JPH07100410A - Liquid jet nozzle - Google Patents

Abstract

PURPOSE:To suppress the fluctuations of the jet amt. of a liquid agent accompanied by the consumption of a sealed propellant by providing a liquid jet nozzle with a valve disc displaced to one side when the inner pressure of a container is applied to a diaphragm to cut off the communication of a high pressure passage and a spring means energizing the valve disc. CONSTITUTION:When a nozzle button 2 is pushed down, the liquid agent in a can is pushed out of the leading end of a discharge pipe 2 and ejected from the leading end of a valve disc 5 though a passage hole 15, a peripheral groove 10 and a high pressure passage 12. When the pressure of the liquid agent overcomes the sum of the elastic force of a conical coil spring 8 and atmospheric pressure at this time, a diaphragm 7 is deflected in the direction reducing the volume of a diaphragm chamber 6 and the valve disc 5 is moved to the right by the deflection of the diaphragm. The passing hole 15 is closed by the moved valve disc 5 to cut off the high pressure passage 12 to limit the ejection of the liquid agent. When the pressure of the liquid agent acting on the diaphragm is lowered, the valve disc 5 is pushed toward a jet orifice 13 along with the diaphragm 7 by the conical coil spring 8 and the passage hole 15 is again opened to keep jet pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid agent injection nozzle for injecting or spraying a liquid agent such as a paint or an insecticide, which is pressurized and sealed in a container.

[0002]

2. Description of the Related Art Paints, hair styling agents, insecticides, and other liquid agents are enclosed in a can together with a propellant for pressurization, and the pressure produced by the propellant is used to spray or spray the liquid agent in the can. The spray cans are popular. In such a spray can, a liquefied gas such as CFC or LPG has been conventionally used as a propellant for generating a jet pressure, but in recent years, a harmless propellant from the viewpoint of preventing environmental pollution. The momentum to substitute for is increasing.

[0003]

As a harmless propellant, it is ideal to use an inert gas such as nitrogen which is mixed in a large amount in the atmosphere. However, nitrogen is a normal spray. Since it is practically impossible to liquefy and seal in a can, it must be sealed in a compressed state.

However, unlike the relatively stable evaporation pressure generated by the liquefied gas such as Freon and LPG, the pressurization by the compressed nitrogen lowers the residual pressure as the liquid agent in the can is consumed, and thus the injection is performed. The conventional nozzle structure in which only the atomization of the liquid agent is taken into consideration is accompanied by the inconvenience that the injection amount decreases with the lapse of usage time. In addition, even if harmless liquefied gas is developed, it is difficult to secure stable atomization especially at low temperature because the current nozzle structure cannot cope with the change of evaporation pressure due to the change of temperature. Is.

In order to cope with such a problem, for example, a valve that moves in accordance with suspension of discharge pressure and spring force, as used in a hydraulic pressure generator as a power source of a hydraulically actuated actuator. It is also possible to apply a pressure reducing valve that opens and closes the discharge port by the body. However, such a pressure reducing valve needs to prevent back pressure from being applied to the surface of the valve body on the side opposite to the side on which the discharge pressure acts.
Since atmospheric pressure must be introduced into the same portion, it is necessary to seal between the side on which the hydraulic pressure acts and the side on which the atmospheric pressure acts. As this sealing material, O which is generally fitted on the valve body is used.
Rings and the like are used, but in the case of the flow rate and pressure used for household spraying as described above, the influence of the resistance of the sealing material on the movement of the valve body tends to be large, so it is particularly small and It is not always applicable to household sprays that are desired to be inexpensive.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to:
It is an object of the present invention to provide an improved liquid agent injection nozzle capable of suppressing a variation in the injection amount of a liquid agent due to consumption of a pressurized pressurizing agent and maintaining a stable injection pressure for a long period of time. A second object of the present invention is to provide a liquid agent injection nozzle having a pressure regulating valve body with a simple structure and low motion resistance.

[0007]

According to the present invention, such an object is to provide an injection port provided on a nozzle button by pressing down a liquid agent enclosed in a container together with a propellant for pressurization. A liquid agent injection nozzle used by being attached to a valve-equipped discharge port provided in the container for injecting from a diaphragm, a diaphragm, a low pressure passage for introducing atmospheric pressure to one surface of the diaphragm, and the discharge port. And a high pressure passage for communicating between the injection port and the other surface of the diaphragm for introducing the internal pressure in the container, and the internal pressure in the container coupled to the central portion of the diaphragm when the internal pressure in the container is applied to the diaphragm. A liquid agent injection nozzle, comprising: a valve body that is displaced to one side to cut off the communication of the high pressure passage; and a spring means that urges the valve body in a direction to communicate the high pressure passage. It is achieved by providing a Le.

[0008]

According to this structure, since the valve body is normally located at the position where the high pressure passage is opened by the urging force of the spring means,
When the nozzle button is pushed down in order to eject the liquid agent in the container from the ejection nozzle, the liquid agent flows out into the high pressure passage and is ejected from the ejection port, and a high pressure is exerted on the other surface of the diaphragm. Then, the diaphragm is displaced against the biasing force of the spring means, and the valve body is also displaced accordingly, and the high-pressure passage is closed. Then, when the high-pressure passage is closed, the pressure acting on the diaphragm decreases, so that the valve body is moved by the biasing force of the spring means and the high-pressure passage is opened again. Then, the high pressure acts on the other surface of the diaphragm again, and the diaphragm is displaced in the direction of closing the valve body. By repeating this cycle at high speed, the injection pressure of the liquid agent is limited to the predetermined pressure defined by the spring means. Also,
Since the hydraulic pressure side and the atmospheric pressure side are liquid-tightly separated by the diaphragm, it is not necessary to seal the valve body itself, and the sliding resistance of the valve body is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

1 and 2 are longitudinal sectional views showing a first embodiment of a spray nozzle constructed according to the present invention. This spray nozzle 1 is used by being attached to a discharge pipe 2 with a valve provided in a can (not shown) that stores a liquid agent together with a propellant for pressurization (such as compressed nitrogen).

In FIG. 1, a spray nozzle 1 includes a nozzle button 3 fitted on the tip of a discharge pipe 2 and a discharge pipe 2.
Of the valve body 4 formed on the central axis of the nozzle button 3 in a direction orthogonal to the axis of the nozzle button 3, and a diaphragm chamber 6 formed adjacent to the valve chamber 4 and having a diameter larger than that of the valve chamber 4. And a retainer 9 for holding the outer peripheral part of the diaphragm 7 in the diaphragm chamber 6 and a conical coil spring 8 for pressing the central part of the diaphragm 7 toward the valve chamber 4 side. Has become.

The valve body 5 is integrally connected to the surface of the diaphragm 7 on the valve chamber 4 side, and circumferential grooves 10 and 11 are formed in the connecting portion with the diaphragm 7 and the intermediate portion thereof. A passage hole 12 is provided on the central axis of the valve body 5 so as to connect the circumferential grooves 10 and 11 to the tip of the valve body 5.

The tip portion of the valve element 5 is tapered in a taper shape, and the tip is exposed to the injection port 13 opened at the end of the valve chamber 4 so as to communicate with the outside. In addition, a plurality of labyrinth grooves 14 are provided in the outer peripheral portion on the front end side of the valve body 5, so that the liquid agent is prevented from leaking from the gap between the valve chamber 4 and the valve body 5.

At the position of the nozzle button 3 which is aligned with the circumferential groove 10 on the center side of the valve body in the natural state, the tip of the discharge pipe 2 is received and the passage hole 1 into which the liquid agent flows is introduced.
5 are provided.

A through hole 16 is opened in the retainer 9 so that atmospheric pressure is introduced into the diaphragm chamber 6.

Each of the above-mentioned members is formed of a synthetic resin material, and the valve body 5 and the valve body 5 are arranged from the diaphragm chamber 6 side.
The diaphragm 7 integrally formed with the above is inserted, the conical coil spring 8 is attached, and the retainer 9 is press-fitted into the opening of the diaphragm chamber 6 to form an assembly.

Next, the operating procedure of the spray nozzle 1 according to the present invention will be described.

First, when no external force is applied, the valve body 5 together with the diaphragm 7 is fully pressed into the valve chamber 4 by the elastic force of the conical coil spring 8 (state of FIG. 1). When the nozzle button 3 is pushed down from this state, the discharge pipe 2 is pushed down and a valve (not shown) is opened, and the liquid agent in the can is pushed out from the tip of the discharge pipe 2 by the pressing force of the compressed nitrogen. The liquid agent is sprayed from the tip of the valve body 5 through a passage hole 15 provided in the nozzle button 3, a circumferential groove 10 at the center of the valve body 5, and a passage hole 12 provided at the center of the valve body 5. At the same time, the diaphragm chamber 6 is pushed out from the circumferential groove 11 at the connecting portion between the valve body 5 and the diaphragm 7.
Flows in between the bottom surface and the diaphragm 7. When the pressure of the liquid agent at this time overcomes the sum of the elastic force of the conical coil spring 8 and the atmospheric pressure, the diaphragm 7 bends toward the side where the volume of the diaphragm chamber 6 is reduced, and the valve body 5 is changed as shown in FIG. Move to the right at.

When the pressure of the liquid acting on the diaphragm 7 exceeds a predetermined value, the passage hole 15 provided in the nozzle button 3 is closed by the moved valve body 5, as shown in FIG. Here, since the injection of the liquid agent from the injection port 13 is continuing, when the passage hole 15 is closed, the pressure of the liquid agent acting on the diaphragm 7 decreases. Then, the pressing force to the left in FIG. 2 against the diaphragm 7, which is determined by the spring load of the conical coil spring 8 and the atmospheric pressure, becomes relatively high,
The valve body 5 is pushed out to the injection port 13 side together with the diaphragm 7, and the passage hole 15 is opened again. As a result, the liquid agent flows between the diaphragm 7 and the bottom surface of the diaphragm chamber 6,
The pressure causes the valve body 5 to move to the right again and enter the state shown in FIG.

By repeating the above operation at a frequency that is determined by the inertial resistance and frictional resistance of the valve body 5,
The liquid agent injection is continued under the condition that the discharge pressure is determined by the spring load of the conical coil spring 8.

3 and 4 show a second embodiment of the present invention, in which the valve open state corresponding to FIG. 1 is shown in FIG. 3, and the valve closed state corresponding to FIG. 2 is shown in FIG. . The same reference numerals are given to the parts corresponding to the first embodiment.

In this embodiment, the valve body 5 moves up and down on the same axis as the axis of the discharge pipe 2 so as to come into contact with and separate from the valve seat 22 formed in the fitting hole 21 of the discharge pipe 2. Is a poppet valve type that connects and disconnects the passage hole 23 from the discharge pipe 2 to the injection port 13, and the injection port 13 is opened to the atomizing nozzle member 24 provided at the outlet of the passage hole 23. Other than that, it has substantially the same operation as that of the first embodiment. Also in the case of the present embodiment, the state shown in FIG. 3 and the state shown in FIG. 4 are alternately repeated to limit the injection pressure of the liquid agent to a constant value.

[0023]

As described above, according to the present invention, the discharge pressure from the nozzle is limited, and the variation in the injection amount of the liquid agent due to the consumption of the pressurizing propellant enclosed in the can is suppressed. It is possible to achieve a great effect in eliminating the conventional inconvenience that the injection amount decreases with the passage of. In addition to this, since it is possible to eliminate the influence of the resistance of the sealing material on the movement of the valve body, it is possible to provide a small-sized and inexpensive spray nozzle having excellent operation stability.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a valve opening state of a first embodiment of a spray nozzle according to the present invention.

FIG. 2 is a vertical sectional view showing a valve closed state of the first embodiment of the spray nozzle according to the present invention.

FIG. 3 is a vertical cross-sectional view showing a valve open state of a second embodiment of the spray nozzle according to the present invention.

FIG. 4 is a vertical sectional view showing a valve closed state of a second embodiment of the spray nozzle according to the present invention.

[Explanation of symbols]

 1 Spray Nozzle 2 Discharge Pipe 3 Nozzle Button 4 Valve Chamber 5 Valve Body 6 Diaphragm Chamber 7 Diaphragm 8 Conical Coil Spring 9 Retainer 10/11 Circumferential Groove 12 Passage Hole 13 Injection Port 14 Labyrinth Groove 15 Passage Hole 16 Through Hole 21 Fit Hole 22 Valve seat 23 Passage hole 24 Nozzle member

Claims (1)

[Claims] 1. A discharge port with a valve provided in the container so that the liquid agent enclosed in a container together with a propellant for pressurization is ejected from an injection port provided in the nozzle button by pushing down the nozzle button. And a low-pressure passage for introducing atmospheric pressure to one surface of the diaphragm, and a communication port between the discharge port and the injection port and the other of the diaphragms. A high-pressure passage for introducing internal pressure in the container to the surface, a valve body coupled to the central portion of the diaphragm and displaced to one side when the internal pressure in the container is applied to the diaphragm, and disconnecting the communication of the high-pressure passage, And a spring means for urging the valve body in a direction in which the high-pressure passage communicates.