CN117267260A - Air bearing, compressor, refrigeration equipment and control method - Google Patents

Air bearing, compressor, refrigeration equipment and control method Download PDF

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Publication number
CN117267260A
CN117267260A CN202311275054.4A CN202311275054A CN117267260A CN 117267260 A CN117267260 A CN 117267260A CN 202311275054 A CN202311275054 A CN 202311275054A CN 117267260 A CN117267260 A CN 117267260A
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CN
China
Prior art keywords
air
temperature
bearing
pressure
air inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311275054.4A
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Chinese (zh)
Inventor
华超
周宇
周堂
曹理恒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202311275054.4A priority Critical patent/CN117267260A/en
Publication of CN117267260A publication Critical patent/CN117267260A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0662—Details of hydrostatic bearings independent of fluid supply or direction of load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/057—Bearings hydrostatic; hydrodynamic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
    • F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/005—Fluid passages not relating to lubrication or cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/204—Temperature of the air before heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/242—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1863—Arrangement or mounting of electric heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
    • F24H9/2071—Arrangement or mounting of control or safety devices for air heaters using electrical energy supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/005—Compression machines, plants or systems with non-reversible cycle of the single unit type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2233/00—Monitoring condition, e.g. temperature, load, vibration

Abstract

The invention discloses an air bearing, a compressor, refrigeration equipment and a control method, wherein the air bearing comprises an air inlet for providing air for the bearing, the air inlet is provided with a temperature sensor for detecting the temperature of air inlet and a temperature controller for controlling the temperature of air inlet, and the temperature controller controls the temperature of air inlet according to the detection data of the temperature sensor so as to enable the air inlet to be completely vaporized. According to the temperature controller, the temperature of the inlet air is controlled according to the detection data of the temperature sensor, so that the inlet air is completely vaporized, other small liquid beads entering the bearing are not contained, and knocking caused by liquid vaporization in the bearing cavity is avoided. The temperature controller is an electric heating device, and the temperature of the air inlet is increased in a heating mode, so that the air inlet is completely vaporized.

Description

Air bearing, compressor, refrigeration equipment and control method
Technical Field
The invention relates to the technical field of bearings, in particular to an air bearing, a compressor, refrigeration equipment and a control method.
Background
The air bearing is called as an air suspension bearing, and the air (usually compressed air) is used for supporting the rotating component so as to reduce friction and abrasion, improve the precision of the rotating component and prolong the service life of the rotating component. The working principle of the air bearing is based on the air cushion effect of the gas, wherein the gas is injected into the bearing housing, forming a gas film, suspending the rotating parts (e.g. the shaft) above the gas. Such a gas film can effectively reduce friction and wear, thereby reducing energy loss and heat generation.
The best operating condition of the air suspension bearing in the air suspension compressor of the refrigeration equipment is that all refrigerant gas is adopted for air supply suspension, but the existing air supply device cannot effectively separate air-liquid refrigerant, often contains more refrigerant liquid beads in air supply of the suspension bearing, when the refrigerant liquid beads enter a bearing cavity because the temperature of the bearing cavity is higher, the refrigerant liquid beads reach the phase change point of the refrigerant, the refrigerant liquid beads are gasified into gaseous refrigerant, the gasification of the liquid beads is carried out one by one (like firecracker discharging effect, local air pressure explosion vibration is caused), the air pressure in the bearing cavity is unstable due to a plurality of local air pressure explosion vibration, and the unstable accuracy of the vibration operation of the bearing is further caused, so that the service life of the bearing is shortened, and interference abrasion damage of parts such as a shaft and comb teeth is possibly caused due to the unstable operation of the shaft.
Disclosure of Invention
In order to solve the problem that liquid beads are contained in air inlet of the air bearing, the invention provides that other air inlets are completely vaporized by controlling the temperature before the air inlet of the air bearing, and small liquid beads are not contained, so that knocking caused by liquid vaporization in a bearing cavity is avoided.
The invention adopts the technical scheme that the air bearing is designed and comprises an air inlet for providing air for the bearing, wherein the air inlet is provided with a temperature sensor for detecting the temperature of air inlet and a temperature controller for controlling the temperature of air inlet, and the temperature controller controls the temperature of air inlet according to the detection data of the temperature sensor so as to ensure that the air inlet is completely vaporized.
In certain embodiments, the temperature controller is an electrical heating device.
In some embodiments, the electric heating device comprises a heating chamber in communication with the air inlet, the heating chamber having an electric heating device disposed therein.
In certain embodiments, the temperature sensor is disposed on a cavity wall of the heating cavity.
In some embodiments, the engine further comprises a pressure sensor for detecting the pressure of the intake air, and the temperature controller controls the temperature of the intake air according to the temperature sensor and the detection data of the pressure sensor.
In some embodiments, the air pump is further connected to the air inlet, the heating chamber is connected between the air pump and the air inlet, and the air pump controls the air inlet pressure according to the detection data of the pressure sensor.
The compressor comprises the air bearing.
The refrigerating equipment comprises the compressor, the air bearing is communicated with a pipeline of the refrigerating equipment, and the suspension gas of the air bearing is the refrigerant gas of the refrigerating equipment.
In certain embodiments, the air bearing communicates between a condenser and an evaporator of the refrigeration appliance.
The control method is used for the air bearing, the air inlet pressure and the temperature of the air bearing are obtained, whether the temperature of the air is larger than the vaporization temperature under the current pressure or not is determined according to the pressure-temperature vaporization curve of the air inlet, and if not, the temperature controller works to enable the air temperature to rise to be higher than the vaporization temperature; if so, no action is taken.
Compared with the prior art, the invention has the following beneficial effects:
according to the temperature controller, the temperature of the inlet air is controlled according to the detection data of the temperature sensor, so that the inlet air is completely vaporized, other small liquid beads entering the bearing are not contained, and knocking caused by liquid vaporization in the bearing cavity is avoided. The temperature controller is an electric heating device, and the temperature of the air inlet is increased in a heating mode, so that the air inlet is completely vaporized.
Drawings
The present invention will now be described in detail with reference to specific embodiments and drawings, which are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. The drawings illustrate generally, by way of example and not limitation, embodiments discussed herein. Wherein:
fig. 1 is a schematic view of a prior art compressor with an air bearing.
Fig. 2 is a schematic diagram of an eccentric trajectory of a shaft of a conventional compressor having an air bearing.
Fig. 3 is a schematic view of a compressor with an air bearing of the present embodiment.
Fig. 4 is a schematic diagram of a control system for air supply of the air bearing of the present embodiment.
Fig. 5 is a schematic diagram of the pressure-temperature vaporization curve of the refrigerant of the present embodiment.
Fig. 6 is a schematic diagram of the eccentric locus of the shaft of the compressor with an air bearing of the present embodiment.
In the figure, 1, an impeller; 2. an air suction port of the compressor; 3. a compressor housing; 4. a compressor discharge port; 5. a motor stator; 6. a motor rotor; 7. a bearing; 8. a bearing air inlet pipe; 9. a bearing air outlet pipe; 10. a heating chamber; 11. an air pump; 12. a controller; 13. a temperature sensor; 14. a pressure sensor; 15. an electric heating device.
Detailed Description
The following are specific examples of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these examples, and the following embodiments do not limit the inventions according to the claims. Furthermore, all combinations of features described in the embodiments are not necessarily essential to the inventive solution.
The principles and structures of the present invention are described in detail below with reference to the drawings and the examples.
Example 1
An air bearing is a type of bearing commonly found in engineering applications, and unlike conventional grease or ball bearings, utilizes gas (typically compressed air) to support rotating components to reduce friction and wear, improve the accuracy and life of the rotating components. Air bearing is commonly used in applications requiring high precision and low vibration, such as high-speed rotating equipment, precision machine tools, semiconductor manufacturing equipment, and the like.
The working principle of the air bearing is based on the air cushion effect of the gas, wherein the gas is injected into the bearing housing, forming a gas film, suspending the rotating parts (e.g. the shaft) above the gas. Such a gas film can effectively reduce friction and wear, thereby reducing energy loss and heat generation. In addition, the air bearing can also provide non-contact support, so that direct contact between the bearing and the shaft is reduced, and high-speed rotation is more stable. The air bearing can provide very high precision of the rotating component, and is suitable for applications requiring extremely high precision. Since there is no actual physical contact between the bearing and the shaft, the friction loss is low and the energy efficiency is high. The air bearing can reduce vibration and noise, and is particularly important for equipment needing stable running. Air bearing typically has a long service life due to low friction and wear. However, air bearings also have some limitations, including reliance on gas supply systems, higher manufacturing and maintenance costs, and some requirements on the working environment, such as clean gas.
A refrigeration system compressor is a key component in a refrigeration cycle for sucking a refrigerant gas of low pressure and low temperature and then converting it into a gas of high pressure and high temperature by compression, thereby increasing the temperature and pressure of the gas to achieve a heat exchange process in the refrigeration cycle. This principle of operation allows the refrigeration system to absorb heat and discharge it to the external environment, thereby allowing the refrigeration or air conditioning system to maintain the desired low temperature environment. Refrigeration system compressors typically employ reciprocating or screw compressors. During operation, refrigerant gas is drawn from the evaporator and then compressed into high pressure, high temperature gas by the compressor. This high temperature, high pressure gas flows to the condenser, releasing heat to the surrounding environment by heat dissipation, causing the refrigerant to cool and condense into a liquid. The liquid refrigerant is then amplified by the expansion valve to become a low pressure, low temperature gas, which reenters the evaporator, completing the refrigeration cycle. Refrigerating system compressors are widely used in domestic refrigerators, commercial refrigeration equipment, air conditioning systems, freezers, industrial cooling systems, and various refrigeration applications. Different application areas may require different types and sizes of compressors. There are many different types of refrigerant system compressors including reciprocating, screw, centrifugal, etc. The selection of the appropriate type depends on the capacity, efficiency and application requirements of the refrigeration system. Energy efficiency is critical to refrigeration system compressors, particularly in commercial and industrial applications where energy costs are a significant proportion. Accordingly, refrigerant system compressor manufacturers are continually striving to increase the efficiency of the compressor to reduce energy consumption. Maintenance of the refrigeration system compressor is important to ensure long-term reliable operation thereof. Periodic inspection and maintenance, including cleaning, lubrication, and inspection of components such as condensers, evaporators, etc., can extend the life and performance of the compressor. Refrigeration system compressors are the core components of the refrigeration cycle, which enable the refrigeration system to maintain a desired temperature, which is critical to maintaining food fresh, providing a comfortable indoor environment, and many industrial processes. The selection of an appropriate refrigeration system compressor and a reasonable maintenance schedule is critical to ensure efficient operation of the system.
The best state of the air suspension bearing in the air suspension compressor is to fully adopt refrigerant gas for air supply suspension, but the existing air supply device cannot effectively separate air and liquid refrigerants, often the air supply of the air suspension bearing contains more small refrigerant liquid beads, under normal conditions, if the air suspension bearing is fully suspended by the gaseous refrigerants, the suspension pressure of each place can be well kept consistent, the running stability and the precision of the bearing are high, and the phenomenon of axial vibration cannot occur; but at present, because the air supply is impure, more refrigerant liquid beads are mixed in the air supply, when the refrigerant liquid beads enter the bearing cavity, the refrigerant liquid beads can be gasified into a gaseous refrigerant because the temperature of the bearing cavity is higher, the gasification of the refrigerant liquid beads is carried out one by one (like firecracker discharging effect, local air pressure explosion vibration is caused), the air pressure in the bearing cavity is unstable, the unstable precision of the vibration operation of the bearing is further caused, so that the service life of the bearing is shortened, and the interference abrasion damage of parts such as shafts and comb teeth is possibly caused because of the unstable operation of the shafts.
As shown in fig. 1, in the prior air supply scheme, high-pressure air in a condenser is extracted by an air pump 11, and is directly supplied to an air suspension bearing 7 to suspend a rotor shaft by means of air pressure of the air, and the air returns to a low-pressure cavity of an evaporator along a pipeline after the shaft is suspended. The air pump 11 directly extracts the high-pressure gas of the refrigerant in the condenser, and the extracted high-pressure gas of the refrigerant inevitably contains many liquid-gas refrigerant, and many small liquid beads of the refrigerant are mixed in the high-pressure gas, when the small liquid beads of the refrigerant enter the cavity of the bearing 7, because the temperature of the cavity of the bearing 7 is higher, the small liquid beads of the refrigerant reach the phase change point of the refrigerant, the small liquid beads of the refrigerant are gasified into the gaseous refrigerant, the gasification of the small liquid beads one by one (like firecracker discharging effect, the local air pressure explosion vibration is caused), and when the compressor runs, the shaft suspension precision is not high, as shown in fig. 2, and the deviation from the central point is serious. In order to solve the above problems, it is necessary to develop a novel air supply scheme to meet the air supply demand and improve the suspension accuracy and stability of the shaft.
As shown in fig. 3, the air bearing 7 for a compressor of a refrigeration device provided in this embodiment includes an air inlet for providing air to the bearing 7, the air inlet is provided with a temperature sensor 13 for detecting an air inlet temperature and a temperature controller 12 for controlling the air inlet temperature, and the temperature controller 12 controls the air inlet temperature according to the detection data of the temperature sensor 13, so that the air inlet is completely vaporized, and other air inlet bearings 7 do not contain small liquid beads, so as to avoid knocking caused by liquid vaporization in the cavity of the bearing 7. The temperature controller 12 is an electric heating device, and increases the temperature of the intake air in a heating manner, so that the intake air is completely vaporized.
The electric heating device comprises a heating cavity 10 communicated with the air inlet, and an electric heating device 15 is arranged in the heating cavity 10, so that gas is detected and heated in the heating cavity 10 before entering the bearing 7, and the gas is completely vaporized so as to prevent other small liquid balls from entering the bearing 7.
The temperature sensor 13 is arranged on the wall of the heating cavity 10, detects the temperature of the gas in the heating cavity 10, and ensures that the gas in the heating cavity 10 rises above the vaporization temperature.
The engine also comprises a pressure sensor 14 for detecting the intake pressure, and the temperature controller 12 controls the intake temperature according to the detection data of the temperature sensor 13 and the pressure sensor 14.
Still include with air pump 11 of air inlet intercommunication, the heating chamber is connected the air pump with between the air inlet, air pump 11 is according to pressure sensor 14's detection data control air inlet pressure guarantees that air inlet pressure maintains at suitable size, prevents that atmospheric pressure from being too little from causing bearing 7 to be unable to work, also prevents that pressure from being too big from causing other condensation simultaneously, appears little liquid pearl.
As shown in fig. 4, the air pump device further comprises a controller 12, wherein the controller 12 is used for controlling the heating of the electric heating device 15 and the pressure provided by the air pump 11 according to the detection data of the temperature sensor 13 and the pressure sensor 14.
The embodiment is an air bearing 7 applied to a compressor on refrigeration equipment, the air bearing 7 is communicated to a pipeline of the refrigeration equipment, and suspension gas of the air bearing 7 is refrigerant gas of the refrigeration equipment, so that no extra origin is needed. The air bearing 7 is communicated between the high-pressure side of the condenser and the low-pressure side of the evaporator of the refrigeration equipment, so that high-pressure gas coming out of the condenser enters the evaporator after being depressurized by the air bearing 7, the pressure of the high-pressure gas coming out of the condenser is utilized, the pressure of the high-pressure gas entering the evaporator is depressurized in advance, the air bearing 7 and the refrigeration equipment are complemented in operation, energy is saved, and the efficiency of the refrigeration equipment is improved.
The compressor comprises an impeller 1, a compressor air suction port 2, a compressor shell 3, a compressor air discharge port 4, a motor stator 5, a motor rotor 6, a bearing 7 air inlet pipe, a bearing 7 air outlet pipe, a heating cavity 10 and an air pump 11.
The high pressure side of the condenser refers to the portion of the condenser in the refrigeration cycle where the high pressure refrigerant gas enters the condenser and in the process releases heat, thereby cooling and condensing the refrigerant gas into a liquid state. This process is a critical step in the refrigeration cycle because it changes the refrigerant from a gaseous state to a liquid state to absorb heat in the evaporator and complete the refrigeration process.
The high pressure side of the condenser is the high pressure portion of the refrigeration cycle, typically where the refrigerant gas enters after being compressed by the compressor. At this time, the refrigerant gas generally has a high temperature and a high pressure. On the high pressure side of the condenser, the refrigerant gas exchanges heat with the external environment through cooling tubes or coils.
This is typically accomplished by flowing a refrigerant gas through a set of radiators or coolers, which assist in transferring heat to the surrounding air or water. The release of heat cools the refrigerant gas and, at a certain pressure, changes from a gaseous state to a liquid state. This process is called coagulation. The liquid refrigerant then flows out of the condenser into the liquid line of the refrigeration system, ready to reenter the evaporator and continue the cycle.
On the high pressure side of the condenser, a high temperature cooling medium, such as air or water, is typically required to help cool the refrigerant gas. The choice of cooling medium depends on the particular application and system design. The performance of the high pressure side of the condenser directly affects the efficiency and performance of the overall refrigeration system. Efficient condenser design and operation is one of the key factors to ensure efficient operation of the system.
The high pressure side of the condenser plays a critical role in the refrigeration cycle, which cools and condenses the high pressure refrigerant gas into a liquid, thereby providing the refrigeration system with the desired working fluid conditions to maintain operation and performance of the system. The heat release and condensation process in this process are two key aspects of the high pressure side of the condenser.
The low pressure side of the evaporator refers to a region of the evaporator section in the refrigeration cycle, typically a portion of the interior of the evaporator, for effecting the evaporation process of the refrigerant. On this low pressure side, the refrigerant changes from a liquid state to a gaseous state and absorbs heat, thereby lowering the temperature of the surrounding environment.
The low pressure side of the evaporator is the low pressure region in the refrigeration cycle, typically where the refrigerant liquid enters the evaporator. At this time, the refrigerant liquid generally has a low temperature and a low pressure. On the low pressure side of the evaporator, the refrigerant liquid begins to evaporate by contacting with the surrounding environment or cooled object. Evaporation is an endothermic process in which the refrigerant absorbs heat and changes from a liquid state to a gaseous state.
On the low pressure side of the evaporator, the refrigerant liquid absorbs heat and the temperature drops. This results in a temperature decrease of the surroundings of the refrigerant liquid, and therefore the low pressure side of the evaporator is used to provide a refrigeration effect. The performance of the low pressure side of the evaporator directly affects the efficiency and performance of the overall refrigeration system. Efficient evaporator design and operation is one of the key factors to ensure efficient operation of the system. In some applications, the low pressure side of the evaporator may also be used to control relative humidity. As the refrigerant evaporates, it can remove moisture from the surrounding environment, thereby reducing the relative humidity.
The low pressure side of the evaporator is a critical part of the refrigeration cycle for evaporating a low temperature low pressure refrigerant liquid into a gaseous state, thereby achieving the refrigeration process. In this process, the low pressure side of the evaporator plays a critical role because it causes the refrigerant to absorb heat and reduce the temperature of the surrounding environment. This helps to maintain the performance and efficiency of the refrigeration system.
The control method mainly comprises the following steps: acquiring the air inlet pressure and temperature of the air bearing 7, determining whether the temperature of the air is greater than the vaporization temperature under the current pressure according to the pressure-temperature vaporization curve of the air inlet gas, and if not, operating the temperature controller 12 to enable the air temperature to rise above the vaporization temperature; if so, no action is taken.
As shown in fig. 5, the pressure sensor 14 and the temperature sensor 13 are used for measuring the pressure and the temperature of the air supply, and the detected pressure and temperature are fed back to the controller 12, the controller 12 compares the measured pressure value with the preset air supply optimal pressure value in the program of the controller 12, if the air supply pressure is too low or too high, the controller 12 feeds back a signal to the air pump 11, and adjusts the acting speed of the air supply of the air pump 11, so that the air supply pressure is close to the preset air supply optimal pressure value in the program of the controller 12; however, after the pressure of the air supply reaches the pressure value, because small liquid drops in a gas-liquid mixed state may exist in the air supply, the controller 12 needs to perform fitting comparison between the detected temperature value and a preset pressure-temperature vaporization curve of the refrigerant in the program of the controller 12, find a corresponding temperature value in the pressure-temperature vaporization curve under the same pressure, calculate and analyze the temperature value by the controller 12, send a command to the electric heating device, enable the electric heating device to perform heating treatment on the air supply, and stop heating when the temperature is heated to be slightly higher than the corresponding temperature value in the pressure-temperature vaporization curve under the same pressure; at this time, the suspended droplets in the supply gas have all become gaseous (because when the temperature is heated to a temperature slightly higher than the corresponding temperature value in the pressure-temperature vaporization curve at the same pressure, the refrigerant is all present in gaseous form, the refrigerant pressure-temperature vaporization curve is exemplified by refrigerant tetrafluoroethane R134a, and the rest of the refrigerant is referenced to the corresponding refrigerant pressure-temperature vaporization curve); the small coolant liquid beads in the air supply are effectively eliminated, the purity of the air supply gas is guaranteed, the air pressure stability of the cavity of the bearing 7 is maintained, as shown in fig. 6, the vibration and the unstable operation of the bearing 7 are reduced, the operation stability of the shaft is improved, and the operation precision of the shaft is improved. Thereby improving reliability and stability of the compressor and the motor.
The pressure-temperature vaporization curve is a graph that describes the phase change behavior of a particular substance (typically a liquid) at different temperatures and pressures. Such patterns are observed under constant pressure conditions and are commonly used in the refrigeration and air conditioning fields as well as in chemical engineering. The vaporization curve shows the equilibrium point between liquid and gas, i.e. the phase transition point, at which the liquid begins to vaporize (become gas) or the gas begins to condense (become liquid). A well-known example is the pressure-temperature vaporization curve of water. In this graph, the horizontal axis represents temperature and the vertical axis represents pressure. Each point on the graph represents the equilibrium point of liquid water and water vapor at different temperatures and pressures. Under the conditions above the curve, water is a gas (vapor), while under the conditions below the curve, water is a liquid. The upper half of the vaporization curve represents the process of changing a liquid to a gas, which is called vaporization or evaporation. While the lower half represents the process of the gas becoming liquid, which is called condensation. Some specific points on the curve are phase transition points, where the liquid and gas are in equilibrium. For example, the atmospheric boiling point of water is 100 degrees celsius (212 degrees fahrenheit), at which temperature the water begins to boil and turn into water vapor, and at one atmosphere, this temperature is referred to as the boiling point. Pressure-temperature vaporization curves are important to the design of cooling and heating systems because they help determine the need to heat or cool a liquid at a given pressure to achieve a desired phase change. This has applications in refrigeration, air conditioning, chemical engineering and energy systems. The pressure-temperature vaporization curves vary from substance to substance because of their different physical properties (e.g., intermolecular forces). Thus, different substances have different phase change behavior under different conditions. Pressure-temperature vaporization curves are useful tools to describe the phase change behavior of a substance at different temperatures and pressures, and are of great significance for a variety of engineering and scientific applications.
Although some terms are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention. The order of execution of the operations, steps, and the like in the apparatuses and methods shown in the specification and the drawings may be any order as long as the order is not particularly limited, and the output of the preceding process is not used in the following process. The use of similar ordinal terms (e.g., "first," "then," "second," "again," "then," etc.) for convenience of description does not necessarily imply that they are necessarily performed in such order.
It will be appreciated by those of ordinary skill in the art that all directional references (e.g., above, below, upward, downward, top, bottom, left, right, vertical, horizontal, etc.) are descriptive of the drawings to aid the reader in understanding, and do not denote (e.g., position, orientation, use, etc.) limitation of the scope of the invention defined by the appended claims, only for convenience of description and simplicity of description, and unless otherwise indicated, these orientation terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, the orientation terms "inside, outside" referring to the inside and outside of the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Additionally, some ambiguous terms (e.g., substantially, certain, generally, etc.) may refer to slight imprecision or slight deviation of conditions, amounts, values, or dimensions, etc., some of which are within manufacturing tolerances or tolerances. It should be noted that, the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, so they should not be construed as limiting the scope of the present application.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (10)

1. The air bearing comprises an air inlet used for providing air for the bearing, and is characterized in that the air inlet is provided with a temperature sensor used for detecting the temperature of air inlet and a temperature controller used for controlling the temperature of air inlet, and the temperature controller controls the temperature of air inlet according to the detection data of the temperature sensor so that the air inlet is completely vaporized.
2. An air bearing according to claim 1, wherein the temperature controller is an electrical heating device.
3. An air bearing according to claim 2, wherein the electric heating means comprises a heating chamber communicating with the air inlet, an electric heating device being provided in the heating chamber.
4. A gas bearing according to claim 3, wherein the temperature sensor is provided on a wall of the heating chamber.
5. The air bearing of claim 4, further comprising a pressure sensor for detecting an intake air pressure, wherein the temperature controller controls an intake air temperature based on detection data of the temperature sensor and the pressure sensor.
6. The air bearing of claim 5, further comprising an air pump in communication with the air inlet, the heating chamber being connected between the air pump and the air inlet, the air pump controlling an intake pressure based on the sensed data from the pressure sensor.
7. Compressor, comprising an air bearing according to any one of claims 1 to 6.
8. A refrigeration apparatus comprising a compressor as recited in claim 7 wherein said air bearing is in communication with a conduit of said refrigeration apparatus, and wherein a suspension gas of said air bearing is a refrigerant gas of said refrigeration apparatus.
9. The refrigeration unit of claim 8 wherein the air bearing communicates between a condenser and an evaporator of the refrigeration unit.
10. The control method is used for the air bearing according to any one of claims 1 to 6, and is characterized in that the air bearing inlet pressure and temperature are obtained, whether the temperature of the air is higher than the vaporization temperature under the current pressure is determined according to the pressure-temperature vaporization curve of the inlet air, and if not, the temperature controller works to enable the air temperature to rise above the vaporization temperature; if so, no action is taken.
CN202311275054.4A 2023-09-28 2023-09-28 Air bearing, compressor, refrigeration equipment and control method Pending CN117267260A (en)

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CN202311275054.4A CN117267260A (en) 2023-09-28 2023-09-28 Air bearing, compressor, refrigeration equipment and control method

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Application Number Priority Date Filing Date Title
CN202311275054.4A CN117267260A (en) 2023-09-28 2023-09-28 Air bearing, compressor, refrigeration equipment and control method

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