CN114526244B - Shielded rotary fluid machine - Google Patents

Shielded rotary fluid machine Download PDF

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Publication number
CN114526244B
CN114526244B CN202210093351.6A CN202210093351A CN114526244B CN 114526244 B CN114526244 B CN 114526244B CN 202210093351 A CN202210093351 A CN 202210093351A CN 114526244 B CN114526244 B CN 114526244B
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China
Prior art keywords
fluid medium
chamber
rotating shaft
cavity
fluid
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CN114526244A (en
Inventor
王宏
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Tsinghua University
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Tsinghua University
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Publication of CN114526244A publication Critical patent/CN114526244A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • 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
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a shielding type rotary fluid machine. The shielded rotary fluid machine includes: the motor rotor and stator are arranged in the first cavity, the impeller is arranged at the lower end of the rotating shaft and is positioned in the second cavity, the motor rotor and the stator are arranged in the first cavity, and the pressure regulating valve is used for regulating the pressure of the first fluid medium in the first cavity. According to the shielding type rotary fluid machine provided by the embodiment of the invention, the rotating shaft, the motor rotor, the stator and the impeller can be arranged in the static sealing shell so as to avoid leakage of a second fluid medium, and meanwhile, the first fluid medium with lower density can be filled in the first cavity so as to reduce wind friction of the rotating shaft and the motor rotor.

Description

Shielded rotary fluid machine
Technical Field
The invention relates to the technical field of rotary fluid machinery, in particular to a shielding type rotary fluid machinery.
Background
For common rotary fluid machines such as pumps, fans, compressors, turbines and the like, an impeller shaft is connected with a motor shaft through a coupling, so that the impeller and the motor rotate together to work, the impeller and the motor work in different medium environments, the motor generally works in a normal pressure air environment, the impeller works in a working medium environment, a dynamic sealing device is required to be arranged at a shaft penetrating position for reducing leakage of the working medium, and the dynamic sealing device is difficult to achieve complete non-leakage.
The shielded rotary fluid machine is a fluid machine without dynamic seal, wherein an impeller and a motor are sealed in a pressure container filled with working medium, and the pressure container is only provided with static seal, so that no leakage can be realized, but with the development of the rotary fluid machine to high speed, the motor shaft, the rotor and other rotary parts have higher wind friction in the working medium with higher density, so that the heat productivity of the motor is increased, the efficiency is low, and therefore, in the high-speed rotary fluid machine, the dynamic seal design thought of the common rotary fluid machine is often returned, so that the low wind friction of the motor and the non-leakage of the working medium form the technical problem which cannot be solved simultaneously.
Disclosure of Invention
The present invention aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the invention provides a shielding type rotary fluid machine, which can avoid leakage of a second fluid medium and reduce wind friction of rotating shaft movement.
A shielded rotary fluid machine according to an embodiment of the present invention includes: a housing defining a first chamber and a second chamber in communication, the first chamber being located above the second chamber, the first chamber being filled with a first fluid medium, the second chamber being filled with a second fluid medium, the second fluid medium having a density greater than the first fluid medium by more than an order of magnitude, the housing being provided with a first flow aperture and a second flow aperture in communication with the second chamber, the housing further being provided with a third flow aperture in communication with the first chamber; the rotating shaft is at least partially structurally arranged in the first cavity, the lower end of the rotating shaft is provided with an impeller, and the impeller is positioned in the second cavity; the motor rotor and the stator are arranged in the first cavity, the motor rotor is sleeved on the rotating shaft, and the stator is sleeved on the outer side of the motor rotor; and the pressure regulating valve is connected with the third flow hole and is used for regulating the pressure of the first fluid medium in the first cavity so as to control the height of the interface between the first fluid medium and the second fluid medium.
According to the shielding type rotary fluid machine provided by the embodiment of the invention, the rotating shaft, the motor rotor, the stator and the impeller can be arranged in the static seal shell so as to avoid leakage of the second fluid medium, and meanwhile, the first fluid medium with lower density can be filled in the first cavity so as to reduce wind friction of the rotating shaft and the motor rotor, thereby being beneficial to reducing heat generation of the shielding type rotary fluid machine and improving mechanical efficiency of the shielding type rotary fluid machine.
According to some embodiments of the invention, the first fluid medium is a gas and the second fluid medium is a liquid or a supercritical fluid.
According to some embodiments of the invention, the first fluid medium is insoluble in and does not chemically react with the second fluid medium.
According to some embodiments of the invention, the housing comprises: the shell body and division board, the shell body defines installation space, the division board is located in the installation space and with installation space separates into first cavity with the second cavity, the division board be equipped with the baffle trompil that the impeller corresponds, first flow hole the second flow hole with the third flow hole is all located the shell body.
Further, the second fluid medium is adapted to flow into the first chamber, wherein the first fluid medium and the second fluid medium interface height is less than 1/3 of the first chamber height.
Further, the shielded rotary fluid machine further includes: and the interface detection device is used for detecting the height of the interface between the first fluid medium and the second fluid medium.
Further, the shielded rotary fluid machine further includes: the sleeve is arranged at the lower end of the first cavity and sleeved outside the rotating shaft, the sleeve is spaced apart from the rotating shaft, and the interface height of the first fluid medium and the second fluid medium in the first cavity is smaller than the height of the sleeve.
Further, the housing further comprises: the installation frame is arranged in the first cavity, the rotating shaft, the motor rotor and the stator are arranged in the installation frame, an installation cavity is defined between the installation frame and the shell body, a cooling device is arranged in the installation cavity and used for cooling the first fluid medium in the installation frame.
Further, the shielded rotary fluid machine further includes: the bearing assembly is arranged between the mounting frame and the rotating shaft.
Further, a cooling fan is arranged at the upper end of the rotating shaft.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural view of a shielded rotary fluid machine according to an embodiment of the present invention.
Reference numerals:
the casing 1, the casing body 11, the first flow hole 111, the second flow hole 112, the third flow hole 113, the partition plate 12, the mounting bracket 13, the first chamber 14, the seal chamber 141, the motor mounting chamber 142, the buffer chamber 143, the second chamber 15, the rotating shaft 2, the stator 3, the pressure regulating valve 4, the impeller 5, the guide pipe 6, the interface detecting device 7, the sleeve 8, the cooling device 9, the radiator fan 91, the bearing assembly 10, the upper radial bearing 101, the lower radial bearing 102, the thrust bearing 103.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
A shielded rotary fluid machine according to an embodiment of the present invention is described in detail below with reference to fig. 1.
Referring to fig. 1, a shielded rotary fluid machine includes: the device comprises a shell 1, a rotating shaft 2, a motor rotor and stator 3, an impeller 5 and a pressure regulating valve 4. The housing 1 defines a first chamber 14 and a second chamber 15 which are in communication, the first chamber 14 being located above the second chamber 15 such that the housing 1 forms a vertical structure, the first chamber 14 being filled with a first fluid medium, the second chamber 15 being filled with a second fluid medium, the second fluid medium having a density which is greater than the first fluid medium by more than an order of magnitude, i.e. under equal pressure conditions, the second fluid medium having a density which is substantially greater than the first fluid medium, the first fluid medium and the second fluid medium forming a well-defined and stable interface a due to the fact that the second fluid medium differs from the first fluid medium in density by a large amount, the second fluid medium being located always below the first fluid medium, it being understood that the second fluid medium, after filling the second chamber 15 below, will only flow into the first chamber 14 when filling the first chamber 14 with the first fluid medium.
The housing 1 is provided with a first flow hole 111 and a second flow hole 112 communicating with the second chamber 15, the second fluid medium can flow into the second chamber 15 through one of the first flow hole 111 and the second flow hole 112 and out of the second chamber 15 through the other of the first flow hole 111 and the second flow hole 112, the housing 1 is further provided with a third flow hole 113 communicating with the first chamber 14, and the first fluid medium can flow into or out of the first chamber 14 through the third flow hole 113.
At least part of the structure of the rotating shaft 2 is arranged in the first chamber 14, the rotating shaft 2 can be fully arranged in the first chamber 14, one part of the rotating shaft 2 can also be arranged in the first chamber 14, the other part of the rotating shaft 2 is arranged in the second chamber 15, the rotating shaft 2 can be vertically arranged, the impeller 5 can be coaxially arranged with the rotating shaft 2, the impeller 5 and the rotating shaft 2 synchronously rotate, the impeller 5 is arranged in the second chamber 15, the motor rotor and the stator 3 are arranged in the first chamber 14, the motor rotor is sleeved on the rotating shaft 2, the motor rotor can synchronously rotate along with the rotating shaft 2, the stator 3 is sleeved on the outer side of the motor rotor, the second fluid medium can be a working medium, when the shielding type rotary fluid machine is used for generating power, the second fluid medium pushes the impeller 5 to rotate, so that the impeller 5 drives the rotating shaft 2 to rotate, and the motor rotor on the rotating shaft 2 cuts magnetic force lines in the stator 3, thereby generating power, when the shielding type rotary fluid machine is used for applying power to the outside, the stator 3 generates a rotating magnetic field after the power, so that the motor rotor drives the impeller 5 to rotate, and the impeller 5 rotates, thereby the second fluid medium can be a shielding type rotary fluid medium, a compressor, a turbine, a compressor, and the like.
It can be understood that the casing 1 is a pressure vessel, and the impeller 5, the rotating shaft 2, the motor rotor and the stator 3 are all arranged in the casing 1, so that the second fluid serving as the working medium can be ensured to be free from leakage through static sealing between the casing 1 and the external environment.
The pressure regulating valve 4 is connected to the third flow hole 113, the pressure regulating valve 4 is used for regulating the pressure of the first fluid medium in the first chamber 14 so as to control the height of the interface a between the first fluid medium and the second fluid medium, the pressure regulating valve 4 can keep the height of the interface a at a preset height, and the preset height can be arranged between the impeller 5 and the stator 3 so that the impeller 5 is positioned below the height of the interface a, idle running of the impeller 5 is avoided, and most of the rotating shaft 2 is positioned above the interface a so as to reduce wind friction of the motion of the rotating shaft 2 through the first fluid medium with lower density. When the height of the interface a is higher than the preset height, the pressure regulating valve 4 may charge the first fluid medium into the first chamber 14 through the third flow hole 113 to lower the height of the interface a by lifting the pressure of the first fluid medium, and when the height of the interface a is lower than the preset height, the pressure regulating valve 4 discharges the first fluid medium to the outside of the housing 1 through the three flow holes to lift the height of the interface a by lowering the pressure of the first fluid medium, thereby maintaining the height of the interface a at the preset height.
According to the shielding type rotary fluid machine provided by the embodiment of the invention, the rotating shaft 2, the motor rotor, the stator 3 and the impeller 5 can be arranged in the static seal shell 1 so as to avoid leakage of a second fluid medium, and meanwhile, the first fluid medium with lower density can be filled in the first cavity 14 so as to reduce wind friction of the rotating shaft 2 and the motor rotor, thereby being beneficial to reducing heat generation of the shielding type rotary fluid machine and improving mechanical efficiency of the shielding type rotary fluid machine.
In some embodiments of the present invention, the first fluid medium is a gas to reduce friction loss of moving parts in the first chamber 14, reduce wind friction, and the second fluid medium is a liquid or supercritical fluid, so as to be used as a working medium, where the first fluid medium is insoluble in the second fluid medium and does not chemically react with the second fluid medium, so as to ensure stability of the height of the interface a, optionally, the first fluid medium is helium, or hydrogen, or nitrogen, the second fluid medium is water or supercritical carbon dioxide, and the height of the interface a between the first fluid medium and the second fluid medium is the liquid level of the second fluid medium.
In some embodiments of the present invention, referring to fig. 1, a housing 1 includes: the shell body 11 and division board 12, the shell body 11 defines the installation space, and division board 12 locates in the installation space and separates the installation space into first cavity 14 and second cavity 15, and division board 12 is equipped with the baffle trompil that corresponds with impeller 5, and the baffle trompil can be worn to locate by pivot 2, and pivot 2 has a through axle clearance or conventional mechanical seal with the baffle trompil, and shell body 11 is all located to first flow hole 111, second flow hole 112 and third flow hole 113.
In some embodiments of the invention, the shielded rotary fluid machine further comprises: the guide tube 6, the guide tube 6 is provided in one of the first flow hole 111 and the second flow hole 112, and the guide tube 6 can reduce the flow loss of the second fluid medium when flowing into or out of the second chamber 15.
Referring to fig. 1, the guide tube 6 is provided in the first flow hole 111, the axial direction of the guide tube 6 may coincide with the axial direction of the rotating shaft 2, the guide tube 6 may extend into the second chamber 15, one end of the guide tube 6 faces the impeller 5, and the other end of the guide tube 6 may extend out of the housing 1 and be provided with an interface adapted to be connected with an external member.
In some embodiments of the present invention, referring to fig. 1, the second fluid medium is adapted to flow into the first chamber 14, the second fluid medium in the second chamber 15 may flow into the first chamber 14 through the partition openings, the partition plate 12 may reduce the influence of the impeller 5 on the height of the split interface a during operation, so as to ensure the stability of the height of the interface a, the height of the interface a between the first fluid medium and the second fluid medium in the first chamber 14 is less than 1/3 of the height of the first chamber 14, optionally, the height of the interface a in the first chamber 14 is less than 1/5 or 1/10 of the height of the first chamber 14, so as to reduce the resistance of the second fluid medium with higher density to the movement of the rotating shaft 2, and reduce the friction loss of the movement of the rotating shaft 2.
In some embodiments of the present invention, referring to fig. 1, the shielded rotary fluid machine further includes: the interface detection means 7, the interface detection means 7 is used for detecting the height of the interface a of the first fluid medium and the second fluid medium, so that the pressure regulating valve 4 regulates the pressure of the first fluid medium in the first chamber 14 according to the detected height of the interface a.
Referring to fig. 1, the interface detecting device 7 is a liquid level gauge, which may be disposed at an outer side of the housing 1, one end of the liquid level gauge is communicated with the first chamber 14, the other end of the liquid level gauge is communicated with the second chamber 15, and the liquid level gauge may detect a height of the interface a based on a communicating vessel principle.
In some embodiments of the present invention, referring to fig. 1, the shielded rotary fluid machine further includes: the sleeve 8 is arranged at the lower end of the first chamber 14 and sleeved outside the rotating shaft 2, the sleeve 8 is spaced from the rotating shaft 2, the sleeve 8 is a static component which does not rotate along with the rotating shaft 2, and in the first chamber 14, the height of the interface a between the first fluid medium and the second fluid medium is smaller than that of the sleeve 8, that is, the sleeve 8 is arranged at the interface a between the first fluid medium and the second fluid medium of the first chamber 14, so that the mixing of the first fluid medium and the second fluid medium caused by the rotation of the rotating shaft 2 at the interface a can be reduced as much as possible, the stability of the height of the interface a between the first fluid medium and the second fluid medium is maintained, and bubbles in the second fluid medium are avoided.
In some embodiments of the present invention, referring to fig. 1, the housing 1 further includes: the mounting bracket 13, in the first cavity 14 is located to mounting bracket 13, and pivot 2, motor rotor and stator 3 are located in mounting bracket 13, and mounting bracket 13 can be used to fixed stator 3, and mounting bracket 13 can also be connected with pivot 2 through bearing assembly 10. The installation cavity is defined between the installation frame 13 and the shell body 11, the cooling device 9 is arranged in the installation cavity, the cooling device 9 is used for cooling a first fluid medium in the installation frame 13, heat generated by the rotating shaft 2, the motor rotor, the stator 3 and the bearing assembly 10 during operation can be conducted to the cooling device 9 through the first fluid medium, and heat can be exchanged outside the shell 1 through the cooling device 9. It will be appreciated that the first fluid medium flowing through the shaft 2, the motor rotor, the stator 3 and the bearing assembly 10 in the mounting frame 13 may exchange heat with the cooling device 9, and the cooling device 9 reduces the temperature of the shaft 2, the motor rotor, the stator 3 and the bearing assembly 10 by cooling the first fluid medium.
In some embodiments of the present invention, the cooling device 9 is a water cooling circulation device, cooling water is disposed in the cooling device 9, the cooling device 9 is further provided with a cooling flow channel communicated with the space in the mounting frame, the first fluid medium can circulate inside and outside the mounting cavity through the cooling flow channel, the first fluid medium flowing out of the mounting cavity exchanges heat with the motor rotor and the stator 3 so as to cool the motor rotor and the stator 3, the first fluid medium flowing into the mounting cavity can exchange heat with the cooling water in the cooling flow channel to reduce the temperature of the first fluid medium, and the cooling water can exchange heat with the external environment.
In some embodiments of the present invention, referring to fig. 1, the shielded rotary fluid machine further includes: bearing assembly 10, bearing assembly 10 locates between mounting bracket 13 and pivot 2, and bearing assembly 10 can support pivot 2, and optionally, the bearing assembly includes: the upper radial bearing 101, the lower radial bearing 102 and the thrust bearing 103, the upper radial bearing 101 may be disposed above the stator 3, the lower radial bearing 102 may be disposed below the stator 3, the upper radial bearing 101 and the lower radial bearing 102 may bear the radial directional load of the rotating shaft 2, the thrust bearing 103 may be disposed above the upper radial bearing 101, the thrust bearing 103 may bear the axial directional load of the rotating shaft 2, and optionally, the upper radial bearing 101, the lower radial bearing 102 and the thrust bearing 103 may each be an electromagnetic bearing or an air bearing, so as to be suitable for high rotation speed of the rotating shaft 2.
In some embodiments of the present invention, the radial clearance between the shaft 2 and the sleeve 8 is greater than the radial clearance between the shaft 2 and the radial bearing, which may be the upper radial bearing 101 and/or the lower radial bearing 102, to avoid the shaft 2 colliding with the sleeve 8 when the shaft 2 vibrates radially.
In some embodiments of the invention, the sleeve 8 is arranged at the interface a between the first fluid medium and the second fluid medium of the first chamber 14, the upper end of the sleeve 8 is higher than the interface a, the lower end of the sleeve 8 is lower than the interface a, and the height and position of the sleeve 8 can be selected based on the preset height of the interface a.
In some embodiments of the invention, the lower end of the sleeve 8 is connected to the mounting frame 13 or the partition plate 12, the upper end of the sleeve 8 is higher than the interface a, the sleeve 8 may be provided with a connection channel extending in the radial direction of the sleeve 8, the connection channel may be provided at the lower end of the sleeve 8, and the second fluid may enter the first chamber 14 through the connection channel, so as to avoid the sleeve 8 from affecting the flow of the second fluid into the first chamber 14.
In other embodiments of the invention, the sleeve 8 is connected to the outer ring of the lower radial bearing 102, and the sleeve 8 is fixed to the mounting bracket 13 by the lower radial bearing 102.
In some embodiments of the present invention, referring to fig. 1, the mounting frame 13 may be a motor housing, the mounting frame 13 may divide the first chamber 14 into at least a sealing chamber 141, a motor mounting chamber 142 and a buffer chamber 143, the sealing chamber 141 is located below the motor mounting chamber 142, the sealing chamber 141 is opened at a lower end and is communicated with the second chamber 15 through a partition opening, an upper end of the sealing chamber 141 is communicated with the motor mounting chamber 142, an upper end of the motor mounting chamber 142 is communicated with the buffer chamber 143, the third flow hole 113 is communicated with the buffer chamber 143, the rotating shaft 2 penetrates the sealing chamber 141 and the motor mounting chamber 142, the stator 3 and the bearing assembly 10 may be disposed in the motor mounting chamber 142, the second fluid medium flowing into the first chamber 14 is located in the sealing chamber 141, the sealing chamber 141 is a stationary space having a relatively large area, and a projected area of the sealing chamber 141 on a horizontal plane may be not less than 1/2 of a projected area of the second chamber 15 on a horizontal plane so as to reduce a range of fluctuation of a height of the interface a when a system pressure varies.
In some embodiments of the present invention, referring to fig. 1, a cooling fan 91 is disposed at an upper end of the rotating shaft 2, the cooling fan 91 may be disposed at a junction between the motor mounting cavity 142 and the buffer cavity 143, and when the rotating shaft 2 rotates, the cooling fan 91 may increase a flow speed of the first fluid medium in the mounting frame 13, so that heat can be timely exchanged to the outside of the housing 1 through the cooling device 9, thereby being beneficial to improving heat exchange efficiency of the cooling device 9, and enabling the shielding type rotary fluid machine to exchange heat efficiently and have a compact structure.
According to the shielding type rotary fluid machine of the embodiment of the invention, the traditional horizontally arranged shielding type rotary fluid device can be changed into the vertical type rotary fluid device, the whole equipment is statically sealed through the pressure-bearing shell 1, a driving motor or a generator is arranged in the first chamber 14 positioned above, the impeller 5 is arranged in the second chamber 15 positioned below, and meanwhile, the following structures can be added: the sleeve 8, the pressure regulating valve 4 and the interface detecting device 7, the interface detecting device 7 can display the liquid level of the working medium, the pressure regulating valve 4 can charge and discharge air to the first chamber 14 to regulate the liquid level of the working medium, and the sleeve 8 can reduce the mixing of the gas and the working medium at the interface a due to the rotation of the rotating shaft 2 as much as possible.
In addition, the shielding rotary fluid machine is provided with a relatively large static space above and below the interface a between the gas and the working medium, so that the fluctuation of the liquid level caused by the pressure change of the system is reduced, the liquid level is always controlled within the height range of the sleeve 8, and the sleeve 8 is ensured to play a role in stabilizing the liquid level.
The specific implementation principle of the shielding type rotary fluid machine according to the embodiment of the invention is as follows: the gravity effect of the substances is fully utilized, two substances which have large density differences, are not compatible and do not react with each other, an upper interface a and a lower interface a are formed, the gas substances with small density are stably positioned on the fluid working medium with large density, the motor rotor and most of the rotating shaft 2 work in the gas medium with small density, and the wind consumption of the motor is greatly reduced due to the linear relation between the wind consumption of the motor and the density of the medium, so that the efficiency of the motor and the machine set is improved. Meanwhile, by utilizing the small gap between the inner hole of the sleeve 8 and the outer diameter of the rotating shaft 2, the dynamic boundary area of the gas and the working medium which rotate along with the rotating shaft 2 is reduced, so that the mutual blending between the gas and the working medium is reduced, the working medium with high density in the second chamber 15 is ensured to be always, and the pneumatic performance of the impeller 5 is not influenced.
According to the shielding type rotary fluid machine provided by the embodiment of the invention, the shielding type rotary fluid machine can be changed into the vertical type rotary fluid machine based on the traditional horizontal type rotary fluid machine, and the sleeve 8, the pressure regulating valve 4 and the interface detection device 7 are additionally arranged, so that the structure is simple and easy to implement, the efficiency of the impeller 5 is not influenced, the air which is insoluble in a working medium and does not react with the working medium is filled, the air consumption of the motor can be greatly reduced according to the density ratio, and meanwhile, the leakage-free characteristic of the shielding type rotary fluid machine is maintained.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (8)

1. A shielded rotary fluid machine comprising:
a housing defining a first chamber and a second chamber in communication, the first chamber being located above the second chamber, the first chamber being filled with a first fluid medium, the second chamber being filled with a second fluid medium, the second fluid medium having a density greater than the first fluid medium by more than an order of magnitude, the housing being provided with a first flow aperture and a second flow aperture in communication with the second chamber, the housing further being provided with a third flow aperture in communication with the first chamber;
the rotating shaft is at least partially structurally arranged in the first cavity, the lower end of the rotating shaft is provided with an impeller, and the impeller is positioned in the second cavity;
the motor rotor and the stator are arranged in the first cavity, the motor rotor is sleeved on the rotating shaft, and the stator is sleeved on the outer side of the motor rotor;
a pressure regulating valve connected to the third flow bore, the pressure regulating valve for regulating the pressure of the first fluid medium within the first chamber to control the height of the first fluid medium to second fluid medium interface;
the housing includes: the shell body defines an installation space, the partition plate is arranged in the installation space and divides the installation space into a first chamber and a second chamber, the partition plate is provided with partition plate openings corresponding to the impellers, and the first flow holes, the second flow holes and the third flow holes are all formed in the shell body;
a heat radiation fan is arranged at the upper end of the rotating shaft;
the rotating shaft, the motor rotor, the stator and the impeller are all arranged in the static seal shell;
the shell is a pressure vessel.
2. The shielded rotary fluid machine of claim 1 wherein the first fluid medium is a gas and the second fluid medium is a liquid or a supercritical fluid.
3. The shielded rotary fluid machine of claim 1 or 2 wherein the first fluid medium is insoluble in and chemically non-reactive with the second fluid medium.
4. The shielded rotary fluid machine of claim 1 wherein the second fluid medium is adapted to flow into the first chamber, wherein the first fluid medium and the second fluid medium interface height is less than 1/3 of the first chamber height within the first chamber.
5. The shielded rotary fluid machine of claim 4 further comprising: and the interface detection device is used for detecting the height of the interface between the first fluid medium and the second fluid medium.
6. The shielded rotary fluid machine of claim 5 further comprising: the sleeve is arranged at the lower end of the first cavity and sleeved outside the rotating shaft, the sleeve is spaced apart from the rotating shaft, and the interface height of the first fluid medium and the second fluid medium in the first cavity is smaller than the height of the sleeve.
7. The shielded rotary fluid machine of claim 1 wherein the housing further comprises: the installation frame is arranged in the first cavity, the rotating shaft, the motor rotor and the stator are arranged in the installation frame, an installation cavity is defined between the installation frame and the shell body, a cooling device is arranged in the installation cavity, and the cooling device is used for cooling the first fluid medium in the installation frame.
8. The shielded rotary fluid machine of claim 7 further comprising: the bearing assembly is arranged between the mounting frame and the rotating shaft.
CN202210093351.6A 2022-01-26 2022-01-26 Shielded rotary fluid machine Active CN114526244B (en)

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