Powder sprayer

Abstract

The utility model provides a powder sprayer, which belongs to the technical field of powder spraying equipment and comprises a base, an overflowing hole is arranged in the middle of the base, a conical reaming section is arranged at the front end of the overflowing hole, a flow guide block is arranged at the front end of the conical reaming section, and the flow guide block comprises a first block body and a second block body which are connected with each other. The first block body is partially inserted into the conical reaming section, a jet gap is formed between the first block body and the conical reaming section, the first block body is a conical body, and a flow guide cambered surface bent inwards is formed on the periphery of the first block body. According to the powder sprayer, the included angle between the spraying direction of the powder coating and the axis of a pipe is increased, so that the component velocity of the powder coating in the axis direction of the pipe is reduced, most of the powder coating can act on the inner wall of the pipe, and waste of the powder coating is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of powder spraying equipment, and more specifically relates to a powder spray head. Background Art

[0002] At present, in the field of internal coating and corrosion protection of oil pipelines, powder coating has a tendency to gradually replace liquid coating due to its excellent characteristics such as environmental protection, safety, and low volatile gas. In particular, the demand for powder coating in oil pipelines is increasing. When powder spraying the inner wall of special oil pipes, a 15-meter-long spray gun is usually used to penetrate into the interior of the pipe. Then, as the spray gun retreats, the powder coating is ejected at the front end of the spray gun under the push of compressed air to form a powder coating on the inner wall of the pipe. The Chinese invention patent application document with patent number 200910175444.8 and the name "Powder Coating Spray Gun" records a conical nozzle, such as Figure 1 As shown, the conical nozzle includes a base, a conical groove is provided at the front end of the base, a guide block is connected in the conical groove, the guide block is conical at one end facing the conical groove, and a jet channel is formed by the gap between the guide block and the base, and the outlet direction of the jet channel has a certain angle with the axial direction of the pipe, so that the powder coating can fall on the inner wall of the pipe after being sprayed. However, in actual application, after the powder coating is sprayed through the jet channel, it will have a large component velocity along the axial direction of the pipe, so that part of the powder coating will be ejected to the front of the conical nozzle after being sprayed and cannot act on the inner wall of the pipe, thereby causing a waste of powder coating. Utility Model Content

[0003] The utility model aims to provide a powder spray head, aiming to solve the problem of much waste of powder coating in the process of spraying operation using the existing conical spray head.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a powder nozzle, including a base, a flow hole is provided in the middle of the base, a conical reaming section is provided at the front end of the flow hole, a guide block is provided at the front end of the conical reaming section, the guide block includes a first block and a second block connected to each other, the first block is partially inserted in the conical reaming section, and there is a spraying gap between the first block and the conical reaming section, the first block is a cone, and the outer periphery of the first block forms an inwardly curved guide arc surface.

[0005] In a possible implementation, the radian of the guide cambered surface is between π / 4 and π / 3 rad.

[0006] In a possible implementation manner, the first block and the second block are symmetrically arranged.

[0007] In a possible implementation, the first block is coaxially arranged with the conical hole expansion section, and the first block is connected to the conical hole expansion section via a connecting rod.

[0008] In a possible implementation, a mounting section is provided at the rear end of the flow hole, and the mounting section is used to be installed on a spray gun. A connecting section is provided between the mounting section and the conical expansion section.

[0009] In a possible implementation, the cross-sectional area of ​​the connecting section decreases gradually from the assembly section to the conical expansion section.

[0010] In a possible implementation, one end of the connecting rod is welded and fixed to the first block, and the other end of the connecting rod is inserted into the conical reaming section.

[0011] In a possible implementation, a first mounting hole is provided on the side wall of the conical expansion section along its axial direction, and the connecting rod is slidably inserted into the first mounting hole.

[0012] In a possible implementation, a second mounting hole is radially opened on the side wall of the base, the second mounting hole is connected to the first mounting hole, a push rod is threadedly connected to the second mounting hole, and the push rod abuts against the connecting rod to limit the movement of the connecting rod.

[0013] In a possible implementation, the diameter of the connecting rod is no greater than 3 mm.

[0014] The beneficial effect of a powder spray nozzle provided by the utility model is that: compared with the prior art, the powder spray nozzle of the utility model forms an inwardly curved guide arc surface on the outer periphery of the first block. When in use, the powder coating is sprayed along the tangent direction of the end of the guide block on the first block under the guidance of the guide arc surface of the first block, thereby increasing the angle between the spraying direction of the powder coating and the axis of the pipe, thereby reducing the component velocity of the powder coating along the axis direction of the pipe, and then most of the powder coating can act on the inner wall of the pipe, thereby reducing the waste of powder coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the operating state of the prior art nozzle;

[0017] Figure 2 A schematic diagram of the three-dimensional structure of a powder spray head provided in an embodiment of the utility model;

[0018] Figure 3 A schematic cross-sectional structure diagram of a base of a powder spray head provided in an embodiment of the utility model;

[0019] Figure 4 A schematic cross-sectional view of a guide block for a powder spray head provided in an embodiment of the utility model

[0020] Figure 5 A schematic diagram of the operating state of a powder spray nozzle provided in an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1. Base; 101. Injection gap; 2. Flow hole; 21. Conical expansion section; 22. Assembly section; 23. Connection section; 3. Guide block; 31. First block; 32. Second block; 4. Connecting rod; 5. First mounting hole; 6. Second mounting hole; 7. Top rod. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] See also Figures 2 to 5 Now, a powder spray head provided by the utility model is described. The powder spray head comprises a base 1, a flow hole 2 is provided in the middle of the base 1, a conical expansion section 21 is provided at the front end of the flow hole 2, a guide block 3 is provided at the front end of the conical expansion section 21, the guide block 3 comprises a first block 31 and a second block 32 connected to each other, the first block 31 is partially inserted in the conical expansion section 21, a spray gap 101 is provided between the first block 31 and the conical expansion section 21, the first block 31 is a conical body, and the outer periphery of the first block 31 forms a guide arc surface that bends inward.

[0028] Compared with the prior art, the utility model provides a powder spray nozzle. By forming an inwardly curved guide arc surface on the outer periphery of the first block 31, when in use, the powder coating is sprayed along the tangent direction of the end of the guide arc surface on the first block 31 under the guidance of the guide arc surface of the first block 31, thereby increasing the angle between the spraying direction of the powder coating and the axis of the pipe, thereby reducing the component velocity of the powder coating along the axis direction of the pipe, and then most of the powder coating can act on the inner wall of the pipe, thereby reducing the waste of powder coating.

[0029] In some embodiments, see Figure 2 , Figure 4 , Figure 5 The second block 32 has the same structure as the first block 31, and the first block 31 and the second block 32 are symmetrically arranged. Optionally, the first block 31 and the second block 32 are integrally formed. By setting the second block 32 to the same structure as the first block 31, during operation, when some powder coating drips on the second block 32, the side wall of the second block 32 bends inward to form a guide arc surface, thereby making the powder coating droplets slide along the guide arc surface of the second block 32. The sliding speed of the powder coating droplets can be effectively reduced to prevent them from dripping on the powder coating on the inner wall of the pipe to form a dripping defect.

[0030] In some embodiments, see Figure 2 , Figure 3 , Figure 5The base 1 can be formed by turning a stainless steel round bar. The flow hole 2 in the middle of the base 1 includes a tapered expansion section 21 located at the front end thereof, an assembly section 22 located at the rear end thereof, and a connecting section 23 connecting the tapered expansion section 21 and the assembly section 22, wherein the assembly section 22 is used to assemble the base 1 to the spray gun, and the cross-section of the connecting section 23 decreases from the side of the assembly section 22 to the side of the tapered expansion section 21. In this way, the feed port diameter of the connecting section 23 is large and the discharge port diameter is small. When the powder coating flows through the connecting section 23, it is affected by the side wall of the connecting section 23 to form a pressure difference between the feed end and the discharge end of the connecting section 23, thereby increasing the flow rate of the powder coating flowing out of the connecting section 23 and enhancing the spraying effect. In this embodiment, a first mounting hole 5 is opened on the side wall of the tapered expansion section 21 along its axial direction, and the first mounting hole 5 has a certain installation depth. In this embodiment, the number of the first mounting holes 5 is two, and the two first mounting holes 5 are symmetrically arranged. A second mounting hole 6 is arranged on the outer wall of the base 1 along its radial direction. The position of the second mounting hole 6 corresponds to the first mounting hole 5, and the end of the second mounting hole 6 is connected to the middle of the first mounting hole 5.

[0031] In this example, see Figures 2 to 5 A connecting rod 4 is welded and fixed on the conical surface of the first block 31 along its axial direction. In this embodiment, there are two connecting rods 4, and the two connecting rods 4 are arranged symmetrically. When in use, the ends of the two connecting rods 4 away from the first block 31 are respectively inserted into the two first mounting holes 5, and the connecting rods 4 and the first mounting holes 5 are in sliding fit. By sliding the connecting rods 4 and adjusting the depth of the connecting rods 4 inserted into the first mounting holes 5, the size of the injection gap 101 between the first block 31 and the conical expansion section 21 can be adjusted. When in use, the second mounting hole 6 is internally threaded with a push rod 7. By rotating the push rod 7, the push rod 7 can pass through the second mounting hole 6 and press against the connecting rod 4, thereby limiting the sliding of the connecting rod 4 in the first mounting hole 5.

[0032] In addition, in this embodiment, the arc of the inward bending of the conical surface of the first block 31 is optionally between π / 4-π / 3rad. By setting a certain arc on the conical surface of the first block 31, not only the spraying direction of the powder coating can be changed and the spraying angle can be increased, but also the spraying gap 101 can be relatively enlarged, so that the transportation of the powder coating is smoother and less prone to blockage. In addition, after the conical surface of the first block 31 is bent inward with an arc, the weight of the first block 31 is relatively reduced, so that the connecting rod 4 connected between the first block 31 and the conical expansion section 21 is not easy to be damaged and has a long service life. It also allows the connecting rod 4 to use a rod with a smaller diameter to support the guide block 3. After the diameter of the connecting rod 4 becomes smaller, when the powder coating passes through the spraying gap 101, the connecting rod 4 has less obstruction on the powder coating. Optionally, the diameter of the connecting rod 4 is 2-3mm.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A powder spray head, characterized in that: The invention comprises a base (1), wherein a flow hole (2) is provided in the middle of the base (1), a conical expansion section (21) is provided at the front end of the flow hole (2), a guide block (3) is provided at the front end of the conical expansion section (21), the guide block (3) comprises a first block (31) and a second block (32) connected to each other, the first block (31) is partially inserted into the conical expansion section (21), an injection gap (101) is provided between the first block (31) and the conical expansion section (21), the first block (31) is a conical body, and the outer periphery of the first block (31) forms a guide arc surface that bends inwards.

2. A powder spray head as claimed in claim 1, characterized in that: The radian of the guide cambered surface is between π / 4-π / 3rad.

3. A powder spray head as claimed in claim 1, characterized in that: The first block (31) and the second block (32) are arranged symmetrically.

4. A powder spray head as claimed in claim 1, characterized in that: The first block (31) is coaxially arranged with the conical hole expansion section (21), and the first block (31) and the conical hole expansion section (21) are connected via a connecting rod (4).

5. A powder spray head as claimed in claim 1, characterized in that: The rear end of the flow hole (2) is provided with an assembly section (22), and the assembly section (22) is used to be installed on the spray gun. A connecting section (23) is provided between the assembly section (22) and the conical expansion section (21).

6. A powder spray head as claimed in claim 5, characterized in that: The cross-sectional area of ​​the connecting section (23) decreases gradually from the side of the assembling section (22) to the side of the conical expansion section (21).

7. A powder spray head as claimed in claim 4, characterized in that: One end of the connecting rod (4) is welded and fixed to the first block (31), and the other end of the connecting rod (4) is inserted into the conical expansion section (21).

8. A powder spray head as claimed in claim 7, characterized in that: A first mounting hole (5) is provided on the side wall of the conical expansion section (21) along its axial direction, and the connecting rod (4) is slidably inserted into the first mounting hole (5).

9. A powder spray head as claimed in claim 8, characterized in that: A second mounting hole (6) is radially opened on the side wall of the base (1), the second mounting hole (6) is connected to the first mounting hole (5), a push rod (7) is internally threadedly connected to the second mounting hole (6), and the push rod (7) abuts against the connecting rod (4) to limit the movement of the connecting rod (4).

10. A powder spray head as claimed in claim 4, characterized in that: The diameter of the connecting rod (4) is no greater than 3 mm.

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