CN115478240A

CN115478240A - Air knife

Info

Publication number: CN115478240A
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: 2022-12-16
Anticipated expiration: 2042-08-30
Also published as: CN115478240B

Abstract

The application discloses an air knife belongs to hot-dip coating technology technical field to solve the technical problem that the air knife at present gives vent to anger unevenly unstably. The air knife includes: the shell is provided with an accommodating 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 is arranged 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 flow guide piece is arranged in the accommodating cavity, is connected with at least one of the support piece and the fixing piece and is arranged towards the direction of the gas outlet, so that gas in the accommodating cavity can flow out of the gas outlet. The guide piece arranged towards the gas outlet is arranged on at least one of the fixing piece and the supporting piece, so that gas passing through the fixing piece or the supporting piece can flow to the gas outlet under the guide of the guide piece, the gas vortex street caused by the fixing piece and the supporting piece is reduced, and the uniformity and the stability of the gas blown out from the gas 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 important process equipment for hot galvanizing production, and has important influence on the quality of hot galvanizing products. In a continuous hot galvanizing production line, a pair of slit-shaped nozzles which cross the width of the whole strip steel are adopted to jet out continuous flat airflow like a knife, so that 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 flows back to a zinc pot, thereby achieving the purpose of reasonably controlling a hot galvanizing zinc layer. The larger the air pressure blown out by the air knife is, the stronger the zinc scraping capability of the air knife is, and the smaller the thickness of the zinc layer on the surface of the strip steel is. The hot galvanizing product has strong correlation with surface quality defects of an air knife, and the air knife airflow needs to have very good stability and uniformity, otherwise, hot galvanizing surface defects are generated.

When the air knife in the related technology is used for hot-dip production, the situation of random local zinc layer thickening is easily generated on the surface of the strip steel, and the reason is mainly that the air pressure uniformity and stability of the air blown out by the air knife are poor, so that the air pressure on the surface of the strip steel is uneven, and the defect of local zinc layer thickening is finally shown.

Disclosure of Invention

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

In a first aspect, an embodiment of the present application provides an air knife, including:

the air inlet is communicated with the air outlet;

a support member disposed in the accommodation chamber 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 guide piece is arranged in the accommodating cavity, is connected with at least one of the support piece and the fixing piece and faces the direction of the gas outlet, so that gas in the accommodating cavity can flow out of the gas outlet.

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

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

In the optional embodiment of this application, the water conservancy diversion spare includes interconnect's water conservancy diversion section and canned paragraph, the canned paragraph with the mounting is connected, the water conservancy diversion section sets up towards the air current direction of gas outlet.

In an optional embodiment of the present application, one end of the flow guiding section, which is far away from the fixing section, is provided with a flow guiding point, and the flow guiding point is arranged close to the air outlet.

In the optional embodiment of this application, the water conservancy diversion section includes first water conservancy diversion face and second water conservancy diversion face, the one end of first water conservancy diversion face with the canned paragraph is connected, the other end with the second water conservancy diversion face is connected, the second water conservancy diversion face keep away from the one end of first water conservancy diversion face with the one end that the first water conservancy diversion face was kept away from to the linkage segment is connected, the water conservancy diversion point sets up first water conservancy diversion face with the junction of second water conservancy diversion face.

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

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

In an optional embodiment of the present application, the housing includes a first cover plate and a second cover plate, the first cover plate and the second cover plate are connected to form the accommodating chamber, the air outlet is disposed at a joint of the first cover plate and the second cover plate, and the fixing member is connected to the first cover plate and the second cover plate and disposed close to the air outlet.

In the optional embodiment of this application, the supporting part with the air current direction is the contained angle setting, the water conservancy diversion spare with support piece connects, and with support piece is the contained angle setting, makes the water conservancy diversion spare orientation the air current direction setting of gas outlet.

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

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 illustrates a schematic structural view of an air knife provided in an embodiment of the present invention.

Fig. 2 illustrates a schematic structural view of a flow guide of an air knife provided in an embodiment of the present invention.

Fig. 3 is a schematic view illustrating the distribution of the air flow velocity when the flow guide of the air knife provided by the embodiment of the present invention is in a water droplet type structure.

Fig. 4 is a schematic view illustrating a structure in which a guide of an air knife provided by an embodiment of the present invention is disposed on a support.

Fig. 5 is a schematic view illustrating the distribution of the air velocity when the guide of the air knife provided by the embodiment of the present invention is a partition plate.

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

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement condition, etc. of the components in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The air knife is important process equipment for hot galvanizing production and has important influence on the quality of hot galvanizing products. In a continuous hot galvanizing production line, a pair of slit-shaped nozzles which cross the width of the whole strip steel are adopted to jet out continuous flat airflow like a knife, so that 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 flows back to a zinc pot, thereby achieving the purpose of reasonably controlling a hot galvanizing zinc layer. The larger the air pressure blown out by the air knife is, the stronger the zinc scraping capability of the air knife is, and the smaller the thickness of the zinc layer on the surface of the strip steel is. The hot galvanizing product has strong correlation with surface quality defects of an air knife, and the air knife airflow needs to have very good stability and uniformity, otherwise, hot galvanizing surface defects are generated.

When the air knife in the related technology is used for hot-dip production, the situation of random local zinc layer thickening is easy to occur on the surface of the strip steel, and the reason is mainly that the air pressure uniformity and stability of the air knife blown out are poor, so that the air pressure on the surface of the strip steel is uneven, and finally the defect of local zinc layer thickening is shown. 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 application is described below with reference to specific embodiments in conjunction with the following drawings:

referring to fig. 1 and fig. 2, the present embodiment provides an air knife 100, and the air knife 100 provided by 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 surface of a strip steel.

In the present embodiment, the air knife 100 includes:

a housing 110, wherein the housing 110 is provided with an accommodating cavity 112, an air inlet and an air outlet 114, and the air inlet and the air outlet 114 are communicated;

a support 120, the support 120 being disposed in the accommodating chamber 112 and between the air inlet and the air outlet 114;

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

the flow guide member 140 is disposed in the accommodating chamber 112, connected to at least one of the support member 120 and the fixing member 130, and disposed toward the gas outlet 114, so that the gas in the accommodating chamber 112 can flow out of the gas outlet 114.

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

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

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

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

In the present embodiment, the flow guiding element 140 is disposed along an airflow direction, wherein the airflow direction refers to a path of the air flowing from the air inlet to the air outlet 114 through the accommodating cavity 112, that is, the flow guiding element 140 is disposed toward the air outlet 114. The flow guide member 140 is disposed along the airflow direction, and when the gas passes through the fixing member 130 or the supporting member 120, the flow guide member 140 enables the gas to continue to move along the airflow direction, so as to reduce the gas vortex street 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 this embodiment, the housing 110 includes a first cover plate 116 and a second cover plate 118, the first cover plate 116 and the second cover plate 118 are connected to form the receiving cavity 112, the air outlet 114 is disposed at a joint of the first cover plate 116 and the second cover plate 118, and the fixing member 130 is connected to the first cover plate 116 and the second cover plate 118 and disposed near the air outlet 114.

The accommodating cavity 112 of the housing 110 is enclosed by the first cover plate 116 and the second cover plate 118, the first cover plate 116 and the second cover plate 118 have certain elasticity, the fixing member 130 is 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 by the fixing member 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 output of the air outlet 114.

Therefore, a certain included angle exists between the extending direction of the fixing member 130 and the airflow direction, even the included angle is vertical, when the airflow passes through the fixing member 130, because the fixing member 130 is of a cylindrical structure, the gas can form a vortex street on the fixing member 130, which causes uneven airflow speed, the flow guide member 140 which is consistent with the airflow direction is arranged on the fixing member 130, when the gas passes through the fixing member 130, the gas can flow out along the extending direction of the flow guide member 140, so that the gas can continuously flow along the airflow direction, and can be blown out from the air outlet 114 quickly, thereby ensuring the speed and stability of the gas blown out from the air outlet 114.

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

Because the fixing piece 130 is arranged at an included angle with the airflow direction, the flow guide piece 140 is arranged at an included angle with the fixing piece 130, so that the flow guide piece 140 can be arranged along the airflow direction, when the gas passes through the fixing piece 130, the gas can flow out along the extending direction of the flow guide piece 140, the gas can continue to flow along the airflow direction, and the gas can be blown out from the gas outlet 114 quickly, thereby ensuring the speed and stability of the gas blown out from the gas outlet 114.

In this embodiment, the flow guiding element 140 includes a flow guiding section 142 and a fixing section connected to each other, the fixing section is connected to the fixing element 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 mounting 130, and water conservancy diversion section 142 sets up along the air current direction, and when the air current during through mounting 130, under the water conservancy diversion of water conservancy diversion section 142, gas can flow to gas outlet 114 fast, reduces the loss of velocity of flow, improves the homogeneity and the stability of the gas that blows off from gas outlet 114.

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

The flow guide point 142a is a point on the flow guide element 140 farthest from the axis of the fixing element 130 and closest to the gas outlet 114, and the gas passing through the fixing element 130 flows onto the flow guide section 142 after passing through the fixing section, and finally separates from the whole flow guide element 140 from the flow guide point 142a and flows to the gas outlet 114, so that the gas can flow to the gas 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 to the fixing section, the other end is connected to the second flow guiding surface 142c, one end of the second flow guiding surface far from the first flow guiding surface 142b is connected to one end of the connecting section 144 far from the first flow guiding surface 142b, and the flow guiding point 142a is disposed at the connection between the first flow guiding surface 142b and the second flow guiding surface 142 c.

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

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

Referring to fig. 3 and 4, in the present embodiment, the flow guiding element 140 is disposed on the fixing element 130. Namely, the fixing section is sleeved on the fixing member 130, the fixing section is fixedly connected with the fixing member 130, and the flow guide section 142 is arranged along the airflow direction,

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

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

Similarly, support member 120 sets up in holding chamber 112, be connected with first apron 116 and second apron 118 respectively, mainly used plays to support first apron 116 and second apron 118 to hold holding chamber 112, support member 120's extending direction and air current direction have certain contained angle, can reach mutually perpendicular even, can produce the vortex street when the air current passes through support member 120 equally, it can play the guide effect to gas also to set up guide member 140 on support member 120, guarantee gaseous homogeneity and stability.

Referring to fig. 5, in the present embodiment, a fixing hole 122 is formed on the supporting member 120, and the flow guide member 140 is installed in the fixing hole 122. The flow guide member 140 is fixedly mounted on the support member 120, so that the risk of falling off of the flow guide member 140 and the support member 120 can be reduced.

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

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

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Claims

1. An air knife, comprising:

the air inlet is communicated with the air outlet;

2. The air knife of claim 1, wherein the fixture is angled with respect to the direction of the air flow, and the flow guide is coupled to the fixture and angled with respect to the fixture such that the flow guide is oriented in the direction of the air flow from the air outlet.

3. The air knife of claim 2, wherein the flow guide member comprises a flow guide section and a fixing section connected to each other, the fixing section being connected to the fixing 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 guide section distal from the stationary section has a flow guide point disposed proximate to the air outlet.

5. The air knife of claim 4, wherein the flow guide section comprises a first flow guide surface and a second flow guide surface, one end of the first flow guide surface is connected with the fixed section, the other end of the first flow guide surface is connected with the second flow guide surface, one end of the second flow guide surface, which is far away from the first flow guide surface, is connected with one end of the connecting section, which is far away from the first flow guide surface, and the flow guide point is arranged at the connection position of the first flow guide surface and the second flow guide surface.

6. An air knife according to claim 1, wherein the flow guide is sleeved on the fixing member.

7. An air knife according to claim 1, wherein the fixture is one of drop-shaped and streamlined.

8. The air knife of any one of claims 1-7, wherein the housing includes a first cover plate and a second cover plate, the first cover plate and the second cover plate are connected to form the receiving cavity, the air outlet is disposed at a connection of the first cover plate and the second cover plate, and the fixing member is connected to the first cover plate and the second cover plate and disposed adjacent to the air outlet.

9. The air knife of claim 1, wherein the support member is angled with respect to the direction of the air flow, and the flow guide member is coupled to the support member and angled with respect to the support member such that the flow guide member is oriented in the direction of the air flow from the air outlet.

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