Powder diffusion spraying device for inner wall of pipe

Abstract

The utility model discloses a powder diffusion spraying device for the inner wall of a pipe, and relates to the technical field of powder spraying, the device comprises a self-rotating powder diffusion spray head, a limiting assembly and a flow guide cone, the self-rotating powder diffusion spray head comprises a spray head body, a plurality of self-rotating blades and a plurality of auxiliary diffusion blades, the multiple self-rotating type blades and the multiple auxiliary diffusion blades are arranged on the spray head body side by side at intervals, each auxiliary diffusion blade is arranged between two self-rotating type blades, and the length of each auxiliary diffusion blade is half or two thirds of the length of each self-rotating type blade. The self-rotating type blades and the auxiliary diffusion blades are continuous curved surfaces which are gradually bent in the direction deviating from the preset rotating direction. The limiting assembly comprises a limiting shaft and a first fastener; the first fastening piece, the spray head body and the flow guide cone are sequentially arranged on the limiting shaft in a sleeving mode. The thickness uniformity value of the coating on the inner wall of the pipe during powder spraying operation can be effectively improved, and the overall spraying quality of the inner wall of the pipe is improved.

Description

Technical Field

[0001] The present application relates to the technical field of powder spraying, and in particular to a device for spraying powder on the inner wall of a pipe. Background Art

[0002] Hot-melt powder coatings are widely used in the anti-corrosion treatment of special oil pipes, and have good insulation, anti-corrosion and anti-waxing properties. Since China introduced the internal anti-corrosion technology of special oil pipes in the 1990s, all kinds of drill pipes and oil casings will be treated with anti-corrosion internal coatings before use. In order to ensure the continuity of the anti-corrosion coating, all kinds of short-section drill pipes and oil casing couplings need to be sprayed with anti-corrosion. At present, when the industry handles the powder spraying operation on the inner wall of this type of annular pipe fittings, the traditional powder spray head is inserted into the inner cavity of the pipe fitting, and the coating is sprayed on the inner wall of the pipe fitting through multiple spray holes opened on the spray head. However, the spraying efficiency of the spray head of this type of equipment is low, and the uniformity of the spraying is relatively poor, resulting in different thicknesses of the powder sprayed on the inner wall of the pipe. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a tube inner wall powder diffusion spraying device, which can evenly diffuse powder on the surface of the inner wall of the tube, effectively improve the thickness uniformity of the tube inner wall coating during the powder spraying operation, thereby improving the overall spraying quality of the tube inner wall.

[0004] The present application provides a tube inner wall powder diffusion spraying device, comprising:

[0005] A self-spinning powder diffusion nozzle, the self-spinning powder diffusion nozzle comprising a nozzle body, a plurality of self-spinning blades and a plurality of auxiliary diffusion blades, the plurality of self-spinning blades and the plurality of auxiliary diffusion blades are arranged side by side and spaced apart on the nozzle body, and each of the auxiliary diffusion blades is arranged between two self-spinning blades, the length of the auxiliary diffusion blade is half or two-thirds of the length of the self-spinning blade, the self-spinning blade and the auxiliary diffusion blade are both continuous curved surfaces that are gradually bent away from a preset rotation direction, and an arc-shaped channel is formed between the self-spinning blade and the adjacent auxiliary diffusion blade;

[0006] A limiting assembly, the limiting assembly comprising a limiting shaft and a first fastener;

[0007] A guide cone, the first fastener, the nozzle body and the guide cone are sequentially sleeved on the limiting shaft.

[0008] According to the tube inner wall powder diffusion spraying device of the embodiment of the present application, at least the following beneficial effects are achieved: the powder is sprayed from the powder injection tube to the tube inner wall powder diffusion spraying device, the powder flows to the self-spinning powder diffusion nozzle after being guided by the guide cone, and when the powder is sprayed from the injection tube, the high-speed airflow entrains the powder and acts on multiple self-spinning blades and multiple auxiliary diffusion blades to make the self-spinning blades rotate, and the self-spinning blades and auxiliary diffusion blades in the rotating state will simultaneously generate axial and radial diffusion forces when rotating, so that the powder can act on the surface of the tube inner wall in a uniform diffusion manner. Through this setting, the present application can act on the surface of the tube inner wall in a uniform diffusion manner, effectively improving the thickness uniformity of the tube inner wall coating during the powder spraying operation, thereby improving the overall spraying quality of the tube inner wall.

[0009] According to some embodiments of the present application, the continuous curved surface is an arc curved surface.

[0010] According to some embodiments of the present application, an axial hole is opened in the nozzle body along the axial direction, and the limiting shaft passes through the axial hole and is arranged in the nozzle body.

[0011] According to some embodiments of the present application, the powder diffusion spraying device on the inner wall of the pipe also includes a powder injection tube connector, and the powder injection tube connector includes an internal connector and an external connector. The interior of the external connector is hollow, and the internal connector is arranged inside the external connector, and the internal connector is fixedly connected to one end of the external connector, and a plurality of strip-shaped through holes are provided at the connection between the internal connector and the external connector, and the internal connector is sleeved on the limiting shaft, and the internal connector is arranged between the nozzle body and the guide cone.

[0012] According to some embodiments of the present application, the tube inner wall powder diffusion spraying device also includes a second fastener, the second fastener is sleeved on the limiting shaft, and the second fastener is arranged between the internal connecting piece and the guide cone.

[0013] According to some embodiments of the present application, a threaded connection portion is provided on the outside of one end of the external connector away from the internal connector, and the external connector is used for threaded connection with an external powder injection pipe through the threaded connection portion.

[0014] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 A schematic side view of a calibration tool installed on a spin-type powder diffusion nozzle according to an embodiment of the present application;

[0017] Figure 2 A schematic top view of a calibration tool installed on a spin-type powder diffusion nozzle according to an embodiment of the present application;

[0018] Figure 3 A schematic diagram of the main structure of a tube inner wall powder diffusion spraying device provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of a tube inner wall powder diffusion spraying device provided in an embodiment of the present application from a rear view.

[0020] Reference numerals:

[0021] A self-spinning powder diffusion nozzle 110, a nozzle body 111, a self-spinning blade 112, an auxiliary diffusion blade 113, an arc channel 114, and an axial hole 115;

[0022] A first fastener 121 , a guide cone 122 , and an external connector 123 . DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0024] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0027] Hot-melt powder coatings are widely used in the anti-corrosion treatment of special oil pipes, and have good insulation, anti-corrosion and anti-waxing properties. Since China introduced the internal anti-corrosion technology of special oil pipes in the 1990s, all kinds of drill pipes and oil casings will be treated with anti-corrosion internal coatings before use. In order to ensure the continuity of the anti-corrosion coating, all kinds of short-section drill pipes and oil casing couplings need to be sprayed with anti-corrosion. At present, when the industry handles the powder spraying operation on the inner wall of this type of annular pipe fittings, the traditional powder spray head is inserted into the inner cavity of the pipe fitting, and the coating is sprayed on the inner wall of the pipe fitting through multiple spray holes opened on the spray head. However, the spraying efficiency of the spray head of this type of equipment is low, and the uniformity of the spraying is relatively poor, resulting in different thicknesses of the powder sprayed on the inner wall of the pipe.

[0028] In order to solve the above-mentioned problems, the present application proposes a tube inner wall powder diffusion spraying device. The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0029] Reference Figures 1 to 4 The present application provides a tube inner wall powder diffusion spraying device, comprising: a self-spinning powder diffusion nozzle 110, a limiting assembly and a guide cone 122; the self-spinning powder diffusion nozzle 110 comprises a nozzle body 111, a plurality of self-spinning blades 112 and a plurality of auxiliary diffusion blades 113, the plurality of self-spinning blades 112 and the plurality of auxiliary diffusion blades 113 are arranged side by side and at intervals on the nozzle body 111, and each auxiliary diffusion blade 113 is arranged between two self-spinning blades 112, the length of the auxiliary diffusion blade 113 is half or two-thirds of the length of the self-spinning blade 112, the self-spinning blade 112 and the auxiliary diffusion blade 113 are both continuous curved surfaces that gradually bend away from a preset rotation direction, and an arc channel 114 is formed between the self-spinning blade 112 and the adjacent auxiliary diffusion blade 113; the limiting assembly comprises a limiting shaft and a first fastener 121; the first fastener 121, the nozzle body 111 and the guide cone 122 are sequentially sleeved on the limiting shaft.

[0030] In the present embodiment, six self-spinning blades 112 and auxiliary diffusion blades 113 are provided, and the length of the auxiliary diffusion blades 113 is half the length of the self-spinning blades 112, and the self-spinning blades 112 and the auxiliary diffusion blades 113 are interlaced to avoid the powder being dispersed to a low degree by the six long self-spinning blades 112. The auxiliary diffusion blades 113 are interlaced in the six long self-spinning blades 112 to increase the degree of powder dispersion, so that the powder can be sprayed onto the inner wall of the pipe more evenly. In some embodiments, the self-spinning blades 112 and the auxiliary diffusion blades 113 can also be provided in other numbers, and the length of the auxiliary diffusion blades 113 can also be two-thirds of the length of the self-spinning blades 112, and are not limited to the embodiments of the present application.

[0031] It should be noted that not only multiple spinning blades 112 are provided, but multiple auxiliary diffusion blades 113 are interspersed to avoid providing only spinning blades 112, which would result in excessive gravity of the spinning powder diffusion nozzle 110, reduce the spinning efficiency of the spinning blades 112, and further reduce the degree of powder dispersion.

[0032] In this embodiment, the spinning blades 112 are connected from one end of the nozzle body 111 to the other end of the nozzle body 111 , and the auxiliary diffusion blades 113 are connected from the half or one third of the spinning blades 112 to the other end of the nozzle body 111 .

[0033] In the present application, the powder is sprayed from the powder spraying tube to the powder diffusion spraying device on the inner wall of the pipe. The powder is guided by the guide cone 122 and then flows to the self-spinning powder diffusion nozzle 110. When the powder is sprayed from the spraying tube, the high-speed airflow entrains the powder and acts on multiple self-spinning blades 112 and multiple auxiliary diffusion blades 113 to make the self-spinning blades 112 rotate. The self-spinning blades 112 and the auxiliary diffusion blades 113 in the rotating state will simultaneously generate axial and radial diffusion forces when rotating, so that the powder can act on the surface of the inner wall of the pipe in a uniform diffusion manner. Through this setting, the present application can act on the surface of the inner wall of the pipe in a uniform diffusion manner, effectively improving the thickness uniformity of the inner wall coating of the pipe during the powder spraying operation, thereby improving the overall spraying quality of the inner wall of the pipe.

[0034] It can be understood that the continuous curved surface is an arc curved surface.

[0035] It should be noted that the continuous curved surfaces of the spinning blades 112 and the auxiliary diffusion blades 113 that are gradually bent away from the preset rotation direction are both set as arc curved surfaces, so that an arc channel 114 is formed between the spinning blades 112 and the adjacent auxiliary diffusion blades 113, so that when the high-speed airflow carried by the powder when it is ejected from the injection tube flows through the arc channel 114, it will exert a force on the spinning blades 112 to push the spinning blades 112.

[0036] Reference Figure 1 to Figure 2 It can be understood that the nozzle body 111 is provided with an axial hole 115 along the axial direction, and the limiting shaft is passed through the axial hole 115 and is disposed in the nozzle body 111 .

[0037] It should be noted that, by providing the limiting axis, the nozzle body 111 and the spinning blades 112 and the auxiliary diffusion blades 113 on the nozzle body 111 can rotate around the limiting axis during rotation.

[0038] Reference Figure 3 to Figure 4It can be understood that the powder diffusion spraying device for the inner wall of the pipe also includes a powder injection tube connector, which includes an internal connector and an external connector 123. The interior of the external connector 123 is hollow, and the internal connector is arranged inside the external connector 123, and the internal connector is fixedly connected to one end of the external connector 123, and a plurality of strip-shaped through holes are provided at the connection between the internal connector and the external connector 123, the internal connector is sleeved on the limit shaft, and the internal connector is arranged between the nozzle body 111 and the guide cone 122.

[0039] It should be noted that a plurality of strip-shaped through holes are provided at the connection between the internal connector and the external connector 123, so that the high-speed airflow sprayed from the powder injection tube to the external connector 123 and the powder entrained in the high-speed airflow can flow to the spin-type powder diffusion nozzle 110 through the plurality of strip-shaped through holes.

[0040] It is understandable that the tube inner wall powder diffusion spraying device further includes a second fastener, the second fastener is sleeved on the limiting shaft, and the second fastener is arranged between the internal connecting piece and the guide cone 122 .

[0041] In this embodiment, the first fastener 121 and the second fastener are both screw fasteners.

[0042] It can be understood that a threaded connection portion is provided on the outside of one end of the external connection member 123 away from the internal connection member, and the external connection member 123 is used for threaded connection with an external powder spraying pipe through the threaded connection portion.

[0043] It should be noted that by providing the internal connector and the external connector 123 in the powder injection pipe connector, the connection between the powder injection pipe and the spin-type powder diffusion nozzle 110 can be achieved through the powder injection pipe connector.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0045] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0046] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A tube inner wall powder diffusion spraying device, characterized in that: include: A self-spinning powder diffusion nozzle, the self-spinning powder diffusion nozzle comprising a nozzle body, a plurality of self-spinning blades and a plurality of auxiliary diffusion blades, the plurality of self-spinning blades and the plurality of auxiliary diffusion blades are arranged side by side and spaced apart on the nozzle body, and each of the auxiliary diffusion blades is arranged between two self-spinning blades, the length of the auxiliary diffusion blade is half or two-thirds of the length of the self-spinning blade, the self-spinning blade and the auxiliary diffusion blade are both continuous curved surfaces that are gradually bent away from a preset rotation direction, and an arc-shaped channel is formed between the self-spinning blade and the adjacent auxiliary diffusion blade; A limiting assembly, the limiting assembly comprising a limiting shaft and a first fastener; A guide cone, the first fastener, the nozzle body and the guide cone are sequentially sleeved on the limiting shaft.

2. The tube inner wall powder diffusion spraying device according to claim 1 is characterized in that: The continuous curved surface is an arc curved surface.

3. The tube inner wall powder diffusion spraying device according to claim 1 is characterized in that: The nozzle body is provided with an axial hole along the axial direction, and the limiting shaft is passed through the axial hole and is arranged in the nozzle body.

4. The tube inner wall powder diffusion spraying device according to claim 1, characterized in that: The powder diffusion spraying device for the inner wall of the pipe also includes a powder injection tube connector, which includes an internal connector and an external connector. The interior of the external connector is hollow, and the internal connector is arranged inside the external connector, and the internal connector is fixedly connected to one end of the external connector, and a plurality of strip-shaped through holes are provided at the connection between the internal connector and the external connector, and the internal connector is sleeved on the limiting shaft, and the internal connector is arranged between the nozzle body and the guide cone.

5. The tube inner wall powder diffusion spraying device according to claim 4 is characterized in that: The tube inner wall powder diffusion spraying device also includes a second fastener, which is sleeved on the limiting shaft and arranged between the internal connecting piece and the guide cone.

6. The tube inner wall powder diffusion spraying device according to claim 4, characterized in that: A threaded connection portion is provided on the outside of one end of the external connection member away from the internal connection member, and the external connection member is used for threaded connection with an external powder spraying pipe through the threaded connection portion.

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