Gas discharge nozzle

Abstract

The system is designed to discharge a sufficiently large and high-speed volume of high-pressure gas relative to the external supply, while also achieving high levels of directivity in the discharge direction, high efficiency in discharge volume, and low noise levels. [Solution] The gas discharge nozzle 10 has a housing structure with a rectangular opening 3 on its front surface, and has an introduction section 4 and a communication section 5 inside, and is equipped with an extension surface 6, a lid inclined surface 7, and an introduction hole 8. The communication section 5 is formed between two parallel planes 11 and 2 12 that sandwich a central axis CL along the front-rear direction in the height direction, and has a narrowed section 5A in the middle of the front-rear direction that is perpendicular to the central axis CL and has the smallest cross-sectional area, and consists of a reducing section 5B in which the cross-sectional area decreases from the introduction section 4 toward the narrowed section 5A, and an expanding section 5C in which the cross-sectional area increases from the narrowed section 5A toward the opening 1.

Description

Technical Field

[0001] This invention relates to a gas discharge nozzle for discharging gas in a flat plate shape.

Background Art

[0002] As a method for removing foreign matter adhering to the surface of an article in a manufacturing process, a gas discharge nozzle that discharges a high-pressure gas such as compressed air onto the surface of the conveyed object is used. For example, compressed air supplied from a supply device such as a pump or a compressor is sprayed in a high-pressure state from a gas discharge nozzle called an air knife during the conveyance of a washed cylindrical container to remove moisture from a predetermined area of the container (see, for example, Patent Document 1).

[0003] In order to reliably remove foreign matter from the surface of an article by spraying the high-pressure gas discharged from the gas discharge nozzle, it is necessary to spray a large amount of gas onto the surface of the article at a sufficient speed. Since the required gas flow rate and flow velocity for reliably removing foreign matter from the surface of an article vary depending on the shape of the article and the type of foreign matter, a gas discharge nozzle for removing foreign matter from the article surface is required to have the performance of discharging a large amount and high speed of gas.

[0004] On the other hand, a gas discharge nozzle used for the purpose of removing foreign matter adhering to the surface of an article in a manufacturing process in a manufacturing apparatus, a conveying apparatus, etc. is attached to a limited location of the manufacturing apparatus, so it is not only small-sized, but also high directivity in the gas discharge direction is required. In addition, in order to reduce power consumption, it is necessary to increase the efficiency so that the ratio of the supply amount to the discharge amount of gas is as small as possible, and further, it is also required to reduce the volume during discharge for the comfort of the manufacturing environment.

[0005] Therefore, the applicant has previously proposed a gas discharge nozzle that can discharge a sufficiently large amount and high speed of high-pressure gas with respect to the supply amount from the outside, and can achieve all of high directivity in the discharge direction, high efficiency of the discharge amount, and low noise of the discharge sound at a high level (see Patent Document 2).

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Application Publication No. 6-171635 [Patent Document 2] Japanese Patent Publication No. 2022-176088 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, conventional gas discharge nozzles have not been able to achieve high levels of directivity in the discharge direction, high efficiency of discharge volume relative to supply volume, and low noise levels while also being able to discharge high-pressure gas over a wide area in the width direction.

[0008] The objective of this invention is to provide a gas discharge nozzle that can discharge a sufficiently large amount of high-pressure gas at high speed over a wide area in the width direction relative to the amount supplied from an external source, while achieving high levels of directivity in the discharge direction, high efficiency in discharge volume, and low noise in discharge sound. [Means for solving the problem]

[0009] The gas discharge nozzle of this invention comprises a housing with an opening, a canopy, a plurality of small nozzle sections, and a confluence section. The opening has a rectangular opening that is open to the front of the housing and comprises a first surface and a second surface that are arranged parallel to each other at a first interval from both long sides of the opening toward the interior of the housing. The canopy extends forward of the opening, continuous with either the first surface or the second surface. The plurality of discharge sections are arranged side by side along the longitudinal direction of the opening inside the housing. The confluence section is a space located between the entire longitudinal area of ​​the opening and the plurality of small nozzle sections.

[0010] Each of the multiple small nozzle sections is equipped with a discharge section, an inlet section, and a connecting section. The discharge section is open to the confluence section. The inlet section has an inlet hole through which high-pressure gas is introduced from outside the housing. The connecting section is formed between the discharge section and the inlet section along the front-to-back direction of the housing and has a constricted section in the middle of the front-to-back direction where the cross-sectional area perpendicular to the front-to-back direction is smallest, a reducing section where the cross-sectional area gradually decreases from the inlet section toward the constricted section, and an expanding section where the cross-sectional area gradually increases from the constricted section toward the discharge section.

[0011] In each of the multiple small nozzle sections, the high-pressure gas introduced from the outside through the inlet hole is pressurized in the constricted section and then depressurized in the expanding section as it passes through the communication section to the discharge section. The high-pressure gas is accelerated as it passes through the constricted section, merged at the confluence section, and then discharged from the opening to the front side of the housing. The high-pressure gas discharged in large quantities at high speed and low volume from the discharge section of each of the multiple small nozzle sections to the confluence section is homogenized at the confluence section and then discharged in a flat plate shape without diffusion in the long and short sides of the opening, due to restrictions imposed by the opening and the overhang section. [Effects of the Invention]

[0012] According to this invention, it is possible to discharge a sufficiently large amount of high-pressure gas at high speed over a wide area in the width direction, while achieving high levels of directivity in the discharge direction, high efficiency in discharge volume, and low noise in discharge sound. [Brief explanation of the drawing]

[0013] [Figure 1] (A) and (B) are a front and rear perspective view of a gas discharge nozzle according to the first embodiment of the present invention. [Figure 2] This is a fractured exploded view of one end of the same gas discharge nozzle. [Figure 3] (A) and (B) are cross-sectional views of gas discharge nozzles according to the first and second embodiments of the present invention. [Figure 4] This is a perspective view of a component constituting a gas discharge nozzle according to a third embodiment of the present invention. [Figure 5] This is an assembly drawing of a gas discharge nozzle according to a third embodiment of the present invention. [Modes for carrying out the invention]

[0014] Below, a gas discharge nozzle and a conveying device according to an embodiment of this invention will be described with reference to the drawings.

[0015] As shown in Figures 1(A) and (B), the gas discharge nozzle 10 according to the first embodiment of this invention has a long, slender housing structure made of a material that does not easily deform, such as metal or resin. The gas discharge nozzle 10 consists, for example, of a main body 1, a lid 2, and a base 3. The lid 2 is joined to the upper surface of the main body 1 on its lower surface, and the base 3 is joined to the lower surface of the main body 1 on its upper surface, by a plurality of screws or adhesives (not shown), or by welding or other appropriate methods. In the gas discharge nozzle 10 according to the first embodiment, the main body 1, the lid 2, and the base 3 constitute the housing of this invention. For example, the main body 1, the lid 2, and the base 3 can be integrally formed using a 3D printer.

[0016] On the front side of the lid 2, a canopy portion 21 is formed that extends forward from the front of the main body 1 and the base 3 along its entire length. On the front side of the main body 1, a flat rectangular opening 110 is formed below the canopy portion 21, extending approximately along its entire length. On the back of the base 3, as an example, a total of four piping holes 31 are opened at equal intervals along the length.

[0017] As shown in Figures 2 and 3(A), the base 3 of the gas discharge nozzle 10 is the same length as the main body 1 in the front-rear direction, while the lid 2 is longer than the main body 1 by the amount of the overhang 21. The main body 1 has an opening 11, a confluence 12, and multiple discharge sections 13 formed by recessing from the upper surface 17, extending from front to rear. The opening 11 forms a flat rectangular opening on the front surface of the main body 1, extending almost the entire length of the main body 1 in the direction of arrow X, between the front end of the lower surface of the lid 2 and the opening 11. The confluence 12 is formed between the multiple discharge sections 13 and the opening 11, extending the entire length of the opening 11 in the direction of arrow X.

[0018] The plurality of ejection parts 13 are arranged at equal intervals along the direction of arrow X. Each ejection part 13 includes an introduction part 131, a reduction part 132, a narrowing part 133, and an enlargement part 134 in this order from the rear to the front of the main body 1. The introduction part 131 is formed to communicate with three adjacent ejection parts 13 as an example, and high-pressure gas is introduced through introduction holes 1311 provided in twos for every three ejection parts 13. The reduction part 132 and the enlargement part 134 are each composed of two side surfaces 132a, 132b and two side surfaces 134a, 134b that are planes, and the cross-sectional area orthogonal to the front-rear direction of the main body 1 is shaped to gradually decrease from the rear to the front of the main body 1, reach the minimum at the narrowing part 133, and then gradually increase. The reduction part 132, the narrowing part 133, and the enlargement part 134 are shaped such that the contact resistance of the high-pressure gas is minimized.

[0019] That is, the reduction part 132 is inclined such that two side surfaces 132a, 132b composed of planes facing each other gradually approach from the rear to the front of the main body 1. The enlargement part 134 is inclined such that two side surfaces 134a, 134b composed of planes facing each other gradually separate from the rear to the front of the main body 1. The narrowing part 133 is located at the intersection of each of the two side surfaces of the reduction part 132 and the two side surfaces of the enlargement part 134.

[0020] As an example, the rear sides of the introduction part 131, the reduction part 132, the narrowing part 133, and the enlargement part 134 are formed at an interval of 1.5 mm between the lower surface 22 of the lid body 2 and the first surface 14 of the main body 1. The front side of the enlargement part 134 and the confluence part 12 are formed at an interval of 0.5 mm between the lower surface 22 of the lid body 2 and the second surface 15 of the main body 1. The opening part 11 is formed at an interval of 0.06 mm between the lower surface 22 of the lid body 2 and the third surface 16 of the main body 1.

[0021] The base 3 has a chamber portion 32 formed by being recessed from the upper surface 33. The chamber portion 32 has communication holes 321 communicating with the respective piping holes 31 on the back surface of the base 3. The chamber portion 32 has a length that faces the introduction portions 131 of the discharge portions 13 located at both ends among the plurality of discharge portions 13 of the main body 1 in the arrow X direction. A piping connected to a pump (not shown) is attached to the piping hole 31 of the base 3. High-pressure gas pressurized by the pump is supplied into the base 3 through the piping attached to the piping hole 31. The piping holes 31 are formed at four locations at equal intervals as an example in the arrow X direction of the base 3.

[0022] The high-pressure gas supplied into the base 3 flows into the chamber portion 32 from the communication holes 321 so as to have a uniform pressure in the arrow X direction within the chamber portion 32. The number of the piping holes 31 in the arrow X direction of the base 3 is determined so that the pressure of the high-pressure gas is uniform in the arrow X direction within the chamber portion 32. The high-pressure gas flowing into the chamber portion 32 continuously flows into the introduction portion 131 via the introduction hole 1311 in the main body 1.

[0023] When the high-pressure gas is continuously introduced into the introduction portion 131 via the introduction hole 1311, the high-pressure gas passes through the narrowing portion 132, the constriction portion 133, and the expanding portion 134 and is discharged forward from the opening 11. At this time, in each of the plurality of discharge portions 13 in the main body 1, the high-pressure gas is pressurized by the narrowing portion 132 before reaching the constriction portion 133, then depressurized and accelerated by the expanding portion 134, and merges at the merging portion 12. The high-pressure gas flowing out at high speed from each of the plurality of discharge portions 13 is equalized in pressure at the merging portion 12 formed over the entire region in the arrow X direction at the opening 11, and is uniformly discharged from the flat rectangular opening 110 over the entire region in the arrow X direction. The high-pressure gas discharged from the opening 110 forms a laminar flow along the lower surface 22 of the lid body 2 in the shielding portion 21, and is discharged in a plate shape over a long range in the front in the entire region in the arrow X direction of the opening 110.

[0024] As a result, the gas discharge nozzle 10 can discharge a large amount of high-pressure gas at high speed in a laminar flow pattern, compared to the amount supplied from the supply device. This allows for high directivity of the discharged high-pressure gas and suppresses noise generation due to the diffusion of the high-pressure gas, providing a comfortable working environment. The effect of discharging a large amount of high-pressure gas at high speed in a laminar flow pattern, compared to the amount supplied from the supply device, cannot be achieved simply by arranging multiple discharge sections 13 in parallel in the direction of arrow X in the opening 11. It can only be achieved by providing a confluence section 12 across the entire area in the direction of arrow X in the opening 11.

[0025] The gas discharge nozzle 100 according to the second embodiment shown in Figure 3(B) has an opening 11, a confluence section 12, and a plurality of discharge sections 13 formed in the lid 102, and the chamber section 32 of the base 103 is omitted, with the piping hole 31 directly connected to the introduction section 131 via a communication hole 321. This allows the main body 1 to be omitted, making the gas discharge nozzle 100 thinner.

[0026] The gas discharge nozzle 200 according to the third embodiment shown in Figures 4 and 5 comprises the following components: main bodies 201A and 201B for both ends, main body 201C for the middle section, lids 202A and 202B for both ends, lid 202C for the middle section, bases 203A and 203B for both ends, piping base 203C for the middle section, and a base without piping 203D for the middle section.

[0027] Each of the main bodies 201A, 201B, and 201C has three discharge sections 13 and two inlet holes 1311. Each component is made to a length such that the discharge sections 13 are equally spaced when the main bodies 201A, 201B, and 201C are connected in the direction of arrow X. The bases 203A and 203B, the piping base 203C, and the non-piping base 203D have chamber sections 32 that are continuous when the piping base 203C or the non-piping base 203D is connected between the bases 203A and 203B in the direction of arrow X. The piping base 203C is equipped with a piping hole 31 and a communication hole 321.

[0028] As shown in Figure 5, by appropriately combining and arranging each component, it is possible to easily accommodate changes in the required high-pressure gas discharge width in the X direction. Specifically, in the X direction, n main bodies 201C are placed between main body 201A and main body 201B, n lids 202C are placed between lid 202A and lid 202B, and n piping bases 203C and non-piping bases 203D are alternately placed between base 203A and base 203B, and these components are joined to each other.

[0029] It should be noted that the above embodiments are merely examples, and this invention is not limited to these; various modifications can be made within the scope of this invention. [Explanation of Symbols]

[0030] 1-Main unit 2- Lid 3-Base 10. Nozzle for gas discharge 11-Opening 12-Confluence 13-Discharge part 110-Aperture 131-Introduction 132-reduction part 133-Stenosis 134 - Enlarged section

Claims

1. The housing has a rectangular opening on the front surface, and a first surface and a second surface arranged parallel to each other at a first interval from both long sides of the opening toward the interior of the housing; a canopy portion extending forward of the opening, continuous with either the first surface or the second surface; a plurality of discharge portions arranged side by side along the longitudinal direction of the opening inside the housing; and a confluence portion which is a space located between the entire longitudinal area of ​​the opening and the plurality of discharge portions. Each of the plurality of discharge sections is a gas discharge nozzle comprising, in order, an introduction section having an introduction hole into which high-pressure gas is introduced from outside the housing, a narrowing section in which the cross-sectional area perpendicular to the front-rear direction of the housing gradually decreases, a constricting section where the cross-sectional area is at its minimum, and an expanding section where the cross-sectional area gradually increases, extending from the rear to the front of the housing.

2. The gas discharge nozzle according to claim 1, wherein the reduced portion is formed between either the first or the second surface and a third surface parallel thereto and having a second spacing wider than the first spacing, and the expanded portion and the confluence portion are formed between either the first or the second surface and a fourth surface parallel thereto and having a third spacing wider than the first spacing and having a second spacing narrower than the second spacing.

3. The gas discharge nozzle according to claim 1 or 2, comprising a single chamber section to which high-pressure gas is supplied from outside the housing, and the single chamber section communicating with all of the inlet holes of the plurality of small nozzle sections.

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