Novel three-piece type nozzle

Abstract

The utility model discloses a novel three-piece type nozzle. The novel three-piece type nozzle comprises a diverging nozzle, a throat part and a converging nozzle, one end of the diverging nozzle is provided with a conical flaring and an auxiliary mounting part at the other end of the conical flaring; a stepped hole is formed in the auxiliary mounting part and is communicated with a conical hole in the center of the diverging nozzle; a throat part is mounted in the conical hole, and a converging nozzle is mounted in the stepped hole; while the performance of sand blasting equipment is maintained or improved, the productivity is improved, the cost is reduced, and the influence on the environment is reduced to the greatest extent.

Description

Technical Field

[0001] The utility model relates to a novel three-piece nozzle. Background Art

[0002] Dry blasting is a common method used in the marine industry to remove rust and old coatings from the surface of a vessel in preparation for new paint. The process involves using compressed air to propel abrasive media at high speeds against the surface, which not only removes unwanted material but also creates a rough profile that aids the adhesion of new paint.

[0003] The existing technology is a conventional one-piece nozzle with a tungsten carbide liner. Tungsten carbide is favored for its hardness and durability, making it suitable for high-wear applications such as sandblasting. It is heat and wear resistant, has a low coefficient of thermal expansion, and is chemically inert, preventing corrosion in most environments.

[0004] However, disadvantages of the existing technology include the heavy weight of tungsten carbide nozzles, which can reduce user productivity. In addition, these nozzles have a limited service life and need to be replaced every 6 to 8 weeks due to wear. When damaged, the entire nozzle must be disposed of, resulting in waste and increased costs. The high cost of tungsten carbide also prevents users from considering better materials. Tungsten carbide nozzles are effective in their intended use, but their weight, cost and durability pose significant challenges. Utility Model Content

[0005] In view of the above problems, the purpose of the utility model is to improve productivity, reduce costs and minimize the impact on the environment while maintaining or improving the performance of the sandblasting equipment.

[0006] The technical solution to realize the utility model is as follows

[0007] A novel three-piece nozzle comprises a diverging nozzle, a throat and a converging nozzle; the diverging nozzle has a conical expansion at one end and an auxiliary mounting portion at the other end of the conical expansion; a stepped hole is arranged in the auxiliary mounting portion, and the stepped hole is connected to the conical hole in the center of the diverging nozzle; the throat is installed in the conical hole, and the converging nozzle is installed in the stepped hole.

[0008] The outer surface of the converging nozzle is provided with an external thread, and the end surface of the converging nozzle insertion end is provided with an annular protrusion; the inner wall surface of the stepped hole of the auxiliary mounting part is provided with an internal thread used in conjunction with the external thread.

[0009] The throat is cylindrical, and a passage is continuously formed in the throat by a first tapered hole, a transition hole and a second tapered hole; the first tapered hole is continuous with the tapered hole, and the second tapered hole is continuous with the third tapered hole in the center of the converging nozzle.

[0010] A plurality of screw holes are evenly distributed on the outer surface of the auxiliary mounting portion, and fixing screws for fixing the converging nozzle are installed in the screw holes.

[0011] At least one group of graphite filler groups is sleeved on the throat between the throat and the stepped hole, and each group of graphite filler groups includes two graphite fillers.

[0012] A groove is arranged on the auxiliary installation part at the fixing screw.

[0013] The third tapered hole and the tapered hole are both provided with an inner lining which is made of a hard material.

[0014] The above technical solution is adopted: 1. The new nozzle consists of three independent parts (divergent nozzle, throat and convergent nozzle); this modular design allows individual parts to be replaced as needed, rather than dealing with the entire nozzle when the nozzle is damaged and corroded. This modular design minimizes waste by allowing partial replacement rather than full replacement.

[0015] 2. The inner lining can be made of hard materials, such as boron carbide. Using harder materials as the inner lining can extend the overall service life of the nozzle.

[0016] 3. When the nozzle is damaged, especially the throat, it can be replaced independently of the rest of the nozzle, so that only the damaged throat needs to be replaced, which can significantly reduce maintenance costs.

[0017] 4. The throat structure is optimized to increase the sandblasting speed and improve the efficiency of the sandblasting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] In the accompanying drawings, 1 is a divergent nozzle, 2 is a throat, 3 is a convergent nozzle, 4 is a tapered expansion, 5 is an auxiliary mounting portion, 6 is a stepped hole, 7 is a tapered hole, 8 is an external thread, 9 is an annular protrusion, 10 is an internal thread, 11 is a first tapered hole, 12 is a transition hole, 13 is a second tapered hole, 14 is a third tapered hole, 15 is a fixing screw, 16 is a graphite filler, and 18 is an inner liner. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] A novel three-piece nozzle comprises a diverging nozzle 1, a throat 2 and a converging nozzle 3; the diverging nozzle is cylindrical, with a conical expansion at one end of the diverging nozzle and an auxiliary mounting portion 5 at the other end of the conical expansion 4, the auxiliary mounting portion being cylindrical; a stepped hole 6 is arranged in the auxiliary mounting portion, the stepped hole being connected to a conical hole 7 in the center of the diverging nozzle; a throat is installed in the conical hole, and a converging nozzle is installed in the stepped hole. Since the diverging nozzle, the throat and the converging nozzle are all conveniently disassembled structures, when the nozzle is damaged, especially the throat, it can be replaced separately from the rest of the nozzle, reducing maintenance costs; improvements in the nozzle's materials, design and functionality not only improve its performance, but also contribute to a more sustainable approach by reducing waste and maintenance costs; improving maintenance practices for ship surface treatment and increasing productivity in the marine industry.

[0022] The outer surface of the converging nozzle is provided with an external thread 8, and the end surface of the converging nozzle insertion end is provided with an annular protrusion 9; the inner wall surface of the stepped hole of the auxiliary mounting portion is provided with an internal thread 10 used in conjunction with the external thread. The annular protrusion is inserted into the stepped hole as a pre-positioning structure, and the converging nozzle and the diverging nozzle are assembled by threaded connection.

[0023] The throat is cylindrical, and a channel is continuously formed in the throat by the first tapered hole 11, the transition hole 12 and the second tapered hole 13; the first tapered hole is continuous with the tapered hole, and the second tapered hole is continuous with the third tapered hole 14 in the center of the converging nozzle. The throat adopts the above structure, which improves the sandblasting speed and the efficiency of the sandblasting process.

[0024] The outer surface of the auxiliary mounting portion is evenly distributed with a plurality of screw holes, and the screw holes are provided with fixing screws 15 for fixing the converging nozzle. The fixing screws cooperate with the external threads to assist in fixing the converging nozzle.

[0025] At least one group of graphite filler groups is sleeved on the throat between the throat and the stepped hole, and each group of graphite filler groups includes two graphite fillers 16 (graphite fillers can be graphite filler rings, etc.).

[0026] The auxiliary installation part at the fixing screw is provided with a groove, which is a straight structure and is convenient for installing the fixing screw.

[0027] The third tapered hole and the tapered hole are both provided with an inner liner 18, which is made of a hard material, such as boron carbide. Boron carbide provides higher durability and longer service life, thereby improving the service life of the nozzle.

Claims

1. A new type of three-piece nozzle, characterized in that: It comprises a diverging nozzle, a throat and a converging nozzle; the diverging nozzle has a conical expansion at one end and an auxiliary mounting portion at the other end of the conical expansion; a stepped hole is arranged in the auxiliary mounting portion, and the stepped hole is connected with the conical hole in the center of the diverging nozzle; the throat is installed in the conical hole, and the converging nozzle is installed in the stepped hole.

2. A novel three-piece nozzle according to claim 1, characterized in that: The outer surface of the converging nozzle is provided with an external thread, and the end surface of the converging nozzle insertion end is provided with an annular protrusion; the inner wall surface of the stepped hole of the auxiliary mounting part is provided with an internal thread used in conjunction with the external thread.

3. A novel three-piece nozzle according to claim 1, characterized in that: A passage is continuously formed in the throat by the first tapered hole, the transition hole and the second tapered hole; the first tapered hole is continuous with the tapered hole, and the second tapered hole is continuous with the third tapered hole in the center of the converging nozzle.

4. A novel three-piece nozzle according to claim 1, characterized in that: A plurality of screw holes are evenly distributed on the outer surface of the auxiliary mounting portion, and fixing screws for fixing the converging nozzle are installed in the screw holes.

5. A novel three-piece nozzle according to claim 1, characterized in that: At least one group of graphite filler groups is sleeved on the throat between the throat and the stepped hole, and each group of graphite filler groups includes two graphite fillers.

6. A novel three-piece nozzle according to claim 4, characterized in that: A groove is arranged on the auxiliary installation part at the fixing screw.

7. A novel three-piece nozzle according to claim 3, characterized in that: The third tapered hole and the tapered hole are both provided with liners.

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