JP6295482B2 - Liquid injection nozzle - Google Patents

Description

  The present invention relates to a liquid ejecting nozzle in which liquid supplied to a supply port flows through a plurality of introduction paths and is ejected from ejection holes provided for each of the introduction paths.

Conventionally, as a liquid jet nozzle in which liquid supplied to a supply port flows through a plurality of introduction paths and is ejected from an injection hole provided for each introduction path, for example, one disclosed in Patent Document 1 below is known. Yes.
Patent Document 1 relates to a papermaking ear-cut nozzle. In this papermaking edge cutting nozzle, a plurality of introduction paths having a substantially constant cross-sectional shape are provided over the entire length, a supply port is provided on one end side of each introduction path, and an injection hole is provided on the other end side. When the high-pressure liquid is supplied to each supply port, the flow is rectified in each introduction path and is jetted as a transparent rod flow from each jet hole.

  The transparent rod flow is a state in which the jetted liquid moves in the air without spreading and does not spread, and changes to a cloudy flow while moving in the air. This transparent bar flow is maintained at a longer distance as the liquid flow velocity and direction at each position in the cross-sectional direction of the transparent bar flow are more uniform. For this reason, the distance of the transparent rod flow can be increased by rectifying the high-pressure liquid in the introduction path before injection or in the injection hole or by equalizing the flow velocity.

Design Registration No.813431

  However, in the conventional liquid jet nozzle, in order to sufficiently rectify the supplied high-pressure liquid and lengthen the transparent rod flow, a long introduction path is required, and the total length of the liquid jet nozzle has to be lengthened. However, if the introduction path is lengthened, the pressure loss in the flow path increases, so the injection pressure of the transparent rod flow to be injected decreases.

  Accordingly, an object of the present invention is to provide a liquid jet nozzle that can stably jet a stronger transparent rod flow from a plurality of jet holes and can shorten the overall length.

In the liquid injection nozzle of the present invention that achieves the above object, a high-pressure liquid of 30 kg / cm ² or more supplied to the supply port flows through a plurality of introduction paths, and a transparent bar flow is generated from the injection holes provided for each introduction path. A high-pressure liquid jet nozzle that jets at a pressure that is 0.5 to 1.0 times the supply pressure, wherein an introduction space is provided between the supply port and the plurality of introduction paths, and the introduction space is connected to the supply port. have a cross sectional area greater than the sum of the cross-sectional area of the large plurality of introduction paths than the area, further, an opening and closing valve for opening and closing the supply opening, and the cleaning liquid inlet portion and the cleaning liquid recovery section provided on the downstream side of the on-off valve, the The cleaning liquid can be introduced from the cleaning liquid introduction section while the on-off valve is closed, and can be discharged from the cleaning liquid discharge section .

  According to the liquid jet nozzle of the present invention, since the introduction space is provided between the supply port and the plurality of introduction paths, the liquid supplied to the supply port is once introduced into the introduction space and then distributed to the plurality of introduction paths. Is done. Since the cross-sectional area of the introduction space is larger than the cross-sectional area of the supply port and equal to or greater than the sum of the cross-sectional areas of the plurality of introduction paths, the total cross-sectional area of the liquid flow path is enlarged when liquid is introduced from the supply port into the introduction space. When the liquid is introduced from the introduction space into the plurality of introduction paths, the entire cross-sectional area of the flow path is reduced.

  Therefore, compared with the case of distributing directly to a plurality of introduction paths from the supply port, the flow can be efficiently rectified by expanding the flow path once in the introduction space and then distributing to the plurality of introduction paths, thereby shortening the introduction path. can do. As a result, it is possible to provide a liquid jet nozzle capable of stably jetting a stronger transparent rod flow from the plurality of jet holes and shortening the overall length of the nozzle.

The liquid injection nozzle which concerns on 1st Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is a cross-sectional view. It is the side view which showed a part of liquid injection nozzle which concerns on 2nd Embodiment of this invention with sectional drawing, and has shown the state which widened the introduction space. It is the side view which showed a part of liquid injection nozzle which concerns on 2nd Embodiment of this invention with sectional drawing, and has shown the state which narrowed the introduction space. It is a perspective view which shows the position adjustment method of the injection hole of the liquid injection nozzle which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the liquid injection nozzle which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the example which wash | cleans the liquid injection nozzle which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the liquid injection nozzle which shows the modification provided with many introduction paths and injection holes of the liquid injection nozzle of this invention. It is a side view of the liquid injection nozzle which shows the modification of the structure which wash | cleans the liquid injection nozzle of this invention from the inside.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
In this embodiment, an explanation will be given by using an example of a liquid jet nozzle that is used as a papermaking edge cutting nozzle.
As shown in FIGS. 1A and 1B, the liquid jet nozzle 10 is provided on one end side in the axial direction and supplied with a high pressure liquid, and provided on the other end side to supply the high pressure liquid. An injection unit 13 that injects, and a rectification unit 15 that is provided between the supply unit 11 and the injection unit 13 and rectifies the high-pressure liquid. In this embodiment, the supply unit 11 and the rectification unit 15 are provided integrally with the nozzle body 17, and the injection unit 13 includes a cap 19 attached to the nozzle body 17 and a chip 21 supported by the cap 19. Is formed.

  The supply unit 11 includes a screw portion to which a primary side pipe (not shown) is connected, and one supply port 23 to which high-pressure liquid is supplied from the primary side. The supply port 23 is provided in the axial direction and has a circular cross-sectional shape centered on the axis.

The rectification unit 15 includes one introduction space 25 into which high-pressure liquid is introduced from the supply port 23 and a plurality of introduction paths 27 that communicate with the introduction space 25 and extend to the injection unit 13. It is arranged between the supply port 23 and the plurality of introduction paths 27. Each introduction space 25 has a circular cross-sectional shape centered on the axis, and has a predetermined length in the axial direction. Each introduction path 27 is provided in parallel with the axis, the cross-sectional shape orthogonal to the axis is circular, and has a predetermined length in the axial direction.
At the tip of the nozzle body 17, a joining protrusion 29 is formed that protrudes in the axial direction in a state where the introduction path 27 is opened.

  The injection unit 13 includes a cap 19 that is fitted and attached to the joint protrusion 29 of the nozzle body 17, and a chip 21 that is disposed at the tip of the nozzle body 17 and supported by the cap 19. The tip 21 is provided with an injection hole 31 corresponding to the introduction path 27. Each injection hole 31 is provided in parallel with the axis, the cross-sectional shape orthogonal to the axis is circular, and the substantially entire length of the tip 21 is a constant cross-sectional shape. The diameter of the ejection hole 31 is appropriately set according to the application of the liquid ejection nozzle 10.

  Inside the cap 19, a positioning portion for arranging the chip 21 at a predetermined position is provided. When the chip 21 is placed on the cap 19 and the cap 19 is attached to the nozzle body 17, the cap 19 is positioned by being fitted to the joint protrusion 29. Therefore, the tip 21 is positioned with respect to the introduction path 27, and each injection hole 31 is disposed at a predetermined position with respect to the introduction path 27. In this embodiment, each injection hole 31 is opened at a central portion, preferably at the center, in the cross section of the introduction path 27.

  In the liquid injection nozzle 10, a plurality of introduction paths 27 are provided separately, and the injection holes 31 are opened for each of the introduction paths 27. This is to prevent interference that may affect the pressure and flow of the liquid supplied to 31. That is, when the liquid ejected from each ejection hole 31 affects the liquid supplied to the surrounding ejection holes 31, not only the pressure of the liquid ejected from each ejection hole 31 varies, but also the fluid that flows. Or the flow state of the liquid to be ejected is lost. Then, the transparent state of the bar flow injected from each injection hole 31 is shortened, and a stable and strong transparent bar flow cannot be obtained. However, if the injection holes 31 are provided for each of the introduction passages 27, a strong transparent rod flow can be evenly injected from each of the plurality of injection holes 31.

  In such a liquid jet nozzle 10, in order to efficiently rectify the high-pressure liquid by the rectifying unit 15, the size and length of each part are appropriately set. Here, rectification is to reduce the disturbance of the liquid flow. For example, the microscopic liquid flow direction at each position orthogonal to the axis of the flow path is aligned with the direction along the axis, and in a remarkable case, the turbulent flow is made laminar. is there.

Specifically, first, the cross-sectional area of the introduction space 25 is larger than the cross-sectional area of the supply port 23 and is equal to or larger than the sum of the cross-sectional areas of the plurality of introduction paths 27. In the present invention, the cross-sectional area is a cross-sectional area of a plane orthogonal to the axis. In this embodiment, according to Gibson's experimental results, the cross-sectional area of the introduction space 25 is, for example, greater than 1 time and less than 4 times, preferably greater than 1 time and less than or equal to 2.25 times the cross-sectional area of the supply port 23. .
If the cross-sectional area of the introduction space 25 is smaller than the cross-sectional area of the supply port 23, a sufficient rectifying effect cannot be obtained unless the introduction path 27 is excessively long. On the other hand, when the cross-sectional area of the introduction space 25 is excessively larger than the cross-sectional area of the supply port 23, the pressure loss increases and the turbulence tends to increase.

導入空間２５の軸方向長さが過剰に短いと、十分な整流効果が得られないことがあり、一方、過剰に長いと液体噴射ノズル１０の全長が長くなる。 The length of the introduction space 25 in the axial direction is preferably set to be 1/2 or more of the length of the supply port 23 in the axial direction. The ratio between the axial length of the introduction space 25 and the axial length of the supply port 23 has a correlation with the ratio between the cross-sectional area of the introduction space 25 and the cross-sectional area of the supply port 23. The larger the cross-sectional area difference, the longer the introduction space 25 may be provided.
Considering the following Table 1 in which the range was confirmed by adjusting the length and cross-sectional area of each part, for example, the ratio of (the axial length of the introduction space 25) / (the axial length of the supply port 23) is (introduction) The ratio of the cross-sectional area of the space 25) / (the cross-sectional area of the supply port 23) may be 1 to 3 times, preferably 1 to 2 times.

If the axial length of the introduction space 25 is excessively short, a sufficient rectifying effect may not be obtained. On the other hand, if it is excessively long, the total length of the liquid jet nozzle 10 becomes long.

導入空間２５の断面積が導入路２７の断面積の総和より小さいと、導入空間２５から複数の導入路２７に液体が導入されたとき、断面積が増加するため、導入路２７における十分な整流効果を得るのに長い導入路２７が必要となる。一方、導入空間２５の断面積が導入路２７の断面積の総和に比べて過剰に大きいと、流体の運動量保存の法則に基づき、圧力損失が大幅に増加したり、ベルヌーイの定理に基づき、流速が大幅に増加したりすることがある。 In addition, the cross-sectional area of the introduction space 25 is adjusted by adjusting the length and cross-sectional area of each part, and the range is confirmed. 1 to 8 times the total.

If the cross-sectional area of the introduction space 25 is smaller than the sum of the cross-sectional areas of the introduction path 27, the cross-sectional area increases when liquid is introduced from the introduction space 25 into the plurality of introduction paths 27. A long introduction path 27 is required to obtain the effect. On the other hand, if the cross-sectional area of the introduction space 25 is excessively larger than the sum of the cross-sectional areas of the introduction path 27, the pressure loss is greatly increased based on the law of conservation of momentum of the fluid, or the flow velocity is determined based on Bernoulli's theorem. May increase significantly.

The axial length of the introduction path 27 may be equal to or less than the axial length of the entire supply port 23 and the introduction space 25, but in this embodiment, the following table confirms the range by adjusting the size and number of each part. 3 is set to be not less than 2 times and not more than 8 times the diameter of the introduction path 27. If the length of each introduction path 27 in the axial direction is excessively long, the total length of the liquid jet nozzle becomes long and it is difficult to reduce the size, and pressure loss increases in proportion to the length.

Considering the following Table 4 in which the diameter of each introduction passage 27 is adjusted by adjusting the size of each part, for example, the diameter of each injection hole 31 is 2 to 100 times, preferably 2 to 50 times. And When the diameter of the introduction path 27 is excessively large with respect to the diameter of the injection hole 31, the arrangement interval of the injection holes 31 is widened, and when it is excessively small, the adjacent injection holes 31 interfere with each other. Occurs.

In order to eject a transparent stick flow using such a liquid ejection nozzle 10, first, a high-pressure liquid is supplied to the supply port 23 from a primary side (not shown). The liquid supplied to the supply port 23 is water, an aqueous solution, a water suspension, or the like supplied under pressure, and may be, for example, a high-pressure liquid of 30 kg / cm ² or more. In this embodiment, 35 kg / A high pressure liquid of cm ^{2 to} 40 kg / cm ² is supplied. The supply flow rate is an amount ejected from the plurality of ejection holes 31 and may be, for example, 0.5 L (liter) / min or more. In this embodiment, 0.8 L / min to 0.9 L / min (when the diameter of the injection hole is 0.4) is supplied.

When the high-pressure liquid is supplied to the supply port 23 and introduced into the introduction space 25, the cross-sectional area of the flow path orthogonal to the flow is enlarged. At this time, when the flow path is enlarged, the turbulence of the flow increases and a pressure loss occurs.
Subsequently, the introduction space 25 is distributed to a plurality of introduction paths 27. At this time, by reducing the cross-sectional area of the flow path, the turbulence of the flow increases and a pressure loss occurs. However, compared with the case where the supply port 23 directly supplies the plurality of introduction paths 27, the increase in the flow turbulence can be reduced.
Thereafter, the flow is rectified by flowing through the plurality of introduction paths 27, and reaches the tip of each introduction path 27. A wall surface orthogonal to the axis is formed by the tip 21 at the tip of each introduction path 27, and the injection hole 31 is provided on the wall surface, so that the high-pressure liquid is equally injected from the injection hole 31.
As a result, a transparent rod flow is formed on the outside from the injection hole 31.

  The pressure of the liquid ejected from the ejection hole 31 is desirably the pressure supplied to the supply port 23 as much as possible, and may be, for example, 0.5 times or more the supply pressure. In this embodiment, it is 0.5 to 1.0 times the supply pressure.

  According to the liquid jet nozzle 10 as described above, since the introduction space 25 is provided between the supply port 23 and the plurality of introduction paths 27, the liquid supplied to the supply port 23 is once introduced into the introduction space 25. To the plurality of introduction paths 27. Since the cross-sectional area of the introduction space 25 is larger than the cross-sectional area of the supply port 23 and is equal to or greater than the sum of the cross-sectional areas of the plurality of introduction paths 27, the flow path is used when liquid is introduced from the supply port 23 into the introduction space 25. When the liquid is introduced from the introduction space 25 into the plurality of introduction paths 27, the cross-sectional area of the flow path is not enlarged.

  When the liquid is introduced from the supply port 23 into the introduction space 25 and when introduced from the introduction space 25 into the plurality of introduction passages 27, pressure loss occurs and flow disturbance increases. However, compared with the case of distributing directly from the supply port 23 to the plurality of introduction paths 27, the flow is more efficiently rectified when the flow path is temporarily expanded in the introduction space 25 and then distributed to the plurality of introduction paths 27. it can. Therefore, in the entire liquid ejecting nozzle 10, the flow path can be shortened and the entire length of the liquid ejecting nozzle 10 can be shortened. Moreover, since the introduction path 27 can be shortened, the pressure loss in the introduction path 27 can be suppressed, and a strong transparent rod flow can be stably ejected. As a result, it is possible to shorten the overall length of the liquid jet nozzle 10 and to form a stronger and more stable transparent rod flow at a longer distance. Such an effect becomes more prominent as the cross-sectional area of the supply port 23 is smaller than the sum of the cross-sectional areas of the introduction space 25.

  In this liquid injection nozzle 10, each injection hole 31 is opened at the center in the cross section orthogonal to the axis of the introduction path 27, so that liquid at a position spaced from the inner wall surface of the introduction path 27 is injected from the injection hole 31. It is possible to reduce the influence of the flow near the boundary of the inner wall surface. Therefore, the flow of the liquid ejected from each ejection hole 31 is well balanced, and a transparent rod stream can be formed at a longer distance.

[Second Embodiment]
2 to 4 show the liquid jet nozzle 10 of the second embodiment.
In the liquid jet nozzle 10, as shown in FIGS. 2 and 3, the nozzle body 17 is formed in a divided structure, and the rectifying unit 15 having the introduction space 25 and the plurality of introduction paths 27, and the supply port 23 pass therethrough. The supply unit 11 provided in a separate manner is provided separately and connected.

  An insertion protrusion 33 that is inserted into the introduction space 25 of the rectifying unit 15 so as to be able to advance and retreat is provided on the distal end side of the supply unit 11. 35 and a seal member 37 that hermetically closes between the inner periphery of the rectifying unit 15 is provided. Further, on the end portion side of the supply port 23 on the distal end side, an expanding portion 39 having a cross-sectional area gradually increasing toward the introduction space 25 of the rectifying portion 15 is provided. A support male screw 41 is provided on the outer periphery on the rear end side of the supply unit 11 and is screwed into a support unit 43 disposed on the primary side. On the rear end side of the rectifying unit 15, a connecting female screw 45 that is screwed with the connecting male screw 35 of the supply unit 11 is provided. Others are the same as in the first embodiment.

In such a liquid jet nozzle 10, as shown in FIG. 2, the supply unit 11 and the rectification unit 15 are relatively rotated, and the insertion protrusion 33 of the supply unit 11 is retracted in the introduction space 25 of the rectification unit 15. Thereby, the axial direction length of the introduction space 25 can be lengthened, and the effect | action of rectification | straightening can be strengthened.
On the other hand, as shown in FIG. 3, by inserting the insertion protrusion 33 of the supply unit 11 into the introduction space 25 of the rectification unit 15, the axial length of the introduction space 25 can be shortened. In addition to the expanded portion 39, the introduction space 25 can be eliminated. Thereby, the pressure loss at the time of flowing the introduction space 25 can be reduced, and a high-pressure fluid can be supplied through the plurality of introduction passages 27 and the injection holes 31.

  As shown in FIG. 4, when the supply unit 11 and the rectifying unit 15 are relatively rotated, the injection hole 31 of the injection unit 13 can be rotated around the axis. Thereby, the position with respect to the axis | shaft of a some transparent rod flow can be adjusted to the circumferential direction. Furthermore, the position of the injection hole 31 in the axial direction of the injection unit 13 can be adjusted by relatively rotating the supply unit 11 and the rectifying unit 15 or relatively rotating the supply unit 11 and the support unit 43. .

According to such a liquid jet nozzle of the second embodiment, the same effect as that of the first embodiment can be obtained. Further, the rectifying unit 15 provided with the introduction space 25 and the plurality of introduction paths 27 and the supply unit 11 provided with the supply port 23 and connected to the rectification unit 15 are provided. Since the insertion protrusion 33 inserted so as to be able to advance and retract is provided, the length of the introduction space 25 in the axial direction can be expanded and contracted by advancing and retracting the insertion protrusion 33 of the supply unit 11.
For this reason, when the liquid jet nozzle 10 is used, a transparent rod flow can be easily formed by providing a long introduction space 25, and at the time of cleaning, the introduction space 25 is shortened and stronger turbulent flow is caused in the introduction path 27 and the injection hole 31. The liquid in the state can be supplied, for example, to be cleaned efficiently.
Note that the cleaning effect may be improved by increasing the inclination of the expanding portion 39 with respect to the axial direction, for example, by making the angle between the inner wall surfaces at the opposing positions obtuse.

[Third Embodiment]
5 and 6 show the liquid jet nozzle 10 of the third embodiment.
As shown in FIG. 5, the liquid jet nozzle 10 includes an on-off valve 47 that opens and closes the supply port 23, and a cleaning liquid introduction unit 51 and a cleaning liquid that are provided in the supply unit 11 of the nozzle body 17 on the downstream side of the on-off valve 47. And a discharge unit 53.

  In this embodiment, while the cleaning nozzle 55 is used to form a transparent bar flow, the cleaning liquid introduction unit 51 and the cleaning liquid discharge unit 53 are not mounted, and are provided in the supply unit 11 for mounting them. A closing member is attached to the opening. When the cleaning nozzle 55 is cleaned, the closing member of the opening is removed, and the cleaning liquid introduction part 51 and the cleaning liquid discharge part 53 are mounted as shown in FIG.

  The cleaning liquid introduction section 51 includes a cleaning nozzle 55 that protrudes from the supply port 23 and a mounting section 57 that is airtightly mounted in the opening. The high-pressure cleaning liquid is supplied from a high-pressure cleaning liquid supply source (not shown). 59 can be supplied. The cleaning liquid discharger 53 has a drainage pipe 61 connected to the opening so as to communicate with the supply port 23. Other configurations are the same as those of the first embodiment.

Such a liquid jet nozzle 10 can be used in the same manner as in the first embodiment when forming a transparent bar flow.
Due to this use, foreign matter may adhere to the inside of the liquid ejection nozzle 10, for example, the introduction space 25, the introduction path 27, and the ejection hole 31. In the case of a papermaking nozzle, not only the reusable water and the paper bowl contained in the liquid that rebounds during cutting adheres to the outside of the liquid jet nozzle 10 but also enters and stays inside. The paper cake that has entered the inside accumulates as a viscous substance, or adheres to the inner surface when further dried. Since these obstruct the formation of the transparent bar flow, it is necessary to clean the liquid jet nozzle 10.

In order to clean the liquid jet nozzle 10 of the third embodiment, as shown in FIG. 6, after the cleaning liquid introduction part 51 and the cleaning liquid discharge part 53 are mounted on the supply part 11 of the nozzle body 17, the on-off valve 47 is closed. In this state, a high-pressure cleaning liquid is introduced into the cleaning liquid introducing section 51. Then, a high-pressure cleaning liquid is introduced from the cleaning nozzle 55 into the plurality of introduction paths 27 in a turbulent state, a part of the cleaning liquid is discharged to the outside from each injection hole 31, and the remaining part is discharged from the cleaning liquid discharge part 53. This cleans the inside.
Also, with the on-off valve 47 closed, the spray gun 63 is inserted into the injection hole 31, high-pressure cleaning liquid is introduced from the injection hole 31 and discharged from the cleaning liquid discharge part 53, thereby cleaning the inside.

  According to such a liquid jet nozzle of the third embodiment, the same operation effect as that of the first embodiment can be obtained, and the on-off valve 47 that opens and closes the supply port 23 and the downstream side of the on-off valve 47 are provided. The cleaning liquid introduction unit 51 and the cleaning liquid discharge unit 53 are provided, and the cleaning liquid can be introduced from the cleaning liquid introduction unit 51 and can be discharged from the cleaning liquid discharge unit 53 with the on-off valve 47 closed. The inside can be easily cleaned.

[Modification]
The embodiment can be appropriately changed within the scope of the present invention.
For example, in the first to third embodiments, the example of the liquid injection nozzle 10 having the introduction path 27 and the two injection holes 31 has been described. However, the numbers of the introduction path 27 and the injection holes 31 are not particularly limited. As shown in FIG. 7, a large number of introduction paths 27 and injection holes 31 can be provided.
Moreover, although each said embodiment demonstrated the example in which the several introduction path 27 and the several injection hole 31 were arranged in a line in the diameter direction, arrangement | positioning of the several introduction path 27 and the several injection hole 31 is also specifically limited. However, it is also possible to arrange two-dimensionally in a cross-sectional direction orthogonal to the flow.
Furthermore, in the said 3rd Embodiment, the example which provided the on-off valve 47, the washing | cleaning-liquid introduction part 51, and the washing | cleaning-liquid discharge part 53 in the liquid injection nozzle 10 of 1st Embodiment in which the nozzle main body 17 and the supply part 11 were integrally formed. However, as shown in FIG. 8, for example, the nozzle body 17 and the supply unit 11 may be provided in the liquid ejection nozzle 10 of the second embodiment in which the nozzle body 17 and the supply unit 11 are formed separately.

[Example 1]
Using the liquid jet nozzle 10 shown in FIG. 1, high-pressure water was supplied to the supply port 23 and jetted from the two jet holes 31 to form two transparent rod streams. The supply port 23 has a diameter of 8 mm and a length of 6 mm, the introduction space 25 has a diameter of 13 mm and a length of 18 mm, the introduction path 27 has a diameter of 6.4 mm and a length of 40 mm, and the injection hole 31 has a diameter of 0.4 mm. It was.
The liquid jet nozzle 10 was disposed horizontally, and high-pressure water was supplied to the supply port 23 at a pressure of 30 kg / cm ² (3 MPa) and a flow rate of 0.76 L / min.

Here, the cross-sectional area of the introduction space 25 is 2.7 times the cross-sectional area of the supply port 23 and 1.98 times the total cross-sectional area of the introduction path 27.
The ratio of (axial length of introduction space 25) / (axial length of supply port 23) is 1.13 times the ratio of (cross sectional area of introduction space 25) / (cross sectional area of supply port 23). It has become.
The axial length of the introduction path 27 is 6.25 times the diameter of the introduction path 27, and the diameter of each introduction path 27 is 16 times the diameter of each injection hole 31.

  As a result, the two rod streams injected from the injection hole 31 were transparent in the vicinity of the injection hole 31 and became cloudy at a position away from the injection hole 31. When the distance from the injection hole 31 was measured for the shortest position where the cloudiness of the two of the two that became cloudy earlier was measured, it was about 90 mm. Further, the pressure of the injected liquid was substantially equal to the supply pressure.

[Comparative Example 1]
A comparative nozzle similar to that of Example 1 was produced except that a plurality of introduction paths were provided over the entire length without providing the introduction space 25 and the supply port 23. In this comparative example nozzle, the plurality of introduction paths have a length corresponding to the total length of the supply port 23, the introduction space 25, and the introduction path 27 in the liquid jet nozzle 10 of the first embodiment. Using this comparative example nozzle, high-pressure water was supplied under the same conditions as in the example and sprayed from the two injection holes 31 to form a bar flow.
As a result, the distance from the injection hole 31 to the shortest position where white turbidity occurred was about 90% of the example. Moreover, the pressure of the injected liquid was about 100% of the Example.
In addition, when the total length of the comparative example nozzle was lengthened and the plurality of introduction paths were further lengthened, the distance until white turbidity was not increased as in Example 1, and the pressure of the spray liquid was reduced. On the other hand, when the total length of the comparative example nozzle was shortened and the plurality of introduction paths were shortened, the injection pressure could be increased as in Example 1, but the distance until cloudiness occurred was shortened.

[Examples 2 to 11]
As shown in Table 1, the liquid injection nozzle 10 was created by changing the size of each part from that of Example 1, and the distance until the transparent bar flow became cloudy (the length of the transparent bar flow) was injected. The liquid pressure (injection pressure) and the flow rate of the nozzle were measured. The results are shown in Table 5.

  As is clear from the comparison between the example and the comparative example, it was confirmed that by providing the introduction space 25 between the supply port 23 and the introduction path 27, the transparent state of the bar flow can be maintained at a longer distance.

DESCRIPTION OF SYMBOLS 10 Liquid injection nozzle 11 Supply part 13 Injection part 15 Rectification part 17 Nozzle main body 19 Cap 21 Chip 23 Supply port 25 Introduction space 27 Introduction path 29 Joining protrusion 31 Injection hole 33 Insertion protrusion 35 Connection male screw 37 Seal member 39 Expansion part 41 Support male screw 43 Support portion 45 Connecting female screw 47 On-off valve 51 Cleaning liquid introduction section 53 Cleaning liquid discharge section 55 Cleaning nozzle 57 Mounting section 59 Valve 61 Drainage piping

Claims (1)

30kg / cm ² or more high pressure liquid supplied to the supply port, flows through the plurality of introduction passages, 0.5 times the supply pressure of the transparent rod flow from the injection hole provided in the introduction channel every 1.0 A high-pressure liquid jet nozzle that jets at double the pressure,
Introduction space provided between the plurality of introduction path and the supply port,
The introduction space, have a cross sectional area greater than the sum of the cross-sectional area of the larger than the cross-sectional area of the supply port of the plurality of introduction passages,
Furthermore, an on-off valve that opens and closes the supply port, and a cleaning liquid introduction part and a cleaning liquid discharge part provided on the downstream side of the on-off valve,
A liquid ejecting nozzle capable of introducing a cleaning liquid from the cleaning liquid introduction section and discharging the cleaning liquid from the cleaning liquid discharge section in a state where the on-off valve is closed .

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