CN115478240B

CN115478240B - Air knife

Info

Publication number: CN115478240B
Application number: CN202211047657.4A
Authority: CN
Inventors: 彭文杰; 李山青; 杜蓉; 王毅; 杨芃; 周诗正
Original assignee: Wuhan Iron and Steel Co Ltd
Current assignee: Wuhan Iron and Steel Co Ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2023-07-18
Anticipated expiration: 2042-08-30
Also published as: CN115478240A

Abstract

The application discloses an air knife belongs to hot dip coating technology technical field to solve the inhomogeneous unstable technical problem of air knife gassing at present. The air knife includes: the shell is provided with a containing cavity, an air inlet and an air outlet, and the air inlet is communicated with the air outlet; the supporting piece is arranged in the accommodating cavity and between the air inlet and the air outlet, and the fixing piece is connected with the shell and used for adjusting the opening area of the air outlet; the guide piece is arranged in the accommodating cavity, is connected with at least one of the supporting piece and the fixing piece, and is arranged towards the direction of the air outlet, so that the air in the accommodating cavity can flow out of the air outlet. The air guide piece arranged towards the air outlet is arranged on at least one of the fixing piece and the supporting piece, so that air passing through the fixing piece or the supporting piece can flow to the air outlet under the guide of the air guide piece, the vortex street of the air caused by the fixing piece and the supporting piece is relieved, and the uniformity and the stability of the air blown out from the air outlet are improved.

Description

Air knife

Technical Field

The application belongs to the technical field of hot dip coating processes, and particularly relates to an air knife.

Background

The air knife is an important process device for hot galvanizing production, and has important influence on the quality of hot galvanizing products. In the continuous hot galvanizing production line, the air knife sprays continuous flat airflow like a knife by adopting a pair of slit-shaped nozzles which traverse the whole width of the strip steel, redundant zinc liquid on the surface of the strip steel is blown off, a uniform and proper zinc layer is left on the surface of the strip steel, and the zinc liquid is returned into a zinc pot, so that the aim of reasonably controlling the hot galvanizing zinc layer is fulfilled. The greater the air pressure blown out by the air knife, the stronger the zinc scraping capability of the air knife, and the smaller the thickness of the zinc layer on the surface of the strip steel. The surface quality defect of the hot dip galvanized product has strong correlation with the air knife, and the air flow of the air knife needs to have very good stability and uniformity, otherwise, the hot dip galvanized surface defect can be generated.

When the air knife of the related technology is used for hot dip coating production, the surface of the strip steel is easy to generate the situation of random local zinc layer thickening, and the reason is mainly because the air pressure blown out by the air knife is poor in uniformity and stability, so that the air pressure on the surface of the strip steel is uneven, and finally the defect of local zinc layer thickening is presented.

Disclosure of Invention

The air knife air outlet device aims at solving the technical problem that air knife air outlet is uneven and unstable to a certain extent. To this end, the present application provides an air knife.

In a first aspect, an air knife provided in an embodiment of the present application includes:

the shell is provided with a containing cavity, an air inlet and an air outlet, and the air inlet is communicated with the air outlet;

the supporting piece is arranged in the accommodating cavity and between the air inlet and the air outlet,

the fixing piece is connected with the shell and used for adjusting the opening area of the air outlet;

the flow guiding piece is arranged in the accommodating cavity, is connected with at least one of the supporting piece and the fixing piece, and is arranged towards the direction of the air outlet, so that the air in the accommodating cavity can flow out of the air outlet.

Because the fixing piece and the supporting piece arranged in the accommodating cavity are mostly in cylindrical structures, vortex streets are easy to form when gas passes through the fixing piece and the supporting piece, so that the gas flow speed is uneven, and meanwhile, the speed and the gas outlet quantity of the gas blown out from the gas outlet are also influenced. The air guide piece arranged towards the air outlet is arranged on at least one of the fixing piece and the supporting piece, so that air passing through the fixing piece or the supporting piece can flow to the air outlet under the guide of the air guide piece, the vortex street of the air caused by the fixing piece and the supporting piece is relieved, and the uniformity and the stability of the air blown out from the air outlet are improved.

In this application optional embodiment, the mounting is the contained angle setting with the air current direction, the water conservancy diversion piece with the mounting is connected, and with the mounting is the contained angle setting, makes the water conservancy diversion piece orientation the air current direction setting of gas outlet.

In an alternative embodiment of the present application, the flow guiding member comprises a flow guiding section and a fixing section which are connected to each other, the fixing section is connected to the fixing member, and the flow guiding section is arranged towards the air flow direction of the air outlet.

In an optional embodiment of the present application, an end of the flow guiding section away from the fixed section has a flow guiding point, and the flow guiding point is disposed close to the air outlet.

In this application optional embodiment, the guide section includes first guide surface and second guide surface, the one end of first guide surface with the fixed section is connected, the other end with the second guide surface is connected, the second guide surface is kept away from the one end of first guide surface with the connecting section is kept away from the one end of first guide surface is connected, the guide point sets up first guide surface with the junction of second guide surface.

In an alternative embodiment of the present application, the guide member is sleeved on the fixing member.

In an alternative embodiment of the present application, the fixing member is one of a drop type and a streamline type.

In this application optional embodiment, the casing includes first apron and second apron, first apron with the second apron is connected and is formed the holding chamber, the gas outlet sets up first apron with the junction of second apron, the mounting is connected first apron with the second apron, and be close to the gas outlet sets up.

In an optional embodiment of the present application, the supporting member and the air flow direction are arranged at an included angle, and the guiding member is connected with the supporting member and is arranged at an included angle with the supporting member, so that the guiding member faces the air flow direction of the air outlet.

In an alternative embodiment of the present application, the support member is provided with a fixing hole, and the flow guiding member is installed in the fixing hole.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural diagram of an air knife according to an embodiment of the present invention.

Fig. 2 shows a schematic structural diagram of a flow guide of an air knife according to an embodiment of the present invention.

Fig. 3 is a schematic diagram showing an airflow velocity distribution when the air knife according to the embodiment of the present invention has a water drop type structure.

Fig. 4 shows a schematic structural view of a flow guiding member of an air knife provided by an embodiment of the present invention disposed on a supporting member.

Fig. 5 shows a schematic diagram of airflow velocity distribution when the air knife guide member is a partition plate according to an embodiment of the present invention.

Reference numerals: 100-air knife, 110-shell, 112-accommodating cavity, 114-air outlet, 116-first cover plate, 118-second cover plate, 120-supporting piece, 122-fixing hole, 130-fixing piece, 140-guiding piece, 142-guiding section, 142 a-guiding point, 142 b-first guiding surface, 142 c-second guiding surface, 144-connecting section and 146-connecting hole.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the 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.

It should be noted that all the directional indicators in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

When the air knife of the related technology is used for hot dip coating production, the surface of the strip steel is easy to generate the situation of random local zinc layer thickening, and the reason is mainly because the air pressure blown out by the air knife is poor in uniformity and stability, so that the air pressure on the surface of the strip steel is uneven, and finally the defect of local zinc layer thickening is presented. The air knife provided by the embodiment of the application can improve the problems, and can improve the uniformity and stability of air pressure blown out by the air knife so as to improve the uniformity of a zinc layer on the surface of strip steel.

The present application is described below with reference to specific embodiments in conjunction with the accompanying drawings:

referring to fig. 1 and 2, the present embodiment provides an air knife 100, and the air knife 100 provided in the present embodiment can improve uniformity and stability of air pressure blown by the air knife 100, so as to improve uniformity of a zinc layer on a strip steel surface.

In the present embodiment, the air knife 100 includes:

a housing 110, the housing 110 having a receiving chamber 112, an air inlet and an air outlet 114, the air inlet and the air outlet 114 communicating;

the supporting piece 120, the supporting piece 120 is set up in holding the cavity 112, and set up between air inlet and air outlet 114;

a fixing member 130, the fixing member 130 being coupled to the housing 110 for adjusting an opening area of the air outlet 114;

the flow guiding element 140 is arranged in the accommodating cavity 112, is connected with at least one of the supporting element 120 and the fixing element 130, and is arranged towards the direction of the air outlet 114, so that the air in the accommodating cavity 112 can flow out of the air outlet 114.

The supporting member 120 is disposed in the accommodating cavity 112 and is connected to the housing 110, and mainly plays a role of supporting the housing 110 to form the accommodating cavity 112, so as to ensure the volume of the accommodating cavity 112, and enable more gas to be accommodated in the accommodating cavity 112.

The fixing member 130 is connected to the housing 110, and can adjust the opening area of the air outlet 114, that is, adjust the size of the air outlet 114, thereby adjusting the air outlet amount of the air outlet 114.

Since the fixing member 130 and the supporting member 120 provided in the accommodating chamber 112 are mostly cylindrical in structure, vortex street is easily formed when the gas passes through the fixing member 130 and the supporting member 120 to cause uneven gas flow velocity, and also affects the velocity and the gas outlet amount of the gas blown out from the gas outlet 114. A flow guide 140 disposed toward the gas outlet 114 is disposed on at least one of the fixing member 130 and the supporting member 120, so that the gas passing through the fixing member 130 or the supporting member 120 can flow toward the gas outlet 114 under the guide of the flow guide 140, to mitigate the vortex street of the gas caused by the fixing member 130 and the supporting member 120, thereby improving the uniformity and stability of the gas blown out from the gas outlet 114.

It is easy to understand that the flow guide 140 is provided on at least one of the supporting member 120 and the fixing member 130, and the flow guide 140 may be provided only on the supporting member 120, the flow guide 140 may be provided only on the fixing member 130, or the flow guide 140 may be provided on both the supporting member 120 and the fixing member 130.

In the present embodiment, the flow guiding element 140 is disposed along the airflow direction, where the airflow direction refers to the path of the air flowing from the air inlet to the air outlet 114 through the accommodating cavity 112, i.e. whether the flow guiding element 140 is disposed towards the air outlet 114. The flow guide 140 is disposed along the air flow direction, and when the air passes through the fixing member 130 or the supporting member 120, the flow guide 140 can enable the air to continue to move along the air flow direction, so as to reduce the vortex street of the air caused by the fixing member 130 and the supporting member 120, thereby improving the uniformity and stability of the air blown out from the air outlet 114.

In this embodiment, the housing 110 includes a first cover 116 and a second cover 118, where the first cover 116 and the second cover 118 are connected to form the accommodating cavity 112, the air outlet 114 is disposed at a connection position between the first cover 116 and the second cover 118, and the fixing member 130 is connected to the first cover 116 and the second cover 118 and disposed near the air outlet 114.

The accommodating chamber 112 of the housing 110 is surrounded by a first cover plate 116 and a second cover plate 118, the first cover plate 116 and the second cover plate 118 have a certain elasticity, the fixing members 130 are respectively connected with the first cover plate 116 and the second cover plate 118, and the opening area of the air outlet 114 can be adjusted through the fixing members 130. The fixing member 130 may be a bolt, and the opening area of the air outlet 114 is adjusted by tightening or loosening the bolt to adjust the air outlet amount of the air outlet 114.

Therefore, a certain included angle exists between the extending direction of the fixing member 130 and the air flow direction, even the vertical condition is reached, when the air flow passes through the fixing member 130, as the fixing member 130 is of a cylindrical structure, air can form vortex streets on the fixing member 130, so that the air flow speed is uneven, the fixing member 130 is provided with the flow guiding member 140 consistent with the air flow direction, when the air passes through the fixing member 130, the air can flow out along the extending direction of the flow guiding member 140, so that the air can continuously flow along the air flow direction, and the air can be blown out from the air outlet 114 quickly, thereby ensuring the speed and stability of the air blown out from the air outlet 114.

In this embodiment, the fixing member 130 is disposed at an angle with respect to the air flow direction, and the guiding member 140 is connected to the fixing member 130 and disposed at an angle with respect to the fixing member 130, so that the guiding member 140 is disposed toward the air flow direction of the air outlet 114.

Because mounting 130 is the contained angle setting with the air current direction, then guide 140 is the contained angle setting with mounting 130, makes guide 140 can set up along the air current direction, when gaseous through mounting 130, can flow along the extending direction of guide 140, makes gaseous can continue to flow along the air current direction, can blow out fast from gas outlet 114 to guarantee the speed and the stability of the gaseous that blows out from gas outlet 114.

In this embodiment, the flow guiding member 140 includes a flow guiding section 142 and a fixing section connected to each other, the fixing section is connected to the fixing member 130, and the flow guiding section 142 is disposed toward the air flow direction of the air outlet 114.

The fixed section is installed on the fixed part 130, and the guide section 142 is arranged along the air flow direction, when the air flow passes through the fixed part 130, under the guide of the guide section 142, the air can quickly flow to the air outlet 114, the loss of flow velocity is reduced, and the uniformity and the stability of the air blown out from the air outlet 114 are improved.

In this embodiment, the end of the guiding section 142 away from the fixed section has a guiding point 142a, and the guiding point 142a is disposed near the air outlet 114.

The flow guiding point 142a is the point of the flow guiding member 140 farthest from the axis of the fixing member 130 and closest to the air outlet 114, and the air passing through the fixing member 130 flows onto the flow guiding section 142 after passing through the fixing section, and finally leaves the whole flow guiding member 140 from the flow guiding point 142a and flows to the air outlet 114, so that the air can flow to the air outlet 114 in a concentrated manner.

In this embodiment, the flow guiding section 142 includes a first flow guiding surface 142b and a second flow guiding surface 142c, one end of the first flow guiding surface 142b is connected with the fixed section, the other end is connected with the second flow guiding surface 142c, one end of the second flow guiding surface far away from the first flow guiding surface 142b is connected with one end of the connecting section 144 far away from the first flow guiding surface 142b, and the flow guiding point 142a is disposed at the connection position of the first flow guiding surface 142b and the second flow guiding surface 142 c.

The first guide surface 142b and the second guide surface 142c extend from the fixed section to the guide point 142a, so that the first guide surface 142b and the second guide surface 142c are obliquely arranged in directions close to each other, and when the air flow passes through the fixed section, the air flow can flow along the first guide surface 142b and the second guide surface 142c along the trend of the first guide surface 142b and the trend of the second guide surface 142c, and are separated from the guide point 142a, and finally blown out from the air outlet 114.

That is, the first guide surface 142b and the second guide surface 142c are not parallel, and are disposed in a direction approaching each other, and the first guide surface 142b and the second guide surface 142c may be planar or curved.

Referring to fig. 3 and 4, in the present embodiment, the guiding element 140 is sleeved on the fixing element 130. I.e., the fixed section is sleeved on the fixed member 130, the fixed section is fixedly connected with the fixed member 130, and the diversion section 142 is arranged along the air flow direction,

in this embodiment, the fixing member 130 is one of a drop type and a streamline type.

In this embodiment, the supporting member 120 is disposed at an angle with respect to the air flow direction, and the guiding member 140 is connected to the supporting member 120 and disposed at an angle with respect to the supporting member 120, so that the guiding member 140 is disposed toward the air flow direction of the air outlet 114.

Similarly, the supporting element 120 is disposed in the accommodating cavity 112 and is connected with the first cover plate 116 and the second cover plate 118, and is mainly used for supporting the first cover plate 116 and the second cover plate 118, so as to support the accommodating cavity 112, the extending direction of the supporting element 120 and the air flow direction have a certain included angle, and even can be mutually perpendicular, vortex streets can be generated when the air flow passes through the supporting element 120, and the guiding element 140 is also disposed on the supporting element 120 to guide the air, so that the uniformity and stability of the air are ensured.

Referring to fig. 5, in the present embodiment, the supporting member 120 is provided with a fixing hole 122, and the guiding member 140 is installed in the fixing hole 122. Fixedly mounting the flow guide 140 on the support 120 can reduce the risk of the flow guide 140 and the support 120 falling off.

When the deflector 140 is mounted on the support 120, the deflector 140 may be a partition plate.

In summary, since the fixing member 130 and the supporting member 120 disposed in the accommodating cavity 112 are mostly cylindrical, the air knife 100 provided in the present embodiment easily forms vortex street when the air passes through the fixing member 130 and the supporting member 120, which results in uneven air flow velocity, and affects the velocity and the air output of the air blown out from the air outlet 114. A flow guide 140 disposed toward the gas outlet 114 is disposed on at least one of the fixing member 130 and the supporting member 120, so that the gas passing through the fixing member 130 or the supporting member 120 can flow toward the gas outlet 114 under the guide of the flow guide 140, to mitigate the vortex street of the gas caused by the fixing member 130 and the supporting member 120, thereby improving the uniformity and stability of the gas blown out from the gas outlet 114.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

Claims

1. An air knife, characterized in that the air knife comprises:

the flow guide piece is arranged in the accommodating cavity;

the fixing piece is arranged at an included angle with the air flow direction, and the flow guiding piece is connected with the fixing piece and is arranged at an included angle with the fixing piece, so that the flow guiding piece is arranged towards the air flow direction of the air outlet;

and/or

The supporting piece is arranged at an included angle with the air flow direction, and the flow guiding piece is connected with the supporting piece and is arranged at an included angle with the supporting piece, so that the flow guiding piece is arranged towards the air flow direction of the air outlet;

the air flow direction refers to a path of air flowing from the air inlet to the air outlet through the accommodating cavity.

2. The air knife of claim 1, wherein the fixing member is disposed at an angle to the air flow direction, and the flow guiding member is connected to the fixing member and disposed at an angle to the fixing member such that the flow guiding member is disposed toward the air flow direction of the air outlet.

3. The air knife of claim 2, wherein the flow guide member comprises a flow guide section and a fixed section that are connected to each other, the fixed section being connected to the fixed member, the flow guide section being disposed toward the air flow direction of the air outlet.

4. The air knife of claim 3, wherein an end of the flow guiding section remote from the fixed section has a flow guiding point, the flow guiding point being disposed proximate to the air outlet.

5. The air knife of claim 4, wherein the flow guiding section comprises a first flow guiding surface and a second flow guiding surface, one end of the first flow guiding surface is connected with the fixed section, the other end of the first flow guiding surface is connected with the second flow guiding surface, one end of the second flow guiding surface away from the first flow guiding surface is connected with one end of the fixed section away from the first flow guiding surface, and the flow guiding point is arranged at the joint of the first flow guiding surface and the second flow guiding surface.

6. The air knife of claim 1, wherein the guide member is sleeved on the fixing member.

7. The air knife of claim 1, wherein the securing member is one of drop-shaped and streamlined.

8. The air knife of any one of claims 1-7, wherein the housing comprises a first cover plate and a second cover plate, the first cover plate and the second cover plate are connected to form the accommodating cavity, the air outlet is arranged at the joint of the first cover plate and the second cover plate, and the fixing piece is connected with the first cover plate and the second cover plate and is arranged close to the air outlet.

9. The air knife of claim 1, wherein the support member is provided with a securing hole, and the deflector is mounted in the securing hole.