Spray port structure and nozzle

Abstract

The present invention proposes a material spraying port structure and a nozzle, which relate to the technical field of powder spraying. The material spraying port structure comprises an outer sleeve and an inner core, wherein the inner core is inserted into the outer sleeve, and an annular interval is provided between the inner core and the outer sleeve, and an annular outlet is formed at one end of the annular interval, and the inner core is located at the annular outlet as the outlet end, and at least one guide groove is provided on the outer wall of the inner core, and the guide groove runs through the end face of the outlet end of the inner core and forms a guide outlet, and the annular outlet and the guide outlet together form a material spraying port. The material spraying port structure and the nozzle proposed by the present invention can effectively reduce the accumulation and sticking of powder at the end face of the inner core of the material spraying port, and ensure that powder is sprayed out in front of the end face of the inner core of the nozzle, thereby improving the uniformity of spraying.

Description

Technical Field

[0001] The invention relates to the technical field of powder spraying, and in particular to a spray port structure and a nozzle. Background Art

[0002] The existing nozzle for powder spraying device is composed of an outer shell and an inner core inserted in the outer shell. The outer shell and the inner core are of rotary structure, and an annular cavity is formed between the outer shell and the inner core. The powder with static electricity is mixed with compressed air and enters from the upper inlet of the nozzle. After passing through the cavity, it is sprayed out from the spray port at the bottom of the cavity.

[0003] Existing nozzles for powder spraying devices have the following disadvantages:

[0004] 1. When the powder with static electricity is sprayed out from the spray nozzle, since the compressed air is under pressure at the top of the nozzle and in the cavity of the nozzle, the compressed air will expand rapidly after being sprayed out from the spray nozzle and entering the atmospheric space. In addition, the compressed air will spread very quickly after being sprayed out from the spray nozzle, which will cause a negative pressure cavity at the bottom of the inner core. Due to the speed of the scattered compressed air and powder, it is difficult for the surrounding air to be replenished in time, resulting in negative pressure. When the nozzle sprays powder for a long time, this negative pressure will gradually attract and press the powder in the spraying process onto the bottom plane of the inner core, causing the powder to adhere to the bottom surface of the umbrella-shaped inner core;

[0005] 2. Since the nozzle jacket and the umbrella-shaped inner core are both cavities with gradually expanding diameters, the powder will diffuse and spray out along the gradually expanding cavity when it is sprayed out with compressed air, and continue to diffuse along the spraying direction after leaving the spray port, intensifying the formation of a negative pressure cavity at the bottom of the inner core, exacerbating the powder sticking condition at the bottom of the umbrella-shaped inner core.

[0006] Due to the above two shortcomings of the nozzle, over time, as the powder attached to the bottom of the inner core increases, some of the accumulated powder will fall down due to gravity or uncertain external force. If the product being sprayed is located below the nozzle or in the direction of powder spraying at this time, the large particles formed by the accumulated powder will fall on the sprayed parts or be blown onto the sprayed products by the compressed air sprayed from the nozzle, causing uneven powder adhesion on the surface of the sprayed products, powder nodules or powder lumps, and resulting in unqualified products.

[0007] In addition, in the process of spraying powder from the nozzle of the powder spraying device, since the outer shell and the umbrella-shaped inner core are both gradually expanding cavities, the powder will diffuse and spray along the gradually expanding cavity when sprayed with compressed air. After spraying, it will continue to diffuse along the spraying direction to form an umbrella-like shape. The middle part of the umbrella is hollow, which will cause instantaneous unevenness of the powder on the surface of the sprayed product, increasing the difficulty of achieving uniformity of the powder on the product spray surface.

[0008] In view of this, the inventor has designed a spray port structure and a nozzle based on many years of experience in production design in this field and related fields and through repeated experiments, in order to solve the problems existing in the prior art. Summary of the invention

[0009] The object of the present invention is to provide a spray port structure and a nozzle, which can effectively reduce powder accumulation and powder sticking at the end face of the inner core of the spray port, and ensure that powder is sprayed out in front of the end face of the inner core of the nozzle, thereby improving the uniformity of spraying.

[0010] In order to achieve the above-mentioned purpose, the present invention proposes a spray port structure, wherein the spray port structure includes an outer sleeve and an inner core, the inner core is inserted into the outer sleeve, an annular space is provided between the inner core and the outer sleeve, an annular outlet is formed at one end of the annular space, the end of the inner core located at the annular outlet is the outlet end, at least one guide groove is provided on the outer side wall of the inner core, the guide groove penetrates to the end face of the inner core at its outlet end and forms a guide outlet, and the annular outlet and the guide outlet together form a spray port.

[0011] In the injection port structure as described above, the depth of the guide groove is set to gradually increase toward the guide outlet.

[0012] As described above, the spray port structure, wherein the outer wall of the outlet end of the inner core is in the shape of a trumpet that gradually expands toward the annular outlet, the inner wall of the outer shell is also arranged in the shape of a gradually expanding trumpet, and the edge of the outlet end of the inner core and the edge of the outer shell at the annular outlet are both pointed.

[0013] In the injection port structure as described above, the guide groove is opened in a direction parallel to the axis of the inner core.

[0014] In the injection port structure as described above, the guide groove is opened in a direction inclined to the axis of the inner core.

[0015] In the injection port structure as described above, the guide groove is opened along a spiral line.

[0016] In the injection port structure as described above, the width of the guide groove is 1 to 3 mm, and the depth of the guide outlet along the radial direction of the inner core is 2 to 7 mm.

[0017] In the injection port structure as described above, a plurality of guide grooves are provided on the outer wall of the inner core, and the plurality of guide grooves are evenly distributed along the circumferential direction of the inner core.

[0018] The present invention provides a nozzle for a powder spraying device, wherein the nozzle has the spray port structure as described above.

[0019] The nozzle as described above, wherein the outer shell and the inner core are both made of metallic conductive material.

[0020] Compared with the prior art, the present invention has the following characteristics and advantages:

[0021] The spray port structure and nozzle proposed in the present invention are used for spraying powder. The powder flows through the annular gap and is sprayed out from the spray port. Since a guide outlet is provided on the end face of the inner core outlet end, when spraying powder, part of the powder is sprayed out from the annular outlet through the annular gap together with the compressed air, while the other part of the powder is sprayed out from the guide outlet through the guide groove to fill the cavity formed by the negative pressure generated at the end face of the inner core outlet end due to the powder jet of the annular outlet, thereby being able to blow away the powder that has not had time to adhere and accumulate at the inner core outlet end to prevent adhesion, thereby ensuring that the outlet end of the inner core will not have sticky powder and accumulated powder falling off, avoiding the formation of powder nodules on the sprayed product due to falling and accumulated powder, ensuring that the powder on the surface of the sprayed product is uniform, and effectively reducing the unqualified rate of the sprayed product.

[0022] The spray port structure and nozzle proposed in the present invention are used for spraying powder. A guide outlet is opened on the end face of the inner core outlet end. When spraying powder, part of the powder is sprayed out from the annular outlet, and the other part of the powder is sprayed out from the guide outlet through the guide groove, so that the powder sprayed from the nozzle port has both umbrella-shaped diffusion and straight or oblique spraying from the front of the nozzle port, avoiding the umbrella-shaped hollow state of the sprayed powder, ensuring the uniform distribution of powder on the surface of the sprayed product, and improving the spraying uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0024] Figure 1 This is a schematic diagram of the structure of the injection port proposed by the present invention;

[0025] Figure 2 A schematic diagram of an embodiment of a diversion outlet in the present invention;

[0026] Figure 3 A schematic diagram of another embodiment of the diversion outlet in the present invention;

[0027] Figure 4 A schematic diagram of an embodiment of a guide channel in the present invention;

[0028] Figure 5 FIG. 4 is a schematic diagram of another embodiment of the guide groove in the present invention.

[0029] Description of reference numerals:

[0030] 100. Spray port structure; 10. Jacket;

[0031] 20. inner core; 21. guide groove;

[0032] 22. diversion outlet; 30. annular spacer;

[0033] 31. Annular outlet; L1. Width;

[0034] L2, depth; 200, nozzle. DETAILED DESCRIPTION

[0035] The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should all be considered to belong to the scope of the present invention.

[0036] like Figures 1 to 5 As shown, the present invention proposes a spray port structure 100, which includes an outer sleeve 10 and an inner core 20. The inner core 20 is inserted into the outer sleeve 10. An annular spacer 30 is provided between the inner core 20 and the outer sleeve 10. An annular outlet 31 is formed at one end of the annular spacer 30. The end of the inner core 20 located at the annular outlet 31 is the outlet end. At least one guide groove 21 is provided on the outer wall of the inner core 20. The guide groove 21 penetrates to the end face of the outlet end of the inner core 20 and forms a guide outlet 22. The annular outlet 31 and the guide outlet 22 together form the spray port.

[0037] The present invention further provides a nozzle 200 for a powder spraying device. The nozzle 200 has the spray port structure 100 as described above.

[0038] The spray port structure 100 and the nozzle 200 proposed in the present invention are used for spraying powder. The powder flows through the annular gap 30 and is sprayed out from the spray port. Since a guide outlet 22 is provided on the end face of the outlet end of the inner core 20, when spraying powder, part of the powder is sprayed out from the annular outlet 31 through the annular gap 30 together with the compressed air, while the other part of the powder is sprayed out from the guide outlet 22 through the guide groove 21 to fill the cavity formed by the negative pressure generated at the end face of the outlet end of the inner core 20 due to the powder jet of the annular outlet 31, and then the powder that has not had time to adhere and accumulate at the outlet end of the inner core 20 can be blown away to prevent adhesion, thereby ensuring that the outlet end of the inner core 20 will not have sticky powder and accumulated powder falling, avoiding the formation of powder nodules on the sprayed product due to falling and accumulated powder, ensuring that the powder on the surface of the sprayed product is uniform, and effectively reducing the unqualified rate of the sprayed product.

[0039] The spray port structure 100 and the nozzle 200 proposed in the present invention are used for spraying powder. A guide outlet 22 is opened on the end face of the outlet end of the inner core 20. When spraying powder, part of the powder is sprayed out from the annular outlet 31, and the other part of the powder is sprayed out from the guide outlet 22 through the guide groove 21, so that the powder sprayed from the nozzle port has both umbrella-shaped diffusion and straight or oblique spraying from the front of the nozzle port, avoiding the umbrella-shaped hollow state of the sprayed powder, ensuring the uniform distribution of powder on the surface of the sprayed product, and improving the uniformity of spraying.

[0040] In an optional embodiment of the present invention, the outer wall of the outlet end of the inner core 20 is in a trumpet shape that gradually expands toward the annular outlet 31, and the inner wall of the outer shell 10 is also arranged in a gradually expanding trumpet shape. With the above structure, the powder sprayed from the annular outlet 31 will diffuse in an umbrella shape after leaving the annular outlet 31, which effectively enhances the atomization effect of the sprayed powder and improves the uniformity of the spraying.

[0041] In an optional example of this embodiment, the end surface of the outlet end of the inner core 20 protrudes from the outer sleeve 10, and the edge of the outlet end is sharp-angled, and the end edge of the outer sleeve 10 located at the annular outlet 31 is also sharp-angled. After the nozzle 200 is connected to the electrostatic generator, a relatively strong electric field can be generated at the sharp corner to increase the charge rate of the powder sprayed from the spray port.

[0042] In an optional embodiment of the present invention, the guide groove 21 is opened in a direction parallel to the axis of the inner core 20 .

[0043] In another optional embodiment of the present invention, the guide groove 21 is opened along a direction inclined to the axis of the inner core 20 .

[0044] In an optional example of this embodiment, the angle b between the guide groove 21 and the axis of the inner core 20 is 0 to 60 degrees.

[0045] In yet another optional embodiment of the present invention, the guide groove 21 is opened along a spiral line.

[0046] In an optional example of this embodiment, the helix angle of the helix (not shown in the figure) is 0 to 60 degrees.

[0047] In an optional embodiment of the present invention, the cross section of the guide groove 21 is rectangular, the guide outlet 22 is also rectangular, and the angle formed by the inner core 20 at the guide outlet 22 is a square angle or a sharp angle, which is conducive to generating a relatively strong electric field. In the above structure, as the length of the sharp angle increases, the charging capacity of the powder sprayed from the spray port will also increase, thereby increasing the charge rate of the sprayed powder, improving the utilization rate of the powder on the surface of the sprayed product, and reducing the waste of powder.

[0048] In an optional embodiment of the present invention, the depth of the guide groove 21 is configured to gradually increase toward the guide outlet 22 .

[0049] In an optional example of this embodiment, the width L1 of the guide groove 21 is 1 to 3 mm, and the depth L2 of the guide groove 21 at the guide outlet 22 is 2 to 7 mm.

[0050] In an optional embodiment of the present invention, Figure 2 As shown, the depth direction of the guide groove 21 is set to be opened along the radial direction of the inner core 20, that is, the guide groove 21 is opened from the outer wall of the inner core 20 along the radial direction of the inner core 20 toward the axis of the inner core 20.

[0051] In another optional embodiment of the present invention, Figure 3 As shown, the depth direction of the guide groove 21 is set to have an angle a with the radial direction of the inner core 20 , that is, the guide groove 21 is opened along a direction inclined to the radial direction of the inner core 20 .

[0052] In an optional embodiment of the present invention, a plurality of guide grooves 21 are formed on the outer wall of the inner core 20 , and the plurality of guide grooves 21 are evenly distributed along the circumferential direction of the inner core 20 .

[0053] In an optional example of this embodiment, 2 to 6 guide grooves 21 are evenly distributed on the outer wall of the inner core 20 , and correspondingly, 2 to 6 guide outlets 22 are formed on the end surface of the outlet end of the inner core 20 .

[0054] In an optional embodiment, the outer shell 10 and the inner core 20 are both made of a metal conductive material. When the nozzle 200 is connected to the electrostatic generator, a relatively strong electric field is generated at the tip of the annular outlet 31 of the nozzle 200. At the same time, since the diversion outlet 22 is rectangular and its vertex angles are also square or sharp, a relatively strong electric field is generated, which further increases the charging capacity of the powder sprayed through the annular outlet 31 and the diversion outlet 22, and also increases the charge rate of the sprayed powder, and finally increases the powder coating rate of the electrostatically charged powder sprayed onto the surface of the product, greatly improving the utilization rate of the powder and reducing the waste of the powder.

[0055] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A spray port structure, characterized in that: The spray port structure comprises an outer sleeve and an inner core, wherein the inner core is inserted into the outer sleeve, an annular space is provided between the inner core and the outer sleeve, an annular outlet is formed at one end of the annular space, an end of the inner core located at the annular outlet is an outlet end, at least one guide groove is provided on the outer wall of the inner core, the guide groove penetrates to the end surface of the outlet end of the inner core and forms a guide outlet, and the annular outlet and the guide outlet together form a spray port; The depth of the diversion groove is set to gradually increase toward the diversion outlet; The guide groove is opened along a direction inclined to the axis of the inner core or along a spiral line.

2. The spray port structure according to claim 1, characterized in that: The outer wall of the outlet end of the inner core is in a trumpet shape that gradually expands toward the annular outlet, and the inner wall of the outer shell is also correspondingly arranged in a gradually expanding trumpet shape; the edge of the outlet end of the inner core and the edge of the outer shell at the annular outlet are both pointed.

3. The spray port structure according to claim 1, characterized in that: The width of the guide groove is 1 to 3 mm, and the depth of the guide outlet along the radial direction of the inner core is 2 to 7 mm.

4. The spray port structure according to claim 1, characterized in that: A plurality of guide grooves are provided on the outer side wall of the inner core, and the plurality of guide grooves are evenly distributed along the circumferential direction of the inner core.

5. A nozzle for a powder spraying device, characterized in that: The nozzle has a spray port structure as described in any one of claims 1 to 4.

6. The nozzle according to claim 5, characterized in that The outer shell and the inner core are both made of metallic conductive material.

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