JP2003080122A - Gorge section variable fluid nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid nozzle in which the sectional area of a gorge is variable. SOLUTION: The gorge section variable fluid nozzle is characterized in that the sectional area of the gorge can be changed by shifting both ends of a cylindrical sidewall composed of an elastic material along the circumference relative to each other. Also, the gorge section variable fluid nozzle is characterized in that the cylindrical sidewall is formed by embedding a core material made of a metal material or the like in a long and narrow member made of a polymer or the like. Also, the gorge section variable fluid nozzle is characterized in that the cylindrical sidewall composed of an elastic material is inserted inside the cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid nozzle, and more particularly to a variable throat cross-section fluid nozzle therein.

[0002]

2. Description of the Related Art Conventionally, a flow rate adjusting valve is often used to adjust the flow rate, and as such a flow rate adjusting valve, for example, a needle valve, a sluice valve, or a butterfly valve has been used. In addition, the nozzle that can adjust the flow rate had a fixed throat area. Also, in the ejector, the area of the throat portion of the nozzle is fixed.

[0003]

However, when a needle valve, a sluice valve, or a butterfly valve is used as the flow rate adjusting valve, any action of disturbing the flow is added, so that the flow is rectified in the wake portion of the valve. Had to use a rectifying grid. In addition, when a nozzle with a fixed throat area is used for flow rate adjustment, the application range of flow rate adjustment is narrow, and when it is desired to increase flow rate adjustment, products of different designs must be used.

In order to solve the above-mentioned problems of the prior art, it is an object of the present invention to provide a fluid nozzle having a variable throat cross-sectional area.

[0005]

In order to achieve the above object, the variable throat cross-section fluid nozzle of the present invention is formed by shifting the circumferential positions of both ends of a cylindrical side wall made of a material having elasticity. It is characterized in that the sectional area of the part is variable. Further, the throat section variable fluid nozzle of the present invention is characterized in that a cylindrical side wall is formed by burying a core material made of a metal material or the like in a strip-shaped member made of a material such as a polymer. Further, the variable throat cross-section fluid nozzle of the present invention is characterized in that a cylindrical side wall is formed by arranging a plurality of thin metal plates annularly so as to partially overlap in the circumferential direction. Further, the variable throat cross-section fluid nozzle of the present invention is characterized in that a cylindrical side wall made of an elastic material is inserted inside the cylindrical body. Further, the variable throat cross-section fluid nozzle of the present invention is characterized in that the positions of both ends of the cylindrical side wall in the circumferential direction can be displaced from the outside of the cylindrical body. Further, the throat section variable fluid nozzle of the present invention is applied to an ejector.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the fluid nozzle body 1, showing a state in which the nozzle cross-sectional area is maximum. In FIG. 1, reference numeral 2 denotes a cylindrical side wall formed by cylindrically forming a belt-shaped member made of an elastic material such as a polymer, and core materials 3 such as metal are embedded in the cylindrical side wall 2 at equal intervals. ing. Both ends of the cylindrical side wall 2 are joined to the annular members 4 and 4, and the core material 3 is fixed to the annular members 4 and 4.

The cylindrical fluid nozzle body 1 shown in FIG.
When it is twisted in the circumferential direction while holding the annular members 4 and 4 at both ends with the center as an axis, it becomes a nozzle shape having a throat portion 5 as shown in FIG. This nozzle shape is used as a nozzle. Since the fluid passes through the fluid nozzle body 1, the fluid nozzle body 1 is formed so as not to leak the fluid as a whole. FIG. 3 is a sectional view taken along the line AA in FIG. 1, and it can be seen that core materials 3 made of metal or the like are embedded at equal intervals in the elastic cylindrical side wall 2.

FIG. 4 shows another embodiment of the fluid nozzle main body 1, in which metal thin plates 6 having a relatively narrow width and the length of the nozzle main body 6 ... The metal thin plates 6 are joined to the annular members 4 and 4 by arranging them in a circular shape to form cylindrical side walls. In this case, since a groove having the thickness of the metal thin plate 6 is formed inside the metal thin plates 6 ..., The elastic cylindrical inner wall 7 is arranged inside the metal thin plates 6 as necessary to seal the fluid. To be done completely.

FIG. 5 shows an example in which the fluid nozzle body 1 is fitted in the cylindrical body 8. A cylindrical member 9 is connected to one end of the fluid nozzle body 1, for example, the downstream side. At this time, a seal is provided between the annular members 4, 4 and the cylindrical member 9 and the cylindrical body 8 to prevent fluid leakage. Further, as shown in FIG. 6, a protrusion 10 is provided on the cylindrical member 9 and the protrusion 10 is fitted into a guide groove 11 provided on the cylindrical body 8. Since the guide groove 11 guides the protrusion 10 when the fluid nozzle body 1 is twisted about its center, as shown in FIG. 5, the spiral having a pitch that allows the protrusion 10 to move smoothly. It is formed into a shape.

Therefore, one annular member 4 of the fluid nozzle body 1 is fixed so as not to rotate, and the other annular member 4 is fixed.
When the protrusion 10 provided on the cylindrical member 9 extended from and connected to is moved along the guide groove 11, the other annular member 4 moves in the axial direction while rotating in the circumferential direction,
The diameter of the throat portion 5 can be adjusted.

FIG. 7 shows still another embodiment, which is an example in which the ejector used in an air conditioner or the like is used as a nozzle for accelerating the fluid. The fluid nozzle main body 1 is arranged in the ejector portion of the cylindrical body 8 in which the drive flow introducing member 12 is provided on the upstream side and the driven flow introducing member 13 is provided orthogonal to the drive flow introducing member 12 to form an ejector. Figure 5
In the same manner as that shown in FIG. 3, one of the annular members 4 of the fluid nozzle main body 1 is fixed so as not to rotate, and the protrusion 10 provided on the cylindrical member 9 extended from the other annular member 4 and connected thereto. Is moved along the guide groove 11, the other annular member 4 moves in the axial direction while rotating in the circumferential direction, and the diameter of the throat portion 5 can be adjusted. Since the cross-sectional area of the throat portion of the fluid nozzle body 1 can be made variable in this manner, it is possible to provide an ejector with high ejector efficiency and a wide operating range.

[0012]

As described above, in the variable throat cross-section fluid nozzle according to the present invention, the cross-sectional area of the throat can be changed by shifting the relative position of the nozzle end faces. A conditioning device is obtained. Further, according to the throat section variable fluid nozzle according to the present invention,
The minimum cross-sectional area in the axial direction of the cylindrical direction can be throttled and expanded while smoothly changing the cross-sectional area in the axial direction, and the flow rate can be controlled with less pressure loss as compared with the conventional valve. Furthermore, when the variable throat cross-section fluid nozzle according to the present invention is used as a supersonic nozzle, it is possible to control the mass flow rate by reducing the generation of shock waves and expansion that are likely to occur from protrusions, etc. It is possible to manufacture a supersonic wind tunnel that creates a flow according to it.

[Brief description of drawings]

FIG. 1 is a perspective view of a fluid nozzle body according to an embodiment of the present invention, showing a state where a cross-sectional area is maximum.

FIG. 2 is a perspective view of the fluid nozzle body according to the embodiment of the present invention, showing a state in which the relative positions of the nozzle end faces are shifted to reduce the cross-sectional area.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view showing another embodiment of the fluid nozzle body.

FIG. 5 is a diagram showing an entire fluid nozzle.

6 is a diagram showing a relationship between a protrusion and a groove in FIG.

FIG. 7 is a diagram showing an example in which a fluid nozzle is applied to an ejector.

[Explanation of symbols]

1 Fluid nozzle body 2 Cylindrical side wall 3 core material 4 annular member 5 throat 6 thin metal plates 7 Cylindrical inner wall 8 cylinder 9 Cylindrical member 10 protrusions 11 grooves 12 Drive flow introduction member 13 Driven flow introduction member

Claims (6)

[Claims] 1. A throat section variable fluid nozzle characterized in that the throat section cross-sectional area is made variable by shifting the circumferential positions of both ends of a cylindrical side wall made of a material having elasticity. 2. The variable throat cross-section fluid nozzle according to claim 1, wherein a cylindrical side wall is formed by burying a core material made of a metal material or the like in a strip-shaped member made of a material such as a polymer. 3. The variable throat cross-section fluid nozzle according to claim 1, wherein the cylindrical side wall is formed by arranging a plurality of thin metal plates annularly so as to partially overlap each other in the circumferential direction. 4. The variable throat cross-section fluid nozzle according to claim 1, wherein a cylindrical side wall made of a material having elasticity is inserted inside the cylindrical body. 5. The throat portion according to claim 1, wherein the circumferential positions of both ends of the cylindrical side wall can be displaced from the outside of the cylindrical body. Variable cross-section fluid nozzle. 6. A variable throat cross-section fluid nozzle according to any one of claims 1 to 5, which is applied to an ejector.