JP4580198B2 - Liquid jet nozzle - Google Patents

Description

  The present invention relates to a liquid jet nozzle suitable for jetting a liquid, particularly a liquid having a higher viscosity than water.

  2. Description of the Related Art Liquid injection nozzles that inject liquid from nozzle openings are frequently used in fields such as painting and fire extinguishing. In both fields of painting and fire extinguishing, it is preferable from the viewpoint of efficient application and fire extinguishing that a liquid such as a paint or a fire extinguishing agent sprayed from the nozzle port covers a large area.

  In particular, from the viewpoint of fire extinguishing, it is necessary to efficiently spray and spray fire extinguishing agents within a short period of time to prevent burning, and a small amount of extinguishing agents that are not expected to be used in large quantities. For example, in the case of a fire in a moving vehicle or an office fire in a high-rise building where water discharge from a fire hydrant or an outdoor fire hydrant does not reach, Is required to be efficiently sprayed and extinguished.

  In response to such a demand, polymer water in which a polymer is contained in water has been proposed as a chemical having a high fire extinguishing ability. Polymer water causes thickening gelation when the temperature rises, and has the property of sticking and staying on the surface of the combustion product, and exhibits high fire extinguishing ability with a small amount of use.

  However, since the viscosity of polymer water is approximately several to several tens of times higher than that of water, even if polymer water is jetted with a liquid jet nozzle in which the central hole into which the liquid is pumped is formed in a simple straight shape, it is rod-shaped It is only injected.

  Further, the central hole 1 through which the liquid is pumped as shown in FIG. 10 is a liquid jet nozzle 2 formed by bending the liquid flow path 90 degrees before the nozzle opening so as to diffuse using a swirl flow. Even if it is jetted, in the case of a highly viscous liquid such as polymer water, the polymer water is merely jetted in a rod shape. For example, the polymer water spraying area 3 at a position about 2.3 m away from the nozzle mouth is at most There is a problem that it is about φ600 mm and cannot be diffused over a wide range.

  A nozzle provided with a diffusion plate has been proposed as a liquid jet nozzle that can be diffused and jetted even with such a high-viscosity liquid (see, for example, Patent Document 1). FIG. 11 is a cross-sectional view showing a simplified configuration of the nozzle 5 including the diffusion plate 4 in the prior art. In the prior art nozzle 5 disclosed in Patent Document 1, a diffusion plate 4 is provided at the nozzle opening to spread the spray liquid and air so as to spread in a direction substantially perpendicular to the axis 6 of the nozzle 5.

  In the nozzle 5 of the prior art, two fluids of the spray liquid and air are used, and the fluid ejected from the nozzle port is diffused in the direction substantially perpendicular to the axis 6 on the diffusion plate 4. Even if it exists, it can be sufficiently diffused. However, the nozzle 5 of the prior art is used, for example, for coating a chemical reaction tank repair glaze on a narrow part of the chemical reaction tank that cannot be applied with the nozzle facing the nozzle. That is, the nozzle 5 is suitable for coating the inner wall of the pipe portion in the direction perpendicular to the axis 6 by inserting the nozzle 5 into a pipe portion having a narrow interior and moving it forward and backward in the direction of the axis 6. . However, when the nozzle 5 is used for fire extinguishing, for example, even if the liquid is jetted from the nozzle 5 to the fire extinguishing target, the liquid diffuses in the direction perpendicular to the axis 6 by the diffusion plate 4 and the shape of the spray area Since it becomes an annular shape, there is a problem in that it is not sprayed on the fire extinguishing object corresponding to the central portion of the ring and the fire extinguishing effect cannot be exhibited. Further, the conventional nozzle 5 has a problem that it cannot be sufficiently diffused unless two fluids such as a spray liquid and air are used.

  Therefore, there is provided a liquid jet nozzle capable of sufficiently diffusing a high-viscosity liquid having excellent fire extinguishing capability, such as polymer water, without using two fluids, and spraying without losing a wide area. It is sought after.

JP 2000-84440 A

  An object of the present invention is to provide a nozzle for liquid injection that has a simple structure, can be sufficiently diffused and sprayed from a low-viscosity liquid to a high-viscosity liquid without losing a wide area. is there.

The present invention relates to a liquid jet nozzle that jets liquid from a nozzle port.
A nozzle body formed so as to be connected to the nozzle opening and having a central hole through which liquid is pumped, and an orifice portion being formed in the middle hole in the liquid pumping direction;
A nozzle shaft body provided so as to extend from the inside of the nozzle body to the outside and pass through the orifice portion,
A narrow-diameter portion formed extending in the liquid pumping direction;
A flange portion provided at one end of the small diameter portion in the liquid pumping direction and formed to protrude in a direction perpendicular to the axis of the nozzle body ;
Continuous with one liquid pumping direction against the flange portion, and the air-guiding portion is formed to have a reduced closes frustoconical inclined or hemispherical curved surface towards the end,
A shaft base portion formed at the other end in the liquid pumping direction of the small diameter portion ,
A nozzle shaft body relative positions that provided variably in the liquid pumping direction with respect to the orifice portion,
A nozzle body holding portion that is formed with a holding hole that penetrates in the liquid pumping direction and has an inner dimension that decreases toward one side in the liquid pumping direction, and the shaft base portion is disposed inside the holding hole. And a shaft body holding portion to which the nozzle body is mounted so as to be able to advance and retreat by the screwing .

  Further, according to the present invention, the nozzle shaft body is formed with a truncated cone-shaped inclined surface that expands toward the end portion between the flange portion and the flow guide portion.

  In the invention, it is preferable that the liquid ejected from the nozzle opening is a liquid having a viscosity equal to or higher than that of water and equal to or lower than that of the liquid containing the polymer.

  According to the present invention, the nozzle shaft body that is provided through the orifice portion of the nozzle body includes a flange portion that protrudes in a direction perpendicular to the axis, and a flange portion that is continuous with the flange portion and contracts toward the end portion. And a flow guide portion formed to have a truncated cone-shaped inclined surface or a hemispherical curved surface. The liquid thus ejected is diffused at the flange portion and guided by the flow guide portion, so that even a liquid having a high viscosity does not cause a lacking region such as a ring. Without using two fluids, it can be diffused and sprayed over a wide area.

  Furthermore, when the liquid having a high viscosity is, for example, a fire extinguishing agent, the agent having excellent fire extinguishing ability can be sufficiently diffused and jetted without lacking in a wide area, so that effective fire extinguishing can be realized with a small amount of agent. It becomes possible.

Also, the orifice of the nozzle shaft body and the nozzle body, the relative position in the axial direction is provided variably, thereby the relative position of the various parts of the orifice portion and the nozzle shaft member freely changed. As a result, the axial position of the orifice portion and the flange portion can be made to coincide with each other so that the liquid can be prevented from diffusing and sprayed to the far side, and the upstream side of the orifice portion and the flange portion of the nozzle shaft body in the liquid pumping direction. It is also possible to make the relative position with the small diameter portion coincide with each other so that the liquid is sufficiently diffused and sprayed to a short distance region.
In addition, by rotating the nozzle body relative to the shaft body holding portion, the relative position between the nozzle body and the shaft body holding portion can be changed. Therefore, it is possible to switch between injection that emphasizes diffusion and injection that emphasizes long throwing that reaches a relatively long distance, although the spray region is slightly narrowed.

  Further, according to the present invention, the nozzle shaft body is formed with the truncated cone-shaped inclined surface that expands toward the end portion between the flange portion and the flow guide portion. The excess liquid can also be diffused.

  According to the present invention, since the liquid is a liquid having a viscosity equal to or higher than the viscosity of water and equal to or lower than the viscosity of the liquid containing the polymer, the polymer water having a viscosity higher than that of water and excellent in fire extinguishing ability is low. Even for such drugs, a liquid ejecting nozzle suitable for ejecting a liquid having a wide range of viscosity, that is, a fire extinguishing nozzle is realized.

  FIG. 1 is an exploded cross-sectional view showing a simplified configuration of a liquid jet nozzle 10 according to a first embodiment of the present invention, and FIG. 2 is an assembled cross-sectional view of the liquid jet nozzle 10 shown in FIG.

  The liquid ejecting nozzle 10 has a central hole 12 formed so as to be connected to the nozzle port 11 and pumped by liquid, and a nozzle body 14 in which an orifice portion 13 is formed in the middle of the liquid feeding direction of the central hole 12; The nozzle body 14 extends from the inside to the outside and is inserted through the orifice portion 13, and is connected to the flange portion 16 and the flange portion 16 formed to project in a direction perpendicular to the axis 15 of the nozzle body 14. And a nozzle shaft body 18 including a flow guide portion 17 formed so as to have a hemispherical curved surface that is contracted toward the end portion.

  Such a liquid jet nozzle 10 is used, for example, for spraying a liquid such as a fire extinguishing agent, a paint, a pesticide, or the like from a nozzle port 11 and spraying or applying it.

  The nozzle body 14 is a member made of a substantially cylindrical metal such as brass or stainless steel. A nozzle port 11 that is a liquid injection port is formed at one end of the nozzle body 14, and a central hole 12 is formed so as to penetrate the nozzle body 14 in the direction of the axis 15 and continue to the nozzle port 11. The central hole 12 is formed with an orifice portion 13 that narrows the cross-sectional area of the liquid flow path in the middle of the liquid feeding direction indicated by an arrow 21. In the central hole 12, an orifice inclined surface 22 having a truncated cone-shaped inclined surface is formed on the upstream side in the liquid pumping direction in the vicinity of the nozzle port 11 so that the flow passage cross-sectional area of the liquid once contracts. The surface 22 continues to the orifice portion 13. A nozzle port 11 having a truncated cone-shaped inclined surface is formed on the downstream side in the liquid pumping direction of the orifice portion 13 so as to expand toward the outer side of the nozzle body 14.

  The nozzle shaft body 18 is made of metal, for example, brass or stainless steel, and has a cylindrical shaft base portion 23 and a shaft rod portion mounted on the shaft base portion 23 so as to protrude from one bottom surface thereof. 24.

  FIG. 1A is a view of the nozzle shaft body 18 as viewed from the other bottom surface side of the shaft base portion 23, and FIG. 1B is a partial cross-sectional view as viewed from the side surface of the nozzle shaft body 18. The shaft base portion 23 is formed with five holes penetrating in the height direction of the cylinder. One hole is formed in the cylindrical shaft center portion of the shaft base portion 23, and the shaft rod portion 24 is mounted in this hole, and hence is referred to as a mounting hole 25. A female screw is engraved on the inner wall of the mounting hole 25. Around the mounting hole 25, four through holes having the same shape are formed at equal intervals, and the through holes are called flow holes 26 because the liquid to be ejected flows therethrough.

  The shaft rod portion 24 includes a small diameter portion 31 and a flange portion 16 formed to protrude in a direction perpendicular to the axis 15 at one end portion of the small diameter portion 31 on the downstream side in the liquid pumping direction, A flow guide portion 17 having a hemispherical curved surface that is continuous with the flange portion 16 and contracts toward the end portion is formed. In addition, a male screw is engraved at the other end portion of the shaft rod portion 24 upstream in the liquid pumping direction, and the male screw portion is screwed into the female screw portion of the mounting hole 25 of the shaft base portion 23. The shaft rod portion 24 is detachably attached to the shaft base portion 23 to constitute the nozzle shaft body 18.

  The nozzle shaft body 18 is press-fitted into the central hole 12 of the nozzle body 14 with the shaft rod portion 24 facing downstream in the liquid pumping direction, and the shaft base portion 23 is upstream of the orifice portion 13 of the central hole 12 in the liquid pumping direction. It is mounted at a position where it abuts on the stepped portion 27 formed on the side. At this time, the shaft rod portion 24 of the nozzle shaft body 18 extends through the orifice portion 13 from the inside of the nozzle main body 14 to the outside, and the flange portion 16 and the flow guide portion 17 are disposed outside the nozzle main body 14. It is provided to be located in the direction.

  According to such a liquid ejecting nozzle 10, even a liquid having a high viscosity can be diffused and ejected over a wide area without causing a lacking area such as a ring or using two fluids. Can do.

  FIG. 3 is a diagram for explaining the outline of the liquid ejection in the liquid ejection nozzle 10. With reference to FIG. 3, the liquid ejection in the liquid ejection nozzle 10 will be described.

  The liquid that is pumped from the liquid supply source and flows into the central hole 12 of the nozzle body 14 flows through the flow hole 26 of the shaft base portion 23, and further, the orifice portion 13 and the small diameter portion 31 of the shaft rod portion 24. The gap formed by the nozzles 11 flows in the direction of the arrow 28 and is ejected outward from the nozzle port 11. The liquid jetted outward flows along the narrow diameter portion 31 and collides with the flange portion 16 formed to project in the direction perpendicular to the axis 15. The liquid flow indicated by the arrow 28 colliding with the flange portion 16 is diffused by colliding with the flange 16. This diffusion direction varies with the separation distance from the surface of the narrow diameter portion 31 of the liquid flow indicated by the arrow 28. That is, as shown in an enlarged view in FIG. 3 (b), the flow 28 a closest to the surface of the narrow diameter portion 31 is diffused in the direction 29 a substantially perpendicular to the axis 15 and collides with the edge portion of the flange portion 16. The flow 28c is diffused in a direction 29c having a large angle with respect to the flange portion 16, and the flow 28b at an intermediate position between the flow 28a and the flow 28c is perpendicular to the previous axis 15 with respect to the direction 29a and the flange portion 16. It diffuses in an intermediate direction 29b with a direction 29c having a large angle. In this manner, even the liquid having a high viscosity is uniformly diffused in a wide range of directions by forming the flange portion 16 in the liquid jet nozzle 10.

  A further feature of the liquid jet nozzle 10 of the present invention resides in a flow guide portion 17 formed continuously to the flange portion 16. By forming the flow guide portion 17, the liquid flowing along the narrow diameter portion 31 collides with the flange portion 16 and diffuses in the direction of the arrows 29 a, 29 b, and 29 c, and also flows into the flow guide portion 17. A flow in the direction of the arrow 30 is also formed. In particular, in the case of a liquid having a high viscosity, a flow along the surface of the flow guide portion 17 is more easily formed by the action of the adhesive force on the flow guide portion 17 due to the viscosity. As a result, the liquid ejected from the liquid ejecting nozzle 10 is sufficiently diffused over a wide range and sprayed to the central part of the spraying area, so that the spraying area that does not cause an annular defect is formed. Can be formed.

  An example of a fire-extinguishing agent that is water containing a polymer as the liquid to be ejected is as follows. In this embodiment, an emulsion in which a polymer is dispersed in water with a surfactant is used as water containing the polymer. The content of the polymer is 0.1% by weight with respect to the whole polymer water. The viscosity of the polymer-containing water is about 5.0 mPa · s at 30 ° C., which is about 6 times higher than the viscosity of only water at 30 ° C. of about 0.8 mPa · s.

  When such polymer water is jetted from the liquid jet nozzle 10 at a pressure of about 0.7 MPa, the polymer water spraying region 32 at a position separated by about 2.3 m from the nozzle port 11 is as shown in FIG. Furthermore, it has a diameter of 2,500 mm and has a circular shape, so that a defect region at the center is not generated.

  In order to diffuse the polymer water in a wide range as shown in FIG. 4 with a general nozzle, a pressure of 4 to 10 MPa is required. However, according to the liquid jet nozzle 10 of the present embodiment, as described above, In addition, since it is possible to diffuse and spray over a wide range with a small pressure, the operation is easy, and when the nozzle is fixedly used, the structure of the nozzle holding member can be simplified.

Furthermore, 500 mL (milliliters) of n-heptane is injected as a combustion product into an oil pan having an opening of 0.2 m ² , and polymer-containing water is sprayed and sprayed by the liquid jet nozzle 10 against a simulated fire that is ignited. When a fire extinguishing experiment was conducted, the fire was extinguished in about 15 seconds at a flow rate of only 9 L / min. Since polymer water having a high fire extinguishing capability can be diffused and sprayed over a wide range by the liquid jet nozzle 10, efficient fire extinguishing is realized with a small amount of fire extinguishing agent.

  In this way, the liquid jet nozzle 10 allows the fire extinguishing agent to be effectively extinguished by using a small amount of the extinguishing agent by diffusing and jetting the extinguishing agent over a wide range, and thus a large amount of the extinguishing agent can be used. However, it can be suitably used as a fire-extinguishing-agent-injecting nozzle at the end of a fire-extinguishing facility, for example, in a moving vehicle or an office in a high-rise building where a fire must be dealt with with a small amount of stored fire-extinguishing agent. In addition, it is also useful as a sprinkler nozzle for general houses and a nozzle for foam fire extinguishing equipment such as a parking lot in order to reduce damage to household goods due to a large amount of use of fire extinguishing agents.

  FIG. 5 is an exploded cross-sectional view showing a simplified configuration of the liquid jet nozzle 40 according to the second embodiment of the present invention. FIG. 6 is an assembled cross-sectional view of the liquid jet nozzle 40 shown in FIG. It is. The liquid ejecting nozzle 40 of the present embodiment is similar to and corresponds to the liquid ejecting nozzle 10 of the first embodiment, and the description thereof is omitted.

  It should be noted in the liquid jet nozzle 40 of the present embodiment that the relative position in the direction of the axis 15 is variably provided between the nozzle shaft body 41 and the orifice portion 13 of the nozzle body 42.

  The nozzle body 42 is a member made of a substantially cylindrical metal such as brass or stainless steel, like the nozzle body 14 of the first embodiment. Only differences from the nozzle body 14 of the first embodiment will be described below. A cover portion 43 is formed so as to protrude outward from the peripheral portion of the nozzle port 11 and circulate around the nozzle port 11. Further, an internal thread portion 44 is formed on the inner wall of the central hole 12 by engraving a female screw on the upstream side in the liquid pumping direction from the substantially central portion in the direction of the axis 15. Two fixing holes 45 penetrating from the outer surface of the nozzle body 42 toward the central hole 12 are formed near the other end portion in the direction of the axis 15 of the nozzle body 42 at opposing positions. The fixing hole 45 has a female screw engraved on its inner wall and is screwed with a set screw 62 described later.

  FIG. 5A shows the nozzle shaft body 41. The shaft base portion 23 of the nozzle shaft body 41 is formed in the same manner as the shaft base portion 23 of the first embodiment. The shaft rod portion 46 of the nozzle shaft body 41 includes a narrow-diameter portion 31, a flange portion 47 formed to project in a direction perpendicular to the axis 15 at one end on the downstream side in the liquid pumping direction, and a flange portion 47. A slowly diffusing portion 48 composed of a truncated cone-shaped inclined surface extending toward the end, and a flow guide portion 17 having a hemispherical curved surface connected to the slowly diffusing portion 48 and contracted toward the end. It is formed.

  The length in the direction of the axis 15 of the flange portion 47 formed in the shaft rod portion 46 of the present embodiment is longer than the length in the direction of the axis 15 of the flange portion 16 formed in the shaft rod portion 24 of the first embodiment. It is formed. In the liquid jet nozzle 40 of this embodiment, the relative position of the nozzle body 42 and the nozzle shaft body 41 in the direction of the axis 15 is variably configured, so the relative position of the shaft bar portion 46 with respect to the orifice portion 13 is changed. The length of the flange portion 47 is formed long so that the position of the orifice portion 13 and the flange portion 47 in the direction of the axis 15 can be easily matched.

  The slow diffusion portion 48 connected to the flange portion 47 is formed so that the flow of the liquid along the flange portion 47 can be further diffused since the flange portion 47 is formed long in the direction of the axis 15. However, if it is formed so as to spread in a direction perpendicular to the axis 15, the liquid is prevented from being ejected to a long distance at the time of long throwing, which will be described later, so that it is formed to have an inclined surface with respect to the axis 15. The

  Further, the other end portion of the shaft rod portion 46 on the upstream side in the liquid pumping direction is engraved with a male screw and screwed to the shaft base portion 23 in the same manner as in the first embodiment.

  In the liquid jet nozzle 40 of the present embodiment, the nozzle shaft body 41 is not directly mounted on the nozzle main body 42 but is mounted on the shaft body holding member 51. The shaft body holding member 51 also has a substantially cylindrical shape, and is a member made of metal such as brass or stainless steel.

  The shaft body holding member 51 is formed with a holding hole 52 penetrating in the direction of the axis 15. Three first to third step portions 53, 54, and 55 are formed in the holding hole 52 so that the cross-sectional area in the vertical cross section with respect to the axis 15 decreases in the liquid feeding direction. The nozzle shaft body 41 is inserted into the holding hole 52 and is press-fitted so that the shaft base portion 23 contacts the second stepped portion 54. At this time, the nozzle shaft body 41 is mounted and held on the shaft body holding member 51 so that the shaft rod portion 46 passes through the holding hole 52 of the shaft body holding member 51 and protrudes from the inside to the outside. .

  An annular recess 56 is formed on the outer periphery of the shaft body holding member 51 so as to reduce its thickness in the vicinity of one end. The annular recess 56 is fitted with an O (O) ring 58 as a packing, and when the shaft body holding member 51 is mounted on the nozzle body 42, liquid is supplied from the gap between the shaft body holding member 51 and the nozzle body 42. Prevent leakage.

  A first annular projecting portion 59 is formed in a flange shape at a substantially central portion of the shaft body holding member 51 in the direction of the axis 15. The first annular protrusion 59 is engraved with an external thread to form an external thread 60. The first annular protrusion 59 is formed such that its outer diameter matches the inner diameter of the inner threaded portion 44 of the central hole 12 of the nozzle body 42.

  A second annular projecting portion 61 is formed in a flange shape on the downstream side of the shaft body holding member 51 in the liquid pumping direction. The second annular protrusion 61 is formed in such a dimension that the outer diameter of the flange-like portion can abut on the other end face 42 a of the nozzle body 42. That is, the second annular projecting portion 61 acts as a stopper that defines a limit of movement of the nozzle body 42 that moves relative to the shaft body holding member 51 in the direction of the axis 15 toward the upstream side in the liquid pressure feeding direction.

  The external thread portion 60 formed in the first annular projecting portion 59 of the shaft body holding member 51 into which the nozzle shaft body 41 is press-fitted is screwed into the internal thread portion 44 formed in the central hole 12 of the nozzle body 42. As a result, the shaft body holding member 51 and thus the nozzle shaft body 41 can be attached to the nozzle body 42.

  Since the nozzle shaft body 41 is fixed to the shaft body holding member 51, the relative positional relationship between the two remains unchanged, but the shaft body holding member 51 and the nozzle body 42 are composed of the outer screw portion 60 and the inner screw portion 44. Since only being screwed, the nozzle body 42 can be advanced and retracted in the direction of the axis 15 by rotating the nozzle body 42 around the axis 15. That is, the relative position between the nozzle body 42 and the shaft body holding member 51 and the relative position between the nozzle body 42 and the nozzle shaft body 41 can be changed. As a result, the relative position of the shaft rod portion 46 of the nozzle shaft body 41 with respect to the orifice portion 13 of the nozzle body 42 can be changed.

  The relative position between the nozzle body 42 and the nozzle shaft body 41 is determined, and the positioned state can be fixed by screwing the set screw 62 into the fixing hole 45 and tightening.

  The relative positions of the nozzle body 42 and the nozzle shaft 41 during the diffusion shown in FIG. 6 are as follows. At the time of diffusion, the nozzle body 42 is tightened until it reaches a position where it abuts on the second annular protrusion 61 of the shaft body holding member 51. At this time, the relative position between the orifice portion 13 and the shaft rod portion 46 is such that the small diameter portion 31 of the shaft rod portion 46 coincides with the orifice portion 13.

  FIG. 7 is a diagram illustrating an outline of liquid ejection when the liquid ejection nozzle 40 is diffused. With reference to FIG. 7, the liquid ejection at the time of diffusion in the liquid ejection nozzle 40 will be described.

  The liquid that is pumped from the liquid supply source and flows into the holding hole 52 of the shaft body holding member 51 flows through the flow-through hole 26 of the shaft base portion 23, and is similarly pumped through the holding hole 52. And the small diameter portion 31 of the shaft rod portion 46 flows in the direction of the arrow 65 and is ejected outward from the nozzle port 11. The liquid jetted outward collides with the flange portion 47, is diffused in a wide range of directions indicated by arrows 66a, 66b, and 66c, and has an arrow along a side surface parallel to the direction of the axis 15 of the flange portion 47. It also flows in 67 directions. The flow of the liquid in the direction of the arrow 67 is further diffused in the direction of the arrow 68 so as to have a slight inclination angle with respect to the axis 15 by the slow diffusion portion 48 and flows in the direction of the arrow 69 along the flow guide portion 17. Is also formed and injected.

  Therefore, at the time of diffusion shown in FIGS. 6 and 7, similarly to the liquid jet nozzle 10 of the first embodiment, a sufficiently diffused wide-spreading region is formed for a relatively short-distance ejection target. Is injected as follows.

  FIG. 8 is an assembly cross-sectional view of the liquid ejecting nozzle 40 shown in FIG. 5 during long throwing, and FIG. 9 is a diagram for explaining the outline of liquid ejection when the liquid ejecting nozzle 40 is long throwed. Here, the long throw means that the liquid is ejected to a long distance after accepting that the area of the spraying area is slightly reduced.

  At the time of long throw, the nozzle body 42 moves to the downstream side in the liquid pressure feeding direction by loosening the screwing of the outer screw portion 60 and the inner screw portion 44, and the orifice portion 13 and the flange portion 47 of the shaft rod portion 46 coincide with each other. To be positioned. In the liquid jet nozzle 40 of the present embodiment, the length of the flange portion 47 in the direction of the axis 15 is formed long, so that the orifice portion 13 can be easily aligned with the flange portion 47.

  With reference to FIG. 9, the liquid ejection at the time of long throw in the liquid ejection nozzle 40 will be described. The liquid that is pumped from the liquid supply source and flows into the holding hole 52 of the shaft body holding member 51 flows through the flow-through hole 26 of the shaft base portion 23 and is similarly pumped through the holding hole 52, and further, the nozzle body 42. Through the central hole 12, a gap formed by the orifice portion 13 and the flange portion 47 of the shaft rod portion 46 flows in the direction of the arrow 71 and is ejected outward from the nozzle port 11.

  During the long-distance casting, the projecting portion of the flange portion 47 is located in the central hole 12, so that the jetted liquid is not diffused in the direction perpendicular to the axis 15 by the flange portion 47. The flow in the direction of the arrow 71 along the side surface parallel to the direction of the axis 15 of the flange 47 injected from the nozzle port 11 is directed in the direction of the arrow 72 so that the gentle diffusion portion 48 has a slight inclination angle with respect to the axis 15. While being diffused, a flow in the direction of the arrow 73 along the flow guide portion 17 is also formed and injected.

  Thus, in the arrangement of the nozzle main body 42 and the nozzle shaft body 41 at the time of long throwing, since the energy of the liquid to be ejected is not greatly consumed for diffusion, the liquid to be ejected may reach far away. it can. In addition, since the liquid ejection nozzle 40 includes the slow diffusion portion 48, a wider range of spraying region can be formed as compared with the case where the liquid is ejected by a simple straight nozzle.

  As described above, in the liquid jet nozzle 40 according to the present embodiment, the jet main body 42 is jetted with an emphasis on diffusion so that a sufficient spraying region can be obtained at a relatively short distance by a simple operation of rotating the nozzle body 42 around the axis 15. Although the spray area is slightly narrowed, it is possible to switch and use injection that emphasizes long throwing to reach a relatively long distance. Further, like the liquid jet nozzle 10 of the first embodiment, the liquid jet nozzle 40 is suitable for use with a fire extinguishing agent having a high viscosity and a high fire extinguishing capability. It is possible to effectively spray and spray depending on the cause. For example, by attaching the liquid jet nozzle 40 to a fire extinguishing hand gun and connecting the hand gun to a portable fire extinguishing agent storage container equipped with a pressurizing means, for example, it is possible to perform fire extinguishing activities with light equipment. It can be suitably used for highway rescue teams that are required to perform fire extinguishing activities without being constrained by fire hydrants or fire engines, fire fighting teams engaged in initial fire fighting activities in factories, and the like.

  As described above, in the present embodiment, in the liquid ejecting nozzle 40, the nozzle shaft body 41 is mounted on the shaft body holding member 51, and the shaft body holding member 51 is further mounted on the nozzle body 42. However, the present invention is not limited to this, and the shaft body holding member 51 may not be included. For example, the nozzle shaft body may be directly fixed to the hand gun and mounted so that the nozzle body can be moved back and forth with the hand gun.

1 is an exploded cross-sectional view showing a simplified configuration of a liquid jet nozzle 10 according to a first embodiment of the present invention. FIG. 2 is an assembly cross-sectional view of the liquid jet nozzle 10 shown in FIG. 1. FIG. 3 is a diagram illustrating an outline of liquid ejection in the liquid ejection nozzle. FIG. 3 is a diagram illustrating an example of a spray area 31 by a liquid jet nozzle 10. It is a disassembled sectional view which simplifies and shows the structure of the nozzle 40 for liquid injection which is the 2nd Embodiment of this invention. FIG. 6 is an assembled cross-sectional view of the liquid ejecting nozzle 40 shown in FIG. 5 at the time of diffusion. It is a figure explaining the outline | summary of the liquid ejection at the time of the spreading | diffusion of the nozzle 40 for liquid ejection. FIG. 6 is an assembly cross-sectional view of the liquid ejecting nozzle 40 shown in FIG. It is a figure explaining the outline | summary of the liquid ejection at the time of the long throw of the liquid ejecting nozzle. It is a figure which shows the structure of the liquid injection nozzle 2 of a prior art, and the distribution area | region 3 of a liquid. It is sectional drawing which simplifies and shows the structure of the nozzle 5 provided with the diffusion plate 4 in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,40 Nozzle for liquid injection 11 Nozzle port 12 Center hole 13 Orifice part 14,42 Nozzle main body 15 Axis 16,47 Flange part 17 Flow guide part 18,41 Nozzle shaft body

Claims (3)

In a liquid jet nozzle that jets liquid from a nozzle port,
A nozzle body formed so as to be connected to the nozzle opening and having a central hole through which liquid is pumped, and an orifice portion being formed in the middle hole in the liquid pumping direction;
A nozzle shaft body provided so as to extend from the inside of the nozzle body to the outside and pass through the orifice portion,
A narrow-diameter portion formed extending in the liquid pumping direction;
A flange portion provided at one end of the small diameter portion in the liquid pumping direction and formed to protrude in a direction perpendicular to the axis of the nozzle body ;
Continuous with one liquid pumping direction against the flange portion, and the air-guiding portion is formed to have a reduced closes frustoconical inclined or hemispherical curved surface towards the end,
A shaft base portion formed at the other end in the liquid pumping direction of the small diameter portion ,
A nozzle shaft body relative positions that provided variably in the liquid pumping direction with respect to the orifice portion,
A nozzle body holding portion that is formed with a holding hole that penetrates in the liquid pumping direction and has an inner dimension that decreases toward one side in the liquid pumping direction, and the shaft base portion is disposed inside the holding hole. And a shaft body holding portion to which the nozzle body is mounted so as to be able to advance and retreat by the screwing . In the nozzle shaft body,
The nozzle for liquid injection according to claim 1 , wherein a frustoconical inclined surface expanding toward the end portion is formed between the flange portion and the flow guide portion. The liquid ejecting nozzle according to claim 1, wherein the liquid ejected from the nozzle opening is a liquid having a viscosity equal to or higher than that of water and equal to or lower than that of the liquid containing the polymer.

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