JP2003080119A - Jetting nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jetting nozzle for jetting a liquid out of a jetting port of the jetting nozzle provided with liquid path 12 with differing cross-section surface area toward a work immersed in a liquid to generate cavitation in the liquid and efficiently remove burr and carry out washing. SOLUTION: The jetting nozzle 10A is composed of a cylindrical member 14 provided with a liquid path 12 having a cylindrical part 18 to pass a liquid L for cavitation generation and a jetting part 20 having a jetting port 16 and the jetting port 16 formed in the tip end wall part of the cylindrical member 14 and sharply throttled like an orifice. In such a jetting nozzle 10A, self- resonance is to be generated in the inside of the jetting part by designing the inner diameter D1 of the cylindrical part 18 and the inner diameter D2 of the jetting part 20 so as to satisfy D1>D2 and therefore, cavitation is generated significantly. Consequently, the efficiency of the cavitation generated in an immersion liquid L2 can be further increased and burr, cutting powder and a machine oil (foreign matter) are efficiently washed out and removed from the work.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a first liquid to a second liquid.
Of the injection nozzle for injecting toward the work immersed in the liquid to wash and remove burrs of the work, more specifically, when cavitation is generated in the second liquid to form the work, The present invention relates to an injection nozzle capable of easily and reliably cleaning and removing burrs formed during processing or molding.

[0002]

2. Description of the Related Art Conventionally, casting, forging, welding, press working,
There is a cavitation generating device as a device for cleaning and removing foreign matter such as burrs remaining on a work manufactured by molding, molding work and the like, chips of burrs still attached to the surface of the work, and working oil. The applicant of the present invention, as a cavitation generation device of this type, is a device that generates cavitation along with spraying a liquid from a spray nozzle into a liquid in which a workpiece is immersed (for example, Japanese Patent Laid-Open No. 6-
JP-A-134414 and JP-A-6-134415) are proposed. Specifically, in the injection nozzle 100 shown in FIG. 13, the ratio between the diameter of the injection port 106 and the distance from the injection port 106 to the work is set within a certain range, or the injection nozzle 110 shown in FIG.
In the above, there is proposed a cavitation generating device that cleans and removes foreign matters such as chips and machine oil by setting the ratio of the diameter of the ejection port 114 of the tip 112 to the diameter of the ejection port 106 within a certain range. . Here, the injection nozzles 100 and 110 have a structure 107 in which the diameter is gradually reduced from the liquid passage 104 to the injection port 106 (hereinafter, the injection nozzles 100 and 110 are referred to as contraction nozzles).

[0003]

By the way, in the above-mentioned conventional cavitation generator, although the erosion force of the cavitation bubbles is weak, it is possible to wash and remove foreign matters and the like adhering to the work. It was not possible to reliably and stably remove burrs formed during the molding, processing, or molding processing.

The present invention has been made in order to solve such a problem, and improves the erosion force of bubbles in cavitation so as to ensure stable cleaning and deburring of foreign matters on a work with only water, for example. It is an object of the present invention to provide an injection nozzle for a cavitation generator that can be performed by the above.

[0005]

In order to solve the above-mentioned problems, an injection nozzle according to the present invention sprays a first liquid into a second liquid from an injection port to thereby inject it into the second liquid. A jet nozzle for generating cavitation, which is provided in a tubular portion provided with a liquid passage for flowing the first liquid to an jet port, and is provided in a tip wall portion of the tubular portion, and is rapidly throttled into an orifice shape. And an injection unit having an injection port that is formed. In addition, the cross-sectional area of the injection unit,
It is formed so as to be smaller than the cross-sectional area of the tubular portion.
With the above-described configuration, the jet flow is sharply narrowed and a contraction flow is generated at the injection port. Since the flow rate of the first liquid is reduced due to the occurrence of the contracted flow, the pump for feeding the liquid to the jet nozzle can be downsized, and the cost required for cleaning and removal can be reduced. Furthermore, since stronger cavitation can be generated, the distance from the jet nozzle to the work can be shortened, and the cavitation generator can be downsized.

Further, since self-resonance is performed in the injection section, the efficiency of cavitation generation can be significantly improved.

Further, it is preferable that a projecting end portion is formed so as to surround the jetting port, and the jetting port is provided with a discharge port communicating with the jetting port. That is, with such a structure, a strong vortex flow is generated between the jet flow and the second liquid even inside the discharge port. As a result, the occurrence of cavitation is promoted, and the work deburring and cleaning effect is further improved.

Further, it is more preferable that the injection nozzle is composed of an injection member having an injection port sharply narrowed like an orifice and a tip member having an ejection port communicating with the injection port. In this case, the tip member is fitted into the tip wall surface of the jet nozzle having the jet port to form the jet nozzle. That is, when it is desired to change the shape of the ejection nozzle according to the type of work, it is only necessary to replace the tip member having a different shape. Therefore, the cost required for the injection nozzle can be reduced.

Further, the injection member is formed so that its cross-sectional area is smaller than that of the tubular member. As a result, self-resonance is caused in the injection portion, so that the efficiency of cavitation generation can be significantly improved.

Further, by chamfering the tip end portion or the tip of the ejection port of the tip end member, further cavitation can be obtained. That is, a strong vortex is generated not only inside the discharge port but also near the tip of the discharge port, so that it is possible to efficiently generate cavitation over a wide range.

Further, when the projection end or the discharge port of the projection end member is formed as a taper portion which is expanded in a tapered shape, a stronger vortex can be generated, and a higher cavitation effect can be obtained.

Further, the injection nozzle as described above is
By using as a spray nozzle for deburring or cleaning a workpiece immersed in the above liquid, it is possible to perform more efficient cleaning and removal of burrs, debris and foreign matter in the workpiece as compared with a conventional contracting nozzle. You can

Further, when a ring member having the same cross-sectional area as that of the injection portion is arranged inside the tip wall surface of the tubular portion, the total length of the injection portion can be easily adjusted by changing the total length of the ring member. Therefore, the amount of cavitation generated can be controlled. Therefore, more effective cavitation can be generated.

Further, by processing the inflow side end portion of the injection port into an arc shape, it is possible to prevent wear and stabilize the jet flow. In addition, the above-mentioned processing has a radius of curvature of 0.01 mm to 0.1 mm.
If it is formed in the range of mm, the flow rate of the jet flow is stabilized, and it is possible to prevent the flow rate change due to wear of the injection port.

In the above injection nozzle, the amount of cavitation generated can be adjusted by changing the total length of the injection portion or the length of the injection portion and the ring member. This is because when the resonance frequency of the jet inside the jet passage matches the natural frequency of the jet nozzle that is determined by the shape of the jet nozzle, resonance of the jet occurs, resulting in a significant increase in cavitation. This is because the phenomenon is realized by changing the total length of the injection unit or the length of the injection unit and the ring member. Therefore, there is a significant amount of cavitation that cannot be obtained with the prior art. Therefore, the work can be easily cleaned and removed. Further, even when the size of the ejection port and the pressure of the first liquid change, optimum cavitation can be obtained by adjusting the total length of the ring member.

By using the degassed liquid as the first liquid jetted from the jet port, a high cavitation effect can be obtained. This is because, for example, when the amount of dissolved gas is large like tap water, the diameter of bubbles generated by cavitation is large, but when cavitation bubbles are destroyed, the large cavitation bubbles cause a cushioning action, and the impact force at the time of destruction is large. Weakens. However, since the liquid previously degassed by the degassing means has a significantly low dissolved gas amount,
The cushion effect is prevented as much as possible. Therefore, the impact force at the time of breaking the cavitation bubbles can be maximized without being weakened, and a high cavitation effect can be obtained. Therefore, it is possible to obtain a good work having almost no foreign matter and burrs.

Furthermore, in addition to the first liquid, the second liquid is also a degassed liquid, so that better foreign matter cleaning / deburring effects can be obtained.

Finally, the first liquid and the second liquid are preferably degassed water. By using water, the working environment can be made safe.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an injection nozzle according to the present invention will be described below with reference to FIGS.

First, the injection nozzle 10 according to the first embodiment.
A is composed of a tubular member 14 provided with a liquid passage 12 as shown in FIG. 1, and an injection port 16 provided in a tip wall portion of the tubular member 14. Further, the tubular member 14 is composed of a tubular portion 18 that circulates the cavitation-generating liquid L1 that is the first liquid, and an ejection portion 20 having an ejection port 16. Then, the first discharged from the injection port 16
The liquid C1 for cavitation generation, which is the liquid, is sprayed into the immersion liquid L2 through the injection port 16 that is opened in the immersion liquid L2 that is the second liquid.

As can be seen from FIG. 1, the diameter of the liquid passage 12 is designed so that D1> D2, where D1 is the inner diameter of the tubular portion 18 and D2 is the inner diameter of the injection portion 20. Further, the injection port 16 is provided so that its diameter is substantially constant. Further, in the tubular member 14, the inner peripheral wall portion and the front end wall portion form an angle of approximately 90 ° with each other, and in the injection unit 20, the inner peripheral wall portion and the front end wall portion also form approximately 90 ° with each other. Has an angle of. In this injection unit 20, the injection port 16 is provided so as to be sharply narrowed like an orifice, and the injection port 16 is provided from the liquid path of the injection unit 20.
However, there is no part that is gradually narrowed, unlike the conventional contraction nozzle. Further, the inflow side end portion 24 of the injection port 16 provided in the tip end wall portion of the injection unit 20 is chamfered (for example, radius 0.01 to 0.1), which prevents abrasion of the injection port 16. It is possible to realize both stabilization of the jet flow 22.

Further, by making the total length L of the injection unit 20 correspond to the resonance frequency N of the jet inside the injection unit 20, a larger amount of cavitation CA can be obtained. That is, the diameter of the injection port 16 is d, the Mach number is M,
When the flow velocity of the jet flow is V, D1 / D2 >> 1 and D2
If / d >> 1, L can be calculated by the following equation.

[0023]     L = K · d / (M · S) (1)     K = (2n-1) / 4 (2)     S = Nd / V (3)

However, n is an integer and 1 or 2 is selected. For example, d = 0.9 mm, D1 = 7 mm, D
When 2 = 3.5 mm is set, when n = 1, L = 6.4.
mm, on the other hand, when n = 2, significant cavitation can occur at L = 19.2 mm.

FIG. 2 shows the work 2 immersed in the immersion liquid L2.
6 shows how foreign matter and burrs on the surface are removed by the jet nozzle 10A. For example, degassed pure water sent to the liquid path 12 of the jet nozzle 10A is jetted into the degassed pure water (immersion liquid L2) as the cavitation generation liquid L1 through the jet nozzle 10A. . That is, the degassed pure water flows through the liquid passage 12 of the tubular member 14 constituting the injection nozzle 10A, is then discharged from the injection port 16 provided in the tubular member 14, and is further fixed to the clamp base 28. In this state, the workpiece 26 immersed in the immersion liquid L2 is directed and ejected. At this time, a large number of cavitations CA occur due to the friction between the jet flow 22 and the immersion liquid L2.
Burrs, chips, and machine oil (foreign matter) are washed and removed from the work 26 by the erosion force generated as the cavitation CA is destroyed when it collides with the work 26.

Here, degassed pure water having a remarkably low dissolved gas amount is used as the cavitation generating liquid L1 and the immersion liquid L2. Therefore, a high cavitation effect can be obtained. Therefore, since the erosion force generated at this time becomes significantly large, foreign matters and burrs can be efficiently removed.

Moreover, the erosion force of the cavitation CA is remarkably large, so that even if the work has a complicated shape, the burr remaining on the work is surely removed. Of course, optimum deburring can be performed by appropriately adjusting the position where the cavitation CA collides with the work 26.

At the time of the above-mentioned injection, as shown in FIG. 1, since the injection port 16 of the injection unit 20 is sharply narrowed like an orifice with respect to the liquid passage in the injection unit 20, A condensed CO of degassed pure water is generated. Since the contracted flow CO is generated in this manner, a large shear stress that cannot be obtained by the conventional contracted nozzle is generated around the contracted flow CO, and strong cavitation CA is generated from the inside of the jet flow 22. Further, as described above, D1>
Let D2 be the total length L of the injection unit 20 to correspond to the resonance frequency N of the jet flow inside the injection unit 20. That is, since the frequency of vortex generation around the jet flow and the frequency of pressure fluctuation generated in the injection unit 20 are made to correspond to the self-resonance length, the efficiency of cavitation generation can be significantly improved. Therefore, as compared with the conventional contraction nozzles 100 and 110, it is possible to more reliably remove burrs, chips and machine oil (foreign matter) from the work 26. The discharge pressure of the cavitation generating liquid L1 is 2.9 to 1
Since it is set to 9.6 MPa, even if the jet flow of the cavitation generating liquid L1 collides with the work 26, the work 26 is not damaged.

As described above, a work having almost no burrs can be obtained.

If, for example, degassed pure water is used as the cavitation generating liquid L1 and the immersion liquid L2,
It becomes possible to remove foreign matters and burrs from the work 26 efficiently and surely.

FIG. 3 shows an injection nozzle 1 according to the second embodiment.
A cross-sectional view of 0B is shown.

The injection nozzle 10B surrounds the injection port 16 in addition to the tubular member 14 provided with the liquid passage 12 and the injection port 16 provided on the tip wall portion of the tubular member 14. Is provided with a tip 30. And the tip 3
A discharge port 34 having a cylindrical hole portion (recess) 32 is provided at one end portion of 0. The tubular member 14, the injection port 16, and the cylindrical hole 32 are provided at positions where their centers substantially coincide with each other.

Here, the case where the spray nozzle 10B is used for cleaning the work 26 shown in FIG. 2 will be described.

In this injection nozzle 10B, for example, degassed pure water that has flowed through the liquid passage 12 of the tubular member 14 is discharged from the injection port 16 provided in the tubular member 14 as a jet flow 22 into the immersion liquid L2. It At that time, the discharge port 3 of the tip 30
2 is ejected toward the work 26 immersed in the immersion liquid L2 while being fixed to the clamp base 28 via the nozzle 2.
At this time, in addition to the friction between the jet flow 22 and the immersion liquid L2, a strong vortex flow is generated between the jet flow and the immersion liquid L2 in the vicinity of the cylindrical hole 32, so that more cavitation C is generated.
A occurs. Therefore, the injection nozzle 10 of the first embodiment
Compared with the case of A, a further cleaning and removing effect of the work 26 can be obtained.

FIG. 4 compares the amount of erosion of the work 26 by the injection nozzle 10B and the conventional contraction nozzle 110. In this case, the inner diameter D2 of the ejection portion 20 of the ejection nozzle 10B and the inner diameter D3 of the liquid passage 108 of the conventional ejection nozzle 110 are set to the same size. Further, the inner diameter D4 of the discharge port 32 in the injection nozzle 10B
And the inner diameter D5 of the ejection port 114 in the injection nozzle 100.
Are also set to the same size. Then, the cavitation generating liquid L1 was sprayed onto the work 26 for 30 seconds at a pressure of 7 MPa. Comparing the maximum values of the amount of erosion, it was 0.004 g in the case of the injection nozzle 110, but increased to 0.016 g in the case of the injection nozzle 10B. That is, by using the injection nozzle 10B according to the present invention, the erosion amount of 4 times is obtained.

FIG. 5 shows a sectional view of the injection nozzle 10C with the discharge port 34 chamfered.

The jet nozzle 10C has the same construction as the jet nozzle 10B except for the chamfering. As a result of chamfering here, the angle θ formed by the discharge port 34 is 30 °.
It is preferable to set it within the range of 70 °. With such a configuration, a strong vortex can be generated between the jet liquid 22 and the immersion liquid L2 near the discharge port 34 in addition to the immersion liquid L2 near the cylindrical hole portion (recess) 32, Cavitation C over a wider area than the injection nozzle 10B
A occurs. Therefore, a stronger cleaning and removing effect of the work 26 can be obtained.

FIG. 6 shows an injection nozzle 10D having a tapered hole portion 36 in which the cylindrical hole portion (recess) 32 of the injection nozzle 10B or 10C is expanded in a tapered shape. here,
The angle θ formed by the tapered hole portion 36 is preferably set within the range of 30 ° to 70 °. With such a configuration, a strong vortex CW is generated around the jet 22 inside the tapered hole portion 36, and the jet nozzles 10B and 10C are formed.
Compared with, a higher cavitation CA effect is obtained. Therefore, a more effective cleaning and removing effect of the work 26 can be obtained.

FIG. 7 shows an injection nozzle 10E in which a small diameter hole 38 is provided near the injection port 16. Due to the existence of the small-diameter hole portion 38, even when the central axis of the tapered hole portion 36 and the central axis of the injection port 16 are misaligned, the cavitation generating liquid L1 remains in the tapered hole portion 3.
6 is ejected from the vicinity of the central axis. Also in this case, the angle θ formed by the tapered hole portion 36 is 30 ° to 70 °.
It is preferable to set within the range.

The above will be further described below.
In the case of the injection nozzle 10D shown in FIG. 6, if there is a coaxial displacement between the tapered hole portion 32 and the injection port 16, the jet flow 22 may be tilted or cavitation CA in the jet flow 22 may occur.
However, in the injection nozzle 10E shown in FIG. 7, since the small diameter hole portion 38 is provided between the tapered hole portion 36 and the injection hole 16, This is because it is possible to easily eliminate the influence of coaxial displacement. In addition, although the injection nozzle 10E does not need to have high coaxial accuracy as described above,
Compared with the injection nozzle 10D, there is an effect that the decrease in erosion force is suppressed as much as possible. In addition, the injection nozzle 10
The E type does not need to have high coaxial accuracy, and therefore has the further effect of facilitating the production of the machining tool and the machining thereof as compared with the injection nozzle 10D.

In the above embodiment, degassed pure water is used as the spray liquid, but the spray liquid is not limited to this liquid, and degassed water, water or the like may be used.

FIG. 8 shows an injection nozzle 1 according to the third embodiment.
Indicates 0F.

This is because the cylindrical hole portion (recess) 32 of the jet nozzle 10B shown in FIG. 3 is formed as a tip member 40F in which the tip portion 30 is separate from the jet nozzle 10B. Therefore, the injection member 42F of the injection nozzle 10F
Is a diversion of the injection nozzle 10A. By making the tip member 40F replaceable, even if the cylindrical hole portion (recess) 32 due to cavitation CA is worn, for example, only the tip member 40F needs to be replaced. Therefore, the injection nozzle 10F itself is replaced. do not have to.
Further, when it is desired to change the shape of the injection nozzle 10F according to the type of the work 26, it is only necessary to replace the tip member 40F having a different shape. Therefore, the cost required for the injection nozzle 10F can be reduced. Further, as a constituent material of the tip member 40F, a material having good wear resistance such as a hardened metal, a cemented carbide, or a ceramic is suitable. The tip member 40F and the injection member 42 are
As a method of combining with F, when it is exchangeable, it is connected by a screw or the like, and when it is not necessary to be exchangeable after setting conditions, for example, brazing, welding,
Any method such as press fitting or heat fusion may be used.

Therefore, the injection nozzle 1 according to the second embodiment
The tip end portions 30 of 0B to 10E can be formed as a tip end member separately from the jet nozzle.

That is, the injection nozzle 10C can be transformed into the injection nozzle 10G shown in FIG. This injection nozzle 10G is provided with a tip member 40 whose chamfered discharge port 30.
G and the injection member 42G are provided.

Further, as shown in FIG.
It may be the injection nozzle 10H obtained by modifying 0D. The jet nozzle 10H includes a tip member 40H having a tapered hole portion 36 having a tapered diameter and a jet member 42H.

Further, as shown in FIG. 11, the injection nozzle 1
The injection nozzle 10I obtained by modifying 0E may be used. In this injection nozzle 10I, the end portion of the injection port 16 has a small diameter hole portion 38.
And a tip member 40I having a tapered hole portion 36 having a tapered diameter, and an injection member 42H.

FIG. 12 shows an injection nozzle 1 according to the fourth embodiment.
Indicates 0J. The injection nozzle 10J has a ring member 44 disposed inside the tip wall surface of the tubular portion 18, and the ring member 44 has a hollow portion 46. When the size of the injection port 16 of the injection nozzle 10J, the nozzle injection pressure, etc. are changed, the above-mentioned L dimension may be adjusted in order to obtain the optimum resonance of the jet flow. By changing it, the L dimension can be easily adjusted. Therefore, it is not necessary to newly manufacture the injection nozzle 10J, and the manufacturing cost of the injection nozzle 10J can be reduced. In addition, this ring member 44
Is not limited to the injection nozzle 10J according to the present embodiment, but may be the first
It goes without saying that the invention can also be applied to the injection nozzle of the third embodiment.

[0049]

According to the ejection nozzle of the present invention, the ejection port is sharply narrowed like an orifice, and the cross-sectional area of the ejection unit having the ejection port is the cylindrical shape for supplying the liquid to the ejection unit. Since it is formed so as to be smaller than the cross-sectional area of the portion, a contraction flow is generated and self-resonance is caused in the injection portion, so that significant cavitation can be realized. Therefore, foreign matters such as burrs, chips and machine oil of the work can be efficiently washed and removed. Therefore, an effect that a clean and burr-free work can be obtained is achieved. If a liquid that has been degassed in advance by the degassing means is jetted as the jet liquid, a further cleaning and removing effect can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an injection nozzle according to a first embodiment.

FIG. 2 is a diagram showing a work of cleaning and removing a work by an injection nozzle.

FIG. 3 is a view showing a cross section of an injection nozzle according to a second embodiment, which is provided with a projecting end portion surrounding an injection port.

FIG. 4 is a diagram comparing the amounts of erosion of the injection nozzle of FIG. 3 and a conventional injection (contraction) nozzle with respect to a work.

FIG. 5 is a cross-sectional view of an injection nozzle in which a discharge port of the injection nozzle is chamfered.

FIG. 6 is a cross-sectional view of an injection nozzle including a tip end portion having a tapered hole portion.

FIG. 7 is a cross-sectional view of an injection nozzle in which a small diameter hole portion is provided near the injection port of the injection nozzle.

FIG. 8 is a view showing a cross section of an injection nozzle according to a third embodiment, which is composed of a tip member and an injection member.

FIG. 9 is a view showing a cross section of an injection nozzle in which a tip of a tip member is chamfered.

FIG. 10 is a cross-sectional view of an injection nozzle including a tip member having a tapered hole portion.

FIG. 11 is a cross-sectional view of an injection nozzle including a tip member having a small diameter hole portion and a tapered hole portion.

FIG. 12 is a cross-sectional view of an injection nozzle in which a ring member is arranged inside a tip wall surface of a tubular portion.

FIG. 13 is a sectional view of an injection (contraction) nozzle according to the related art.

FIG. 14 is a cross-sectional view of an injection (contraction) nozzle according to the related art.

[Explanation of Codes] 10A to 10J, 100, 110 ... Injection nozzle 12, 108 ... Liquid path 14 ... Cylindrical member 16, 106 ... Injection port 18 ... Cylindrical part 20 ... Injection part 22 ... Jet flow 24 ... Intersection 26 ... Workpiece 28 ... Clamping base 30, 112 ... Tip 32 ... Cylindrical hole (recess) 34 ... Discharge port 36 ... Tapered hole 38 ... Small diameter hole 40F-40I ... Tip member 42F-42I ...
Injection member 44 ... Ring member 46 ... Hollow part L1 ... Cavitation generation liquid L2 ... Immersion liquid CA ... Cavitation CO ... Contraction CW ... Vortex flow D1 ... Cylindrical part inner diameter D2 ... Injection part inner diameter D3 ... Liquid channel inner diameter D4 , D5 ... Inner diameter of discharge port L ... Total length of injection part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryoji Kobayashi             2-8 Yagiyamahonmachi, Taihaku-ku, Sendai City, Miyagi Prefecture             No. 13 F-term (reference) 3B201 AA46 AB01 BB02 BB32 BB92                       BB93                 4F033 AA04 BA03 BA04 CA01 DA01                       EA01 NA01

Claims (13)

[Claims] 1. A jet nozzle for generating cavitation in a second liquid by jetting a first liquid into a second liquid from a jet port, the liquid flowing through the first liquid to the jet port. A tubular portion provided with a passage and an injection portion having an injection port that is provided in a tip wall portion of the tubular portion and is sharply narrowed in an orifice shape, and a cross-sectional area of the injection portion is An injection nozzle characterized by being smaller than the cross-sectional area of the tubular portion. 2. The jet nozzle according to claim 1, wherein the jet nozzle has a projecting end portion surrounding the jet port, and a discharge port communicating with the jet port is provided at the projecting end portion. Injection nozzle to do. 3. An injection nozzle for causing cavitation in the second liquid by injecting the first liquid into the second liquid from the injection port, the injection port being sharply narrowed in the shape of an orifice. An injection nozzle comprising: an injection member provided; and a tip member that includes a discharge port communicating with the injection port and that can be fitted into a tip wall surface of the injection member. 4. The jet nozzle according to claim 3, wherein the jet member includes a tubular portion provided with a liquid passage for flowing the first liquid to the jet port, and a tip wall portion of the tubular portion. An injection nozzle which is provided and has an injection port which is sharply narrowed into an orifice shape, wherein the injection member has a cross-sectional area smaller than that of the tubular member. 5. The injection nozzle according to claim 2 or 3, wherein the tip of the ejection port is chamfered. 6. The injection nozzle according to claim 2 or 3, wherein the discharge port has a tapered portion that widens in a tapered shape. 7. The injection nozzle according to any one of claims 1 to 4, wherein a ring member is arranged inside the tip wall surface of the tubular portion. 8. The injection nozzle according to any one of claims 1 to 7, wherein the inflow side end of the injection port is processed into an arc shape. 9. The jet nozzle according to claim 1, wherein the jet length inside the jet passage is adjusted by adjusting the total length of the jet portion and the lengths of the jet portion and the ring member. An injection nozzle characterized by changing the resonance frequency of the injection nozzle. 10. The jet nozzle according to claim 1, wherein the jet nozzle is a jet nozzle that deburrs or cleans a workpiece immersed in the second liquid. An injection nozzle characterized by. 11. The injection nozzle according to claim 1, wherein the first liquid is a degassed liquid. 12. The injection nozzle according to claim 11, wherein the first liquid and the second liquid are degassed liquids. 13. The injection nozzle according to claim 12, wherein the first liquid and the second liquid are degassed water.