A water chiller

Abstract

The utility model discloses a water chilling unit, including compressor, condenser, evaporimeter, liquefied heat exchanger, the compressor includes first cooling device, motor, the first cooling device is used for the motor cooling heat dissipation, including first port, second port, is used respectively for input condensed refrigerant, and exports the refrigerant after cooling, the liquefied heat exchanger includes refrigerant passage, heat transfer medium channel, the refrigerant passage includes third port, fourth port, its respectively with second port, evaporimeter is connected, and the refrigerant after cooling is cooled liquefaction and returns evaporimeter, the heat transfer medium channel includes fifth port, sixth port, its respectively with the heat transfer medium inlet of evaporimeter, heat transfer medium outlet is connected, the utility model discloses the refrigerant after cooling is condensed liquefaction as liquid state and is delivered to evaporimeter, prevents the refrigerant after cooling and influences evaporimeter's heat exchange efficiency and compressor suction liquid, improves heat exchange efficiency and protects compressor, prolongs compressor life.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically to a chiller unit. Background Technology

[0002] Currently, some chiller units use refrigerant to cool the motors and frequency converters. Refrigerant cooling is generally achieved by using the pressure difference between the condenser and evaporator as the driving force. Liquid is drawn from the pipes behind the condenser to cool the compressor motor and frequency converter. After cooling the motor and frequency converter, the refrigerant returns to the evaporator.

[0003] The heat generated by the motor and frequency converter changes continuously with the unit's operating conditions and the status of the heat exchanger. The liquid refrigerant used for cooling cannot guarantee sufficient heat exchange and will completely vaporize. Generally, the refrigerant in the cooling return gas is in a gas-liquid mixed state. If the cooling return gas returns to the top of the evaporator shell, it will be sucked into the compressor inlet along with the compressor suction gas, causing liquid to be carried into the suction gas. In severe cases, this can damage the compressor impeller and lead to serious consequences. If the cooling return gas returns to the bottom of the evaporator, the refrigerant gas in the gas-liquid mixed refrigerant will occupy a large amount of the heat exchange space of the heat exchange tubes, resulting in a reduction in heat exchange efficiency.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] To address the problem mentioned in the background art of refrigerant returning to the evaporator in chiller units, which causes liquid carry-in in the compressor suction or affects heat exchange efficiency, this utility model proposes to add a liquefaction heat exchanger to the chiller unit. This allows the cooled refrigerant to exchange heat with the refrigerant in the evaporator, liquefy, and then return to the evaporator. This solves the problem of liquid carry-in in the compressor suction and the impact on evaporator heat exchange efficiency, improves heat exchange efficiency and compressor life, and enhances the stability, reliability, and safety of system operation.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0007] A water chiller unit includes a compressor, a condenser, an evaporator, and a liquefaction heat exchanger;

[0008] The compressor includes a first cooling device and a motor; the first cooling device is used to cool and dissipate heat from the motor, and includes a first port and a second port, which are used to input condensing refrigerant and output cooled refrigerant, respectively; the first port is connected to the condenser.

[0009] The liquefaction heat exchanger includes a refrigerant channel and a refrigerant channel; the refrigerant channel includes a third port and a fourth port, which are respectively connected to the second port and the evaporator, and the cooled refrigerant is liquefied and returned to the evaporator; the refrigerant channel includes a fifth port and a sixth port, which are respectively connected to the refrigerant inlet and refrigerant outlet of the evaporator.

[0010] This utility model of a chiller unit, by setting up a liquefaction heat exchanger, recondenses and liquefies the refrigerant used for cooling the compressor into liquid refrigerant, which is then transported to the evaporator for evaporative cooling. This solves the problem of reduced heat exchange efficiency caused by the gas-liquid mixture of the cooled refrigerant entering the evaporator and occupying the heat exchange area, as well as the problem of liquid being carried into the compressor suction channel by the cooled refrigerant directly returning to the compressor suction channel. This improves the heat exchange efficiency of the evaporator, protects the compressor, and extends the compressor's lifespan. At the same time, it enhances the stability, reliability, and safety of the chiller unit system.

[0011] In some specific embodiments, a drying filter is also included; the first port is connected to the condenser through the drying filter to dry and filter the condensed refrigerant entering the first cooling device.

[0012] The chiller unit in this embodiment improves the heat exchange efficiency of the first cooling device and the cooling efficiency of the compressor, protects the compressor, improves the stability of the chiller unit system operation, and extends the life of the compressor.

[0013] In some specific embodiments, the lower part of the condenser is provided with a first outlet, which is connected to the first port through the drying filter.

[0014] In this embodiment, the refrigerant output from the chiller unit to the first cooling device is drawn from the lower part of the condenser, ensuring the liquid state of the refrigerant and thus ensuring the subcooling of the refrigerant delivered to the first cooling device, thereby improving the cooling efficiency and effect of the first cooling device.

[0015] In some specific embodiments, a water pump and a flow regulating valve are also included; the water pump is located near the refrigerant inlet; the flow regulating valve is located on the pipeline between the refrigerant inlet and the fifth port.

[0016] In this embodiment, the chiller unit adjusts the flow rate of the refrigerant entering the liquefaction heat exchanger and the flow rate of the refrigerant flowing into the refrigerant outlet by installing a flow regulating valve on the pipeline between the refrigerant inlet and the fifth port. This ensures that the liquefaction heat exchanger liquefies the cooled refrigerant and maintains the temperature of the refrigerant, thus guaranteeing the cooling effect.

[0017] In some specific embodiments, a water pump and a flow regulating valve are also included; the water pump is located near the refrigerant outlet and connected to the refrigerant outlet; the sixth port is connected to the pipeline after the water pump; and the flow regulating valve is located on the pipeline between the sixth port and the water pump.

[0018] In this embodiment, the chiller unit adjusts the flow rate of the refrigerant entering the liquefaction heat exchanger by installing a flow regulating valve on the pipeline between the water pump and the sixth port, thereby ensuring that the liquefaction heat exchanger liquefies the cooled refrigerant.

[0019] In some specific embodiments, a temperature detection unit and a pressure detection unit are also included, which are respectively installed on the pipeline between the fourth port and the evaporator, for monitoring the temperature and pressure of the cooled refrigerant entering the evaporator.

[0020] In this embodiment, the chiller unit uses a temperature detection unit and a pressure detection unit to detect the temperature and pressure of the refrigerant output from the liquefaction heat exchanger, thereby monitoring its liquefaction status and liquefaction rate.

[0021] In some specific embodiments, a frequency converter and a second cooling device are also included;

[0022] The frequency converter is connected to the compressor and is used to control the compressor;

[0023] The second cooling device is connected to the frequency converter and is used to cool and dissipate heat from the frequency converter. It includes a seventh port and an eighth port. A second outlet is provided at the bottom of the condenser and is connected to the seventh port. The eighth port is connected to the third port through a pipeline.

[0024] In this embodiment, the chiller unit uses a second cooling device to cool the inverter and dissipate heat. The cooled refrigerant output from the second cooling device is then output together with the cooled refrigerant output from the first cooling device to a liquefaction heat exchanger. The liquefaction heat exchanger liquefies the gas-liquid mixture of cooled refrigerant into a liquid state and outputs it to the evaporator for re-evaporation and heat dissipation, thereby improving the heat exchange efficiency of the evaporator. This prevents liquid from being carried into the compressor intake, thus protecting the compressor and extending its lifespan.

[0025] In some specific embodiments, an economizer is also included, which includes a liquid inlet, a liquid outlet, and a gas supply port;

[0026] The condenser is also provided with a third outlet at the bottom, which is connected to the liquid inlet; the liquid outlet is connected to the evaporator; and the gas supply port is connected to the compressor.

[0027] The chiller unit in this embodiment improves cooling efficiency and cooling capacity by incorporating an economizer.

[0028] In some specific embodiments, the liquefaction heat exchanger is a plate heat exchanger;

[0029] The bottom of the evaporator is provided with a fourth outlet, which is connected to the liquid outlet and the fourth port respectively.

[0030] The chiller unit in this embodiment improves heat exchange efficiency by setting the liquefaction heat exchanger to a plate heat exchanger; by setting a fourth outlet at the bottom of the evaporator and connecting it to the liquid outlet and the fourth port, the liquid refrigerant output by the liquefaction heat exchanger returns to the bottom of the evaporator and evaporates and exchanges heat during the rising process, thereby improving heat exchange efficiency.

[0031] A water chiller unit includes a compressor, a condenser, and an evaporator, which are connected by pipelines to form a refrigeration cycle system; it also includes a frequency converter, a second cooling device, and a liquefaction heat exchanger.

[0032] The frequency converter is connected to the compressor and is used to control the compressor;

[0033] The second cooling device is connected to the frequency converter and is used to cool and dissipate heat from the frequency converter. It includes a seventh port and an eighth port, which are used to input condensing refrigerant and output cooled refrigerant, respectively. The seventh port is connected to the condenser.

[0034] The liquefaction heat exchanger includes a refrigerant channel and a refrigerant channel; the refrigerant channel includes a third port and a fourth port, which are respectively connected to the seventh port and the evaporator, and the cooled refrigerant is liquefied and returned to the evaporator; the refrigerant channel includes a fifth port and a sixth port, which are respectively connected to the refrigerant inlet and refrigerant outlet of the evaporator.

[0035] In this embodiment, the chiller unit uses a second cooling device to cool and dissipate heat from the frequency converter. After cooling, the refrigerant is liquefied through a liquefaction heat exchanger and then returned to the evaporator for evaporation and refrigeration, thereby improving the heat exchange efficiency of the evaporator. This prevents the refrigerant from directly returning to the compressor suction port, which would cause liquid to be carried into the compressor suction, thus protecting the compressor and extending its lifespan.

[0036] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the composition and connection structure of the chiller unit system according to an embodiment;

[0039] Figure 2 This is a schematic diagram of the composition and connection structure of the chiller unit system according to an embodiment;

[0040] Figure 3 This is a schematic diagram of the composition and connection structure of the chiller unit system according to an embodiment;

[0041] Figure 4 This is a schematic diagram of the composition and connection structure of the chiller unit system according to an embodiment;

[0042] Figure 5 This is a schematic diagram of the composition and connection structure of the chiller unit system according to an embodiment;

[0043] Figure 6 This is a schematic diagram of the composition and connection structure of the chiller unit system according to an embodiment;

[0044] Figure 7 This is a schematic diagram of the connection of the control components according to an embodiment;

[0045] Figure 8 This is a schematic diagram of the composition and connection structure of the chiller unit system according to an embodiment;

[0046] Figure 9 This is a schematic diagram of the composition and connection structure of the chiller unit system according to an embodiment;

[0047] Figure 10 This is a schematic diagram of the composition and connection structure of a chiller unit system according to an embodiment.

[0048] Figure label,

[0049] 1. Compressor; 2. Condenser; 21. First outlet; 22. Second outlet; 23. Third outlet; 24. Multi-port valve; 3. Evaporator; 31. Refrigerant outlet; 32. Refrigerant inlet; 33. Fourth outlet; 4. First cooling unit; 41. First port; 42. Second port; 5. Liquefaction heat exchanger; 51. Refrigerant passage; 52. Refrigerant passage; 53. Third port; 54. Fourth port; 55. Fifth port; 56. Sixth port; 6. Dryer filter; 7. Flow regulating valve; 8. Economizer; 81. Liquid inlet; 82. Liquid outlet; 83. Gas inlet; 9. Second cooling unit; 91. Seventh port; 92. Eighth port; 10. Temperature detection unit; 20. Pressure detection unit; 30. Frequency converter; 40. Controller; 50. Water pump. Detailed Implementation

[0050] 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, and 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.

[0051] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 application 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. Therefore, they should not be construed as limitations on this application.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. 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 the invention. 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. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0056] Air conditioners execute a refrigeration cycle using a compressor, condenser, throttling device, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0057] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released into the surrounding environment or into the coolant through the condensation process.

[0058] The throttling device reduces the high-temperature, high-pressure liquid refrigerant that condenses in the condenser to a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant throttled in the throttling device and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled.

[0059] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 The chiller unit of this utility model is an air conditioner with a special structure and special function; that is, the chiller unit includes a two-stage compression compressor 1, a condenser 2 and an evaporator 3 that exchange heat with the refrigerant respectively; the compressor 1, condenser 2 and evaporator 3 are connected by pipelines to form a refrigeration cycle system to provide cooling capacity to the indoor space or the refrigerant; the refrigeration cycle system applies energy to the refrigerant vapor through the compressor 1, causing its pressure and temperature to rise, and after condensation and throttling, it becomes a low-pressure liquid refrigerant. The low-pressure refrigerant liquid evaporates in the evaporator 3, and at the same time absorbs heat from the surrounding environment (refrigerant, such as water) to lower the temperature of the refrigerant, thereby achieving the purpose of cooling.

[0060] The compressor 1 includes a first cooling device 4 and a motor; the first cooling device 4 is used to cool and dissipate heat for the motor of the compressor 1; the first cooling device 4 includes a first port 41 and a second port 42; the first port 41 is connected to the condenser 2 and is used to input the condensing refrigerant into the first cooling device 4; the second port 42 is used to output the cooled refrigerant; the condensing refrigerant is a liquid refrigerant that has been condensed, cooled, and depressurized by the condenser 2; the cooled refrigerant is a refrigerant that has absorbed heat by the first cooling device 4 to cool and dissipate heat for the compressor 1 and is in a gaseous or gas-liquid mixed state.

[0061] The chiller unit also includes a liquefaction heat exchanger 5, which includes a refrigerant passage 51 and a refrigerant channel 52, used to realize heat exchange between the refrigerant passing through the refrigerant passage 51 and the refrigerant passing through the refrigerant channel 52; the refrigerant passage 51 includes a third port 53 and a fourth port 54, which are respectively connected to the second port 42 and the evaporator 3; the refrigerant channel 52 includes a fifth port 55 and a sixth port 56, which are respectively connected to the refrigerant inlet 32 ​​and the refrigerant outlet 31 of the evaporator 3; the refrigerant passing through the refrigerant channel 52 cools and liquefies the refrigerant that has been cooled by the refrigerant passage 51 and then delivers it to the evaporator 3.

[0062] This utility model's chiller unit, by incorporating a liquefaction heat exchanger 5, re-condenses and liquefies the refrigerant used for cooling the compressor 1's motor, then transports it to the evaporator 3 for evaporative cooling. This solves the problems of reduced heat exchange efficiency caused by the gas-liquid mixture of the cooled refrigerant entering the evaporator 3 and occupying heat exchange area, as well as the problem of liquid being carried into the compressor 1's suction port by the cooled refrigerant returning directly to the compressor 1's suction port after passing through the evaporator 3. This improves the heat exchange efficiency of the evaporator 3, protects the compressor 1, and extends its lifespan. Simultaneously, it enhances the stability, reliability, and safety of the chiller unit system.

[0063] The specific structure and principle of the chiller unit of this utility model will be described in detail below through specific embodiments.

[0064] In some specific embodiments, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 The chiller unit also includes a dryer filter 6, which is used to filter and dry the refrigerant passing through it.

[0065] The first port 41 is connected to the condenser 2 through the dryer filter 6 to dry and filter the condensed refrigerant entering the first cooling device 4, thereby improving the dryness and quality of the condensed refrigerant entering the first cooling device 4, improving the evaporation efficiency of the refrigerant in the first cooling device 4, and thus improving the cooling efficiency of the first cooling device 4 for the compressor 1.

[0066] The chiller unit of this embodiment improves the heat exchange efficiency of the first cooling device 4 and the cooling efficiency of the compressor 1, protects the compressor 1, improves the stability of the chiller unit system operation, and extends the life of the compressor 1.

[0067] In some specific embodiments, refer to Figure 2 , Figure 3 Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 A first outlet 21 is provided at the lower part of the condenser 2, which is connected to the first port 41 through a dryer filter 6.

[0068] That is, the first outlet 21 is located at the lower part of the condenser 2; the two ends of the dryer filter 6 are connected to the first outlet 21 and the first port 41 respectively.

[0069] In this embodiment, the condensing refrigerant output from the chiller unit to the first cooling device 4 is drawn out from the lower part of the condenser 2, ensuring the liquid state of the condensing refrigerant, thereby ensuring the subcooling degree of the condensing refrigerant delivered to the first cooling device 4 and improving the cooling efficiency and effect of the first cooling device 4 on the compressor 1.

[0070] In some specific embodiments, refer to Figure 4 , Figure 6 , Figure 9 The chiller unit also includes a water pump 50 and a flow regulating valve 7. The water pump 50 is located on the main pipeline near the refrigerant inlet 32 ​​to provide power for the flow of refrigerant in the evaporator 3 and for the refrigerant entering the liquefaction heat exchanger 5. The flow regulating valve 7 is located on the pipeline between the refrigerant inlet 32 ​​and the fifth port 55 to regulate the flow rate of the refrigerant entering the liquefaction heat exchanger 5 and the refrigerant flowing into the refrigerant outlet 31.

[0071] In this embodiment, the chiller unit adjusts the flow rate of the refrigerant entering the liquefaction heat exchanger 5 and the flow rate of the refrigerant flowing into the refrigerant outlet 31 by installing a flow regulating valve 7 on the pipeline between the refrigerant inlet 32 ​​and the fifth port 55. This ensures that the liquefaction heat exchanger 5 can liquefy the cooled refrigerant and maintain the temperature of the cooling refrigerant, thus ensuring the cooling effect.

[0072] In some specific embodiments, refer to Figure 5 The chiller unit also includes a water pump 50 and a flow regulating valve 7. The water pump 50 is located on the main pipeline near the refrigerant outlet 31 to provide power for the flow of refrigerant in the evaporator 3. The flow regulating valve 7 is located on the pipeline between the water pump 50 and the sixth port 56 to regulate the flow rate of the refrigerant entering the liquefaction heat exchanger 5.

[0073] That is, the refrigerant outlet 31 is connected to one port of the water pump 50; the flow regulating valve 7 is installed on the pipeline between the other port of the water pump 50 and the sixth port 56; the water pump 50 provides flow power for the refrigerant entering the liquefaction heat exchanger 5; the flow regulating valve 7 regulates the flow rate of the refrigerant entering the liquefaction heat exchanger 5.

[0074] In this embodiment, the chiller unit adjusts the flow rate of the refrigerant entering the liquefaction heat exchanger 5 by installing a flow regulating valve 7 on the pipeline between the water pump 50 and the sixth port 56, thereby ensuring that the liquefaction heat exchanger 5 liquefies the cooled refrigerant.

[0075] In some specific embodiments, refer to Figure 6 , Figure 9 The chiller unit also includes a temperature detection unit 10 and a pressure detection unit 20, which are respectively located between the fourth port 54 and the evaporator 3, and are used to monitor the temperature and pressure of the refrigerant entering the evaporator 3 from the liquefaction heat exchanger 5.

[0076] In this embodiment, the chiller unit uses temperature detection unit 10 and pressure detection unit 20 to detect the temperature and pressure of the refrigerant output from liquefaction heat exchanger 5, and monitors its liquefaction status and liquefaction rate.

[0077] In some specific embodiments, refer to Figure 6 , Figure 9 It also includes a controller 40, which is connected to the temperature detection unit 10 and the pressure detection unit 20. It receives the refrigerant temperature detected by the temperature detection unit 10 and the refrigerant pressure detected by the pressure detection unit 20, and calculates the subcooling of the refrigerant output by the liquefaction heat exchanger 5 based on the received refrigerant temperature and refrigerant pressure. It also adjusts the flow rate of the flow regulating valve 7 by adjusting the subcooling to ensure the subcooling of the refrigerant output by the liquefaction heat exchanger 5.

[0078] In some specific embodiments, refer to Figure 7 The chiller unit also includes a frequency converter 30; the frequency converter 30 is connected to the controller 40 and the compressor 1 respectively, and performs frequency conversion control on the compressor 1.

[0079] In some specific embodiments, refer to Figure 8 , Figure 9 , Figure 10 The chiller unit also includes a second cooling device 9, which is connected to the frequency converter 30 and is used to cool and dissipate heat from the frequency converter 30; the second cooling device 9 includes a seventh port 91 and an eighth port 92; a second outlet 22 is provided at the lower part of the condenser 2, which is connected to the seventh port 91; the eighth port 92 is connected to the third port 53 through a pipeline.

[0080] In this embodiment, the chiller unit uses a second cooling device 9 to cool and dissipate heat from the inverter 30. The cooled refrigerant output from the second cooling device 9 is then output together with the cooled refrigerant output from the first cooling device 4 to the liquefaction heat exchanger 5. The liquefaction heat exchanger 5 liquefies the gas-liquid mixture of cooled refrigerant into a liquid state and outputs it to the evaporator 3 for renewed evaporation and heat dissipation, thereby improving the heat exchange efficiency of the evaporator 3. This prevents the refrigerant from directly returning to the suction port of the compressor 1, which would cause liquid to be carried into the compressor 1's suction, thus protecting the compressor 1 and extending its lifespan.

[0081] In some specific embodiments, refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 10 The chiller unit also includes an economizer 8, which includes a liquid inlet 81, a liquid outlet 82, and an air supply port 83.

[0082] The bottom of the condenser 2 is also provided with a third outlet 23, which is connected to the liquid inlet 81; the liquid outlet 82 is connected to the evaporator 3; and the gas supply port 83 is connected to the compressor 1.

[0083] Specifically, the chiller unit also includes an economizer 8; the compressor 1 adjusts the amount of refrigerant entering the compressor 1 by adjusting the frequency and the opening of the inlet guide vanes. The low-temperature, low-pressure gaseous refrigerant evaporated from the evaporator 3 is compressed by the first-stage impeller of the compressor 1, then mixed with the medium-temperature, medium-pressure saturated gas from the economizer 8 and further compressed by the second-stage impeller, becoming a high-temperature, high-pressure gaseous refrigerant. This gaseous refrigerant then enters the condenser 2, where it is cooled by the cooling water and transformed into a high-temperature, high-pressure liquid refrigerant. The high-temperature, high-pressure liquid refrigerant, after being depressurized by the first-stage throttling process, enters the economizer 8, where it is separated into saturated liquid refrigerant and flashing gaseous refrigerant. The gaseous refrigerant enters the second-stage impeller of the compressor 1 through the make-up gas line for further compression; the liquid refrigerant, after being depressurized by the second-stage throttling process, becomes a low-temperature, low-pressure liquid refrigerant and enters the evaporator 3, forming the main circulation loop.

[0084] The chiller unit in this embodiment improves cooling efficiency and cooling capacity by setting up an economizer 8.

[0085] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 10 The liquefaction heat exchanger 5 is a plate heat exchanger.

[0086] The bottom of the evaporator 3 is provided with a fourth outlet 33, which is connected to the liquid outlet 82 and the fourth port 54 respectively.

[0087] In this embodiment, the chiller unit improves heat exchange efficiency by setting the liquefaction heat exchanger 5 as a plate heat exchanger; by setting a fourth outlet 33 at the bottom of the evaporator 3 and connecting it to the liquid outlet 82 and the fourth port 54, the liquid refrigerant output by the liquefaction heat exchanger 5 returns to the bottom of the evaporator 3 and evaporates and exchanges heat during the rising process, thereby improving heat exchange efficiency.

[0088] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 The chiller unit also includes a multi-port valve 24, which is a multi-port charging valve with one inlet and multiple outlets; the inlet is connected to the bottom of the condenser 2; the first outlet 21 and the third outlet 23 are different outlets of the multi-port valve 24.

[0089] Reference Figure 10 This utility model also discloses a water chiller unit, which includes a compressor 1, a condenser 2, and an evaporator 3; the compressor 1, condenser 2, and evaporator 3 are connected by pipelines to form a refrigeration cycle system.

[0090] The chiller unit also includes a frequency converter 30 and a second cooling device 9; the frequency converter 30 is connected to the compressor 1 and controls and drives the compressor 1 to operate at a frequency conversion rate; the second cooling device 9 is connected to the frequency converter 30 and is used to cool and dissipate heat from the frequency converter 30; the second cooling device 9 includes a seventh port 91 and an eighth port 92, which are used to input condensing refrigerant and output cooled refrigerant, respectively.

[0091] The chiller unit also includes a liquefaction heat exchanger 5, which includes a refrigerant passage 51 and a refrigerant channel 52. The refrigerant passage 51 includes a third port 53 and a fourth port 54, which are respectively connected to the eighth port 92 and the fourth outlet 33 at the bottom of the evaporator 3, and return the cooled refrigerant to the evaporator 3 after cooling and liquefaction. The refrigerant channel 52 includes a fifth port 55 and a sixth port 56, which are respectively connected to the refrigerant inlet 32 ​​and the refrigerant outlet 31 of the evaporator 3.

[0092] In this embodiment, the chiller unit uses a second cooling device 9 to cool and dissipate heat from the inverter 30. After cooling, the refrigerant is liquefied by the liquefaction heat exchanger 5 and then returned to the evaporator 3 for evaporation and cooling, thereby improving the heat exchange efficiency of the evaporator 3. This prevents the refrigerant from directly returning to the suction port of the compressor 1, which would cause the compressor 1 to carry liquid in its suction, thus protecting the compressor 1 and extending its lifespan.

[0093] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0094] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A water chiller unit, characterized in that, This includes compressors, condensers, evaporators, and liquefaction heat exchangers; The compressor includes a first cooling device and a motor; the first cooling device is used to cool and dissipate heat from the motor, and includes a first port and a second port, which are used to input condensing refrigerant and output cooled refrigerant, respectively; the first port is connected to the condenser. The liquefaction heat exchanger includes a refrigerant channel and a refrigerant channel; the refrigerant channel includes a third port and a fourth port, which are respectively connected to the second port and the evaporator, and the cooled refrigerant is liquefied and returned to the evaporator; the refrigerant channel includes a fifth port and a sixth port, which are respectively connected to the refrigerant inlet and refrigerant outlet of the evaporator.

2. The chiller unit according to claim 1, characterized in that, It also includes a drying filter; the first port is connected to the condenser through the drying filter to dry and filter the condensed refrigerant entering the first cooling device.

3. The chiller unit according to claim 2, characterized in that, The lower part of the condenser is provided with a first outlet, which is connected to the first port through the dryer filter.

4. The chiller unit according to claim 1, characterized in that, It also includes a water pump and a flow regulating valve; the water pump is located near the refrigerant inlet; the flow regulating valve is located on the pipeline between the refrigerant inlet and the fifth port.

5. The chiller unit according to claim 1, characterized in that, It also includes a water pump and a flow regulating valve; the water pump is located near the outlet of the refrigerant and is connected to the outlet of the refrigerant; the sixth port is connected to the pipeline after the water pump; the flow regulating valve is located on the pipeline between the sixth port and the water pump.

6. The chiller unit according to claim 1, characterized in that, It also includes a temperature detection unit and a pressure detection unit, which are respectively installed on the pipeline between the fourth port and the evaporator, for monitoring the temperature and pressure of the cooled refrigerant entering the evaporator.

7. The chiller unit according to any one of claims 2 to 4, characterized in that, It also includes frequency converters and a second cooling device; The frequency converter is connected to the compressor and is used to control the compressor; The second cooling device is connected to the frequency converter and is used to cool and dissipate heat from the frequency converter. It includes a seventh port and an eighth port. A second outlet is provided at the bottom of the condenser and is connected to the seventh port. The eighth port is connected to the third port through a pipeline.

8. The chiller unit according to any one of claims 1 to 7, characterized in that, It also includes an economizer, which includes a liquid inlet, a liquid outlet, and a gas inlet; The condenser is also provided with a third outlet at the bottom, which is connected to the liquid inlet; the liquid outlet is connected to the evaporator; and the gas supply port is connected to the compressor.

9. The chiller unit according to claim 8, characterized in that, The liquefaction heat exchanger is a plate heat exchanger. The bottom of the evaporator is provided with a fourth outlet, which is connected to the liquid outlet and the fourth port respectively.

10. A chiller unit, comprising a compressor, a condenser, and an evaporator, connected by pipelines to form a refrigeration cycle system; characterized in that, Also includes: A frequency converter, which is connected to the compressor, is used to control the compressor; The second cooling device, which is connected to the frequency converter, is used to cool and dissipate heat from the frequency converter. It includes a seventh port and an eighth port, which are used to input condensing refrigerant and output cooled refrigerant, respectively. The seventh port is connected to the condenser. A liquefaction heat exchanger includes a refrigerant channel and a refrigerant channel; the refrigerant channel includes a third port and a fourth port, which are respectively connected to the seventh port and the evaporator, and the cooled refrigerant is liquefied and returned to the evaporator; the refrigerant channel includes a fifth port and a sixth port, which are respectively connected to the refrigerant inlet and refrigerant outlet of the evaporator.

Images