CN212838611U - Air flow prewhirl-free front guider - Google Patents
Air flow prewhirl-free front guider Download PDFInfo
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- CN212838611U CN212838611U CN202021045110.7U CN202021045110U CN212838611U CN 212838611 U CN212838611 U CN 212838611U CN 202021045110 U CN202021045110 U CN 202021045110U CN 212838611 U CN212838611 U CN 212838611U
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- Prior art keywords
- floater
- adjusting arm
- float
- connecting rod
- prewhirl
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Abstract
The utility model discloses an air flow prewhirl-free pilot device, which comprises a shell, wherein a floater adjusting arm is arranged in the shell, a hollow floater is sleeved on the floater adjusting arm, the two ends of the floater adjusting arm extend out of the floater, a Z-shaped crank is arranged in the floater, the crank comprises a long rod, an adjusting arm connecting rod and a floater connecting rod which are connected in sequence, one end of the floater connecting rod is fixedly connected to the inner side of the floater, the long rod extends out of the floater and the shell in sequence and is fixedly connected with a piston rod of a hydraulic cylinder, and a gap is arranged between the floater and; the adjusting arm connecting rod and the floater adjusting arm are oppositely provided with two round holes, and rotating shafts are installed in the two round holes in a matching mode. The problem of adjust the stator aperture of leading ware and produce unstable prewhirl among the prior art, lead to centrifugal fan efficiency to reduce, vibrate greatly is solved.
Description
Technical Field
The utility model belongs to the technical field of fluid machinery, concretely relates to air current does not have preceding ware of spiraling in advance.
Background
The centrifugal ventilator is widely applied to important industries such as agriculture, energy, chemical industry, smelting, papermaking, environmental protection and the like, is key equipment for production in various industries, and is also main energy consumption equipment. According to statistics, the electric energy consumption of the fan accounts for about 8% -10% of national generated energy, so that the optimization of the centrifugal fan has important significance for energy conservation and emission reduction.
The centrifugal ventilator is influenced by production load, process conditions and a ventilation system in the actual operation process, and is often operated inefficiently under variable working conditions, even in a fault. In order to adapt to the change, a front guider is generally installed in a flow channel of an air inlet or an air inlet chamber to adjust the performance of the ventilator, specifically, the opening degree of a guide vane of the front guider is changed to change the flow of the ventilator, so that the pipe network curve of the ventilator is changed, and the front guider is widely applied at present.
However, when the pilot device operates at different guide vane opening degrees, the obtained prerotation effect is different, and the pilot device cannot be guaranteed to work in an optimal prerotation state all the time. When the opening degree of the guide vane is small, the resistance loss caused by prerotation generated by airflow through the front guider is large, energy waste is caused, and meanwhile vibration of the unit is increased. Therefore, in order to improve the use stability of the centrifugal fan under variable working conditions and enhance the capability of the guide vanes of the front guider in adjusting the performance of the centrifugal fan, further optimization of the front guider is necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an air current does not have preceding ware of spiraling in advance, the stator aperture of the preceding ware of regulation that has solved existence among the prior art produces the unstability and revolves in advance, leads to centrifugal fan efficiency to reduce, the big problem of vibration.
The utility model adopts the technical scheme that the air flow prewhirl-free pilot device comprises a shell, wherein a floater adjusting arm is arranged in the shell, a hollow floater is sleeved on the floater adjusting arm, floaters are all extended out of the two ends of the floater adjusting arm, a Z-shaped crank is arranged in the floater, the crank comprises a long rod, an adjusting arm connecting rod and a floater connecting rod which are sequentially connected, one end of the floater connecting rod is fixedly connected to the inner side of the floater, the long rod is sequentially extended out of the floater and the shell and is fixedly connected with a piston rod of a hydraulic cylinder, and a gap is arranged between the floater and;
the adjusting arm connecting rod and the floater adjusting arm are oppositely provided with two round holes, and rotating shafts are installed in the two round holes in a matching mode.
The utility model discloses a characteristics still lie in:
the floater is formed by fixedly connecting round surfaces of two hollow cones, the central axis length of the floater is 1800-2400 mm, and the maximum diameter of the floater is 1000-1500 mm.
The shell is formed by fixedly connecting a pipe section a, a spherical shell and a pipe section b in sequence, the floater is positioned in the spherical shell, and the length of the pipe section a is 3-4 times that of the pipe section b.
The float regulating arm is in a hollow tubular shape, the inner diameter of the float regulating arm is 80-100 mm, and the length of the float regulating arm is 3000-4000 mm.
The float is connected with the float adjusting arm in a sliding way.
Both ends of the rotating shaft are provided with threads, and nuts are installed at both ends of the rotating shaft in a matching mode.
The length of the adjusting arm connecting rod is 900-950 mm, the floater connecting rod is perpendicular to the floater adjusting arm, and the distance between the floater connecting rod and the floater tip end close to the pipe section b is 530-580 mm; the long rod is perpendicular to the float adjusting arm.
The utility model has the advantages that:
the utility model relates to an air flow prewhirl-free pilot device, which has simple structure and lower cost; the traditional guide vane type front guider is improved into a float type front guider, and the gas flow is controlled by moving a float, so that the stress of the front guider under different flow areas is unchanged, and the service life of the front guider is prolonged; the front guider of the utility model slows down the impact of the air flow on the floater, effectively avoids the surge phenomenon of the centrifugal ventilator when the flow is small, and improves the operation stability of the centrifugal ventilator; the utility model relates to an air current does not have preceding ware of spiraling in advance, has reduced gas leakage quantity under the closed condition, plays good sealed effect.
Drawings
Fig. 1 is a cross-sectional view of an air flow prewhirl-free pilot device of the present invention.
In the figure, 1, a floater adjusting arm, 2, a floater, 3, a shell, 4, a crank, 5, a front guider, 6, a long rod, 7, an adjusting arm connecting rod, 8, a floater connecting rod and 9, a rotating shaft.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to an air current does not have prewhirl preceding ware, the structure is as shown in figure 1, including shell 3, be provided with float regulating arm 1 in the shell 3, the cover is equipped with hollow float 2 on the float regulating arm 1, and float 2 is all stretched out at the both ends of float regulating arm 1, be provided with Z shape crank 4 in the float 2, crank 4 is including stock 6, regulating arm connecting rod 7 and the float connecting rod 8 that connect gradually, the one end rigid coupling of float connecting rod 8 is inboard at float 2, stock 6 stretches out float 2 and shell 3 in proper order, and with the piston rod rigid coupling of pneumatic cylinder, be provided with the clearance between float 2 and the shell 3; the adjusting arm connecting rod 7 and the float adjusting arm 1 are oppositely provided with two round holes, and a rotating shaft 9 is installed in the two round holes in a matching mode.
Wherein the inner diameter of the hydraulic cylinder is 140mm, the diameter of the piston rod is 80mm, and the maximum stroke is 1000 mm;
preferably, the floater 2 is formed by fixedly connecting circular surfaces of two hollow cones, the central axis length of the floater 2 is 1800-2400 mm, and the maximum diameter is 1000-1500 mm.
Preferably, the shell 3 is formed by fixedly connecting a pipe section a, a spherical shell and a pipe section b in sequence, the floater 2 is positioned in the spherical shell, and the length of the pipe section a is 3-4 times that of the pipe section b.
Preferably, the float adjusting arm 1 is in a hollow tubular shape, the inner diameter of the float adjusting arm 1 is 80-100 mm, and the length of the float adjusting arm 1 is 3000-4000 mm.
Preferably, the float 2 is in sliding connection with the float adjusting arm 1.
Preferably, both ends of the rotating shaft 9 are provided with threads, and both ends of the rotating shaft 9 are provided with nuts in a matching manner.
Preferably, the length of the adjusting arm connecting rod 7 is 900-950 mm, the float connecting rod 8 is perpendicular to the float adjusting arm 1, and the distance between the float connecting rod 8 and the tip of the float 2 close to the pipe section b is 530-580 mm; the long rod 6 is perpendicular to the float adjusting arm 1.
Preferably, the floater 2 can adjust the airflow rate to 100%, 90%, 75%, 50% or 0% of the flow passage area of the air inlet.
The utility model relates to an air current does not have preferred scheme of preceding ware of prewhirling and does:
the length of the central axis of the floater 2 is 2328mm, and the maximum diameter is 1205 mm; the inner diameter of the float adjusting arm 1 is 100mm, and the length is 3120 mm; the length of the adjusting arm link 7 is 900mm and the distance between the link in the crank 4 and the tip of the float 2 near the pipe section b is 550 mm.
The utility model relates to an air current does not have preceding ware of spiraling in advance, the theory of operation as follows:
firstly, connecting one end of a front guider 5 with an inlet pipe section of a centrifugal fan through a flange, and connecting the other end of the front guider with a current collector of the centrifugal fan through the flange, wherein the model of the centrifugal fan is Y4-73, Y4-72 or Y5-48;
the centrifugal ventilator and the hydraulic cylinder are started, airflow enters an airflow inlet of the front guider 5 through an inlet pipe section of the centrifugal ventilator, namely the pipe section a, the hydraulic cylinder applies force to push the long rod 6 to generate displacement, meanwhile, the adjusting arm connecting rod 7 is driven to rotate, the distance X between the long rod 6 and the floater connecting rod 8 is changed, accordingly, the floater 2 generates horizontal displacement, the flow channel area of the airflow inlet is changed, the airflow enters an impeller of the centrifugal ventilator through the pipe section b, the airflow is boosted, and after the volute passes through the volute, the airflow enters a pipe network through an outlet of the centrifugal ventilator to complete fan work.
When the centrifugal ventilator is adjusted according to actual needs, only the position of the floater 2 needs to be adjusted, and the flow area is changed; the inclined angle of the float 2 in the shell 3 is 30 degrees, the air flow enters the front guider 5 under the action of the centrifugal fan, and the air flow passes through the + 30-degree flow channel in the channel of the front guider 5 and then enters the-30-degree flow channel, so the air flow axially flows out of the pipe section b of the front guider 5, and pre-rotation is not formed in the current collector.
The utility model relates to an air current does not have prewhirl preceding guide, does not have the prewhirl of negative effect in impeller entrance flow field, not only improves centrifugal fan's efficiency, has also slowed down complete machine vibrations simultaneously, has improved centrifugal fan operational stability; the utility model changes the traditional vane type front guider into the float type front guider, and the flowing direction of the air can not be changed after the inlet airflow flows through the float type front guider, so that the prerotation can not be generated in the current collector, and the surge phenomenon of the centrifugal ventilator during the small flow can be effectively avoided; meanwhile, under different guide vane opening degrees, the stress of the float type front guider is unchanged, so that the abrasion of the float is reduced, and the service life of the front guider is prolonged; the utility model relates to an air current does not have preceding ware of spiraling in advance.
Will have the current preceding ware with the utility model discloses a preceding ware 5 is installed respectively in two centrifugal fan, detects two centrifugal fan's performance respectively, wherein, the adjustable amount of wind of preceding ware corresponds preceding ware aperture 90, 72, 54 respectively for 100%, 90%, 75% of air intake runner area, and the data are seen in table 1.
TABLE 1, existing centrifugal ventilator and installation the utility model discloses centrifugal ventilator's of preceding guide 5 performance contrast
Can know by table 1, under 100%, 90%, 75% overflow area, install the utility model discloses preceding guide 5's centrifugal fan's total pressure and efficiency all are greater than current centrifugal fan, consequently, the utility model discloses a preceding guide 5 can effectively improve centrifugal fan total pressure and efficiency under less stator aperture, installs moreover the utility model discloses preceding guide 5's centrifugal fan is all bigger than current centrifugal fan's efficiency under design operating mode, large-traffic operating mode, little flow operating mode.
The utility model relates to an air current does not have preceding ware of spiraling in advance, its advantage lies in:
(1) the utility model relates to an air current does not have preceding ware of prewhirl, easy to assemble, dismantlement and air flow regulation, this preceding ware can reduce the impact loss that the air current caused when flowing through in addition, improves the air current state of impeller entry, has effectively avoided the surge phenomenon of centrifugal fan when the small discharge when improving centrifugal fan efficiency.
(2) The air flow prewhirl-free front guider can be designed into the front guider for centrifugal ventilators with different sizes, and has the advantages of wide application range, strong practicability, simple manufacturing process and low production cost; can play a better sealing role.
Claims (7)
1. The air flow prewhirl-free pilot device is characterized by comprising a shell (3), wherein a floater adjusting arm (1) is arranged in the shell (3), a hollow floater (2) is sleeved on the floater adjusting arm (1), the two ends of the floater adjusting arm (1) extend out of the floater (2), a Z-shaped crank (4) is arranged in the floater (2), the crank (4) comprises a long rod (6), an adjusting arm connecting rod (7) and a floater connecting rod (8) which are sequentially connected, one end of the floater connecting rod (8) is fixedly connected to the inner side of the floater (2), the long rod (6) sequentially extends out of the floater (2) and the shell (3) and is fixedly connected with a piston rod of a hydraulic cylinder, and a gap is formed between the floater (2) and the shell (3);
the adjusting arm connecting rod (7) and the float adjusting arm (1) are oppositely provided with two round holes, and a rotating shaft (9) is installed in the round holes in a matching mode.
2. The air flow prewhirl-free front guider of claim 1, wherein the floater (2) is formed by fixedly connecting circular surfaces of two hollow cones, the central axis length of the floater (2) is 1800-2400 mm, and the maximum diameter of the floater is 1000-1500 mm.
3. The air flow prewhirl-free front guide device as claimed in claim 2, wherein the outer shell (3) is formed by fixedly connecting a pipe section a, a spherical shell and a pipe section b in sequence, the floater (2) is positioned in the spherical shell, and the length of the pipe section a is 3-4 times of that of the pipe section b.
4. The gas flow prewhirl-free pilot device as claimed in claim 1, wherein the float adjusting arm (1) is hollow tubular, the inner diameter of the float adjusting arm (1) is 80-100 mm, and the length of the float adjusting arm is 3000-4000 mm.
5. A gas flow prewhirl-free pilot device as claimed in claim 1, wherein said float (2) is slidably connected to a float adjustment arm (1).
6. An airflow prewhirl-free front guide device as claimed in claim 1, wherein both ends of said rotating shaft (9) are provided with screw threads, and both ends of said rotating shaft (9) are provided with nuts in a matching manner.
7. The gas flow prewhirl-free pilot device as claimed in claim 3, wherein the length of the adjusting arm connecting rod (7) is 900-950 mm, the float connecting rod (8) is perpendicular to the float adjusting arm (1), and the distance between the float connecting rod (8) and the tip of the float (2) close to the pipe section b is 530-580 mm; the long rod (6) is vertical to the float adjusting arm (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021045110.7U CN212838611U (en) | 2020-06-09 | 2020-06-09 | Air flow prewhirl-free front guider |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021045110.7U CN212838611U (en) | 2020-06-09 | 2020-06-09 | Air flow prewhirl-free front guider |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212838611U true CN212838611U (en) | 2021-03-30 |
Family
ID=75171317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021045110.7U Expired - Fee Related CN212838611U (en) | 2020-06-09 | 2020-06-09 | Air flow prewhirl-free front guider |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212838611U (en) |
-
2020
- 2020-06-09 CN CN202021045110.7U patent/CN212838611U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210330 |