JP4157630B2 - Injection nozzle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ejection nozzle capable of changing a fluid ejection pattern.
[0002]
[Prior art]
Conventionally, there are some spray nozzles such as a hose nozzle and a gun nozzle that can change a fluid spray pattern. FIG. 4 shows an example of a gun nozzle that injects high-pressure water. In this gun nozzle, an adjustment joint 34 is attached to a grip 32 provided with a flow path 31 via a valve seat 33, and an adjustment nut 35 is screwed onto the outer periphery of the adjustment joint 34. A nozzle tip 36 is attached to the tip of the cap with a cap nut 37. A valve element 39 urged by a coil spring 38 is pressed against the valve opening of the valve seat 33, and the valve element 39 is actuated by a lever 40 to open the valve opening.
[0003]
A flow path adjustment rod 41 having a spiral blade is attached to the tip of the adjustment joint 34, and the flow path adjustment rod 41 is inserted into the nozzle tip 36 to be connected to the inner peripheral surface of the nozzle tip 36. Thus, a spiral flow path is formed. A through hole 42 is also provided at the tip of the adjustment joint 34. When the valve port is opened in the state of FIG. 4, the high-pressure water enters the spiral flow path through the through hole 42 and turns into a spiral flow in the spiral flow path, and spreads from the tip of the nozzle tip 36. Injected in the pattern.
[0004]
As shown in FIG. 5, when the adjustment nut 35 screwed into the adjustment joint 34 is turned, the nozzle tip 36 is pushed forward together with the adjustment nut 35, and the flow path adjustment rod 41 is moved from the nozzle tip 36. Retreat relatively. Accordingly, in this case, a spiral flow path is not formed in the nozzle tip 36, and the high-pressure water that has passed through the through hole 42 goes straight as it is and is jetted from the nozzle tip 36 in a pattern in which the tip is narrowed at a high speed. The
[0005]
[Problems to be solved by the invention]
Since the conventional injection nozzle described above is a method of rotating the screwed member and moving the nozzle tip back and forth when changing the injection pattern, it is necessary to rotate the screwing member many times. There is a problem that change takes time. In addition, when ejecting a high-pressure fluid, there is a problem that the screwing member loaded with a high pressure does not rotate by hand force, and the ejection pattern cannot be adjusted appropriately. Furthermore, since the nozzle tip moves back and forth, there is a problem that the length dimension of the injection nozzle cannot be made compact.
[0006]
Accordingly, an object of the present invention is to provide an injection nozzle in which the injection pattern can be easily changed and the length dimension can be reduced.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, an injection nozzle according to the present invention is formed so as to be rotatable relative to a pipe joint connected to a fluid flow path and a base end fitted into the outer peripheral surface of the pipe joint. The adjustment joint, a nozzle tip fixed to the tip of the adjustment joint with a cap nut, and a one-end-closed cylindrical flow path forming member fixed to the inside of the adjustment joint. The tip of the flow path forming member provided with a groove is fitted into the inner peripheral surface of the nozzle tip, and the closed base end of the flow path forming member is fitted into the inner peripheral surface of the pipe joint tip. A fluid introduction hole is provided in the peripheral wall of the base end of the flow path forming member fitted to the inner peripheral surface of the joint distal end, and the fluid is formed at a circumferential position on the outer peripheral surface of the flow path forming member different from the position where the fluid introduction hole is provided. A groove extending to the tip side starting from the axial position of the introduction hole is provided. A space in which both ends in the axial direction are closed is provided between the outer peripheral surface of the pipe joint tip and the inner peripheral surface of the adjustment joint, and a first through-hole communicating with the space is formed in the peripheral wall of the pipe joint tip. And the second through hole, the first through hole is formed with the fluid introduction hole of the flow path forming member and the starting point of the groove aligned with each other, and the second through hole is formed with the flow path. The structure formed outside the closed end of the member was adopted.
[0008]
That is, the flow path forming member fixed to the adjustment joint is rotatable relative to the pipe joint, and the fluid flowing from the second through hole of the pipe joint into the first through hole through the space is formed as a flow path. By selectively switching between a flow path that passes from the fluid introduction hole to the inside of the flow path forming member and a flow path that passes from the groove on the outer peripheral surface of the flow path forming member to the flow path that passes through the spiral groove by relative rotation of the member, The fluid inside was changed to straight flow and swirl flow, so that the injection pattern could be changed easily.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIGS. 1 and 2, the injection nozzle includes a pipe joint 1 connected to a fluid flow path, an adjustment joint 2 having a proximal end fitted on the outer peripheral surface of the pipe joint 1, and the adjustment Basically, the nozzle tip 3 attached to the tip of the joint 2 for use and the end-cylinder-shaped flow path forming member 6 attached to the step portion 4 provided on the inner peripheral surface of the adjustment joint 2 with the screw 5 It is configured.
[0010]
The adjusting joint 2 is fixed in the axial direction so as to be rotatable relative to the pipe joint 1 by a ball 7, and the space between the adjusting joint 2 and the pipe joint 1 is sealed by an O-ring 8. A stopper screw 9 is attached near the base end of the adjustment joint 2 and engages with a circumferential groove 10 provided on the outer peripheral surface of the pipe joint 1 to position the rotation angle of the adjustment joint 2. It is like that. Further, a screw thread 11 is provided on the outer peripheral surface at the distal end portion of the adjustment joint 2, and the nozzle tip 3 is attached to the distal end portion with a cap nut 13 via an O-ring 12.
[0011]
The pipe joint 1 is formed with a tip having a small diameter, and the tip is fitted into a stepped portion 14 provided on the inner peripheral surface of the adjustment joint 2. 15 is provided. A first through hole 16 and a second through hole 17 communicating with the space 15 are provided on the peripheral wall at the tip of the pipe joint 1. Two first through-holes 16 are provided with their positions in the axial direction aligned with the starting points of a fluid introduction hole 18 and a groove 19 of the flow path forming member 6 described later, and shifted in phase by 180 °. The second through holes 17 are formed at axial positions outside the closed base end of the flow path forming member 6 and are provided with six phases shifted by 60 °.
[0012]
The flow path forming member 6 has a closed proximal end fitted into the inner peripheral surface of the distal end portion of the pipe joint 1 and an opened distal end side fitted into the inner peripheral surface of the nozzle tip 3. As shown in FIGS. 3A and 3B, the flow path forming member 6 has a flange 20, and a stepped portion of the adjustment joint 2 is passed through a screw 21 through a hole 21 provided in the flange 20. 4 can be attached.
[0013]
A spiral groove 22 is provided on the outer peripheral surface on the tip side of the flange 20. The peripheral wall near the base end of the flow path forming member 6 is provided with two fluid introduction holes 18 that are 180 ° out of phase with each other. A groove 19 extending from the axial position of the introduction hole 18 to the distal end side is provided. The groove 19 passes through the flange 20 and communicates with the outer periphery on the tip side where the spiral groove 22 is provided.
[0014]
Next, a method for changing the injection pattern of the injection nozzle will be described. The adjustment joint 2 is turned by hand, and as shown in FIGS. 1A and 1B, the position of the fluid introduction hole 18 of the flow path forming member 6 is changed to the first through hole 16 of the pipe joint 1. , The high-pressure water supplied to the pipe joint 1 flows out from the second through-hole 17 into the space 15 as shown by the arrows in the drawing, and the first through-hole 16 and the fluid whose positions are matched. It enters the flow path forming member 6 through the introduction hole 18 and is jetted from the tip of the nozzle tip 3 as a linear flow. Therefore, the injection pattern at this time is a tip that is squeezed at high speed.
[0015]
The adjustment joint 2 is turned by 90 ° from the state shown in FIG. 1, and as shown in FIGS. 2A and 2B, the position of the groove 19 of the flow path forming member 6 is changed to the pipe joint 1. The high-pressure water flowing out from the second through-hole 17 to the space 15 is aligned with the first through-hole 16 as shown by arrows in the drawing. Through the groove 19, enters the spiral channel formed by the spiral groove 22 and the inner peripheral surface of the nozzle tip 3, and is jetted from the nozzle tip 3 as a swirling flow. Accordingly, at this time, the spray pattern is widened.
[0016]
Further, if the turning angle of the adjustment joint 2 is set to 45 °, the high-pressure water flowing from the first through hole 16 is distributed to both the fluid introduction hole 18 and the groove 19 to obtain an intermediate injection pattern. be able to. If the hand turning angle is larger than 45 °, the degree of forward spreading of the spray pattern increases, and if it is decreased, the spray pattern changes in the direction in which the tip is narrowed.
[0017]
In the embodiment described above, the flow path forming member has a cylindrical shape, but may have a tapered tip shape or the like according to the shape of the inner peripheral surface of the nozzle tip. Further, the number of the fluid introduction holes and the grooves on the outer peripheral surface can be changed.
[0018]
【The invention's effect】
As described above, the injection nozzle according to the present invention enables the one-end-closed cylindrical flow path forming member fixed inside the adjustment joint to be rotatable relative to the pipe joint, and the closed base end portion of the flow path forming member Is inserted into the distal end portion of the pipe joint, and the base end portion is provided with a fluid introduction hole and a groove extending toward the distal end side along the outer peripheral surface, and a spiral groove is provided on the outer peripheral surface of the distal end portion of the flow path forming member. The fluid supplied from the pipe joint to the flow path that passes from the fluid introduction hole to the inside of the flow path forming member and the flow path that passes from the groove on the outer peripheral surface of the flow path forming member to the spiral groove. Since the switching is selectively performed, the injection pattern can be easily changed by rotating the adjusting joint. In addition, since this injection nozzle does not use screws for changing the injection pattern, even when high-pressure fluid is injected, the adjustment joint can be rotated manually and the nozzle tip does not move back and forth. The dimensions can be made compact.
[Brief description of the drawings]
1 is a longitudinal sectional view showing an embodiment of an injection nozzle, b is a sectional view taken along line Ib-Ib of FIG. 2a is a state in which the adjustment joint of FIG. FIG. 3 is a sectional view taken along line IIb-IIb of FIG. 3. FIG. 3a is an external perspective view of the flow path forming member of FIG. 1, and b is a sectional perspective view of FIG. FIG. 5 is a partially omitted longitudinal sectional view showing a state where the gun nozzle of FIG. 4 is operated.
DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Adjustment joint 3 Nozzle tip 4 Step part 5 Screw 6 Flow path formation member 7 Ball 8 O ring 9 Screw 10 Groove 11 Thread 12 O ring 13 Cap nut 14 Step part 15 Space 16, 17 Through-hole 18 Fluid Introduction hole 19 Groove 20 Flange 21 Hole 22 Spiral groove 31 Flow path 32 Grip 33 Valve seat 34 Adjustment joint 35 Adjustment nut 36 Nozzle tip 37 Cap nut 38 Coil spring 39 Valve body 40 Lever 41 Channel adjustment rod 42 Through hole

Claims (1)

A pipe joint connected to the fluid flow path, an adjustment joint that is fitted to the outer peripheral surface of the pipe joint so as to be rotatable relative to the pipe joint, and a cap nut at the tip of the adjustment joint The nozzle tip is composed of a fixed nozzle tip and an end-closed cylindrical channel forming member fixed inside the adjustment joint, and the tip of the channel forming member having a spiral groove on the outer peripheral surface is the nozzle. A flow path that is fitted into the inner peripheral surface of the tip of the pipe fitting and fitted into the inner peripheral surface of the tip of the pipe joint. A fluid introduction hole is provided in the peripheral wall of the base end of the forming member, and the tip side is located at the circumferential position on the outer peripheral surface of the flow path forming member that is different from the position where the fluid introduction hole is provided, starting from the axial position of the fluid introduction hole. A groove extending to the outer periphery of the pipe joint tip and the adjustment surface. A space in which both ends in the axial direction are closed is provided between the inner peripheral surface of the joint for use, and a first through hole and a second through hole communicating with the space are provided in the peripheral wall of the pipe joint tip. The first through hole is formed with the fluid introduction hole of the flow path forming member and the starting point of the groove being aligned with each other in the axial direction, and the second through hole is outside the closed end of the flow path forming member. The injection nozzle formed on.

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