JPH0824728A - High pressure liquid injection gun - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to effectively prevent the high-pressure water stream 54 from colliding with the target object and scattering to the surroundings, while omitting the installation of a hood or the like for preventing the dispersion of the high-pressure water injection gun 10 on the tip end. To prevent. [Structure] A low-pressure water injection port 28 that annularly surrounds a high-pressure water injection nozzle 24 that injects a high-pressure water flow 54 is provided, and a low-pressure water flow 56 injected from the low-pressure water injection port 28 surrounds the outside of the high-pressure water flow 54. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure liquid injection gun capable of preventing a high pressure liquid injection flow from being scattered around after collision.

[0002]

2. Description of the Related Art In a conventional high-pressure liquid jet gun, in order to prevent the high-pressure liquid jet flow from being scattered to the surroundings after collision, the high-pressure liquid jet flow is surrounded from the outside by a tip portion of a high-pressure liquid jet nozzle. A hood (Japanese Utility Model Laid-Open No. 62-39860) and an annular brush (Japanese Utility Model Laid-Open No. 60-151553) are attached.

On the other hand, in the fluid jet nozzle of Japanese Patent Publication No. 55-33667, the annular jet flow is discharged while being in contact with the surface of the central jet flow while being integrated with the central jet flow. Moreover, in Japanese Patent Publication No. 2-12151, in a nozzle of a high pressure flow and a low pressure flow switching type, at the time of low pressure flow injection,
An annular low pressure jet is injected so as to surround the central low pressure jet from the outside with a gap.

[0004]

When a hood or an annular brush is attached to the tip of the high-pressure liquid jet nozzle, the hood or the annular brush is contaminated, so it is necessary to clean it regularly or appropriately, and maintenance is complicated. In addition, if the high-pressure liquid injection gun becomes longer due to the hood and the annular brush, and the distance from the high-pressure liquid injection nozzle to the target object becomes longer, the tip of the hood and the annular brush will move away from the target object, and the high-pressure liquid injection flow will increase. It becomes impossible to prevent scattering after the collision. Of course, it may be difficult to guide the high-pressure liquid jet flow to the injection target, or the peeling ability of the high-pressure liquid jet flow, such as cleaning or painting, may decrease depending on the distance to the object.

In the fluid jet nozzle of Japanese Patent Publication No. 55-33667. Since the inner and outer jet flows are united with each other and collide with the object, both the inner and outer jet flows are scattered around.

In the nozzle of Japanese Patent Publication No. 2-12151, the annular jet flow from the outside is not jetted when the high pressure liquid jet flow is jetted from the central nozzle, and the low pressure liquid jet flow is jetted from the central nozzle. Is ejected, that is, the jet flow of the same pressure and low pressure is jetted from the center and the outside, and there is no function of preventing the high-pressure liquid jet flow after collision against the object from scattering.

An object of the present invention is to provide a high-pressure liquid injection gun capable of effectively preventing the high-pressure liquid injection flow from scattering while eliminating the harmful effects of mounting a hood for preventing the high-pressure liquid injection flow from scattering at the tip. Is to provide. A second object of the present invention is to provide a high-pressure liquid injection gun which can use a low-pressure liquid injection flow for scattering prevention as a high-temperature flow having a high cleaning effect while omitting a heating means such as a heater. The object of the invention of claim 3 is to utilize the jet structure of the low pressure liquid jet flow for scattering prevention as a measure for suppressing the impact of the on-off valve when the high pressure liquid jet flow is cut off, and when the jetting of the high pressure liquid jet flow is stopped. Is to provide a high-pressure liquid jet gun capable of jetting a high-temperature jet having a high cleaning effect.

[0008]

The present invention will be described using reference numerals in the drawings corresponding to the embodiments. The high pressure liquid injection gun (10) according to claim 1 has the following components (a) and (b). (A) High-pressure liquid injection nozzle (2) for injecting high-pressure liquid injection flow (54)
4,80) (b) An annular shape that encloses the high-pressure liquid injection nozzles (24,80) in an annular shape from the outside and a high-pressure liquid injection flow (54) that encloses the high-pressure liquid injection flow (54) in an annular shape from the outside. Jet (28,88)

A high pressure liquid injection gun (10) according to a second aspect is the high pressure liquid injection gun (10) according to the first aspect, further comprising a pressure regulating valve (6).
8) adjusts the liquid pressure to the high pressure liquid injection nozzle (24, 80) by adjusting the discharge amount to the residual liquid port (70), and the annular injection port (28, 88) is adjusted from the residual liquid port (70). The remaining liquid is supplied and jetted.

A high-pressure liquid injection gun (10) according to claim 3 is the high-pressure liquid injection gun (10) according to claim 1 or 2, wherein the high-pressure liquid injection nozzle (24, 80) and the annular injection port (28, 28) are manually operated. It has an on-off valve (40) that controls the connection with 88).

[0011]

In the high pressure liquid injection gun (10) of the first aspect, the high pressure liquid injection flow (54) is injected from the high pressure liquid injection nozzle (24, 80).
In parallel with this, the low pressure liquid jet (56) is
The high pressure liquid jet flow (54) is injected from the annular injection ports (28, 88) into an annular flow that surrounds the high pressure liquid injection flow (54) from the outside with a proper gap between the high pressure liquid injection flow (54). When the high-pressure liquid jet flow (54) collides with an object and is scattered, the scattered flow is the outer ring-shaped low-pressure liquid jet flow (5
Collision with 6), the scattering force is reduced, and scattering is prevented or suppressed.

In the high-pressure liquid injection gun (10) of the second aspect, the residual liquid is at a high temperature due to rapid compression in the pump (64) and friction in the pressure regulator. This high temperature residual liquid is guided toward the annular injection port (28, 88) and is ejected from the annular injection port (28, 88) as a low pressure liquid injection flow (56). Thus, the low-pressure liquid jet flow (56) from the annular jet ports (28, 88) becomes sufficiently high in temperature to hit the object and effectively remove dirt.

In the high pressure liquid injection gun (10) of the third aspect, when the on-off valve (40) is opened, the liquid pressure-fed to the high pressure liquid injection nozzle (24, 80) is annular injection port (28, 88). ),
High-pressure liquid jet flow (54) from the high-pressure liquid jet nozzle (24, 80) injected as a low-pressure liquid jet flow (56) from the annular jet port (28, 88)
Injection is stopped. High pressure liquid injection nozzle (24,80)
Like the residual liquid, the liquid that is pumped to is also hot due to the sudden pressurization of the pump (64).
The liquid mixed with the liquid and the residual liquid led out from (40) to the annular injection port (28, 88) is also sufficiently high temperature, and this high temperature mixed liquid is injected from the annular injection port (28, 88), Effectively removes dirt by hitting an object.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 2 is a side view of the high-pressure water jet gun 10 as a whole. The grip 14 projects rearward in the horizontal direction from the body 12 and is gripped by an operator. High pressure water hose
16 is connected to the upper part of the body 12, and the spill hose 18 is connected to the rear end of the grip 14. The grip 14 forms a conduit for guiding liquid from the spill hose 18 into the body 12. The lever 20 is connected to the lower part of the body 12 so that the operator can grip it.
While gripping the grip 14, the lever 20 can be swung to the grip 14 by the hand. The high pressure side lance 22 is
A high-pressure water jet nozzle 24 is attached to the front end portion so as to project forward from the body 12. The low pressure side lance 26 is a high pressure side lance.
22 and the high-pressure water jet nozzle 24 are annularly surrounded from the outside,
It reaches further in front of the high-pressure water jet nozzle 24, serves as a protector for the high-pressure side lance 22 and the high-pressure water jet nozzle 24, and has a circular, ie, annular, low-pressure water jet port 28 on its tip surface.

FIG. 1 is a detailed structural diagram of the high-pressure water jet gun 10. The high-pressure water hose 16 is attached to the upper end portion of the connecting fitting 30 screwed onto the upper portion of the body 12, and communicates with the high-pressure water passage 34 in the body 12. The spill hose 18 communicates with the low pressure water passage 36 formed below the high pressure water passage 34 in the body 12 via the grip 14. The front end of the low pressure water passage 36 is an annular groove 37, and the annular groove 37 is formed in an annular shape so as to surround the high pressure water passage 34 from the outside. The communication hole 38 connects the high-pressure water passage 34 and the low-pressure water passage 36 to each other, and the valve body 40 is arranged in the high-pressure water passage 34 so that the communication hole 38 can be opened and closed from the high-pressure water passage 34 side, and the valve rod 42 has a smaller diameter than the communication hole 38,
To the lower side of the body 12 through the communication hole 38 and the low pressure water passage 36. Compression coil spring 44
Is contracted between the protruding edge of the valve body 40 and the lower surface of the high-pressure water passage 34, and urges the valve body 40 in the opening direction. Seal 46
Is disposed in a portion of the lower wall of the body 12 through which the valve rod 42 penetrates, a seal retainer 48 is applied from the lower side to prevent the valve rod 42 from coming off, and seals against sliding of the valve rod 42. . The lever 20 is swingably connected to the body 12 at a fulcrum 49 at an intermediate portion, and has a long hole 50 in an arm portion on the valve rod 42 side. The connecting pin 52 is attached to the lower end of the valve rod 42 and has a long hole.
While being prevented from coming off from 50, it is movably inserted into the long hole 50. When the lever 20 is swung by an operator, the connecting pin 52 slides in the elongated hole 50, and the valve rod 42 moves up and down. The high-pressure water stream 54 and the low-pressure water stream 56 are adapted to be jetted from the high-pressure water jet nozzle 24 and the low-pressure water jet port 28, respectively.

FIG. 3 is a system diagram for supplying water 62 to the high-pressure water jet gun 10. The tank 60 stores water 62 and the super high pressure pump 64
Sucks the water 62 in the tank 60 through the suction hose 66,
Discharge at ultra high pressure. The pressure regulating valve 68 is connected to the discharge port of the ultra-high pressure pump 64, controls the connection between the discharge port of the ultra-high pressure pump 64 and the spill port 70, and adjusts the discharge pressure of the ultra-high pressure pump 64 to a desired value. The outlet of the ultra-high pressure pump 64 is connected to the high-pressure water hose 16 via the on-off valve 72, and the opening / closing of the on-off valve 72 controls the supply of the water 62 from the ultra-high pressure pump 64 to the high-pressure water injection gun 10. The switching valve 74 selectively connects the spillage port 70 of the pressure regulating valve 68 to the spillage hose 18 or the return hose 76. The spillage of the spillage port 70 still maintains an appropriate pressure, and the spillage of the spillage port 70 is returned to the high-pressure water injection gun 10 via the spillage hose 18 or returned according to the switching position of the switching valve 74. It is sent to the tank 60 via the hose 76.

The operation of the embodiment will be described. In the cleaning operation, the opening / closing valve 72 is opened, and the switching valve 74 is set to the switching position where the spillage port 70 of the pressure regulating valve 68 is connected to the spillage hose 18. The worker
If you pull the lever 20 of the high-pressure water jet gun 10 toward the grip 14,
The valve body 40 resists the urging force of the compression coil spring 44 and the communication hole 38.
Is closed, and the high-pressure water passage 34 and the low-pressure water passage 36 are brought into a non-communication state. The high-pressure water 62 from the ultra-high-pressure pump 64 flows into the high-pressure water passage 34 of the body 12 via the high-pressure water hose 16, and is jetted from the high-pressure water jet nozzle 24 as a linear high-pressure water stream 54 to the target object. On the other hand, the spillage from the spillage port 70 of the pressure regulating valve 68 flows into the low pressure water passage 36 of the body 12 via the spillage hose 18,
Further, the low pressure water flow 56 from the low pressure water injection port 28 through the annular groove 37.
And is jetted. The low-pressure water stream 56 reaches the object as an annular stream that surrounds the high-pressure water stream 54 from the outside with a proper gap to form a cylinder, that is, an annular shape. The high-pressure water stream 54 tries to scatter to the surroundings due to the collision with the target object, but the scattered high-pressure water stream 54 collides with the low-pressure water stream 56 to prevent the scattering force,
Or it is weakened and scattering is prevented or suppressed.

The spilled water discharged from the super high pressure pump 64 to the spill port 70 of the pressure regulating valve 68 is heated to a high temperature (for example, due to rapid compression in the super high pressure pump 64 and friction in the pressure regulating valve 68).
At a pump pressure of 1500 kgf / square cm and a water supply rate of 26 liters / minute, the temperature of the water 62 discharged from the ultra-high pressure pump 64 rises by about 40 ° C or more with respect to room temperature water. ), And the sewage whose temperature has risen becomes the low pressure water flow 56, so the low pressure water flow 56 is
It hits the target object at a sufficiently high temperature and cleans the part at high temperature to effectively remove dirt.

To stop the injection of the high-pressure water stream 54, the operator releases the lever 20. As a result, the valve body 40 separates from the communication hole 38 according to the biasing force of the compression coil spring 44, and the communication hole 38
When opened, the high pressure water passage 34 and the low pressure water passage 36 are in communication with each other. The high-pressure water 62 in the high-pressure water passage 34 passes through the communication hole 38.
To the low pressure water passage 36, the pressure is sufficiently reduced, mixed with the residual water from the residual water hose 18, and is injected from the low pressure water injection port 28 by the annular low pressure water flow 56. On the other hand, high pressure water injection nozzle 24
Although a small amount of water 62 is jetted from the tank, the liquid pressure is sufficiently reduced, and the jet of the high-pressure water stream 54 disappears. In this way, the high-pressure water injection gun 10 is switched from the high-pressure injection to the low-pressure injection, and the rapid decrease in the injection amount in the high-pressure water injection gun 10 is suppressed, so that in the flow system of the high-pressure water 62 due to the shock at the time of switching. Damage to each part is prevented.

The water 62 in the high-pressure water passage 34 has a high temperature equal to that of the spillage port 70 of the pressure regulating valve 68 due to the rapid compression of the ultra-high pressure pump 64 and the pressure regulating valve 68.
Since 54 is thin, it will come into contact with the surrounding air at the same time as the jetting, or will be entrained as a mist and will drop in temperature rapidly, while the low-pressure water stream 56 has a sufficient cross-sectional area, so when the jetting of the high-pressure water stream 54 is stopped Then, the high-temperature water 62 from the high-pressure water hose 16 and the spillage hose 18 becomes a low-pressure water flow 56, and collides with the target object while keeping the high temperature. In this way, a large amount of low-pressure water stream 56 at high temperature is jetted to the object, effectively removing the dirt of the object.

FIG. 4 is a structural view of a modification of the high pressure water injection gun 10 of FIG. Only the differences will be described. The high-pressure water jet nozzle 80 is attached to the tip of the high-pressure side lance 22, and has a taper 82 on the outer circumference of the tip that gradually increases in diameter in the tip direction. The low pressure side lance 84 is the high pressure side lance 22 and the high pressure water injection nozzle.
To surround 80 from the outside, it extends coaxially with the high-pressure side lance 22, and the tip is tapered 86 with the diameter gradually increasing in the tip direction, and the edge of the tip opening is a taper 90 parallel to the taper 82. The taper 82 of the high-pressure water jet nozzle 80 is projected slightly ahead of the taper 90. The low-pressure water injection port 88 is defined by tapers 82 and 90 on the inner and outer peripheral sides, and has a circular shape, that is, an annular shape. The high-pressure water stream 54 is linearly jetted from the injection hole of the high-pressure water jet nozzle 80, whereas the low-pressure water stream 56 is jetted from the low-pressure water jet port 88 in a conical shape, that is, in a divergent annular shape. Even with this high-pressure water injection gun 10, low-pressure water flow 56
Surrounds the outside of the high-pressure water stream 54 in a ring shape, so that when the high-pressure water stream 54 collides with the target portion and scatters, the high-pressure water stream 54
In response, the high pressure water flow 54 is prevented from scattering or suppressed.

In the embodiment, the high-pressure water jet gun 10 is used, but the high-pressure liquid jet gun of the present invention may be adapted to jet a liquid other than water 62. Further, by operating the switching valve 74 to interrupt the water supply to the low-pressure water passage 36, the arrival area of the high-pressure liquid jet flow and, for example, the state of separation can be confirmed.

[0023]

According to the first aspect of the present invention, the high-pressure liquid jet flow from the high-pressure liquid jet nozzle is surrounded and jetted from the outside by the annular low-pressure liquid jet flow. If it is attempted to scatter, the scatter will be prevented and suppressed by hitting the low-pressure liquid jet flow. Therefore, it is possible to omit attaching a hood or the like to the tip of the high-pressure liquid injection gun to prevent scattering, and to save the trouble of cleaning the hood or the like on a regular basis. Even in a situation where the tip does not reach the vicinity of the object, it is possible to effectively prevent the high-pressure liquid jet flow from scattering.

According to the second aspect of the invention, since the high temperature residual liquid is jetted from the annular jet port, the jetting low pressure liquid jet flow is applied to the object at high temperature while omitting the heating means of the jet liquid. Therefore, dirt can be effectively removed.

According to the third aspect of the present invention, when the injection of the high-pressure liquid injection flow from the high-pressure liquid injection nozzle is stopped, the on-off valve is manually operated so that the high-pressure liquid sent under pressure to the high-pressure liquid injection nozzle is circular. Since it is directed to the jet port and discharged from the annular jet port, the annular jet port that jets the low pressure liquid jet flow for scattering prevention is released to suppress the impact when the jetting of the high pressure liquid jet flow is stopped. It can be used as an outlet, and a sufficient amount of low-pressure liquid jet stream can be jetted at high temperature to effectively remove stains on an object.

[Brief description of drawings]

FIG. 1 is a detailed structural diagram of a high-pressure water jet gun.

FIG. 2 is a side view of the entire high pressure water injection gun.

FIG. 3 is a water supply system diagram for a high-pressure water injection gun.

FIG. 4 is a structural diagram of a modified example of the high-pressure water jet gun in FIG.

[Explanation of symbols]

 10 High-pressure water injection gun (high-pressure liquid injection gun) 24,80 High-pressure water injection nozzle (high-pressure liquid injection nozzle) 28,88 Low-pressure water injection port (annular injection port) 40 Valve body (open / close valve) 54 High-pressure water flow (high-pressure liquid injection) Flow) 56 Low-pressure water flow (low-pressure liquid injection flow) 64 Ultra-high pressure pump (pump) 68 Pressure regulator 70 Spill port (spill port)

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 29, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

In the fluid jet nozzle of Japanese Patent Publication No. 55-33667. Since the inner and outer jet flows are integrated with each other, both of the inner and outer jet flows are scattered around when colliding with the object.

Claims (3)

[Claims] 1. A high-pressure liquid injection nozzle (24, 80) for injecting a high-pressure liquid injection flow (54), and (b) the high-pressure liquid injection nozzle (24, 80) surrounded by an annular shape from the outside. Liquid jet (54)
A high-pressure liquid injection gun characterized by having an annular injection port (28, 88) for injecting a low-pressure liquid injection flow (56) which surrounds the outer ring with a gap from the outside. 2. A pressure regulating valve (68) adjusts the liquid pressure to the high-pressure liquid injection nozzle (24, 80) by adjusting the discharge amount to the residual liquid port (70), and the annular injection port (28, The high-pressure liquid injection gun according to claim 1, wherein the liquid (88) is supplied with the residual liquid from the residual liquid port (70) to inject it. 3. The high pressure liquid injection nozzle (2
3. The high pressure liquid injection gun according to claim 1, further comprising an opening / closing valve (40) for controlling connection between the annular injection port (28, 88) and the annular injection port (28, 88).