NOZZLE

Abstract

Turbulence of the jet ejected from the nozzle hole is suppressed. The nozzle includes a shaft body having a center axis, a liquid guide path located inside the shaft body and extending along the center axis, a liquid chamber disposed at a distal end portion of the liquid guide path the liquid chamber having a nozzle hole. The nozzle hole is located at the distal end portion of the liquid chamber, extending along the ejection axis that extends in a direction different from the center axis. The nozzle has an inlet portion having a smaller diameter toward the downstream, and a guide portion connected to the downstream of the inlet portion to guide the liquid to an opening.

Claims

1. A nozzle, comprising: a shaft body having a center axis; a liquid guide path located inside the shaft body, the liquid guide path extending along the center axis; a liquid chamber disposed at a distal end portion of the liquid guide path, the liquid chamber having a nozzle hole located at a distal end portion of the liquid chamber, the nozzle hole extending along an ejection axis that is different direction from the center axis, the nozzle hole having an inlet portion connected to the liquid chamber, the inlet portion having a smaller diameter toward the downstream, and a guide portion connected to the downstream of the inlet portion to guide liquid to an opening.

2. The nozzle according to claim 1, wherein the inlet portion has a cross-section of curved convex toward radially inward.

3. The nozzle according to claim 1, wherein the inlet portion has a truncated conical shape.

4. The nozzle according to claim 3, wherein the inlet portion has an apex angle of 10 degrees to 60 degrees.

5. The nozzle according to claim 1, wherein the guide portion has a cylindrical shape.

6. The nozzle according to claim 1, wherein the liquid chamber has an inlet plane perpendicular to the ejection axis, and the inlet portion is located on the inlet plane.

7. The nozzle according to claim 1, wherein the shaft body includes an outlet plane perpendicular to the ejection axis, and the opening is located on the outlet plane.

8. The nozzle according to claim 1, further comprising: a plurality of the liquid chambers; wherein each of the liquid chamber has the single nozzle hole.

9. The nozzle according to claim 1, wherein the shaft body is cylindrical, and the nozzle hole extends perpendicularly to the center axis.

10. The nozzle according to claim 8, wherein the plurality of nozzle holes are circumferentially located at equal intervals.

11. The nozzle according to claim 8, further comprising: a plate partitioning into a plurality of the liquid chambers.

12. The nozzle according to claim 1, wherein a height of the ejection axis from a bottom of the liquid chambers is 0.5 to 2 times a diameter of the opening.

13. The nozzle according to claim 2, wherein the guide portion has a cylindrical shape.

14. The nozzle according to claim 3, wherein the guide portion has a cylindrical shape.

15. The nozzle according to claim 4, wherein the guide portion has a cylindrical shape.

16. The nozzle according to claim 2, wherein the liquid chamber has an inlet plane perpendicular to the ejection axis, and the inlet portion is located on the inlet plane.

17. The nozzle according to claim 3, wherein the liquid chamber has an inlet plane perpendicular to the ejection axis, and the inlet portion is located on the inlet plane.

18. The nozzle according to claim 4, wherein the liquid chamber has an inlet plane perpendicular to the ejection axis, and the inlet portion is located on the inlet plane.

19. The nozzle according to claim 5, wherein the liquid chamber has an inlet plane perpendicular to the ejection axis, and the inlet portion is located on the inlet plane.

20. The nozzle according to claim 2, wherein the shaft body includes an outlet plane perpendicular to the ejection axis, and the opening is located on the outlet plane.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a perspective view of nozzle according to a first embodiment.

[0025] FIG. 2 is a longitudinal sectional view of the nozzle according to the first embodiment.

[0026] FIG. 3 is a perspective view of the nozzle according to the second embodiment.

[0027] FIG. 4 is a longitudinal sectional view of the nozzle according to the second embodiment.

[0028] FIG. 5 is a V-V cross-sectional view in FIG. 4.

[0029] FIG. 6 is a partial cross-sectional perspective view of the nozzle according to the third embodiment.

[0030] FIG. 7 is a longitudinal sectional view of the nozzle according to the third embodiment.

[0031] FIG. 8 is a VIII-VIII cross-sectional view in FIG. 7.

DETAILED DESCRIPTION

First Embodiment

[0032] As shown in FIGS. 1 and 2, the nozzle 100 according to the present embodiment includes a shaft body 102, a liquid guide path 104, a liquid chamber 106, and a nozzle hole 108.

[0033] The shaft body 102 extends along a shaft center axis (center axis) 127. The shaft body 102 is a stepped cylinder. The shaft body 102 has a basal end portion having a larger diameter than a distal end portion. For example, the basal end portion of the shaft body 102 has an outer diameter of 6 mm to 12 mm.

[0034] The liquid guide path 104, which is disposed inside the shaft body 102, extends along the center axis 127. The liquid guide path 104 has a circular cross-section. The liquid guide path 104 has a reduced diameter portion 105. The reduced diameter portion 105, which is located at a distal end of the liquid guide path 104, is a conical shape that decreases in diameter toward the downstream. For example, the liquid guide path 104 has an inner diameter of 4 mm to 10 mm. For example, the liquid guide path 104 has a length of 50 mm to 300 mm.

[0035] The liquid chamber 106, which is connected to the reduced diameter portion 105, extends along the center axis 127. The liquid chamber 106 has a cylindrical shape. The liquid chamber 106 has a diameter smaller than the liquid guide path 104. The liquid chamber 106 has a bottom portion 114 at a downstream end. The bottom portion 114 includes a convex portion 115 formed in a conical shape toward the basal end direction. For example, the liquid chamber 106 has an inner diameter of 2 mm to 5 mm. The liquid chamber 106 has a length of 40 mm to 100 mm.

[0036] The nozzle hole 108 is located at the distal end portion of the liquid chamber 106. The nozzle hole 108 extends along an ejection axis 122. The nozzle hole 108 has a circular cross-section having a center at any location of the ejection axis 122. The nozzle hole 108 has an inlet portion 110, a guide portion 112, and an opening 113. An axial height 120 is equal to an opening diameter 118. For example, the opening diameter 118 is 0.9 mm to 1.3 mm.

[0037] The inlet portion 110 is connected to the liquid chamber 106. The inlet portion 110 does not contact the bottom portion 114. The inlet portion 110 has a shape having a smaller diameter toward the downstream. The inlet portion 110 has, for example, a truncated conical shape. A length 126 of the inlet portion is, for example, one-third of the opening diameter 118.

[0038] The guide portion 112 is located the downstream of the inlet portion 110. The guide portion 112 is cylindrical. The length 124 of the guide portion is, for example, 1.25 times the length 126 of the inlet portion.

[0039] The opening 113 is an opening located on the outer surface of the shaft body 102.

[0040] The liquid flowing into the nozzle 100 passes through the liquid guide path 104, the liquid chamber 106, and the nozzle hole 108, and is ejected from the opening 113. The nozzle 100 produces a linear jet. The inlet portion 110 gradually reduces the diameter from the liquid chamber 106 toward the guide portion 112. As a result, the turbulence of the streamlines due to the rapid reduction in the diameter of the nozzle hole 108 is suppressed to improve the linearity of the jet.

Second Embodiment

[0041] As shown in FIGS. 3, 4 and 5, the nozzle 200 according to the present embodiment includes a shaft body 202, a liquid guide path 104, a liquid chamber 206, a plate 228, and nozzle holes 208a, 208b.

[0042] The shaft body 202 extends along center axis 127. The shaft body 202 has a cylindrical shape. For example, the shaft body 202 has an outer diameter of 5 mm to 8 mm.

[0043] The liquid guide path 104 is located inside the shaft body 202.

[0044] The liquid chamber 206, which is disposed at the distal end of the liquid guide path 104, extends along the center axis 127. The liquid chamber 206 has a bottom portion 214.

[0045] The plate 228 extends from the bottom portion 214 along the center axis 127. The plate 228 is a column having a plane 230 extending along the center axis 127. The plate 228 partitions the liquid chamber 206 into a first liquid chamber 206a and a second liquid chamber 206b. Each plane 230 faces the first liquid chamber 206a and the second liquid chamber 206b, respectively. A plate length 238 is, for example, four times the opening diameter 118. A plate width 234 is, for example, one-sixth of a liquid chamber diameter 116. The first liquid chamber 206a and the second liquid chamber 206b are symmetrical with respect to the center axis 127. For example, the liquid chamber 206 has an inner diameter of 3 mm to 6 mm. The opening diameter 118 is 0.5 mm to 2.0 mm. The plate width 234 is 0.5 mm to 1 mm. The plate length 238 is 5 mm to 10 mm.

[0046] A nozzle hole (first nozzle hole) 208a is located at a distal end portion of the first liquid chamber 206a. The nozzle hole 208a has an inlet portion 210a. The inlet portion 210a is connected to the first liquid chamber 206a. The inlet portion 210a is a truncated cone having an apex angle 236. The apex angle 236 is, for example, 60 degrees.

[0047] A nozzle hole (second nozzle hole) 208b is located at a distal end portion of the second liquid chamber 206b. The nozzle hole 208b is substantially identical to the nozzle hole 208a.

[0048] The nozzle holes 208a, 208b each has a circular shape having a center at the ejection axis 122.

[0049] Since the plate 228 partitions the liquid chamber 206 into the first liquid chamber 206a and the second liquid chamber 206b, it is possible to suppress disturbance of the liquid in the liquid chamber caused by the liquid ejected from the nozzle holes 208a, 208b entraining the air in the nozzle holes 208a, 208b. As a result, turbulence of the liquid ejected from the nozzle holes 208a, 208b is suppressed to improve the linearity of the jet flow.

Third Embodiment

[0050] As shown in FIGS. 6, 7 and 8, the nozzle 300 according to the present embodiment includes a shaft body 302, a liquid guide path 104, a step 340, a liquid chamber 306, and nozzle holes 308a, 308b. The shaft body 302 extends along the center axis 127. The shaft body 302 has outlet planes 342a, 342b. The outlet planes 342a, 342b are cut out of the outer shape of the shaft body 302. The outlet planes 342a, 342b are symmetrical about the center axis 127. The outlet planes 342a, 342b are perpendicular to the ejection axis 122.

[0051] The liquid guide path 104 has a step 340. The step 340, which is disposed at a distal end of the liquid guide path 104, forms a part of the outer shape of the liquid guide path 104. The step 340 connects the liquid guide path 104 and the liquid chamber 306 so that the cross-sectional area decreases toward the downstream.

[0052] The liquid chamber 306, which is disposed at the distal end portion of the liquid guide path 104, extends along the center axis 127. The liquid chamber 306 has a bottom portion 314 and inlet planes 344a, 344b. The bottom portion 314 is planar. The inlet planes 344a, 344b connect to the step 340. The inlet planes 344a, 344b are symmetrical with respect to the center axis 127. The inlet planes 344a, 344b are perpendicular to the ejection axis 122.

[0053] The nozzle holes 308a, 308b are substantially identical to the nozzle holes 108. The upstream end of the nozzle hole 308a is connected to the inlet plane 344a. The downstream end of the nozzle hole 308a is connected to the outlet plane 342a.

[0054] The nozzle hole 308b is connected to the inlet plane 344b and the outlet plane 342b. The nozzle hole 308b is substantially identical to the nozzle hole 308a.

[0055] The outlet planes 342a, 342b make an amount of air entering from around the openings 313a, 313b uniform. Also, the inlet planes 344a, 344b and the outlet planes 342a, 342b equalize the axial length of the nozzle holes 308a, 308b in the circumferential direction. As a result, the turbulence of the liquid ejected from the nozzle holes 308a, 308b is suppressed to improve the linearity of the jet flow.

[0056] When the bottom portion 314 is configured as a flat surface, the streamlines of the liquid in the liquid chamber 306 are aligned. Therefore, the turbulence in the nozzle holes 308a, 308b is suppressed to improve the linearity of the jet flow.

[0057] It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention, and all technical matters included in the technical idea described in the claims are the target matter of the present invention. While the foregoing embodiments illustrate preferred examples, those skilled in the art will appreciate that various alternatives, modifications, variations, or improvements may be made in light of the teachings disclosed herein and are within the scope of the appended claims.

REFERENCE SIGNS LIST

[0058] 100 Nozzle [0059] 102 Shaft body [0060] 104 Liquid guide path [0061] 106 Liquid chamber [0062] 108 Nozzle hole [0063] 110 Inlet portion [0064] 112 Guide portion [0065] 113 Opening