CN113175445B - Air inlet housing for expanding air inflow of blower - Google Patents
Air inlet housing for expanding air inflow of blower Download PDFInfo
- Publication number
- CN113175445B CN113175445B CN202110587301.9A CN202110587301A CN113175445B CN 113175445 B CN113175445 B CN 113175445B CN 202110587301 A CN202110587301 A CN 202110587301A CN 113175445 B CN113175445 B CN 113175445B
- Authority
- CN
- China
- Prior art keywords
- air inlet
- blower
- housing body
- air
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 230000003068 static effect Effects 0.000 description 14
- 238000005273 aeration Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an air inlet housing for expanding the air inflow of a blower, which comprises an air inlet housing body and a flow expansion ring, wherein the flow expansion ring is wrapped outside the air inlet housing body, a fluid domain is formed between the flow expansion ring and the air inlet housing body, an air outlet is formed between an air inlet of the flow expansion ring and an end wall of one end of the air inlet housing body, and one end, close to an impeller of the blower, of the air inlet housing body is provided with a leakage channel for communicating the fluid domain with the inner cavity of the air inlet housing body. According to the invention, the drainage channel, the air outlet and the fluid domain are arranged, so that when the air flow in the impeller is reversed due to small flow of the blower, the high-pressure air in the impeller can flow out from the drainage channel, enter the fluid domain and then flow out from the air outlet. By the mode, the countercurrent gas in the impeller of the air blower is discharged, so that the stability of the gas flow in the impeller and the promotion of the gas pressure are ensured, the flow range of the air blower is expanded, and the efficiency of the impeller is improved compared with that of the original impeller.
Description
Technical Field
The invention relates to the technical field of centrifugal blowers, in particular to an air inlet housing for expanding the air inflow of the blower.
Background
Centrifugal blowers are often used for aeration of the bottom of a biochemical tank in the sewage treatment industry, and proper oxygen is provided for various aerobic organisms in the biochemical tank. The oxygen demand of the biochemical pool is directly related to the water depth of the biochemical pool, the organic matter content in pollutants, the ambient temperature, the atmospheric pressure and the like. When configuring the blower for the biochemical tank, various limit conditions of the parameters are considered during design, so that the calculated flow and the required pressure are both larger, the parameters are used for selecting, and the selected blower is also larger. While in actual operation, the required flow rate is much smaller than the originally designed flow rate.
The high aeration quantity in the aeration tank can lead to high nitrification in the aeration tank, so that the nitrate concentration in the sewage mixed liquid is too high. Denitrification in the tank can generate nitrogen and ammonia of the girder, so that aging of sludge is accelerated, and excessive dead sludge is decomposed and floats upwards. The phenomenon is that a large amount of white small foam is generated on the surface of the pool.
For this reason, in practical use, the sewage treatment plant needs to reduce the air volume. Since the centrifugal blower is in low flow, the flow inside the impeller is deteriorated, part of the airflow can even flow backwards and forwards against the air inlet direction, so that the blower is in airflow oscillation, and severe vibration of the blower is caused. Therefore, in practice, the air volume cannot be adjusted to be smaller. To solve this problem, on-site solutions typically operate the blower at a minimum flow rate that is stable, while the blower is treated with off-body bleed air to purge excess air. The method brings trouble to the operation of the sewage treatment plant, and further causes great energy waste and increases the operation cost.
Disclosure of Invention
The invention provides an air inlet housing for expanding the air inflow of a blower, which aims to solve the problems that the air flow inside an impeller flows in the reverse air inlet direction when the centrifugal blower is in a small flow, so that the centrifugal blower cannot stably operate in a small flow area and the like.
In order to achieve the above object, the technical scheme of the present invention is as follows:
an intake housing for expanding the intake air amount of a blower, comprising: the air inlet housing body and the flow expansion ring are wrapped outside the air inlet housing body, a fluid domain is formed between the flow expansion ring and the air inlet housing body, an air outlet is formed between an air inlet of the flow expansion ring and an end wall of one end of the air inlet housing body, and one end, close to the blower impeller, of the air inlet housing body is provided with a leakage flow channel used for communicating the fluid domain with an inner cavity of the air inlet housing body.
Further, the axial position of the bleed passage is located at the blower wheel throat.
Further, the bleed passage is inclined with respect to the blower air intake direction.
Further, the drain passage is inclined by 90 ° to 160 ° with respect to the air intake direction of the blower.
Further, the drain passage is a drain hole.
Further, one end of the flow expansion ring is provided with a flange for connecting the air inlet housing body.
Further, one end of the air inlet of the flow expansion ring is bent inwards.
Furthermore, the drainage channel can also be a drainage ring groove, the air inlet housing body is divided into a first housing body structure and a second housing body structure by the drainage ring groove, the first housing body structure and the second housing body structure are spliced through a connecting rib plate, and a flange for connecting a volute of the blower is arranged outside the second housing body structure.
Further, the cross-sectional area of the air outlet is larger than the cross-sectional area of the drain flow passage.
Further, the cross-sectional area of the air outlet is 3 to 5 times larger than the cross-sectional area of the drain passage.
The beneficial effects are that: when the impeller enters a minimum flow area allowed to be used by the blower, the air flow in the impeller flows back to cause the static pressure at the throat part of the impeller to rise, and when the static pressure rises to be greater than the static pressure at the discharge channel, part of the air flow flows out of the discharge channel, enters a fluid area and flows out of the air outlet. In this way, excess air in the blower exits the impeller. Through the improvement, the impeller efficiency can be improved compared with the original impeller, the static pressure can be greatly improved, and the flow range of the whole blower is expanded by at least 15% to the minimum flow allowed to be used by the blower.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic illustration of the axial position of a drain hole in accordance with the present invention;
FIG. 3a is a front view of a three-dimensional structure of the present invention;
FIG. 3b is a side view of a three-dimensional structure of the present invention;
FIG. 4 is a flow diagram of the interior of a blower wheel without the use of the present invention;
FIG. 5 is a diagram of the internal flow of a blower wheel using the present invention;
FIG. 6 is a schematic view of a drain ring and connecting webs of the present invention.
Wherein, 1, an air inlet housing body, 2-1, a drain hole, 2-2, a drain ring, 3, a flow expansion ring, 4, an air outlet, 5 and a fluid domain, 6, a flange, 7, bolt holes, 8, connecting rib plates, 9, a blower volute, 10, a blower impeller long blade, 11 and a blower impeller short blade.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present embodiment provides an intake housing that expands an intake air amount of a blower, as shown in fig. 1,2, including: an intake housing for expanding the intake air amount of a blower, comprising: the air inlet housing body 1 and the flow expansion ring 3, the flow expansion ring 3 wraps the air inlet housing body 1, a fluid domain 5 is formed between the flow expansion ring 3 and the air inlet housing body 1, an air outlet 4 is formed between an air inlet of the flow expansion ring 3 and an end wall of one end of the air inlet housing body 1, and one end, close to a blower impeller, of the air inlet housing body 1 is provided with a leakage channel used for communicating the fluid domain 5 and an inner cavity of the air inlet housing body 1. When the impeller enters the minimum flow allowed by the blower, the air flow in the impeller flows backwards to cause the static pressure in the throat of the impeller to rise, and when the static pressure rises to be greater than the static pressure at the discharge channel, part of the air flow flows out of the discharge channel, enters the fluid domain and flows out of the air outlet. In this way, excess air in the blower exits the impeller. Through the improvement, the impeller efficiency can be improved compared with the original impeller, and the static pressure can be greatly improved.
In a specific embodiment, the axial position of the bleed passage is located at the throat of the blower wheel, preferably the axial position of the bleed passage is located between the long lobes 10 and the short lobes 11 of the blower wheel, slightly offset from the short lobes 11.
As shown in fig. 3a and 3b, the diameter and number of the drain passages may be adjusted according to the type of blower to ensure the strength of the intake housing. Preferably the diameter of the leakage path is between 3 mm and 6 mm. The air outlet channel is inclined relative to the air inlet direction of the blower, so that air in the impeller can flow out of the air outlet channel and smoothly flow out of the fluid area. The bleed passage is at an obtuse angle θ, preferably 90 ° to 160 °, to the blower inlet direction.
The cross-sectional area of the air outlet 4 is larger than the cross-sectional area of the drain flow passage, preferably the cross-sectional area of the air outlet 4 is 3 to 5 times larger than the cross-sectional area of the drain flow passage. One end of the flow expansion ring 3 is provided with a flange 6 for connecting the air inlet housing body 1, a circle of bolt holes 7 are formed in the flange at the end part of the flow expansion ring 3, and the flow expansion ring and the air inlet housing body 1 are fixed on a blower volute 9 together.
Together with the intake housing body 1, the flow expansion ring 3 forms a fluid region 5 inside. Under normal conditions, the static pressure in the throat area of the impeller is negative, the static pressure in the leakage flow channel area is also negative, and a small amount of external air flow enters the impeller through the leakage flow channel and is normally compressed inside the impeller. However, when the impeller enters the minimum flow allowed by the blower, the air flow in the impeller will flow backwards, so that the static pressure at the throat of the impeller is increased, and when the static pressure is increased to be greater than the static pressure at the discharge channel, part of the air flow will flow out of the discharge channel, enter the fluid area and then flow out of the air outlet 4. In this way, excess gas is exhausted from the impeller. Through the improvement, the impeller efficiency can be improved compared with the original impeller, the static pressure can be greatly improved, and the flow range of the whole blower is expanded by at least 15% to the minimum flow allowed to be used by the blower.
As shown in fig. 1, 2, 3a and 3b, in a specific embodiment, the drain channel may be a drain hole 2-1, one end of the flow expansion ring 3 is provided with a flange 6 for connecting with the intake housing body 1, and one end of the intake port of the flow expansion ring 3 is bent inwards.
As shown in fig. 6, in a specific embodiment, the drainage channel may be a drainage ring groove 2-2, the drainage ring groove 2-2 divides the air intake housing body 1 into a first housing body structure 1-1 and a second housing body structure 1-2, a plurality of connection rib plates 8 uniformly distributed in the circumferential direction are arranged between the first housing body structure 1-1 and the second housing body structure 1-2 for splicing, and a flange 6 for connecting the blower volute 9 is arranged outside the second housing body structure 1-2, so as to achieve the purpose of reinforcing the air intake housing.
Fig. 4 and 5 show impeller internal flow patterns before and after modification at the same rotational speed and the same flow rate calculated using fluid analysis software. It is obvious that the invention can relieve the countercurrent of the impeller gas in small flow, thereby expanding the small flow range.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (1)
1. An intake housing for expanding the intake air amount of a blower, comprising: an air inlet housing body (1) and a flow expansion ring (3), wherein the flow expansion ring (3) is wrapped outside the air inlet housing body (1), a fluid domain (5) is formed between the flow expansion ring (3) and the air inlet housing body (1), an air outlet (4) is formed between an air inlet of the flow expansion ring (3) and an end wall of one end of the air inlet housing body (1), one end of the air inlet housing body (1) close to a blower impeller is provided with a drainage channel used for communicating the fluid domain (5) and an inner cavity of the air inlet housing body (1), the axial position of the drainage channel is located at a throat of the blower impeller, the drainage channel is inclined relative to the air inlet direction of the blower, the drainage channel is inclined by 90 DEG to 160 DEG relative to the air inlet direction of the blower, one end of the flow expansion ring (3) is provided with a flange (6) used for connecting the air inlet housing body (1), one end of the air inlet of the flow expansion ring (3) is inwards bent, the drainage channel is a drainage groove (2-2), the casing body (2-2) is used for connecting the housing body (1) and the first housing body (1) and the second housing body (1-1) are connected by the second housing structure (1-1) through the first housing structure (1-1), the second housing body structure (1-2) is externally provided with a flange (6) for connecting a blower volute (9), the cross-sectional area of the air outlet (4) is larger than that of the drainage channel, and the cross-sectional area of the air outlet (4) is 3 to 5 times that of the drainage channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110587301.9A CN113175445B (en) | 2021-05-27 | 2021-05-27 | Air inlet housing for expanding air inflow of blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110587301.9A CN113175445B (en) | 2021-05-27 | 2021-05-27 | Air inlet housing for expanding air inflow of blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113175445A CN113175445A (en) | 2021-07-27 |
| CN113175445B true CN113175445B (en) | 2024-06-04 |
Family
ID=76927532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110587301.9A Active CN113175445B (en) | 2021-05-27 | 2021-05-27 | Air inlet housing for expanding air inflow of blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113175445B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192000A (en) * | 2011-04-01 | 2011-09-21 | 康跃科技股份有限公司 | Turbine device with variable flows |
| CN102996507A (en) * | 2012-12-21 | 2013-03-27 | 中国北车集团大连机车研究所有限公司 | Internally circulating device of centrifugal air compressor |
| CN110762051A (en) * | 2019-12-13 | 2020-02-07 | 南京磁谷科技有限公司 | Surging prevention structure of magnetic suspension air compressor |
| CN111486115A (en) * | 2020-04-15 | 2020-08-04 | 浙江上风高科专风实业有限公司 | Direct-drive high-speed permanent magnet centrifugal blower and blower unit |
| CN211370769U (en) * | 2019-10-28 | 2020-08-28 | 安徽虎渡科达流体机械有限公司 | High-speed centrifugal blower |
| CN215633972U (en) * | 2021-05-27 | 2022-01-25 | 中车大连机车研究所有限公司 | Air inlet cover for expanding air inlet amount of air blower |
-
2021
- 2021-05-27 CN CN202110587301.9A patent/CN113175445B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192000A (en) * | 2011-04-01 | 2011-09-21 | 康跃科技股份有限公司 | Turbine device with variable flows |
| CN102996507A (en) * | 2012-12-21 | 2013-03-27 | 中国北车集团大连机车研究所有限公司 | Internally circulating device of centrifugal air compressor |
| CN211370769U (en) * | 2019-10-28 | 2020-08-28 | 安徽虎渡科达流体机械有限公司 | High-speed centrifugal blower |
| CN110762051A (en) * | 2019-12-13 | 2020-02-07 | 南京磁谷科技有限公司 | Surging prevention structure of magnetic suspension air compressor |
| CN111486115A (en) * | 2020-04-15 | 2020-08-04 | 浙江上风高科专风实业有限公司 | Direct-drive high-speed permanent magnet centrifugal blower and blower unit |
| CN215633972U (en) * | 2021-05-27 | 2022-01-25 | 中车大连机车研究所有限公司 | Air inlet cover for expanding air inlet amount of air blower |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113175445A (en) | 2021-07-27 |
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