Heat pump centrifuge lubricating oil cooling and water supply system, compressor and water supply preheating method

Abstract

The present application relates to a heat pump centrifuge lubricating oil cooling and water supply system, a compressor and a water supply preheating method. The heat pump centrifuge lubricating oil cooling and water supply system includes: a compressor, a steam generator connected to the compressor outlet and an evaporator connected to the compressor inlet; it also includes: 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 the 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, and between the passive impeller and the evaporator. The heat exchanger is also used to receive water supply and lubricating oil. In the heat exchanger, the refrigerant and the lubricating oil exchange heat to reduce the temperature of the lubricating oil.

Description

Technical Field

[0001] The present application relates to the field related to high-temperature heat pump centrifuge systems, and in particular to a heat pump centrifuge lubricating oil cooling and water replenishment system, a compressor, and a water replenishment preheating method. Background Art

[0002] In the heat pump centrifuge lubricating oil cooling and water supply system, the high steam temperature at the steam generator outlet (greater than 100°C) poses a challenge to cooling components such as the unit's lubricating oil system. The traditional method of extracting high-temperature, high-pressure liquid refrigerant from the steam generator and cooling it after throttling is difficult to reduce the temperature of components such as the lubricating oil system to the ideal range after throttling, as the steam generator liquid refrigerant temperature is inherently high (greater than 100°C). This can easily lead to over-temperature shutdowns and high oil temperature alarms, directly affecting the reliable operation of the system and even causing the system to fail to operate.

[0003] At the same time, in the heat pump centrifuge lubricating oil cooling and water replenishment system, since the steam generator continuously produces high-temperature, high-pressure water vapor, it is necessary to continuously replenish water to the steam generator. Municipal normal temperature water is conventionally used for replenishment. Since the municipal water temperature is relatively low (25°C), it is directly replenished into the steam generator, causing the temperature in the steam generator to drop sharply, resulting in intermittent steam production of the unit, affecting the use of back-end users. Summary of the Invention

[0004] The present application provides a heat pump centrifuge lubricating oil cooling and water supply system, a compressor, and a water supply preheating method to solve the technical problems of over-temperature shutdown or high oil temperature alarm in the above-mentioned prior art (the problem of difficulty in cooling components such as the heat pump centrifuge lubricating oil cooling and water supply system, improve the unit's operating reliability, and ensure the unit's continuous and stable production of high-temperature steam).

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

[0006] Among them, the heat pump centrifuge lubricating oil cooling and water replenishment system 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 circulated between the upstream end and the downstream end of the compressor.

[0007] Among them, the heat pump centrifuge lubricating oil cooling and water supply system includes: a secondary plate exchanger, the secondary plate 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 exchanger and the heat exchanger.

[0008] Wherein, the upstream end of the heat exchanger is connected to a water supply pump with a water supply tank.

[0009] Among them, the heat pump centrifuge lubricating oil cooling and water supply system includes: a mixing water tank, which is connected between the heat exchanger and the steam generator, so that the make-up water is mixed with the high-temperature steam used to drive the pneumatic pump in the mixing water tank after being preheated, and the fully preheated make-up water enters the steam generator.

[0010] The mixing water tank is connected between the heat exchanger and the upstream end of the steam generator, and 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] Wherein, 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] Wherein, a flasher is connected between the first-level throttle valve and the second-level throttle valve.

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

[0014] The present invention also provides a water replenishment and preheating method, which uses the above-mentioned heat pump centrifuge lubricating oil cooling and water replenishment system, and the method comprises:

[0015] Obtaining high-temperature and high-pressure steam from the steam generator;

[0016] Applying the high-temperature and high-pressure water vapor to the pneumatic pump to start the pneumatic pump and increase the pressure of the liquid refrigerant in the evaporator, and then pumping the liquid refrigerant into the heat exchanger, where the water and the liquid refrigerant are preheated to obtain a mixed liquid;

[0017] The mixed liquid is controlled to flow to the mixing water tank. At the same time, the high-temperature and high-pressure steam is controlled to flow to the mixing water tank via the pneumatic pump. In the mixing water tank, the preheated make-up water is mixed with the high-temperature and high-pressure steam for secondary preheating, and then flows back to the steam generator.

[0018] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0019] The heat pump centrifuge lubricating oil cooling and water supply system, compressor and water supply preheating method provided in the embodiments of the present application can use the high-temperature water vapor in the steam generator to drive the pneumatic pump to increase the pressure of the liquid refrigerant in the evaporator, which can directly solve the problem that the high-temperature steam heat pump centrifuge system cannot use the pressure difference to increase the pressure of the liquid refrigerant in the evaporator. At the same time, the refrigerant and the lubricating oil exchange heat in the heat exchanger, which can reduce the temperature of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0023] Figure 1 This is a schematic structural diagram of the heat pump centrifuge lubricating oil cooling and water replenishment system provided in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 1. Oil tank; 2. Oil pump; 3. Heat exchanger; 4. Evaporator; 5. Compressor; 6. Heat source water inlet; 7. Heat source water outlet; 8. Air supply pipe; 9. Steam outlet control valve; 11. Secondary throttle valve; 12. Flasher; 13. Primary throttle valve; 14. Steam generator; 15. Make-up water pump; 16. Make-up water tank; 17. Municipal water inlet valve; 20. Pneumatic pump; 21. Driving impeller; 22. Passive impeller; 23. Secondary plate exchanger; 24. Cooling throttle valve; 25. Mixing water tank. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely 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. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0028] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures. These relative terms include, for example, "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "rear," and the like. Such spatially relative terms are intended to encompass different orientations of the device during use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, changes position, or changes motion, these directional indications will change accordingly. For example, an element described as "below" or "beneath" another element or feature would subsequently be oriented "above" or "above" the other element or feature. Thus, the example term "below" can encompass both above and below orientations. The device may be oriented differently (rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0029] The currently used high-temperature steam heat pump centrifugal system primarily consists of a compressor, evaporator, steam generator (also known as a steam generator), flash heater, water supply tank, primary throttle valve, secondary throttle valve, oil tank, and oil pump. The compressor compresses the refrigerant vapor in the evaporator, forming a high-temperature, high-pressure gaseous refrigerant that enters the steam generator's evaporator condenser tubes. The high-temperature, high-pressure gaseous refrigerant exchanges heat with make-up water from the make-up water tank through the evaporator condenser tubes. The make-up water vaporizes into high-temperature, high-pressure steam, which is then supplied to downstream users via a steam outlet control valve. The gaseous refrigerant in the evaporator condenses into liquid refrigerant, which is throttled by the primary throttle valve, flash heater, and secondary throttle valve before entering the evaporator. In the evaporator, the liquid refrigerant evaporates into a gaseous state, removing heat from the heat source water in the evaporator tubes. It is then compressed by the compressor and enters the next refrigeration cycle. The oil tank and oil pump provide lubricating oil to the compressor bearings, ensuring adequate lubrication and removing heat from the bearings.

[0030] In a high-temperature steam heat pump centrifugal system, the traditional method for cooling the lubricating oil is to take a high-temperature, high-pressure liquid refrigerant from the steam generator, throttle it through a cooling throttle valve, and then enter the plate heat exchanger. The refrigerant exchanges heat with the lubricating oil from the oil pump, reducing the temperature of the lubricating oil. The refrigerant is then supplied to the compressor bearings. After evaporating in the plate heat exchanger, the gaseous refrigerant returns to the evaporator. In this method, due to the high temperature of the high-temperature, high-pressure refrigerant in the evaporative condenser (greater than 100°C), the refrigerant temperature remains high after throttling through the cooling throttle valve (generally greater than 70°C after throttling), and cannot be significantly reduced. Ultimately, the lubricating oil temperature in the plate heat exchanger cannot be effectively reduced (the required lubricating oil temperature is generally not greater than 60°C), which can easily lead to over-temperature shutdown and high oil temperature alarms, directly affecting the reliable operation of the system.

[0031] 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 heat is exchanged with the normal-temperature make-up water to obtain supercooling. After throttling, the make-up water is exchanged with the cooled object 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.

[0032] The details are as follows:

[0033] In a high-temperature steam heat pump centrifugal system, the traditional water replenishment method involves drawing ambient-temperature municipal water (25°C) from a municipal water inlet valve 17 as replenishment water, storing it in a replenishment tank 16, and pumping it through a replenishment pump 15 into a steam generator 14. During steam generation, the replenishment water vaporizes into high-temperature, high-pressure steam, which is then supplied to downstream users. In this method, because the replenishment water is at ambient temperature, the high heat required to vaporize it into high-temperature steam causes a sharp drop in the temperature of the steam generator 14, resulting in intermittent steam production and impacting downstream users.

[0034] An embodiment of the present application provides a heat pump centrifuge lubricating oil cooling and water supply system, comprising: 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 comprising: a pneumatic pump 20 and a heat exchanger 3, the pneumatic pump 20 comprising a driving impeller 21 and a passive impeller 22 coaxially connected to the driving impeller 21, the upstream end of the driving impeller 21 being connected to the steam generator 14 through a high-temperature steam delivery pipeline, so that the high-temperature water vapor serves as the driving source of the pneumatic pump 20; the upstream end of the passive impeller 22 being connected to the liquid refrigerant pipeline of the evaporator 4, so that the liquid refrigerant in the evaporator 4 is pressurized; the heat exchanger 3 is connected between the passive impeller 22 and the steam generator 14, and between the passive impeller 22 and the evaporator 4, the heat exchanger 3 is also used to receive water supply and lubricating oil, and in the heat exchanger 3, the refrigerant and the lubricating oil exchange heat to reduce the temperature of the lubricating oil.

[0035] In this way, the high-temperature water vapor in the steam generator 14 can be used to drive the pneumatic pump 20 to increase the pressure of the liquid refrigerant in the evaporator 4, which can directly solve the problem that the high-temperature steam heat pump centrifuge system cannot use the pressure difference to increase the pressure of the liquid refrigerant in the evaporator 4. At the same time, the refrigerant and the lubricating oil exchange heat in the heat exchanger 3, which can reduce the temperature of the lubricating oil.

[0036] Specifically, the high-temperature steam generated by the steam generator 14 is used to drive the driving impeller 21 of the pneumatic pump 20, cleverly converting the energy of the steam into mechanical energy, driving the passive impeller 22 coaxially connected to the driving impeller 21 to rotate, thereby increasing the pressure of the liquid refrigerant in the evaporator 4. This process is not only highly efficient, but also completely avoids the technical bottleneck of the traditional high-temperature steam heat pump centrifuge system that cannot effectively increase the pressure of the liquid refrigerant due to insufficient pressure difference. At the same time, through the sufficient 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 excessively high lubricating oil temperature, greatly improving the operating stability and reliability of the entire heat pump centrifuge system, extending the service life of the equipment, reducing maintenance costs, and significantly improving the energy efficiency ratio of the system, achieving the goal of energy-saving and efficient operation.

[0037] For example, the pneumatic pump 20 can be replaced by an electric pump, which is driven by a motor and converts electrical energy into mechanical energy to increase the pressure of the liquid refrigerant.

[0038] Considering the supply scheme of lubricating oil in the system, in the heat pump centrifuge lubricating oil cooling and water replenishment system provided in the embodiment of the present application, the heat pump centrifuge lubricating oil cooling and water replenishment system 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 circulated and connected between the upstream end and the downstream end of the compressor 5.

[0039] In the heat pump centrifuge lubricating oil cooling and water replenishment system, the oil pump 2 uses its own power to build a circulation channel for the lubricating oil between the upstream and downstream ends of the compressor 5. When the system is running, the oil pump 2 continuously extracts the lubricating oil from the oil tank 1, allowing it to flow through various key parts of the compressor 5, lubricating, cooling and sealing the compressor 5. At the same time, the cooling throttle valve 24 is installed between the steam generator 14 and the heat exchanger 3. Its main function is to regulate the flow rate and pressure of the fluid 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 achieves 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, thereby ensuring the stable and efficient heat exchange process between the refrigerant and the lubricating oil in the heat exchanger 3.

[0040] In this way, the upstream and downstream circulation connection between the oil pump 2 and the compressor 5 can provide continuous and stable lubrication for the compressor 5, effectively reduce the friction loss between the various components of the compressor 5, reduce the degree of wear, and significantly improve the service life and operational 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 can, on the one hand, optimize the heat exchange conditions in the heat exchanger 3, ensure sufficient 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 help maintain the balance of pressure inside the system, reduce energy loss caused by pressure fluctuations, improve the operational stability and energy efficiency of the entire heat pump centrifuge system, and at the same time avoid damage to the heat exchanger 3 and other components due to excessive pressure, ensuring the safe and stable operation of the system.

[0041] By combining the aforementioned application of the pneumatic pump 20 and the heat exchanger 3, the following effects can be further achieved:

[0042] The heat pump centrifuge lubricating oil cooling and water replenishment system achieves 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 lubricating oil circulation channel constructed by the oil pump 2 between the upstream and downstream of the compressor 5 continuously provides stable lubrication for the compressor 5, effectively reducing component wear and extending the service life of the equipment; the cooling throttle valve 24 accurately adjusts the fluid parameters flowing from the steam generator 14 to the heat exchanger 3, and cooperates with the pneumatic pump 20 to use high-temperature water vapor to drive the liquid refrigerant to increase pressure and the heat exchanger 3 to achieve efficient heat exchange between the refrigerant and the lubricating oil. This not only ensures that the lubricating oil is fully cooled in the system, but also optimizes the pressure balance and energy transmission of the entire system, reducing energy loss caused by pressure fluctuations and low heat exchange efficiency, significantly improving the operating stability, reliability and energy efficiency of the heat pump centrifuge system, while ensuring that each component works under appropriate working conditions, reducing maintenance costs, and enhancing the overall performance of the system.

[0043] Considering the specific scheme of heat exchange, in the heat pump centrifuge lubricating oil cooling and water replenishment system provided in the embodiment of the present application, the heat pump centrifuge lubricating oil cooling and water replenishment system includes: a secondary plate exchanger 23, the secondary plate exchanger 23 is connected between the oil pump 2 and the upstream end of the compressor 5, and the cooling throttle valve 24 is connected between the secondary plate exchanger 23 and the heat exchanger 3.

[0044] It can be understood that in this heat pump centrifuge lubricating oil cooling and water replenishment system, the secondary plate exchanger 23 is a key heat exchange component. For example, the secondary plate exchanger 23 is composed of a series of corrugated metal sheets stacked together, with multiple independent fluid channels formed between the plates. When the oil pump 2 draws lubricating oil from the oil tank 1 and delivers it to the secondary plate exchanger 23, the lubricating oil flows through one set of channels in the secondary plate exchanger 23. Simultaneously, the fluid that has flowed out of the cooling throttle valve 24 and undergone preliminary conditioning enters another set of channels in the secondary plate exchanger 23. Due to the excellent thermal conductivity of the plates, the fluids in the two sets of channels exchange heat through the plates, achieving a preliminary cooling of the lubricating oil in this process. Subsequently, the lubricating oil that has undergone preliminary cooling in the secondary plate exchanger 23 flows to the upstream end of the compressor 5, while the fluid that has completed heat exchange in the other set of channels continues to flow to the heat exchanger 3 for subsequent deep heat exchange, thereby achieving a graded cooling process for the lubricating oil throughout the entire system.

[0045] In this way, the unique corrugated plate structure of the secondary plate exchanger 23 greatly increases the heat exchange area, while enhancing the turbulence of the fluid, significantly improving the heat exchange efficiency, enabling the lubricating oil to be effectively cooled in a short period of time, reducing the heat exchange burden of the subsequent heat exchanger 3, and ensuring the heat exchange effect of the entire system. In addition, the layout of the secondary plate exchanger 23 connected between the oil pump 2 and the upstream end of the compressor 5 and between the cooling throttle valve 24 and the heat exchanger 3 realizes the graded cooling of the lubricating oil, allowing the lubricating oil to undergo preliminary cooling before entering the compressor 5, reducing the adverse effects of high-temperature lubricating oil on the compressor 5, and improving the operating stability and reliability of the compressor 5; at the same time, it rationally distributes the heat exchange within the system, optimizes the energy utilization efficiency of the system, reduces energy consumption, and facilitates the separate maintenance and cleaning of the secondary plate exchanger 23 according to actual working conditions, effectively avoiding the impact of the decline in heat exchange efficiency on the overall performance of the system.

[0046] Considering the solution of the water supply path going through the heat exchanger 3, in the heat pump centrifuge lubricating oil cooling water supply system provided in the embodiment of the present application, the upstream end of the heat exchanger 3 is connected to the water supply pump 15 with the water supply tank 16.

[0047] In this way, the water supply pump 15 can stably transport the water in the water supply 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, and works together with the lubricating oil and refrigerant to increase the heat exchange capacity of the heat exchange medium, improve the heat exchange efficiency of the heat exchanger 3, and enable the lubricating oil to be more fully cooled. On the other hand, stable water replenishment can maintain the total balance of the heat exchange medium in the system, avoid the degradation of the system's 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 increase pressure and the efficient heat exchange function of the heat exchanger 3 itself, the entire system, with the support of water replenishment, further optimizes energy transfer efficiency, reduces energy consumption, ensures that key components such as the compressor 5 operate in a good lubrication and cooling environment, and extends the service life of the equipment.

[0048] For example, it is possible to consider using gravity water replenishment instead of the water replenishment pump 15. The water replenishment tank 16 can be installed at a position higher than the heat exchanger 3, and the gravity generated by the water level difference can be used to make water flow naturally into the heat exchanger 3. This does not require additional power equipment, reducing equipment costs and operating energy consumption. At the same time, it reduces the risk of abnormal system water replenishment due to failure of the water replenishment pump 15, thereby improving the stability of the system. An intelligent variable frequency water replenishment device can also be introduced to replace the traditional water replenishment pump 15. The intelligent variable frequency water replenishment device can monitor the water replenishment needs of the system in real time according to parameters such as temperature and pressure in the heat exchanger 3, and automatically adjust the water replenishment flow rate through frequency conversion technology to achieve precise water replenishment. Compared with the fixed flow water replenishment pump 15, it can avoid excessive water replenishment causing water resource waste and system pressure fluctuations, and can also prevent insufficient water replenishment from affecting the heat exchange effect, further improving the intelligence and energy saving level of the system.

[0049] Considering the solution of adding preheating, the heat pump centrifuge lubricating oil cooling and water supply system provided in the embodiment of the present application includes: a mixing water tank 25, which is connected between the heat exchanger 3 and the steam generator 14, so that the make-up water is mixed with the high-temperature steam used to drive the pneumatic pump 20 in the mixing water tank 25 after being preheated, and the fully preheated make-up water enters the steam generator 14.

[0050] In this way, by providing a mixing water tank 25 between the heat exchanger 3 and the steam generator 14, efficient preheating of the feed water is achieved. The feed water first absorbs some heat in the heat exchanger 3 to complete preliminary preheating, and then enters the mixing water tank 25 to mix with the high-temperature steam after driving the pneumatic pump 20. The waste heat of the high-temperature steam is fully utilized, allowing the feed water to be further heated. The fully preheated feed water enters the steam generator 14, which can significantly reduce the energy consumption of the steam generator 14 to heat the water to the required temperature, thereby improving energy utilization efficiency. At the same time, this preheating method makes the feed water temperature entering the steam generator 14 more stable, which helps the steam generator 14 operate stably and reduces the problem of unstable steam production and quality caused by feed water temperature fluctuations. In addition, combined with the pneumatic pump 20 using high-temperature steam to drive the liquid refrigerant to increase pressure and the heat exchanger 3 cooling the lubricating oil, the energy circulation of the entire system is smoother, the collaborative working efficiency of each component is improved, further ensuring the stability and reliability of the heat pump centrifuge system operation and extending the service life of the equipment.

[0051] For example, a tubular preheater can be used instead of the mixing water tank 25 to preheat the feed water. The tubular preheater consists of multiple heat exchange tubes. The feed water flows inside the tubes, and the high-temperature steam after driving the pneumatic pump 20 flows outside the tubes, exchanging heat through the tube walls. This method can achieve a larger heat exchange area and improve preheating efficiency. The tubular structure is easy to install and maintain, and the number and length of the heat exchange tubes can be adjusted according to actual needs.

[0052] For example, a waste heat recovery heat pump system can be used to preheat the feed water. This system can more accurately recover the waste heat from the high-temperature steam that drives the pneumatic pump 20 and transfer the heat to the feed water through a heat pump cycle. Compared to a direct mixing method, this system can more flexibly control the feed water preheating temperature to meet the needs of different operating conditions. Furthermore, the waste heat recovery heat pump system has relatively high energy efficiency, which can further reduce the system's energy consumption and improve overall energy conservation.

[0053] Considering the position installation scheme of the mixing water tank 25, in the heat pump centrifuge lubricating oil cooling and water supply system provided in the embodiment of the present application, the mixing water tank 25 is connected between the heat exchanger 3 and the upstream end of 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.

[0054] 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 waste heat of the steam is used to preheat the make-up water, significantly reducing the energy consumption required by the steam generator 14 to subsequently heat the water to the operating temperature, thereby improving energy utilization. In addition, this layout makes the heat transfer path of the entire system more reasonable. The waste heat generated by the pneumatic pump 20 and the heat exchanger 3 is effectively utilized through the mixing water tank 25, realizing energy recycling and further optimizing the energy efficiency of the heat pump centrifuge system. In addition, the stable preheated make-up water entering the steam generator 14 helps maintain the stability of the steam generator 14's operating conditions, reduces the problem of unstable steam production and quality caused by fluctuations in the make-up water temperature, ensures the continuous and efficient operation of the system, and extends the service life of the equipment.

[0055] For example, the mixing water tank 25 can be replaced with a spiral-wound preheater installed in the same location. The spiral structure of the spiral-wound preheater increases the contact area and residence time of the fluids, allowing for more complete heat exchange between the high-temperature steam after driving the pneumatic pump 20 and the makeup water from the heat exchanger 3 within a smaller space, improving preheating efficiency. Its compact structure also facilitates installation and spatial layout.

[0056] For example, a segmented preheating pipeline can be used in place of 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. Multiple heat exchange fins or a heat-conducting medium are installed on the pipeline. This allows the make-up water to gradually absorb the waste heat from the high-temperature steam that drives the pneumatic pump 20 during its flow, achieving a preheating effect. This approach eliminates the need for additional large containers, reducing equipment costs and space requirements. Furthermore, by adjusting the pipeline length and number of fins, it can flexibly adapt to the preheating requirements of different operating conditions.

[0057] Considering the application scheme of the throttle valve in the system, in the heat pump centrifuge lubricating oil cooling and water supply system provided in the embodiment of the present application, the downstream end of the steam generator 14 is connected to the upstream end of the evaporator 4 through the first-level throttle valve 13 and the second-level throttle valve 11 in sequence.

[0058] In this way, the downstream end of the steam generator 14 is connected in sequence to the first-stage throttle valve 13 and the second-stage throttle valve 11, which work in conjunction with the pneumatic pump 20 and the heat exchanger 3. The series arrangement of the first-stage throttle valve 13 and the second-stage throttle valve 11 achieves two-stage precise pressure reduction and throttling of the fluid flowing out of the steam generator 14, allowing the fluid to enter the evaporator 4 at an appropriate pressure and flow rate, ensuring the stable and efficient operation of the evaporator 4, while reducing the workload of the single throttle valve and extending the service life of the throttle valve. Combined with the pneumatic pump 20 using high-temperature steam to drive the liquid refrigerant to increase pressure and the heat exchanger 3 to achieve lubricating oil cooling, the application of the two-stage throttle valve optimizes the pressure distribution and energy transfer within the system, effectively avoiding system vibration, noise and component damage caused by sudden pressure changes, ensuring the stability and reliability of the system operation, and further improving the overall energy efficiency and work efficiency of the heat pump centrifuge lubricating oil cooling and water replenishment system.

[0059] For example, a variable frequency speed-regulating pump can be used to replace the primary throttle valve 13 and the secondary throttle valve 11. A variable frequency speed-regulating pump can flexibly control the flow and pressure of the fluid by adjusting the motor speed according to the actual needs of the system. Compared with a throttle valve, it has higher adjustment accuracy and can avoid energy loss during the throttling process, thereby improving the energy saving effect of the system. At the same time, it reduces the potential problems of throttle valve failure such as blockage and wear, thereby reducing system maintenance costs.

[0060] For example, an adjustable Venturi tube can be used instead of a throttle valve. This tube adjusts the flow rate and pressure of the fluid by varying the cross-sectional area of ​​the throat. It features a simple structure and easy adjustment. During adjustment, it effectively reduces pressure loss and improves the system's energy efficiency. Furthermore, the Venturi tube is less susceptible to impurities in the fluid and is more wear-resistant than a throttle valve. It can adapt to complex operating conditions, improving the system's adaptability and stability.

[0061] Considering the gas-liquid separation and pressure regulation scheme, in the heat pump centrifuge lubricating oil cooling and water replenishment system provided in the embodiment of the present application, a flasher 12 is connected between the first-level throttle valve 13 and the second-level throttle valve 11.

[0062] In this way, the flasher 12 can separate the liquid refrigerant after the pressure is reduced by the first-stage throttle valve 13 into gas and liquid, preventing the gaseous refrigerant from mixing with the liquid refrigerant and affecting the throttling effect of the second-stage throttle valve 11. This ensures that the second-stage throttle valve 11 can accurately reduce the pressure of the more stable liquid refrigerant, so that the pressure and flow of the refrigerant entering the evaporator 4 better meet the design requirements, thereby 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, cooperating with the high-temperature steam discharged by the pneumatic pump 20 to preheat and replenish water in the mixing water tank 25, or assisting the heat exchanger 3 in heating the lubricating oil, fully recycling and utilizing energy, and further improving the energy efficiency of the system. In addition, the flasher 12 alleviates pressure fluctuations during the throttling process, and cooperates with the stable pressure increase of the pneumatic pump 20 and the efficient heat exchange of the heat exchanger 3 to ensure the stability of the refrigerant circulation in the system, reduce component wear caused by sudden pressure changes, and extend the service life of the equipment.

[0063] For example, the gas-liquid separation can be achieved by gravity settling and an internal baffle structure in the gas-liquid separation tank, and the liquid refrigerant is transported to the expansion valve for throttling, while the gaseous refrigerant is recycled separately.

[0064] For example, a cyclone gas-liquid separator can also be used. The cyclone gas-liquid separator uses centrifugal force to quickly separate gas and liquid, has high separation efficiency and occupies a small space, and is particularly suitable for scenarios with high requirements for system compactness.

[0065] Furthermore, the heat pump centrifuge lubricating oil cooling and water replenishment system provided in the embodiments of the present application also includes a heat source water inlet 6 and a heat source water outlet 7. Heat source water inlet 6 typically comes from a low-temperature heat source (such as industrial wastewater, waste heat flue gas, geothermal energy, etc.), and its function is to bring low-temperature external heat energy into the heat pump system. For example, in an industrial scenario, heat source water inlet 6 may be high-temperature wastewater generated during the production process (but still "low" relative to the temperature required by the heat pump). The heat carried in the water will be extracted and upgraded by the heat pump.

[0066] For example, in the evaporator 4 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, evaporates from liquid to gas, and realizes the extraction of low-temperature thermal energy; the heat source inlet water 6 is cooled down due to the heat being taken away, and becomes "heat source outlet water 7", which is then discharged from the system or recycled.

[0067] For example, the heat source outlet water 7 is the product after the heat source inlet water 6 releases heat. Its temperature is lower than the inlet water, and the waste heat it carries has been extracted by the heat pump system. The discharged heat source outlet water 7 can be further processed according to demand (such as direct discharge, reuse in the production process or secondary heat exchange) to avoid waste of waste heat.

[0068] In summary, taking the waste heat recovery scenario of liquid supply as an example, the heat source inlet water 6 carries the low-temperature thermal 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, high-pressure gas and enters the condenser; in the condenser, the high-temperature refrigerant releases heat to the medium that needs to be heated (such as heating water, production process hot water), and liquefies itself; after releasing heat, the heat source outlet water 7 is discharged from the system, and the heated medium is used for actual needs.

[0069] Furthermore, the lubricating oil cooling and water supply system for the heat pump centrifuge provided in the embodiment of the present application also includes an air supply pipe 8, which can introduce additional refrigerant gas into the intermediate stage of the compressor 5 when the system is running at low load, effectively increasing the gas flow in the impeller, thereby avoiding surge problems caused by insufficient flow, and ensuring 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 "air supply and enthalpy increase" mechanism and inject it into the intermediate stage of the compressor 5, and continue to compress it after mixing with the main circuit refrigerant, significantly increasing the total heat released by the refrigerant in the condenser and improving the heating capacity of the system; according to the fluctuation of the heat source temperature or heat load, the air supply amount is dynamically adjusted through the valve to accurately match the system load requirements, such as increasing the air supply amount to maintain the condensing temperature when the heat source temperature drops, and reducing the air supply amount to avoid overloading the compressor 5 when the heat load increases. In addition, the air supply pipe 8 can 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 surge, thereby extending the life of the unit and ultimately achieving an improvement in the system energy efficiency ratio.

[0070] Furthermore, the heat pump centrifuge lubricating oil cooling and water replenishment system provided in the embodiment of the present application also includes a steam outlet control valve 9, which 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, thereby avoiding excessive condensation pressure and overloading of the compressor 5. When the heat load increases, the opening is increased to ensure that the refrigerant circulation amount matches the heating demand; the valve can also effectively maintain the condensation temperature in the condenser by controlling the steam outflow pressure, especially when the heat source temperature fluctuates, and the condensation pressure can be stabilized within the design range by adjusting the valve opening to prevent heat exchange efficiency from decreasing or equipment damage due to abnormal pressure; in addition, the steam outlet control valve 9 also has a safety protection function. When the system is overpressured due to a fault, the valve can quickly open to relieve the pressure to avoid safety accidents caused by excessive pressure in the compressor 5 or condenser.

[0071] The embodiment of the present application further provides a compressor 5, which includes the above-mentioned heat pump centrifuge lubricating oil cooling and water replenishing system, and can achieve all the effects of the heat pump centrifuge lubricating oil cooling and water replenishing system.

[0072] The present application also provides a water replenishment and preheating method, which uses the above-mentioned heat pump centrifuge lubricating oil cooling and water replenishment system, and the method includes:

[0073] Obtaining high-temperature and high-pressure steam from the steam generator 14;

[0074] Applying high-temperature and high-pressure water vapor to the pneumatic pump 20 to start the pneumatic pump 20 and increase the pressure of the liquid refrigerant in the evaporator 4. The liquid refrigerant is then pumped into the heat exchanger 3. In the heat exchanger 3, the replenishing water and the liquid refrigerant are preheated to obtain a mixed liquid.

[0075] The mixed liquid is controlled to flow to the mixing water tank 25. At the same time, the high-temperature and high-pressure steam is controlled to flow to the mixing water tank 25 via the pneumatic pump 20. In the mixing water tank 25, the preheated make-up water is mixed with the high-temperature and high-pressure steam for secondary preheating, and then flows back to the steam generator 14.

[0076] 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 power for increasing the pressure of the liquid refrigerant, which not only solves the problem of difficulty in increasing the pressure of the liquid refrigerant in the traditional system, but also realizes efficient use of energy; secondly, in the heat exchanger 3, the liquid refrigerant and the make-up water are preheated once, which effectively utilizes the cooling capacity of the refrigerant and preliminarily increases the make-up water temperature; furthermore, in the mixing water tank 25, the make-up water after the first preheating is preheated for the second time with the high-temperature and high-pressure water vapor passing through the pneumatic pump 20, which further increases the make-up water temperature and realizes the secondary recovery of the waste heat of the steam, greatly reducing the energy consumption required for the steam generator 14 to reheat the make-up water; in addition, the graded preheating method makes the make-up water temperature more uniform and stable, which helps to maintain the stable operation of the steam generator 14, reduce the loss of equipment caused by temperature fluctuations, and extend the service life of the system.

[0077] In summary, this water replenishment and preheating method achieves the dual goals of high efficiency and energy saving and stable operation by rationally distributing and recycling energy within 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.

[0078] Based on the above heat pump centrifuge lubricating oil cooling and water supply system, compressor 5 and water supply preheating method, a summary statement of the scheme is made as follows:

[0079] In the high-temperature steam heat pump centrifugal system, an air 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 vapor is taken from the steam generator 14 and supplied to the air pump 20, which drives the driving impeller 21 to rotate, thereby driving the passive impeller 22 to do work, and after the liquid refrigerant (generally <80°C) in the evaporator 4 is pressurized, it is pumped into the plate heat exchanger 3. The high-temperature and high-pressure water vapor drives the driving impeller 21 and then enters the mixing water tank 25; in the plate heat exchanger 3, the normal temperature make-up water exchanges heat with the liquid refrigerant from the evaporator 4. Due to the large heat exchange temperature difference, it is easy to make the liquid refrigerant supercooled (supercooling degree >30°C). The supercooled liquid refrigerant is throttled by the cooling throttle valve 24 and enters the secondary plate heat exchanger 23. The supercooled and throttled liquid refrigerant exchanges heat with the lubricating oil and evaporates, which can effectively cool the lubricating oil to the target range, and the cooling effect is significant. The evaporated gaseous refrigerant returns to the evaporator 4; at the same time, the room temperature make-up water is preheated for the first time after heat exchange with the liquid refrigerant from the evaporator 4 in the plate heat exchanger 3, and after the temperature is increased (generally it can be increased to 50°C), it enters the 25-mixing water tank 25; in the mixing water tank 25, the make-up water with increased temperature is mixed with the high-temperature and high-pressure water vapor, and the temperature is further increased (the temperature is increased to >80°C), fully preheated, and then enters the steam generator 14. In the steam generator 14, the make-up water after sufficient preheating has a higher temperature itself, and the heat required to vaporize into high-temperature and high-pressure water vapor is relatively reduced, so the temperature in the steam generator 14 will not be sharply reduced, thereby ensuring that the unit continuously and stably produces high-temperature water vapor, thereby improving the stability of the unit.

[0080] Furthermore, the normal temperature make-up water in the make-up water tank 16 is directly used to exchange heat with the refrigerant, so that the refrigerant obtains a large degree of supercooling, and then throttling is performed to exchange heat with the cooled object, thereby achieving a significant cooling effect.

[0081] Furthermore, the normal temperature make-up water from the make-up water tank 16, after being fully preheated twice, effectively solves the stability problem of the high temperature steam output of the unit.

[0082] Furthermore, the water supply pump 15 may also be a pneumatic pump 20, which is also driven by the high-pressure and high-temperature steam in the steam generator 14. After being driven, the high-temperature steam also enters the mixing water tank 25 to preheat the water supply.

[0083] Furthermore, the high-temperature liquid refrigerant driven by the pneumatic pump 20 comes from the evaporator 4, or can come from the flash evaporator 12; the refrigerant obtained by supercooling and throttling in the plate heat exchanger 3 exchanges heat with the cooled object in the secondary plate exchanger 23, or can be directly throttled and then sprayed into the gap between the motor rotor and stator to directly cool the motor and other components.

[0084] The embodiment of the present application proposes a cooling and water replenishment method for a high-temperature steam heat pump centrifuge system, in which the pneumatic pump 20 is driven by high-temperature water vapor to increase the pressure of the liquid refrigerant in the evaporator 4, and heat is exchanged with the normal-temperature replenishment water to obtain supercooling, and then heat is exchanged with the cooled object after throttling to achieve an ideal cooling effect; at the same time, the replenishment 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 replenishment water temperature. The fully preheated replenishment water then enters the steam generator 14 to ensure that the unit continuously and stably produces high-temperature steam.

[0085] 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 indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, 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 specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0086] Although the terms first, second, third, etc. can be used in the text 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 can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0087] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heat pump centrifuge lubricating oil cooling and water supply system, characterized in that: The heat pump centrifuge lubricating oil cooling and water replenishing system includes: a compressor, a steam generator connected to the compressor outlet, and an evaporator connected to the compressor inlet; and further includes: A pneumatic pump comprising a driving impeller and a passive impeller coaxially connected to the driving impeller, wherein the upstream end of the driving impeller is connected to the steam generator via a high-temperature steam delivery pipeline so that high-temperature water vapor serves as a driving source for the pneumatic pump; and the upstream end of the passive impeller is connected to the liquid refrigerant pipeline of the evaporator so as to increase the pressure of the liquid refrigerant in the evaporator; A heat exchanger is connected between the passive impeller and the steam generator, and between the passive impeller and the evaporator. The heat exchanger is also used to receive makeup water and lubricating oil. In the heat exchanger, the refrigerant exchanges heat with the lubricating oil to reduce the temperature of the lubricating oil.

2. The heat pump centrifuge lubricating oil cooling and water replenishing system according to claim 1, characterized in that: The heat pump centrifuge lubricating oil cooling and water replenishment system 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 cyclically connected between the upstream end and the downstream end of the compressor.

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

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

5. The heat pump centrifuge lubricating oil cooling and water replenishing system according to claim 1, characterized in that: The heat pump centrifuge lubricating oil cooling and water supply system includes: a mixing water tank, which is connected between the heat exchanger and the steam generator, so that the preheated make-up water is mixed with the high-temperature steam used to drive the pneumatic pump in the mixing water tank, and the fully preheated make-up water is then fed into the steam generator.

6. The heat pump centrifuge lubricating oil cooling and water replenishing system according to claim 5, characterized in that: The mixing water tank is connected between the heat exchanger and the upstream end of the steam generator. Meanwhile, the mixing water tank is connected between the downstream end of the driving impeller and the upstream end of the steam generator.

7. The heat pump centrifuge lubricating oil cooling and water replenishing system according to claim 5, characterized in that: 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.

8. The heat pump centrifuge lubricating oil cooling and water replenishing system according to claim 7, characterized in that: A flasher is connected between the primary throttle valve and the secondary throttle valve.

9. A compressor, characterized in that: The invention comprises the heat pump centrifuge lubricating oil cooling and water replenishing system according to any one of claims 1 to 8.

10. A water replenishment preheating method, characterized in that: The heat pump centrifuge lubricating oil cooling and water replenishing system according to any one of claims 5 to 8 is used, and the method comprises: Obtaining high-temperature and high-pressure steam from the steam generator; Applying the high-temperature and high-pressure water vapor to the pneumatic pump to start the pneumatic pump and increase the pressure of the liquid refrigerant in the evaporator, and then pumping the liquid refrigerant into the heat exchanger, where the water and the liquid refrigerant are preheated to obtain a mixed liquid; The mixed liquid is controlled to flow to the mixing water tank. At the same time, the high-temperature and high-pressure steam is controlled to flow to the mixing water tank via the pneumatic pump. In the mixing water tank, the preheated make-up water is mixed with the high-temperature and high-pressure steam for secondary preheating, and then flows back to the steam generator.

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