A self-oscillating vortex ring generator

Abstract

The present invention discloses a self-oscillating vortex ring generator, comprising a shell, a piezoelectric sheet, a liquid spray module and a deflector. The shell is a hollow cylinder with one end open and the other end closed. The piezoelectric sheet is arranged at the open end, and a through hole is arranged at the closed end. The liquid spray module is used to inject fluid into the shell. The deflector is arranged in the shell, and a plurality of circulation channels for generating circulation are arranged thereon. During operation, the fluid sprayed by the nozzle module is compressed by the piezoelectric sheet driven by the outside world, and is thus transported from the shell to the outlet. When the fluid flows in the mainstream direction, part of the fluid enters the symmetrically distributed annular flow channel, thereby forming a backflow to interfere with the mainstream. Due to the unevenness of the disturbance, the fluid at the outlet swings, thereby generating a vortex ring outside the through hole at the closed end of the shell, and maintaining the annular motion for a long time. The present invention improves the shortcoming that most vortex ring generators can only generate a vortex ring in front of the outlet, and utilizes the internal structure of the vortex ring generator itself to form a vortex ring within a certain range.

Description

Technical Field

[0001] The invention relates to the field of fluid mechanics, and in particular to a self-swinging vortex ring generator. Background Art

[0002] Vortex rings are a type of flow structure that is widely present in nature and engineering practice. Vortex ring structures exist in volcanic eruptions, biological movements, and helicopter flights. From the relevant knowledge of fluid mechanics, we know that compared with ordinary jets, vortex rings can better maintain their internal kinetic energy, so they can move longer distances. In recent years, people have conducted a lot of research on the structure and dynamic characteristics of vortex rings, and have used them in the fields of flow control, enhanced heat transfer and heat dissipation, mass transfer, noise reduction and deicing. However, most of the current vortex ring generators can only generate vortex rings directly in front of their outlets. Without the help of other conditions, the range of vortex rings generated by a single vortex ring generator is small, and this problem has been waiting to be solved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a self-swinging vortex ring generator in response to the defects involved in the background technology, which improves the shortcoming that most vortex ring generators can only generate vortex rings in front of the outlet. Without relying on external conditions, the internal structure of the vortex ring generator itself is utilized to form a vortex ring within a certain range.

[0004] The present invention adopts the following technical solutions to solve the above technical problems:

[0005] A self-oscillating vortex ring generator comprises a shell, a piezoelectric sheet, a liquid injection module and a deflector;

[0006] The shell is a hollow cylinder with one end open and the other end closed, and a through hole is provided at the center of the closed end surface for the fluid to flow out and form a vortex ring;

[0007] The deflector is a solid cylinder arranged in the shell, and its axial length is smaller than the axial length of the shell, one end face is in close contact with the closed end of the shell, and the side wall is in close contact with the inner wall of the shell; the deflector is provided with a flow channel along its axis, the cross section of the flow channel is circular, gradually becomes smaller from the open end to the closed end of the shell, and the cross section area of ​​the flow channel on the end face of the deflector close to the closed end of the shell is larger than the area of ​​the through hole on the closed end face of the shell;

[0008] The deflector body is evenly provided with N annular channels in the circumferential direction, where N is a natural number greater than or equal to 2; the annular channel and the axis of the deflector body are coplanar, and the inlet and outlet are both arranged on the wall of the flow channel, the inlet is located between the outlet and the closed end of the shell, and the angle between the inlet and the axis of the shell is in the range of 20°~50°, and the angle between the outlet and the axis of the shell is in the range of 40°~70°; the N annular channels are used to cause the fluid to form a backflow during the flow process, thereby interfering with the mainstream, so that the fluid at the through hole at the closed end of the shell swings;

[0009] The liquid spray module comprises M liquid spray units, and the M liquid spray units are equidistantly arranged on the side wall between the opening end of the shell and the deflector, where M is a natural number greater than or equal to 1; the liquid spray unit comprises K nozzles circumferentially uniformly arranged on the side wall of the shell; the liquid spray module is used to inject external fluid into the shell;

[0010] The piezoelectric sheet is arranged at the open end of the shell and is tightly connected to the shell. The piezoelectric sheet is connected to an external driving mechanism for reciprocating vibration and compressing the fluid injected into the shell to flow toward the through hole at the closed end of the shell.

[0011] As a further optimization scheme of the self-swinging vortex ring generator of the present invention, N is preferably 3, M is preferably 2, and K is preferably 5.

[0012] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0013] The invention discloses a self-swinging vortex ring generator. When working, the piezoelectric sheet shrinks toward the inside of the circular cylinder, compresses the fluid sprayed from the nozzle and transports it toward the outlet; the compressed fluid forms a mainstream in the shell, and during the movement of the fluid, part of the fluid enters the annular channel of the deflector to form a backflow, and the mutual interference between the mainstream and the backflow causes the fluid before the outlet to swing and finally spray out; there is still air around the through hole at the closed end of the shell and in front of the center, and due to the viscosity of the fluid and the pressure difference, and with the swing of the fluid in front of the through hole at the closed end of the shell, a vortex ring will be formed within a certain range on the left and right sides of the through hole at the closed end of the shell. Adjusting the size of the through hole at the closed end of the shell can adjust the area range for generating the vortex ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional schematic diagram of the present invention.

[0015] In the figure, 1-shell, 2-direction-changing body, 3-annular channel, 4-nozzle, 5-piezoelectric sheet. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings:

[0017] The present invention can be implemented in many different forms and should not be considered to be limited to the embodiments described herein. On the contrary, these embodiments are provided to make this disclosure thorough and complete, and will fully express the scope of the present invention to those skilled in the art. In the accompanying drawings, components are enlarged for clarity.

[0018] It should be understood that although the terms first, second, third, etc. can be used here to describe various elements, components and / or parts, these elements, components and / or parts are not limited by these terms. These terms are only used to distinguish elements, components and / or parts from each other. Therefore, the first element, component and / or part discussed below can become the second element, component or part without departing from the teaching of the present invention.

[0019] like Figure 1 As shown, a self-swinging vortex ring generator comprises a shell, a piezoelectric sheet, a liquid injection module and a deflector;

[0020] The shell is a hollow cylinder with one end open and the other end closed, and a through hole is provided at the center of the closed end surface for the fluid to flow out and form a vortex ring;

[0021] The deflector is a solid cylinder arranged in the shell, and its axial length is smaller than the axial length of the shell, one end face is in close contact with the closed end of the shell, and the side wall is in close contact with the inner wall of the shell; the deflector is provided with a flow channel along its axis, the cross section of the flow channel is circular, gradually becomes smaller from the open end to the closed end of the shell, and the cross section area of ​​the flow channel on the end face of the deflector close to the closed end of the shell is larger than the area of ​​the through hole on the closed end face of the shell;

[0022] The deflector body is evenly provided with N annular channels in the circumferential direction, where N is a natural number greater than or equal to 2; the annular channel and the axis of the deflector body are coplanar, and the inlet and outlet are both arranged on the wall of the flow channel, the inlet is located between the outlet and the closed end of the shell, and the angle between the inlet and the axis of the shell is in the range of 20°~50°, and the angle between the outlet and the axis of the shell is in the range of 40°~70°; the N annular channels are used to cause the fluid to form a backflow during the flow process, thereby interfering with the mainstream, so that the fluid at the through hole at the closed end of the shell swings;

[0023] The liquid spray module comprises M liquid spray units, and the M liquid spray units are equidistantly arranged on the side wall between the opening end of the shell and the deflector, where M is a natural number greater than or equal to 1; the liquid spray unit comprises K nozzles circumferentially uniformly arranged on the side wall of the shell; the liquid spray module is used to inject external fluid into the shell;

[0024] The piezoelectric sheet is arranged at the open end of the shell and is tightly connected to the shell. The piezoelectric sheet is connected to an external driving mechanism for reciprocating vibration and compressing the fluid injected into the shell to flow toward the through hole at the closed end of the shell.

[0025] The N is preferably 3, the M is preferably 2, and the K is preferably 5.

[0026] When the piezoelectric sheet moves toward the inside of the cylinder, it compresses the fluid injected by each nozzle and makes it flow toward the through hole at the closed end of the shell;

[0027] The compressed fluid forms a mainstream in the shell. During the movement of the fluid, part of the fluid enters the annular flow channel in the deflector body, thereby forming a backflow. The mutual interference between the mainstream and the backflow causes the fluid before the through hole at the closed end of the shell to swing, and finally spray out from the through hole at the closed end of the shell.

[0028] There is still air around the through hole at the closed end of the shell and in front of the center. Due to the viscosity of the fluid and the pressure difference, and with the swing of the fluid in front of the through hole at the closed end of the shell, a vortex ring will be formed within a certain range on the left and right sides of the through hole at the closed end of the shell. Adjusting the size of the through hole at the closed end of the shell can adjust the area where the vortex ring is generated.

[0029] The self-swinging vortex ring generator utilizes its internal structural characteristics to enable a single vortex ring generator to generate a vortex ring within the range of its left and right sides, which can solve the problem that most current vortex ring generators can only eject vortex rings in a single direction.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0031] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A self-swinging vortex ring generator, It is characterized in that It includes a shell, a piezoelectric sheet, a liquid spray module and a deflector; The shell is a hollow cylinder with one end open and the other end closed, and a through hole is provided at the center of the closed end surface for the fluid to flow out and form a vortex ring; The deflector is a solid cylinder arranged in the shell, and its axial length is smaller than the axial length of the shell, one end face is in close contact with the closed end of the shell, and the side wall is in close contact with the inner wall of the shell; the deflector is provided with a flow channel along its axis, the cross section of the flow channel is circular, gradually becomes smaller from the open end to the closed end of the shell, and the cross section area of ​​the flow channel on the end face of the deflector close to the closed end of the shell is larger than the area of ​​the through hole on the closed end face of the shell; The deflector body is evenly provided with N annular channels in the circumferential direction, where N is a natural number greater than or equal to 2; the annular channel and the axis of the deflector body are coplanar, and the inlet and outlet are both arranged on the wall of the flow channel, the inlet is located between the outlet and the closed end of the shell, and the angle between the inlet and the axis of the shell is in the range of 20° to 50°, and the angle between the outlet and the axis of the shell is in the range of 40° to 70°; the N annular channels are used to cause the fluid to form a backflow during the flow process, thereby interfering with the mainstream, so that the fluid at the through hole at the closed end of the shell swings; The liquid spray module comprises M liquid spray units, and the M liquid spray units are equidistantly arranged on the side wall between the opening end of the shell and the deflector, where M is a natural number greater than or equal to 1; the liquid spray unit comprises K nozzles circumferentially uniformly arranged on the side wall of the shell; the liquid spray module is used to inject external fluid into the shell; The piezoelectric sheet is arranged at the open end of the shell and is tightly connected to the shell. The piezoelectric sheet is connected to an external driving mechanism for reciprocating vibration and compressing the fluid injected into the shell to flow toward the through hole at the closed end of the shell.

2. The self-oscillating vortex ring generator according to claim 1, It is characterized in that The N is 3, M is 2, and K is 5.

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