Screw compressor system and heat pump system

Abstract

The utility model relates to a screw compressor system and a heat pump system, and the screw compressor system comprises a screw compressor which comprises a rotor cavity and a bearing cavity; the oil separation device is communicated with an exhaust port of the screw compressor, the oil separation device is configured to separate lubricating oil from the gaseous refrigerant, and the oil separation device comprises an oil outlet through which the lubricating oil flows out; the oil cooling device comprises a lubricating oil circulation pipeline and a cooling assembly, the cooling assembly is configured to cool lubricating oil flowing through the lubricating oil circulation pipeline, a first opening and a third opening are formed in the two ends of the lubricating oil circulation pipeline respectively, a second opening is formed between the first opening and the third opening, the first opening is communicated with the oil outlet, and the second opening is communicated with the oil outlet. The second opening supplies lubricating oil at the first temperature to the rotor cavity through the first oil supply branch, the third opening supplies lubricating oil at the second temperature to the bearing cavity through the second oil supply branch, and the first temperature is higher than the second temperature.

Description

Technical Field

[0001] The present disclosure relates to the technical field of screw compressors, and in particular, to a screw compressor system and a heat pump system. Background Art

[0002] During the operation of a heat pump unit, the bearings of a screw compressor need to be supplied with lubricating oil having sufficient viscosity and within a certain temperature range, so that the lubricating oil can form a uniform and sufficient liquid oil film layer on the lubricating surface of the compressor bearings, reduce the frictional resistance, and stabilize the working temperature of the bearings. The lubricating oil needs to be cooled and pre-treated first to meet the required indicators.

[0003] In the related art known to the inventors, in addition to being supplied into the bearing cavity for lubrication, the cooled lubricating oil also needs to be supplied into the rotor cavity of the screw compressor. Therefore, the lubricating oil cooled and pre-treated to lower the temperature will simultaneously over-cool the refrigerant in the compression process in the rotor cavity, resulting in a decrease in the exhaust temperature at the compressor outlet. The decrease in the exhaust temperature will cause the exhaust superheat to drop to a dangerous range, the separation ability of the lubricating oil from the gaseous refrigerant to decrease, and at the same time, the decrease in the exhaust temperature will also cause the heating capacity and energy efficiency of the heat pump unit to decrease. Summary of the Utility Model

[0004] Embodiments of the present disclosure provide a screw compressor system and a heat pump system that can balance the lubricating oil cooling requirements of the compressor bearing cavity and the compressor exhaust temperature.

[0005] According to a first aspect of the present disclosure, a screw compressor system is proposed, including:

[0006] A screw compressor, including a rotor cavity and a bearing cavity;

[0007] An oil separation device, connected to the exhaust port of the screw compressor, the oil separation device being configured to separate lubricating oil from gaseous refrigerant, the oil separation device including an oil outlet for the lubricating oil to flow out; and

[0008] An oil cooling device, including a lubricating oil circulation pipeline and a cooling component, the cooling component being configured to cool the lubricating oil flowing through the lubricating oil circulation pipeline. The two ends of the lubricating oil circulation pipeline are respectively provided with a first opening and a third opening, and a second opening is provided between the first opening and the third opening. The first opening is connected to the oil outlet, the second opening supplies lubricating oil at a first temperature to the rotor cavity through a first oil supply branch, and the third opening supplies lubricating oil at a second temperature to the bearing cavity through a second oil supply branch, the first temperature being higher than the second temperature.

[0009] In some embodiments, the lubricating oil circulation pipeline includes a first pipe section and a second pipe section. The first pipe section is connected between the first opening and the second opening, and the second pipe section is connected between the second opening and the third opening.

[0010] In some embodiments, the cooling assembly includes a first cooling component and a second cooling component. The first cooling component is configured to cool the lubricating oil flowing through the first pipe section, and the second cooling component is configured to cool the lubricating oil flowing through the second pipe section. The first cooling component and the second cooling component operate independently.

[0011] In some embodiments, the first cooling component is configured to reduce the cooling power when the actual exhaust superheat of the screw compressor is less than the preset superheat, and maintain the cooling power unchanged or increase the cooling power when the actual exhaust superheat is not less than the preset superheat.

[0012] In some embodiments, the screw compressor system further includes:

[0013] A first temperature sensor and a first pressure sensor, both provided at the exhaust port of the screw compressor. The first temperature sensor is configured to detect the exhaust temperature, and the first pressure sensor is configured to detect the exhaust pressure, so as to calculate the actual exhaust superheat according to the exhaust temperature and the exhaust pressure.

[0014] In some embodiments, the screw compressor system further includes:

[0015] A second temperature sensor, configured to detect the second temperature of the lubricating oil at the third opening;

[0016] Wherein, the second cooling component is configured to increase the cooling power when the second temperature is greater than the target lubricating oil temperature, and maintain the cooling power unchanged or reduce the cooling power when the second temperature is not greater than the target lubricating oil temperature.

[0017] In some embodiments, the screw compressor system further includes:

[0018] A second pressure sensor, configured to detect the lubricating oil pressure at the third opening, so as to obtain the target temperature according to the lubricating oil pressure and the preset minimum lubricating oil viscosity.

[0019] In some embodiments, the cooling assembly is further configured to reduce the cooling power when the actual exhaust superheat of the screw compressor is less than the preset superheat, and maintain the cooling power unchanged or increase the cooling power when the actual exhaust superheat is not less than the preset superheat.

[0020] In some embodiments, the screw compressor system further includes a third oil supply branch. The screw compressor further includes a loading and unloading chamber. The first end of the third oil supply branch is communicated with the loading and unloading chamber, and the second end of the third oil supply branch is communicated between the oil outlet and the first opening.

[0021] In some embodiments,

[0022] The loading and unloading chamber is selectively communicated with the second opening; and / or

[0023] The loading and unloading chamber is selectively communicated with the third opening.

[0024] In some embodiments, the cooling assembly adopts at least one of air cooling, liquid cooling, or refrigerant cooling.

[0025] In some embodiments, the screw compressor system further includes:

[0026] A third temperature sensor configured to detect the third temperature of the bearing in the bearing chamber; and

[0027] A throttle valve provided on the second oil supply branch. The throttle valve is configured to increase the opening or keep the opening unchanged when the third temperature is greater than the target bearing temperature, and decrease the opening when the third temperature is not greater than the target bearing temperature.

[0028] According to a second aspect of the present disclosure, a heat pump system is provided, including:

[0029] The screw compressor system of the above embodiment;

[0030] An evaporator communicated with the air inlet of the screw compressor; and

[0031] A condenser communicated with the gaseous refrigerant outlet of the oil separation device.

[0032] In some embodiments, the refrigerant includes an environmentally friendly refrigerant.

[0033] Based on the above technical solutions, the screw compressor system of the embodiments of the present disclosure supplies lubricating oil at different temperatures to different parts of the compressor, which can avoid mutual interference in the lubricating oil supply states of different parts; by supplying lubricating oil at the first temperature to the rotor chamber and lubricating oil at the second temperature lower than the first temperature to the bearing chamber, it can not only meet the demand for low-temperature lubricating oil in the bearing chamber, optimize the bearing lubrication effect, and extend the bearing service life; but also prevent lubricating oil with too low temperature from entering the rotor chamber and excessively reducing the refrigerant temperature, thereby avoiding the compressor exhaust temperature from dropping to a dangerous range, and further improving the separation ability of the lubricating oil from the gaseous refrigerant, increasing the purity and lubricating ability of the lubricating oil, and achieving both the lubricating oil cooling demand of the compressor bearing chamber and the compressor exhaust temperature. Description of the Drawings

[0034] The drawings described herein are used to provide a further understanding of the present disclosure, and constitute a part of this application. The schematic embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation to the present disclosure. In the drawings:

[0035] Figure 1 It is a schematic diagram of the composition of some embodiments of the screw compressor system of the present disclosure.

[0036] Figure 2 Structural schematic diagrams of some embodiments of the oil cooling device of the present disclosure.

[0037] Figure 3 Composition schematic diagrams of some embodiments of the heat pump system of the present disclosure.

[0038] Explanation of reference numerals

[0039] 1. Screw compressor; 101. Air inlet; 102. Exhaust port; 11. Rotor cavity; 12. Bearing cavity; 121. Front bearing cavity; 122. Rear bearing cavity; 13. Loading and unloading cavity; 14. Motor; 100. First oil supply branch; 200. Second oil supply branch; 300. Third oil supply branch; 2. Oil separation device; 21. Oil outlet; 22. Gaseous refrigerant inlet; 23. Gaseous refrigerant outlet; 3. Oil cooling device; 30. Throttle valve; 31. Lubricating oil circulation pipeline; 311. First opening; 312. Second opening; 313. Third opening; 32. Cooling assembly; 321. First cooling component; 322. Second cooling component; 41. First temperature sensor; 42. Second temperature sensor; 43. Third temperature sensor; 44. Fourth temperature sensor; 51. First pressure sensor; 52. Second pressure sensor; 6. Evaporator; 7. Condenser. Detailed implementation manners

[0040] Now, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions, and numerical values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0041] The terms "first", "second", and the like used in the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different parts. The terms such as "comprising" or "including" mean that the elements before the term cover the elements listed after the term and do not exclude the possibility of also covering other elements. The terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0042] In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0043] All terms used in the present disclosure (including technical terms or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as those, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0044] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0045] Based on the above-described embodiments of the present disclosure, without explicit negation or conflict, the technical features of one embodiment can be beneficially combined with one or more other embodiments.

[0046] The inventors found during the research process that in the related art, the bearing cavity and the rotor cavity are supplied with oil in a unified manner, and there is only one oil supply port for the compressor to the outside. The oil supply amount to different parts is adjusted by the throttle orifice plug inside the compressor, and the temperature and pressure states of the lubricating oil supplied to different parts are the same. The lubricating oil collected from the compressor exhaust through the oil separator will first be purified and cooled pre-treated to meet the required indicators. In addition to being supplied to the bearing cavity for lubrication, the cooled lubricating oil also needs to be supplied to the rotor cavity of the screw compressor. However, the lubricating oil required by the bearing cavity of the screw compressor has a lower temperature than that required by the rotor cavity. Therefore, the lubricating oil that meets the requirements of the bearing cavity after being cooled and pre-treated will over-cool the refrigerant in the rotor cavity during the compression process when it enters the rotor cavity, resulting in a decrease in the exhaust temperature at the compressor outlet.

[0047] The decrease in the exhaust temperature will directly weaken the overall heating capacity and reduce the energy efficiency in the application of heat pump units, especially high-temperature heat pump units. At the same time, in the work of replacing environmental protection refrigerants for high-temperature heat pumps in recent years, the operating exhaust superheat of new large-molecular-weight environmental protection refrigerants is in a lower range. In this state, it is more difficult to separate, collect, and purify the lubricating oil from the oil separator. If the exhaust temperature is excessively reduced, the exhaust superheat will drop to a dangerous range, and the purity and working viscosity of the lubricating oil mixture highly diluted by the refrigerant will change, and the lubricating ability will decrease.

[0048] Therefore, there is a contradiction between meeting the bearing requirements of low temperature and high viscosity for lubricating oil cooling and maintaining a sufficient exhaust temperature. If the lubricating oil cooling requirement of the bearing is prioritized, the heating capacity and the lubricating oil separation ability will be sacrificed; if the heating capacity and the lubricating oil separation ability are prioritized, the lubricating oil cooling requirement of the bearing cannot be met, and the viscosity of the lubricating oil decreases at high lubricating oil temperatures, resulting in a reduction in the working life of the bearing. If only lubricating oil with a higher viscosity is replaced, the lubrication effect is not good, and the working life of the bearing will still decrease.

[0049] To solve the above problems, the present disclosure proposes a screw compressor system, as Figure 1 and Figure 2 shown, including:

[0050] A screw compressor 1, including a rotor chamber 11 and a bearing chamber 12;

[0051] An oil separation device 2, connected to the exhaust port 102 of the screw compressor 1. The oil separation device 2 is configured to separate lubricating oil from the gaseous refrigerant. The oil separation device 2 includes an oil outlet 21 for the lubricating oil to flow out; and

[0052] An oil cooling device 3, including a lubricating oil flow pipeline 31 and a cooling assembly 32. The cooling assembly 32 is configured to cool the lubricating oil flowing through the lubricating oil flow pipeline 31. Both ends of the lubricating oil flow pipeline 31 are respectively provided with a first opening 311 and a third opening 313, and a second opening 312 is provided between the first opening 311 and the third opening 313. The first opening 311 is connected to the oil outlet 21, and the second opening 312 supplies lubricating oil at a first temperature to the rotor chamber 11 through a first oil supply branch 100. The third opening 313 supplies lubricating oil at a second temperature to the bearing chamber 12 through a second oil supply branch 200, and the first temperature is higher than the second temperature.

[0053] Specifically, the rotor chamber 11 of the screw compressor 1 includes a female rotor and a male rotor, and the compression of the refrigerant is achieved by the meshing of the two rotors. The screw compressor 1 includes a motor 14 for driving the movement of the male and female rotors. The lubricating oil provided to the rotor chamber 11 plays a role in lubrication, sealing, and cooling, that is, lubricating the contact surface of the male and female rotors, sealing the gap between the male and female rotors, cooling the refrigerant during the compression process in the rotor chamber, and appropriately reducing the exhaust temperature at the outlet of the compressor. After the lubricating oil enters the rotor chamber, it flows together with the refrigerant to reach the exhaust port 102. The power source for the lubricating oil to circulate in the entire screw compressor system is the compressor pressure difference, and there is no need to additionally set up an oil pump.

[0054] Specifically, the bearing cavity 12 includes a front bearing cavity 121 and a rear bearing cavity 122, and the front bearing cavity 121 communicates with the rear bearing cavity 122. The lubricating oil supplied to the bearing cavity 12 serves to cool the bearing temperature and lubricate the bearing contact surface. The bearing has a minimum viscosity requirement for the lubricating oil. If the viscosity is too low, it will be difficult for the lubricating oil to adhere to the bearing contact surface, resulting in dry grinding and a reduced working life of the bearing. The temperature of the lubricating oil required for the bearing cavity 12 of the screw compressor 1 is lower than that required for the rotor cavity 11. After the lubricating oil enters the front bearing cavity 121 and the rear bearing cavity 122 simultaneously, it flows through the compressor intake port 101, participates in work in the rotor cavity, and then reaches the compressor exhaust port 102. Since the amount of lubricating oil entering the bearing cavity 12 is small, this part of the lubricating oil has little effect on the exhaust temperature.

[0055] Specifically, the oil separation device 2 includes a gaseous refrigerant inlet 22, a gaseous refrigerant outlet 23, and an oil outlet 21. The oil separation device 2 separates liquid lubricating oil, or lubricating oil mixture, from the gaseous refrigerant mixture. The liquid lubricating oil includes a pure lubricating oil part and a small amount of liquid refrigerant. For the sake of simplicity in description, the liquid lubricating oil or lubricating oil mixture is referred to as lubricating oil in the following embodiments. When the superheat degree of the compressor exhaust is high, the lubricating oil separated by the oil separation device 2 has high purity and good lubricating ability; when the superheat degree of the compressor exhaust is low, the lubricating oil separated by the oil separation device 2 has low purity and poor lubricating ability.

[0056] Specifically, the screw compressor system includes a first oil supply branch 100 and a second oil supply branch 200. The first end of the first oil supply branch 100 communicates with the second opening 312, and the second end of the first oil supply branch 100 communicates with the rotor cavity 11; the first end of the second oil supply branch 200 communicates with the third opening, and the second end of the second oil supply branch 200 communicates with the rotor cavity 11. For example, the second end of the second oil supply branch 200 communicates with the front bearing cavity 121 and the rear bearing cavity 122 respectively through two branches.

[0057] Optionally, the screw compressor system can be applied to a heat pump system or a refrigeration system. Both the heat pump system and the refrigeration system can heat or cool. For example, as Figure 3 shown, the evaporator 6 is connected to the intake port of the screw compressor 1, the exhaust port 102 of the screw compressor 1 is connected to the gaseous refrigerant inlet 22, and the gaseous refrigerant outlet 23 is connected to the condenser 7. By increasing the exhaust temperature of the compressor, the energy efficiency of the heat pump system or the refrigeration system can be improved. Optionally, the oil separation device 2 can adopt a centrifugal lubricating oil separation structure, or other lubricating oil separation structures such as a filtration type, a packing type, or a washing type.

[0058] Optionally, the oil cooling device 3 may include a heat exchanger, a heat pipe, etc. For example, the lubricating oil circulation pipeline 31 and the cooling component 32 may be two heat exchange pipelines of the heat exchanger respectively. Optionally, the cooling component 32 may adopt any cooling method such as air cooling, liquid cooling, or refrigerant cooling. The cooling component 32 may include a plurality of cooling parts, such as two, or may only include one cooling part. The cooling power of the cooling component 32 can be adjusted according to the working conditions. For example, corresponding temperature sensors and pressure sensors are set for real-time feedback adjustment.

[0059] Optionally, the lubricating oil circulation pipeline 31 may be arranged in the form of a main pipeline with branch openings provided thereon. For example, the lubricating oil circulation pipeline 31 includes a first pipe section and a second pipe section. The first pipe section is connected between the first opening 311 and the second opening 312, and the second pipe section is connected between the second opening 312 and the third opening 313. In the above layout, the cooling component 32 may include two cooling parts to cool the first pipe section and the second pipe section respectively, or may only be provided with one cooling part to uniformly cool the first pipe section and the second pipe section. Since the lubricating oil at the second opening 312 leaves the oil cooling device earlier than the lubricating oil at the third opening 313, the cooling time of the lubricating oil at the second opening 312 is shorter, and the first temperature is higher than the second temperature.

[0060] Optionally, the lubricating oil circulation pipeline 31 may also be arranged in the form of two parallel branches. For example, the lubricating oil circulation pipeline 31 includes a first pipe section and a second pipe section. The first pipe section is connected between the first opening 311 and the second opening 312, and the second pipe section is connected between the first opening 311 and the third opening 313. In the above layout, the cooling component 32 may include two cooling parts to cool the first pipe section and the second pipe section respectively, so that the lubricating oil temperatures at the second opening 312 and the third opening 313 are different, that is, the lubricating oil temperatures are respectively reduced from the initial temperature at the oil outlet 21 to the first temperature and from the initial temperature to the second temperature.

[0061] In the screw compressor system of this embodiment, lubricating oil at different temperatures is supplied to different parts of the compressor, which can avoid the mutual interference of the lubricating oil supply states of different parts; by supplying lubricating oil at the first temperature to the rotor cavity 11 and supplying lubricating oil at the second temperature lower than the first temperature to the bearing cavity 12, it can not only meet the demand for low-temperature lubricating oil in the bearing cavity 12, optimize the bearing lubrication effect, and extend the bearing service life; but also avoid the lubricating oil at too low a temperature entering the rotor cavity and excessively reducing the refrigerant temperature, thereby avoiding the compressor exhaust temperature dropping to the dangerous range. Furthermore, it can improve the separation ability of the lubricating oil from the gaseous refrigerant, improve the purity and lubricating ability of the lubricating oil, and achieve both the lubricating oil cooling demand of the compressor bearing cavity and the compressor exhaust temperature.

[0062] When a screw compressor system is applied to a heat pump system, it can improve the heating capacity and energy efficiency of the heat pump system while meeting the lubricating oil cooling requirements of the compressor bearing cavity.

[0063] In some embodiments, as Figure 1 shown, the lubricating oil circulation pipeline 31 includes a first pipe section and a second pipe section. The first pipe section is connected between the first opening 311 and the second opening 312, and the second pipe section is connected between the second opening 312 and the third opening 313.

[0064] Specifically, the lubricating oil circulation pipeline 31 adopts a main pipeline with branch openings provided thereon. Optionally, the cooling assembly 32 can include two cooling components to cool the first pipe section and the second pipe section respectively, which can improve the flexibility of adjusting the lubricating oil temperature; or only one cooling component can be provided to cool the first pipe section and the second pipe section uniformly. Since the lubricating oil at the second opening 312 leaves the oil cooling device earlier than the lubricating oil at the third opening 313, the cooling time of the lubricating oil at the second opening 312 is shorter, and the temperature of the lubricating oil supplied at the second opening 312 is higher.

[0065] This embodiment optimizes the layout of the lubricating oil circulation pipeline 31, which can provide convenient conditions for the setting of the cooling assembly 32, and further improve the flexibility of the cooling assembly 32 to adjust the lubricating oil temperature of different pipe sections; different temperatures of lubricating oil are supplied to different parts of the compressor. The lubricating oil at the first temperature is supplied to the rotor cavity 11 through the second opening 312, and the lubricating oil at the second temperature lower than the first temperature is supplied to the bearing cavity 12 through the third opening 313, which can take into account the lubricating oil cooling requirements of the compressor bearing cavity and the compressor exhaust temperature.

[0066] In some embodiments, as Figure 1 shown, the cooling assembly 32 includes a first cooling component 321 and a second cooling component 322. The first cooling component 321 is configured to cool the lubricating oil flowing through the first pipe section, and the second cooling component 322 is configured to cool the lubricating oil flowing through the second pipe section. The first cooling component 321 and the second cooling component 322 work independently.

[0067] Specifically, the first cooling component 321 is used to reduce the lubricating oil from the initial temperature to the first temperature, and the second cooling component 322 is used to reduce the lubricating oil from the first temperature to the second temperature.

[0068] Optionally, the cooling powers of the first cooling component 321 and the second cooling component 322 can be independently adjusted according to needs, for example, by setting corresponding temperature sensors and pressure sensors, etc. to perform negative feedback regulation on the lubricating oil supply state according to the real-time working conditions.

[0069] Optionally, if the second cooling component 322 increases the cooling power while the cooling power of the first cooling component 321 remains unchanged, it is possible to only reduce the lubricating oil temperature at the third opening 313 while keeping the lubricating oil temperature at the second opening 312 unchanged.

[0070] Optionally, if it is necessary to reduce the lubricating oil temperature at the second opening 312, only the first cooling component 321 needs to increase the cooling power without adjusting the cooling power of the second cooling component 322. Or the cooling power of the second cooling component 322 can be reduced to keep the lubricating oil temperature at the third opening 313 unchanged. Compared with the setting method of only one cooling component for the entire pipeline, it can save costs and enable the adjustment of the lubricating oil temperature at the third opening 313 to be independent of the lubricating oil temperature at the second opening 312.

[0071] This embodiment adopts a segmented cooling method. By setting two cooling components to cool two pipe segments respectively, it is convenient to independently adjust the lubricating oil temperature according to the working conditions, which can improve the flexibility of adjusting the lubricating oil temperature at the second opening 312 and the third opening 313. By independently adjusting the lubricating oil temperature at the second opening 312 and the third opening 313, it is convenient to adjust according to the real-time working conditions, further avoiding the mutual interference of the lubricating oil supply states, and better meeting the lubricating oil cooling requirements of the compressor bearing cavity and the compressor exhaust temperature.

[0072] In some embodiments, the first cooling component 321 is configured to reduce the cooling power when the actual exhaust superheat of the screw compressor 1 is less than the preset superheat, and keep the cooling power unchanged or increase the cooling power when the actual exhaust superheat is not less than the preset superheat.

[0073] Specifically, the preset superheat can be determined according to the reasonable dilution degree of the lubricating oil. When the actual exhaust superheat of the screw compressor 1 is less than the preset superheat, the first cooling component 321 reduces the cooling power, which can increase the lubricating oil temperature at the second opening 312. When the lubricating oil at a higher first temperature is injected into the rotor cavity 11, it can reduce the cooling effect of the lubricating oil on the refrigerant, thereby increasing the exhaust temperature of the compressor and raising the actual exhaust superheat.

[0074] When the actual exhaust superheat of the screw compressor 1 is greater than the preset superheat, increasing the cooling power or keeping the cooling power unchanged for the first cooling component 321 can both reduce the lubricating oil temperature at the second opening 312. When the lubricating oil at a lower first temperature is injected into the rotor cavity 11, it can reduce the exhaust temperature of the compressor and lower the actual exhaust superheat.

[0075] When the actual superheat degree of exhaust of the screw compressor 1 or when it is equal to the preset superheat degree for a period of time, the lubricating oil supply of the screw compressor system has reached a dynamic balance under the current working conditions, and the cooling power of the first cooling component 321 can be kept unchanged; when the actual superheat degree of exhaust is temporarily equal to the preset superheat degree, corresponding adjustment can be made according to the change rate of the actual superheat degree of exhaust or the change at the next moment.

[0076] Optionally, when the first cooling component 321 is a fan, the adjustment of the cooling power of the first cooling component 321 can be achieved by adjusting the fan speed. Optionally, a fourth temperature sensor 44 can be arranged on the first oil supply branch 100 to more accurately obtain the first temperature and adjust the magnitude of the first temperature according to the comparison result between the actual superheat degree of exhaust and the preset superheat degree of exhaust. According to the bearing requirements, the cooling power of the second cooling component 322 can be reduced or kept unchanged.

[0077] The first cooling component 321 of this embodiment adjusts the cooling power according to the comparison result between the actual superheat degree of exhaust and the preset superheat degree of exhaust, can targetedly adjust the first temperature of the lubricating oil at the second opening 312, can achieve both the superheat degree of exhaust of the compressor and the cooling requirements of the lubricating oil in the bearing cavity of the compressor, and can improve the automation level of the screw compressor system.

[0078] The first temperature sensor 41 and the first pressure sensor 51 are both arranged at the exhaust port 102 of the screw compressor 1. The first temperature sensor 41 is configured to detect the exhaust temperature, and the first pressure sensor 51 is configured to detect the exhaust pressure to calculate the actual superheat degree of exhaust according to the exhaust temperature and the exhaust pressure.

[0079] This embodiment can provide a determination basis for the adjustment of the cooling power of the first cooling component 321 by calculating the actual superheat degree of exhaust in real time according to the exhaust temperature and the exhaust pressure, can improve the automation level of the screw compressor system, and improve the timeliness and accuracy of adjusting the cooling power of the first cooling component 321.

[0080] In some embodiments, as Figure 1 shown, the screw compressor system further includes:

[0081] A second temperature sensor 42, configured to detect the second temperature of the lubricating oil at the third opening 313;

[0082] Wherein, the second cooling component 322 is configured to increase the cooling power when the second temperature is greater than the target lubricating oil temperature, and keep the cooling power unchanged or reduce the cooling power when the second temperature is not greater than the target lubricating oil temperature.

[0083] Specifically, the target lubricating oil temperature is the temperature of the lubricating oil supplied to the bearing chamber 12, and the target lubricating oil temperature can be determined by the viscosity curve of the lubricating oil itself at different temperatures and pressures. When the second temperature is greater than the target lubricating oil temperature, it indicates that the lubricating oil temperature in the current bearing chamber is too high, resulting in too low a viscosity of the lubricating oil. The second cooling component 322 increases the cooling power, which can reduce the temperature of the lubricating oil at the third opening 313. When the lubricating oil at the lower second temperature is injected into the bearing chamber 12, the temperature of the lubricating oil in the bearing chamber 12 can be reduced, increasing the viscosity of the lubricating oil.

[0084] When the second temperature is less than the target lubricating oil temperature, it indicates that the lubricating oil temperature in the current bearing chamber is too low, resulting in too high a viscosity of the lubricating oil. The second cooling component 322 reduces the cooling power, which can increase the temperature of the lubricating oil at the third opening 313. When the lubricating oil at the higher second temperature is injected into the bearing chamber 12, the reduction in the temperature of the lubricating oil in the bearing chamber 12 can be reduced, or rather, the relative increase in the temperature of the lubricating oil in the bearing chamber 12 can be achieved, thereby reducing the viscosity of the lubricating oil. When the viscosity of the lubricating oil is too high, the second cooling component 322 can also keep the cooling power unchanged, enabling the compressor to operate at a high lubricating oil viscosity, but the power consumption of the motor 14 will increase.

[0085] When the second temperature is equal to the target lubricating oil temperature, if they are equal for a period of time, the screw compressor system reaches dynamic equilibrium, keeping the cooling power of the second cooling component 322 unchanged. If they are only temporarily equal, the second cooling component 322 can make corresponding adjustments according to the rate of change of the second temperature or the change situation at the next moment.

[0086] Optionally, when the second cooling component 322 is a fan, the adjustment of the cooling power of the second cooling component 322 can be achieved by adjusting the fan speed.

[0087] The second cooling component 322 of this embodiment adjusts the cooling power according to the comparison result between the second temperature and the target lubricating oil temperature, and can specifically adjust the second temperature of the lubricating oil at the third opening 313 independently of the lubricating oil at the second opening 312, avoiding interference in the lubricating oil supply state, being able to balance the lubricating oil cooling requirements of the compressor bearing chamber and the exhaust temperature of the compressor, and also helping to improve the automation level of the screw compressor system.

[0088] In some embodiments, as Figure 1 shown, the screw compressor system further includes:

[0089] A second pressure sensor 52, configured to detect the lubricating oil pressure at the third opening 313 to obtain the target lubricating oil temperature based on the lubricating oil pressure and the preset minimum viscosity of the lubricating oil.

[0090] In this embodiment, the lubricating oil pressure at the third opening 313 is detected by the second pressure sensor 52, and the target lubricating oil temperature of the lubricating oil is determined by combining the preset minimum viscosity of the lubricating oil that can ensure bearing lubrication. By updating the target lubricating oil temperature in real time, a judgment basis can be provided for adjusting the cooling power of the second cooling component 322, which can improve the automation level of the screw compressor system and enhance the timeliness and accuracy of adjusting the cooling power of the second cooling component 322.

[0091] In some embodiments, the cooling assembly 32 is further configured to reduce the cooling power when the actual exhaust superheat of the screw compressor 1 is less than the preset superheat, and keep the cooling power unchanged or increase the cooling power when the actual exhaust superheat is not less than the preset superheat.

[0092] Specifically, the cooling assembly 32 cools the lubricating oil in the entire lubricating oil flow pipeline 31. When the actual exhaust superheat of the screw compressor 1 is less than the preset superheat, the cooling assembly 32 reduces the cooling power, which can increase the lubricating oil temperature at the second opening 312. When the lubricating oil at a higher first temperature is injected into the rotor cavity 11, the cooling effect of the lubricating oil on the refrigerant can be reduced, thereby increasing the exhaust temperature of the compressor and raising the actual exhaust superheat. Correspondingly, the cooling power adjustment principle of the cooling assembly 32 is similar to the case of setting the first cooling component 321, and will not be elaborated here.

[0093] The cooling assembly 32 of this embodiment adjusts the cooling power according to the comparison result between the actual exhaust superheat and the preset exhaust superheat, which can targetedly adjust the first temperature of the lubricating oil at the second opening 312, reduce the number of cooling components, and simplify the control complexity of the screw compressor system.

[0094] During the research process, the inventors found that in the related art, the bearing cavity, the rotor cavity, and the loading and unloading cavity are supplied with oil uniformly, and there is only one oil supply port for the compressor to the outside. The oil supply amounts to different parts are adjusted by the throttle orifice plugs inside the compressor, and the temperature and pressure states of the lubricating oil supplied to different parts are the same.

[0095] In some embodiments, as Figure 1 shown, the screw compressor 1 further includes a third oil supply branch 300. The screw compressor 1 further includes a loading and unloading cavity 13. The first end of the third oil supply branch 300 communicates with the loading and unloading cavity 13, and the second end of the third oil supply branch 300 communicates between the oil outlet 21 and the first opening 311.

[0096] Specifically, the lubricating oil at the initial temperature flowing out from the oil outlet 21 is supplied to the loading and unloading chamber 13 through the third oil supply branch 300. Through the loading and unloading valve inside the loading and unloading chamber 13, the compressor loading and unloading is automatically controlled according to the required load. Compared with the temperature requirements of the lubricating oil entering the bearing chamber 12 and the rotor chamber 11, the lubricating oil entering the loading and unloading chamber 13 has less temperature requirements, and it can push the piston to move the load regulating slide valve to different positions.

[0097] Specifically, after the lubricating oil enters the loading and unloading chamber 13, it flows through the compressor air inlet 101, participates in work in the rotor chamber, and reaches the compressor air outlet 102. Optionally, the refrigerant oil supplied to the loading and unloading chamber 13 can be controlled by a loading and unloading solenoid valve.

[0098] In this embodiment, since the loading and unloading chamber 13 is connected between the oil outlet 21 and the first opening 311, the lubricating oil at the initial temperature can be used to meet the lubricating oil requirements of the loading and unloading chamber 13, without the need for additional cooling of the lubricating oil, which can reduce the cooling energy consumption of the oil cooling device 3, and further reduce the energy consumption of the screw compressor system.

[0099] In some embodiments,

[0100] the loading and unloading chamber 13 can be selectively connected to the second opening 312; and / or

[0101] the loading and unloading chamber 13 can be selectively connected to the third opening 313.

[0102] Specifically, if the lubricating oil in the loading and unloading chamber 13 of the compressor also needs to be cooled, at this time, the lubricating oil in the loading and unloading chamber 13 can be cooled by the low-temperature lubricating oil at the second opening 312 and / or the low-temperature lubricating oil at the third opening 313. Optionally, the lubricating oil circuit entering the loading and unloading chamber 13 can also be cooled by additionally setting a cooling component.

[0103] In this embodiment, since the loading and unloading chamber 13 can be selectively connected to the second opening 312 and / or the loading and unloading chamber 13 can be selectively connected to the third opening 313, the lubricating oil can be cooled when the temperature in the loading and unloading chamber 13 exceeds the safety temperature of the non-metallic device, which can improve the safety of the loading and unloading chamber 13 under extreme working conditions, and further improve the reliability of the screw compressor system.

[0104] In some embodiments, the cooling component 32 adopts at least one of air cooling, liquid cooling or refrigerant cooling.

[0105] Specifically, the first cooling component 321 can adopt at least one of air cooling, liquid cooling or refrigerant cooling, and the second cooling component 322 can also adopt at least one of air cooling, liquid cooling or refrigerant cooling.

[0106] In this embodiment, the cooling assembly 32 uses at least one of air cooling, liquid cooling, or refrigerant cooling. The cooling methods of the first cooling component 321 and the second cooling component 322 can be set or combined as needed, and reliable and effective cooling of the lubricating oil temperature in the lubricating oil circulation pipeline 31 can be achieved.

[0107] In some embodiments, as Figure 1 shown, the screw compressor system further includes:

[0108] A third temperature sensor 43 configured to detect the third temperature of the bearing in the bearing cavity 12; and

[0109] A throttle valve 30 provided on the second oil supply branch 200. The throttle valve 30 is configured to increase the opening or keep the opening unchanged when the third temperature is greater than the target bearing temperature, and decrease the opening when the third temperature is not greater than the target bearing temperature.

[0110] Specifically, the third temperature sensor 43 can be provided in the front bearing cavity 121 and / or the rear bearing cavity 122. The throttle valve 30 has little influence on the pressure of the lubricating oil at the third opening 313 and can be ignored. Specifically, when the third temperature is greater than the target bearing temperature, the throttle valve increases the opening or keeps the opening unchanged, which can increase or keep the flow rate of the lubricating oil entering the bearing cavity 12 unchanged, enable the low-temperature lubricating oil at the second temperature to enter the bearing cavity 12, and thus reduce the bearing temperature.

[0111] When the third temperature is less than the target bearing temperature, the throttle valve decreases the opening, which can reduce the flow rate of the lubricating oil entering the bearing cavity 12, weaken the cooling effect, and thus increase the bearing temperature. When the third temperature is equal to the target bearing temperature, adaptive adjustment can be made according to whether it is equal for a period of time or temporarily equal.

[0112] Specifically, the second oil supply branch 200 includes a main road and two branches. The first end of the main road is connected to the third opening 313, the second end of the main road is connected to the two branches, and the two branches are respectively connected to the front bearing cavity 121 and the rear bearing cavity 122. The throttle valve 30 is provided on the main road.

[0113] The throttle valve 30 of this embodiment adjusts the opening according to the comparison result of the third temperature and the target bearing temperature, can perform targeted adjustment on the bearing temperature, and can improve the automation level of the screw compressor system.

[0114] Secondly, the present disclosure proposes a heat pump system, including:

[0115] The screw compressor system of the above embodiment;

[0116] An evaporator 6 connected to the air inlet 101 of the screw compressor 1; and

[0117] A condenser 7 is connected to the gaseous refrigerant outlet 23 of the oil separation device 2.

[0118] For the heat pump system of this embodiment, its screw compressor system supplies lubricating oil at different temperatures to different parts of the compressor, which can avoid the mutual interference of the lubricating oil supply states of different parts, achieve both the lubricating oil cooling requirement of the compressor bearing cavity and the compressor exhaust temperature, and can improve the heating capacity and energy efficiency of the heat pump system on the premise of meeting the lubricating oil cooling requirement of the compressor bearing cavity.

[0119] During the research process, the inventor found that in the work of replacing environmentally friendly refrigerants in high-temperature heat pumps in recent years, the exhaust superheat of the operation of new environmentally friendly refrigerants with large molecular weights is in a relatively low range. In this state, it is more difficult to separate, collect, and purify the lubricating oil from the oil separation device 2, and the influence of the lubricating oil temperature on the exhaust superheat is greater.

[0120] In some embodiments, the refrigerant includes environmentally friendly refrigerants.

[0121] Optionally, the large molecular weight environmentally friendly refrigerants include R1233zd(E) and R245fa, etc.

[0122] The refrigerant of this embodiment uses large molecular weight environmentally friendly refrigerants, and the exhaust superheat itself is relatively low. By the screw compressor system, both the compressor exhaust superheat and the lubricating oil cooling requirement of the compressor bearing cavity are taken into account, and the effect is better, which can further improve the heating capacity and energy efficiency of the heat pump system.

[0123] In addition, the present disclosure also proposes a control method for the screw compressor system based on the above embodiment. The lubricating oil circulation pipeline 31 includes a first pipe section and a second pipe section, and the cooling assembly 32 includes a first cooling component 321 and a second cooling component 322. The first cooling component 321 is configured to cool the lubricating oil flowing through the first pipe section, and the second cooling component 322 is configured to cool the lubricating oil flowing through the second pipe section. The control method includes:

[0124] Judge whether the actual exhaust superheat of the screw compressor 1 is greater than the preset superheat;

[0125] When the actual exhaust superheat is less than the preset superheat, reduce the cooling power of the first cooling component 321;

[0126] When the actual exhaust superheat is not less than the preset superheat, keep the cooling power of the first cooling component 321 unchanged or increase the cooling power.

[0127] Specifically, when the actual exhaust superheat degree of the screw compressor 1 is less than the preset superheat degree, reducing the cooling power of the first cooling component 321 can increase the lubricating oil temperature at the second opening 312, reduce the cooling effect of the lubricating oil on the refrigerant, and further increase the exhaust temperature of the compressor, thereby increasing the actual exhaust superheat degree.

[0128] When the actual exhaust superheat degree of the screw compressor 1 is greater than the preset superheat degree, increasing the cooling power of the first cooling component 321 or keeping the cooling power unchanged can both reduce the lubricating oil temperature at the second opening 312. When the lubricating oil at a lower first temperature is injected into the rotor cavity 11, the exhaust temperature of the compressor can be reduced, and the actual exhaust superheat degree can be decreased.

[0129] The control method of this embodiment adjusts the cooling power according to the comparison result between the actual exhaust superheat degree and the preset exhaust superheat degree, can specifically adjust the first temperature of the lubricating oil at the second opening 312, and can achieve a balance between the exhaust superheat degree of the compressor and the cooling requirement of the lubricating oil in the compressor bearing cavity.

[0130] In some embodiments, before determining whether the actual exhaust superheat degree of the screw compressor 1 is greater than the preset superheat degree, it further includes:

[0131] Obtaining the exhaust temperature detected by the first temperature sensor 41;

[0132] Obtaining the exhaust pressure detected by the first pressure sensor 51;

[0133] Calculating the actual exhaust superheat degree according to the exhaust temperature and the exhaust pressure.

[0134] The control method of this embodiment can provide a determination basis for adjusting the cooling power of the first cooling component 321 by calculating the actual exhaust superheat degree in real time according to the exhaust temperature and the exhaust pressure, and can improve the timeliness and accuracy of adjusting the cooling power of the first cooling component 321.

[0135] In some embodiments, the control method further includes:

[0136] Obtaining the second temperature of the lubricating oil at the third opening 313 detected by the second temperature sensor 42 and obtaining the target lubricating oil temperature;

[0137] When the second temperature is greater than the target lubricating oil temperature, increasing the cooling power of the second cooling component 322;

[0138] When the second temperature is not greater than the target lubricating oil temperature, keeping the cooling power of the second cooling component 322 unchanged or reducing the cooling power.

[0139] Specifically, the target lubricating oil temperature is the temperature of the lubricating oil supplied to the bearing chamber 12, and the target lubricating oil temperature can be determined by the viscosity curve of the lubricating oil itself at different temperatures and pressures. When the second temperature is greater than the target lubricating oil temperature, it indicates that the viscosity of the lubricating oil in the current bearing chamber 12 is too low. The second cooling component 322 increases the cooling power, which can reduce the temperature of the lubricating oil at the third opening 313 and increase the viscosity of the lubricating oil.

[0140] When the second temperature is less than the target lubricating oil temperature, it indicates that the viscosity of the lubricating oil in the current bearing chamber is too high. The second cooling component 322 reduces the cooling power, which can increase the temperature of the lubricating oil at the third opening 313 and reduce the viscosity of the lubricating oil.

[0141] The control method of this embodiment adjusts the cooling power according to the comparison result between the second temperature and the target lubricating oil temperature, can specifically adjust the second temperature of the lubricating oil at the third opening 313, and can achieve both the lubricating oil cooling requirement of the compressor bearing chamber and the compressor exhaust temperature.

[0142] In some embodiments, obtaining the target lubricating oil temperature further includes:

[0143] Obtaining the lubricating oil pressure at the third opening 313 detected by the second pressure sensor 52;

[0144] Obtaining the target lubricating oil temperature according to the lubricating oil pressure and the preset minimum viscosity of the lubricating oil.

[0145] The control method of this embodiment determines the target lubricating oil temperature of the lubricating oil through the lubricating oil pressure at the third opening 313 in combination with the preset minimum viscosity of the lubricating oil, which can provide a judgment basis for adjusting the cooling power of the second cooling component 322 and improve the timeliness and accuracy of adjusting the cooling power of the second cooling component 322.

[0146] In some embodiments, the screw compressor system further includes a throttle valve 30 provided on the second oil supply branch 200, and the control method further includes:

[0147] Obtaining the third temperature of the bearing in the bearing chamber 12 detected by the third temperature sensor 43;

[0148] When the third temperature is greater than the target bearing temperature, the throttle valve 30 is made to increase the opening or keep the opening unchanged;

[0149] When the third temperature is not greater than the target bearing temperature, the throttle valve 30 is made to reduce the opening.

[0150] Specifically, when the third temperature is greater than the target bearing temperature, the throttle valve 30 increases its opening or keeps the opening unchanged, which can increase or keep the lubricating oil flow rate into the bearing chamber 12 unchanged, allowing the low-temperature lubricating oil at the second temperature to enter the bearing chamber 12, thereby reducing the bearing temperature in the bearing chamber 12. When the third temperature is less than the target bearing temperature, the throttle valve 30 reduces its opening, which can reduce the lubricating oil flow rate into the bearing chamber 12, weaken the cooling effect, and thereby increase the bearing temperature in the bearing chamber 12.

[0151] The control method of this embodiment adjusts the opening of the throttle valve 30 according to the comparison result between the third temperature and the target bearing temperature, and can perform targeted adjustment on the bearing temperature in the bearing chamber 12.

[0152] The above has introduced in detail a screw compressor system and a heat pump system provided by the present disclosure. Specific embodiments are used herein to elaborate on the principle and implementation manner of the present disclosure. The description of the above embodiments is only used to help understand the method and its core idea of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall within the protection scope of the claims of the present disclosure.

Claims

1. A screw compressor system, characterized in that: include: A screw compressor (1) comprises a rotor chamber (11) and a bearing chamber (12); an oil separation device (2) connected to the exhaust port (102) of the screw compressor (1), the oil separation device (2) being configured to separate lubricating oil from gaseous refrigerant, the oil separation device (2) comprising an oil outlet (21) for allowing the lubricating oil to flow out; and An oil cooling device (3) comprises a lubricating oil circulation pipeline (31) and a cooling assembly (32), wherein the cooling assembly (32) is configured to cool the lubricating oil flowing through the lubricating oil circulation pipeline (31), wherein a first opening (311) and a third opening (313) are respectively provided at two ends of the lubricating oil circulation pipeline (31), and a second opening (312) is provided between the first opening (311) and the third opening (313), wherein the first opening (311) is connected to the oil outlet (21), the second opening (312) supplies lubricating oil at a first temperature to the rotor cavity (11) through a first oil supply branch (100), and the third opening (313) supplies lubricating oil at a second temperature to the bearing cavity (12) through a second oil supply branch (200), wherein the first temperature is higher than the second temperature.

2. The screw compressor system according to claim 1, characterized in that: The lubricating oil circulation pipeline (31) comprises a first pipe section and a second pipe section, the first pipe section is connected between the first opening (311) and the second opening (312), and the second pipe section is connected between the second opening (312) and the third opening (313).

3. The screw compressor system according to claim 2, characterized in that: The cooling assembly (32) comprises a first cooling component (321) and a second cooling component (322); the first cooling component (321) is configured to cool the lubricating oil flowing through the first pipe section; the second cooling component (322) is configured to cool the lubricating oil flowing through the second pipe section; the first cooling component (321) and the second cooling component (322) operate independently.

4. The screw compressor system according to claim 3, characterized in that: The first cooling component (321) is configured to reduce the cooling power when the actual exhaust gas superheat of the screw compressor (1) is less than a preset superheat, and to keep the cooling power unchanged or increase the cooling power when the actual exhaust gas superheat is not less than the preset superheat.

5. The screw compressor system according to claim 4, characterized in that: Also includes: A first temperature sensor (41) and a first pressure sensor (51) are both arranged at the exhaust port (102) of the screw compressor (1); the first temperature sensor (41) is configured to detect the exhaust temperature, and the first pressure sensor (51) is configured to detect the exhaust pressure, so as to calculate the actual exhaust superheat according to the exhaust temperature and the exhaust pressure.

6. The screw compressor system according to claim 3, characterized in that: Also includes: A second temperature sensor (42) configured to detect the second temperature of the lubricating oil at the third opening (313); The second cooling component (322) is configured to increase cooling power when the second temperature is greater than a target lubricating oil temperature, and to keep cooling power unchanged or reduce cooling power when the second temperature is not greater than the target lubricating oil temperature.

7. The screw compressor system according to claim 6, characterized in that: Also includes: The second pressure sensor (52) is configured to detect the lubricating oil pressure of the third opening (313) to obtain the target temperature according to the lubricating oil pressure and a preset lubricating oil minimum viscosity.

8. The screw compressor system according to claim 1, characterized in that: The cooling component (32) is also configured to reduce the cooling power when the actual exhaust gas superheat of the screw compressor (1) is less than a preset superheat, and to keep the cooling power unchanged or increase the cooling power when the actual exhaust gas superheat is not less than the preset superheat.

9. The screw compressor system according to any one of claims 1 to 8, characterized in that: The screw compressor (1) further comprises a third oil supply branch (300), the screw compressor (1) further comprising a loading and unloading chamber (13), a first end of the third oil supply branch (300) being in communication with the loading and unloading chamber (13), and a second end of the third oil supply branch (300) being in communication between the oil outlet (21) and the first opening (311).

10. The screw compressor system according to claim 9, characterized in that The loading and unloading chamber (13) may be selectively connected to the second opening (312); and / or The loading and unloading chamber (13) may be selectively connected to the third opening (313).

11. The screw compressor system according to any one of claims 1 to 8, characterized in that: The cooling component (32) adopts at least one of air cooling, liquid cooling or refrigerant cooling.

12. The screw compressor system according to any one of claims 1 to 8, characterized in that: Also includes: a third temperature sensor (43) configured to detect a third temperature of the bearing in the bearing cavity (12); and A throttle valve (30) is provided on the second oil supply branch (200), and the throttle valve (30) is configured to increase the opening or keep the opening unchanged when the third temperature is greater than the target bearing temperature, and to reduce the opening when the third temperature is not greater than the target bearing temperature.

13. A heat pump system, characterized in that: include: The screw compressor system according to any one of claims 1 to 12; An evaporator (6) connected to an air inlet (101) of the screw compressor (1); and The condenser (7) is connected to the gaseous refrigerant outlet (23) of the oil separation device (2).

14. The heat pump system according to claim 13, characterized in that: The refrigerant includes an environmentally friendly refrigerant.

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