66 results about "Centrifugal chiller" patented technology

The invention provides a magnetic suspension centrifugal water chilling unit, and belongs to the field of refrigeration equipment. The magnetic suspension centrifugal water chilling unit comprises a magnetic suspension compressor, a condenser and an evaporator, the magnetic suspension compressor is connected with the condenser through an exhaust pipeline, and the condenser is connected with the magnetic suspension compressor and the evaporator through a liquid supply pipeline assembly; the system further comprises a natural process control module, the natural process control module is used for dynamically adjusting the starting sequence of a plurality of magnetic suspension compressors in the water chilling unit by determining the energy efficiency health index of the water chilling unit and calculating the energy efficiency health index, and the natural process control module is electrically connected with the central controller. And a natural process control module is arranged, a multi-dimensional energy efficiency health index model is constructed, and the starting sequence of the compressors is dynamically adjusted by integrating the actual energy efficiency ratio, the evaporation efficiency, the compressor aging coefficient, the pressure fluctuation and the environment humidity correction term.

The utility model relates to the technical field of variable-frequency centrifugal water chilling units, and discloses an anti-incrustation variable-frequency centrifugal water chilling unit which comprises a supporting frame, an evaporator, a centrifugal compressor and a condenser, and a second water inlet is formed in the position, close to the top end, of the front end of the condenser. The bottom ends of the first water inlet and the second water inlet are each provided with a slag discharging opening. The second water inlet is formed in the end face of the condenser and used for water inflow, the annular plate and the mounting plate are connected and mounted through the bolts, the filter screen is used for filtering treatment, then the transmission shaft can be driven to rotate after the driving motor works, and at the moment, the cleaning rod rotates correspondingly, and meanwhile the cleaning effect is improved. The cleaning brush can clean residues on the surface of the filter screen, at the moment, the residue discharging opening can be used for residue discharging treatment, and therefore in the working process, the overall inflow water filtering work is well improved, the proportion of impurities in water flow is reduced, and scale formation is reduced.

The invention provides an air-suspension variable-frequency centrifugal water chilling unit shutdown device and a control method. The shutdown device is installed on an air-suspension variable-frequency centrifugal water chilling unit system. The air-suspension variable-frequency centrifugal water chilling unit system comprises an evaporator, a compressor, a condenser, a first-stage throttling valve, an economizer, a second-stage throttling valve, a hot gas bypass valve and a shutdown valve, wherein the hot gas bypass valve is connected with the condenser and the evaporator, and the shutdown device comprises a compressor and a shutdown valve. The compressor has the beneficial effects that the pressure balance pipeline and the shutdown valve need to be arranged on the compressor, the shutdown valve is arranged at the proper position in the pressure balance pipeline, and the pressure balance pipeline is used for communicating the exhaust pipeline of the compressor with the air inlet pipeline; and high pressure in the exhaust pipeline is discharged to the low pressure side of the air inlet pipeline, so that permanent damage to a compressor bearing and a sealing system caused by back flushing of gas in the exhaust pipeline to the compressor is avoided, and the service life of the compressor is guaranteed.

The invention belongs to the technical field of refrigeration equipment control, and discloses an energy-saving control method of a centrifugal water chilling unit. Cooperative adjustment of the rotating speed of a compressor and the opening degree of a guide vane is achieved by obtaining operation state parameters and environment state parameters of a water chilling unit in real time, dynamically predicting the surge boundary, calculating the operation safety margin and generating an energy-saving optimization control vector. The method comprises the following steps: firstly, acquiring operation parameters such as compressor rotating speed, guide vane opening, condenser pressure and evaporator pressure and environment parameters such as environment temperature and cooling water temperature, and accurately predicting a surge boundary based on a pressure ratio, an operation condition vector and an environment correction coefficient; then analyzing the surge boundary change trend and the running state fluctuation characteristics, and determining the safety margin; and main characteristic components of the operation state are further extracted through characteristic decomposition, energy saving and safety requirements are balanced in combination with a dynamic tradeoff factor, and an optimization control vector is generated. According to the invention, the surge risk can be effectively prevented while the energy consumption is reduced, and the system adapts to complex and changeable operating environments.

The utility model provides a stand-alone system air suspension frequency conversion centrifugal water chilling unit which comprises a circulation main loop formed by connecting an evaporator, an air suspension centrifugal compressor, a condenser and an economizer through refrigerant pipelines so as to form a refrigeration circulation loop; wherein throttling pipelines are respectively arranged on a refrigerant pipeline between the condenser and the economizer and a refrigerant pipeline between the economizer and the evaporator, so that secondary throttling is carried out on a liquid refrigerant in the refrigerant pipelines; one end of the air supply pipeline is communicated with the economizer, and the other end of the air supply pipeline is communicated with the air suspension centrifugal compressor; the variable-frequency cooling pipeline comprises a frequency converter, one end of the frequency converter is communicated with the condenser through a frequency converter cooling liquid inlet pipeline, and the other end of the frequency converter is communicated with the evaporator through a frequency converter cooling air return pipeline. The unit provided by the utility model can effectively improve the refrigeration efficiency and performance, and reduce the energy consumption and operation cost, thereby realizing the efficient, energy-saving and environment-friendly refrigeration effect.

The evaporative condenser for the centrifugal water chilling unit comprises a condenser body, the upper surface of the condenser body is fixedly connected with a fixing sleeve, the inner surface of the fixing sleeve is fixedly connected with a fan filter screen, and the upper surface of the fan filter screen is fixedly connected with a first motor. Through arrangement of a second motor, a reciprocating lead screw, a brush plate and a guide rod, dust on the outer surface of an air inlet filter screen can be cleaned to prevent the dust from blocking the air inlet filter screen, so that the heat exchange efficiency of the condenser is improved, the brush plate can be detached under cooperation of a first threaded column, a first fixing nut, a second threaded column and a second fixing nut, and the service life of the condenser is prolonged. And meanwhile, through the arrangement of a dust suction head, a fan, a first connecting pipe, a second connecting pipe, a fixing box and a dust collection drawer, cleaned dust can be collected, so that the situation that the dust is spread in the air to affect the environment and personnel health is avoided.

The invention provides an air-suspension variable-frequency centrifugal water chilling unit starting control method, which is realized by an air-suspension variable-frequency centrifugal water chilling unit system, and the air-suspension variable-frequency centrifugal water chilling unit system comprises a system main path cycle, a compressor air supply cycle, a motor cooling cycle and a frequency converter cooling cycle. The method has the beneficial effects that the problem that a compressor bearing and a sealing system are damaged due to surge, stall, suction liquid carrying, current overload and the like in the starting process of the compressor of the air-suspension variable-frequency centrifugal water chilling unit can be solved.

The utility model discloses a frequency conversion centrifugal water chilling unit which comprises a frequency conversion centrifugal compressor, a condenser, an expansion valve, an evaporator, a refrigerant circulation loop, a cooling tower, a data center server, a cooling water circulation loop and a chilled water circulation loop. The cooling water circulation loop comprises a first cooling water circulation loop and a second cooling water circulation loop which are connected between the condenser and the cooling tower in parallel. The chilled water circulation loop comprises a first chilled water circulation loop and a second chilled water circulation loop which are connected between the evaporator and the data center server in parallel. According to the utility model, the two chilled water circulation loops which are connected in parallel and the two cooling water circulation loops which are connected in parallel are adopted, so that the circulation loops can be respectively controlled according to the temperature condition of the data center server in a one-main and one-standby mode, and meanwhile, any circulation loop can be independently overhauled under the condition of no shutdown; and the cold demand of the data center is ensured.

The present invention discloses an air-cooled magnetic levitation variable frequency centrifugal unit capable of reducing gas emissions, which includes a frame body, a centrifugal unit body, a control box, a condenser and a cooling fan. The centrifugal unit body is arranged inside the frame body, the control box is arranged on one side of the frame body, condensers are evenly distributed near the top of the centrifugal unit body inside the frame body, and cooling fans are evenly distributed on the top of the frame body. For this air-cooled magnetic levitation variable frequency centrifugal unit capable of reducing gas emissions, first, carbon dioxide inside the gas is preliminarily separated by a cellulose acetate membrane. Subsequently, the water pump can extract the organic amine solution through the second connecting pipe and the first connecting pipe, and then the organic amine solution is sprayed through a nozzle, so as to reduce the carbon dioxide gas during emission, thereby avoiding the greenhouse effect caused by the carbon dioxide emission of the air-cooled magnetic levitation variable frequency centrifugal unit to the surrounding area.

The utility model discloses a centrifugal chiller convenient to install, which comprises a centrifugal chiller body, a support plate, an installation component and an installation plate, the top of the support plate is fixedly installed at the bottom of the centrifugal chiller body, and the top of the installation component is fixedly installed at the bottom of the support plate. And the bottom of the mounting assembly is fixedly mounted at the bottom of the mounting plate. The centrifugal cooling-water machine is convenient to install and adjust, the centrifugal cooling-water machine body is hoisted through a crane, the guide column is guided into the guide cylinder, the guide column presses the piston downwards, and hydraulic oil in the hydraulic shell is extruded and enters the first oil way, the second oil way and the third oil way; the sealing column is extruded out of the piston by the hydraulic oil in the second oil way and the third oil way, and the sealing column drives the clamping head to enter the clamping hole in the guide column to fix the centrifugal cooling-water machine body, so that the centrifugal cooling-water machine body is prevented from deviating or inclining.

The invention belongs to the technical field of building energy supply, and discloses a combined type multi-energy energy supply system which is characterized in that a ground source heat pump unit with higher energy efficiency is preferentially started to bear basic cooling and heating loads through multi-energy optimization scheduling and gradient utilization; when the heating load in winter exceeds the maximum heating capacity of the ground source heat pump unit, the air source heat pump is started, and when the cooling load in summer exceeds the maximum cooling capacity of the ground source heat pump unit, the centrifugal water chilling unit is firstly started and then the air source heat pump is started, so that the annual comprehensive operation energy efficiency of the system is remarkably improved; a cooling tower auxiliary heat dissipation loop is arranged for a ground source heat pump, a control unit monitors the accumulated heat taking and releasing difference value of an outdoor buried pipe, and when the accumulated heat taking and releasing difference value exceeds a preset threshold value, the cooling tower is switched to discharge heat, the soil heat unbalance problem is fundamentally solved, and long-term stable operation of the system is ensured; the energy supply reliability can be improved, the building energy-saving requirement is met, and the high application and popularization value is achieved.

The invention discloses an evaporator device of an AS gas-suspended oil-free variable frequency centrifugal chiller, which belongs to the technical field of chillers. The evaporator device of an AS gas-suspended oil-free variable frequency centrifugal chiller comprises a shell, support seats are symmetrically arranged at both ends of the shell, one end of the shell is connected to an end cover 1, a water inlet and a water outlet are arranged on the end cover 1, the other end of the shell is connected to an end cover 2, a partition assembly is arranged inside the shell, a heat exchange tube penetrating the partition assembly is arranged inside the shell, filter plates are symmetrically arranged at both ends of the shell, a reciprocating assembly is movably arranged on the filter plate close to the end cover 1, a reversing assembly is connected between the reciprocating assembly and the heat exchange tube, and the evaporator device has the advantages of reciprocating movement, flexible reversing, extended flow time, efficient cooling and reliable structure.

The present invention provides a magnetic levitation centrifugal chiller, belonging to the field of refrigeration equipment. The magnetic levitation centrifugal chiller of the present invention includes a magnetic levitation compressor, a condenser and an evaporator. The magnetic levitation compressor is connected to the condenser through an exhaust pipeline, and the condenser is connected to the magnetic levitation compressor and the evaporator respectively through a liquid supply pipeline assembly. It further includes a natural process control module, which determines the energy efficiency health index of the chiller, calculates the energy efficiency health index, and is used to dynamically adjust the starting sequence of multiple magnetic levitation compressors in the chiller. The natural process control module is electrically connected to the central controller. By setting the natural process control module, a multi-dimensional energy efficiency health index model is constructed, which comprehensively considers the actual energy efficiency ratio, evaporation efficiency, compressor aging coefficient, pressure fluctuation and environmental humidity correction term to dynamically adjust the compressor starting sequence.

The purpose of the present disclosure is to suppress equipment introduction cost / equipment maintenance cost of a turbo refrigerator, to use a low-GWP refrigerant, and to make it possible to realize a use temperature of more than 100°C. A turbo refrigerator 1 according to the present disclosure comprises: a turbo compressor (3) that compresses a refrigerant; a condenser (5) that condenses the refrigerant discharged from the turbo compressor; an expansion valve (7) that expands the refrigerant guided from the condenser; and an evaporator (9) that evaporates the refrigerant guided from the expansion valve. The refrigerant sealed in a refrigerant circulation circuit 11 formed by sequentially connecting the turbo compressor, the condenser, the expansion valve, and the evaporator is HCFO-1233ydZ, HCFO-1233ydE, or a mixture thereof, and a bearing that supports the rotary shaft (19) of the turbo compressor is a magnetic bearing (21).

The air bearing comprises a bearing shell and a sealing cover, a sealing plate is arranged on the inner side of one end of the bearing shell, a porous throttling ring is arranged on the inner side of the sealing plate, a supporting ring is arranged on the surface of the inner side of the porous throttling ring, a rotor is arranged on the inner side of the supporting ring, and the sealing cover is arranged on the inner side of the rotor. The porous throttling ring is arranged in the bearing shell, the air chambers are arranged in the bearing shell and on the outer side of the porous throttling ring, the air films are arranged in the porous throttling ring and on the outer side of the rotor, and the flow isolation ring is arranged on one side in the porous throttling ring. A uniform state can be provided for an air film in the building process, contact collision between a rotor and the inner wall of an air bearing shell caused by uneven airflow pressure of the air film is prevented, damage to the rotor is avoided, and the contact area between the rotor and the interior of the porous throttling ring can be reduced through the supporting ring.

The invention relates to the technical field of oil-gas separation, in particular to an oil tank of a refrigerant centrifugal chiller and an oil-gas separation system.The oil tank comprises a filter screen and a rotating rod, the filter screen is inclined, the rotating rod is located above the lowest end of the filter screen, and a plurality of back fin plates are fixedly installed on the outer wall of the rotating rod in a circular array mode; and the back fin plate can rotate to scrape away the mixture at the lowest position of the filter screen. Through cooperation of the rotating rod, the back fin plate, the worm gear, the worm, the material passing groove and the discharging pipe, when a mixture needs to be cleaned, an operator only needs to manually rotate the worm gear and drive the worm to drive the rotating rod to rotate, the mixture is shoveled away through the back fin plate, so that the cleaning effect is achieved, and then the mixture is discharged to the outside through drainage of the discharging pipe and the material passing groove; the cleaning effect can be achieved without disassembling the equipment, and the practicability of the equipment is improved.

The invention belongs to the technical field of condensers for water chilling units, and particularly relates to a condenser device of an AS air suspension oil-free frequency conversion centrifugal water chilling unit, which comprises an evaporative condenser for the water chilling unit, the evaporative condenser comprises a shell, and a plurality of U-shaped condensation pipes are mounted on the upper part of the interior of the shell in the front-back horizontal direction; two spraying pipes are inserted into U-shaped openings of the multiple U-shaped condensation pipes and communicate with a pump body on the outer side of the bottom of the shell through a flow guide header pipe and a water guide pipe, multiple sets of spraying holes are formed in each spraying pipe, a collecting pool is formed in the bottom in the shell, and air inlet channels are formed in the positions, located above the collecting pool, of the two side walls of the shell. A fan is mounted in the ventilating barrel at the top of the shell; according to the U-shaped condenser, the contact area of sprayed cooling water and the U-shaped condenser pipe can be increased, waste of cooling water resources is avoided, and meanwhile rapid heat exchange condensation treatment can be fully conducted on a to-be-condensed medium flowing in the U-shaped condenser pipe.

1. The name of the product of this design: Centrifugal chiller (CCWG200EV). 2. Purpose of the product with this appearance design: The product with this appearance design is mainly used for the chiller unit of central air conditioning. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.

The invention discloses a magnetic suspension centrifugal water chilling unit, and relates to the field of refrigeration equipment, the magnetic suspension centrifugal water chilling unit comprises a first pipeline and a second pipeline which are used for conveying a refrigerant, the first pipeline and the second pipeline are respectively provided with an expansion mechanism, the first pipeline is communicated with the second pipeline, and the expansion mechanisms are arranged on the first pipeline and the second pipeline. A first valve and a second valve are arranged at the position where the first pipeline is communicated with the second pipeline. According to the magnetic suspension centrifugal water chilling unit, the first valve and the second valve are arranged at the communicating positions of the first pipeline and the second pipeline correspondingly, the linkage mechanism is arranged between the first valve and the second valve, and when one valve rotates, the linkage mechanism drives the other valve to rotate synchronously; therefore, the working states of the two pipelines can be conveniently adjusted at the same time, and the maintenance process can be simplified.

The utility model discloses a pressure stabilizing throttling device for a centrifugal water chilling unit, which relates to the technical field of throttling devices, and comprises a connecting pipeline, the top end of the connecting pipeline is clamped with a mounting seat, the top end of the mounting seat is fixedly connected with a limiting block, and the top end of the limiting block is in threaded connection with a screw rod. By the adoption of the structure, the bottom end of the rotating column can rotate in situ by screwing the screw rod and the rotating shaft, the connecting block inserted into the inner side of the strip-shaped opening can also prevent the throttle plate from angle deviation, and then the rotating column can be pushed or pulled to move through the screw rod so that the height of the throttle plate can be adjusted; a good pressure stabilizing and throttling effect can be achieved through blocking of the throttling plate, the sealing block can be located on the inner side of the strip-shaped opening all the time when the height of the throttling plate is adjusted, and therefore the point position of the strip-shaped opening can be effectively sealed, and normal use of the throttling plate cannot be hindered while the using sealing performance of the throttling plate is improved.

The utility model belongs to the technical field of heat dissipation of refrigerant compressors, and discloses a high-temperature cooling multi-stage series heat dissipation system of a magnetic suspension refrigerant compressor, which comprises an economizer, an evaporator, a refrigerant compressor and a condenser, a liquid taking device is arranged between the condenser and the refrigerant compressor, a cooling module is arranged in the refrigerant compressor, and the refrigerant compressor is connected with the evaporator. The air outlet end of the cooling module is connected with the evaporator, and the liquid outlet end of the cooling module is connected with the economizer; according to the magnetic suspension centrifugal water chilling unit, a high-pressure and high-temperature refrigerant multi-stage series cooling mode is adopted, on the premise that the heat dissipation effect of the refrigerant compressor is guaranteed, the temperature of the outer shell of the refrigerant compressor and the temperature of the magnetic bearing are increased, condensate water is prevented from being generated and harmed, and the operation safety of the magnetic suspension centrifugal water chilling unit is improved.

The invention relates to a negative pressure centrifugal water chiller adopting water as a refrigerant, which comprises a shell, a centrifugal compressor, a heat exchange device, a main water chamber and a controller, and the heat exchange device comprises a sealing shell, a first shell tube condensing heat exchanger, a second shell tube condensing heat exchanger, a first filter assembly, a second filter assembly and a shell tube evaporating heat exchanger, the first filtering assembly and the second filtering assembly divide the sealing shell into a first condensation cavity, an evaporation cavity and a second condensation cavity. The main water chamber comprises a first cooling water inlet chamber, a first cooling water outlet chamber, a second cooling water inlet chamber, a second cooling water outlet chamber, a chilled water inlet chamber and a chilled water outlet chamber. The flow of water vapor is increased, and the resistance is reduced as much as possible, so that the treatment capacity and efficiency of the system can be greatly improved. Compared with a conventional centrifugal cooling-water machine, the negative pressure centrifugal cooling-water machine adopting water as a refrigerant has the advantage that the natural cold source utilization capacity and stability are greatly improved.

1. The name of this design product: Centrifugal Chiller (AE Series). 2. Application of this design product: used for the main unit of industrial and commercial refrigeration equipment. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The present invention belongs to the technical field of condensers for chillers, and in particular relates to a condenser device for an AS gas-suspended oil-free variable frequency centrifugal chiller, comprising an evaporative condenser for the chiller, the evaporative condenser comprising a shell, a plurality of U-shaped condensing tubes are installed in the front and rear horizontal directions on the upper part of the shell; two spray pipes are inserted into the U-shaped openings of the plurality of U-shaped condensing tubes, the two spray pipes are connected to a pump body on the outer side of the bottom of the shell through a main flow guide pipe and a water guide pipe, a plurality of groups of spray holes are provided on each spray pipe, a collecting pool is formed at the bottom of the shell, and air inlet channels are provided on both side walls of the shell above the collecting pool, and a fan is installed in a ventilation tube on the top of the shell; the present invention can increase the contact area between the sprayed cooling water and the U-shaped condensing tube, will not cause waste of cooling water resources, and can also fully perform rapid heat exchange condensation treatment on the medium to be condensed flowing in the U-shaped condensing tube.

The utility model relates to a cooling loop of a centrifugal water chilling unit under the low-pressure-ratio working condition. The cooling loop comprises a centrifugal compressor, an evaporator, a condenser and a throttling expansion valve. The centrifugal compressor, the condenser, the throttling expansion valve and the evaporator are sequentially connected in series to form a loop; the centrifugal compressor and the condenser are also connected with a second pipeline; the second pipeline is connected with a refrigerant pump; a third pipeline is connected between the condenser and the throttling expansion valve, and the other end of the third pipeline penetrates through the second pipeline and then is communicated with the second pipeline in a turning-back mode. The second pipeline is connected with a first valve assembly; and the third pipeline is connected with a second valve assembly. The cooling loop of the centrifugal water chilling unit under the low-pressure-ratio working condition aims to overcome the existing defects, and control optimization is achieved under the condition of different pressure ratios.

1. Name of the design product: Air Suspension Centrifugal Chiller. 2. Use of the design product: A refrigeration device applied to various buildings such as commercial buildings, hospitals, schools, factories, etc., to provide cold sources for air conditioning systems. 3. Design key points of the design product: Lies in the shape. 4. Picture or photo that best shows the design key points: Perspective view 1.

The utility model provides a water energy storage cooling and heating system based on electric driving and an energy system. The system comprises a plurality of water storage tanks, a four-pipe pipeline system, a control system, and a cold storage centrifugal water chilling unit refrigerating system, a heat storage electric boiler heating system, an air-cooled heat pump unit refrigerating and heating system and a water-water heat pump unit refrigerating and heating system which are in communication connection with the control system, the cold accumulation centrifugal water chilling unit refrigerating system is used for refrigerating under the driving of a first instruction of the control system; the heat accumulating type electric boiler heating system is used for heating under the driving of a second instruction of the control system; the air-cooled heat pump unit refrigerating and heating system is used for heating under the driving of a third instruction of the control system; and the water-water heat pump unit refrigerating and heating system is used for refrigerating under the driving of a fourth instruction of the control system, or refrigerating and heating under the driving of a fifth instruction of the control system. The system has the capacity of cold storage in summer, heat storage in winter and cold storage and heat storage at the same time, and the utilization rate of the system is increased.

The invention discloses an evaporator and a centrifugal water chilling unit comprising the evaporator. The evaporator comprises a vertically-arranged evaporator shell, a support fixedly installed on the outer side of the shell and a heat exchange pipeline arranged in the shell. The heat exchange pipeline comprises a water inlet main pipe installed at the top end of the evaporator shell, a water outlet main pipe installed at the bottom end of the evaporator shell and a plurality of heat exchange branch pipes arranged between the water inlet main pipe and the water outlet main pipe in an annular array mode, and the top ends of the heat exchange branch pipes gather inwards to form a conical array with the wide lower portion and the narrow upper portion. The inner wall of the evaporator shell is correspondingly arranged to be of a conical structure with the wide lower portion and the narrow upper portion, and the conical structure and the evaporator shell jointly form a gradually-shrunk flow channel guiding refrigerant gas to flow evenly. The invention belongs to the technical field of heat exchange equipment, and achieves the technical effects that heat exchange branch pipes are arranged into a conical array with a wide lower part and a narrow upper part, and the inner wall of an evaporator shell is arranged into a conical structure, so that a tapered flow channel is constructed; when the gas rises, the flow channel sectional area is gradually reduced, and the flow speed is correspondingly increased.

The utility model discloses a throttling orifice plate, a device, a refrigerant circulation system and refrigeration equipment, the throttling orifice plate comprises a shell, a plurality of blades and an adjusting part, and a circulation opening is formed in the shell; the multiple blades are movably arranged on the shell and can be matched with one another to define a throttling opening in a preset shape, and the throttling opening is used for being communicated with the circulation opening. The adjusting component is used for driving the blades to move synchronously, so that the diameter of the throttling opening is adjustable. According to the centrifugal water chilling unit, the blades are driven by the adjusting component to move so that the diameter of the throttling opening defined by the multiple blades can be adjusted, the optimal performance of the centrifugal water chilling unit can be adjusted with low cost, the passing shape of the throttling orifice is controllable based on the design of the blades, and the performance loss is small.

The utility model provides an oil tank pressure adjusting system and a centrifugal water chilling unit. According to one embodiment of the invention, the oil tank pressure regulating system comprises a centrifugal compressor, a pressure regulating device and a pressure regulating device, the centrifugal compressor comprises a bearing cavity, a motor cavity and a bearing arranged in the bearing cavity, and the pressure in the motor cavity is larger than that in the bearing cavity; the oil tank comprises an oil supply port, an oil return port and an exhaust port, the oil supply port is communicated with the bearing and used for lubricating the bearing, and the oil return port is communicated with the bearing cavity; and the first auxiliary compressor is communicated with the exhaust port and is used for being communicated to an evaporator. According to the scheme, the pressure in the oil tank can be reduced, and then the solubility of a refrigerant in lubricating oil is reduced.