CN210237749U

CN210237749U - Nozzle protection cover

Info

Publication number: CN210237749U
Application number: CN201920424765.6U
Authority: CN
Inventors: Changfa Wen; 温昌发; Bitao Liu; 刘碧涛; Wenguang Ma; 马文光
Original assignee: Guangdong Brightas Laser Science & Technology Co ltd
Current assignee: Guangdong Brightas Laser Science & Technology Co ltd
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-04-03
Anticipated expiration: 2029-03-28

Abstract

The utility model discloses a nozzle safety cover. Relates to a spraying device, in particular to improvement of a nozzle protection cover. The nozzle protection cover is provided, supersonic spraying can be achieved, ablation conditions are few, and the service life is long. The device comprises an outer pipe and an inner pipe arranged in the outer pipe, wherein one end of the inner pipe is a first conical pipe with a large opening and a small bottom, the other end of the inner pipe is a second conical pipe with a small opening and a large bottom, and an opening of the second conical pipe is communicated with the bottom of the first conical pipe. The outer pipe is sleeved at the bottom of the first conical pipe. The special protective cover is added above the nozzle of the original plasma spray gun, so that the flame flow speed is greatly improved, the particles fly to reach a supersonic speed state, and the bonding strength and the density of the coating are improved. At the same time, the external atmosphere is isolated from entering the flame flow to reduce the oxidation of the particles.

Description

Nozzle protection cover

Technical Field

The utility model relates to a spraying equipment especially relates to the improvement to the nozzle safety cover.

Background

Currently, tungsten carbide spraying is used for surface treatment of metal (for example, metal surface rust prevention and the like) and is a common means for those skilled in the art, and there are powder flame spraying method, explosion spraying method and the like, which all adopt high temperature to melt tungsten carbide powder to liquid or semi-liquid state, and then spray the tungsten carbide powder to the metal surface at high speed to form a metal coating layer so as to play a role of protection. In the spraying process, due to the fact that high-temperature heating is needed, the nozzle can be ablated by flame, meanwhile, the nozzle can be abraded by powder, the nozzle needs to be replaced frequently, working efficiency is affected, and the existing nozzle cannot achieve supersonic thermal spraying.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a nozzle protection cover, which can realize supersonic spraying and long service life with less ablation conditions.

The utility model discloses a following technical scheme realizes: the utility model provides a nozzle protection cover, includes the outer tube and arranges the inner tube in affiliated outer tube in, the one end of inner tube is the first conical duct that the mouth is big end, the other end of inner tube is the big second conical duct of the mouth end, the mouth of second conical duct with the end intercommunication of first conical duct. The outer pipe is sleeved at the bottom of the first conical pipe.

The opening of the second conical pipe is the same as the bottom of the first conical pipe in size.

And a plurality of through holes are uniformly distributed on the side wall of the outer pipe.

And the first conical pipe is provided with a positioning hole.

The positioning hole is formed in the bottom of the first conical pipe, penetrates through the outer wall of the first conical pipe and is a threaded hole.

Compared with the prior art, the beneficial effects of the utility model reside in that: the special protective cover is added above the nozzle of the original plasma spray gun, so that the flame flow speed is greatly improved, the particles fly to reach a supersonic speed state, and the bonding strength and the density of the coating are improved. At the same time, the external atmosphere is isolated from entering the flame flow to reduce the oxidation of the particles.

Drawings

FIG. 1 is a schematic view of the inner tube structure of the present invention;

FIG. 2 is a schematic view of the structure of the outer tube of the present invention;

FIG. 3 is a schematic view of the assembly of the outer tube and the inner tube of the present invention;

in the figure: 1. an outer tube; 2. an inner tube; 3. a first tapered tube; 4. a second tapered tube.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

The utility model provides a nozzle protection cover, includes outer tube 1 and arranges inner tube 2 in affiliated outer tube 1 in, the one end of inner tube 2 is the first conical duct 3 that the mouth is big end, the other end of inner tube 2 is the second conical duct 4 that the mouth is big end, the mouth of second conical duct 4 with the end intercommunication of first conical duct 3. The outer pipe 1 is sleeved at the bottom of the first conical pipe 3. The special protective cover is added above the nozzle of the original plasma spray gun, so that the flame flow speed is greatly improved, the particles fly to reach a supersonic speed state, and the bonding strength and the density of the coating are improved. At the same time, the external atmosphere is isolated from entering the flame flow to reduce the oxidation of the particles.

The opening of the second conical pipe 4 is the same as the bottom of the first conical pipe 3, and a plurality of through holes are uniformly distributed on the side wall of the outer pipe 1. And the first conical pipe 3 is provided with a positioning hole. The positioning hole is formed in the bottom of the first conical pipe 3, penetrates through the outer wall of the first conical pipe 3 and is a threaded hole.

The front half part of the inner tube 2 is contracted from big to small to the middle to the throat part of the protective cover. The throat is then expanded from smaller to larger. The gas in the combustion chamber flows into the front half of the nozzle under high pressure, passes through the throat and escapes from the rear half. The structure can change the speed of the airflow due to the change of the spray cross section area, so that the airflow is accelerated from subsonic speed to sonic speed to supersonic speed. The second part is an external cooling jacket (outer pipe) which cools the inner pipe 2 and prevents high temperature from ablating the inner pipe.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. The utility model provides a nozzle protection cover, includes the outer tube and arranges the inner tube in affiliated outer tube in, its characterized in that, the one end of inner tube is the first conical duct that the mouth is big end, the other end of inner tube is the big second conical duct at the end of the mouth is little, the mouth of second conical duct with the end intercommunication of first conical duct, the outer tube is established to the end cover of first conical duct.

2. A nozzle boot according to claim 1, wherein the mouth of said second conical tube is the same size as the base of said first conical tube.

3. The nozzle boot of claim 1, wherein a plurality of through holes are uniformly distributed in the sidewall of the outer tube.

4. The nozzle boot of claim 1, wherein said first tapered tube is provided with a locating hole.

5. The nozzle protector of claim 4, wherein said positioning hole is formed in a bottom portion of said first tapered tube, said positioning hole penetrating through an outer wall of said first tapered tube, said positioning hole being a threaded hole.