An air conditioning system and an air conditioner

Abstract

This invention provides an air conditioning system and an air conditioner. The air conditioning system includes a compressor, a first heat exchanger, an intercooler, and a second heat exchanger connected to form a refrigerant circulation loop. The intercooler has a liquid outlet for drawing out liquid refrigerant after gas-liquid separation. A first throttling device is provided in the flow path between the intercooler and the first heat exchanger, and / or a second throttling device is provided in the flow path between the intercooler and the second heat exchanger. The compressor has a gas inlet, and the liquid outlet is connected to the gas inlet through a heating channel for heating the refrigerant flowing through it. According to this invention, the liquid refrigerant at the bottom of the intercooler in the air conditioning system can also participate in gas replenishment.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, specifically relating to an air conditioning system and an air conditioner. Background Technology

[0002] Air source heat pumps are a renewable energy source and represent the most efficient way to convert electricity into heat. Due to their energy-saving, environmentally friendly, and safe operation, they have been widely used for heating in northern regions in recent years. Air source heat pump units absorb heat from the air, which is then compressed by a compressor and converted into high-temperature heat energy for heat exchange. Because they are commonly used in low-temperature heating areas in the north, there are certain requirements for low-temperature heating capacity. To ensure this capacity, most systems employ two-stage compressor enthalpy-increasing technology, using an intercooler such as a flash evaporator to perform intermediate gas injection, increasing the amount of gas injected into the compressor and thus enhancing the low-temperature heating capacity.

[0003] Currently, when using intercoolers such as flash evaporators for gas replenishment, only the gaseous refrigerant at the top of the intercooler can be added to the compression unit, and there are no other gas replenishment methods available. This results in a relatively limited range of gas replenishment options, and therefore, this problem needs to be addressed. Utility Model Content

[0004] Therefore, this utility model provides an air conditioning system and an air conditioner that can solve the technical problem that in the prior art, air conditioning systems generally use gaseous refrigerant in the upper part of the intercooler for gas replenishment, without any other alternative gas replenishment methods, resulting in a relatively simple gas replenishment method.

[0005] To address the aforementioned problems, this utility model provides an air conditioning system comprising a compressor, a first heat exchanger, an intercooler, and a second heat exchanger connected to form a refrigerant circulation loop; the intercooler is provided with a liquid outlet for drawing out liquid refrigerant after internal gas-liquid separation; wherein a first throttling device is provided in the flow path between the intercooler and the first heat exchanger, and / or a second throttling device is provided in the flow path between the intercooler and the second heat exchanger; The compression device has a gas inlet, and the liquid outlet is connected to the gas inlet through a heating channel, which is used to heat the refrigerant flowing through it.

[0006] In some embodiments, the air conditioning system includes a third heat exchanger having a heat exchange channel serving as the heating channel, the heat exchange channel being capable of exchanging heat with the exhaust pipe of the compressor.

[0007] In some embodiments, the third heat exchanger is a shell-and-tube heat exchanger, which contacts the exhaust pipe of the compression device through the outer wall of the shell and tube, so that the heat exchange channel can exchange heat with the exhaust pipe of the compression device.

[0008] In some embodiments, the heating channel is equipped with a heater, through which the heating channel heats the refrigerant flowing through it.

[0009] In some embodiments, the intercooler further has a gas outlet for drawing out the gaseous refrigerant after internal gas-liquid separation; wherein the gas outlet is connected to the gas replenishment port.

[0010] In some embodiments, the liquid outlet pipeline and the gas outlet pipeline are both connected to the gas supply port via a connecting pipeline; wherein, The heating channel is located on the pipeline at the liquid outlet; or, the heating channel is located on the main pipeline.

[0011] In some embodiments, a first control valve is provided on the collection line; and / or, a second control valve is provided on the liquid outlet line.

[0012] In some embodiments, the compression device has a first compression chamber, an intermediate chamber, and a second compression chamber, wherein the exhaust port of the first compression chamber is connected to the intake port of the second compression chamber through the intermediate chamber; wherein the air supply port is disposed in the intermediate chamber.

[0013] In some embodiments, the compression device includes a high-pressure cylinder and a low-pressure cylinder, wherein the compression chamber inside the low-pressure cylinder forms the first compression chamber, the compression chamber inside the high-pressure cylinder forms the second compression chamber, and the exhaust port of the low-pressure cylinder is connected to the intake port of the high-pressure cylinder through a connecting channel; wherein the connecting channel forms the intermediate cavity.

[0014] In some implementations, the intercooler is a flash evaporator or an economizer.

[0015] This utility model also provides an air conditioner, which includes the air conditioning system described in any one of the above descriptions.

[0016] The air conditioning system and air conditioner provided by this utility model have the following beneficial effects: 1. This invention introduces liquid refrigerant from the bottom of the intercooler into the gas injection port of the compressor unit via a heating channel. The heating channel heats the liquid refrigerant flowing through it into a gaseous state, allowing the liquid refrigerant at the bottom of the intercooler to participate in gas injection. Compared to existing technologies that use gaseous refrigerant from the upper part of the intercooler for gas injection, this invention utilizes liquid refrigerant from the bottom of the intercooler, thus enriching the types of gas injection available in existing technologies and providing users with more options for gas injection.

[0017] 2. The intercooler of this utility model, on the one hand, replenishes the gaseous refrigerant after gas-liquid separation into the compression device through the gas outlet, and on the other hand, the intercooler also draws out the liquid refrigerant after gas-liquid separation into the compression device through the liquid outlet, heats it into gaseous refrigerant, and replenishes it into the compression device. The two work together to realize multi-channel gas replenishment to the compression device, increase the gas replenishment of the compression device, increase the refrigerant circulation on the high-pressure side, and improve the low-temperature heating capacity of the air conditioning system.

[0018] 3. This utility model, by setting a heating channel on the pipe at the liquid outlet of the intercooler, or on the combined pipe of the liquid outlet and gas outlet of the intercooler, can make the refrigerant liquid evaporate into gas, avoid the compressor device from sucking in gas while carrying liquid, reduce the exhaust temperature of the compressor device, and improve the reliability of the system. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the first example of the air conditioning system of this utility model; Figure 2 This is a schematic diagram of the structure of a second example of the air conditioning system of this utility model; Figure 3 This is a schematic diagram of another example of the air conditioning system of this utility model; Figure 4 This is a schematic diagram of another example of the air conditioning system of this utility model.

[0021] The attached figures are labeled as follows: 1. First heat exchanger; 2. Gas-liquid separator; 3. Four-way valve; 4. Compression unit; 4a. High-pressure cylinder; 4b. Low-pressure cylinder; 5. Second heat exchanger; 61. First throttling device; 62. Second throttling device; 7. Intercooler; 9. Second control valve; 10. First control valve; 11. Third heat exchanger; 12. Heating channel; 13. Main pipeline; 14. Heater; 40. Intermediate chamber; 41. First compression chamber; 42. Second compression chamber; 43. Connecting channel; 44. Gas inlet; 71. First refrigerant inlet / outlet; 72. Second refrigerant inlet / outlet; 73. Liquid outlet; 74. Gas outlet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0024] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0026] See also Figure 1As shown, according to an embodiment of the present invention, an air conditioning system is provided, comprising a compressor 4, a first heat exchanger 1, an intercooler 7, and a second heat exchanger 5 connected to form a refrigerant circulation loop. The intercooler 7 has a liquid outlet 73. The intercooler 7 is used to draw out the liquid refrigerant after internal gas-liquid separation through the liquid outlet 73. A first throttling device 61 is provided in the flow path between the intercooler 7 and the first heat exchanger 1, and / or a second throttling device 62 is provided in the flow path between the intercooler 7 and the second heat exchanger 5. The compressor 4 has a gas inlet 44. The aforementioned liquid outlet 73 is connected to the gas inlet 44 through a heating channel 12, which is used to heat the refrigerant flowing through it.

[0027] In the above example, the liquid refrigerant at the bottom of the intercooler can flow from the liquid outlet 73 into the gas replenishment port 44 of the compressor 4 through the heating channel 12. The heating channel 12 heats the liquid refrigerant flowing through it into a gaseous state, thus allowing the liquid refrigerant at the bottom of the intercooler 7 to participate in gas replenishment. Compared to the prior art method of using gaseous refrigerant at the top of the intercooler for gas replenishment, this invention utilizes the liquid refrigerant at the bottom of the intercooler 7, thus enriching the types of gas replenishment available in the prior art and providing users with more options for gas replenishment.

[0028] When the gaseous refrigerant in the intercooler 7 also participates in the gas replenishment, the two work together to achieve multi-channel gas replenishment to the compressor 4, increase the gas replenishment amount of the compressor 4, increase the refrigerant circulation amount on the high-pressure side, and improve the low-temperature heating capacity of the air conditioning system.

[0029] In some embodiments, the aforementioned intercooler 7 may be a flash evaporator, economizer, or other device that uses flash evaporation to achieve gas-liquid separation.

[0030] In some embodiments, the aforementioned intercooler 7 has a first refrigerant inlet / outlet 71 and a second refrigerant inlet / outlet 72. The aforementioned intercooler 7 is connected to the first heat exchanger 1 through the first refrigerant inlet / outlet 71, and the intercooler 7 is connected to the second heat exchanger 5 through the second refrigerant inlet / outlet 72.

[0031] In some embodiments, the aforementioned first heat exchanger 1 can be an indoor heat exchanger, and the second heat exchanger 5 can be an outdoor heat exchanger, which can be a finned heat exchanger, etc.

[0032] To achieve the function of heating the refrigerant flowing through the aforementioned heating channel 12, in the first example, as... Figure 1 or Figure 3As shown, the aforementioned air conditioning system may include a third heat exchanger 11, which has a heat exchange channel serving as a heating channel 12. This heat exchange channel can exchange heat with the exhaust pipe of the compressor 4 to heat the refrigerant flowing through it. In a specific application example, the aforementioned third heat exchanger 11 may be a shell-and-tube heat exchanger, which contacts the exhaust pipe of the compressor 4 through the outer wall of the shell and tube, so that the heat exchange channel can exchange heat with the exhaust pipe of the compressor 4. The outer wall of the shell and tube can be tightly fitted to the outer wall of the exhaust pipe of the compressor 4 to improve the heat exchange efficiency between the exhaust pipe of the compressor 4 and the third heat exchanger 11.

[0033] The exhaust pipe of the compressor 4 is a high-temperature pipe. In the above example, by exchanging heat between the heat exchange channel and the exhaust pipe of the compressor 4, the high temperature of the exhaust pipe can be used to heat the refrigerant in the heat exchange channel, i.e., the heating channel 12, thereby realizing the function of heating the refrigerant flowing through the heating channel 12.

[0034] To achieve the function of heating the refrigerant flowing through the aforementioned heating channel 12, in the second example, as... Figure 2 or Figure 4 As shown, a heater 14 may be provided on the aforementioned heating channel 12. The heating channel 12 heats the refrigerant flowing through it through the heater 14.

[0035] The heater 14 mentioned above can be an electric heater, such as an electric heating belt. The electric heating belt can be wrapped around the outer wall of the heating channel 12 to use the heat of the electric heating belt to heat the liquid refrigerant flowing through the heating channel 12, causing it to evaporate into gaseous refrigerant.

[0036] In some implementations, such as Figure 1 As shown, the aforementioned intercooler 7 also has a gas outlet 74, which is used to draw out the gaseous refrigerant after internal gas-liquid separation. The gas outlet 74 is connected to the aforementioned gas supply port 44 to provide gas supply and enthalpy enhancement to the compression device 4.

[0037] In existing technologies, only the gaseous refrigerant at the top of the intercooler is used for replenishment, while the liquid refrigerant at the bottom of the intercooler cannot participate in the replenishment. This results in a low replenishment volume for the compressor, leading to insufficient low-temperature heating capacity of the air conditioning system. In the example above, the intercooler 7 of this invention replenishes the compressor 4 with gaseous refrigerant after internal gas-liquid separation through gas outlet 74. On the other hand, the intercooler 7 also draws out liquid refrigerant after internal gas-liquid separation, heats it into gaseous refrigerant, and replenishes it with compressor 4 through liquid outlet 73. The combination of these two methods enables multi-channel replenishment of compressor 4, increasing the replenishment volume of compressor 4, increasing the refrigerant circulation volume on the high-pressure side, and improving the low-temperature heating capacity of the air conditioning system.

[0038] In some embodiments, the pipelines of the aforementioned liquid outlet 73 and gas outlet 74 are both connected to the gas supply port 44 via a connecting pipeline 13. In example A, for instance... Figure 1 or Figure 2 As shown, the heating channel 12 can be installed on the pipeline of the liquid outlet 73. At this time, the liquid refrigerant in the pipeline of the liquid outlet 73 is heated into gaseous refrigerant by the heating channel 12, and then mixed with the gaseous refrigerant in the pipeline of the gas outlet 74 and flows into the gas supply port 44 of the compressor through the collection pipeline 13.

[0039] In example 2A, such as Figure 3 or Figure 4 As shown, the heating channel 12 can be installed on the main pipe 13. At this time, the liquid refrigerant in the pipe of liquid outlet 73 mixes with the gaseous refrigerant in the pipe of gas outlet 74. The heating channel 12 heats the mixed two-phase refrigerant to heat the liquid refrigerant in the two-phase refrigerant into a gaseous state. Then, the refrigerant heated by the heating channel 12 is introduced into the gas supply port 44 of the compression device.

[0040] In both the first A and second A examples described above, the heating channel 12 can be positioned to heat the liquid refrigerant flowing from the liquid outlet 73. However, it should be noted that in the second A example, by placing the heating channel 12 on the main pipe 13, the heat from the heating channel 12 is used to heat the gas-liquid two-phase refrigerant mixture. Since some of the heat from the heating channel 12 is absorbed by the gaseous refrigerant in the gas-liquid phase, it cannot be fully utilized to heat the liquid refrigerant, resulting in a waste of heat. In the first A example, by placing the heating channel 12 on the pipe leading to the liquid outlet 73, all the heat from the heating channel 12 can be used to heat the liquid refrigerant, thus making full use of its heat. Therefore, the first A example provides a better heating effect for the liquid refrigerant compared to the second A example.

[0041] In some implementations, such as Figure 1-4 As shown, a first control valve 10 can be installed on the aforementioned mains pipe 13. The first control valve 10 can be an electronic expansion valve, etc. The first control valve 10 can regulate the refrigerant flow rate into the gas supply port 44. In some specific application examples, such as... Figure 3 or Figure 4 As shown, when the aforementioned heating channel 12 is installed on the main pipeline 13, the first control valve 10 can be located on the downstream side of the heating channel 12.

[0042] In some implementations, such as Figure 1-4 As shown, a second control valve 9 may be installed on the pipeline of the aforementioned liquid outlet 73. This second control valve 9 may be an electronic expansion valve, etc.

[0043] In the example above, the refrigerant flow rate at the liquid outlet 73 can be adjusted using the second control valve 9. Specifically, the refrigerant flow rate at the liquid outlet 73 can be adjusted based on parameters such as outdoor ambient temperature and exhaust pressure, thereby regulating the refrigerant supply to the compressor 4.

[0044] In some implementations, such as Figure 1 or Figure 2 As shown, when the aforementioned heating channel 12 is installed on the pipeline of the liquid outlet 73, the aforementioned second control valve 9 can be located on the upstream side of the heating channel 12.

[0045] It should be noted that the aforementioned liquid outlet 73 pipeline may also be referred to as a liquid replenishment branch in some situations, and the aforementioned gas outlet 74 pipeline may also be referred to as a gas replenishment branch in some situations.

[0046] In some embodiments, the aforementioned compression device 4 may have a first compression chamber 41, an intermediate chamber 43, and a second compression chamber 42. The exhaust port of the first compression chamber 41 is connected to the intake port of the second compression chamber 44 through the intermediate chamber 43. The aforementioned supplementary air port 44 is disposed in the intermediate chamber 43.

[0047] In the above example, the aforementioned intermediate cavity 40 can use the high-temperature gas discharged from the first compression cavity 41 to reheat the refrigerant flowing in from the gas inlet 44, which helps to make all the liquid refrigerant evaporate into gaseous refrigerant, avoid the compressor 4 from sucking in gas with liquid, and reduce the exhaust temperature of the compressor 4, thereby improving the reliability of the air conditioning system.

[0048] In order to provide the aforementioned intermediate cavity 40, in some embodiments, such as Figure 1As shown, the aforementioned compression device 4 includes a high-pressure cylinder 4a and a low-pressure cylinder 4b. The compression chamber inside the low-pressure cylinder 4b forms the aforementioned first compression chamber 41, and the compression chamber inside the high-pressure cylinder 4a forms the aforementioned second compression chamber 42. The exhaust port of the low-pressure cylinder 4b is connected to the intake port of the high-pressure cylinder 4a through a connecting channel 43. The connecting channel 43 forms the aforementioned intermediate chamber 40.

[0049] In some implementations, such as Figure 1 As shown, the aforementioned refrigerant circulation loop is also equipped with a four-way valve 3, through which the air conditioning system can switch between heating and cooling modes. In a specific application example, the compressor 4 is connected to one interface of the four-way valve 3 through the exhaust port of the second compression chamber 42, and to the other interface of the four-way valve 3 through the intake port of the first compression chamber 41. One end of the aforementioned first heat exchanger 1 and one end of the second heat exchanger 5 are connected to the other two interfaces of the four-way valve 3 respectively.

[0050] In some implementations, such as Figure 1 As shown, the suction port of the aforementioned first compression chamber 41 is connected to the four-way valve 3 through the gas-liquid separator 2. The gas-liquid separator 2 separates the refrigerant flowing into the first compression chamber 41 into gas and liquid components, thus preventing liquid from being drawn into the compressor 4.

[0051] During the cooling cycle of the air conditioning system: Because of the refrigeration cycle, the air conditioning system generally operates in normal or high temperature environments. The compressor unit 4 has a moderate load and does not need to increase the refrigerant circulation flow. The refrigeration cycle generally does not require gas replenishment.

[0052] The refrigerant absorbs heat fully and evaporates completely in the evaporator. The exhaust temperature is normal, so no additional refrigerant is needed. Because refrigerant is supplied as a low-temperature gas, forcibly adding refrigerant would actually reduce compression efficiency, leading to decreased energy efficiency. Therefore, refrigeration cycles generally do not require refrigerant injection.

[0053] The air conditioning system's refrigeration cycle process is as follows: Figure 1 As shown, the high-temperature, high-pressure gas from the compressor 4 enters the second heat exchanger 5 (the second heat exchanger 5 is the outdoor heat exchanger) after passing through the four-way valve 3. After exchanging heat with the air and condensing into a high-pressure, high-temperature liquid, it is throttled by the second throttling device 62. At this time, both the first control valve 10 and the second control valve 9 are closed, and no gas or liquid replenishment is required. After passing through the intercooler 7, it is throttled by the first throttling device 61 and enters the first heat exchanger 1 (the first heat exchanger 1 is the indoor heat exchanger) to absorb heat. The refrigerant gas then enters the gas-liquid separator 2 after passing through the four-way valve 3, and then returns to the compressor 4, completing the refrigeration cycle.

[0054] When the air conditioning system is in heating cycle: In low-temperature environments, the evaporator's heat absorption capacity decreases, and the exhaust temperature of the compressor 4 becomes too high. Injection of gas is necessary to increase heating capacity, lower exhaust temperature, protect the compressor 4, and improve system reliability. Simply injecting gas into the intercooler 7 (e.g., the upper part of the flash evaporator) has limited capacity. Therefore, a portion of the liquid from the bottom of the intercooler 7 is added to the injection port 44 of the compressor 4. This liquid refrigerant absorbs the heat from the first stage of compression in the low-pressure cylinder 4b, evaporates into gas, and, together with the gas from the upper part of the intercooler 7, enters the high-pressure cylinder 4a, where it is further compressed into a high-temperature, high-pressure gas. To ensure that the liquid refrigerant drawn from the intercooler can completely evaporate into gas before entering the high-pressure cylinder 4a, a heating channel 12 can be installed downstream of the liquid outlet 73. This allows a portion of the liquid refrigerant to be heated into gas before entering the compressor 4, such as through a heat exchanger, before passing through the injection port 44. This ensures that the gas-liquid mixture entering the compressor 4 absorbs heat and evaporates into gas, preventing liquid carryover in the compressor 4.

[0055] High-temperature, high-pressure gas is discharged from the compressor 4 and enters the refrigerant refrigerant unit. It undergoes heat exchange in the condenser and condenses into a high-pressure liquid, continuing the subsequent heating cycle. Since the intercooler 7, such as the flash evaporator, separates low-temperature, low-pressure make-up gas, the low temperature of the make-up gas can reduce the exhaust temperature of the compressor 4, decrease the power consumption of the compressor 4, increase the refrigerant circulation volume, and improve the low-temperature heating capacity.

[0056] The heating cycle process of the air conditioning system is as follows: Figure 1As shown, the high-temperature, high-pressure gas from the compressor 4 enters the first heat exchanger 1 (the first heat exchanger 1 is an indoor heat exchanger) after passing through the four-way valve 3. After condensing into a high-temperature, high-pressure liquid in the first heat exchanger 1, it passes through the first throttling device 61 and enters the intercooler 7, such as a flash evaporator. At this time, both the first control valve 10 and the second control valve 9 are open, and the opening degree is determined according to the required gas and liquid replenishment amounts of the system, which is controlled by the control module. Part of the liquid refrigerant at the bottom of the intercooler 7 is partially evaporated into gaseous refrigerant through the second control valve 9 and the heating channel 12, and then merges with the gaseous refrigerant separated from the upper part of the intercooler 7. After passing through the first control valve 10, it enters the intermediate chamber 40 of the compressor 4. The medium-pressure, high-temperature gas output from the low-pressure cylinder 4b mixes with the replenishing gas and liquid in the intermediate chamber 40. This part of the liquid refrigerant absorbs the heat from the first-stage compression of the low-pressure cylinder 4b (the low-pressure cylinder 4b is responsible for compressing the low-temperature, low-pressure superheated gas from the evaporator into medium-pressure, high-temperature gas) and evaporates into gaseous refrigerant, and then... The gaseous refrigerant from the upper part of the intercooler 7 enters the second compression chamber 42 of the high-pressure cylinder 4a, where it is further compressed into a high-temperature, high-pressure gas. A small portion of the liquid refrigerant in the intermediate chamber 40 has evaporated into gas because the superheated gas needs to absorb heat to become saturated gas before entering the second compression chamber 42. At this point, there is no liquid refrigerant left; all that enters the second compression chamber 42 is gaseous refrigerant, which is further compressed into a high-temperature, high-pressure gas. This high-temperature, high-pressure gas is discharged from the exhaust port of the second compression chamber 42 and enters the first heat exchanger 1 (the first heat exchanger 1 is the indoor heat exchanger). The other end of the intercooler 7 is connected to the second throttling device 62. The liquid refrigerant at the bottom of the intercooler 7 is throttled by the second throttling device 62 and enters the second heat exchanger 5 (the second heat exchanger 5 is the outdoor heat exchanger) to absorb heat. The refrigerant gas then passes through the four-way valve 3 and enters the gas-liquid separator 2, before returning to the compression unit 4, completing the heating cycle. The opening degree adjustment of both the first control valve 10 and the second control valve 9 is related to the exhaust pressure, ambient temperature, and capacity, and is controlled by the control module.

[0057] The second control valve 9 can be an electronic expansion valve. Its function is to regulate the refrigerant flow rate at the liquid outlet 73 of the intercooler 7. The refrigerant flow rate is adjusted by regulating the valve opening. The flow rate can be adjusted based on parameters such as outdoor ambient temperature and exhaust pressure, thereby regulating the refrigerant supply. The aforementioned first control valve 10 can also be an electronic expansion valve. Its function is also to regulate the refrigerant flow rate by adjusting its opening.

[0058] In this invention, the liquid refrigerant supplied from the intercooler 7 to the compression device 4 mixes with the gaseous refrigerant supplied to the compression device 4 in the intermediate cavity 40 and is converted into gaseous refrigerant after absorbing heat. Compared with a single gas supply system, more gas is supplied. Compared with a single gas supply system that can only supply part of the gas from the intercooler, such as the flash evaporator, to the compression device 4, the amount of gas supplied is increased, the amount of refrigerant circulation on the high-pressure side is increased, and the low-temperature heating capacity is improved.

[0059] By setting a third heat exchanger 11 or heater 14 on the downstream side of the liquid outlet 73, the refrigerant liquid can be partially evaporated into gas before entering the intermediate cavity 40 of the compression device 4. This avoids the liquid refrigerant from failing to completely evaporate into gas in the intermediate cavity 40 of the compression device 4, causing the compression device 4 to suck in gas while carrying liquid, which would affect the reliability and performance of the system.

[0060] In some implementations, the aforementioned intercooler 7 can be a flash evaporator. Since the intercooler 7 has a first refrigerant inlet / outlet 71, a second refrigerant inlet / outlet 72, a liquid outlet 73, and a gas outlet 74, it has a four-pipe structure. Specifically, in this invention, the four-pipe flash evaporator and compression device 4, during the heating cycle, can supplement some of the liquid at the bottom of the flash evaporator and the gas at the top into the intermediate chamber 40 of the compression device 4.

[0061] This invention utilizes a four-pipe flash evaporator and a two-stage compression device 4 to supplement some of the liquid at the bottom of the flash evaporator into the intermediate chamber 40 of the compression device 4, thereby increasing the gas supply to the compression device 4, increasing the refrigerant circulation on the high-pressure side, and improving the low-temperature heating capacity. Simultaneously, a third heat exchanger 11 is installed downstream of the liquid outlet of the intercooler 7, which allows the refrigerant liquid to evaporate into gas, preventing the compression device 4 from drawing in gas while carrying liquid, reducing the exhaust temperature of the compression device 4, and improving system reliability.

[0062] The technical solution of this utility model can ensure that the exhaust temperature of the compressor 4 does not exceed 100℃, effectively reducing the exhaust temperature of the compressor 4. Moreover, the heating capacity of the air conditioning system does not decrease at an ambient temperature of -20℃, and the energy efficiency is improved by about 10%, thus improving the low-temperature heating capacity of the air conditioning system.

[0063] In some embodiments, the present invention also provides an air conditioner that includes any of the above-described air conditioning systems.

[0064] The aforementioned air conditioning system can be a heat pump system, and correspondingly, the aforementioned air conditioner is a heat pump air conditioner.

[0065] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An air conditioning system, characterized in that: The device includes a compressor (4) forming a refrigerant circulation loop, a first heat exchanger (1), an intercooler (7), and a second heat exchanger (5); the intercooler (7) is provided with a liquid outlet (73), and the intercooler (7) is used to draw out the liquid refrigerant after internal gas-liquid separation through the liquid outlet (73); wherein, a first throttling device (61) is provided in the flow path between the intercooler (7) and the first heat exchanger (1), and / or a second throttling device (62) is provided in the flow path between the intercooler (7) and the second heat exchanger (5); The compression device (4) has an air inlet (44), and the liquid outlet (73) is connected to the air inlet (44) through a heating channel (12), which is used to heat the refrigerant flowing through it.

2. The air conditioning system according to claim 1, characterized in that: The air conditioning system includes a third heat exchanger (11) having a heat exchange channel as the heating channel (12) capable of exchanging heat with the exhaust pipe of the compressor (4).

3. The air conditioning system according to claim 2, characterized in that: The third heat exchanger (11) is a shell-and-tube heat exchanger. The shell-and-tube heat exchanger contacts the exhaust pipe of the compression device (4) through the outer wall of the shell and tube so that the heat exchange channel can exchange heat with the exhaust pipe of the compression device (4).

4. The air conditioning system according to claim 1, characterized in that: The heating channel (12) is equipped with a heater (14), and the heating channel (12) heats the refrigerant flowing through it through the heater (14).

5. The air conditioning system according to any one of claims 1-4, characterized in that: The intercooler (7) also has a gas outlet (74), which is used to draw out the gaseous refrigerant after internal gas-liquid separation through the gas outlet (74); wherein the gas outlet (74) is connected to the gas supply port (44).

6. The air conditioning system according to claim 5, characterized in that: The pipeline of the liquid outlet (73) and the pipeline of the gas outlet (74) are both connected to the gas supply port (44) via a connecting pipeline (13); wherein, The heating channel (12) is located on the pipeline of the liquid outlet (73); or, the heating channel (12) is located on the main pipeline (13).

7. The air conditioning system according to claim 6, characterized in that: The main pipeline (13) is provided with a first control valve (10); and / or, the liquid outlet (73) is provided with a second control valve (9).

8. The air conditioning system according to any one of claims 1-4 and 6-7, characterized in that: The compression device (4) has a first compression chamber (41), an intermediate chamber (43), and a second compression chamber (42). The exhaust port of the first compression chamber (41) is connected to the intake port of the second compression chamber (44) through the intermediate chamber (43). The replenishment port (44) is located in the intermediate chamber (43).

9. The air conditioning system according to claim 8, characterized in that: The compression device (4) includes a high-pressure cylinder (4a) and a low-pressure cylinder (4b). The compression chamber inside the low-pressure cylinder (4b) forms the first compression chamber (41), and the compression chamber inside the high-pressure cylinder (4a) forms the second compression chamber (42). The exhaust port of the low-pressure cylinder (4b) is connected to the intake port of the high-pressure cylinder (4a) through a connecting channel (43). The connecting channel (43) forms the intermediate chamber (40).

10. The air conditioning system according to any one of claims 1-4, 6-7, and 9, characterized in that: The intercooler (7) is a flash evaporator or an economizer.

11. An air conditioner, characterized in that: The air conditioning system included in any one of claims 1-10.

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