CN217735740U - Device for improving ultimate vacuum of water-ring vacuum pump - Google Patents
Device for improving ultimate vacuum of water-ring vacuum pump Download PDFInfo
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- CN217735740U CN217735740U CN202221020104.5U CN202221020104U CN217735740U CN 217735740 U CN217735740 U CN 217735740U CN 202221020104 U CN202221020104 U CN 202221020104U CN 217735740 U CN217735740 U CN 217735740U
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Abstract
The utility model provides an improve device of water ring vacuum pump ultimate vacuum, including the water ring vacuum pump, the input of pipe connection catch water is passed through to the output of water ring vacuum pump, the one end of return air pipe connection atmospheric spraying ware is passed through to catch water's one end, the other end of atmospheric spraying ware passes through the pipe connection the input of water ring vacuum pump, the middle part of atmospheric spraying ware is through condensing the pipe connection from the condenser, this utility model discloses an atmospheric spraying ware improves water ring vacuum pump ultimate vacuum. To ensure the power plant is in the highest possible vacuum state; the matching range of the condenser and the air extraction equipment of the unit is optimized and expanded, and economic operation of the unit is facilitated; the end difference and the generated aging of the sealed water cooler can be overcome and improved within a certain range; the suction pressure in the pump is lifted, the cavitation of the pump is reduced, and the purpose of stable operation is achieved.
Description
Technical Field
The utility model relates to a vacuum pump equipment technical field, concretely relates to improve device of water ring vacuum pump ultimate vacuum.
Background
At present, the domestic power plant water ring vacuum pump mostly adopts a single-stage water ring vacuum pump.
This type of vacuum pump has a low ultimate vacuum. Compared with a water jet air extractor or a two-stage water ring vacuum pump, the limit vacuum of the pump is lower than about 2kPa, which obviously affects the economy of the unit, namely, the heat consumption of the unit is increased, and the internal efficiency is reduced (the internal power is reduced by about 2 multiplied by 0.8%).
According to the related art standard, the temperature of the suction inlet of the water ring vacuum pump should have a supercooling of 4.16 ℃, and the temperature is observed to exceed 50 ℃ on site; i.e. it cannot analyze whether its temperature has been too cold. Such high temperatures lead to an increase in the steam pressure, which necessarily requires a higher or greater efficiency of the water ring vacuum pump, in contrast to the actual operating conditions.
Along with the rising of the working water temperature of the water ring vacuum pump, the air exhaust capacity of the water ring vacuum pump is greatly reduced. The water temperature of the water ring vacuum pump is 15 ℃ (15.6 ℃ in the united states), and the correction coefficient of the air suction capacity of the water ring vacuum pump is lambda =1. Above 15 ℃, the pumping capacity will decrease, i.e. λ <1 (below 15 ℃, λ > 1). The working water temperature of the current water ring vacuum pump greatly exceeds 15 ℃, and the correction coefficient lambda of the estimated air extraction capacity is less than 0.5 according to the possible working water temperature at present, so that the influence caused by the high temperature of the extracted medium cannot be dealt with.
Isothermal compressive flow of the medium. In view of the increased temperature of the medium in the condenser at the outlet of the air cooler, an increase in the partial pressure of the steam increases the volume of the medium to be removed. At this time, the flow of the medium in the air pipe may have undergone frictional isothermal compression flow, so that the pressure loss is obviously increased, and the normal system working condition is affected, which is to be tested and analyzed.
The exhaust gas of power plant is required to have larger exhaust amount at the suction pressure of 3-8 kPa, the exhaust capacity of the single-stage water ring vacuum pump in the interval is quite weak, and when the single-stage water ring vacuum pump is provided with a one-stage atmospheric ejector, if the design is reasonable, the exhaust amount is still larger when the suction pressure is 4-5 kPa, thus greatly enlarging the application range of the single-stage water ring vacuum pump.
The research data shows that no case of independently using a single-stage water ring vacuum pump in the introduced power generation engineering is found, including the recently-produced 900MW power generation engineering of Shanghai high bridge, and the application examples are reliable technical resources and are extremely instructive, so that the feasibility, the reliability and the economy of transformation can be ensured undoubtedly.
The vacuum of the unit varies with seasons, with the year, with the region, and with the altitude, and it is difficult to confirm whether it is economical in "space time" when using and confirming the vacuum using the single-stage water ring vacuum pump unit. Since its effect is also only 2% (2 kpa), however, the effect of only 2% on the economic operation of the unit is significant.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device for improving the ultimate vacuum of a water-ring vacuum pump, aiming at solving the problem of low ultimate vacuum in the background technology; the suction inlet temperature is high, and the working water temperature is high, so that the air exhaust capacity is reduced.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an improve device of water ring vacuum pump ultimate vacuum, includes the water ring vacuum pump, the input of pipe connection catch water is passed through to the output of water ring vacuum pump, the one end of catch water's one end is passed through return-air pipe and is connected the one end of atmosphere sprayer, the other end of atmosphere sprayer passes through the pipe connection the input of water ring vacuum pump, the middle part of atmosphere sprayer is through condensing the pipe connection from the condenser.
Furthermore, one side of the water ring vacuum pump is provided with a pressure gauge.
Furthermore, the lower part of the water ring vacuum pump is connected with the lower part of the steam-water separator through a liquid supply pipeline.
Furthermore, a closed cooling water system is arranged in the middle of the liquid supply pipeline.
Furthermore, the atmosphere sprayer comprises a sprayer valve, the input end of the sprayer valve is connected with the output end of the steam-water separator through the air return pipeline, the output end of the sprayer valve is provided with a suction section, the middle of the suction section is provided with a nozzle, the output end of the suction section is provided with a mixed pipe diameter, one end of the mixed pipe diameter is connected with a diffuser through a flange plate, one end of the diffuser is provided with a spray check valve, and the lower end of the suction section and the middle of the diffuser are respectively connected with the two ends of the self-condensation pipeline.
Further, be equipped with LCW from the input of congealing the pipeline, from congealing first output pipeline of congealing of pipeline connect in the lower extreme of suction section, from congealing second output pipeline of congealing of pipeline connect in the middle part of diffuser, from congealing first output pipeline with from congealing the middle part of second output pipeline and being equipped with the thermometer respectively, from congealing the middle part of second output pipeline one side of thermometer is equipped with from congealing output check valve.
Further, the LCW and the ejector valve are respectively connected with a QFB control valve.
Furthermore, the front end of the LCW is provided with a self-condensing check valve.
Further, when the self-condensing first output pipeline is opened, the preset pressure of the self-condenser is less than 0.1bar abs.
Furthermore, when the self-condensing second output pipeline is opened, the preset pressure of the self-condenser is greater than 0.1bar abs.
Compared with the prior art, the beneficial effects of the utility model are that:
and the ultimate vacuum of the water ring vacuum pump is increased through an atmospheric ejector. To ensure the power plant is in the highest possible vacuum state; the matching range of the condenser and the air extraction equipment of the unit is optimized and expanded, and the economic operation of the unit is facilitated; the end difference and the generated aging of the sealed water cooler can be overcome and improved within a certain range; the suction pressure in the pump is lifted, the cavitation of the pump is reduced, and the purpose of stable operation is achieved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic structural view of the working principle of the present invention;
fig. 3 is a schematic diagram of the atmospheric jet structure of the present invention.
In the figure: 1. a water ring vacuum pump; 11. a pressure gauge; 12. a liquid supply conduit; 2. a steam-water separator; 3. a return air duct; 4. an atmospheric ejector; 41. an injector valve; 42. a suction section; 43. a nozzle; 44. the diameter of the mixing pipe; 45. a flange plate; 46. a diffuser; 47. an injection check valve; 5. a self-condensing pipe; 51. LCW; 511. a self-condensing check valve; 52. a self-condensing first output conduit; 53. a self-condensing second output conduit; 54. a temperature meter; 55. a self-setting output check valve; 6. a closed cooling water system; 7. QFB control valve.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings, in which several embodiments of the present invention are shown, but the present invention can be implemented in different forms, and is not limited to the embodiments described in the text, but rather, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the use of the term knowledge in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In an embodiment, please refer to fig. 1-2 with great importance, a device for improving ultimate vacuum of a water-ring vacuum pump includes a water-ring vacuum pump 1, an output end of the water-ring vacuum pump 1 is connected to an input end of a steam-water separator 2 through a pipeline, one end of the steam-water separator 2 is connected to one end of an atmospheric ejector 4 through a return-air pipeline 3, the other end of the atmospheric ejector 4 is connected to an input end of the water-ring vacuum pump 1 through a pipeline, a middle portion of the atmospheric ejector 4 is connected to a self-condenser through a self-condensing pipeline 5, one side of the water-ring vacuum pump 1 is provided with a pressure gauge 11, a lower portion of the water-ring vacuum pump 1 is connected to a lower portion of the steam-water separator 2 through a liquid supply pipeline 12, a closed cooling water system 6 is provided in the middle portion of the liquid supply pipeline 12, when a single-stage water-ring vacuum pump is provided with a first-stage atmospheric ejector, a suction pressure is 5kPa, and an air extraction amount can reach 65% -70% of an air extraction amount of a working point of the single-stage water-ring vacuum pump when the pump is provided with no atmospheric ejector.
In an embodiment, please refer to fig. 3 again, the atmospheric injector 4 includes an injector valve 41, an input end of the injector valve 41 is connected to an output end of the steam-water separator 2 through the return air pipe 3, an output end of the injector valve 41 is provided with a suction section 42, a nozzle 43 is arranged in the middle of the suction section 42, an output end of the suction section 42 is provided with a mixing pipe diameter 44, one end of the mixing pipe diameter 44 is connected to a diffuser 46 through a flange 45, one end of the diffuser 46 is provided with an injection check valve 47, and a lower end of the suction section 42 and the middle of the diffuser 46 are respectively connected to two ends of the self-condensing pipe 5.
In the embodiment, please refer to fig. 1 again, the input end of the self-condensation duct 5 is provided with an LCW51, the self-condensation first output duct 52 of the self-condensation duct 5 is connected to the lower end of the suction section 42, the self-condensation second output duct 53 of the self-condensation duct 5 is connected to the middle of the diffuser 46, the middle parts of the self-condensation first output duct 52 and the self-condensation second output duct 53 are respectively provided with a temperature gauge 54, and the middle part of the self-condensation second output duct 53 and one side of the temperature gauge 54 are provided with a self-condensation output check valve 55.
In the embodiment, please refer to fig. 1 again, the LCW51 and the injector valve 41 are respectively connected to the QFB control valve 7, and the front end of the LCW51 is provided with a self-condensing check valve 511.
In one embodiment, the self-condensing first outlet line (52) is open at a self-condenser preset pressure of <0.1bar abs, and the self-condensing second outlet line (53) is open at a self-condenser preset pressure of >0.1bar abs.
An atmospheric ejector is connected in series in front of a suction inlet of the single-stage water ring vacuum pump to form the booster water ring vacuum pump. The purpose of using a booster water ring vacuum pump is to expand the pressure range and increase the ultimate vacuum to achieve a more favorable economic operation mode. The total pressure ratio of the atmosphere ejector and the single-stage water ring vacuum pump is
=30 this total pressure ratio is assumed by the atmospheric jet injector respectively
=3.834 and single-stage water ring vacuum pump bearing
=7.792, i.e. 3.834 × 7.792=30.
The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, if the method and the technical solution of the present invention are adopted, the present invention can be directly applied to other occasions without substantial improvement, and the present invention is within the protection scope of the present invention.
Claims (8)
1. The utility model provides an improve device of water ring vacuum pump ultimate vacuum, includes water ring vacuum pump (1), its characterized in that: the output end of the water ring vacuum pump (1) is connected with the input end of a steam-water separator (2) through a pipeline, one end of the steam-water separator (2) is connected with one end of an atmospheric ejector (4) through a return air pipeline (3), the other end of the atmospheric ejector (4) is connected with the input end of the water ring vacuum pump (1) through a pipeline, and the middle part of the atmospheric ejector (4) is connected with a self-condenser through a self-condensing pipeline (5).
2. The apparatus of claim 1, wherein the apparatus comprises: and a pressure gauge (11) is arranged on one side of the water ring vacuum pump (1).
3. The apparatus of claim 1, wherein the apparatus comprises: the lower part of the water ring vacuum pump (1) is connected with the lower part of the steam-water separator (2) through a liquid supply pipeline (12).
4. An apparatus for increasing ultimate vacuum in a water-ring vacuum pump as defined in claim 3, wherein: and a closed cooling water system (6) is arranged in the middle of the liquid supply pipeline (12).
5. The apparatus of claim 1, wherein the apparatus comprises: atmosphere sprayer (4) are including sprayer valve (41), the input of sprayer valve (41) passes through return air pipe (3) is connected the output of catch water (2), the output of sprayer valve (41) is equipped with suction section (42), the middle part of suction section (42) is equipped with nozzle (43), the output of suction section (42) is equipped with mixing pipe diameter (44), diffuser (46) is passed through flange dish (45) to the one end of mixing pipe diameter (44), the one end of diffuser (46) is equipped with sprays check valve (47), the lower extreme of suction section (42) with the middle part of diffuser (46) is connected respectively the both ends of congealing pipeline (5).
6. The apparatus of claim 5, wherein the apparatus comprises: the input of congealing pipeline (5) certainly is equipped with LCW (51), congeal pipeline (5) certainly congeal first output tube way (52) connect in the lower extreme of suction segment (42), congeal pipeline (5) certainly congeal second output tube way (53) connect in the middle part of diffuser (46), congeal first output tube way (52) certainly with congeal the middle part of second output tube way (53) certainly and be equipped with thermometer (54) respectively, congeal the middle part of second output tube way (53) certainly, one side of thermometer (54) is equipped with congeals output check valve (55) certainly.
7. An apparatus for increasing ultimate vacuum in a water-ring vacuum pump as defined in claim 6, wherein: the LCW (51) and the injector valve (41) are respectively connected with a QFB control valve (7).
8. The apparatus of claim 6, wherein the apparatus comprises: and the front end of the LCW (51) is provided with a self-condensing check valve (511).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221020104.5U CN217735740U (en) | 2022-04-29 | 2022-04-29 | Device for improving ultimate vacuum of water-ring vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221020104.5U CN217735740U (en) | 2022-04-29 | 2022-04-29 | Device for improving ultimate vacuum of water-ring vacuum pump |
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| Publication Number | Publication Date |
|---|---|
| CN217735740U true CN217735740U (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221020104.5U Active CN217735740U (en) | 2022-04-29 | 2022-04-29 | Device for improving ultimate vacuum of water-ring vacuum pump |
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| Country | Link |
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| CN (1) | CN217735740U (en) |
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