A flooded screw refrigeration unit

Abstract

The present invention relates to the technical field of refrigeration units, and provides a flooded screw refrigeration unit, which includes a flooded screw refrigeration unit, including a condenser, on which a control cabinet is installed, a screw compressor is arranged on the side of the condenser, and further includes a housing, an oil separation component and a heat exchange component. The housing is installed on the side of the condenser, the screw compressor is installed on the top of the housing, a communication cavity and a heat exchange cavity are arranged inside the housing, the input end of the screw compressor is communicated with the housing, an expansion valve is communicated between the condenser and the housing through a pipeline, the oil separation component is installed on the condenser, the oil separation component is communicated with the output end of the screw compressor, and the heat exchange component is installed inside the housing. Through the above technical solution, the problem in the prior art that in a high-humidity environment, it is difficult for the oil separator to maintain efficient separation of lubricating oil, resulting in part of the lubricating oil entering the condenser and the evaporator, affecting the normal heat exchange, is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration units, and more specifically, to a flooded screw refrigeration unit. Background Art

[0002] A flooded refrigeration unit is a common refrigeration device, whose main function is to provide cooling capacity for regulating and controlling the temperature of various industrial and commercial facilities. It transfers heat from the area to be cooled to the outside through the evaporation and heat absorption process of the refrigerant, thereby achieving the refrigeration effect. It is commonly used in large air conditioning systems, food processing, pharmaceutical refrigeration, chemical cooling and other fields that require large-scale refrigeration demand, and has a high energy efficiency ratio and reliability.

[0003] The refrigeration unit mainly consists of a compressor, a condenser, an evaporator, an expansion valve and system pipelines. When the compressor operates, the moving parts inside the compressor require lubricating oil (such as mineral oil, synthetic oil) to reduce friction and dissipate heat. During the continuous operation, part of the lubricating oil will be discharged with the compressed high-temperature and high-pressure refrigerant gas in the form of tiny oil droplets and enter the refrigeration cycle system. If it is not processed, as the lubricating oil increases continuously, the oil film will cover the surface of the heat transfer tube, forming a thermal resistance, thereby inhibiting the boiling heat transfer of the refrigerant, increasing the refrigerant flow resistance, reducing the refrigerant flow rate in the evaporator, and further aggravating the problem of uneven temperature distribution, greatly affecting the reliability and stability of the refrigeration unit operation.

[0004] To ensure the normal operation of the refrigeration unit, an oil separator is generally set between the compressor and the condenser to collect the lubricating oil. Due to the limited ability of the oil separator to separate tiny oil mists, it is still difficult to avoid the lubricating oil entering the condenser and the evaporator. Even if a high-efficiency oil separator (such as a centrifugal type) is used, part of the lubricating oil will still enter the condenser and the evaporator. Long-term accumulation will still affect the heat transfer efficiency. Especially when used in a high-humidity environment, the separation efficiency of the lubricating oil decreases significantly after moisture absorption and emulsification, affecting the use effect. Summary of the Invention

[0005] The present invention provides a flooded screw refrigeration unit to solve the problem in the prior art that in a high-humidity environment, it is difficult for the oil separator to maintain high-efficiency separation of lubricating oil, resulting in part of the lubricating oil entering the condenser and the evaporator, affecting the normal heat transfer.

[0006] The technical solution of the present invention is as follows:

[0007] A flooded screw refrigeration unit includes a condenser, on which a control cabinet is installed. A screw compressor is also provided on the side of the condenser. It further includes a housing, an oil separation component and a heat exchange component. The housing is installed on the side of the condenser, and the screw compressor is installed on the top of the housing. Communication cavities are respectively arranged at both ends inside the housing, and a heat exchange cavity is arranged between the two communication cavities. Among them, the input end of the screw compressor is communicated with the housing, and an expansion valve is communicated between the condenser and the housing through a pipeline. The oil separation component is installed on the condenser and is communicated with the output end of the screw compressor for separating and collecting the lubricating oil in the gaseous refrigerant and then discharging it. The heat exchange component is installed inside the housing and is located inside the heat exchange cavity for transferring the heat of the medium to be cooled to the refrigerant.

[0008] On the basis of the foregoing solution, the oil separation component includes an installation housing, a collection cylinder, a discharge pipe, a separation part and an extrusion part. The installation housing is fixedly installed on the condenser, the collection cylinder is coaxially and fixedly installed on the inner bottom wall of the installation housing, the collection cylinder is communicated with the output end of the screw compressor through a communication pipe, the discharge pipe is communicated between the installation housing and the input end of the condenser, the separation part is installed on the collection cylinder for separating the refrigerant and the lubricating oil, and the extrusion part is installed on the installation housing for collecting the separated lubricating oil.

[0009] On the basis of the foregoing solution, in order to separate the lubricating oil in the refrigerant, the separation part includes a conical frame, a partition board, a through groove and an oil-absorbing sponge block. The conical frame is coaxially and fixedly installed on the collection cylinder, there is a gap between the conical frame and the inner wall of the installation housing, a plurality of the partition boards are fixedly installed on the conical frame at equal angles, the partition boards are fixedly connected with the collection cylinder, a plurality of the through grooves are arranged on the collection cylinder at equal angles, the plurality of the partition boards and the plurality of the through grooves are arranged staggeredly, and an oil-absorbing sponge block for separating the lubricating oil is arranged between every two partition boards.

[0010] On the basis of the foregoing solution, in order to collect the separated lubricating oil, the oil-absorbing sponge block needs to be extruded. The extrusion part includes an extrusion frame and a driving part. The extrusion frame is slidably installed between every two partition boards, the inner side of the extrusion frame is slidably abutted against the outer circle of the collection cylinder, a plurality of the driving parts are fixedly installed on the top of the installation housing in a circumferential and equiangular manner, and the output end of the driving part is fixedly connected with the extrusion frame.

[0011] On the basis of the foregoing solution, the oil-absorbing sponge blocks are respectively in sliding abutment with the partition plates on both sides. Both the upper and lower ends of the oil-absorbing sponge are provided in an inclined shape. The bottom of the oil-absorbing sponge block is adapted to the conical frame, and the top of the oil-absorbing sponge block is adapted to the bottom of the extrusion frame. During the operation of the device, when the extrusion frame extrudes the oil-absorbing sponge block, the lubricating oil absorbed in the oil-absorbing sponge block will flow into the bottom of the installation housing.

[0012] On the basis of the foregoing solution, the heat exchange assembly includes heat exchange tubes, first straight grooves, second straight grooves and a mounting plate. A plurality of the heat exchange tubes are fixedly installed inside the outer shell. The heat exchange tubes are located in the heat exchange chamber. Two ends of the heat exchange tubes are respectively communicated with the communication chambers at two ends of the heat exchange chamber. A plurality of the first straight grooves are circumferentially and equiangularly formed on the inner wall of the heat exchange tube. A plurality of the second straight grooves are circumferentially and equiangularly formed on the outer wall of the heat exchange tube. The plurality of the second straight grooves and the plurality of the first straight grooves are arranged staggeredly. Among them, there is a toothed transition region between the plurality of the first straight grooves and the plurality of the second straight grooves. The mounting plate is fixedly installed inside one of the communication chambers. The mounting plate divides this communication chamber into a liquid inlet area and a liquid outlet area. An outlet and an inlet are provided at one end of the outer shell. The outlet is communicated with the liquid outlet area, and the inlet is communicated with the liquid inlet area.

[0013] The working principle and beneficial effects of the present invention are as follows:

[0014] 1. In the present invention, the gaseous refrigerant entering the collection cylinder will be discharged through the through groove. During this process, it will pass through the oil-absorbing sponge block. The gaseous refrigerant can pass through the oil-absorbing sponge block, but the lubricating oil mixed in it will be absorbed by the oil-absorbing sponge block. After a certain period of time, the corresponding oil-absorbing sponge block is extruded to discharge the absorbed lubricating oil into the installation housing. The oil-absorbing sponge block captures tiny oil droplets through physical adsorption, thus making up for the deficiencies of traditional centrifugal oil separators. At the same time, it can also adapt to high-humidity environments, effectively improving the adaptability of the cooling unit.

[0015] 2. In the present invention, since the size of one side of the first straight groove away from the axis of the heat exchange tube is set to be slightly larger than the size of the side of the first straight groove close to the axis of the heat exchange tube, and the size of one side of the second straight groove close to the axis of the heat exchange tube is set to be slightly larger than the size of the side of the second straight groove close to the axis of the heat exchange tube, the heat exchange capacity is further increased. Not only the heat exchange area is increased, but also turbulence can be generated during heat exchange under the action of the second straight groove, reducing the deposition of the oil film.

[0016] 3. In the present invention, through the setting of the oil separation component, good separation effect can still be maintained for tiny oil mists, and stable separation can still be maintained in a high-humidity environment, improving the stability and refrigeration effect of the cooling unit. Through the setting of the heat exchange component, even if a small amount of lubricating oil enters the evaporator, it will not overly affect the heat exchange effect of the heat exchange tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0018] Figure 1 is the schematic structural diagram of the whole in the present invention;

[0019] Figure 2 is the schematic structural diagram of the whole from another angle in the present invention;

[0020] Figure 3 is the schematic structural diagram of the whole from yet another angle in the present invention;

[0021] Figure 4 is the schematic cross-sectional structural diagram of the oil separation component in the present invention;

[0022] Figure 5 is the schematic cross-sectional structural diagram of the cooperation between the separation part and the extrusion part in the present invention;

[0023] Figure 6 is the schematic cross-sectional structural diagram of the heat exchange component in the present invention;

[0024] Figure 7 is the schematic structural diagram of the heat exchange tube in the present invention.

[0025] In the figure: 1. Condenser; 2. Control cabinet; 3. Screw compressor; 4. Outer shell; 5. Expansion valve; 6. Installation housing; 7. Collection cylinder; 8. Connecting pipe; 9. Discharge pipe; 10. Conical frame; 11. Partition board; 12. Through groove; 13. Oil absorption sponge block; 14. Extrusion frame; 15. Driving part; 16. Heat exchange tube; 17. Installation plate; 18. First straight groove; 19. Second straight groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] As Figures 1 to 7As shown in the figure, this embodiment proposes a flooded screw refrigeration unit, which includes a condenser 1, on which a control cabinet 2 is installed. A screw compressor 3 is also provided on the side of the condenser 1. It is characterized in that it further includes a housing 4, an oil separation component and a heat exchange component. The housing 4 is installed on the side of the condenser 1, and the screw compressor 3 is installed on the top of the housing 4. Communication cavities are respectively arranged at both ends inside the housing 4, and a heat exchange cavity is arranged between the two communication cavities. Among them, the input end of the screw compressor 3 is communicated with the housing 4, and an expansion valve 5 is communicated between the condenser 1 and the housing 4 through a pipeline. The oil separation component is installed on the condenser 1 and is communicated with the output end of the screw compressor 3, and is used for separating and collecting the lubricating oil in the gaseous refrigerant, and then discharging it. The oil separation component includes an installation housing 6, a collection cylinder 7, a discharge pipe 9, a separation part and an extrusion part. The installation housing 6 is fixedly installed on the condenser 1, the collection cylinder 7 is coaxially and fixedly installed on the inner bottom wall of the installation housing 6, and the collection cylinder 7 is communicated with the output end of the screw compressor 3 through a communication pipe 8. The discharge pipe 9 is communicated between the installation housing 6 and the input end of the condenser 1. The separation part is installed on the collection cylinder 7 and is used for separating the refrigerant and the lubricating oil. The extrusion part is installed on the installation housing 6 and is used for collecting the separated lubricating oil.

[0028] During the operation of the refrigeration unit, the liquid refrigerant is evenly distributed on the outer surface of the heat exchange component along the length direction of the evaporator through the liquid distributor, absorbs the heat of the water flowing in the heat exchange component, undergoes a phase change and becomes a gas. When the water is cooled, chilled water can be sent to the cold-using space. In order to prevent liquid from entering the compressor, a gas-liquid separation plate can also be arranged on the evaporator. The gaseous refrigerant passes through the gas-liquid separation plate at the upper part of the evaporator and is sucked into the screw compressor 3 through the suction pipe and the suction stop valve.

[0029] Since when the screw compressor 3 operates, the lubricating oil will be directly sprayed into the compression chamber to seal, cool and lubricate the rotor, a large amount of lubricating oil will be carried in the compressed high-temperature and high-pressure gas. If this oil enters the condenser 1 and the evaporator, it will cause the oil film to cover the wall of the heat exchange tube 16, reducing the heat transfer efficiency, and will also cause insufficient lubrication of the compressor, leading to wear or cylinder jamming failures. Therefore, before discharging the gaseous refrigerant into the condenser 1, it needs to be sent to the oil separation component first. The gaseous refrigerant is discharged into the oil separation component through the exhaust pipe and the exhaust stop valve of the screw compressor 3, enters the inside of the collection cylinder 7 through the communication pipe 8, and then the gaseous refrigerant moves upward until it leaves the collection cylinder 7 and enters the separation part. The separation part collects the lubricating oil mixed in the gaseous refrigerant. After a certain period of time, the lubricating oil collected by the separation part is periodically discharged through the extrusion part. The discharged lubricating oil flows into the area between the installation housing 6 and the cylinder for storage. It is also possible to send this lubricating oil back to the screw compressor 3 through an additional oil return pipeline to maintain the oil circulation balance.

[0030] The gaseous refrigerant from which the lubricating oil has been separated enters the condenser 1 through the discharge pipe 9. When the high-pressure and high-temperature gaseous refrigerant is discharged into the condenser 1, it first passes through the baffle plate at the upper part, so that the gaseous refrigerant evenly sweeps across the tube bundle of the condenser 1. The cooling circulating water from the cooling tower flows through the copper tubes inside the condenser 1, absorbs heat from the refrigerant to condense the refrigerant into a liquid state. Through the cooling water circulation, the heat absorbed by the unit from the cold space is discharged into the atmosphere. The condensed liquid refrigerant leaves the pipeline at the bottom of the condenser 1, passes through the throttling of the expansion valve 5, reduces the pressure of the liquid refrigerant, and finally enters the bottom of the evaporator through the liquid pipe, thus completing one cycle. Repeating this process continuously realizes the continuous refrigeration effect.

[0031] As described above, such as Figure 4 , Figure 5 shown, in order to separate the lubricating oil in the refrigerant, the separation part includes a conical frame 10, a partition plate 11, a through groove 12 and an oil-absorbing sponge block 13. The conical frame 10 is coaxially and fixedly installed on the collecting cylinder 7. There is a gap between the conical frame 10 and the inner wall of the installation shell 6. A number of partition plates 11 are fixedly installed on the conical frame 10 at equal angles. The partition plates 11 are fixedly connected to the collecting cylinder 7. A number of through grooves 12 are opened on the collecting cylinder 7 at equal angles. The number of partition plates 11 and the number of through grooves 12 are arranged alternately. An oil-absorbing sponge block 13 for separating the lubricating oil is arranged between every two partition plates 11. The oil-absorbing sponge blocks 13 are respectively in sliding contact with the partition plates 11 on both sides.

[0032] Specifically, when the gaseous refrigerant enters the collecting cylinder 7, the gaseous refrigerant entering the collecting cylinder 7 will be discharged through the through groove 12. During this process, it will pass through the oil-absorbing sponge block 13. The gaseous refrigerant can pass through the oil-absorbing sponge block 13, but the lubricating oil mixed in it will be absorbed by the oil-absorbing sponge block 13. After a certain period of time, the corresponding oil-absorbing sponge block 13 is squeezed, and the absorbed lubricating oil is discharged into the interior of the installation shell 6. Through the setting of the conical frame 10, the conical frame 10 can guide the discharged lubricating oil to the installation shell 6.

[0033] Furthermore, it should be noted that each oil-absorbing sponge block 13 corresponds to a through groove 12, and the lubricating oil in the gaseous refrigerant is collected separately. When the absorbed lubricating oil needs to be discharged, the oil-absorbing sponge block 13 is squeezed. At this time, the two sides of the corresponding oil-absorbing sponge block 13 are in sliding fit with the partition plate 11. And because chutes are provided on both sides of the partition plate 11, the sponge block will not shift or have gaps when being squeezed, and always maintains a good oil-absorbing effect. The oil-absorbing sponge block 13 can be replaced after aging.

[0034] It should be added that the oil-absorbing sponge block is made of "electrospun nanofiber porous sponge". It uses the electrospinning method to form a three-dimensional cross-linked network structure by stacking multiple layers of nanofibers. By adjusting the polymer types (such as polyacrylonitrile PAN, polyvinyl alcohol PVA, etc.) and adding hydrophobic components, the chemical properties of the fiber surface can be controlled, enhancing the flexibility and pore stability of the material. By controlling the number of spinning layers and the fiber arrangement, the pores can be effectively reduced, and finally a stable three-dimensional sponge body is formed, thus making the oil-absorbing sponge block. Its pore size is usually between 0.5μm and 10μm to achieve the technical effect of separating micro oil mists. Even in the case of oil mists ≤ 1 micron, a good separation effect can still be maintained.

[0035] As described above, such as Figure 4 、 Figure 5 shown, in order to collect the separated lubricating oil, the oil-absorbing sponge block 13 needs to be extruded. The extrusion part includes an extrusion frame 14 and a driving member 15. The extrusion frame 14 is slidably installed between every two partition plates 11. The inner side of the extrusion frame 14 is slidably abutted against the outer circumference of the collection cylinder 7. A plurality of driving members 15 are fixedly installed at the top of the installation housing 6 in a circumferential and equiangular manner. The driving member 15 generally adopts the form of an electric cylinder. The output end of the driving member 15 is fixedly connected to the extrusion frame 14. Both the upper and lower ends of the oil-absorbing sponge are set to be inclined. The bottom of the oil-absorbing sponge block 13 is adapted to the conical frame 10, and the top of the oil-absorbing sponge block 13 is adapted to the bottom of the extrusion frame 14. During the operation of the equipment, when the extrusion frame 14 extrudes the oil-absorbing sponge block 13, the lubricating oil absorbed in the oil-absorbing sponge block 13 will flow into the bottom of the installation housing 6.

[0036] Specifically, when collecting the lubricating oil absorbed by the oil-absorbing sponge block 13, start one or more corresponding driving members 15. The driving members 15 push the extrusion frame 14 to move, and the extrusion machine compresses the oil-absorbing sponge block 13 along the axis direction of the collection cylinder 7, so that the absorbed lubricating oil is discharged. When collecting, generally not all the driving members 15 are started at the same time, but one or more of them. The lubricating oil absorbed by one or more of the several oil-absorbing sponge blocks 13 is collected, and then the other uncollected oil-absorbing sponge blocks 13 are extruded. In this way, the lubricating oil is collected periodically, reducing the possibility of blockage and maintaining a good ability to filter lubricating oil.

[0037] Such as Figure 6 、 Figure 7As shown, the heat exchange component is installed inside the housing 4. The heat exchange component is located inside the heat exchange chamber and is used to transfer the heat of the medium to be cooled to the refrigerant. The heat exchange component includes heat exchange tubes 16 and a mounting plate 17. A number of heat exchange tubes 16 are fixedly installed inside the housing 4. The heat exchange tubes 16 are located in the heat exchange chamber. Both ends of the heat exchange tubes 16 are communicated with the communication chambers at both ends of the heat exchange chamber. A mounting plate 17 is fixedly installed inside one of the communication chambers. The mounting plate 17 divides this communication chamber into a liquid inlet area and a liquid outlet area. One end of the housing 4 is provided with an outlet and an inlet. The outlet is communicated with the liquid outlet area, and the inlet is communicated with the liquid inlet area;

[0038] Specifically, a liquid refrigerant is provided inside the housing 4, and the liquid level of the liquid refrigerant submerges the heat exchange tubes 16 and is evenly distributed on the outer surface of the heat exchange tubes 16. At this time, the water to be cooled enters the liquid inlet area of the first communication chamber through the inlet of the housing 4, and then enters the heat exchange tubes 16 communicated with the liquid inlet area until it flows into the communication chamber at the other end of the housing 4, and then enters the heat exchange tubes 16 communicated with the liquid outlet area through the communication chamber at the other end until the water enters the liquid outlet area. During this process, the water is cooled and discharged through the outlet, and chilled water can be sent to the cold-using space.

[0039] As Figure 7 shown, the heat exchange tubes 16 are also provided with a first straight groove 18 and a second straight groove 19. A number of first straight grooves 18 are circumferentially and equiangularly formed on the inner wall of the heat exchange tubes 16. Through the arrangement of the first straight grooves 18, when the water to be cooled flows through, it plays a role in making the flow rate uniform to a certain extent. A number of second straight grooves 19 are circumferentially and equiangularly formed on the outer wall of the heat exchange tubes 16. The number of second straight grooves 19 and the number of first straight grooves 18 are arranged in a staggered manner, and there is a toothed transition area between the number of first straight grooves 18 and the number of second straight grooves 19.

[0040] Specifically, when the water to be cooled flows through the heat exchange tubes 16, the water will enter a number of first straight grooves 18 inside the heat exchange tubes 16, and the liquid refrigerant will enter a number of second straight grooves 19 outside the heat exchange tubes 16. As Figure 7 shown, since the size of one side of the first straight groove 18 away from the axis of the heat exchange tube 16 is set to be slightly larger than the size of the side of the first straight groove 18 close to the axis of the heat exchange tube 16, and the size of one side of the second straight groove 19 close to the axis of the heat exchange tube 16 is set to be slightly larger than the size of the side of the second straight groove 19 close to the axis of the heat exchange tube 16, the heat exchange capacity is further increased. And due to the special structural design of the second straight groove 19, during heat exchange, a certain degree of turbulence will occur at the second straight groove 19, thereby reducing the possibility of lubricating oil adhering to the wall of the heat exchange tube 16 after entering the housing 4, which helps to improve the overall compactness and reliability of the refrigeration unit.

[0041] The working principle or usage process of this application is:

[0042] When the refrigeration unit is operating, there is liquid refrigerant in the housing 4, and the liquid level of the liquid refrigerant submerges the heat exchange tubes 16 and is evenly distributed on the outer surface of the heat exchange tubes 16. At this time, the water to be cooled enters the liquid inlet area of the first communication cavity through the inlet of the housing 4, and then enters the heat exchange tubes 16 communicating with the liquid inlet area until it flows into the communication cavity at the other end of the housing 4. Then, it enters the heat exchange tubes 16 communicating with the liquid outlet area through the communication cavity at the other end until the water enters the liquid outlet area. During this process, the water is cooled and discharged through the outlet, and then chilled water can be sent to the cold-using space. At this time, the liquid refrigerant absorbs the heat of the water flowing in the heat exchange tubes 16, undergoes a phase change and turns into a gas. The gaseous refrigerant passes through the gas-liquid separation plate above the evaporator and is sucked into the screw compressor 3 through the suction pipe and the suction stop valve.

[0043] Since when the screw compressor 3 is operating, lubricating oil will be directly sprayed into the compression cavity to seal, cool and lubricate the rotor, a large amount of lubricating oil will be carried in the compressed high-temperature and high-pressure gas. Therefore, before discharging the gaseous refrigerant into the condenser 1, it needs to be sent into the installation housing 6 first. When the gaseous refrigerant enters the collection cylinder 7, the gaseous refrigerant entering the collection cylinder 7 will be discharged through the through groove 12. During this process, it will pass through the oil-absorbing sponge block 13. The gaseous refrigerant can pass through the oil-absorbing sponge block 13, but the lubricating oil mixed in it will be absorbed by the oil-absorbing sponge block 13. When it is necessary to collect the lubricating oil absorbed by the oil-absorbing sponge block 13 after a certain period of time, one or more corresponding driving parts 15 are started. The driving part 15 pushes the extrusion frame 14 to move, and the extrusion machine squeezes the oil-absorbing sponge block 13 to be compressed along the axis direction of the collection cylinder 7, so that the absorbed lubricating oil is discharged. Through the setting of the conical frame 10, the conical frame 10 can guide the discharged lubricating oil to the installation housing 6 for storage. It can also be sent back to the screw compressor 3 by adding an oil return pipeline to maintain the oil circulation balance, reduce the possibility of blockage, and maintain a good ability to filter lubricating oil.

[0044] Then, the gaseous refrigerant from which the lubricating oil has been separated enters the condenser 1 through the discharge pipe 9. When the high-pressure and high-temperature gaseous refrigerant is discharged into the condenser 1, it first passes through the air baffle plate at the upper part, so that the gaseous refrigerant evenly passes over the condenser 1 tube bundle. The cooling circulating water from the cooling tower flows through the condenser 1 copper tube, absorbs heat from the refrigerant and condenses the refrigerant into a liquid state. Through the cooling water circulation, the heat absorbed by the unit from the cold space is discharged into the atmosphere. The condensed liquid refrigerant leaves the pipeline at the bottom of the condenser 1, passes through the throttling of the expansion valve 5, reduces the pressure of the liquid refrigerant, and finally enters the bottom of the evaporator through the liquid pipe, thus completing one cycle. Repeating this process continuously realizes the continuous refrigeration function.

[0045] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flooded screw refrigeration unit, comprising a condenser (1), on which a control cabinet (2) is installed, and a screw compressor (3) is further arranged on the side of the condenser (1), characterized in that, It further includes a housing (4), an oil separation component, and a heat exchange component. The housing (4) is installed on the side of the condenser (1). The screw compressor (3) is installed on the top of the housing (4). Communication cavities are respectively arranged at both ends inside the housing (4). A heat exchange cavity is arranged between the two communication cavities. Among them, the input end of the screw compressor (3) is communicated with the housing (4). An expansion valve (5) is communicated between the condenser (1) and the housing (4) through a pipeline. The oil separation component is installed on the condenser (1). The oil separation component is communicated with the output end of the screw compressor (3) and is used for separating and collecting the lubricating oil in the gaseous refrigerant and then discharging it. The heat exchange component is installed inside the housing (4). The heat exchange component is located inside the heat exchange cavity and is used for transferring the heat of the medium to be cooled to the refrigerant; Among them, the oil separation component includes an installation housing (6), a collection cylinder (7), a discharge pipe (9), a separation part, and an extrusion part. The installation housing (6) is fixedly installed on the condenser (1). The collection cylinder (7) is coaxially and fixedly installed on the inner bottom wall of the installation housing (6). The collection cylinder (7) is communicated with the output end of the screw compressor (3) through a communication pipe (8). The discharge pipe (9) is communicated between the installation housing (6) and the input end of the condenser (1). The separation part is installed on the collection cylinder (7) and is used for separating the refrigerant and the lubricating oil. The extrusion part is installed on the installation housing (6) and is used for collecting the separated lubricating oil; Among them, the separation part includes a conical frame (10), a partition plate (11), a through groove (12), and an oil-absorbing sponge block (13). The conical frame (10) is coaxially and fixedly installed on the collection cylinder (7). There is a gap between the conical frame (10) and the inner wall of the installation housing (6). A plurality of the partition plates (11) are fixedly installed on the conical frame (10) at equal angles. The partition plates (11) are fixedly connected to the collection cylinder (7). A plurality of the through grooves (12) are opened on the collection cylinder (7) at equal angles. The plurality of the partition plates (11) and the plurality of the through grooves (12) are arranged in a staggered manner. An oil-absorbing sponge block (13) for separating the lubricating oil is arranged between every two of the partition plates (11); Among them, the extrusion part includes an extrusion frame (14) and a driving part (15). The extrusion frame (14) is slidably installed between every two of the partition plates (11). The inner side of the extrusion frame (14) is in sliding contact with the outer circle of the collection cylinder (7). A plurality of the driving parts (15) are fixedly installed on the top of the installation housing (6) at equal angles in a circumferential shape. The output end of the driving part (15) is fixedly connected to the extrusion frame (14).

2. The flooded screw refrigeration unit according to claim 1, characterized in that, The oil-absorbing sponge block (13) is in sliding contact with the partition plates (11) on both sides respectively. Both the upper and lower ends of the oil-absorbing sponge are arranged in an inclined shape. The bottom of the oil-absorbing sponge block (13) is adapted to the conical frame (10), and the top of the oil-absorbing sponge block (13) is adapted to the bottom of the extrusion frame (14).

3. The flooded screw refrigeration unit according to claim 1, wherein, The heat exchange assembly includes a heat exchange tube (16) and a mounting plate (17). A plurality of the heat exchange tubes (16) are fixedly installed inside the outer shell (4). The heat exchange tubes (16) are located in the heat exchange chamber. The two ends of the heat exchange tube (16) are respectively communicated with the communication chambers at both ends of the heat exchange chamber. The mounting plate (17) is fixedly installed inside one of the communication chambers. The mounting plate (17) divides this communication chamber into a liquid inlet area and a liquid outlet area. One end of the outer shell (4) is provided with an outlet and an inlet. The outlet is communicated with the liquid outlet area, and the inlet is communicated with the liquid inlet area.

4. The flooded screw refrigeration unit according to claim 3, characterized in that, It further includes a first straight groove (18) and a second straight groove (19). A plurality of the first straight grooves (18) are circumferentially and equiangularly formed on the inner wall of the heat exchange tube (16). A plurality of the second straight grooves (19) are circumferentially and equiangularly formed on the outer wall of the heat exchange tube (16). The plurality of the second straight grooves (19) and the plurality of the first straight grooves (18) are arranged in a staggered manner.

5. The flooded screw refrigeration unit according to claim 4, characterized in that, There is a toothed transition area between the plurality of the first straight grooves (18) and the plurality of the second straight grooves (19).

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