Refrigeration cycle system

Abstract

The utility model discloses a refrigeration cycle system which comprises a compressor, a first-stage impeller, a second-stage impeller, a first-stage compressor, a second-stage compressor, a first-stage compressor and a second-stage compressor, the compressor, the condenser and the evaporator are sequentially connected in series and form a refrigerant loop; the flash type economizer is communicated between the condenser and the evaporator, the flash type economizer is provided with a medium-pressure air supply port, and the medium-pressure air supply port is communicated between the first-stage impeller and the second-stage impeller; wherein a flow dividing pipeline is further communicated between the condenser and the evaporator, and the flow dividing pipeline and the flash type economizer are distributed in parallel. According to the refrigeration cycle system, the flow dividing pipeline and the flash type economizer are distributed in parallel, the amount of refrigerants entering the flash type economizer can be reduced, and therefore the volume and the volume of the flash type economizer can be reduced, the material consumption of the flash type economizer is reduced, and the installation cost and the material cost of the flash type economizer are reduced; and the filling amount of the refrigerant can be reduced, and the environmental protection value is improved.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration cycle technology, and in particular to a refrigeration cycle system. Background Technology

[0002] Traditional refrigeration cycle systems typically use large flash economizers. Due to the large size of the economizers, the installation and material costs are high, and the refrigerant charge is also large. Since the refrigerant commonly used in China is R134a, which has a high GWP (Global Warming Potential), there is room for improvement. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a refrigeration cycle system that can replenish gas to the compressor, increase the refrigeration capacity of the refrigeration cycle system, reduce the volume and size of the flash economizer, reduce the material usage of the flash economizer, lower the installation and material costs of the flash economizer, and reduce the amount of refrigerant charged, thereby improving environmental value.

[0004] A refrigeration cycle system according to an embodiment of the present invention includes: a compressor, wherein the compressor is provided with a first-stage impeller and a second-stage impeller; a condenser and an evaporator, wherein the compressor, the condenser and the evaporator are connected in series to form a refrigerant circuit; and a flash economizer, wherein the flash economizer is connected between the condenser and the evaporator, and the flash economizer is provided with a medium-pressure gas inlet, which is connected between the first-stage impeller and the second-stage impeller; wherein a branch pipe is also connected between the condenser and the evaporator, and the branch pipe is distributed in parallel with the flash economizer.

[0005] According to the refrigeration cycle system of this utility model embodiment, by connecting the evaporator, compressor, and condenser in series to form a refrigerant circuit, the refrigerant can flow inside to directionally transfer heat from the low-temperature region to the high-temperature region, thereby maintaining the low-temperature state of the target environment. At the same time, the medium-pressure gas injection port of the flash economizer is connected between the first-stage impeller and the second-stage impeller, so that the gaseous refrigerant after gas-liquid separation can enter the compressor to replenish the compressor and increase the cooling capacity of the refrigeration cycle system. Furthermore, by distributing the distribution pipeline in parallel with the flash economizer, the amount of refrigerant entering the flash economizer can be reduced, thereby reducing the volume and size of the flash economizer, reducing the amount of material used in the flash economizer, lowering the installation and material costs of the flash economizer, and reducing the amount of refrigerant charged, thus improving environmental value.

[0006] According to some embodiments of the refrigeration cycle system of the present invention, a first control valve is provided between the flash economizer and the condenser; and / or, a flow control valve is provided in the branch line.

[0007] The refrigeration cycle system according to some embodiments of the present invention further includes a liquid level detection element and a control element. The liquid level detection element is disposed on the flash economizer and is used to detect the liquid level height in the flash economizer. The first control valve, the flow control valve, and the liquid level detection element are all electrically connected to the control element, and the control element is used to control the first control valve and the flow control valve according to the liquid level height.

[0008] According to some embodiments of the present invention, in the refrigeration cycle system, the outlet end of the diversion pipeline is connected between the flash economizer and the evaporator.

[0009] According to some embodiments of the refrigeration cycle system of the present invention, a primary throttling pipeline is connected between the condenser and the flash economizer, a secondary throttling pipeline is connected between the flash economizer and the evaporator, and the outlet end of the branch pipeline is connected to the secondary throttling pipeline.

[0010] According to some embodiments of the refrigeration cycle system of the present invention, the primary throttling pipeline is provided with a first orifice plate; and / or, the secondary throttling pipeline is provided with a second orifice plate, and the outlet end of the diversion pipeline is connected to the flash economizer and the second orifice plate.

[0011] According to some embodiments of the refrigeration cycle system of the present invention, the flash economizer is provided with a liquid inlet and a liquid outlet, the condenser is provided with a first outlet and a second outlet, the liquid inlet is connected to the first outlet, and the second outlet is connected to the inlet end of the diversion pipeline.

[0012] According to some embodiments of the refrigeration cycle system of the present invention, the first outlet and the second outlet are both located at the bottom of the condenser, and the first outlet and the second outlet are respectively located on opposite sides of the condenser.

[0013] According to some embodiments of the refrigeration cycle system of the present invention, the flash economizer is constructed as a horizontal economizer or a vertical economizer.

[0014] According to some embodiments of the refrigeration cycle system of the present invention, the flash economizer is further provided with a liquid baffle; and / or, a second control valve is provided between the medium-pressure gas inlet and the compressor.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of a refrigeration cycle system according to an embodiment of the present utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of a refrigeration cycle system according to an embodiment of the present utility model. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the structure of the flash economizer according to an embodiment of the present utility model. Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the structure of the flash economizer according to an embodiment of the present utility model. Figure 2 ;

[0021] Figure 5 This is a schematic diagram of the structure of the flash economizer according to an embodiment of the present utility model. Figure 3 ;

[0022] Figure 6 This is a schematic diagram of the structure of the flash economizer according to an embodiment of the present utility model. Figure 4 ;

[0023] Figure 7 This is a schematic diagram of the structure of the flash economizer according to an embodiment of the present utility model. Figure 5 ;

[0024] Figure 8 This is a schematic diagram of the structure of the flash economizer according to an embodiment of the present utility model. Figure 6 .

[0025] Figure label:

[0026] Refrigeration cycle system 100,

[0027] Compressor 1, suction pipe 11, discharge pipe 12, condenser 2, first outlet 21, second outlet 22, evaporator 3, charging valve 31.

[0028] Flash-type economizer 4, medium-pressure air supply port 41, liquid inlet 42, liquid outlet 43, first control valve 44, second control valve 45, primary throttling pipeline 46, first orifice plate 461, secondary throttling pipeline 47, second orifice plate 471, liquid baffle 48.

[0029] Diversion pipe 5, flow control valve 51, first pipe 6, second pipe 7. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and 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 of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The following is for reference. Figure 1The refrigeration cycle system 100 according to an embodiment of the present invention is described. The core function of the refrigeration cycle system 100 is to achieve the directional transfer of heat from the low temperature region to the high temperature region through the circulation of the refrigerant, thereby maintaining the low temperature state of the target environment. The refrigeration cycle system 100 includes a compressor 1. The function of the compressor 1 is to mechanically compress the low-pressure gaseous refrigerant, so that its pressure and temperature are significantly increased, providing the necessary conditions for the subsequent condensation and heat release process.

[0034] The compressor 1 contains a primary impeller and a secondary impeller. Both impellers can perform work on the gas, converting mechanical energy into pressure energy and kinetic energy through high-speed rotation. The low-temperature, low-pressure gaseous refrigerant, upon entering the compressor 1, first flows to the primary impeller. Under the action of the impeller blades, it rotates at high speed. Due to the centrifugal force and the diffusion flow of the primary impeller, the pressure, velocity, and temperature of the low-temperature, low-pressure gaseous refrigerant increase as it exits the primary impeller, transforming it into a medium-temperature, medium-pressure gaseous refrigerant. This achieves primary compression of the gaseous refrigerant. The compressed gaseous refrigerant then flows further to the secondary impeller. Under the action of the impeller blades, it rotates at high speed. Again, due to the centrifugal force and the diffusion flow of the secondary impeller, the pressure, velocity, and temperature of the medium-temperature, medium-pressure gaseous refrigerant increase as it exits the secondary impeller, transforming it into a high-temperature, high-pressure gaseous refrigerant. This achieves secondary compression of the gas.

[0035] Therefore, by setting a first-stage impeller and a second-stage impeller, two-stage compression of the refrigerant can be achieved, which can significantly improve the energy efficiency, reliability and operating range of compressor 1, and reduce the pressure ratio of each stage of compression, thereby reducing internal and external leakage of each stage of compression, improving the volumetric efficiency and adiabatic efficiency of each stage. Moreover, dividing the compression process into two stages makes the energy consumption of each stage smaller, thereby reducing the total energy consumption. Compressor 1 can be a centrifugal compressor.

[0036] like Figure 1 As shown, the refrigeration cycle system 100 also includes a condenser 2 and an evaporator 3. The condenser 2 is the core heat exchange component in the refrigeration cycle system 100. Its function is to cool and condense the high-temperature and high-pressure gaseous refrigerant into a liquid state, while releasing heat to the environment. The evaporator 3 is another core heat exchange component in the refrigeration cycle system 100. Its function is to absorb heat from the low-temperature medium to evaporate the liquid refrigerant into a gaseous state. The low-temperature medium can be cooling water.

[0037] Compressor 1, condenser 2, and evaporator 3 are connected in series to form a refrigerant circuit. Any one of these components can be simultaneously connected to the other two, creating a refrigerant circuit that allows the refrigerant to circulate and transfer heat directionally from a low-temperature region to a high-temperature region. Specifically, the low-temperature, low-pressure liquid refrigerant undergoes heat exchange, boiling, and evaporation with cooling water in evaporator 3. The refrigerant absorbs heat from the low-temperature water, becoming a gaseous refrigerant with a certain degree of superheat before entering compressor 1. In compressor 1, it is compressed to medium pressure by a first-stage impeller and then becomes a high-temperature, high-pressure gaseous refrigerant after passing through a second-stage impeller. It then enters condenser 2, where it exchanges heat with cooling water, releasing heat and condensing to become a liquid refrigerant with a certain degree of supercooling before entering evaporator 3. This process enables the refrigerant to circulate and transfer heat directionally from a low-temperature region to a high-temperature region.

[0038] It should be noted that the inlet and outlet ends of the compressor 1 are respectively connected to the suction pipe 11 and the discharge pipe 12. The end of the suction pipe 11 away from the compressor 1 is connected to the evaporator 3, and the end of the discharge pipe 12 away from the compressor 1 is connected to the condenser 2. This allows the compressor 1 to be connected to the evaporator 3 and the condenser 2 respectively, thereby forming a refrigerant circuit. The evaporator 3 is equipped with a charging valve 31, which can be opened or closed to selectively connect or disconnect the inlet of the evaporator 3 from the outside. When the charging valve 31 is open, refrigerant can be charged into the evaporator 3 through the inlet of the evaporator 3. When the charging valve 31 is closed, the charging of refrigerant into the evaporator 3 can be stopped.

[0039] like Figure 2 As shown, the refrigeration cycle system 100 also includes a flash economizer 4. The flash economizer 4 is used for flashing and gas-liquid separation to deliver gaseous and liquid refrigerant to different locations. Connecting the flash economizer 4 between the condenser 2 and the evaporator 3 allows the flash economizer 4 to be connected to both the condenser 2 and the evaporator 3, enabling the liquid refrigerant after condensation in the condenser 2 to enter the flash economizer 4 for flashing and gas-liquid separation. The process involves the expansion of a portion of the liquid refrigerant to form a gaseous refrigerant. After gas-liquid separation, the liquid refrigerant can enter the evaporator 3. The flash economizer 4 is equipped with a medium-pressure gas inlet 41, which is used to discharge the gaseous refrigerant after gas-liquid separation. By connecting the medium-pressure gas inlet 41 to the space between the first-stage impeller and the second-stage impeller, the gaseous refrigerant after gas-liquid separation can be delivered to the compressor 1 to replenish the compressor 1, thereby increasing the suction volume of the compressor 1 and improving the cooling capacity of the refrigeration cycle system 100.

[0040] It should be noted that during the operation of the entire refrigeration cycle system 100, the gas replenishment pressure Pe needs to be controlled at a relatively optimal pressure to ensure good cycle performance. In actual design, the medium-pressure gas replenishment port 41 can be set above the flash economizer 4 to utilize the upward movement of gas so that the gaseous refrigerant can move towards the medium-pressure gas replenishment port 41 to replenish the compressor 1.

[0041] The condenser 2 and evaporator 3 are connected by a distribution pipe 5, which is connected in parallel with the flash economizer 4. This means that while the condenser 2 and evaporator 3 are connected through the flash economizer 4, the condenser 2 and evaporator 3 are also connected through the distribution pipe 5. This allows the condenser 2 to be simultaneously connected to both the flash economizer 4 and the distribution pipe 5, enabling the refrigerant from the condenser 2 to flow to both the flash economizer 4 and the distribution pipe 5. Consequently, the distribution pipe 5 can divert the refrigerant from the condenser 2, reducing the amount of refrigerant flowing to the flash economizer 4. This reduces the amount of refrigerant entering the flash economizer 4, thereby reducing its volume and size, material usage, installation and material costs, and refrigerant charge, thus improving environmental value.

[0042] According to the refrigeration cycle system 100 of this utility model embodiment, by connecting the evaporator 3, compressor 1, and condenser 2 in series to form a refrigerant circuit, the refrigerant can flow inside to directionally transfer heat from the low-temperature region to the high-temperature region, thereby maintaining the low-temperature state of the target environment. At the same time, the medium-pressure gas injection port 41 of the flash economizer 4 is connected between the first-stage impeller and the second-stage impeller, so that the gaseous refrigerant after gas-liquid separation can enter the compressor 1 to replenish the compressor 1, thereby increasing the cooling capacity of the refrigeration cycle system 100. Furthermore, by distributing the branch pipe 5 in parallel with the flash economizer 4, the amount of refrigerant entering the flash economizer 4 can be reduced, thereby reducing the volume and size of the flash economizer 4, reducing the material usage of the flash economizer 4, lowering the installation cost and material cost of the flash economizer 4, and reducing the refrigerant charge, thus improving environmental value.

[0043] In some embodiments, a first control valve 44 is provided between the flash economizer 4 and the condenser 2; and / or, a flow control valve 51 is provided in the branch line 5.

[0044] It should be noted that the flash economizer 4 is connected to the condenser 2, meaning that refrigerant can flow from the condenser 2 to the flash economizer 4. A first control valve 44 is provided between the flash economizer 4 and the condenser 2. The first control valve 44 is used to control the connection between the flash economizer 4 and the condenser 2. By adjusting the opening of the first control valve 44, the connection between the flash economizer 4 and the condenser 2 can be controlled, thereby controlling the amount of refrigerant entering the flash economizer 4. At the same time, the distribution pipe 5 is connected between the condenser 2 and the evaporator 3. A flow control valve 51 is provided in the distribution pipe 5. The flow control valve 51 is used to control the connection between the condenser 2 and the evaporator 3, thereby controlling the amount of refrigerant entering the distribution pipe 5. Thus, the amount of refrigerant entering the flash economizer 4 can be reliably controlled through the cooperation of the first control valve 44 and the flow control valve 51, and the reliability of the gas supply to the compressor 1 can be ensured.

[0045] The liquid level Le inside the flash economizer 4 can be controlled by controlling the amount of refrigerant entering the flash economizer 4, so as to stabilize the liquid level inside the flash economizer 4, ensure normal exhaust superheat, avoid the phenomenon of liquid carrying in the gas supply, and avoid affecting the compressor 1. The first control valve 44 can be an electric valve.

[0046] In some embodiments, the refrigeration cycle system 100 further includes a liquid level detection element and a control element. The liquid level detection element is disposed on the flash economizer 4 and is used to detect the liquid level height in the flash economizer 4. The first control valve 44, the flow control valve 51 and the liquid level detection element are all electrically connected to the control element, and the control element is used to control the first control valve 44 and the flow control valve 51 according to the liquid level height.

[0047] The liquid level detection element is used to detect the liquid level height. It is installed inside the flash economizer 4 to detect the liquid level height within the flash economizer 4. The liquid level detection element can be a liquid level sensor. The control element controls the operation of the electrically connected components. The first control valve 44, flow control valve 51, and liquid level detection element are all electrically connected to the control element, allowing the control element to receive the detection result from the liquid level detection element and control the operation of the first control valve 44 and flow control valve 51. This allows the control element to control the first control valve 44 and flow control valve 51 based on the liquid level height detected by the liquid level detection element. The control element adjusts the opening degree of the first control valve 44 and flow control valve 51 according to the liquid level height to control the amount of refrigerant entering the flash economizer 4 and ensure reliable refrigerant supply to the compressor 1 from the flash economizer 4.

[0048] Therefore, the liquid level Le in the flash economizer 4 can be controlled by the cooperation of the first control valve 44, the flow control valve 51 and the liquid level detection element, so as to improve the reliability of controlling the liquid level in the flash economizer 4.

[0049] In some embodiments, the outlet end of the diversion line 5 is connected between the flash economizer 4 and the evaporator 3.

[0050] It should be noted that the flash economizer 4 and the distribution pipe 5 are connected in parallel between the condenser 2 and the evaporator 3. That is, both the flash economizer 4 and the distribution pipe 5 are connected to the evaporator 3. In other words, the refrigerant passing through the flash economizer 4 and the refrigerant passing through the distribution pipe 5 will flow towards the evaporator 3. By connecting the outlet end of the distribution pipe 5 to the flash economizer 4 and the evaporator 3, the distribution pipe 5 and the pipe between the flash economizer 4 and the evaporator 3 can share a section of the pipe, which can reduce the installation length of the pipe and reduce the installation cost.

[0051] In some embodiments, a primary throttling pipe 46 is connected between the condenser 2 and the flash economizer 4, a secondary throttling pipe 47 is connected between the flash economizer 4 and the evaporator 3, and the outlet end of the branch pipe 5 is connected to the secondary throttling pipe 47.

[0052] It is understandable that the flash economizer 4 is connected to both the condenser 2 and the evaporator 3. A primary throttling pipe 46 connects the condenser 2 and the flash economizer 4, allowing the refrigerant from the condenser 2 to enter the flash economizer 4 through the primary throttling pipe 46, thus improving the reliability of the refrigerant entering the flash economizer 4. Furthermore, a secondary throttling pipe 47 connects the flash economizer 4 and the evaporator 3, allowing the liquid refrigerant from the flash economizer 4 to enter the evaporator 3 through the secondary throttling pipe 47, further improving the reliability of the refrigerant entering the evaporator 3. This, in turn, enables the refrigerant to circulate.

[0053] Furthermore, by connecting the outlet end of the diversion pipe 5 to the secondary throttling pipe 47, the outlet end of the diversion pipe 5 can be connected to the space between the flash economizer 4 and the evaporator 3, allowing the diversion pipe 5 and the secondary throttling pipe 47 to share a section of the pipe, which can reduce the installation length of the pipe and lower the installation cost.

[0054] In some embodiments, the primary throttling line 46 is provided with a first orifice plate 461; and / or, the secondary throttling line 47 is provided with a second orifice plate 471, and the outlet end of the diversion line 5 is connected between the flash economizer 4 and the second orifice plate 471.

[0055] The first orifice plate 461 is a key device for flow regulation and pressure control. Its core function is to reduce the pressure and regulate the flow of fluid through local resistance. That is, the first orifice plate 461 can be used to throttle and reduce the pressure of refrigerant. The first-stage throttling pipeline 46 is connected between the condenser 2 and the flash economizer 4. By setting the first orifice plate 461 in the first-stage throttling pipeline 46, the first orifice plate 461 can be used to throttle and reduce the pressure of the high-temperature and high-pressure liquid refrigerant coming out of the condenser 2, so that the high-temperature and high-pressure liquid refrigerant becomes a medium-temperature and medium-pressure liquid refrigerant. Then, the medium-temperature and medium-pressure liquid refrigerant can enter the flash economizer 4, where it undergoes flashing and gas-liquid separation. The separated gaseous refrigerant enters between the first-stage impeller and the second-stage impeller of the compressor 1 to replenish the compressor 1. The separated liquid refrigerant enters the second-stage throttling pipeline 47.

[0056] Furthermore, the second orifice plate 471 is a key device for flow regulation and pressure control. Its core function is to reduce the pressure and regulate the flow of fluid through local resistance. That is, the second orifice plate 471 can be used to throttle and reduce the pressure of the refrigerant. By connecting the secondary throttling pipe 47 between the flash economizer 4 and the evaporator 3, and setting the second orifice plate 471 in the secondary throttling pipe 47, the second orifice plate 471 can be used to throttle and reduce the pressure of the medium-temperature and medium-pressure liquid refrigerant coming out of the flash economizer 4, so that the medium-temperature and medium-pressure liquid refrigerant becomes a low-temperature and low-pressure two-phase refrigerant. Then, the low-temperature and low-pressure two-phase refrigerant can enter the evaporator 3, where it undergoes phase change transformation and energy absorption processes to become a gaseous refrigerant.

[0057] Furthermore, by connecting the outlet end of the branch pipe 5 to the flash economizer 4 and the second orifice plate 471, the high-temperature and high-pressure liquid refrigerant from the condenser 2 can be transported to the second orifice plate 471 and mixed with the medium-temperature and medium-pressure liquid refrigerant from the flash economizer 4 before entering the second orifice plate 471 for throttling and pressure reduction, becoming a low-temperature and low-pressure two-phase refrigerant before entering the evaporator 3. This avoids the high-temperature and high-pressure liquid refrigerant directly entering the evaporator 3, which would prevent heat absorption and interruption of the refrigeration cycle, thereby avoiding system failure, efficiency reduction, or even equipment damage. It also reduces the number of second orifice plates 471 required, further reducing installation costs.

[0058] In some embodiments, the flash economizer 4 is provided with an inlet 42 and an outlet 43, and the condenser 2 is provided with a first outlet 21 and a second outlet 22. The inlet 42 is connected to the first outlet 21, and the second outlet 22 is connected to the inlet end of the diversion pipe 5.

[0059] It is understandable that a primary throttling pipe 46 connects the condenser 2 and the flash economizer 4, and a secondary throttling pipe 47 connects the flash economizer 4 and the evaporator 3. This allows the refrigerant from the condenser 2 to enter the flash economizer 4 through the primary throttling pipe 46, and the refrigerant from the flash economizer 4 to enter the evaporator 3 through the secondary throttling pipe 47. The flash economizer 4 is equipped with an inlet 42 and an outlet 43. The inlet 42 allows the refrigerant to enter the flash economizer 4, and the outlet 43 allows the refrigerant to flow out of the flash economizer 4. Thus, the flash economizer 4 is connected to the primary throttling pipe 46 through the inlet 42, and to the secondary throttling pipe 47 through the outlet 43, thereby achieving refrigerant circulation.

[0060] Meanwhile, the flash economizer 4 and the diversion line 5 are connected to the condenser 2 respectively. A first outlet 21 and a second outlet 22 are provided on the condenser 2. The first outlet 21 is connected to the liquid inlet 42, so that the condenser 2 can be connected to the flash economizer 4 through the first outlet 21, allowing some of the refrigerant from the condenser 2 to flow to the flash economizer 4. The second outlet 22 is connected to the inlet end of the diversion line 5, so that the condenser 2 can be connected to the diversion line 5 through the second outlet 22, allowing some of the refrigerant from the condenser 2 to flow to the diversion line 5. Thus, the refrigerant from the condenser 2 can flow to both the flash economizer 4 and the diversion line 5 at the same time. This improves the reliability of refrigerant diversion, effectively reduces the amount of refrigerant flowing to the flash economizer 4, thereby reducing the volume and size of the flash economizer 4, reducing the material usage of the flash economizer 4, reducing the installation and material costs of the flash economizer 4, and reducing the refrigerant charge, thus improving environmental value.

[0061] In some embodiments, the first outlet 21 and the second outlet 22 are both located at the bottom of the condenser 2, and the first outlet 21 and the second outlet 22 are respectively located on opposite sides of the condenser 2.

[0062] It should be noted that both the first outlet 21 and the second outlet 22 are used to discharge the liquid refrigerant after passing through the condenser 2. The first outlet 21 and the second outlet 22 are both located at the bottom of the condenser 2, allowing the liquid refrigerant to flow towards the first outlet 21 and the second outlet 22 under its own gravity. This facilitates the discharge of the liquid refrigerant after passing through the condenser 2 through the first outlet 21 and the second outlet 22, improving the convenience and reliability of refrigerant discharge. Furthermore, the first outlet 21 and the second outlet 22 are respectively located on opposite sides of the condenser 2. For example, the first outlet 21 and the second outlet 22 can be located on the front and rear sides or the left and right sides of the condenser 2, thus spacing them apart and creating a certain distance between them. This allows the first outlet 21 and the second outlet 22 to be connected to the liquid inlet 42 and the inlet end of the diversion pipe 5, respectively. It also avoids interference between the first outlet 21 and the second outlet 22, which could reduce the reliability of the connection between the condenser 2 and the flash economizer 4 and the diversion pipe 5.

[0063] In some embodiments, the flash economizer 4 is configured as a horizontal economizer or a vertical economizer.

[0064] The horizontal economizer has a lower height, which helps to reduce the space occupied by the refrigeration cycle system 100 in the vertical direction, while the vertical economizer has a smaller radial dimension, which helps to reduce the space occupied by the refrigeration cycle system 100 in the horizontal direction. Therefore, in actual design, the horizontal or vertical economizer can be selected according to the specific situation and space size, which can improve the flexibility of the installation.

[0065] When a horizontal economizer is selected, according to the refrigeration cycle system 100 of this application, the volume of the horizontal economizer can be reduced by setting up the branch pipe 5, thereby reducing installation and material costs. Figure 3 and Figure 4 As shown, the diameter of a conventional horizontal economizer can be set as D, and the diameter of the horizontal economizer that can be used in this application is D*f. D f D f is the cylinder diameter coefficient. D The value range is 0 to 1, meaning that the cylinder diameter of the horizontal economizer in this application is smaller than that of a conventional horizontal economizer, which can reduce the volume of the horizontal economizer, or, as... Figure 5 and Figure 6 As shown, the length of a conventional horizontal economizer can be set to L, and the length of the horizontal economizer that can be used in this application is L*f. L f L f is the length coefficient. L The value range is 0 to 1, meaning that the length of the horizontal economizer in this application is less than the length of the conventional horizontal economizer, which can reduce the volume of the horizontal economizer.

[0066] When a vertical economizer is selected, according to the refrigeration cycle system 100 of this application, the volume of the vertical economizer can be reduced by setting up the branch pipe 5, thereby reducing installation and material costs. Figure 7 As shown, the diameter of a conventional vertical economizer can be set as D, and the diameter of the vertical economizer that can be used in this application is D*f. D f D f is the cylinder diameter coefficient. D The value range is 0 to 1, meaning that the diameter of the vertical economizer in this application is smaller than that of a conventional vertical economizer, which can reduce the volume of the vertical economizer, or, as... Figure 8 As shown, the height of a conventional vertical economizer can be set to H, and the height of the vertical economizer that can be used in this application is H*f. H f H f is the height coefficient. H The value range is 0 to 1, meaning that the height of the vertical economizer in this application is less than that of the conventional vertical economizer, which can reduce the volume of the vertical economizer.

[0067] In some embodiments, the flash economizer 4 is further provided with a liquid baffle 48; and / or, a second control valve 45 is provided between the medium-pressure air supply port 41 and the compressor 1.

[0068] It should be noted that the flash economizer 4 is used for flashing and gas-liquid separation. A liquid-blocking mesh 48 is installed inside the flash economizer 4. The liquid-blocking mesh 48 can filter the liquid droplets in the two-phase refrigerant to achieve gas-liquid separation. That is, the flash economizer 4 can achieve gas-liquid separation through the liquid-blocking mesh 48, ensuring that the gaseous refrigerant entering the compressor 1 from the flash economizer 4 is as pure as possible, preventing liquid refrigerant from entering the compressor 1, thereby avoiding liquid slugging and other failures of the compressor 1, and protecting the safe operation of the compressor 1. In actual design, gas-liquid separation baffles can also be installed inside the flash economizer 4 to improve the reliability of gas-liquid separation of the two-phase refrigerant.

[0069] Furthermore, a second control valve 45 is provided between the medium-pressure gas supply port 41 and the compressor 1. The second control valve 45 can be set between the flash economizer 4 and the compressor 1 to control the gas supply from the flash economizer 4 to the compressor 1. The connection between the flash economizer 4 and the compressor 1 can be controlled by controlling the opening of the second control valve 45, thereby controlling the amount of refrigerant entering the compressor 1. For example, when there is a lot of medium-pressure gaseous refrigerant in the compressor 1, the opening of the second control valve 45 can be reduced, and when there is a little medium-pressure gaseous refrigerant in the compressor 1, the opening of the second control valve 45 can be increased to adapt to different needs of the compressor 1 and improve the efficiency of the compressor 1. The second control valve 45 can be an electric valve.

[0070] And, such as Figure 1As shown, a first pipe 6 is connected between the condenser 2 and the compressor 1. The first pipe 6 is used to allow the refrigerant from the condenser 2 to enter the compressor 1, exchange heat with the motor of the compressor 1 inside the compressor 1, cool the motor of the compressor 1, and improve the reliability of the compressor 1. A second pipe 7 is also connected between the compressor 1 and the evaporator 3. The second pipe 7 is used to allow the refrigerant after heat exchange with the motor of the compressor 1 to enter the evaporator 3, and then enter the refrigerant circuit. The refrigerant circuit includes a suction pipe 11, a discharge pipe 12, a primary throttling pipe 46, a secondary throttling pipe 47, a branch pipe 5, the first pipe 6, and the second pipe 7.

[0071] It should be noted that, according to the refrigeration cycle system 100 of this application, the cost of the flash economizer 4 is estimated to be reduced by 30% to 60%, and the refrigerant charge is estimated to be reduced by 10%, which can effectively improve environmental value while reducing costs.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A refrigeration cycle system, characterized in that, include: The compressor has a primary impeller and a secondary impeller inside; The compressor, the condenser, and the evaporator are connected in series to form a refrigerant circuit. A flash economizer is provided, which is connected between the condenser and the evaporator, and the flash economizer is provided with a medium-pressure air inlet, which is connected between the first-stage impeller and the second-stage impeller. A branch line is connected between the condenser and the evaporator, and the branch line is distributed in parallel with the flash economizer.

2. The refrigeration cycle system according to claim 1, characterized in that, A first control valve is provided between the flash economizer and the condenser; And / or, the diversion pipeline is equipped with a flow control valve.

3. The refrigeration cycle system according to claim 2, characterized in that, It also includes a liquid level detection element and a control element, wherein the liquid level detection element is disposed on the flash economizer and is used to detect the liquid level height inside the flash economizer; The first control valve, the flow control valve, and the liquid level detection element are all electrically connected to the control element, which controls the first control valve and the flow control valve according to the liquid level height.

4. The refrigeration cycle system according to claim 1, characterized in that, The outlet end of the diversion pipeline is connected between the flash economizer and the evaporator.

5. The refrigeration cycle system according to claim 4, characterized in that, A primary throttling pipeline connects the condenser and the flash economizer, and a secondary throttling pipeline connects the flash economizer and the evaporator. The outlet end of the branch pipeline is connected to the secondary throttling pipeline.

6. The refrigeration cycle system according to claim 5, characterized in that, The primary throttling pipeline is equipped with a first orifice plate; And / or, the secondary throttling pipeline is provided with a second orifice plate, and the outlet end of the diversion pipeline is connected between the flash economizer and the second orifice plate.

7. The refrigeration cycle system according to claim 1, characterized in that, The flash evaporator is provided with an inlet and an outlet, and the condenser is provided with a first outlet and a second outlet. The inlet is connected to the first outlet, and the second outlet is connected to the inlet end of the diversion pipeline.

8. The refrigeration cycle system according to claim 7, characterized in that, Both the first outlet and the second outlet are located at the bottom of the condenser, and the first outlet and the second outlet are respectively located on opposite sides of the condenser.

9. The refrigeration cycle system according to claim 7, characterized in that, The flash economizer is constructed as a horizontal economizer or a vertical economizer.

10. The refrigeration cycle system according to claim 1, characterized in that, The flash-type economizer is also equipped with a liquid-blocking screen. And / or, a second control valve is provided between the medium-pressure air supply port and the compressor.

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