Two-fluid spraying knife

Abstract

The utility model relates to the technical field of sand blasting equipment, and particularly discloses a two-fluid spraying knife, which comprises a water inlet assembly, a water outlet assembly and a water outlet assembly, the water passing assembly is located below the water inlet assembly and provided with a water passing cavity, and the upper portion of the water passing cavity communicates with the water inlet cavity; the air inlet assembly is located in the water passing cavity and provided with an air inlet cavity communicating downwards to the bottom of the water passing cavity. A water passing channel communicating the upper portion of the water passing cavity with the lower portion of the water passing cavity is formed between the outer wall of the air inlet assembly and the inner wall of the water passing assembly. The water jet nozzle is located below the air inlet assembly and provided with a sand blasting opening communicated to the lower portion of the water passing cavity. The two-fluid spraying knife provided by the utility model can effectively solve the problem of overlarge pressure drop caused by long distance from the air inlet cavity to the sand spraying opening.

Description

Technical Field

[0001] The utility model relates to the technical field of sandblasting equipment, in particular to a two-fluid spray knife. Background Art

[0002] In the existing sandblasting equipment, single-fluid or two-fluid sandblasting technology is usually adopted. The single-fluid sandblasting technology mainly directly extracts sand-water abrasive through a sand pump and sprays it onto the surface of the workpiece (without air flow pressurization) to strike the surface of the workpiece, so as to achieve the sandblasting effect. The two-fluid sandblasting technology is to mix water and abrasive and spray the mixture out through a high-speed air flow to achieve the sandblasting effect. However, the existing two-fluid spray knives have the following problems:

[0003] The water inlet cavity of the sand and water in the spray knife is usually higher than the air inlet cavity of the compressed air. Therefore, the distance of the compressed air from the air inlet cavity to the sandblasting port is relatively long, and the pressure drop is large, which seriously affects the impact force when the sand and water are ejected, and finally makes it difficult to achieve the expected sandblasting effect.

[0004] Therefore, it is necessary to improve the existing two-fluid spray knife to solve the problem of excessive pressure drop caused by the long distance from the air inlet cavity to the sandblasting port.

[0005] The above information disclosed in this background section is only included to enhance the understanding of the background of the present disclosure, and thus may include information that does not form the prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0006] An object of the utility model is to provide a two-fluid spray knife, which can effectively solve the problem of excessive pressure drop caused by the long distance from the air inlet cavity to the sandblasting port.

[0007] To achieve the above object, the utility model provides a two-fluid spray knife, comprising:

[0008] A water inlet assembly, which is provided with a water inlet cavity;

[0009] A water passing assembly, which is located below the water inlet assembly and is provided with a water passing cavity with an upper part communicating with the water inlet cavity;

[0010] An air inlet assembly, which is located in the water passing cavity and is provided with an air inlet cavity communicating downward with the bottom of the water passing cavity; wherein, a water passing channel communicating the upper part of the water passing cavity to the lower part of the water passing cavity is formed between the outer wall of the air inlet assembly and the inner wall of the water passing assembly;

[0011] A water knife nozzle, which is located below the air inlet assembly and is provided with a sandblasting port communicating with the lower part of the water passing cavity.

[0012] Optionally, the water inlet assembly is provided with an upper channel extending downward from the bottom of the water inlet chamber, and the water passing assembly is provided with a lower channel extending upward from the top surface of the water passing chamber to communicate with the upper channel.

[0013] Optionally, the diameter of the upper channel is smaller than the diameter of the lower channel.

[0014] Optionally, the air inlet assembly is further provided with a blowing channel extending downward from the bottom of the air inlet chamber to the bottom surface of the air inlet assembly.

[0015] Optionally, the water passing assembly is further provided with a mixing channel communicating the bottom of the water passing chamber to the sand blasting port.

[0016] Optionally, the blowing channel and the mixing channel are in a straight line.

[0017] Optionally, the number of the water inlet chambers is two.

[0018] Optionally, the two water inlet chambers are symmetrically arranged with respect to the blowing channel.

[0019] The beneficial effects of the present utility model are as follows: A two-fluid spray knife is provided. When performing sand blasting operation, sand water is fed into the water inlet chamber and compressed air is fed into the air inlet chamber. The compressed air flows downward and enters the water knife nozzle through the lower part of the water chamber. At this time, a low-pressure adsorption phenomenon is caused in the water passing chamber by the high-speed air flow, so that the air flow in the water passing chamber moves downward, and then the sand water in the water inlet chamber is sucked downward into the water passing chamber; after the sand water is sucked into the water passing chamber, it flows downward through the water channel to the water knife nozzle to be mixed with the compressed air, and finally is sprayed out through the sand blasting port to wash the surface of the workpiece.

[0020] In the above process:

[0021] On the one hand, the position of the air inlet chamber is lower than that of the water inlet chamber, so that the distance from the air inlet chamber to the sand blasting port is shorter, and thus the pressure drop of the compressed air can be greatly reduced;

[0022] On the other hand,

[0023] The water inlet chamber is above and the air inlet chamber is below. Under the dual action of the gravity of the sand water and negative pressure adsorption, the sand water is more likely to flow downward, which is beneficial to improving the uniformity of the water curtain sprayed at the sand blasting port and achieving the effect of uniform sand blasting. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Structural schematic diagram of the two-fluid spray knife provided for the embodiment.

[0026] In the figure:

[0027] 1. Water inlet assembly; 101. Water inlet cavity; 102. Upper end channel;

[0028] 2. Water passing assembly; 201. Water passing cavity; 202. Water passing channel; 203. Lower end channel; 204. Mixing channel;

[0029] 3. Air inlet assembly; 301. Air inlet cavity; 302. Air blowing channel;

[0030] 4. Water knife nozzle; 401. Sandblasting port. Detailed implementation manners

[0031] In the present invention, referring to "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present invention. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it particularly limited to the independence or relevance with other embodiments. In principle, in the present invention, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0032] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which the present invention belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0033] In the description of the present invention, the phrase "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this article generally represents an "or" logical relationship between the associated objects before and after.

[0034] In the present utility model, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantitative, primary-secondary, or sequential relationship, etc. between these entities or operations.

[0035] Without further limitation, in the present utility model, the expressions such as "comprising", "including", "having", or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method, or product including the said elements. Thus, in a process, method, or product including a series of elements, it may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such a process, method, or product.

[0036] Similar to the understanding in the "Examination Guidelines", in the present utility model, expressions such as "greater than", "less than", "exceeding", etc. are understood as not including the present number; expressions such as "above", "below", "within", etc. are understood as including the present number. In addition, in the description of the embodiments of the present utility model, the meaning of "a plurality of" is two or more (including two). Similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in the same way, unless otherwise specifically defined.

[0037] In the description of the embodiments of the present utility model, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawing. It is only for the convenience of describing the specific embodiments of the present utility model or for the reader's understanding, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present utility model.

[0038] Unless otherwise clearly specified or limited, in the description of the embodiments of the present utility model, the terms such as "installed", "connected", "joined", "fixed", "set", etc. should be understood in a broad sense. For example, the said "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art to which the present utility model pertains, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0039] The present utility model provides a two-fluid spray knife, which is applicable to the application scenario of sandblasting operation, and can effectively solve the problem of excessive pressure drop caused by the long distance from the air inlet cavity to the sandblasting port.

[0040] See Figure 1 , the two-fluid spray knife includes a water inlet assembly 1, a water passing assembly 2, an air inlet assembly 3, and a water knife nozzle 4.

[0041] The water inlet assembly 1 is provided with a water inlet cavity 101. The water passing assembly 2 is located below the water inlet assembly 1 and is provided with a water passing cavity 201 whose upper part communicates with the water inlet cavity 101. The air inlet assembly 3 is located in the water passing cavity 201 and is provided with an air inlet cavity 301 that communicates downward with the bottom of the water passing cavity 201. Wherein, a water passing channel 202 that communicates the upper part of the water passing cavity 201 to the lower part of the water passing cavity 201 is formed between the outer wall of the air inlet assembly 3 and the inner wall of the water passing assembly 2. The water knife nozzle 4 is located below the air inlet assembly 3 and is provided with a sandblasting port 401 that communicates with the lower part of the water passing cavity 201.

[0042] For the two-fluid spray knife provided in this embodiment, during the sandblasting operation, sand water is fed into the water inlet cavity 101, and compressed air is fed into the air inlet cavity 301. The compressed air flows downward and enters the water knife nozzle 4 through the lower part of the water cavity 201. At this time, a low-pressure adsorption phenomenon is caused in the water passing cavity 201 by the high-speed air flow, so that the air flow in the water passing cavity 201 moves downward, and then the sand water in the water inlet cavity 101 is sucked downward into the water passing cavity 201; after the sand water is sucked into the water passing cavity 201, it flows downward through the water passing channel 202 to the water knife nozzle 4 to be mixed with the compressed air, and finally is sprayed out through the sandblasting port 401 to wash the surface of the workpiece.

[0043] In the above process:

[0044] On the one hand, the position of the air inlet cavity 301 is lower than that of the water inlet cavity 101, so that the distance from the air inlet cavity 301 to the sandblasting port 401 is shorter, thus greatly reducing the pressure drop of the compressed air;

[0045] On the other hand,

[0046] the water inlet cavity 101 is above and the air inlet cavity 301 is below. Under the dual action of the gravity of the sand water and negative pressure adsorption, the sand water is more likely to flow downward, which is beneficial to improving the uniformity of the water curtain sprayed out at the sandblasting port 401 and achieving the effect of uniform sandblasting.

[0047] In this embodiment, the water inlet assembly 1 is provided with an upper channel 102 extending downward from the bottom of the water inlet chamber 101, and the water passing assembly 2 is provided with a lower channel 203 extending upward from the top surface of the water passing chamber 201 to communicate with the upper channel 102. Among them, the diameter of the upper channel 102 is smaller than the diameter of the lower channel 203.

[0048] The two-fluid spray knife provided in this embodiment further optimizes the water flow path. Specifically, by reducing the diameter of the upper channel 102 and increasing the diameter of the lower channel 203, an accelerating effect is generated when the sand water flows downward. This design helps to improve the impact force when the sand water is ejected, further optimizing the sandblasting effect.

[0049] Optionally, the air inlet assembly 3 is further provided with a blowing channel 302 extending downward from the bottom of the air inlet chamber 301 to the bottom surface of the air inlet assembly 3, and the water passing assembly 2 is further provided with a mixing channel 204 communicating the bottom of the water passing chamber 201 to the sandblasting port 401. Further, the blowing channel 302 and the mixing channel 204 are on a straight line.

[0050] In the two-fluid spray knife of this embodiment, the blowing channel 302 and the mixing channel 204 are arranged on a straight line, which helps to reduce the resistance of the fluid during the flow process, further reduce the pressure drop of the compressed air, and improve the sandblasting effect.

[0051] In this embodiment, the number of the water inlet chambers 101 is two. Further, the two water inlet chambers 101 are symmetrically arranged with respect to the blowing channel 302.

[0052] The two-fluid spray knife in this embodiment is provided with two water inlet chambers 101, which can further increase the supply of sand water and meet the requirements of large-area sandblasting operations. At the same time, the symmetrical design of the double water inlet chambers 101 helps to balance the flow of sand water, improve the stability of the sandblasting effect, and make the sandblasting effect on the surface of the workpiece more uniform.

[0053] In summary, the two-fluid spray knife provided in this embodiment has the following advantages:

[0054] ① Reducing the pressure drop of the compressed air: Since the position of the air inlet chamber 301 is lower than that of the water inlet chamber 101, the distance from the air inlet chamber 301 to the sandblasting port 401 is shortened, significantly reducing the pressure drop of the compressed air and ensuring the stability of the sandblasting effect.

[0055] ② Improving the sandblasting uniformity: Under the dual action of the gravity of the sand water and the negative pressure adsorption, the sand water is more likely to flow downward, making the water curtain ejected from the sandblasting port 401 more uniform, achieving the effect of uniform sandblasting;

[0056] ③ Optimized the water flow path: By setting the upper channel 102 and the lower channel 203, and reducing the diameter size of the upper channel 102 and increasing the diameter size of the lower channel 203, the accelerated flow of sand and water is achieved, the impact force during sandblasting is increased, and thus the sandblasting effect is improved.

[0057] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the present application, the patent protection scope of the present application cannot be limited thereby. Any technical solutions obtained by equivalent structure or equivalent process substitution or modification based on the substantial concept of the present application and using the content recorded in the text and drawings of the present application, as well as those directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are all included in the patent protection scope of the present application.

Claims

1. A two-fluid spray knife, characterized in that, Including: An inlet water assembly (1), the inlet water assembly (1) being provided with an inlet water cavity (101); A water passing assembly (2), the water passing assembly (2) being located below the inlet water assembly (1) and being provided with a water passing cavity (201) with an upper part communicating with the inlet water cavity (101); An air inlet assembly (3), the air inlet assembly (3) being located in the water passing cavity (201) and being provided with an air inlet cavity (301) communicating downward to the bottom of the water passing cavity (201); wherein, a water passing channel (202) communicating the upper part of the water passing cavity (201) to the lower part of the water passing cavity (201) is formed between the outer wall of the air inlet assembly (3) and the inner wall of the water passing assembly (2); A water jet nozzle (4), the water jet nozzle (4) being located below the air inlet assembly (3) and being provided with a sand blasting port (401) communicating with the lower part of the water passing cavity (201).

2. The two-fluid spray knife according to claim 1, characterized in that, The inlet water assembly (1) is provided with an upper end channel (102) extending downward from the bottom of the inlet water cavity (101), and the water passing assembly (2) is provided with a lower end channel (203) extending upward from the top surface of the water passing cavity (201) to communicate with the upper end channel (102).

3. The two-fluid spray knife according to claim 2, characterized in that, The diameter size of the upper end channel (102) is smaller than the diameter size of the lower end channel (203).

4. The two-fluid spray knife according to claim 1, characterized in that, The air inlet assembly (3) is further provided with a blowing channel (302) extending downward from the bottom of the air inlet cavity (301) to the bottom surface of the air inlet assembly (3).

5. The two-fluid spray knife according to claim 4, characterized in that, The water passing assembly (2) is further provided with a mixing channel (204) communicating the bottom of the water passing cavity (201) to the sand blasting port (401).

6. The two-fluid spray knife according to claim 5, characterized in that, The blowing channel (302) and the mixing channel (204) are on a straight line.

7. The two-fluid spray knife according to claim 6, wherein, The number of the inlet water cavities (101) is two.

8. The two-fluid spray knife according to claim 7, wherein, The two inlet water cavities (101) are symmetrically arranged with respect to the blowing channel (302).

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