and third connecting ports are connected. The compressor 5 discharges a high-temperature and high-pressure gaseous airflow, which is separated from the high-temperature and high-pressure gaseous refrigerant by the oil separator 8. The high-temperature and high-pressure gaseous refrigerant flows to the outdoor heat exchanger 13 through the four-way valve 10 for condensation and heat release, becoming a high-temperature and high-pressure liquid working fluid. It then enters the fourth throttling device 15 for throttling, pressure reduction, and temperature reduction, and then enters the subcooler 12 for further cooling, increasing the subcooling degree of the refrigerant, becoming a low-temperature and low-pressure liquid or gas-liquid mixed refrigerant. It then enters the indoor heat exchanger 11 for evaporation and heat absorption, becoming a low-temperature and low-pressure saturated vapor state or containing a small amount of liquid refrigerant. Finally, it enters the cylinder 130 of the gas-liquid separator 1 through the inlet pipe 150. The gaseous refrigerant in the gas-liquid separator 1 returns to the suction port of the compressor 5 through the outlet pipe 140 for the next cycle, while the liquid refrigerant in the gas-liquid separator 1 is heated and pressurized by the heat exchange unit and returns to the interior of the gas-liquid separator 1 through the main circulation path 610. This can increase the amount of gaseous refrigerant output from the gas-liquid separator 1, thereby improving the cooling capacity of the air conditioning system.

[0106] In some embodiments of this application, please refer to Figure 1 , Figure 6 and Figure 9 The heat dissipation module 9 is located on the main circulation path 610 between the subcooler 12 and the fourth throttling element 15. Whether in heating mode or cooling mode, the refrigerant flowing through the heat dissipation module 9 is a low-temperature refrigerant, which can provide a good cooling effect for the power components in the heat dissipation module 9.

[0107] In some embodiments of this application, please refer to Figure 6 , Figure 8 and Figure 9 A filter 16 is installed on the refrigerant circulation pipe 6 to filter impurities in the refrigerant circulation pipe 6 and prevent impurities in the refrigerant from clogging the throttling components in the air conditioning system.

[0108] In some embodiments of this application, please refer to Figure 1 , Figure 6 , Figure 7 , Figure 9 and Figure 10 The refrigerant circulation pipeline 6 also includes a first branch 620, which is equipped with a third throttling element 630. The first branch 620 flows through the subcooler 12. Since the third throttling element 630 can throttle and reduce the temperature of the refrigerant in the first branch 620, the temperature of the refrigerant in the first branch 620 inside the subcooler 12 is lower than the temperature of the refrigerant in the main circulation pipeline 610. This can be used to achieve heat exchange between the refrigerant in the first branch 620 and the main circulation pipeline 610 in the subcooler 12, thereby reducing the temperature of the refrigerant in the main circulation pipeline 610.

[0109] One end of the first branch 620 is connected to the main circulation 610 between the indoor heat exchanger 11 and the subcooler 12, which allows some refrigerant to be diverted from the main circulation 610 to the first branch 620. The other end of the first branch 620 is connected to the inlet pipe 150 of the gas-liquid separator 1, which allows the refrigerant in the first branch 620 to return to the main circulation 610 through the gas-liquid separator 1.

[0110] In some embodiments of this application, please refer to Figure 6 and Figure 7 When the air conditioning system is in heating mode, the refrigerant in the main circulation circuit 610 flows from the indoor heat exchanger 11 to the subcooler 12. Part of the refrigerant enters the subcooler 12 through the main circulation circuit 610, and the other part of the refrigerant is diverted to the first branch circuit 620. The third throttling device 630 throttles and cools the refrigerant in the first branch circuit 620. Inside the subcooler 12, the refrigerant in the main circulation circuit 610 can be cooled by heat exchange through the refrigerant in the first branch circuit 620, thereby increasing the subcooling degree of the refrigerant in the main circulation circuit 610.

[0111] In other embodiments of this application, please refer to Figure 9 and Figure 10When the air conditioning system is in cooling mode, after the refrigerant in the main circulation circuit 610 passes through the subcooler 12, a portion of the refrigerant will flow back through the first branch circuit 620. The refrigerant that flows back will be throttled and cooled by the third throttling device 630. It can still exchange heat with the refrigerant that subsequently passes through the main circulation circuit 610 in the subcooler 12, thereby cooling the refrigerant in the main circulation circuit 610 and increasing the subcooling degree of the refrigerant in the main circulation circuit 610.

[0112] In some embodiments of this application, please refer to Figure 6 and Figure 9 The first branch 620 is equipped with a second valve 17, which can control the flow of refrigerant in the first branch 620 by switching it on and off, thereby adjusting the subcooling effect of the subcooler 12.

[0113] In some embodiments of this application, please refer to Figure 1 , Figure 6 and Figure 8 The refrigerant circulation pipeline 6 also includes a second branch 640, on which a heat-conducting base 14 is provided. The outdoor heat exchanger 13 is mounted on the heat-conducting base 14 and can transfer heat to the outdoor heat exchanger 13 through the heat-conducting base 14, thereby realizing the defrosting operation of the outdoor heat exchanger 13.

[0114] One end of the second branch 640 is connected to the exhaust port of the compressor 5. High-temperature and high-pressure gaseous working fluid can be input into the second branch 640 through the compressor 5 to raise the temperature of the heat-conducting base 14 and melt the frost on the outdoor heat exchanger 13. The other end of the second branch 640 is connected to the inlet pipe 150 of the gas-liquid separator 1. This part of the refrigerant can be returned to the refrigerant circulation pipeline 6 for recycling through the gas-liquid separator 1.

[0115] In some embodiments of this application, please refer to Figure 6 , Figure 8 and Figure 9 The second branch 640 is equipped with a third valve 18 and a fifth throttling device 19. The third valve 18 can control the refrigerant flow and on / off state of the second branch 640, thereby adjusting the defrosting effect. The fifth throttling device 19 can throttle and reduce the pressure of the refrigerant before it returns to the gas-liquid separator 1, avoiding excessive pressure inside the cylinder 130, which would cause fluctuations and oscillations in the gas-liquid separator 1 and hinder the stable operation of the gas-liquid separator 1 and the heat exchange unit.

[0116] In some other embodiments of this application, when the pressure in the compressor 5 is too high, the second branch 640 can also be used as a pressure relief branch to reduce the internal pressure of the compressor 5 and avoid compressor 5 failure and increased energy consumption.

[0117] In some embodiments of this application, a fourth valve 20 and a fifth valve 21 are provided on the main circulation path 610 on both sides of the indoor heat exchanger 11, which can be used to realize the on / off control of the main circulation path 610, so as to facilitate the inspection and maintenance of the indoor heat exchanger 11.

[0118] In the above embodiments of this application, each throttling element can be selected as an electronic expansion valve or a capillary tube as needed, and each valve can be set as a solenoid valve, electric valve or manual valve as needed, all of which can achieve the purpose of this application.

[0119] Please see Figures 1 to 10 The third aspect of this application provides an air conditioning device, including the air conditioning system described in the above embodiments. This air conditioning system can improve the problem of poor heating or cooling performance caused by insufficient circulating refrigerant, thereby enhancing the heating and cooling capacity of the air conditioning device and preventing a poor user experience. Simultaneously, it can improve the oil return effect of the compressor 5, which is beneficial for ensuring the normal operation of the air conditioning system and the air conditioning device, and thus improving the reliability of the air conditioning device.

[0120] In some embodiments of this application, when the air conditioning system is in heating mode, the temperature regulation method of the air conditioning system is as follows:

[0121] Step 1: Monitor the difference between the set target air outlet temperature T and the actual air outlet temperature t. If the actual air outlet temperature is lower than the set target air outlet temperature, it indicates that the air conditioning system has insufficient heating capacity. Control the first valve 740 and the pressurization device 4 to open.

[0122] Step Two: Adjust the opening of the first throttling element 120 according to the difference Tt. The opening of the first throttling element 120 is directly proportional to the difference Tt; that is, the larger the difference Tt, the lower the actual outlet air temperature t, and the worse the heating effect. In this case, the opening of the first throttling element 120 needs to be increased to increase the amount of refrigerant entering the main circulation circuit 610 through the supplementary pipe 3, thereby improving the heating capacity of the air conditioning system. However, the first throttling element 120 should not be fully opened to avoid losing its throttling, pressure-reducing, and temperature-reducing effects.

[0123] 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.

[0124] 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.

[0125] 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 exchange unit, characterized in that, include: A gas-liquid separator (1), the gas-liquid separator (1) including a liquid refrigerant outlet branch (110); A heat exchange device (2) is connected to the liquid refrigerant outlet branch (110) and the oil circulation pipeline (7) respectively, and is used to realize the heat exchange between the refrigerant and the oil in the heat exchange device (2); the refrigerant outlet of the heat exchange device (2) is connected to the refrigerant circulation pipeline (6) through the supplementary pipeline (3); A booster device (4) is installed on the supplementary pipeline (3).

2. The heat exchange unit according to claim 1, characterized in that, The liquid refrigerant outlet branch (110) is provided with a first throttling device (120).

3. The heat exchange unit according to claim 1 or 2, characterized in that, The gas-liquid separator (1) further includes a cylinder (130) and an outlet pipe (140). One end of the liquid refrigerant outlet branch (110) extends into the cylinder (130), and the outlet pipe (140) is used to output the gaseous refrigerant inside the cylinder (130). Inside the cylinder (130), the refrigerant inlet of the outlet pipe (140) is higher than the refrigerant inlet of the liquid refrigerant outlet branch (110).

4. The heat exchange unit according to claim 3, characterized in that, The outlet pipe (140) is provided with an oil return hole (141), and there is a preset height difference between the oil return hole (141) and the refrigerant inlet of the liquid refrigerant outlet branch (110).

5. The heat exchange unit according to claim 4, characterized in that, The oil return hole (141) is equipped with a filter element.

6. The heat exchange unit according to claim 1 or 2, characterized in that, The booster device (4) is a booster pump.

7. An air conditioning system, characterized in that, The device includes a heat exchange unit as described in any one of claims 1 to 6, and further includes a compressor (5), a refrigerant circulation pipeline (6) and an oil circulation pipeline (7), wherein the compressor (5) is connected to the refrigerant circulation pipeline (6) and the oil circulation pipeline (7) respectively; The outlet pipe (140) of the gas-liquid separator (1) is connected to the suction port of the compressor (5), and the oil outlet of the heat exchange device (2) is connected to the suction port of the compressor (5).

8. The air conditioning system according to claim 7, characterized in that, It also includes an oil separator (8), which is connected to the exhaust port of the compressor (5), the refrigerant outlet of the oil separator (8) is connected to the refrigerant circulation pipeline (6), and the oil outlet of the oil separator (8) is connected to the oil inlet of the heat exchange device (2).

9. The air conditioning system according to claim 8, characterized in that, The oil circulation pipeline (7) includes a first oil passage (710) and a second oil passage (720). The first oil passage (710) is connected between the oil outlet of the oil separator (8) and the oil inlet of the heat exchange device (2). The second oil passage (720) is connected between the oil outlet of the heat exchange device (2) and the suction port of the compressor (5). A second throttling element (730) is provided on the second oil passage (720).

10. The air conditioning system according to any one of claims 7 to 9, characterized in that, It also includes a heat dissipation module (9), through which the refrigerant circulation pipe (6) flows.

11. The air conditioning system according to any one of claims 7 to 9, characterized in that, The refrigerant circulation pipeline (6) includes a main circulation pipeline (610), on which the compressor (5), a four-way valve (10), an indoor heat exchanger (11), a subcooler (12) and an outdoor heat exchanger (13) are provided. The subcooler (12) is connected between the indoor heat exchanger (11) and the outdoor heat exchanger (13).

12. The air conditioning system according to claim 11, characterized in that, The refrigerant circulation pipeline (6) also includes a first branch (620), on which a third throttling element (630) is provided, and the first branch (620) flows through the subcooler (12); One end of the first branch (620) is connected to the main circulation path (610) between the indoor heat exchanger (11) and the subcooler (12), and the other end of the first branch (620) is connected to the inlet pipe (150) of the gas-liquid separator (1).

13. The air conditioning system according to claim 11, characterized in that, The refrigerant circulation pipeline (6) also includes a second branch (640), on which a heat-conducting base (14) is provided, and the outdoor heat exchanger (13) is disposed on the heat-conducting base (14); One end of the second branch (640) is connected to the exhaust port of the compressor (5); the other end of the second branch (640) is connected to the inlet pipe (150) of the gas-liquid separator (1).

14. An air conditioning device, characterized in that, Including the air conditioning system as described in any one of claims 7 to 13.

Images