Lubricating oil cooling and water replenishing system of heat pump centrifugal machine, compressor and water replenishing and preheating method

Abstract

The invention relates to a lubricating oil cooling and water supplementing system of a heat pump centrifugal machine, a compressor and a water supplementing and preheating method. The lubricating oil cooling and water supplementing system of the heat pump centrifugal machine comprises the compressor, a steam generator connected with an outlet of the compressor and an evaporator connected with an inlet of the compressor. The system further comprises a pneumatic pump and a heat exchanger, the pneumatic pump comprises a driving impeller and a driven impeller coaxially connected with the driving impeller, and the upstream end of the driving impeller is connected with the steam generator through a high-temperature steam conveying pipeline so that high-temperature steam can serve as a driving source of the pneumatic pump. The upstream end of the driven impeller is connected with a liquid refrigerant pipeline of the evaporator, so that the pressure of a liquid refrigerant in the evaporator is increased; the heat exchanger is connected between the driven impeller and the steam generator, the heat exchanger is connected between the driven impeller and the evaporator, the heat exchanger is further used for receiving supplemented water and lubricating oil, and in the heat exchanger, a refrigerant exchanges heat with the lubricating oil, so that the temperature of the lubricating oil is reduced.

Description

Technical Field

[0001] This application relates to the field of high-temperature heat pump centrifuge systems, and particularly to a lubricating oil cooling and water replenishing system for a heat pump centrifuge, a compressor, and a water replenishing and preheating method. Background Art

[0002] In the lubricating oil cooling and water replenishing system of a heat pump centrifuge, due to the high steam temperature at the outlet of the steam generator (greater than 100 °C), it poses challenges to the cooling of components such as the unit's lubricating oil system. The traditional method of taking high-temperature and high-pressure liquid refrigerant from the steam generator and throttling it for cooling is difficult to reduce the temperature of components such as the lubricating oil system to an ideal range after throttling because the temperature of the liquid refrigerant in the steam generator itself is relatively high (greater than 100 °C), which easily leads to over-temperature shutdown and high oil temperature alarm, directly affecting the reliable operation of the system and even causing the system to malfunction.

[0003] Meanwhile, in the lubricating oil cooling and water replenishing system of a heat pump centrifuge, since the steam generator continuously produces high-temperature and high-pressure steam, water needs to be continuously replenished into the steam generator. Conventionally, municipal normal-temperature water is used for replenishment. Due to the relatively low temperature of municipal water (25 °C), directly replenishing it into the steam generator causes the temperature in the steam generator to drop sharply, resulting in intermittent steam production by the unit and affecting the use of end-users. Summary of the Invention

[0004] This application provides a lubricating oil cooling and water replenishing system for a heat pump centrifuge, a compressor, and a water replenishing and preheating method to solve the technical problems of over-temperature shutdown or high oil temperature alarm (difficult cooling of components such as the lubricating oil cooling and water replenishing system of a heat pump centrifuge) in the above-mentioned prior art, improve the operational reliability of the unit, and ensure the continuous and stable production of high-temperature steam by the unit.

[0005] The present invention provides a lubricating oil cooling and water replenishing system for a heat pump centrifuge, including: a compressor, a steam generator connected to the outlet of the compressor, and an evaporator connected to the inlet of the compressor; further including: a pneumatic pump and a heat exchanger. The pneumatic pump includes a driving impeller and a passive impeller coaxially connected to the driving impeller. The upstream end of the driving impeller is connected to the steam generator through a high-temperature steam delivery pipeline, so that high-temperature water vapor serves as the driving source of the pneumatic pump; the upstream end of the passive impeller is connected to the liquid refrigerant pipeline of the evaporator, so that the liquid refrigerant in the evaporator is pressurized; the heat exchanger is connected between the passive impeller and the steam generator, the heat exchanger is connected between the passive impeller and the evaporator, and the heat exchanger is also used to receive water replenishment and lubricating oil. Inside the heat exchanger, the refrigerant exchanges heat with the lubricating oil to reduce the temperature of the lubricating oil.

[0006] Among them, the lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: an oil pump with an oil tank and a cooling throttle valve. The cooling throttle valve is connected between the steam generator and the heat exchanger, and the oil pump is connected in a cycle between the upstream end and the downstream end of the compressor.

[0007] Among them, the lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: a secondary plate heat exchanger. The secondary plate heat exchanger is connected between the oil pump and the upstream end of the compressor, and the cooling throttle valve is connected between the secondary plate heat exchanger and the heat exchanger.

[0008] Among them, the upstream end of the heat exchanger is connected to a water replenishing pump with a water replenishing tank.

[0009] Among them, the lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: a mixing water tank. The mixing water tank is connected between the heat exchanger and the steam generator, so that the replenished water is preheated and then mixed with the high-temperature steam after driving the pneumatic pump in the mixing water tank, and the fully preheated replenished water enters the steam generator.

[0010] Among them, the mixing water tank is connected between the upstream ends of the heat exchanger and the steam generator. At the same time, the mixing water tank is connected between the downstream end of the driving impeller and the upstream end of the steam generator.

[0011] Among them, the downstream end of the steam generator is connected to the upstream end of the evaporator through a primary throttle valve and a secondary throttle valve in sequence.

[0012] Among them, a flash tank is connected between the primary throttle valve and the secondary throttle valve.

[0013] The present invention also provides a compressor, and the compressor includes the above-mentioned lubricating oil cooling and water replenishing system of the heat pump centrifuge.

[0014] The present invention also provides a method for preheating water replenishment, which applies the above-mentioned lubricating oil cooling and water replenishing system of the heat pump centrifuge. The method includes: Obtain high-temperature and high-pressure water vapor in the steam generator; Act on the pneumatic pump with the high-temperature and high-pressure water vapor, so that the pneumatic pump is started, and the liquid refrigerant in the evaporator is boosted in pressure, and the liquid refrigerant is pumped to the heat exchanger. In the heat exchanger, the replenished water and the liquid refrigerant are preheated once to obtain a mixed liquid; Control the mixed liquid to flow to the mixing water tank. At the same time, control the high-temperature and high-pressure water vapor to flow to the mixing water tank through the pneumatic pump. In the mixing water tank, the replenished water after the first preheating is mixed with the high-temperature and high-pressure water vapor for secondary preheating, and then flows back to the steam generator.

[0015] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art: The heat pump centrifuge lubricating oil cooling and water replenishing system, compressor and water replenishing and preheating method provided by the embodiments of the present application can drive a pneumatic pump with high-temperature water vapor in a steam generator to boost the pressure of the liquid refrigerant in the evaporator, and can directly solve the problem that the high-temperature steam heat pump centrifuge system cannot use the pressure difference to boost the pressure of the liquid refrigerant in the evaporator. At the same time, the refrigerant exchanges heat with the lubricating oil in the heat exchanger, which can reduce the temperature of the lubricating oil. Description of the Drawings

[0016] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the drawings in the drawings do not constitute a proportional limitation.

[0019] Figure 1 It is a schematic structural diagram of the heat pump centrifuge lubricating oil cooling and water replenishing system provided by the embodiments of the present application.

[0020] Description of the Reference Numerals in the Drawings 1. Oil tank; 2. Oil pump; 3. Heat exchanger; 4. Evaporator; 5. Compressor; 6. Heat source inlet water; 7. Heat source outlet water; 8. Gas supply pipe; 9. Steam outlet control valve; 11. Secondary throttle valve; 12. Flash tank; 13. Primary throttle valve; 14. Steam generator; 15. Water replenishing pump; 16. Water replenishing tank; 17. Municipal water inlet valve; 20. Pneumatic pump; 21. Driving impeller; 22. Driven impeller; 23. Secondary plate heat exchanger; 24. Cooling throttle valve; 25. Mixing tank. Detailed Embodiments

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will describe the technical solutions in the embodiments of this application clearly and completely with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0022] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0023] For ease of description, spatially relative relationship terms may be used in the text to describe the relative position relationship or movement of one element or feature shown in the figure relative to another element or feature. These relative relationship terms such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "upper", "front", "rear", etc. This spatially relative relationship term is intended to include different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip, attitude change, or motion state change, then these directional indications will change accordingly. For example, an element described as "below other elements or features" or "beneath other elements or features" will subsequently be oriented as "above other elements or features" or "on other elements or features". Therefore, the exemplary term "below" can include both the upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other directions) and the spatially relative relationship descriptions used in the text have been interpreted accordingly.

[0024] The existing high-temperature steam heat pump centrifugal system mainly includes a compressor, an evaporator, a steam generator (i.e., a steam generator), a flasher, a water supply tank, a primary throttle valve, a secondary throttle valve, an oil tank and an oil pump. After the compressor compresses the refrigerant vapor in the evaporator, it forms a high-temperature and high-pressure gaseous refrigerant, which enters the evaporation condenser of the steam generator. The high-temperature and high-pressure gaseous refrigerant exchanges heat with the make-up water from the water supply tank through the evaporation condenser. The make-up water vaporizes into high-temperature and high-pressure water vapor, which is supplied to the back-end user by the steam outlet control valve. The gaseous refrigerant in the evaporation condenser is condensed into liquid refrigerant, which enters the evaporator after being throttled by the primary throttle valve, the flasher and the secondary throttle valve. In the evaporator, the liquid refrigerant evaporates into gaseous state, takes away the heat of the heat source water in the evaporation tube, and then is compressed by the compressor to enter the next refrigeration cycle. The oil tank and the oil pump provide lubricating oil for the compressor bearings to ensure that the bearings are fully lubricated and take away the heat of the bearings.

[0025] In the high-temperature steam heat pump centrifugal system, the traditional cooling method for lubricating oil is: take high-temperature and high-pressure liquid refrigerant from the steam generator, throttle through the cooling throttle valve, and enter the plate heat exchanger. The refrigerant exchanges heat with the lubricating oil from the oil pump to reduce the temperature of the lubricating oil, and then supplies it to the compressor bearing. The gaseous refrigerant evaporates in the plate heat exchanger and returns to the evaporator. In this method, due to the high temperature and high pressure refrigerant in the evaporative condenser, the temperature is relatively high (greater than 100°C), resulting in the refrigerant temperature being still relatively high (generally greater than 70°C after throttling) after throttling through the cooling throttle valve, and cannot be significantly reduced, which ultimately results in the inability to effectively reduce the lubricating oil temperature in the plate heat exchanger (the required temperature of the lubricating oil is generally not greater than 60°C), which is prone to over-temperature shutdown and oil temperature alarm, which directly affects the reliable operation of the system.

[0026] To alleviate the above problems, refer to Figure 1 The embodiment of the present application provides a high-temperature steam heat pump centrifuge system that can smoothly perform cooling and water replenishment. The pneumatic pump 20 is driven by high-temperature water vapor to increase the pressure of the liquid refrigerant in the evaporator 4, and exchange heat with the normal-temperature make-up water to obtain supercooling, and then exchange heat with the cooled object after throttling to achieve an ideal cooling effect; at the same time, the make-up water is preheated for the first time, and then mixed with the high-temperature steam after driving the pneumatic pump 20 in the mixing water tank 25 to further increase the make-up water temperature. The fully preheated make-up water then enters the steam generator 14 to ensure that the unit continuously and stably produces high-temperature steam.

[0027] The specific instructions are as follows: In a high-temperature steam heat pump centrifuge system, the traditional water replenishment method is as follows: Municipal normal-temperature water (25°C) is taken from the municipal water inlet valve 17 as makeup water, stored in the makeup water tank 16, and after passing through the makeup water pump 15, the normal-temperature makeup water is pumped into the steam generator 14. In the steam generation process, the makeup water is vaporized into high-temperature and high-pressure water steam and supplied to the downstream customers. In this method, since the temperature of the makeup water is normal temperature, a large amount of heat is required to vaporize it into high-temperature steam, which causes the temperature in the steam generator 14 to drop sharply, resulting in intermittent steam output from the unit and affecting the use of downstream users.

[0028] The embodiment of the present application provides a lubricating oil cooling and makeup water system for a heat pump centrifuge, including: a compressor 5, a steam generator 14 connected to the outlet of the compressor 5, and an evaporator 4 connected to the inlet of the compressor 5; further including: a pneumatic pump 20 and a heat exchanger 3. The pneumatic pump 20 includes a driving impeller 21 and a passive impeller 22 coaxially connected to the driving impeller 21. The upstream end of the driving impeller 21 is connected to the steam generator 14 through a high-temperature steam delivery pipeline, so that high-temperature water steam serves as the driving source of the pneumatic pump 20; the upstream end of the passive impeller 22 is connected to the liquid refrigerant pipeline of the evaporator 4 to boost the pressure of the liquid refrigerant in the evaporator 4; the heat exchanger 3 is connected between the passive impeller 22 and the steam generator 14, and the heat exchanger 3 is connected between the passive impeller 22 and the evaporator 4. The heat exchanger 3 is also used to receive makeup water and lubricating oil. Inside the heat exchanger 3, the refrigerant exchanges heat with the lubricating oil to reduce the temperature of the lubricating oil.

[0029] In this way, the high-temperature water steam in the steam generator 14 can be used to drive the pneumatic pump 20 to boost the pressure of the liquid refrigerant in the evaporator 4, which can directly solve the problem that the liquid refrigerant in the evaporator 4 of the high-temperature steam heat pump centrifuge system cannot be boosted by using the pressure difference. At the same time, the refrigerant exchanges heat with the lubricating oil in the heat exchanger 3, which can reduce the temperature of the lubricating oil.

[0030] Specifically, the high-temperature water steam generated by the steam generator 14 is used to drive the driving impeller 21 of the pneumatic pump 20, which cleverly converts the energy of the steam into mechanical energy, drives the passive impeller 22 coaxially connected to the driving impeller 21 to rotate, and then realizes the boosting of the liquid refrigerant in the evaporator 4. This process is not only efficient but also completely avoids the technical bottleneck that the liquid refrigerant in the traditional high-temperature steam heat pump centrifuge system cannot be effectively boosted due to insufficient pressure difference. At the same time, through the full heat exchange between the refrigerant and the lubricating oil in the heat exchanger 3, the temperature of the lubricating oil can be accurately and stably controlled, effectively avoiding problems such as increased wear of the compressor 5 and decreased system efficiency caused by too high lubricating oil temperature, greatly improving the operation stability and reliability of the entire heat pump centrifuge system, extending the service life of the equipment, reducing the maintenance cost, and significantly improving the energy efficiency ratio of the system, achieving the goal of energy-saving and high-efficiency operation.

[0031] Exemplarily, the pneumatic pump 20 can be replaced by an electric pump. The electric pump is driven by a motor and converts electrical energy into mechanical energy to achieve the boosting of the liquid refrigerant.

[0032] Considering the supply scheme of lubricating oil in the system, in the lubricating oil cooling and water replenishing system of the heat pump centrifuge provided by the embodiments of the present application, the lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: an oil pump 2 with an oil tank 1 and a cooling throttle valve 24. The cooling throttle valve 24 is connected between the steam generator 14 and the heat exchanger 3, and the oil pump 2 is circularly connected between the upstream end and the downstream end of the compressor 5.

[0033] In this lubricating oil cooling and water replenishing system of the heat pump centrifuge, the oil pump 2 builds a circulation channel for lubricating oil between the upstream end and the downstream end of the compressor 5 by means of its own power. When the system operates, the oil pump 2 continuously pumps out the lubricating oil in the oil tank 1, making it flow through each key part of the compressor 5 to lubricate, cool and seal the compressor 5. At the same time, the cooling throttle valve 24 is installed between the steam generator 14 and the heat exchanger 3, and its main function is to regulate the fluid flow rate and pressure flowing from the steam generator 14 to the heat exchanger 3. When the fluid generated by the steam generator 14 flows through the cooling throttle valve 24, the cooling throttle valve 24 realizes the throttling and pressure reduction of the fluid by changing its own flow cross-sectional area, ensuring that the fluid entering the heat exchanger 3 is in a suitable parameter state, so as to ensure the stable and efficient heat exchange process between the refrigerant and the lubricating oil in the heat exchanger 3.

[0034] In this way, the circular connection of the oil pump 2 with the upstream and downstream of the compressor 5 can provide continuous and stable lubrication for the compressor 5, effectively reduce the frictional loss between the components of the compressor 5, reduce the wear degree, and significantly improve the service life and operation reliability of the compressor 5. The precise regulation of the fluid between the steam generator 14 and the heat exchanger 3 by the cooling throttle valve 24, on the one hand, can optimize the heat exchange condition in the heat exchanger 3, ensure full heat exchange between the refrigerant and the lubricating oil, and improve the cooling effect of the lubricating oil; on the other hand, reasonable throttling and pressure reduction helps to maintain the balance of the internal pressure of the system, reduce the energy loss caused by pressure fluctuation, improve the operation stability and energy efficiency ratio of the entire heat pump centrifuge system, and at the same time avoid damage to the heat exchanger 3 and other components caused by excessive pressure, ensuring the safe and stable operation of the system.

[0035] Combined with the application of the aforementioned pneumatic pump 20 and the heat exchanger 3, the following effects can be further achieved: The lubricating oil cooling and water replenishing system of this heat pump centrifuge realizes multi-dimensional technical improvements through the coordinated cooperation of the oil pump 2, the cooling throttle valve 24, the pneumatic pump 20, and the heat exchanger 3. The oil pump 2 constructs a lubricating oil circulation channel between the upstream and downstream of the compressor 5, continuously providing stable lubrication for the compressor 5, effectively reducing component wear, and extending the service life of the equipment; the cooling throttle valve 24 precisely adjusts the fluid parameters of the steam generator 14 flowing to the heat exchanger 3, and cooperates with the pneumatic pump 20 to drive the liquid refrigerant to boost pressure using high-temperature steam, and the heat exchanger 3 realizes the efficient heat exchange between the refrigerant and the lubricating oil. This not only ensures that the lubricating oil is fully cooled within the system but also optimizes the pressure balance and energy transmission of the entire system, reduces energy losses caused by pressure fluctuations and low heat exchange efficiency, significantly improves the operating stability, reliability, and energy efficiency ratio of the heat pump centrifuge system, while ensuring that each component operates under suitable working conditions, reducing maintenance costs, and enhancing the overall performance of the system.

[0036] Considering the specific heat exchange solution, in the lubricating oil cooling and water replenishing system of the heat pump centrifuge provided by the embodiments of the present application, the lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: a secondary plate heat exchanger 23, the secondary plate heat exchanger 23 is connected between the upstream end of the oil pump 2 and the compressor 5, and the cooling throttle valve 24 is connected between the secondary plate heat exchanger 23 and the heat exchanger 3.

[0037] It can be understood that in this lubricating oil cooling and water replenishing system of the heat pump centrifuge, the secondary plate heat exchanger 23 is a key heat exchange component. Exemplarily, the secondary plate heat exchanger 23 is composed of a series of corrugated metal sheets stacked together, and multiple independent fluid channels are formed between the plates. When the oil pump 2 pumps out the lubricating oil from the oil tank 1 and transports it to the secondary plate heat exchanger 23, the lubricating oil flows in a group of channels of the secondary plate heat exchanger 23; at the same time, the fluid flowing out of the cooling throttle valve 24 and preliminarily adjusted enters another group of channels of the secondary plate heat exchanger 23. Due to the good heat conductivity of the plates, the fluids in the two groups of channels exchange heat through the plates, and the lubricating oil is preliminarily cooled in this process. Subsequently, the lubricating oil preliminarily cooled by the secondary plate heat exchanger 23 then flows to the upstream end of the compressor 5, while the fluid that has completed heat exchange in the other group of channels continues to flow to the heat exchanger 3 for subsequent in-depth heat exchange, thereby realizing the hierarchical cooling treatment of the lubricating oil in the entire system.

[0038] In this way, the unique corrugated plate structure of the secondary plate heat exchanger 23 greatly increases the heat exchange area, enhances the turbulence degree of the fluid at the same time, significantly improves the heat exchange efficiency, enables the lubricating oil to achieve effective cooling in a short time, reduces the heat exchange burden of the subsequent heat exchanger 3, and ensures the heat exchange effect of the entire system. In addition, the layout of the secondary plate heat exchanger 23 connected between the upstream ends of the oil pump 2 and the compressor 5 and between the cooling throttle valve 24 and the heat exchanger 3 realizes the staged cooling of the lubricating oil, allowing the lubricating oil to be preliminarily cooled before entering the compressor 5, reducing the adverse effects of high-temperature lubricating oil on the compressor 5, and improving the operation stability and reliability of the compressor 5; at the same time, the heat exchange in the system is reasonably distributed, the energy utilization efficiency of the system is optimized, the energy consumption is reduced, and it is convenient to perform separate maintenance and cleaning on the secondary plate heat exchanger 23 according to the actual working conditions, effectively avoiding the influence on the overall performance of the system due to the decrease in heat exchange efficiency. Considering the scheme of the water replenishment path passing through the heat exchanger 3, in the heat pump centrifuge lubricating oil cooling and water replenishment system provided by the embodiment of the present application, the upstream end of the heat exchanger 3 is connected to a water replenishment pump 15 with a water replenishment tank 16.

[0039] In this way, the water replenishment pump 15 can stably transport the water in the water replenishment tank 16 to the heat exchanger 3. On the one hand, the replenished water participates in the heat exchange process in the heat exchanger 3, acts together with the lubricating oil and the refrigerant, increases the heat exchange capacity of the heat exchange medium, and improves the heat exchange efficiency of the heat exchanger 3, enabling the lubricating oil to be cooled more fully; on the other hand, the stable water replenishment can maintain the total amount balance of the heat exchange medium in the system, avoid the decline of the system heat exchange performance due to factors such as water evaporation, and ensure the long-term stable operation of the system. In addition, combined with the pneumatic pump 20 using steam to drive the liquid refrigerant to boost pressure and the efficient heat exchange function of the heat exchanger 3 itself, the entire system further optimizes the energy transfer efficiency, reduces the energy consumption, ensures that key components such as the compressor 5 work in a good lubrication and cooling environment, and prolongs the service life of the equipment.

[0040] Exemplarily, gravity water replenishment can be considered to replace the water replenishment by the water replenishment pump 15. The water replenishment tank 16 can be installed at a position higher than the heat exchanger 3, and the water flows into the heat exchanger 3 naturally by the gravity action generated by the water level difference. In this way, no additional power equipment is required, the equipment cost and operation energy consumption are reduced, and at the same time, the risk of abnormal system water replenishment caused by the failure of the water replenishment pump 15 is reduced, improving the stability of the system. A smart variable-frequency water replenishment device can also be introduced to replace the traditional water replenishment pump 15. The smart variable-frequency water replenishment device can monitor the water replenishment demand of the system in real time according to parameters such as the temperature and pressure in the heat exchanger 3, and automatically adjust the water replenishment flow through variable-frequency technology to achieve precise water replenishment. Compared with the water replenishment pump 15 with a fixed flow rate, it can not only avoid water waste caused by excessive water replenishment and system pressure fluctuations, but also prevent insufficient water replenishment from affecting the heat exchange effect, further improving the intelligent and energy-saving level of the system.

[0041] Considering the solution of increasing preheating, in the lubricating oil cooling and water replenishing system of the heat pump centrifuge provided by the embodiment of the present application, it includes: a mixing water tank 25, and the mixing water tank 25 is connected between the heat exchanger 3 and the steam generator 14, so that the replenished water is preheated and then mixed with the high-temperature steam after driving the pneumatic pump 20 in the mixing water tank 25, and the replenished water after sufficient preheating enters the steam generator 14.

[0042] In this way, by arranging the mixing water tank 25 between the heat exchanger 3 and the steam generator 14, efficient preheating of the replenished water is achieved. The replenished water first absorbs part of the heat in the heat exchanger 3 to complete preliminary preheating, and then enters the mixing water tank 25 to be mixed with the high-temperature steam after driving the pneumatic pump 20. The waste heat of the high-temperature steam is fully utilized, enabling the replenished water to be further heated. The replenished water after sufficient preheating enters the steam generator 14, which can significantly reduce the energy consumption of the steam generator 14 for heating water to the required temperature and improve the energy utilization efficiency. At the same time, this preheating method makes the temperature of the replenished water entering the steam generator 14 more stable, which helps the steam generator 14 to operate stably and reduces the problems of unstable steam output and quality caused by fluctuations in the replenished water temperature. In addition, combined with the use of the pneumatic pump 20 to boost the pressure of the liquid refrigerant with high-temperature steam and the cooling function of the heat exchanger 3 for lubricating oil, the energy cycle of the entire system is smoother, the collaborative working efficiency of each component is improved, further ensuring the stability and reliability of the operation of the heat pump centrifuge system and extending the service life of the equipment.

[0043] Exemplarily, a tubular preheater can be used to replace the mixing water tank 25 for preheating the replenished water. The tubular preheater consists of multiple heat exchange tubes. The replenished water flows inside the tubes, and the high-temperature steam after driving the pneumatic pump 20 flows outside the tubes, and heat exchange is carried out through the tube walls. This method can achieve a large heat exchange area, improve the preheating efficiency, and the tubular structure is convenient for installation and maintenance, and the number and length of the heat exchange tubes can be adjusted according to actual needs.

[0044] Exemplarily, a waste heat recovery heat pump system can be used to preheat the replenished water. The waste heat recovery heat pump system can more accurately recover the waste heat of the high-temperature steam after driving the pneumatic pump 20 and transfer the heat to the replenished water through the heat pump cycle. Compared with the direct mixing method, this system can more flexibly control the preheating temperature of the replenished water to meet the requirements under different working conditions. At the same time, the energy efficiency ratio of the waste heat recovery heat pump system is relatively high, which can further reduce the energy consumption of the system and improve the overall energy-saving effect.

[0045] Considering the installation scheme of the mixing water tank 25, in the lubricating oil cooling and water replenishing system of the heat pump centrifuge provided by the embodiment of the present application, the mixing water tank 25 is connected between the upstream ends of the heat exchanger 3 and the steam generator 14. At the same time, the mixing water tank 25 is connected between the downstream end of the driving impeller 21 and the upstream end of the steam generator 14.

[0046] In this way, the make-up water flowing out of the heat exchanger 3 can be fully mixed with the high-temperature steam after driving the pneumatic pump 20 in the mixing water tank 25, and the make-up water is preheated by using the waste heat of the steam, significantly reducing the energy consumption required for the steam generator 14 to heat the water to the working temperature subsequently, and improving the energy utilization rate. In addition, this layout makes the heat transfer path of the whole system more reasonable, effectively utilizes the waste heat generated by the pneumatic pump 20 and the heat exchanger 3 through the mixing water tank 25, realizes the recycling of energy, and further optimizes the energy efficiency of the heat pump centrifuge system. In addition, the make-up water after stable preheating enters the steam generator 14, which helps to maintain the stability of the operating conditions of the steam generator 14, reduces the problems of unstable steam output and quality caused by the temperature fluctuation of the make-up water, ensures the continuous and efficient operation of the system, and prolongs the service life of the equipment.

[0047] Exemplarily, the mixing water tank 25 can be replaced with a spiral-wound preheater and installed at the same position. The spiral-wound preheater increases the contact area and residence time of the fluid through the spiral structure, enabling the high-temperature steam after driving the pneumatic pump 20 to achieve more sufficient heat exchange with the make-up water from the heat exchanger 3 in a smaller space, improving the preheating efficiency, and its compact structure is convenient for installation and space layout.

[0048] Exemplarily, a segmented preheating pipeline can be used to replace the mixing water tank 25. The pipeline connecting the heat exchanger 3, the pneumatic pump 20 and the steam generator 14 is designed to be segmented, and a plurality of heat exchange fins or heat-conducting media are arranged on the pipeline, so that the make-up water gradually absorbs the waste heat of the high-temperature steam after driving the pneumatic pump 20 during the flowing process, realizing the preheating effect. This method does not require an additional large container, reduces the equipment cost and space occupation, and at the same time, by adjusting the pipeline length and the number of fins, it can flexibly adapt to the preheating requirements under different working conditions.

[0049] Considering the application scheme of the throttle valve in the system, in the heat pump centrifuge lubricating oil cooling make-up water system provided by the embodiment of the present application, the downstream end of the steam generator 14 is sequentially connected to the upstream end of the evaporator 4 through a primary throttle valve 13 and a secondary throttle valve 11.

[0050] In this way, the downstream end of the steam generator 14 is sequentially connected to a primary throttle valve 13 and a secondary throttle valve 11, which cooperate with the pneumatic pump 20 and the heat exchanger 3. The series arrangement of the primary throttle valve 13 and the secondary throttle valve 11 achieves two-stage precise pressure reduction and throttling of the fluid flowing out of the steam generator 14, enabling the fluid to enter the evaporator 4 at an appropriate pressure and flow rate, ensuring the stable and efficient operation of the evaporator 4. At the same time, the working load of a single throttle valve is reduced, and the service life of the throttle valve is extended. Combining the function of the pneumatic pump 20 to boost the pressure of the liquid refrigerant using high-temperature steam and the heat exchanger 3 to cool the lubricating oil, the application of the two-stage throttle valve optimizes the pressure distribution and energy transfer within the system, effectively avoiding problems such as system vibration, noise, and component damage caused by sudden pressure changes, ensuring the stability and reliability of system operation, and further improving the overall energy efficiency and working efficiency of the lubricating oil cooling and water replenishing system of the heat pump centrifuge.

[0051] Exemplarily, a variable-frequency speed-regulating pump can be used to replace the primary throttle valve 13 and the secondary throttle valve 11. The variable-frequency speed-regulating pump can flexibly control the flow rate and pressure of the fluid by adjusting the motor speed according to the actual system requirements. Compared with the throttle valve, it has higher adjustment accuracy, can avoid energy loss during the throttling process, and improve the energy-saving effect of the system; at the same time, it reduces the possible problems such as blockage and wear of the throttle valve, and reduces the system maintenance cost.

[0052] Exemplarily, an adjustable Venturi tube can be used to replace the throttle valve. The adjustable Venturi tube adjusts the flow rate and pressure of the fluid by changing the cross-sectional area of the throat. It has the characteristics of simple structure and convenient adjustment, and can effectively reduce the pressure loss of the fluid during the adjustment process, improving the energy utilization efficiency of the system; in addition, the Venturi tube is not easily affected by impurities in the fluid, is more wear-resistant than the throttle valve, can adapt to complex working conditions, and improves the adaptability and stability of the system.

[0053] Considering the scheme of gas-liquid separation and pressure regulation, in the lubricating oil cooling and water replenishing system of the heat pump centrifuge provided in the embodiment of the present application, a flash tank 12 is connected between the primary throttle valve 13 and the secondary throttle valve 11.

[0054] In this way, the flash evaporator 12 can separate the liquid refrigerant after the pressure reduction by the first-stage throttle valve 13 into gas and liquid, avoiding the mixing of gaseous refrigerant into the liquid refrigerant and affecting the throttling effect of the second-stage throttle valve 11, ensuring that the second-stage throttle valve 11 can accurately reduce the pressure with a more stable liquid refrigerant as the object, making the pressure and flow rate of the refrigerant entering the evaporator 4 more in line with the design requirements, and improving the heat exchange efficiency of the evaporator 4. At the same time, the separated gaseous refrigerant can be used as an additional heat source to preheat the makeup water synergistically with the high-temperature steam discharged by the pneumatic pump 20 in the mixing water tank 25, or assist the heat exchanger 3 to heat the lubricating oil, fully recovering and utilizing the energy, and further improving the system energy efficiency. In addition, the flash evaporator 12 alleviates the pressure fluctuation during the throttling process, forms a cooperation with the stable pressure boost of the pneumatic pump 20 and the efficient heat exchange of the heat exchanger 3, ensures the stability of the refrigerant circulation in the system, reduces the component loss caused by pressure mutation, and prolongs the service life of the equipment.

[0055] Exemplarily, the gas-liquid separation can also be achieved by a gas-liquid separation tank through gravity sedimentation and an internal baffle structure. The liquid refrigerant is transported to an expansion valve for throttling, and the gaseous refrigerant is recovered and utilized separately.

[0056] Exemplarily, a cyclone gas-liquid separator can also be applied. The cyclone gas-liquid separator uses centrifugal force to quickly separate gas and liquid, with high separation efficiency and small occupied space, and is particularly suitable for scenarios with high requirements for system compactness.

[0057] Furthermore, in the lubricating oil cooling and makeup water system of the heat pump centrifuge provided in the embodiment of the present application, it further includes a heat source inlet water 6 and a heat source outlet water 7. Among them, the heat source inlet water 6 usually comes from a low-temperature heat source (such as industrial wastewater, waste heat flue gas, geothermal energy, etc.), and its function is to bring the low-temperature heat energy from the outside into the heat pump system. For example, in an industrial scenario, the heat source inlet water 6 may be the high-temperature wastewater generated during the production process (but still belongs to "low temperature" relative to the temperature that the heat pump needs to raise), and the heat carried by the water will be extracted and upgraded by the heat pump.

[0058] Exemplarily, in the evaporator 4 section of the heat pump system, the heat source inlet water 6 exchanges heat with the refrigerant. The refrigerant absorbs the heat of the heat source inlet water 6 in the evaporator 4 and evaporates from liquid to gas, realizing the extraction of low-temperature heat energy; the heat source inlet water 6 is cooled due to the heat being taken away and becomes the "heat source outlet water 7", and then is discharged from the system or recycled.

[0059] Exemplarily, the heat source outlet water 7 is the product after the heat source inlet water 6 releases heat. Its temperature is already lower than the inlet water, and the remaining heat carried has been extracted by the heat pump system. The discharged heat source outlet water 7 can be further processed according to requirements (such as direct discharge, recycling to the production process, or secondary heat exchange) to avoid waste of the remaining heat.

[0060] In summary, taking the liquid supply waste heat recovery scenario as an example, the heat source inlet water 6 carries the low-temperature heat energy of industrial wastewater into the evaporator 4 and exchanges heat with the refrigerant; the refrigerant absorbs heat and evaporates, and after being compressed by the compressor 5, it becomes a high-temperature and high-pressure gas and enters the condenser; in the condenser, the high-temperature refrigerant releases heat to the medium to be heated (such as heating water, production process hot water), and itself liquefies; the heat source outlet water 7 after releasing heat is discharged from the system, and the heated medium is used for actual needs.

[0061] Furthermore, in the lubricating oil cooling and water replenishing system of the heat pump centrifuge provided by the embodiment of the present application, there is also a gas supplement pipe 8. The gas supplement pipe 8 can introduce additional refrigerant gas into the intermediate stage of the compressor 5 when the system is operating at low load, effectively increasing the gas flow rate in the impeller, thereby avoiding the surge problem caused by insufficient flow rate and ensuring the stable operation of the compressor 5; it can also extract medium-temperature and medium-pressure refrigerant gas from the evaporator 4 or the intermediate heat exchanger 3 through the "gas supplement and enthalpy increase" mechanism and inject it into the intermediate stage of the compressor 5. After mixing with the refrigerant in the main circuit, it continues to be compressed, significantly increasing the total heat released by the refrigerant in the condenser and enhancing the heating capacity of the system; according to the fluctuations of the heat source temperature or heat load, the gas supplement amount is dynamically adjusted through a valve to accurately match the system load demand. For example, when the heat source temperature decreases, the gas supplement amount is increased to maintain the condensation temperature, and when the heat load increases, the gas supplement amount is decreased to avoid overloading of the compressor 5. In addition, the gas supplement pipe 8 can also prevent "liquid hammer" caused by too low suction pressure of the compressor 5 under low-temperature heat source conditions, reduce the exhaust temperature under high-temperature conditions to avoid carbonization of the lubricating oil, and at the same time reduce equipment vibration and noise by suppressing surges, extend the service life of the unit, and ultimately improve the energy efficiency ratio of the system.

[0062] Furthermore, in the lubricating oil cooling and water replenishing system of the heat pump centrifuge provided by the embodiment of the present application, there is also a steam outlet control valve 9. This valve can dynamically adjust the steam flow rate at the outlet of the compressor 5 according to the system load. For example, when the heat load decreases, the valve automatically reduces the opening to reduce the amount of steam entering the condenser and avoid overloading of the compressor 5 caused by too high condensation pressure. When the heat load increases, the opening is increased to ensure that the refrigerant circulation amount matches the heating demand; by controlling the steam outlet pressure, the valve can effectively maintain the condensation temperature in the condenser. Especially when the heat source temperature fluctuates, the condensation pressure can be stabilized within the design range by adjusting the valve opening to prevent a decrease in heat exchange efficiency or equipment damage caused by abnormal pressure; in addition, the steam outlet control valve 9 also has a safety protection function. When the system has overpressure due to a fault, the valve can quickly open to relieve the pressure and avoid safety accidents of the compressor 5 or the condenser due to excessive pressure.

[0063] The embodiment of the present application also provides a compressor 5, and the compressor 5 includes the above-mentioned lubricating oil cooling and water replenishing system of the heat pump centrifuge. All the effects of the lubricating oil cooling and water replenishing system of the heat pump centrifuge can be obtained.

[0064] The embodiment of the present application also provides a water replenishment and preheating method, which is applied to the above-mentioned heat pump centrifuge lubricating oil cooling and water replenishment system. The method includes: Obtain the high-temperature and high-pressure water vapor in the steam generator 14; Apply the high-temperature and high-pressure water vapor to the pneumatic pump 20 to start the pneumatic pump 20, boost the pressure of the liquid refrigerant in the evaporator 4, pump the liquid refrigerant into the heat exchanger 3, and in the heat exchanger 3, the water replenishment and the liquid refrigerant are preheated once to obtain a mixed liquid; Control the mixed liquid to flow to the mixing water tank 25. At the same time, control the high-temperature and high-pressure water vapor to flow to the mixing water tank 25 via the pneumatic pump 20. In the mixing water tank 25, the water replenishment after the first preheating and the high-temperature and high-pressure water vapor are mixed for secondary preheating, and then flow back to the steam generator 14.

[0065] First, the high-temperature and high-pressure water vapor of the steam generator 14 is used to drive the pneumatic pump 20, which cleverly converts the steam energy into the power for boosting the pressure of the liquid refrigerant. This not only solves the problem of difficult pressure boosting of the liquid refrigerant in the traditional system but also realizes the efficient utilization of energy. Second, in the heat exchanger 3, the liquid refrigerant and the water replenishment are preheated once, effectively utilizing the cold energy of the refrigerant and initially raising the temperature of the water replenishment. Third, in the mixing water tank 25, the water replenishment after the first preheating and the high-temperature and high-pressure water vapor passing through the pneumatic pump 20 are preheated a second time, further raising the temperature of the water replenishment, realizing the secondary recovery of the steam waste heat, and greatly reducing the energy consumption required for the steam generator 14 to reheat the water replenishment. In addition, the hierarchical preheating method makes the temperature of the water replenishment more uniform and stable, helps to maintain the stable operation of the steam generator 14, reduces the loss of the equipment caused by temperature fluctuations, and extends the service life of the system.

[0066] In summary, this water replenishment and preheating method achieves the dual goals of high efficiency and energy saving and stable operation by reasonably distributing and recycling the energy in the system. It not only optimizes the energy utilization rate of the heat pump centrifuge lubricating oil cooling and water replenishment system but also improves the overall reliability and stability of the system.

[0067] Based on the above heat pump centrifuge lubricating oil cooling and water replenishment system, compressor 5, and water replenishment and preheating method, a summary statement of the solution is as follows: In a high-temperature steam heat pump centrifuge system, a pneumatic pump 20, a mixing water tank 25, a secondary plate heat exchanger 23 and their connecting pipes are added. High-temperature and high-pressure water steam is taken from the steam generator 14 and supplied to the pneumatic pump 20 to drive the driving impeller 21 to rotate, thereby driving the driven impeller 22 to do work. After boosting the pressure of the liquid refrigerant (generally <80°C) in the evaporator 4, it is pumped into the plate heat exchanger 3. After driving the driving impeller 21, the high-temperature and high-pressure water steam enters the mixing water tank 25; in the plate heat exchanger 3, the normal-temperature makeup water exchanges heat with the liquid refrigerant from the evaporator 4. Due to the large heat exchange temperature difference, it is very easy for the liquid refrigerant to obtain supercooling (supercooling degree >30°C). After the supercooled liquid refrigerant passes through the cooling throttle valve 24 and is throttled, it enters the secondary plate heat exchanger 23. The supercooled and throttled liquid refrigerant exchanges heat and evaporates with the lubricating oil, which can effectively cool the lubricating oil to the target range, and the cooling effect is remarkable. The evaporated gaseous refrigerant returns to the evaporator 4; at the same time, after the normal-temperature makeup water exchanges heat with the liquid refrigerant from the evaporator 4 in the plate heat exchanger 3, it obtains the first preheating. After the temperature is increased (generally can be increased to 50°C), it enters the 25 - mixing water tank 25; in the mixing water tank 25, the makeup water with increased temperature is mixed with the high-temperature and high-pressure water steam, and the temperature is further increased (the temperature is increased to >80°C) for sufficient preheating, and then enters the steam generator 14. In the steam generator 14, due to the relatively high temperature of the makeup water after sufficient preheating, the heat required to vaporize it into high-temperature and high-pressure water steam is relatively reduced, and it will not sharply reduce the temperature in the steam generator 14, ensuring that the unit continuously and stably produces high-temperature water steam and improving the stability of the unit.

[0068] Furthermore, directly use the normal-temperature makeup water in the makeup water tank 16 to exchange heat with the refrigerant, so that the refrigerant obtains a large supercooling degree, and then throttles and exchanges heat with the object to be cooled, thereby achieving a remarkable cooling effect.

[0069] Furthermore, the normal-temperature makeup water from the makeup water tank 16 is effectively preheated twice, solving the stability problem of the high-temperature water steam output of the unit.

[0070] Furthermore, the makeup water pump 15 can also use the pneumatic pump 20, and is also driven by the high-pressure and high-temperature water steam in the steam generator 14. After driving, the high-temperature water steam also enters the mixing water tank 25 to preheat the makeup water.

[0071] Furthermore, the high-temperature liquid refrigerant driven by the pneumatic pump 20 comes from the evaporator 4 or can also come from the flash tank 12; the refrigerant that obtains supercooling and is throttled in the plate heat exchanger 3 exchanges heat with the object to be cooled in the secondary plate heat exchanger 23, or can also be directly throttled and sprayed into the gap between the motor rotor and stator to directly cool the rest of the components such as the motor.

[0072] An embodiment of the present application provides a cooling and water replenishing method for a high-temperature steam heat pump centrifuge system. The method drives a pneumatic pump 20 with high-temperature water vapor to boost the pressure of the liquid refrigerant in the evaporator 4, exchanges heat with normal-temperature water replenishment to obtain subcooling, and then exchanges heat with the object to be cooled after throttling to achieve an ideal cooling effect. At the same time, the water replenishment is preheated for the first time, and then mixed with the high-temperature steam after driving the pneumatic pump 20 in a mixing tank 25 to further increase the temperature of the water replenishment. The fully preheated water replenishment then enters the steam generator 14 to ensure the continuous and stable production of high-temperature steam by the unit.

[0073] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0074] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0075] The above are only specific embodiments of the present invention, which enable those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A lubricating oil cooling and water replenishing system for a heat pump centrifuge, characterized in that, The lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: a compressor, a steam generator connected to the outlet of the compressor, and an evaporator connected to the inlet of the compressor; it further includes: A pneumatic pump, the pneumatic pump includes a driving impeller and a passive impeller coaxially connected to the driving impeller. The upstream end of the driving impeller is connected to the steam generator through a high-temperature steam transmission pipeline, so that high-temperature water vapor serves as the driving source of the pneumatic pump; the upstream end of the passive impeller is connected to the liquid refrigerant pipeline of the evaporator, so as to boost the pressure of the liquid refrigerant in the evaporator. A heat exchanger, the heat exchanger is connected between the passive impeller and the steam generator, the heat exchanger is connected between the passive impeller and the evaporator, and the heat exchanger is also used to receive water replenishment and lubricating oil. Inside the heat exchanger, the refrigerant exchanges heat with the lubricating oil to lower the temperature of the lubricating oil.

2. The lubricating oil cooling and water replenishing system of the heat pump centrifuge according to claim 1, characterized in that, The lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: an oil pump with an oil tank and a cooling throttle valve. The cooling throttle valve is connected between the steam generator and the heat exchanger, and the oil pump is connected in a cycle between the upstream end and the downstream end of the compressor.

3. The lubricating oil cooling and water replenishing system of the heat pump centrifuge according to claim 2, wherein, The lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: a secondary plate heat exchanger. The secondary plate heat exchanger is connected between the oil pump and the upstream end of the compressor, and the cooling throttle valve is connected between the secondary plate heat exchanger and the heat exchanger.

4. The lubricating oil cooling and water replenishing system of the heat pump centrifuge according to claim 1, wherein The upstream end of the heat exchanger is connected to a water replenishing pump with a water replenishing tank.

5. The lubricating oil cooling and water replenishing system of the heat pump centrifuge according to claim 1, characterized in that, The lubricating oil cooling and water replenishing system of the heat pump centrifuge includes: a mixing tank. The mixing tank is connected between the heat exchanger and the steam generator, so that the water replenishment is preheated and then mixed with the high-temperature steam after driving the pneumatic pump in the mixing tank, and the fully preheated water replenishment enters the steam generator.

6. The lubricating oil cooling and water replenishing system of the heat pump centrifuge according to claim 5, wherein The mixing tank is connected between the upstream ends of the heat exchanger and the steam generator. At the same time, the mixing tank is connected between the downstream end of the driving impeller and the upstream end of the steam generator.

7. The lubricating oil cooling and water replenishing system of the heat pump centrifuge according to claim 5, characterized in that, The downstream end of the steam generator is sequentially connected to the upstream end of the evaporator through a first throttle valve and a second throttle valve.

8. The lubricating oil cooling and water replenishing system for a heat pump centrifuge according to claim 7, characterized in that, A flash tank is connected between the first throttle valve and the second throttle valve.

9. A compressor, characterized in that, It includes the lubricating oil cooling and water replenishing system of the heat pump centrifuge according to any one of claims 1-8.

10. A water replenishing and preheating method, characterized in that, Applying the lubricating oil cooling and water replenishing system of the heat pump centrifuge according to any one of claims 5-8, the method includes: Obtaining high-temperature and high-pressure water vapor in the steam generator; Applying the high-temperature and high-pressure water vapor to the pneumatic pump to start the pneumatic pump, boost the pressure of the liquid refrigerant in the evaporator, and pump the liquid refrigerant to the heat exchanger. In the heat exchanger, the water replenishment and the liquid refrigerant are preheated once to obtain a mixed liquid; Controlling the mixed liquid to flow to the mixing tank. At the same time, controlling the high-temperature and high-pressure water vapor to flow to the mixing tank through the pneumatic pump. In the mixing tank, the water replenishment after the first preheating is mixed with the high-temperature and high-pressure water vapor for secondary preheating, and then flows back to the steam generator.

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