Fluid flow control of compressor lubrication system

Abstract

To supply a lubrication fluid to intended locations within an HVAC&R system in accordance with conditions within a compressor.SOLUTION: A fluid pressure control system 110 for a compressor 32 includes a pump 90 configured to direct a lubricant toward a bearing 96 of the compressor, and a sensor 112 configured to provide feedback indicative of a speed of a shaft 94 of the compressor, where the shaft is configured to be at least partially supported by the bearing. The fluid pressure control system also includes a non-transitory computer readable medium having executable instructions that, when executed by a processor 44, are configured to cause the processor to receive a signal indicative of the speed of the shaft from the sensor and adjust operation of the pump based on the signal.SELECTED DRAWING: Figure 6

Description

Related Applications

[0001] Cross - References to Related Applications This application claims the priority and benefit of U.S. Provisional Patent Application No. 62 / 834,871, filed Apr. 16, 2019, "FLUID PRESSURE CONTROL FOR A COMPRESSOR", which is hereby incorporated by reference in its entirety for all purposes. BACKGROUND OF THE INVENTION

[0002] This section is intended to introduce the reader to various technical aspects that may be relevant to the various aspects of the present disclosure described hereinafter. This discussion is thought to be useful in providing the reader with background information to enhance understanding of the various aspects of the present disclosure. Accordingly, it should be understood that these statements are not an admission of prior art and should be read from the above perspective.

[0003] Heating, ventilation, air conditioning, and / or refrigeration (HVAC&R) systems are used in a variety of facilities and for many purposes. For example, an HVAC&R system may include a vapor compression refrigeration system (e.g., a refrigerant circuit having a condenser, an evaporator, a compressor, and / or an expander) configured to condition an environment. The vapor compression refrigeration system may include a lubrication circuit that directs a lubricating fluid (e.g., oil) into the compressor to lubricate various components of the compressor (e.g., bearings). Conditions within the compressor, such as temperature and pressure, can change during operation of the compressor. Unfortunately, existing HVAC&R systems may supply the lubricating fluid to the compressor at a constant pressure, and thus, as the conditions within the compressor change, there is a risk that the lubricating fluid may flow to unintended locations within the HVAC&R system. SUMMARY OF THE INVENTION MEANS FOR SOLVING THE PROBLEM

[0004] In one embodiment of the present disclosure, a compressor fluid pressure control system includes a pump configured to guide lubricant toward a compressor bearing and a sensor configured to provide feedback indicating the speed of the compressor shaft, the shaft being at least partially supported by the bearing. The fluid pressure control system also includes a non-temporary computer-readable medium having executable instructions configured to cause the processor, if executed by the processor, to receive a signal indicating the shaft speed from the sensor and adjust the operation of the pump based on the signal.

[0005] In one embodiment of the present disclosure, a compressor fluid pressure control system includes a pump configured to guide lubricant toward a compressor bearing, a sensor configured to provide feedback indicating the temperature of the bearing in the compressor, and at least one non-temporary computer-readable medium having executable instructions configured, if executed by a processor, to cause the processor to receive a signal from the sensor indicating the temperature of the bearing in the compressor and adjust the speed of the pump based on the signal.

[0006] In one embodiment of the present disclosure, a compressor fluid pressure control system includes a pump configured to guide lubricant toward the compressor bearings, a first sensor configured to provide feedback indicating the speed of the compressor shaft, and a second sensor configured to provide feedback indicating the temperature of the bearings within the compressor. The shaft is configured to be at least partially supported by the bearings. The fluid pressure control system also causes a processor, if executed by a processor, to receive a first signal representing the shaft speed from the first sensor and a second signal indicating the temperature of the bearings within the compressor. It includes at least one non-temporary computer-readable medium having executable instructions configured to receive a signal from a second sensor and adjust the pump speed based on the first signal, the second signal, or both. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of a building where an embodiment of a heating, ventilation, air conditioning, and / or refrigeration (HVAC&R) system in a commercial facility, according to one aspect of the present disclosure, can be used. [Figure 2] This is a perspective view of one embodiment of an HVAC&R system according to one aspect of the present disclosure. [Figure 3] This is a schematic diagram of one embodiment of a vapor compression system according to one aspect of the present disclosure. [Figure 4] This is a schematic diagram of another embodiment of a vapor compression system according to one aspect of the present disclosure. [Figure 5] This is a schematic diagram of one embodiment of a steam compression system having a storage tank according to one aspect of the present disclosure. [Figure 6] This is a schematic diagram of one embodiment of a vapor compression system having a fluid pressure control system according to one aspect of the present disclosure. [Figure 7] This is a flowchart illustrating one embodiment of the process for operating a fluid pressure control system for a vapor compression system, according to one aspect of the present disclosure. [Figure 8] This is a flowchart illustrating one embodiment of the process for operating a fluid pressure control system for a vapor compression system, according to one aspect of the present disclosure. [Figure 9] This is a flowchart illustrating one embodiment of the process for operating a fluid pressure control system for a vapor compression system, according to one aspect of the present disclosure. [Modes for carrying out the invention]

[0008] One or more specific embodiments of this disclosure are described below. These described embodiments are merely examples of the technology disclosed herein. Furthermore, not all features of actual implementations may be described herein in order to provide a concise description of these embodiments. In developing such actual implementations, it should be recognized that, as with any engineering or design project, many implementation-specific decisions must be made to achieve the developer's specific objectives, such as complying with system-related and business-related constraints that may differ from implementation to implementation. Furthermore, it should be recognized that while such development efforts may be complex and time-consuming, they are routine design, manufacturing, and production tasks for those skilled in the art who benefit from this disclosure.

[0009] As described above, the vapor compression system generally includes a refrigerant flowing within the refrigeration circuit. The refrigerant undergoes phase transitions as it flows through multiple conduits and components arranged within the refrigeration circuit, allowing the vapor compression system to adjust the internal space of the structure. The vapor compression system generally includes a lubrication circuit having a fluid (e.g., a lubricant such as oil) that flows through specific components of the refrigeration circuit (e.g., compressor, storage tank, and cooler) to lubricate the compressor of the refrigeration circuit during operation. The compressor includes a shaft coupled to a rotor configured to compress the refrigerant within the compressor. The shaft is supported by at least one bearing, and the fluid of the lubrication circuit generally flows between the shaft and the bearing, configured to lubricate the shaft as it rotates.

[0010] The pump in the lubrication circuit pumps fluid from the reservoir to the compressor within the lubrication circuit. Specifically, the fluid flows from the reservoir to the compressor's bearings and shaft. The pump can pump the fluid within the lubrication circuit (e.g., to the bearings) at a constant flow rate and / or constant pressure. During compressor operation, the shaft speed may vary due to certain factors, such as the compressor's operating mode and / or the operating conditions of the vapor compression system (e.g., the temperature and / or pressure of the refrigerant flowing through the refrigerant circuit, operator input, or a combination thereof). Additionally or alternatively, the temperature of the lubricating fluid in the bearings within the compressor may vary due to the compressor's operating mode and / or the operating parameters of the vapor compression system (e.g., the temperature and / or pressure of the refrigerant flowing through the refrigerant circuit, friction between the compressor shaft and other components (e.g., rotor), or a combination thereof). It can transform.

[0011] The compressor includes seals (e.g., hermetic seals and / or labyrinth seals) designed to contain the fluid that flows through and lubricates the compressor's components (e.g., bearings and / or shafts). However, as the shaft speed and / or temperature in the bearings change, the fluid flowing at a constant flow rate and / or pressure may leak from the compressor's seals. For example, at relatively low shaft speeds and / or temperatures, the fluid pressure in the compressor increases due to the fluid flowing along the bearings and / or shafts at a constant flow rate, which may cause the fluid to leak from the seals. At relatively high shaft speeds and / or temperatures, the fluid may not flow at a speed sufficient to properly lubricate the bearings and / or shafts (e.g., a constant flow rate of fluid may be too slow to properly lubricate the bearings and / or shafts). Insufficient lubrication of the bearings and / or shafts may lead to increased friction, causing the bearings, shafts, and / or compressor to overheat. Thus, a constant flow rate of fluid within the lubrication circuit, combined with changes in shaft speed and / or fluid temperature within the compressor, can reduce the efficiency of the compressor and the vapor compression system.

[0012] Some examples of fluids that can be used as refrigerants in multiple embodiments of the vapor compression system of this disclosure include hydrofluorocarbon (HFC)-based refrigerants such as R-410A, R-407, or R-134a, hydrofluoroolefin (HFO)-based refrigerants such as R-1233 or R-1234, ammonia (NH3), R-717, and carbon dioxide. Natural refrigerants such as CO2, R-744, or refrigerants primarily composed of hydrocarbons, and water vapor. Examples include, or any other suitable refrigerant. In some embodiments, the vapor compression system may be configured to efficiently utilize a refrigerant also called a low-pressure refrigerant, which has a normal boiling point of approximately 19 degrees Celsius (66 degrees Fahrenheit) at 1 atmosphere, compared with a medium-pressure refrigerant such as R-134. As used herein, "normal boiling point" may refer to the boiling point temperature measured at 1 atmosphere. Some examples of fluids that can be used as lubricants in some embodiments of the vapor compression system of this disclosure include synthetic oils, mineral oils, or any other suitable lubricant.

[0013] This disclosure relates to a fluid pressure control system for a compressor in a vapor compression system. Certain embodiments of the fluid pressure control system include sensors for detecting the compressor shaft speed and / or the temperature of the bearings within the compressor. For example, a first sensor may be positioned on the shaft to provide feedback indicating the shaft speed, and / or a second sensor may be positioned on the bearings to provide feedback indicating the temperature of the bearings within the compressor. In certain embodiments, additional sensors may be positioned in the compressor's supply conduit and / or the compressor's discharge conduit to provide feedback indicating the fluid supply temperature and / or the fluid discharge temperature, respectively. Based on the fluid supply temperature and / or fluid discharge temperature, a controller of the fluid pressure control system can determine the temperature of the bearings within the compressor.

[0014] Based on the shaft speed and / or temperature in the bearings within the compressor, the controller of the fluid pressure control system can adjust the flow rate of fluid from the pump to the bearings (e.g., adjust the fluid pressure in the lubrication circuit). The controller can determine a target flow rate based on the shaft speed and / or temperature and adjust the pump speed so that the fluid flow rate approaches the target flow rate. The target flow rate may be a function of the shaft speed and / or temperature in the bearings within the compressor (e.g., a linear function, a nonlinear function, a proportional function, an exponential function, or a combination thereof). As the shaft speed and / or temperature generally decrease, the controller can adjust the pump speed to reduce the fluid flow rate to a generally lower target flow rate. As the shaft speed and / or temperature generally increase, the controller can adjust the pump speed to increase the fluid flow rate to a generally higher target flow rate. It is possible that, as the controller adjusts the fluid flow rate, the operation and / or efficiency of the compressor and the steam compression system may be improved overall. For example, adjusting the fluid flow rate can at least partially block or reduce fluid leakage from the compressor seals and / or reduce friction between the fluid, shaft and / or bearings.

[0015] The control technology disclosed herein can be used in various systems. However, to facilitate discussion, several examples of systems into which the control technology disclosed herein can be incorporated are shown below in Figures 1 to 4.

[0016] Referring here to the drawings, Figure 1 is a perspective view of one embodiment of the environment of a heating, ventilation, and air conditioning (HVAC) system 10 in a typical commercial building 12. The HVAC system 10 may include a vapor compression system 14 that supplies cooled liquid that can be used to cool the building 12. The HVAC system 10 may also include a boiler 16 that supplies warm liquid to heat the building 12 and a ventilation system that circulates air within the building 12. The air circulation system may also include a return air duct 18, an air supply duct 20, and / or an air handler 22. In some embodiments, the air handler 22 may include a heat exchanger connected to the boiler 16 and the vapor compression system 14 by conduits 24. Depending on the operating mode of the HVAC system 10, the heat exchanger in the air handler 22 can receive either a liquid heated from the boiler 16 or a liquid cooled from the vapor compression system 14. The HVAC system 10 is shown with separate air handlers on each floor of the building 12, but in other embodiments, the HVAC system 10 may include air handlers 22 and / or other components that can be shared between floors.

[0017] Figures 2 and 3 show several embodiments of a vapor compression system 14 that can be used in an HVAC system 10. The vapor compression system 14 can circulate a refrigerant through a circuit starting with a compressor 32. The circuit may also include a concentrator 34, an expansion valve(s) or equipment(s) 36, and a liquid cooler or vaporizer 38. The vapor compression system 14 may further include a control panel 40 (e.g., a controller) having an analog-to-digital (A / D) converter 42, a microprocessor 44, non-volatile memory 46, and / or an interface board 48.

[0018] In some embodiments, the vapor compression system 14 can use one or more of a variable speed drive (VSD) 52, a motor 50, a compressor 32, a condenser 34, an expansion valve or device 36, and / or an evaporator 38. The motor 50 can drive the compressor 32 and may be powered from a variable speed drive (VSD) 52. The VSD 52 receives AC power having a particular fixed line voltage and fixed line frequency from an AC power source and supplies power having a variable voltage and frequency to the motor 50. In other embodiments, the motor 50 may be directly powered from an AC or direct current (DC) power source. The motor 50 may include any type of electric motor that can be powered by a VSD or directly from an AC or DC power source, such as a switched reluctance motor, an induction motor, an electronically rectified permanent magnet motor, or other suitable motor.

[0019] The compressor 32 compresses the refrigerant vapor and delivers the vapor through a discharge passage to the condenser 34. In some embodiments, the compressor 32 may be a centrifugal compressor. The compressor 32 includes a fluid (e.g., lubricating oil) that lubricates the components of the compressor. The refrigerant vapor carried to the condenser 34 by the compressor 32 can transfer heat to a cooling liquid (e.g., water or air) within the condenser 34. The refrigerant vapor can condense into a refrigerant liquid within the condenser 34 as a result of heat transfer with the cooling liquid. The refrigerant liquid from the condenser 34 can flow through the expander 36 to the evaporator 38. In the embodiment depicted in FIG. 3, the condenser 34 is cooled water and includes a tube bundle 54 connected to a cooling tower 56 that supplies the cooling liquid to the condenser.

[0020] The refrigerant liquid delivered to the vaporizer 38 can absorb heat from the same cooling liquid used in the condenser 34 or, alternatively, another cooling liquid. The refrigerant liquid in the vaporizer 38 can undergo a phase transition from the refrigerant liquid to the refrigerant vapor. As shown in the embodiment depicted in FIG. 3, the vaporizer 38 may include a tube bundle 58 having a supply line 60S and a return line 60R connected to the cooling load 62. The cooling liquid (e.g., water, ethylene glycol, calcium chloride brine, sodium chloride brine, or any other suitable fluid) of the vaporizer 38 flows into the vaporizer 38 via the return line 60R and exits the vaporizer 38 via the supply line 60S. The vaporizer 38 can lower the temperature of the cooling liquid within the tube bundle 58 via heat transfer with the refrigerant. The tube bundle 58 within the vaporizer 38 may include a plurality of tubes and / or a plurality of tube bundles. In either case, the refrigerant vapor exits the vaporizer 38 and returns to the compressor 32 via the suction line to complete the cycle.

[0021] Figure 4 is a schematic diagram of a vapor compression system 14 having an intermediate circuit 64 incorporated between a concentrator 34 and an expander 36. The intermediate circuit 64 may have an intake line 68 that is directly fluid-connected to the concentrator 34. In other embodiments, the intake line 68 may be indirectly fluid-connected to the concentrator 34. As shown in the embodiment depicted in Figure 4, the intake line 68 includes a first expander 66 located upstream of an intermediate container 70. In some embodiments, the intermediate container 70 may be a flash tank (e.g., a flash intercooler). In other embodiments, the intermediate container 70 may be configured as a heat exchanger or a "surface economizer". In the embodiment depicted in Figure 4, the intermediate container 70 is used as a flash tank, and the first expander 66 is configured to reduce the pressure (e.g., expand) of the refrigerant liquid received from the concentrator 34. During the expansion process, some of the liquid may vaporize, and therefore the intermediate container 70 may be used to separate the vapor from the liquid received from the first expander 66. Furthermore, in the intermediate container 70, further expansion of the refrigerant liquid may occur due to a pressure drop observed when the refrigerant liquid flows into the intermediate container 70 (for example, due to the rapid volume expansion observed when it flows into the intermediate container 70). The vapor in the intermediate container 70 may be drawn in by the compressor 32 through the suction line 74 of the compressor 32. In other embodiments, the vapor in the intermediate container may be drawn in at an intermediate stage of the compressor 32 (for example, not the suction stage). The liquid collected in the intermediate container 70 may have a lower enthalpy than the refrigerant liquid discharged from the concentrator 34 due to the expansion of the expander 66 and / or the intermediate container 70. The liquid from the intermediate container 70 can then flow through the second expander 36 through the line 72 to the vaporizer 38.

[0022] Figure 5 is a schematic diagram showing one embodiment of a lubrication circuit 80 that may be included in the vapor compression system 14. As described above, the vapor compression system 14 can utilize a fluid (e.g., a lubricant such as oil) that circulates within the compressor 32 to lubricate the components of the compressor 32 (e.g., bearings and / or shafts). More specifically, the lubrication circuit 80 is configured to circulate the fluid to various locations within the vapor compression system 14, such as the compressor 32, for the purpose of lubricating various components. The lubrication circuit 80 includes a storage tank 82 fluid-coupled to the compressor 32 for the recovery and / or storage of the fluid. After lubricating the components of the compressor 32, the fluid can flow to the storage tank 82 via the compressor discharge conduit 84 and accumulate in the storage tank 82. As shown in the figure, the lubrication circuit 80 includes a concentrator discharge conduit 86 and a vaporizer discharge conduit 88 configured to discharge the fluid, which is mixed with the refrigerant and collected in the concentrator 34 and vaporizer 38, respectively, to the storage tank 82. For example, the concentrator discharge conduit 86 and / or the vaporizer discharge conduit 88 may be configured to guide a fluid (e.g., oil or a mixture of oil and refrigerant) as a high-pressure gas to the storage tank 82. The fluid flowing through the concentrator discharge conduit 86 and / or the vaporizer discharge conduit 88 can flow through an eductor 89 before flowing into the storage tank 82. The eductor 89 can mix the fluids coming out of the concentrator 34 and the vaporizer 38 before they flow into the storage tank 82, and / or can draw in the fluids coming out of the concentrator 34 and the vaporizer 38 and heading towards the storage tank 82.

[0023] A pump 90 (e.g., a submersible pump and / or a variable-speed pump) may be located within the storage tank 82 to guide fluid or a mixture of fluid and refrigerant to the compressor 32 via the compressor supply conduit 92. In other embodiments, the pump 90 may be located outside the storage tank 82 and / or between the storage tank 82 and the compressor 32. Furthermore, in some embodiments, the lubrication circuit 80 may include a cooler located along the compressor discharge conduit 84 and / or the compressor supply conduit 92. The cooler may be configured to remove heat already absorbed by the fluid when lubricating the compressor 32.

[0024] In certain embodiments, the pump 90 may be a variable-speed electric pump configured to adjust so that the pump 90 provides or enables a specific flow rate of fluid. For example, the pump 90 may receive a signal from a controller indicating the adjustment of a target flow rate of fluid within the lubrication circuit 80. The speed of the pump 90 can be adjusted based on the received signal so that the fluid flowing through the pump 90 reaches the target flow rate. As described herein, the adjustment to the target flow rate may include proportional adjustment, linear adjustment, nonlinear adjustment, exponential adjustment, other types of flow rate adjustment, or a combination thereof. By comparison, a mechanically driven pump (e.g., a pump driven to adjust the flow rate via a shaft) may be configured to adjust the flow rate linearly rather than in any other way. Thus, the flow rate of fluid supplied by the pump 90 can be adjusted to a wider range of target flow rates compared to a mechanically driven pump.

[0025] In some embodiments, the pump 90 may be a fixed-speed pump, and the flow rate downstream of the pump 90 can be adjusted via an electronic regulator or electronic bypass valve. For example, the electronic regulator or electronic bypass valve may be located between the pump 90 and the compressor 32 (e.g., along the compressor supply conduit 92). The electronic regulator or electronic bypass valve can receive signals from the controller indicating the adjustment of the fluid flow rate in the lubrication circuit 80 to a target flow rate. In response, the operation of the electronic regulator or electronic bypass valve is adjusted so that the fluid flow through the pump 90 reaches the target flow rate.

[0026] Figure 6 is a schematic diagram showing one embodiment of the lubrication circuit 80. As shown in the embodiment depicted in Figure 6, the compressor 32 includes a shaft 94 configured to rotate and compress the refrigerant in the compressor 32 onto a rotor coupled to the shaft 94. The shaft 94 is at least partially supported by bearings 96. The illustrated embodiment shows a compressor 32 with one bearing 96, but in other embodiments the compressor 32 may include additional bearings 96 (e.g., two bearings, three bearings, four bearings, six bearings, ten bearings, etc.) configured to support the shaft 94. A fluid (e.g., oil or other lubricant) can flow between the shaft 94 and the bearings 96 so as a fluid film is formed between the shaft 94 and the bearings 96, lubricating the shaft 94 as it rotates. The fluid enters the compressor 32 through a compressor fluid inlet 98 coupled to a compressor supply conduit 92 and may be generally directed to a bearing fluid inlet 100 as indicated by arrow 102. The fluid flows from the bearing fluid inlet 100, between the shaft 94 and the bearing 96, and can finally exit the bearing 96 as indicated by arrow 104 (for example, at the end of the bearing 96). After passing through the bearing 96, the fluid can flow to the compressor fluid outlet 106, which is connected to the compressor discharge conduit 84. In this way, the fluid can be circulated from the storage tank 82, through the bearing 96, and back to the storage tank 82.

[0027] The vapor compression system 14 also includes a fluid pressure control system 110 configured to control the flow of fluid (e.g., lubricant) in the lubrication circuit 80. For example, parts of the lubrication circuit 80 and the vapor compression system 14 can be controlled by the fluid pressure control system 110 based on feedback indicating the operating parameters of the vapor compression system 14. In some embodiments, the vapor compression system 14 can be controlled based on feedback indicating the shaft speed (e.g., rotational shaft speed) of the shaft 94 detected by the sensor 112. The sensor 112 may be located close to the shaft 94 and is communicatively coupled to the control panel 40 so that the sensor 112 can output a signal indicating the speed of the shaft 94 to the control panel 40. Additionally or alternatively, the vapor compression system 14 can be controlled based on feedback indicating the temperature of the fluid in the bearing 96 within the compressor 32 detected by the sensor 114. The sensor 114 may be located close to the bearing 96 and is communicatively coupled to the control panel 40 so that the sensor 114 can output a signal indicating the temperature in the bearing 96 of the compressor 32 to the control panel 40. In some embodiments, the sensor 114 may be a thermocouple and / or other suitable device located close to the bearing 96 and configured to provide temperature feedback.

[0028] In certain embodiments, the fluid pressure control system 110 may be located along the compressor supply conduit 92 (for example, along the lubrication circuit 80 upstream of the bearing 96) and may include a sensor 116 configured to detect the fluid supply temperature of the fluid in the compressor supply conduit 92. Additionally or alternatively, the sensor 116 may be located at the compressor fluid inlet 98 and may be configured to detect the fluid supply temperature at the compressor fluid inlet 98. The sensor 116 is communicatively coupled to a control panel 40 and configured to output a signal indicating the fluid supply temperature to the control panel 40.

[0029] In certain embodiments, the fluid pressure control system 110 may include a sensor 118 positioned along the compressor discharge conduit 84 (e.g., downstream of the bearing 96 along the lubrication circuit 80) and configured to detect the fluid discharge temperature of the fluid in the compressor discharge conduit 84. Additionally or alternatively, the sensor 118 may be positioned at the compressor fluid outlet 106 and configured to detect the fluid discharge temperature at the compressor fluid outlet 106. The sensor 118 is communicatively coupled to the control panel 40 and configured to output a signal indicating the fluid discharge temperature to the control panel 40. Based on feedback indicating the fluid supply temperature and / or fluid discharge temperature, the microprocessor 44 of the control panel 40 can determine and / or calculate the temperature at the bearing 96 in the compressor 32 (e.g., using instructions stored in memory 46). For example, the microprocessor 44 can calculate the temperature at the bearing 96 in the compressor 32 based on the difference between the fluid supply temperature and the fluid discharge temperature, or based on other suitable algorithms using the fluid supply temperature and the fluid discharge temperature.

[0030] The microprocessor 44 can determine a target flow rate of fluid from the pump 90 to the bearing 96 based on the shaft speed of the shaft 94 and / or the temperature of the bearing 96 in the compressor. For example, the microprocessor 44 can determine the target flow rate of the fluid as a function of the shaft speed and / or temperature (e.g., a linear function, a nonlinear function, a proportional function, an exponential function, or a combination thereof). Additionally or alternatively, the microprocessor 44 can determine the target flow rate based on a reference table stored in memory 46. For example, the reference table may list the target flow rates as functions of the corresponding shaft speed and / or temperature. In some embodiments, the microprocessor 44 can determine the target flow rate by interpolating values ​​in the reference table. In further embodiments, the microprocessor 44 can determine the target flow rate based on inputs 130 to the interface board 48 (e.g., inputs generally representing the fluid characteristics, the operating mode of the compressor 32, and / or the operating mode of the vapor compression system 14).

[0031] After determining the target flow rate, the fluid pressure control system 110 can adjust the fluid flow rate to the target flow rate (for example, by adjusting the speed of the pump 90 to control the fluid pressure in the lubrication circuit 80). For example, the microprocessor 44 is communicatively coupled to the storage tank 82 and the pump 90 and sends a signal to the pump 90 indicating adjustments to control the fluid flow rate so that it reaches the target flow rate. It is possible to exert force. In certain embodiments, the microprocessor 44 can issue user-detectable notifications and / or alarms via an indicator 132 on an interface board 48 (e.g., a user interface). The indicator 132 may be any user-detectable notification, such as a light-emitting diode (LED), an audible alarm, a display, text, and / or other appropriate notification. For example, the user-detectable notification and / or alarm may indicate the fluid flow rate, target flow rate, the difference between the flow rate and the target flow rate, the temperature at the bearing 96 in the compressor 32, the fluid pressure in the lubrication circuit 80, or a combination thereof.

[0032] In certain embodiments, the fluid pressure control system 110 may include a sensor 120 configured to provide feedback to the control panel 40 indicating the flow rate of fluid in and / or out of the pump 90 (e.g., the speed of the pump 90 and / or the discharge pressure of the pump 90). As shown in the figure, the sensor 120 is coupled to the pump 90 and located inside the storage tank 82. In other embodiments, the sensor 120 may be located outside the storage tank 82 and may be configured to provide feedback indicating the flow rate of fluid out of the pump 90 before flowing into the compressor 32 (e.g., the flow rate in the compressor supply conduit 92 and / or at the compressor fluid inlet 98).

[0033] The microprocessor 44 can compare the flow rate (e.g., the flow rate detected by the sensor 120) with a target flow rate and control the pump 90 based on this comparison. For example, if the difference between the flow rate and the target flow rate exceeds a discrimination threshold, the microprocessor 44 can output a signal to the pump 90 that allows the flow rate to be adjusted to the target flow rate (e.g., by increasing or decreasing the speed of the pump 90). The discrimination threshold may be based on the type of fluid, the operating parameters of the fluid, the operating mode of the compressor 32 and / or the vapor compression system 14, the operator input, or a combination thereof. Additionally or alternatively, the discrimination threshold may be the percentage difference between the flow rate and the target flow rate (e.g., 1 percent, 2 percent, 5 percent, 10 percent, etc.).

[0034] As shown in the figure, the fluid pressure control system 110 includes a control panel 40 of the vapor compression system 14, which is configured to receive feedback indicating shaft speed and / or temperature, determine a target flow rate, and adjust the operation of the pump 90 to reach the target flow rate. Additionally or alternatively, the fluid pressure control system 110 may include an additional controller configured to receive feedback indicating shaft speed and / or temperature, determine a target flow rate, and adjust the operation of the pump 90 to reach the target flow rate. For example, the additional controller may be a controller of the lubrication circuit 80 and may be configured to control the flow of fluid within the lubrication circuit 80.

[0035] In some embodiments, the memory 46 of the control panel 40 may include one or more tangible, non-temporary, computer-readable media for storing instructions executable by the microprocessor 44 and / or data processed by the microprocessor 44. For example, the memory 46 may include random access memory (RAM), read-only memory (ROM), rewritable non-volatile memory such as flash memory, a hard drive, an optical disc, other types of memory, or a combination thereof. The microprocessor 44 may include one or more general-purpose microprocessors, one or more application-specific integrated circuits (ASICs), one or more field-programmable logic arrays (FPGAs), or any combination thereof for executing instructions stored in the memory 46.

[0036] Figure 7 is a flowchart showing one embodiment of the process 140 that operates the fluid pressure control system 110. It should be understood that the steps discussed herein are illustrative only, and certain steps may be omitted or performed in a different order than described later. In some embodiments, the process 140 is stored in memory 46 and accessed by the microprocessor 4 of the control panel 40. It may be executed by 4, or it may be stored in other suitable memory and executed by other suitable processing circuits of the fluid pressure control system 110.

[0037] As shown in the embodiment depicted in Figure 7, in block 142, the fluid pressure control system 110 receives feedback indicating operating parameters from sensors (e.g., sensors 112, 114, 116, 118, and / or 120) located along the lubrication circuit 80 via the microprocessor 44. The operating parameters may include the speed of the shaft 94, the temperature of the bearing 96 in the compressor 32, the fluid supply temperature in the compressor supply conduit 92, the fluid discharge temperature in the compressor discharge conduit 84, the fluid flow rate in the pump 90, other operating parameters associated with the operation of the vapor compression system 14 (e.g., refrigerant operating parameters), or a combination thereof. As described above, the microprocessor 44 may be configured to determine the temperature of the bearing 96 in the compressor 32 based on the fluid supply temperature and / or fluid discharge temperature.

[0038] In block 144, the fluid pressure control system 110 adjusts the fluid flow rate in the lubrication circuit 80 based on feedback indicating operating parameters. For example, the microprocessor 44 can determine a target fluid flow rate based on feedback (e.g., feedback indicating the speed of the shaft 94, the temperature of the bearing 96 in the compressor 32, the fluid supply temperature flowing through the compressor supply conduit 92, the fluid discharge temperature flowing through the compressor discharge conduit 84, the fluid flow rate in the pump 90, other operating parameters associated with the operation of the vapor compression system 14, or any combination thereof) and output a signal to the pump 90 that allows adjustments to be made so that the fluid flow rate reaches the target flow rate (e.g., an output of a signal to adjust the speed of the pump 90). In certain embodiments, the microprocessor 44 can compare the measured or detected flow rate with a target flow rate and, in response to the difference between the flow rate and the target flow rate exceeding a discrimination threshold, output a signal to the pump 90 that allows adjustments to the fluid flow rate.

[0039] In some embodiments, the fluid pressure control system 110 can adjust the fluid flow rate in the lubrication circuit 80 based on the speed of the shaft 94 and the temperature of the bearing 96 in the compressor 32. For example, the microprocessor 44 can determine a target flow rate based on a target temperature range for the bearing 96 in the compressor 32. Feedback indicating the actual temperature of the bearing 96 in the compressor 32 may be received from sensors 114, 116, and / or 118, determined based on feedback from sensors 114, 116, and / or 118, and / or received via input 130. If the actual temperature of the bearing 96 in the compressor 32 is outside the target temperature range, the microprocessor 44 can output a signal to the pump 90 to perform an adjustment to the fluid flow rate. In some embodiments, the memory 46 can store a range of operating parameters (e.g., speed range) that enable the pump 90 to operate effectively. If the microprocessor 44 determines that the target fluid flow rate may cause the pump 90 to operate outside the range of its operating parameters, the microprocessor 44 can instruct the pump 90 to operate at the upper or lower limit of the operating parameter range.

[0040] Similarly, the microprocessor 44 can determine a target fluid flow rate based on the speed of the shaft 94. For example, the microprocessor 44 can determine the target flow rate as a function of the shaft speed (e.g., a linear function, a proportional function, or an exponential function). In certain embodiments, the microprocessor 44 can compare the measured flow rate with the target flow rate and, in response to the difference between the measured flow rate and the target flow rate exceeding a discrimination threshold, output a signal to the pump 90 to adjust the fluid flow rate.

[0041] In a particular embodiment, if the target fluid flow rate causes the pump 90 to operate outside the range of its operating parameters, the microprocessor receives signals from sensors 114, 116, and / or 118. A feedback check can be performed to determine whether sensors 114, 116, and / or 118 are operating correctly, and whether the pump 90, compressor 32, or vapor compression system 14 should be stopped, or whether other control measures should be taken. For example, if the feedback from sensor 114 (e.g., feedback indicating the fluid temperature in bearing 96 in compressor 32) corresponds to a first target flow rate that is outside the range of the operating parameters, the microprocessor 44 can determine whether the feedback from a second sensor (e.g., sensor 116 or 118) corresponds to a second target flow rate that is also outside the range of the operating parameters. If both the first and second target flow rates cause pump 90 to operate outside the range of the operating parameters, the microprocessor 44 can output a control signal to stop the pump 90, compressor 32, and / or vapor compression system 14, or to perform another control action. If only one of the first or second target flow rates causes the pump 90 to operate outside the range of its operating parameters, the microprocessor 44 may output a signal to the control panel 40 indicating the status / condition of sensors 114, 116, and / or 118 (for example, the possibility that sensors 114, 116, and / or 118 are not functioning properly).

[0042] Figure 8 is a flowchart showing one embodiment of a process 150 that operates the fluid pressure control system 110. It should be understood that the steps discussed herein are illustrative only, and certain steps may be omitted or performed in a different order than those described later. In some embodiments, the process 150 may be stored in memory 46 and executed by the microprocessor 44 of the control panel 40, or it may be stored in other suitable memory and executed by other suitable processing circuitry.

[0043] As shown in the embodiment depicted in Figure 8, in block 152, the fluid pressure control system 110 receives inputs(s) via the microprocessor 44 that indicate fluid characteristics (e.g., operating characteristics of the fluid in the lubrication circuit 80, the type of fluid, operating characteristics of other fluids in the vapor compression system 14). For example, the inputs may include input 130 provided to the interface board 48.

[0044] In block 154, the microprocessor 44 receives feedback from sensor 112 indicating the speed of shaft 94. In block 156, the microprocessor 44 determines the target fluid flow rate to bearing 96 based on the speed of shaft 94. For example, the microprocessor 44 can determine the target fluid flow rate as a function of the speed of shaft 94 (e.g., a linear function, a nonlinear function, a proportional function, an exponential function, or a combination thereof), and / or determine the target flow rate based on the speed of shaft 94 by referring to a reference table.

[0045] In block 158, the fluid pressure control system 110 adjusts the fluid flow rate by adjusting the operation of the pump 90 (e.g., the speed of the pump 90 and / or the position / angle of the swashplate of the pump 90) to achieve a target flow rate. For example, the fluid pressure control system 110 can determine a target speed for the pump 90 to reach a target flow rate, compare the target speed with a range of operating speeds for the pump 90, select an operating speed for the pump 90 from the range of operating speeds based on the target speed, and adjust the operation of the pump 90 to the selected operating speed. In certain embodiments, the microprocessor 44 can compare the measured flow rate with a target flow rate and, in response to the difference between the measured flow rate and the target flow rate exceeding a discrimination threshold, output a signal to the pump 90 that enables adjustment of the fluid flow rate.

[0046] Figure 9 is a flowchart showing one embodiment of a process 160 that operates the fluid pressure control system 110. It should be understood that the steps discussed herein are illustrative only, and certain steps may be omitted or performed in a different order than described later. In some embodiments, the process 160 is stored in memory 46 and transmitted to the microprocessor 44 of the control panel 40. It may be executed by other appropriate memory or stored and executed by other appropriate processing circuitry.

[0047] As shown in the embodiment depicted in Figure 9, in block 162, the fluid pressure control system 110 receives inputs(s) via the microprocessor 44 that indicate fluid characteristics (e.g., operating characteristics of the fluid in the lubrication circuit 80, the type of fluid, operating characteristics of other fluids in the vapor compression system 14). In some embodiments, the feedback may include inputs 130 provided, for example, by the user to the interface board 48.

[0048] In block 164, the microprocessor 44 receives feedback from sensor 114 which may include feedback indicating the temperature of the fluid in the bearing 96 in the compressor 32. Additionally or alternatively, the microprocessor 44 may receive the fluid supply temperature from sensor 118 and / or the fluid discharge temperature from sensor 116 and determine the temperature of the fluid in the bearing 96 in the compressor 32 based on the fluid supply temperature and / or fluid discharge temperature.

[0049] In block 166, the microprocessor 44 determines a target flow rate of fluid from the pump 90 to the bearing 96 based on the temperature of the bearing 96 in the compressor 32. For example, the microprocessor 44 can determine the target flow rate of fluid as a function of the temperature of the bearing 96 (e.g., a linear function, a nonlinear function, a proportional function, an exponential function, or a combination thereof), and / or determine the target flow rate based on the temperature of the bearing 96 by referring to a reference table.

[0050] In block 168, the fluid pressure control system 110 controls the fluid flow rate by adjusting the operation of the pump 90 to achieve a target flow rate. For example, the fluid pressure control system 110 can determine a target speed for the pump 90 to reach a target flow rate, compare the target speed with a range of operating speeds for the pump 90, select an operating speed for the pump 90 from the range of operating speeds based on the target speed, and adjust the operation of the pump 90 to the selected operating speed. In certain embodiments, the microprocessor 44 can compare the measured flow rate with a target flow rate and, in response to the difference between the measured flow rate and the target flow rate exceeding a discrimination threshold, output a signal to the pump 90 that enables adjustment of the fluid flow rate.

[0051] Although processes 140, 150, and 160 are described herein as separate processes, processes 140, 150, and 160, or specific steps thereof, can be combined into a single process or method. For example, the fluid pressure control system 110 can perform the steps of processes 140, 150, and 160 simultaneously or individually. In a particular embodiment, as described above, the fluid pressure control system 110 can control the flow rate of the fluid in the lubrication circuit 80 as a function of the speed of the shaft 94 and the temperature of the fluid in the bearing 96 in the compressor 32.

[0052] Accordingly, this disclosure aims at a fluid pressure control system for lubricating various components of a compressor. The fluid pressure control system includes sensors that provide feedback indicating the speed of the compressor shaft and / or the temperature of the bearings within the compressor. For example, a first sensor may be positioned close to the shaft and configured to provide feedback indicating the shaft speed. A second sensor may be positioned close to the bearing and configured to provide feedback indicating the temperature of the bearing within the compressor. In certain embodiments, the sensors may be positioned in the compressor supply conduit and / or the compressor discharge conduit of the compressor and may be configured to detect the fluid supply temperature and fluid discharge temperature, respectively. Thus, the controller of the fluid pressure control system determines the temperature of the bearings within the compressor based on the fluid supply temperature and / or fluid discharge temperature. It is possible.

[0053] Furthermore, the controller can adjust the pump's operating parameters to control the flow rate of fluid from the pump to the bearings based on the shaft speed and / or the temperature of the bearings in the compressor. For example, the controller can determine a target flow rate based on the shaft speed and / or the temperature of the bearings and adjust the pump to reach the target flow. In some embodiments, the target flow rate may be a function of the shaft speed and / or the temperature of the bearings (e.g., a linear function, a nonlinear function, a proportional function, an exponential function, or a combination thereof). As the shaft speed and / or the temperature of the bearings decreases, the controller can adjust the pump's operation overall to decrease the flow rate. As the shaft speed and / or the temperature of the bearings increases, the controller can adjust the pump's operation overall to increase the flow rate. In either case, the controller can improve the overall operation and efficiency of the compressor and / or the vapor compression system by adjusting the pump's operation to control the fluid flow rate. For example, flow rate control can at least partially block or reduce fluid leakage from the compressor seals and / or reduce friction between the fluid, shaft, and / or bearings.

[0054] While only specific features and embodiments of the present invention have been illustrated and described, those skilled in the art will likely conceive of numerous improvements and modifications (e.g., the size, dimensions, structure, shape and proportions of various elements, the values ​​of parameters (e.g., temperature, pressure, etc.), mounting settings, material use, color, orientation, etc.) without substantially departing from the novel teachings and merits of the subject matter described in the claims. Any order or sequence of processing or method steps can be modified or replaced according to alternative embodiments. Accordingly, the appended claims are intended to encompass such improvements and modifications as being within the true spirit of the invention. Furthermore, through efforts to concisely describe these exemplary embodiments, not all features of actual implementations (i.e., those unrelated to what is currently considered the best mode for carrying out the invention, or unrelated to enabling the invention described in the claims) are described herein. It is important to understand that in developing such actual implementations, as in engineering or design projects, numerous implementation-specific decisions must be made. While such development efforts may be complex and time-consuming, those skilled in the art who benefit from this disclosure should recognize that it is a routine process of design, manufacturing, and production without excessive experimentation. [Aspect 1] A fluid pressure control system for a compressor, A pump configured to guide lubricant toward the bearings of the compressor, A sensor configured to provide feedback indicating the speed of the shaft of the compressor, which is configured to be at least partially supported by the bearing, If executed by a processor, the processor will The sensor receives a signal indicating the speed of the shaft. A system including a non-temporary computer-readable medium containing executable instructions configured to adjust the operation of the pump based on the aforementioned signals. [Aspect 2] If the aforementioned executable instruction is executed by the processor, then the processor will: Based on the speed of the shaft, the target flow rate of the lubricant is determined. A fluid pressure control system according to embodiment 1, configured to adjust the operation of the pump so that the flow rate of the lubricant directed toward the bearing of the compressor approaches the target flow rate. [Aspect 3] The fluid pressure control system according to embodiment 2, wherein, if the executable instruction is executed by the processor, the processor is configured to determine a target flow rate of the lubricant based on the speed of the shaft using a proportional function. [Aspect 4] The fluid pressure control system according to embodiment 2, wherein, if the executable instruction is executed by the processor, the processor is configured to determine a target flow rate of the lubricant based on the speed of the shaft using an exponential function. [Aspect 5] The fluid pressure control system according to embodiment 1, wherein the sensor is located close to the end of the shaft. [Aspect 6] The fluid pressure control system according to embodiment 1, comprising the bearing, wherein the lubricant is configured to form a film between the bearing and the shaft. [Aspect 7] The fluid pressure control system according to embodiment 1, wherein the pump includes an electric pump. [Aspect 8] If the aforementioned executable instruction is executed by the processor, then the processor will: The fluid pressure control system according to embodiment 7, configured to output a signal to the electric pump to adjust the flow rate of the lubricant to reach a target flow rate. [Aspect 9] A fluid pressure control system for a compressor, A pump configured to guide lubricant toward the bearings of the compressor, A sensor configured to provide feedback indicating the temperature of the bearing in the compressor, If executed by a processor, the processor will The sensor receives a signal indicating the temperature of the bearing in the compressor. A system including at least one non-temporary computer-readable medium containing an executable instruction configured to adjust the speed of the pump based on the aforementioned signal. [Aspect 10] A fluid pressure control system according to embodiment 9, comprising a lubrication circuit, wherein the pump and the compressor are arranged within the lubrication circuit, and the lubrication circuit is configured to guide the lubricant from the pump to the bearing and from the bearing to the pump. [Aspect 11] The sensor is positioned within the lubrication circuit and configured to output a first signal indicating the fluid supply temperature of the lubricant in the lubrication circuit upstream of the bearing, The fluid pressure control system according to embodiment 10, further comprising a second sensor disposed within the lubrication circuit and configured to output a second signal indicating the fluid discharge temperature of the lubricant in the lubrication circuit downstream of the bearing. [Aspect 12] If the aforementioned executable instruction is executed by the processor, then the processor will: A fluid pressure control system according to embodiment 11, configured to determine the temperature of the bearing in the compressor based on the fluid supply temperature and the fluid discharge temperature. [Aspect 13] If the aforementioned executable instruction is executed by the processor, then the processor will: The fluid pressure control system according to embodiment 9, configured to output a signal to an interface board and display the temperature of the bearing in the compressor on the display of the interface board. [Aspect 14] The fluid pressure control system according to embodiment 9, wherein the sensor is positioned in close proximity to the bearing. [Aspect 15] The fluid pressure control system according to embodiment 14, wherein the sensor includes a thermocouple configured to output a signal indicating the temperature of the bearing in the compressor. [Aspect 16] A fluid pressure control system for a compressor, A pump configured to guide lubricant toward the bearings of the compressor, A first sensor configured to provide feedback indicating the speed of the compressor shaft, which is configured to be at least partially supported by the bearing, A second sensor configured to provide feedback indicating the temperature of the bearing in the compressor, If executed by a processor, the processor will A first signal representing the speed of the shaft is received from the first sensor. A second signal indicating the temperature of the bearing in the compressor. The second sensor receives the signal, Includes an executable command configured to adjust the speed of the pump based on the first signal, the second signal, or both. A system including at least one non-temporary computer-readable medium. [Aspect 17] If the aforementioned executable instruction is executed by the processor, then the processor will: The fluid pressure control system according to embodiment 16, configured to determine a target flow rate of fluid directed to the bearing of the compressor by the pump. [Aspect 18] If the aforementioned executable instruction is executed by the processor, then the processor will: Determine the target speed of the pump to reach the target flow rate. A fluid pressure control system according to embodiment 17, configured to compare the target speed of the pump that reaches the target flow rate with the operating range of the pump's speed. [Aspect 19] If the aforementioned executable instruction is executed by the processor, then the processor will: The target flow rate of the lubricant is determined based on the fact that the temperature of the bearing in the compressor exceeds the target temperature range. A fluid pressure control system according to embodiment 17, configured to adjust the operation of the pump to bring the flow rate of the lubricant closer to the target flow rate. [Aspect 20] If the aforementioned executable instruction is executed by the processor, then the processor will: A fluid pressure control system according to embodiment 19, configured to determine the target temperature range based on inputs received via an interface board.

Claims

1. A heating, ventilation, air conditioning, and / or refrigeration (HVAC&R) system, A compressor configured to compress the refrigerant, A concentrator configured to arrange the refrigerant in a heat exchange relationship with the cooling liquid, A pump configured to guide lubricant toward the bearings of the compressor, A first sensor configured to provide feedback indicating the speed of the compressor shaft, which is configured to be at least partially supported by the bearing, A second sensor configured to provide feedback indicating the temperature of the bearing in the compressor, If executed by a processor, the processor will A first signal indicating the speed of the shaft is received from the first sensor. A second signal indicating the temperature of the bearing in the compressor is received from the second sensor. The system receives an input indicating the type of lubricant related to the aforementioned lubricant. The target speed of the pump is determined based on the first signal, the second signal, the type of lubricant, and the operating range of the pump's speed. An HVAC&R system including a non-temporary computer-readable medium containing executable instructions configured to adjust the operation of the pump based on the target speed of the pump.

2. If the aforementioned executable instruction is executed by the processor, then the processor will: Based on the speed of the shaft, the target flow rate of the lubricant is determined. The HVAC&R system according to claim 1, configured to adjust the operation of the pump so that the flow rate of the lubricant directed toward the bearing of the compressor approaches the target flow rate.

3. The HVAC&R system according to claim 2, wherein, if the executable instruction is executed by the processor, the processor is configured to determine a target flow rate of the lubricant based on the speed of the shaft using a proportional function.

4. The HVAC&R system according to claim 2, wherein, if the executable instruction is executed by the processor, the processor is configured to determine a target flow rate of the lubricant based on the speed of the shaft using an exponential function.

5. The HVAC&R system according to claim 1, wherein the first sensor is positioned close to the end of the shaft.

6. The HVAC&R system according to claim 1, comprising the bearing, wherein the lubricant is configured to form a film between the bearing and the shaft.

7. The HVAC&R system according to claim 1, wherein the pump includes an electric pump.

8. If the aforementioned executable instruction is executed by the processor, then the processor will: The HVAC&R system according to claim 7, further configured to output an additional signal to the electric pump to adjust the flow rate of the lubricant to reach a target flow rate.

9. A fluid pressure control system for a compressor, A pump configured to guide lubricant toward the bearings of the compressor, A lubrication circuit configured to guide the lubricant from the pump toward the bearing and from the bearing toward the pump, A first sensor configured to output a first signal indicating the fluid supply temperature of the lubricant in the lubrication circuit, located upstream of the bearing, A second sensor configured to output a second signal indicating the fluid discharge temperature of the lubricant in the lubrication circuit, downstream of the bearing, A third sensor configured to provide feedback indicating the speed of the compressor shaft, which is configured to be at least partially supported by the bearing, If executed by a processor, the processor will The system receives an input indicating the type of lubricant related to the aforementioned lubricant. The first signal indicating the fluid supply temperature is received from the first sensor. The second signal indicating the fluid discharge temperature is received from the second sensor. A third signal indicating the speed of the shaft is received from the third sensor. Based on the fluid supply temperature and the fluid discharge temperature, the temperature of the bearing inside the compressor is determined. It is determined that the temperature of the bearing in the compressor exceeds the target temperature range. Includes an executable command configured to adjust the pump speed based on the type of lubricant and the third signal in response to a temperature exceeding the target temperature range, A fluid pressure control system comprising at least one non-temporary computer-readable medium.

10. If the aforementioned executable instruction is executed by the processor, then the processor will: The fluid pressure control system according to claim 9, configured to output a signal to an interface board and display the temperature of the bearing in the compressor on the display of the interface board.

11. The fluid pressure control system according to claim 9, wherein the first sensor is positioned in close proximity to the bearing.

12. The fluid pressure control system according to claim 11, wherein the first sensor includes a thermocouple.

13. A fluid pressure control system for a compressor, A storage tank configured to receive the flow of lubricant from a vaporizer, a concentrator, or both, A pump configured to guide the lubricant from the storage tank toward the bearings of the compressor, A first sensor configured to provide feedback indicating the speed of the compressor shaft, which is configured to be at least partially supported by the bearing, A second sensor configured to provide feedback indicating the temperature of the bearing in the compressor, If executed by a processor, the processor will A first signal representing the speed of the shaft is received from the first sensor. A second signal indicating the temperature of the bearing in the compressor is received from the second sensor. The system receives an input indicating the type of lubricant related to the aforementioned lubricant. The system includes the first signal, the second signal, and an executable command configured to adjust the speed of the pump based on the type of lubricant, A fluid pressure control system comprising at least one non-temporary computer-readable medium.

14. If the aforementioned executable instruction is executed by the processor, then the processor will: The fluid pressure control system according to claim 13, configured to determine a target flow rate of lubricant directed to the bearings of the compressor by the pump.

15. If the aforementioned executable instruction is executed by the processor, then the processor will: Determine the target speed of the pump to reach the target flow rate. The fluid pressure control system according to claim 14, configured to compare the target speed of the pump that reaches the target flow rate with the operating range of the pump's speed.

16. If the aforementioned executable instruction is executed by the processor, then the processor will: The target flow rate of the lubricant is determined based on the fact that the temperature of the bearing in the compressor exceeds the target temperature range. The fluid pressure control system according to claim 14, configured to adjust the operation of the pump to bring the flow rate of the lubricant closer to the target flow rate.

17. If the aforementioned executable instruction is executed by the processor, then the processor will: The fluid pressure control system according to claim 16, configured to determine the target temperature range based on inputs received via an interface board.

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