Double-head centrifugal compressor unit based on plate exchange heat recovery and multi-oil circuit circulation system

Abstract

The utility model discloses a kind of heat recovery and multi-oil path circulation system based on plate exchange of double-head centrifugal compressor unit, it includes first compressor, second compressor, first heat exchanger, second heat exchanger and condenser, first compressor has first oil pump export, first gear end lubricating oil inlet, first motor rear end lubricating oil inlet, second compressor has oil outlet, second oil pump export, second gear end lubricating oil inlet, second motor rear end lubricating oil inlet, first oil pump export is connected in oil outlet, and first oil pump export is connected in first gear end lubricating oil inlet and first motor rear end lubricating oil inlet, second oil pump export is connected in first gear end lubricating oil inlet, and second oil pump export is connected in second gear end lubricating oil inlet and second motor rear end lubricating oil inlet, the outlet of condenser is connected in first heat exchanger and second heat exchanger. The heat of lubricating oil is fully recovered, ensure that lubricating oil can be accurately delivered to each key position.

Description

Technical Field

[0001] This utility model relates to a heat recovery and multi-oil circulation system based on plate heat exchanger for a dual-head centrifugal compressor unit. Background Technology

[0002] Traditional dual-head centrifugal compressor units have relatively simple oil circulation systems. Lubricating oil is pumped from the oil tank, filtered, and then delivered to various components requiring lubrication and cooling, such as the compressor's bearings and gears. After completing lubrication and cooling tasks, the hot lubricating oil returns directly to the oil tank without effectively handling the heat it carries. In most existing technologies, the heat from the hot lubricating oil is typically considered useless and dissipated directly into the surrounding environment through methods such as air or water cooling. Furthermore, the oil circulation system operates independently from other systems in the unit (such as the refrigeration system), lacking effective integration. For example, the refrigerant's heat exchange process relies on dedicated evaporators and condensers, utilizing external cold or heat sources independently, without any connection to the heat from the hot lubricating oil.

[0003] The aforementioned methods of treating hot lubricating oil directly release a large amount of heat into the environment. This heat could have been used for other beneficial purposes, such as preheating refrigerant or assisting in heating process fluids. This waste leads to low energy utilization of the unit and increases unnecessary energy consumption during long-term operation, resulting in significant energy waste.

[0004] Meanwhile, traditional air-cooling or water-cooling methods for cooling hot lubricating oil exhibit significant differences in effectiveness under varying environmental conditions. Air cooling is markedly affected by ambient temperature, with its cooling effect greatly reduced in high-temperature environments; while water cooling is relatively stable, it is highly dependent on water resources, making it difficult to apply in water-scarce areas. This limits the widespread application of dual-head centrifugal compressor units under different environmental conditions, resulting in poor environmental adaptability.

[0005] Furthermore, the lack of coordination between lubricating oil cooling and refrigerant heat exchange makes it impossible to flexibly adjust energy distribution according to the real-time operating conditions of the unit. For example, during the unit startup phase, if the heat from the hot lubricating oil could be used to accelerate refrigerant evaporation, the refrigeration system could enter a stable operating state more quickly. However, this cannot be achieved using traditional methods, thus affecting the overall startup performance and dynamic response capability of the unit, and reducing the overall operating efficiency of the unit under different operating conditions. Utility Model Content

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings of existing systems. This invention provides a heat recovery and multi-oil circulation system based on plate heat exchanger for a dual-head centrifugal compressor unit.

[0007] This utility model is achieved through the following technical solution:

[0008] A dual-head centrifugal compressor unit based on plate heat exchanger heat recovery and multi-oil circulation system includes a first compressor, a second compressor, a first heat exchanger, a second heat exchanger, and a condenser. The first compressor has a first oil pump outlet, a first gear end lubricating oil inlet, and a first motor rear end lubricating oil inlet. The second compressor has an oil inlet, a second oil pump outlet, a second gear end lubricating oil inlet, and a second motor rear end lubricating oil inlet. The first oil pump outlet is connected to the oil inlet and communicates with the second compressor. The first oil pump outlet is connected to the first gear end lubricating oil inlet and the first motor rear end lubricating oil inlet through the first heat exchanger. The second oil pump outlet is connected to the first gear end lubricating oil inlet and communicates with the first compressor. The second oil pump outlet is connected to the second gear end lubricating oil inlet and the second motor rear end lubricating oil inlet through the second heat exchanger. The outlet of the condenser is connected to the first heat exchanger and the second heat exchanger, so that the refrigerant flowing out of the condenser exchanges heat with the lubricating oil in the first heat exchanger and the second heat exchanger, respectively.

[0009] Furthermore, the dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circulation system, also includes a first injection pump. The first compressor also has a first guide vane oil return outlet and a first guide vane oil return port. The inlet of the first injection pump is connected to the condenser and the first guide vane oil return outlet, and the outlet of the first injection pump is connected to the first guide vane oil return port and communicates with the first compressor.

[0010] Furthermore, the dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil-circulation system, also includes a second injection pump. The second compressor also has a second guide vane oil return outlet and a second guide vane oil return port. The inlet of the second injection pump is connected to the condenser and the second guide vane oil return outlet, and the outlet of the second injection pump is connected to the second guide vane oil return port and communicates with the second compressor.

[0011] Furthermore, the dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circuit circulation system, also includes an evaporator. The first heat exchanger has a first heat source inlet, a first heat source outlet, a first cold source inlet, and a first cold source outlet. The first heat source inlet is connected to the outlet of the first oil pump, the first heat source outlet is connected to the lubricating oil inlet at the first gear end and the lubricating oil inlet at the rear end of the first motor, the first cold source inlet is connected to the outlet of the condenser, and the first cold source outlet is connected to the evaporator.

[0012] Furthermore, the dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circuit circulation system, also includes a third injection pump. The first compressor also has an evaporator oil return port. The inlet of the third injection pump is connected to the condenser and the evaporator, and the outlet of the third injection pump is connected to the evaporator oil return port and communicates with the first compressor.

[0013] Furthermore, the dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circuit circulation system, also includes an economizer. The second heat exchanger has a second heat source inlet, a second heat source outlet, a second cold source inlet, and a second cold source outlet. The second heat source inlet is connected to the outlet of the second oil pump, the second heat source outlet is connected to the lubricating oil inlet at the end of the second gear and the lubricating oil inlet at the rear end of the second motor, the second cold source inlet is connected to the outlet of the condenser, and the second cold source outlet is connected to the economizer.

[0014] Furthermore, a first solenoid valve and / or a first check valve are provided between the outlet of the first oil pump and the oil inlet;

[0015] And / or, a second solenoid valve and / or a second check valve are provided between the outlet of the second oil pump and the lubricating oil inlet of the first gear end.

[0016] Furthermore, the first heat source outlet is equipped with a first oil flow control device and / or a first oil filter;

[0017] And / or, the second heat source outlet is provided with a second oil flow control device and / or a second oil filter.

[0018] Furthermore, the dual-head centrifugal compressor unit based on plate heat exchanger heat recovery and multi-oil circulation system also includes a third oil flow control device, which is located at the outlet of the first oil pump and is used to control the oil flow rate flowing out of the outlet of the first oil pump.

[0019] And / or, the dual-head centrifugal compressor unit based on plate heat exchanger heat recovery and multi-oil circulation system further includes a fourth oil flow control device, which is located at the outlet of the second oil pump and is used to control the oil flow rate flowing out of the outlet of the second oil pump.

[0020] Furthermore, the first heat exchanger is a plate heat exchanger;

[0021] And / or, the second heat exchanger is a plate heat exchanger.

[0022] The beneficial effects of this utility model are as follows:

[0023] This utility model discloses a dual-head centrifugal compressor unit based on plate heat exchanger heat recovery and a multi-oil-circuit system. Through a first and second heat exchanger, the lubricating oil flowing from the first and second compressors exchanges heat with the refrigerant flowing from the condenser, thereby fully recovering the heat from the lubricating oil and providing additional energy to the refrigerant. This reduces external energy consumption, improves energy efficiency, and lowers the overall operating cost of the unit. Simultaneously, it ensures precise delivery of lubricating oil to all critical components, achieving more effective lubrication and cooling. This not only extends the service life of compressor components but also reduces the probability of malfunctions due to insufficient lubrication and cooling, improving the reliability and stability of the unit's operation, reducing maintenance costs and downtime; furthermore, it improves the unit's operating efficiency under different operating conditions, resulting in an overall efficiency improvement. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the heat recovery and multi-oil circulation system based on plate heat exchanger of the dual-head centrifugal compressor unit according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] Condenser 1

[0027] First compressor 2

[0028] First oil pump outlet 21

[0029] First gear end lubricating oil inlet 22

[0030] First motor rear end lubricating oil inlet 23

[0031] First guide vane return oil outlet 24

[0032] First guide vane return oil inlet 25

[0033] Evaporator oil return port 26

[0034] Second compressor 3

[0035] Oil inlet 31

[0036] Second oil pump outlet 32

[0037] Lubricating oil inlet 33 at the second gear end

[0038] The second motor's rear end lubricating oil inlet 34

[0039] Second guide vane oil return outlet 35

[0040] Second guide vane return oil inlet 36

[0041] First heat exchanger 4

[0042] First heat source inlet 41

[0043] First heat source outlet 42

[0044] First cold source import 43

[0045] First cold source outlet 44

[0046] Second heat exchanger 5

[0047] Second heat source inlet 51

[0048] Second heat source outlet 52

[0049] Second cold source import 53

[0050] Second cold source outlet 54

[0051] Evaporator 6

[0052] Economy 7

[0053] First jet pump 8

[0054] Second jet pump 9

[0055] Third jet pump 10

[0056] First solenoid valve 11

[0057] First check valve 12

[0058] Second solenoid valve 13

[0059] Second check valve 14

[0060] First oil flow control device 15

[0061] First oil filter 16

[0062] Second oil flow control device 17

[0063] Second oil filter 18

[0064] Third oil flow control device 19

[0065] Fourth oil flow control device 20 Detailed Implementation

[0066] The following description of the embodiments is taken with reference to the accompanying drawings, which illustrate specific embodiments in which the present invention can be implemented.

[0067] like Figure 1As shown, this embodiment discloses a heat recovery and multi-oil circulation system based on a plate heat exchanger for a dual-head centrifugal compressor unit. This system includes a condenser 1, a first compressor 2, a second compressor 3, a first heat exchanger 4, and a second heat exchanger 5. The first compressor 2 has a first oil pump outlet 21, a first gear end lubricating oil inlet 22, and a first motor rear end lubricating oil inlet 23. The second compressor 3 has an oil inlet 31, a second oil pump outlet 32, a second gear end lubricating oil inlet 33, and a second motor rear end lubricating oil inlet 34. The first oil pump outlet 21 is connected to the oil inlet... The outlet 31 is connected to the second compressor 3, and the outlet 21 of the first oil pump is connected to the lubricating oil inlet 22 at the first gear end and the lubricating oil inlet 23 at the rear end of the first motor through the first heat exchanger 4. The outlet 32 ​​of the second oil pump is connected to the lubricating oil inlet 22 at the first gear end and is connected to the first compressor 2. The outlet 32 ​​of the second oil pump is connected to the lubricating oil inlet 33 at the second gear end and the lubricating oil inlet 34 at the rear end of the second motor through the second heat exchanger 5. The outlet of the condenser 1 is connected to the first heat exchanger 4 and the second heat exchanger 5 so that the refrigerant flowing out of the condenser 1 exchanges heat with the lubricating oil in the first heat exchanger 4 and the second heat exchanger 5 respectively.

[0068] The lubricating oil in the first compressor 2 is discharged through the outlet 21 of the first oil pump and splits into two branches. The first branch flows into the second compressor 3 through the oil inlet 31 to supply oil. The second branch passes through the first heat exchanger 4, where the lubricating oil is cooled and heat is recovered. Finally, it flows into the first gear end lubricating oil inlet 22 and the rear end lubricating oil inlet 23 of the first motor to supply oil. The lubricating oil in the second compressor 3 is discharged through the outlet 32 ​​of the second oil pump and splits into two branches. The first branch flows into the first compressor 2 through the first gear end lubricating oil inlet 22 to supply oil, providing lubricating oil to the compressor gearbox for lubrication and cooling. The second branch passes through the second heat exchanger 5, where the lubricating oil is cooled and heat is recovered. Finally, it flows into the second gear end lubricating oil inlet 33 and the rear end lubricating oil inlet 34 of the second motor to supply oil. The refrigerant flowing out of the condenser 1 exchanges heat with the lubricating oil in the first heat exchanger 4 and the second heat exchanger 5 respectively. The refrigerant enters the first heat exchanger 4 through the first heat exchanger 4 and exchanges heat with the lubricating oil discharged from the first oil pump outlet 21. The refrigerant enters the second heat exchanger 5 through the second heat exchanger 5 and exchanges heat with the lubricating oil discharged from the second oil pump outlet 32.

[0069] This embodiment of the dual-head centrifugal compressor unit utilizes a plate heat exchanger and a multi-oil-path circulation system to achieve heat recovery: The lubricating oil flowing from the first compressor 2 and the second compressor 3 exchanges heat with the refrigerant flowing from the condenser 1 through the first heat exchanger 4 and the second heat exchanger 5, thus fully recovering the heat from the lubricating oil and providing additional energy to the refrigerant, reducing external energy consumption. For example, in a refrigeration system, this reduces the additional energy consumption for heating the refrigerant, improves energy efficiency, and lowers the overall operating cost of the unit. Over the long term, this can save enterprises significant energy expenditures. The optimized oil circulation system is designed for different operating conditions and component requirements, ensuring that lubricating oil is accurately delivered to key parts for more effective lubrication and cooling. The main oil path ensures the normal operation of key moving parts, the return oil path promptly recovers and filters lubricating oil, and the auxiliary oil cooling circulation path flexibly regulates oil temperature. This not only extends the service life of the compressor components but also reduces the probability of failures due to insufficient lubrication and cooling, improves the reliability and stability of the unit's operation, and reduces maintenance costs and downtime. Enhanced system synergy: The integration of heat recovery and multi-oil-circuit systems enables the oil circulation and refrigeration systems to work in tandem. During unit startup, the heat from the hot lubricating oil accelerates the refrigerant to a suitable operating state, shortening startup time. During partial load operation, by rationally controlling the oil circuit and heat recovery process, the thermodynamic cycle of the refrigerant is optimized, improving the unit's operating efficiency under different operating conditions. Compared to traditional independently operating systems, the overall efficiency is improved.

[0070] This embodiment of the dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and a multi-oil-path circulation system, relates to a technology that utilizes heat exchange to recover heat from the lubricating oil and integrates a multi-oil-path circulation system to optimize the energy utilization efficiency and improve the operational stability of the dual-head centrifugal compressor unit. This technology is widely used in industries requiring dual-head centrifugal compressor units, such as refrigeration, air conditioning, and industrial production. It aims to improve the energy utilization efficiency and overall performance of the dual-head centrifugal compressor unit through innovative oil path design and heat recovery mechanisms. Through innovative structural design and system integration, it solves the problems of energy waste and low system efficiency inherent in traditional dual-head centrifugal compressor units. Specifically, it achieves effective recovery and utilization of heat from the lubricating oil by exchanging heat with the refrigerant, while optimizing the oil circulation path within the unit, enabling the various oil path systems to work collaboratively, improving the overall performance of the unit, and meeting the demands of modern industry for efficient, energy-saving, and stable operating equipment.

[0071] In this embodiment, the dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil-path circulation system, also includes an evaporator 6. The first heat exchanger 4 has a first heat source inlet 41, a first heat source outlet 42, a first cold source inlet 43, and a first cold source outlet 44. The first heat source inlet 41 is connected to the first oil pump outlet 21, the first heat source outlet 42 is connected to the first gear end lubricating oil inlet 22 and the first motor rear end lubricating oil inlet 23, the first cold source inlet 43 is connected to the outlet of the condenser 1, and the first cold source outlet 44 is connected to the evaporator 6. The heated lubricating oil inside the first compressor 2 flows through the first oil pump outlet 21 to the first heat source inlet 41, and then through the first heat source outlet 42 to the first gear end lubricating oil inlet 22 and the first motor rear end lubricating oil inlet 23. The refrigerant in the condenser 1 flows into the first heat exchanger 4 through the first cold source inlet 43, and then through the first cold source outlet 44 to the evaporator 6.

[0072] The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and a multi-oil-circuit system, also includes an economizer 7. The second heat exchanger 5 has a second heat source inlet 51, a second heat source outlet 52, a second cold source inlet 53, and a second cold source outlet 54. The second heat source inlet 51 is connected to the second oil pump outlet 32, the second heat source outlet 52 is connected to the second gear end lubricating oil inlet 33, and the second motor rear end lubricating oil inlet 34. The second cold source inlet 53 is connected to the outlet of the condenser 1, and the second cold source outlet 54 is connected to the economizer 7. The heated lubricating oil inside the second compressor 3 flows through the second oil pump outlet 32 ​​to the second heat source inlet 51, and then through the second heat source outlet 52 to the second gear end lubricating oil inlet 33 and the second motor rear end lubricating oil inlet 34. The refrigerant in the condenser 1 flows into the second heat exchanger 5 through the second cold source inlet 53, and then through the second cold source outlet 54 to the economizer 7.

[0073] In this embodiment, the first heat exchanger 4 is a plate heat exchanger. The second heat exchanger 5 is a plate heat exchanger. The plate heat exchanger uses a high-efficiency thermally conductive material to ensure excellent heat transfer performance. The internal design of the plate heat exchanger is a multi-layered staggered flow channel structure. One layer of channels is used for the flow of hot lubricating oil, and another layer is used for the flow of refrigerant, allowing the hot lubricating oil and refrigerant to exchange heat efficiently without contacting each other.

[0074] The first heat exchanger 4 and the second heat exchanger 5 are connected in parallel. The condenser 1 is connected to the cold source inlet of the first heat exchanger 4 and the second heat exchanger 5 via a specific branch of the refrigerant pipeline, allowing the high-pressure liquid refrigerant flowing from the lower end of the condenser 1 to flow into the first heat exchanger 4 and the second heat exchanger 5. During its flow within the first and second heat exchangers 4 and 5, the refrigerant absorbs heat released by the hot lubricating oil. A solenoid valve is installed on the refrigerant inlet pipeline to control the refrigerant pressure entering the heat exchanger, thereby better regulating the heat exchange effect and providing data support for system operation control.

[0075] The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and a multi-oil-circulation system, also includes a first ejector pump 8. The first compressor 2 further has a first guide vane oil return outlet 24 and a first guide vane oil return port 25. The inlet of the first ejector pump 8 is connected to the condenser 1 and the first guide vane oil return outlet 24, and the outlet of the first ejector pump 8 is connected to the first guide vane oil return port 25 and communicates with the first compressor 2. A channel is led out from the top of the condenser 1 and connected to the inlet of the first ejector pump 8, allowing high-pressure gaseous refrigerant to flow into the first ejector pump 8, using the high-pressure potential energy of the refrigerant itself to power the ejector pump. The connection between the condenser 1 and the first ejector pump 8 is specially designed to ensure smooth flow of high-pressure gaseous refrigerant while preventing leakage. When the first ejector pump 8 is working, the high-pressure gaseous refrigerant is ejected at high speed through a special nozzle structure, forming a local low-pressure zone inside the first ejector pump 8. This draws in the lubricating oil at the first guide vane oil return outlet 24, mixes and accelerates it with the refrigerant, and then delivers it to the first guide vane oil return port 25 through a dedicated oil return pipeline.

[0076] The system comprises a first guide vane oil return path formed by the first guide vane oil return outlet 24, the first jet pump 8, and the first guide vane oil return port 25. This path originates at the first guide vane oil return outlet 24, which is connected to the first jet pump 8 in a sealed and compatible manner. The connecting pipeline is made of pressure-resistant and oil-corrosion-resistant materials to ensure no leakage risk during lubricant transmission. The selected first jet pump 8 is specifically designed for this oil return scenario, possessing a structure and performance parameters highly matched to the system, enabling efficient utilization of external energy for lubricant suction and delivery. This oil return pipeline also exhibits excellent pressure and corrosion resistance, and a buffer bend structure is installed near the first guide vane oil return port 25 to reduce the impact of the lubricant and ensure its smooth entry into the compressor's internal oil tank. In addition, pressure, temperature and flow sensors can be installed at key nodes such as the first guide vane return oil outlet 24, the inlet and outlet of the first injection pump 8 and the first guide vane return oil inlet 25 to monitor various parameters in real time during the return oil process, so as to regulate and monitor the entire guide vane return oil circuit system and ensure the reliability, stability and efficiency of the system operation.

[0077] The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and a multi-oil-circulation system, also includes a second ejector pump 9. The second compressor 3 further has a second guide vane oil return outlet 35 and a second guide vane oil return port 36. The inlet of the second ejector pump 9 is connected to the condenser 1 and the second guide vane oil return outlet 35, and the outlet of the second ejector pump 9 is connected to the second guide vane oil return port 36 and communicates with the second compressor 3. Another channel is led out from the top of the condenser 1 and connected to the inlet of the second ejector pump 9, allowing high-pressure gaseous refrigerant to flow into the second ejector pump 9, utilizing the refrigerant's own high-pressure potential energy to power the ejector pump. The connection between the condenser 1 and the second ejector pump 9 is specially designed to ensure smooth flow of high-pressure gaseous refrigerant while preventing leakage. When the second ejector pump 9 is working, the high-pressure gaseous refrigerant is ejected at high speed through a special nozzle structure, forming a local low-pressure zone inside the second ejector pump 9. This draws in lubricating oil from the second guide vane oil return outlet 35, mixes with the refrigerant, accelerates the mixture, and then delivers it to the second guide vane oil return port 36 through a dedicated oil return pipeline. The second guide vane oil return path is formed through the second guide vane oil return outlet 35, the second injection pump 9, and the second guide vane oil return port 36, and the compressor guide vane oil return path is consistent.

[0078] The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and a multi-oil-circulation system, also includes a third ejector pump 10. The first compressor 2 also has an evaporator oil return port 26. The inlet of the third ejector pump 10 is connected to the condenser 1 and the evaporator 6, and the outlet of the third ejector pump 10 is connected to the evaporator oil return port 26 and communicates with the first compressor 2. High-pressure refrigerant vapor is drawn from the condenser 1 and enters the ejector of the third ejector pump 10. A mixture of lubricating oil and liquid refrigerant is drawn from the bottom of the evaporator 6 and mixed into the evaporator oil return port 26. The refrigerant gas at the evaporator oil return port 26 is compressed by the first compressor 2. Liquid oil is deposited at the inlet of the first compressor 2. The lubricating oil deposited at the inlet of the first compressor 2 is drawn out by the high-pressure refrigerant vapor in the condenser through the first guide vane oil return path and a second ejector, mixed into the oil tank inlet.

[0079] Among them, the appendix Figure 1 The thicker pipes are refrigerant channels, and the thinner pipes are lubricating oil lines. Because there are many refrigerant and lubricating oil channels and they intersect, [further details are needed]. Figure 1 Some refrigerant flow channels and lubricating oil pipes are not shown.

[0080] In this embodiment, a first solenoid valve 11 is provided between the first oil pump outlet 21 and the oil inlet 31, facilitating operation and control. A first check valve 12 is also provided between the first oil pump outlet 21 and the oil inlet 31 to effectively prevent backflow of lubricating oil, ensuring high safety and stability. The system utilizes pressure sensors at each node in collaboration with the main control PLC to achieve optimized lubricating oil control and complete the lubrication heat recovery cycle. The main control PLC can be electrically connected to the first solenoid valve 11.

[0081] A second solenoid valve 13 is provided between the outlet 32 ​​of the second oil pump and the lubricating oil inlet 22 of the first gear end. The main control PLC can be electrically connected to the second solenoid valve 13 for easy operation and control. A second check valve 14 is provided between the outlet 32 ​​of the second oil pump and the lubricating oil inlet 22 of the first gear end to effectively prevent backflow of lubricating oil and ensure high safety and stability.

[0082] A first oil flow control device 15 is installed at the first heat source outlet 42 to regulate the flow rate of the lubricating oil flowing out of the first heat source outlet 42. A main control PLC can be electrically connected to the first oil flow control device 15 for easy adjustment and control. A first oil filter 16 is installed at the first heat source outlet 42 to filter the lubricating oil flowing out of the first heat source outlet 42. After purification, the oil finally flows in two streams to the lubricating oil inlet 22 at the first gear end and the lubricating oil inlet 23 at the rear end of the first motor.

[0083] The second heat source outlet 52 is equipped with a second oil flow control device 17, which regulates the flow rate of the lubricating oil exiting the second heat source outlet 52. The main control PLC can be electrically connected to the second oil flow control device 17 for easy adjustment and control. The second heat source outlet 52 is also equipped with a second oil filter 18, which filters the lubricating oil exiting the second heat source outlet 52. After purification, the oil flows in two streams to the second gear end lubricating oil inlet 33 and the second motor rear end lubricating oil inlet 34. The first oil flow control device 15 can be an oil flow switch. The second oil flow control device 17 can also be an oil flow switch.

[0084] The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and a multi-oil-circulation system, also includes a third oil flow control device 19. This device 19 is located at the outlet 21 of the first oil pump and controls the oil flow rate from that outlet. After being pressurized by the oil pump, the lubricating oil from the storage tank flows out through the outlet 21 of the first oil pump. The third oil flow control device 19 regulates the flow rate of the lubricating oil from the outlet 21. The oil path then splits into two branches: the first branch supplies oil to the second compressor 3, equipped with a first solenoid valve 11 and a first check valve 12 for oil supply control and reverse shut-off; the second branch cools and recovers the lubricating oil through the first heat exchanger 4, then purifies it through a filtration system (including the first oil flow control device 15 and the first oil filter 16), finally supplying oil to the first gear end lubricating oil inlet 22 and the first motor rear end lubricating oil inlet 23, before returning to the lubricating oil storage tank for the next cycle.

[0085] The first compressor 2 and the second compressor 3 are respectively equipped with a first oil pump outlet 21 and a second oil pump outlet 32, which are connected to the heat source inlets of the first heat exchanger 4 and the second heat exchanger 5 through pipelines to ensure that the high-temperature lubricating oil discharged from the compressor can flow smoothly. A silencer and an oil flow switch are installed on the pipeline, which not only reduces noise but also adjusts the flow rate of hot lubricating oil entering the heat exchanger according to actual operating conditions, thereby controlling the heat exchange intensity.

[0086] The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and a multi-oil circulation system, also includes a fourth oil flow control device 20. This fourth oil flow control device 20 is located at the outlet 32 ​​of the second oil pump and is used to control the oil flow rate exiting the outlet 32. Lubricating oil, pressurized by the oil pump from the lubricating oil storage tank, flows out through the outlet 32 ​​of the second oil pump. The fourth oil flow control device 20 regulates the flow rate of the lubricating oil exiting the outlet 32. The third oil flow control device 19 can be an oil flow switch. The fourth oil flow control device 20 can also be an oil flow switch.

[0087] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A dual-head centrifugal compressor unit based on plate heat exchanger heat recovery and multi-oil circulation system, characterized in that, It includes a first compressor, a second compressor, a first heat exchanger, a second heat exchanger, and a condenser. The first compressor has a first oil pump outlet, a first gear end lubricating oil inlet, and a first motor rear end lubricating oil inlet. The second compressor has an oil outlet, a second oil pump outlet, a second gear end lubricating oil inlet, and a second motor rear end lubricating oil inlet. The first oil pump outlet is connected to the oil outlet and communicates with the second compressor. The first oil pump outlet is connected to the first gear end lubricating oil inlet and the first motor rear end lubricating oil inlet through the first heat exchanger. The second oil pump outlet is connected to the first gear end lubricating oil inlet and communicates with the first compressor. The second oil pump outlet is connected to the second gear end lubricating oil inlet and the second motor rear end lubricating oil inlet through the second heat exchanger. The outlet of the condenser is connected to the first heat exchanger and the second heat exchanger, so that the refrigerant flowing out of the condenser exchanges heat with the lubricating oil in the first heat exchanger and the second heat exchanger, respectively.

2. The dual-head centrifugal compressor unit as described in claim 1, characterized in that, The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circulation system, also includes a first injection pump. The first compressor also has a first guide vane oil return outlet and a first guide vane oil return port. The inlet of the first injection pump is connected to the condenser and the first guide vane oil return outlet, and the outlet of the first injection pump is connected to the first guide vane oil return port and communicates with the first compressor.

3. The dual-head centrifugal compressor unit as described in claim 1, characterized in that, The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circulation system, also includes a second injection pump. The second compressor also has a second guide vane oil return outlet and a second guide vane oil return port. The inlet of the second injection pump is connected to the condenser and the second guide vane oil return outlet, and the outlet of the second injection pump is connected to the second guide vane oil return port and communicates with the second compressor.

4. The dual-head centrifugal compressor unit as described in claim 1, characterized in that, The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circulation system, also includes an evaporator. The first heat exchanger has a first heat source inlet, a first heat source outlet, a first cold source inlet, and a first cold source outlet. The first heat source inlet is connected to the outlet of the first oil pump, the first heat source outlet is connected to the lubricating oil inlet at the first gear end and the lubricating oil inlet at the rear end of the first motor, the first cold source inlet is connected to the outlet of the condenser, and the first cold source outlet is connected to the evaporator.

5. The dual-head centrifugal compressor unit as described in claim 4, characterized in that, The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circulation system, also includes a third injection pump. The first compressor also has an evaporator oil return port. The inlet of the third injection pump is connected to the condenser and the evaporator, and the outlet of the third injection pump is connected to the evaporator oil return port and communicates with the first compressor.

6. The dual-head centrifugal compressor unit as described in claim 4, characterized in that, The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circulation system, also includes an economizer. The second heat exchanger has a second heat source inlet, a second heat source outlet, a second cold source inlet, and a second cold source outlet. The second heat source inlet is connected to the outlet of the second oil pump, the second heat source outlet is connected to the lubricating oil inlet at the end of the second gear and the lubricating oil inlet at the rear end of the second motor, the second cold source inlet is connected to the outlet of the condenser, and the second cold source outlet is connected to the economizer.

7. The dual-head centrifugal compressor unit as described in claim 6, characterized in that, A first solenoid valve and / or a first check valve are provided between the outlet of the first oil pump and the oil inlet; And / or, a second solenoid valve and / or a second check valve are provided between the outlet of the second oil pump and the lubricating oil inlet of the first gear end.

8. The dual-head centrifugal compressor unit as described in claim 6, characterized in that, The first heat source outlet is equipped with a first oil flow control device and / or a first oil filter; And / or, the second heat source outlet is provided with a second oil flow control device and / or a second oil filter.

9. The dual-head centrifugal compressor unit as described in claim 1, characterized in that, The dual-head centrifugal compressor unit, based on plate heat exchanger heat recovery and multi-oil circulation system, also includes a third oil flow control device. The third oil flow control device is located at the outlet of the first oil pump and is used to control the oil flow rate flowing out of the outlet of the first oil pump. And / or, the dual-head centrifugal compressor unit based on plate heat exchanger heat recovery and multi-oil circulation system further includes a fourth oil flow control device, which is located at the outlet of the second oil pump and is used to control the oil flow rate flowing out of the outlet of the second oil pump.

10. The dual-head centrifugal compressor unit as described in claim 1, characterized in that, The first heat exchanger is a plate heat exchanger; And / or, the second heat exchanger is a plate heat exchanger.

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