CN113550937A - Device for eliminating cavitation in front of pump - Google Patents
Device for eliminating cavitation in front of pump Download PDFInfo
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- CN113550937A CN113550937A CN202110794920.5A CN202110794920A CN113550937A CN 113550937 A CN113550937 A CN 113550937A CN 202110794920 A CN202110794920 A CN 202110794920A CN 113550937 A CN113550937 A CN 113550937A
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- evaporative cooling
- pipe
- working medium
- pressure air
- air cooler
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
- F01K9/02—Arrangements or modifications of condensate or air pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a device for eliminating cavitation before a pump, which comprises an evaporative cooling pipe, wherein the evaporative cooling pipe comprises an evaporative cooling outer pipe and at least one evaporative cooling inner pipe; the evaporative cooling inner pipe is connected to a conveying pipeline between the liquid storage tank and the working medium pump, the evaporative cooling outer pipe is sleeved outside the evaporative cooling inner pipe, and a sleeve cavity is formed in a gap between the evaporative cooling outer pipe and the evaporative cooling inner pipe; the wall surface of the evaporation cooling inner pipe is provided with a plurality of micropores, a gas-liquid two-phase working medium entering the sleeve cavity through the micropores is throttled and cooled, and the outer wall of the evaporation cooling inner pipe forms a heat exchange surface; the invention utilizes a throttling mode to throttle and cool part of working media in the conveying pipeline, and carries out heat exchange on the cooled gas-liquid two-phase working media and the main flow working media in the conveying pipeline, thereby reducing the temperature of the working media in the conveying pipeline under the pressure, and further achieving the purpose of eliminating the cavitation in front of the pump through the supercooling of the liquid working media.
Description
Technical Field
The invention relates to the technical field of power generation equipment, in particular to a device for eliminating cavitation in front of a pump.
Background
Due to the pressure reduction caused by the resistance of the pipeline and the pumping action of the pump or the temperature rise of the working medium caused by the heat exchange of the pipeline, the working medium in a saturated liquid state or a low supercooling degree state is vaporized, and the vaporization is easy to occur at the inlet part of the pump, such as the inlet of an impeller of a centrifugal pump. The bubbles formed by vaporization flow into the high pressure area in the pump to form local water hammer, and the pump body material is corroded and damaged to form cavitation.
In an organic Rankine cycle power generation system, in order to prevent cavitation erosion of a working medium pump, (CN111828111A) discloses a solution, a liquid storage tank is arranged at a position which is higher than an inlet of the working medium pump by more than 2m, and the pressure at the inlet of the working medium pump is ensured to be higher than vaporization pressure by utilizing height difference.
Disclosure of Invention
The invention aims to provide a device for eliminating cavitation before a pump, which aims to solve the technical problem that bubbles formed by liquid vaporization flow into a high-pressure area in the pump to form local water hammer and erode and damage pump body materials in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
an apparatus for eliminating pre-pump cavitation comprising an evaporative cooling tube comprising an evaporative cooling outer tube and at least one evaporative cooling inner tube;
the evaporative cooling inner pipe is connected to a conveying pipeline between the liquid storage tank and the working medium pump, the evaporative cooling outer pipe is sleeved outside the evaporative cooling inner pipe, and a sleeve cavity is formed in a gap between the evaporative cooling outer pipe and the evaporative cooling inner pipe;
the wall surface of the evaporative cooling inner tube is provided with a plurality of micropores, a gas-liquid two-phase working medium entering the sleeve cavity through the micropores is throttled and cooled, and the outer wall of the evaporative cooling inner tube forms a heat exchange surface for exchanging heat between the gas-liquid two-phase working medium in the sleeve cavity and the main flow working medium in the evaporative cooling inner tube.
As a preferable scheme of the present invention, the device for eliminating cavitation before the pump further includes a compressor, a high pressure air cooler, and a forced convection fan, an inlet end of the compressor is connected to the evaporation cooling outer tube through a pipeline, an outlet end of the compressor is connected to an inlet end of the high pressure air cooler, the forced convection fan is disposed at one side of the high pressure air cooler, and the working medium cooled by the high pressure air cooler is conveyed into the evaporation cooling inner tube.
As a preferred scheme of the present invention, the device for eliminating cavitation before the pump further includes a compressor, a high pressure air cooler, a forced convection fan and a heat regenerator, the evaporative cooling outer tube is connected to a cold end inlet of the heat regenerator to achieve cold energy recovery of the working medium, a cold end outlet of the heat regenerator is connected to an inlet of the compressor, an outlet of the compressor is connected to the high pressure air cooler, the forced convection fan is disposed at one side of the high pressure air cooler, and the working medium cooled by the high pressure air cooler enters a hot end of the heat regenerator to be further cooled and then is conveyed into the evaporative cooling inner tube.
In a preferred embodiment of the present invention, there is one evaporation cooling inner tube, and the sections of the evaporation cooling inner tube and the evaporation cooling outer tube form concentric circles.
As a preferable aspect of the present invention, the evaporation cooling inner tube is provided with one evaporation cooling inner tube, and the outer wall of the evaporation cooling inner tube is provided with a plurality of grooves for enlarging a heat exchange area of the outer wall of the evaporation cooling inner tube.
As a preferable scheme of the present invention, a plurality of parallel evaporative cooling inner tubes are further provided inside the evaporative cooling outer tube, and the plurality of parallel evaporative cooling inner tubes are simultaneously communicated with the conveying pipeline.
The invention also provides another device for eliminating cavitation before the pump, which comprises an evaporative cooling pipe and a throttling component;
the evaporative cooling pipe comprises an evaporative cooling outer pipe and at least one evaporative cooling inner pipe, the evaporative cooling inner pipe is connected to a conveying pipeline between the liquid storage tank and the working medium pump, the evaporative cooling outer pipe is sleeved outside the evaporative cooling inner pipe, and a sleeve cavity is formed in a gap between the evaporative cooling outer pipe and the evaporative cooling inner pipe;
the inlet end of the throttling component is communicated with the evaporative cooling inner tube, the outlet end of the throttling component is communicated with the sleeve cavity, the throttling component can throttle and cool the gaseous working medium evaporated in the evaporative cooling inner tube, and the cooled gas-liquid two-phase working medium is conveyed to the sleeve cavity to be evaporated and absorb heat.
As a preferable scheme of the invention, a refrigeration cycle device is further arranged between the throttling component and the evaporative cooling inner tube, and the refrigeration cycle device is used for reducing the temperature of the working medium at the inlet end of the throttling component.
As a preferable aspect of the present invention, the refrigeration cycle apparatus includes a compressor, a high pressure air cooler, and a forced convection fan;
the inlet end of the compressor is connected with the evaporative cooling outer pipe through a pipeline, the outlet end of the compressor is connected with the inlet end of the high-pressure air cooler, the forced convection fan is arranged on one side of the high-pressure air cooler, the working medium cooled by the high-pressure air cooler is conveyed into the throttling component for throttling and cooling, and the outlet of the throttling component is communicated with the casing cavity.
As a preferable aspect of the present invention, the refrigeration cycle apparatus includes a compressor, a high-pressure air cooler, a forced convection fan, and a heat regenerator;
the evaporative cooling outer pipe is connected with a cold end inlet of the heat regenerator to achieve cold recovery of working media, a cold end outlet of the heat regenerator is connected with an inlet of the compressor, an outlet of the compressor is connected with the high-pressure air cooler, the forced convection fan is arranged on one side of the high-pressure air cooler, the working media cooled by the high-pressure air cooler enter a hot end of the heat regenerator to be further cooled and then are conveyed into the throttling component to be throttled and cooled, and an outlet of the throttling component is communicated with the casing cavity.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes the working medium delivered by the pipeline and the working medium pump, constructs a refrigeration cycle system in the delivery pipeline in front of the pump, throttles and cools part of the working medium in the delivery pipeline by utilizing a throttling mode, and exchanges heat between the cooled gas-liquid two-phase working medium and the main flow working medium in the delivery pipeline, thereby reducing the temperature of the working medium in the delivery pipeline under the pressure, forming a certain supercooling degree, eliminating vaporization and realizing the cooling effect on the main flow working medium in the pipeline, and further achieving the purpose of eliminating cavitation in front of the pump by liquid working medium supercooling.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic structural view of an embodiment 1 of the apparatus for eliminating cavitation before a pump according to the present invention;
FIG. 2 is a schematic structural view of embodiment 2 of the apparatus for eliminating pre-pump cavitation according to the present invention;
FIG. 3 is a schematic structural diagram of embodiment 3 of the apparatus for eliminating pre-pump cavitation according to the present invention;
FIG. 4 is a schematic structural diagram of an embodiment 4 of the apparatus for eliminating cavitation before pump according to the present invention;
FIG. 5 is a schematic view of a first embodiment of an evaporative cooling tube according to the present invention;
FIG. 6 is a schematic view of a second embodiment of an evaporative cooling tube according to the present invention;
FIG. 7 is a schematic view of a third structure of the evaporative cooling tube of the present invention.
The reference numerals in the drawings denote the following, respectively:
1-evaporative cooling tubes; 2-a compressor; 3-a high pressure air cooler; 4-forced convection fan; 5-micropores; 6-a throttling component; 7-a heat regenerator;
s1-a liquid storage tank; s2-conveying line; s3-flange; s4-working medium pump;
e1-is an evaporative cooling inner tube; e2-is an evaporative cooling outer tube; e3-trench.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a device for eliminating cavitation in front of a pump, which is based on an evaporation cooling pipe and additionally integrates equipment such as a compressor, a high-pressure air cooler, a heat regenerator, a throttling component and the like. The evaporation cooling pipe has the function of coupling the pipeline in front of the pump and the cavitation eliminating device in front of the pump, and is a place where the working medium in the cavitation eliminating device in front of the pump absorbs heat in an evaporation mode and the working medium in the pipeline in front of the pump is cooled. According to the structure of the evaporative cooling pipe, the evaporative cooling pipe can only take charge of two functions of evaporation and cooling, and can also be coupled with a throttling function.
The invention discloses three evaporative cooling tube structures, and according to the part structure, a circulating throttling mode and the presence or absence of a heat regenerator, the four implementation modes are detailed as follows:
example 1
As shown in fig. 1, the device for eliminating cavitation in front of a pump comprises an evaporative cooling pipe 1, wherein the evaporative cooling pipe 1 comprises an evaporative cooling outer pipe E2 and at least one evaporative cooling inner pipe E1;
the evaporative cooling inner tube E1 is connected to a conveying pipeline S2 between a liquid storage tank S1 and a working medium pump S4, the evaporative cooling outer tube E2 is sleeved outside the evaporative cooling inner tube E1, and a sleeve cavity is formed in a gap between the evaporative cooling outer tube E2 and the evaporative cooling inner tube E1;
the wall surface of the evaporative cooling inner tube E1 is provided with a plurality of micropores 5, a gas-liquid two-phase working medium entering the sleeve cavity through the micropores 5 is throttled and cooled, and the outer wall of the evaporative cooling inner tube E1 forms a heat exchange surface for heat exchange between the gas-liquid two-phase working medium in the sleeve cavity and a main flow working medium in the evaporative cooling inner tube E1.
Meanwhile, the device for eliminating the cavitation before the pump further comprises a compressor 2, a high-pressure air cooler 3 and a forced convection fan 4, wherein the inlet end of the compressor 2 is connected with the evaporative cooling outer pipe E2 through a pipeline, the outlet end of the compressor 2 is connected with the inlet end of the high-pressure air cooler 3, the forced convection fan 4 is arranged on one side of the high-pressure air cooler 3, and the working medium cooled by the high-pressure air cooler 3 is conveyed into the evaporative cooling inner pipe E1.
The saturated working medium or the working medium with low supercooling degree flows out of the liquid storage tank, the temperature is increased and the pressure is reduced through a long pipeline, the working medium starts to be vaporized a little or has only small supercooling degree, and enters the working medium pump, so that the vaporization and the cavitation are easy to occur.
The specific process of eliminating cavitation by using the refrigeration cycle system comprises the following steps:
firstly, a working medium enters an evaporative cooling pipe 1 of a device for eliminating cavitation in front of a pump through a conveying pipeline S2 and a connecting flange S3, and part of the working medium is sprayed into a sleeve cavity between an evaporative cooling inner pipe E1 and an evaporative cooling outer pipe E2 through micropores 5 on the wall surface of the evaporative cooling inner pipe E1;
in the process of injecting a small amount of working medium, the working medium is throttled and cooled, the gas-liquid two-phase working medium with lower temperature continues to evaporate and absorb heat in the cavity of the sleeve, and the evaporation cooling inner pipe E1 and the main flow working medium in the evaporation cooling inner pipe are cooled to reach a larger supercooling degree; after a small amount of working medium is evaporated into a gas state, the gas enters the compressor 2 through a pipeline for pressurization;
the pressurized high-temperature and high-pressure working medium enters the high-pressure air cooler 3 to be cooled by outside air, and releases heat to the outside; and a small amount of cooled working medium enters the evaporative cooling inner pipe E1 to be mixed with the main flow working medium.
Example 2
In order to further recover the cold energy in the working medium after heat exchange, the difference between the embodiment and the embodiment 1 is that the refrigeration cycle pipeline is redesigned to realize cold energy recovery.
As shown in fig. 2, the device for eliminating cavitation in front of the pump comprises an evaporative cooling pipe 1, wherein the evaporative cooling pipe 1 comprises an evaporative cooling outer pipe E2 and at least one evaporative cooling inner pipe E1;
the evaporative cooling inner tube E1 is connected to a conveying pipeline S2 between a liquid storage tank S1 and a working medium pump S4, the evaporative cooling outer tube E2 is sleeved outside the evaporative cooling inner tube E1, and a sleeve cavity is formed in a gap between the evaporative cooling outer tube E2 and the evaporative cooling inner tube E1;
the wall surface of the evaporative cooling inner tube E1 is provided with a plurality of micropores 5, a gas-liquid two-phase working medium entering the sleeve cavity through the micropores 5 is throttled and cooled, and the outer wall of the evaporative cooling inner tube E1 forms a heat exchange surface for heat exchange between the gas-liquid two-phase working medium in the sleeve cavity and a main flow working medium in the evaporative cooling inner tube E1.
The device for eliminating the cavitation before the pump further comprises a compressor 2, a high-pressure air cooler 3, a forced convection fan 4 and a heat regenerator 7, wherein the evaporative cooling outer tube E2 is connected with a cold end inlet of the heat regenerator 7 to realize cold recovery of working media, a cold end outlet of the heat regenerator 7 is connected with an inlet of the compressor 2, an outlet of the compressor 2 is connected with the high-pressure air cooler 3, the forced convection fan 4 is arranged on one side of the high-pressure air cooler 3, and the working media cooled by the high-pressure air cooler 3 enter a hot end of the heat regenerator 7 to be further cooled and then are conveyed into an evaporative cooling inner tube E1.
The specific process of eliminating cavitation by using the refrigeration cycle system comprises the following steps:
firstly, a working medium enters an evaporative cooling pipe 1 of a device for eliminating cavitation before a pump through a conveying pipeline S2 and a connecting flange S3, and part of the working medium is sprayed into a collecting cavity between an evaporative cooling inner pipe E1 and an evaporative cooling outer pipe E2 through micropores 5 on the wall surface of the evaporative cooling inner pipe E1;
in the process of injecting a small amount of working medium, the working medium is throttled and cooled, the gas-liquid two-phase working medium with lower temperature is continuously evaporated and absorbed heat in the collecting cavity, and the evaporation cooling inner pipe E1 and the main flow working medium in the evaporation cooling inner pipe are cooled to reach a larger supercooling degree;
after a small amount of working medium is evaporated into a gas state, the gas enters the cold side of the heat regenerator 7 through a pipeline, the gas is heated by a hotter working medium and then enters the compressor 2 to be compressed, and the compressed high-temperature and high-pressure working medium enters the high-pressure gas cooler 3 to be cooled by outside air and release heat to the outside;
the working medium after heat release enters the hot side of the heat regenerator 7 through a pipeline, the high-temperature high-pressure working medium at the outlet of the high-pressure air cooler 3 is further cooled by using the low-temperature low-pressure working medium at the outlet of the evaporative cooling pipe 1, and a small amount of cooled working medium enters the evaporative cooling inner pipe E1 to be mixed with the main working medium.
In both of the above two embodiments, the micro-holes 5 disposed on the inner tube E1 for throttling heat exchange are used to perform throttling heat exchange on the evaporation gas, wherein the number of the inner tubes E1 is different, as shown in fig. 5-7, the present invention provides various specific structures of the evaporation cooling tube 1:
first, the evaporation cooling inner tube E1 is provided with one, and the sections of the evaporation cooling inner tube E1 and the evaporation cooling outer tube E2 form concentric circles.
Secondly, one inner tube E1 is provided, and a plurality of grooves E3 for enlarging a heat exchange area of the inner tube E1 are provided on an outer wall of the inner tube E1.
Thirdly, a plurality of parallel evaporative cooling inner tubes E1 are arranged in the evaporative cooling outer tube E2, and are simultaneously communicated with the conveying pipeline.
In addition, the invention can also realize the throttling and cooling of the gaseous working medium through the external components, specifically:
example 3
The difference between this embodiment and embodiments 1 and 2 is that an external throttling component is used for throttling and cooling.
As shown in fig. 3, the device for eliminating cavitation in front of the pump comprises an evaporative cooling pipe 1 and a throttling part 6;
the evaporative cooling pipe 1 comprises an evaporative cooling outer pipe E2 and at least one evaporative cooling inner pipe E1, the evaporative cooling inner pipe E1 is connected to a conveying pipeline S2 between a liquid storage tank S1 and a working medium pump S4, the evaporative cooling outer pipe E2 is sleeved outside the evaporative cooling inner pipe E1, and a sleeve cavity is formed in a gap between the evaporative cooling outer pipe E2 and the evaporative cooling inner pipe E1;
the inlet end of the throttling component 6 is communicated with the evaporative cooling inner tube E1, the outlet end of the throttling component 6 is communicated with the casing cavity, the throttling component 6 can throttle and cool the gaseous working medium evaporated in the evaporative cooling inner tube E1, and the cooled gas-liquid two-phase working medium is conveyed to the casing cavity to be evaporated and absorb heat.
In addition, a refrigeration cycle device is arranged between the throttling component 7 and the evaporative cooling inner tube E1, and the refrigeration cycle device is used for reducing the working medium temperature at the inlet end of the throttling component 7.
The refrigeration cycle equipment comprises a compressor 2, a high-pressure air cooler 3 and a forced convection fan 4;
the inlet end of the compressor 2 is connected with the evaporative cooling outer pipe E2 through a pipeline, the outlet end of the compressor 2 is connected with the inlet end of the high-pressure air cooler 3, the forced convection fan 4 is arranged on one side of the high-pressure air cooler 3, the working medium cooled by the high-pressure air cooler 3 is conveyed into the throttling part 6 for throttling and cooling, and the outlet of the throttling part 6 is communicated with the casing cavity.
The specific process of eliminating cavitation by using the refrigeration cycle system comprises the following steps:
firstly, working medium enters a device for eliminating cavitation before a pump through a conveying pipeline S2 and a connecting flange S3, and a small amount of working medium is evaporated into a gas state and then enters a compressor for pressurization;
the pressurized high-temperature and high-pressure working medium enters the high-pressure air cooler 3 to be cooled by outside air, and releases heat to the outside; cooled working medium enters the throttling component 6 to be throttled to realize pressure reduction and temperature reduction;
the gas-liquid two-phase working medium with lower temperature evaporates and absorbs heat in the cavity between the evaporative cooling outer pipe E2 and the evaporative cooling inner pipe E1, and the evaporative cooling inner pipe E1 and the main flow working medium inside the evaporative cooling inner pipe are cooled to reach larger supercooling degree.
Example 4
In order to further recover the cold energy in the working medium after heat exchange, the difference between the embodiment and the embodiment 3 is that the refrigeration cycle pipeline is redesigned to realize cold energy recovery, specifically:
as shown in fig. 4, the present invention provides an apparatus for eliminating cavitation before a pump, comprising an evaporative cooling tube 1 and a throttling part 6;
the evaporative cooling pipe 1 comprises an evaporative cooling outer pipe E2 and at least one evaporative cooling inner pipe E1, the evaporative cooling inner pipe E1 is connected to a conveying pipeline S2 between a liquid storage tank S1 and a working medium pump S4, the evaporative cooling outer pipe E2 is sleeved outside the evaporative cooling inner pipe E1, and a sleeve cavity is formed in a gap between the evaporative cooling outer pipe E2 and the evaporative cooling inner pipe E1;
the inlet end of the throttling component 6 is communicated with the evaporative cooling inner tube E1, the outlet end of the throttling component 6 is communicated with the casing cavity, the throttling component 6 can throttle and cool the gaseous working medium evaporated in the evaporative cooling inner tube E1, and the cooled gas-liquid two-phase working medium is conveyed to the casing cavity to be evaporated and absorb heat.
In addition, a refrigeration cycle device is arranged between the throttling component 7 and the evaporative cooling inner tube E1, and the refrigeration cycle device is used for reducing the working medium temperature at the inlet end of the throttling component 7.
The refrigeration cycle equipment comprises a compressor 2, a high-pressure air cooler 3, a forced convection fan 4 and a heat regenerator 7;
the evaporative cooling outer tube E2 is connected with a cold end inlet of the heat regenerator 7 to realize cold energy recovery of working media, a cold end outlet of the heat regenerator 7 is connected with an inlet of the compressor 2, an outlet of the compressor 2 is connected with the high-pressure air cooler 3, the forced convection fan 4 is arranged on one side of the high-pressure air cooler 3, the working media cooled by the high-pressure air cooler 3 enter the hot end of the heat regenerator 7 to be further cooled and then are conveyed into the throttling component 6 to be throttled and cooled, and an outlet of the throttling component 6 is communicated with the casing cavity.
The specific process of eliminating cavitation by using the refrigeration cycle system comprises the following steps:
firstly, a working medium enters a device for eliminating cavitation before a pump through a conveying pipeline S2 and a connecting flange S3, a small amount of working medium is evaporated into a gas state, enters the cold side of a heat regenerator 7 through a pipeline, is heated by a hotter working medium and then enters a compressor 2 to be compressed;
the compressed high-temperature high-pressure working medium enters the high-pressure air cooler 3 to be cooled by outside air and releases heat to the outside, the working medium after releasing the heat enters the hot side of the heat regenerator 7 through a pipeline, and the high-temperature high-pressure working medium at the outlet of the high-pressure air cooler 3 is further cooled by utilizing the low-temperature low-pressure working medium at the outlet of the evaporative cooling pipe 1 so as to reduce the temperature of the working medium at the inlet of the throttling part 6;
the cooled working medium enters the throttling component 6 for throttling, pressure reduction and temperature reduction, the gas-liquid two-phase working medium with lower temperature is evaporated and absorbs heat in the evaporation cooling pipe sleeve cavity, and the evaporation cooling inner pipe E1 and the main flow working medium inside the evaporation cooling inner pipe are cooled to reach larger supercooling degree.
In the above embodiments 3 and 4, the throttling member 6 may be an expansion valve, a throttle valve, a capillary tube, or the like, which can reduce the temperature by throttling.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. An apparatus for eliminating pre-pump cavitation, comprising an evaporative cooling tube (1), the evaporative cooling tube (1) comprising an evaporative cooling outer tube (E2) and at least one evaporative cooling inner tube (E1);
a sleeve cavity is formed at a gap between the outer evaporative cooling pipe (E2) and the inner evaporative cooling pipe (E1);
the wall surface of the evaporative cooling inner tube (E1) is provided with a plurality of micropores (5), a gas-liquid two-phase working medium entering the sleeve cavity through the micropores (5) is throttled and cooled, and the outer wall of the evaporative cooling inner tube (E1) forms a heat exchange surface for heat exchange between the gas-liquid two-phase working medium in the sleeve cavity and a main flow working medium in the evaporative cooling inner tube (E1).
2. The device for eliminating the cavitation before the pump according to claim 1, characterized in that, the device for eliminating the cavitation before the pump further comprises a compressor (2), a high pressure air cooler (3) and a forced convection fan (4), wherein the inlet end of the compressor (2) is connected with the evaporative cooling outer pipe (E2) through a pipeline, the outlet end of the compressor (2) is connected with the inlet end of the high pressure air cooler (3), the forced convection fan (4) is arranged at one side of the high pressure air cooler (3), and the working medium cooled by the high pressure air cooler (3) is conveyed into the evaporative cooling inner pipe (E1).
3. The device for eliminating the front pump cavitation according to claim 2, characterized in that the device for eliminating the front pump cavitation further comprises a compressor (2), a high pressure air cooler (3), a forced convection fan (4) and a heat regenerator (7), the evaporative cooling outer tube (E2) is connected with a cold end inlet of the heat regenerator (7) to achieve cold recovery of a working medium, a cold end outlet of the heat regenerator (7) is connected with an inlet of the compressor (2), an outlet of the compressor (2) is connected with the high pressure air cooler (3), the forced convection fan (4) is arranged on one side of the high pressure air cooler (3), and the working medium cooled by the high pressure air cooler (3) enters a hot end of the heat regenerator (7) to be further cooled and then is conveyed into an evaporative cooling inner tube (E1).
4. An apparatus for eliminating pre-pump cavitation as claimed in claim 3, characterized in that the inner evaporation cooling pipe (E1) is provided with one, and the inner evaporation cooling pipe (E1) and the outer evaporation cooling pipe (E2) form concentric circles in cross section.
5. An apparatus for eliminating front pump cavitation as claimed in claim 4, characterized in that the inner evaporative cooling pipe (E1) is provided with one, and a plurality of grooves (E3) for enlarging a heat exchange area of an outer wall of the inner evaporative cooling pipe (E1) are provided at an outer wall of the inner evaporative cooling pipe (E1).
6. An apparatus for eliminating pre-pump cavitation as set forth in claim 5, characterized in that a plurality of parallel evaporative cooling inner tubes (E1) are provided inside the evaporative cooling outer tube (E2), and communicate with the transport line (S2) at the same time.
7. An apparatus for eliminating pre-pump cavitation as claimed in claim 6, characterized by comprising an evaporative cooling tube (1) and a throttling member (6);
the evaporative cooling pipe (1) comprises an evaporative cooling outer pipe (E2) and at least one evaporative cooling inner pipe (E1), the evaporative cooling inner pipe (E1) is connected to a conveying pipeline (S2) between a liquid storage tank (S1) and a working medium pump (S4), the evaporative cooling outer pipe (E2) is sleeved outside the evaporative cooling inner pipe (E1), and a sleeve cavity is formed at a gap between the evaporative cooling outer pipe (E2) and the evaporative cooling inner pipe (E1);
the inlet end of the throttling component (6) is communicated with the evaporative cooling outer tube (E2), the outlet end of the throttling component (6) is communicated with the sleeve cavity, the throttling component (6) can throttle and cool the gaseous working medium evaporated in the evaporative cooling inner tube (E1), and the cooled gas-liquid two-phase working medium is conveyed to the sleeve cavity to be evaporated and absorb heat.
8. An apparatus for eliminating cavitation before pump according to claim 7, characterized in that a refrigeration cycle device is further provided between said throttle member (7) and said inner tube for evaporative cooling (E1), said refrigeration cycle device being adapted to lower the temperature of the working medium at the inlet end of said throttle member (7).
9. An apparatus for eliminating cavitation before pump according to claim 8, characterized in that the refrigeration cycle device includes a compressor (2), a high pressure air cooler (3) and a forced convection fan (4);
the inlet end of the compressor (2) is connected with the evaporative cooling outer pipe (E2) through a pipeline, the outlet end of the compressor (2) is connected with the inlet end of the high-pressure air cooler (3), the forced convection fan (4) is arranged on one side of the high-pressure air cooler (3), the working medium cooled by the high-pressure air cooler (3) is conveyed into the throttling component (6) for throttling and cooling, and the outlet of the throttling component (6) is communicated with the casing cavity.
10. An apparatus for eliminating cavitation before pump according to claim 8, characterized in that the refrigeration cycle device includes a compressor (2), a high pressure air cooler (3), a forced convection fan (4) and a regenerator (7);
the evaporative cooling outer pipe (E2) is connected with a cold end inlet of the heat regenerator (7) to achieve cold recovery of working media, a cold end outlet of the heat regenerator (7) is connected with an inlet of the compressor (2), an outlet of the compressor (2) is connected with the high-pressure air cooler (3), the forced convection fan (4) is arranged on one side of the high-pressure air cooler (3), the working media cooled by the high-pressure air cooler (3) enter a hot end of the heat regenerator (7) to be further cooled and then are conveyed into the throttling component (6) to be throttled and cooled, and an outlet of the throttling component (6) is communicated with the casing cavity.
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| CN113550937B (en) | 2023-02-07 |
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