CN214727238U - Low-pressure air knife structure - Google Patents
Low-pressure air knife structure Download PDFInfo
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- CN214727238U CN214727238U CN202121192434.8U CN202121192434U CN214727238U CN 214727238 U CN214727238 U CN 214727238U CN 202121192434 U CN202121192434 U CN 202121192434U CN 214727238 U CN214727238 U CN 214727238U
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Abstract
The utility model relates to a low-pressure air knife structure, which comprises an upper layer structure and a lower layer structure; a pressure equalizing plate is arranged between the upper layer structure and the lower layer structure; the upper layer structure is provided with a main pressure equalizing space; the airflow is introduced from the airflow channel, enters the main pressure equalizing space through the airflow guide plate, and stays in the main pressure equalizing space to perform primary airflow pressure equalization; the lower layer structure is provided with a secondary pressure-equalizing space; and the air flow which is subjected to primary air flow pressure equalization in the primary pressure equalization space enters the secondary pressure equalization space through the pressure equalization plate, is retained in the secondary pressure equalization space, is subjected to secondary air flow pressure equalization and is blown out from the air knife edge. The utility model utilizes the change adjustment of the area of the gas flow path to lead the excessive and uneven-pressure gas flow to be successively retained in the primary and secondary pressure-equalizing spaces to reach a balanced gas pressure and then output; the phenomenon that the air curtain pressure is uneven easily generated under the condition of low pressure of the whole length of the air knife is solved; the cost of setting, operating and maintaining the air supply equipment is reduced.
Description
Technical Field
The utility model belongs to the technical field of offset printing on-line measuring technique and specifically relates to a low pressure type air knife structure.
Background
The common air knife adopts compressed air as an air pressure source, the air knife gap (namely the knife edge width) is generally not more than 0.1mm, the use pressure is generally about 0.5MPa, and the air pressure blown out by the air knife in the full length is average under higher pressure.
If the fan is used as an air pressure source, because the characteristics of the fan are that the air pressure is low (about 0.01-0.03 MPa), the air volume is large, and the air pressure is completely opposite to the high air pressure and the low flow of compressed air, a common air knife cannot be adopted, the ink just printed is gelatinized by the over-high air flow, the ink can be used only after being reduced in pressure, and the low-pressure air knife is not common.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the utility model provides a low pressure type air knife structure has solved offset printing on-line measuring system and has adopted the fan to blow the flat problem of exhibition when adopting the air supply unable air knife.
The utility model provides a technical scheme that its technical problem adopted is: a low-pressure air knife structure comprises an upper layer structure and a lower layer structure; a pressure equalizing plate is arranged between the upper layer structure and the lower layer structure; the upper layer structure comprises an airflow channel, and two ends of the airflow channel are connected with an air pressure source; an airflow guide plate is arranged in the airflow channel, and a main pressure equalizing space is formed between the airflow channel and the pressure equalizing plate; the excessive and uneven-pressure airflow generated by the air pressure source is introduced from the airflow channel, enters the main pressure equalizing space through the airflow guide plate, and is retained in the main pressure equalizing space for primary airflow pressure equalization; the lower layer structure comprises an air knife edge, and a secondary pressure equalizing space is formed between the air knife edge and the pressure equalizing plate; and the air flow which is subjected to primary air flow pressure equalization in the primary pressure equalization space enters the secondary pressure equalization space through the pressure equalization plate, is retained in the secondary pressure equalization space, is subjected to secondary air flow pressure equalization and is blown out from the air knife edge.
Furthermore, both ends of the pressure equalizing plate of the utility model are connected with a height adjusting device; the height adjusting device adjusts the distance between the pressure equalizing plate and the bottom of the upper layer structure.
Still further, the air pressure source of the present invention is a fan, an air pump or an air compressor.
Still further, the clearance of the air knife edge of the air knife of the utility model is 0.5 mm-2.5 mm.
Still further, the airflow channel of the utility model is connected with an air pressure source through an air inlet pipe; the air inlet pipe extends horizontally or vertically to enter air.
The utility model has the advantages that the defects in the background technology are solved, and the excessive air flow with uneven pressure is successively retained in the primary and secondary pressure-equalizing spaces to achieve a balanced air pressure and then output by utilizing the change adjustment of the air flow path area; the phenomenon that the air curtain pressure is uneven easily generated under the condition of low pressure of the whole length of the air knife is solved; the cost of setting, operating and maintaining the air supply equipment is reduced.
Drawings
Fig. 1-2 are sectional views of the structure of the present invention;
in the figure: 1. an upper layer structure; 2. a lower layer structure; 3. a pressure equalizing plate; 4. an air flow channel; 5. an airflow guide plate; 6. a primary pressure-equalizing space; 7. a secondary pressure-equalizing space; 8. an air knife edge; 9. entering an air pipe; 10. an O-shaped sealing ring; 11. a height adjustment knob; 12. and the nut is fixed in height.
Detailed Description
The invention will now be described in further detail with reference to the drawings and preferred embodiments. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1-2, the low-pressure air knife structure includes an upper layer structure 1 and a lower layer structure 2, wherein both the upper layer structure 1 and the lower layer structure 2 are hollow structures; a pressure equalizing plate 3 is arranged between the upper layer structure 1 and the lower layer structure 2; gaps are arranged between the pressure equalizing plate 3 and the upper-layer structure 1 and between the pressure equalizing plate and the lower-layer structure 2; two ends of the pressure equalizing plate 3 are connected with a height adjusting device; the height adjusting device comprises an O-shaped sealing ring 10, a height adjusting knob 11 and a height fixing nut 12; the O-shaped sealing ring 10 can prevent the gas in the main pressure equalizing space 6 from overflowing from the gap between the height adjusting rod of the pressure equalizing plate 3 and the upper-layer structure bottom plate; the height adjusting device adjusts the distance between the pressure equalizing plate 3 and the bottom of the upper layer structure 1.
The upper layer structure 1 comprises an airflow channel 4, and two ends of the airflow channel 4 are connected with an air pressure source through an air inlet pipe 9; an airflow guide plate 5 is arranged in the airflow channel 4, the airflow channel 4 is provided with an opening, and a main pressure equalizing space 6 is arranged between the airflow channel 4 and the pressure equalizing plate 3; the excessive and uneven-pressure airflow generated by the air pressure source is introduced from the airflow channel, enters the main pressure equalizing space from the open hole through the airflow guide plate, and is retained in the main pressure equalizing space to perform primary airflow pressure equalization.
The lower layer structure 2 comprises an air knife edge 8, and the gap of the air knife edge 8 is 0.5-2.5 mm; a secondary pressure equalizing space 7 is arranged between the air knife edge 8 and the pressure equalizing plate 3; the air flow which is subjected to primary air flow pressure equalization in the primary pressure equalization space 6 enters the secondary pressure equalization space 7 through the pressure equalization plate, is retained in the secondary pressure equalization space 7, is subjected to secondary air flow pressure equalization, and is blown out from the air knife edge 8.
The utility model utilizes the change adjustment of the internal gas flow path area of the air knife to lead the excessive and uneven-pressure gas flow to be successively retained in the primary pressure-equalizing space and the secondary pressure-equalizing space, and the excessive and uneven-pressure gas flow is blown out from the air knife air port after reaching a balanced gas pressure, thereby solving the problem that the air curtain pressure is uneven under the condition of low pressure at the whole length of the air knife; the direction of the arrows in fig. 1-2 is the direction of the gas flow.
The air pressure source can be a fan, compressed air or the like; the adjustment of the distance between the pressure equalizing plate and the main pressure equalizing space bottom plate is a key element for determining the pressure equalizing effect, and the optimal value can be obtained by adjusting the distance; when the fan is used as an air pressure source, the air pressure of the fan is much smaller than the air pressure of compressed air, so that the opening degree of the air knife edge is properly increased when the fan is used compared with the gap of the air knife edge when the compressed air is used, so that similar wind power is obtained, and sufficient wind power output is ensured.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (5)
1. The utility model provides a low pressure type air knife structure which characterized in that: comprises an upper layer structure and a lower layer structure; a pressure equalizing plate is arranged between the upper layer structure and the lower layer structure; the upper layer structure comprises an airflow channel, and two ends of the airflow channel are connected with an air pressure source; an airflow guide plate is arranged in the airflow channel, and a main pressure equalizing space is formed between the airflow channel and the pressure equalizing plate; the excessive and uneven-pressure airflow generated by the air pressure source is introduced from the airflow channel, enters the main pressure equalizing space through the airflow guide plate, and is retained in the main pressure equalizing space for primary airflow pressure equalization; the lower layer structure comprises an air knife edge, and a secondary pressure equalizing space is formed between the air knife edge and the pressure equalizing plate; and the air flow which is subjected to primary air flow pressure equalization in the primary pressure equalization space enters the secondary pressure equalization space through the pressure equalization plate, is retained in the secondary pressure equalization space, is subjected to secondary air flow pressure equalization and is blown out from the air knife edge.
2. A low pressure type air knife structure as claimed in claim 1, wherein: two ends of the pressure equalizing plate are connected with a height adjusting device; the height adjusting device adjusts the distance between the pressure equalizing plate and the bottom of the upper layer structure.
3. A low pressure type air knife structure as claimed in claim 1, wherein: the air pressure source is a fan, an air pump or an air compressor.
4. A low pressure type air knife structure as claimed in claim 1, wherein: the gap between the edges of the air knives is 0.5 mm-2.5 mm.
5. A low pressure type air knife structure as claimed in claim 1, wherein: the air flow channel is connected with an air pressure source through an air inlet pipe; the air inlet pipe extends horizontally or vertically to enter air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121192434.8U CN214727238U (en) | 2021-05-31 | 2021-05-31 | Low-pressure air knife structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121192434.8U CN214727238U (en) | 2021-05-31 | 2021-05-31 | Low-pressure air knife structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214727238U true CN214727238U (en) | 2021-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121192434.8U Active CN214727238U (en) | 2021-05-31 | 2021-05-31 | Low-pressure air knife structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214727238U (en) |
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2021
- 2021-05-31 CN CN202121192434.8U patent/CN214727238U/en active Active
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