JPH10128180A - Trigger type liquid jetting instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To jet a liquid of sufficient amount, improve the liquid draining before and after the jetting, and prevent the liquid sagging by forming a jet valve on a nozzle section and jetting the pressurized liquid out of the jet valve. SOLUTION: A nozzle fitting cylinder 21 is fitted on the front end and a nozzle 41 is fitted on the front of the cylinder section 21 respectively on a liquid jet cylinder 15, and a front blocking cylinder 63 is protruded out of a cylindrical piston 62 fitted into a cylinder 26 between the cylinder of the nozzle fitting cylinder section 21 and a nozzle inner cylinder section 44, and a valve 61 with its front cylinder section fitted into a large inner diameter section of the inner cylinder section is disposed, and the valve 61 is urged forward, and a nozzle front end section 16 is brought into contact with a valve seat 45 to form a jet valve 71, and the valve 61 is moved back in resistance to urging by drawing a trigger to generate the high pressure in the nozzle fitting cylinder section 21 and open the jetting valve 71.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a trigger type liquid ejector.

[0002]

2. Description of the Related Art Many trigger-type liquid ejectors are conventionally known. Usually, when the plunger retreats against the bias in the cylinder due to the pulling of the trigger, as in JP-A-8-131912, the suction valve closes, the pressure in the cylinder increases, the discharge valve opens, and the injection cylinder is opened. Since the liquid is ejected in the form of fog or foam from the nozzle fitted to the front end via the nozzle fitting cylinder, and when the trigger is released, the plunger moves forward and the discharge valve is closed at this time. ,
The inside of the cylinder is provided with a negative pressure so that the suction valve is opened by the negative pressure and the liquid in the container fitted with the liquid ejector is sucked into the cylinder through the suction valve.

[0003]

In the trigger type liquid ejector as described above, the discharge valve is provided downstream of the cylinder, for example, near the base end opening of the injection cylinder.
At the beginning of the trigger operation, the discharge valve opens with insufficient discharge pressure, causing insufficient liquid ejection.At the end, the pressure of the residual liquid downstream immediately drops even after the discharge valve closes. As a result, there is a problem in that the liquid runs out poorly and liquid dripping occurs. Therefore, the position and operation of the discharge valve are
It has been an important task to keep the amount of ejected liquid constantly at a predetermined level or more, to improve the drainage of liquid, and to prevent dripping.

In recent years, it has been necessary to separate and discard metals and synthetic resin materials or elastomers in order to recycle resources, and this is considerably troublesome for consumers. In doing so, it is desired that the discharge valve be formed of a synthetic resin material like other members.

The object of the trigger type liquid ejector according to the present invention is to improve the discharge valve so that the amount of ejected liquid is always kept at a predetermined level or more, and furthermore, the drainage is improved and the dripping can be prevented. It is to make.

An object of the trigger type liquid ejector according to the second and third aspects is to enable the discharge valve to be made of a synthetic resin material or an elastomer together with the above object.

[0007]

As a first means, a trigger type liquid ejector in which a nozzle fitting tube 21 is fitted to a front end of a liquid injection tube 15 and a nozzle 41 is fitted to the front portion of the tube, respectively. In the nozzle fitting cylinder 21, the connecting cylinder 23 projecting rearward from the substrate 22 is fitted to the outer surface of the front end of the injection cylinder 15 in a water-tight manner, and is eccentric with respect to the coupling cylinder so that the front surface of the substrate 22 From the front, the fitting cylinder 24 having a larger outer diameter than the connecting cylinder 23 and the cylinder 26 having a smaller diameter and a shorter diameter than the fitting cylinder 24 with a small gap 25 therebetween. The small gap is provided at a part of the substrate portion between the fitting tube portion 24 and the cylinder 26
A liquid outflow hole 27 that communicates 25 with the injection cylinder 15 and an air inflow / outflow hole 28 that opens in the other part of the substrate from the inside of the cylinder to the outside of the connection cylinder part 23 are formed. And nozzle
41, the fitting cylinder 43 from the front wall 42, and the inner cylinder part 44 having a smaller inner diameter than the cylinder 26 from the center of the front wall, respectively, project rearward, and the fitting cylinder 43 is watertight to the fitting cylinder part 24. Along with fitting
The inner cylindrical portion 44 is formed by forming a nozzle hole 48 in a front wall portion surrounded by the inner cylindrical portion 44 through a rearward stepped valve seat 45 with a larger diameter at a rear portion 47 than a front end portion 46. And the above cylinder 26
A valve in which a front closing cylinder 63 protrudes forward from a cylindrical piston 62 fitted into the cylinder, and a front cylindrical part is fitted into a large inner diameter part of the inner cylindrical part, between the inner cylindrical part 44 and the inner cylindrical part 44. A body 61 is provided, and the valve body is urged forward so that the outer periphery of the front end of the front closing cylinder 63 is moved to the valve seat.
The discharge valve 71 is formed by being pressed against the valve 45, and the valve body 61 retreats against the urging force due to the high pressure in the valve chamber formed by the nozzle fitting cylinder 21 and the nozzle 41 due to the pulling of the trigger. Was formed to be openable.

As a second means, in the trigger type liquid ejector of the first means, the guide rod 32 projects forward from the central portion of the substrate portion surrounded by the cylinder 26 and guides the guide rod 32 to the outer surface of the guide rod 32. The rear part of the elastic compression cylinder 82, which is longer than the rod 32 and is provided so as to be elastically compressible, is fitted, and the front part of the elastic compression cylinder 82 is fitted into the valve body 61, so that the elastic compression cylinder 82
Urged the valve body 61 forward.

As a third means, in the trigger type liquid ejector according to the first means, the front inner peripheral surface of the front closing cylinder 63 of the valve body 61 is formed on the front small diameter tapered wall surface 68 and the cylinder is formed. From the central portion of the substrate portion surrounded by 26, a plurality of split grooves 33 are vertically provided at substantially equal intervals, and a cylinder 35 having a leaf spring-like portion 34 in each cylindrical wall portion between the split grooves is projected forward, and each The front end of the leaf spring-like portion was brought into contact with the rear inner wall surface of the tapered wall surface 64, and the valve body 61 was urged forward by the plurality of leaf spring-like portions.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the basic structure of a trigger type liquid ejector will be briefly described with reference to FIG.
A mounting cylinder that fits into the mouth and neck of the container body that contains the liquid,
The suction cylinder 13 stands upright through the rear part of the upper wall of the large-diameter cylinder part 12 provided with the mounting cylinder at the lower end, the cylinder 14 from the middle of the suction cylinder, and the injection cylinder 15 from the upper end, Each protrudes forward. From the front of the injection cylinder 15, a trigger 16 is pivotally attached to the upper end with a pin or the like and hangs down. A front end face of a plunger 18 fitted by being urged forward by a coil spring 17 or the like into the cylinder 14 is engaged with the upper rear surface of the trigger 16, and the plunger moves back and forth by pulling and releasing the trigger. It is possible. The suction valve opened by the negative pressure inside the cylinder when the plunger moved forward
The liquid is sucked into the cylinder through the cylinder 19, and the pressure inside the cylinder when the plunger is moved is increased.
Squirted from.

According to the present invention, the liquid is accumulated upstream of the discharge valve formed in the nozzle section 20, and the discharge valve is opened at a pressure equal to or higher than a predetermined pressure and closed when the pressure falls below the predetermined pressure. Thus, the present invention is characterized in that the liquid ejection amount is maintained at a predetermined level or more, the liquid drainage is improved, and liquid dripping is prevented. Hereinafter, the configuration of the nozzle unit 20 will be described in detail.

FIG. 2 is an enlarged view of a main part of the nozzle unit 20.
Is basically configured by fitting a nozzle fitting cylinder 21 to the front end of the liquid injection cylinder 15 and a nozzle 41 to the front of the cylinder.

The nozzle fitting cylinder 21 has a connecting cylinder 23 projecting rearward from the substrate 22 water-tightly fitted to the outer surface of the front end of the injection cylinder 15 and eccentric downward with respect to the connecting cylinder. From the front surface of the substrate 22, the fitting tube portion having a larger outer diameter than the connection tube portion 23.
24 and a small gap 25 between the fitting cylinder and the fitting cylinder.
A cylinder 26 having a smaller diameter and a shorter diameter than the cylinder 24 projects forward, and a liquid outflow hole 27 that communicates the small gap 25 and the injection cylinder 15 with a part of the substrate between the fitting cylinder 24 and the cylinder 26.
Also, in a part of the substrate portion surrounded by the cylinder 26, an air inlet / outlet hole 28 that is opened from the inside of the cylinder to the outer portion of the connecting cylinder portion 23
Each is formed by drilling.

The nozzle 41 has a fitting tube 43 from the front wall 42,
And an inner cylindrical portion 44 having a smaller inner diameter than the cylinder 26 from the center of the front wall.
Respectively, and the fitting cylinder 43 is fitted watertight to the inner surface of the fitting cylinder part 24, and the inner cylinder part 44 has a portion 47 rearward from the front end part 46 via a rearward stepped valve seat 45. Large internal diameter,
Further, a nozzle hole 48 is formed in a front wall portion surrounded by the inner cylindrical portion 44. The nozzle hole 48 is provided with a spray grooved nozzle hole 52 at the center of a small cap-shaped insert 51 inserted into the groove through an annular deep groove 50 provided in the center of a raised portion 49 on the front wall front surface. In communication with Although the illustrated example uses the nozzle holes 52 with spin grooves for spraying liquid, other nozzle holes such as those for straight spraying and for foaming may be used.

A large-diameter cylindrical portion 53 protrudes rearward from the peripheral edge of the front wall 42, and the inner surface ridge 54 is forcibly crossed and locked to the ridge 36 on the outer surface of the fitting tube portion 24 of the nozzle fitting tube 21. The nozzle 41 is fixed to the nozzle fitting cylinder 21. As shown in FIG. 1, near the front surface of the nozzle 41, a lid plate 55 has an upper end pivotally attached to the upper portion of the nozzle and hangs down to close the nozzle hole 48. By rotating the cover plate 55 obliquely forward, the nozzle hole 48 is opened and the liquid can be ejected.

Between the nozzle fitting cylinder 21 and the nozzle 41, a valve chamber is formed by the substrate 22, the fitting cylinder 24, the front wall 42 and the fitting cylinder 43, and the cylinder 26 and the inner cylinder 44 In the meantime, the front end outer surface is fitted into the cylinder 26 inner surface, and the front closed cylinder 63 is projected forward from the rear end of the cylindrical piston 62 whose diameter is reduced rearward from the front end, and the front cylinder outer surface of the cylinder is closed. A valve body 61 is provided in which the ridge 64 is fitted on the inner surface of the large-diameter portion 47 of the inner cylindrical portion 44. The valve element has a central portion of the substrate surrounded by the cylinder 26 of the nozzle fitting cylinder 21 as a forward raised portion 31, a rear end on the front surface of the raised portion, and a front end on the rear surface of the front plate 65 of the front closed tube 63. Each is abutted, and is biased forward by a coil spring 81 loosely fitted to a guide rod 32 protruding forward from the center of the raised portion 31, and a tapered portion 66 formed by cutting off the front end outer surface of the front closing cylinder 46 to the valve seat 45. The discharge valve 71 is formed by pressure contact, and when the pressure in the nozzle fitting cylinder 21 is increased by the pulling of the trigger, the front closing cylinder 63, which is the valve body, retreats against the bias and the discharge valve 71 can be opened. Is formed.
In addition, a ridge 56 is provided on the inner surface of the rear end of the nozzle inner cylinder portion 44,
The front closing cylinder 63 plays the role of a stopper when moving backward.
A plurality of lateral grooves 57 and 67 are formed at predetermined intervals in the circumferential direction on the ridge 56 and the ridge 64 of the front closing cylinder, respectively, and serve as a liquid passage.

In the illustrated example, the forward biasing of the valve body 61 is performed by a metal coil spring 81, but it may be performed by an elastic member made of synthetic resin.

That is, as shown in FIG. 3, the outer surface of the guide rod 32 protruding forward from the substrate 22 is longer than the guide rod 32 and can be elastically compressed by a synthetic resin material, an elastomer, or a foam member thereof. The rear part of the elastic compression cylinder 82 provided is fitted, and the front part of the compression cylinder 82 is fitted into the valve body 61 with the front end face of the elastic compression cylinder 82 abutting on the rear surface of the front plate 65 of the front closing cylinder 63. The elastic compression cylinder 82 can also bias the valve body 61 forward.

Alternatively, as shown in FIG.
The inner peripheral surface of the front portion is formed on the tapered wall surface 68 having a small diameter at the front portion, and a plurality of split grooves 33 are vertically provided at substantially equal intervals from the center of the substrate portion surrounded by the cylinder 26 so that each cylinder between the split grooves is formed. The wall part,
A cylinder 35 is formed as a plate spring-shaped portion 34 made of a synthetic resin material or an elastomer integrally with the nozzle fitting cylinder 21 to protrude forward, and the front end of each plate spring-shaped portion is brought into contact with the rear inner wall surface of the tapered wall surface 68, The valve body 61 can be urged forward by the plurality of leaf spring-shaped portions. When the pressure of the liquid in the nozzle fitting cylinder 21 becomes high and urges the cylindrical piston 62 backward, as shown in FIG. 5, as the tapered wall surface 66 retreats, the leaf spring-like portion gradually deforms from the front end. Thus, the valve 61 can be moved backward.

When the above-described elastic member made of a synthetic resin is used, the coil spring 17 is also formed by, for example, a meandering leaf spring disclosed in Japanese Patent Application No. 8-207796 by the same applicant as the present application. Such as a cylindrical elastic member or a bellows-shaped cylinder using
As the elastic member made of synthetic resin or elastomer, all the constituent members of the trigger type liquid ejector can be made of synthetic resin or elastomer.

With the trigger pulling operation, from the cylinder 14,
The liquid supplied into the nozzle fitting cylinder 21 through the injection cylinder 15, the liquid outlet hole 27 and the small gap 25 is pressurized, and the coil spring 81
When the urging force of the valve body 61 exceeds the force exerted on the valve body 61, the valve body retreats, the discharge valve 71 opens, and the liquid flows through the nozzle hole.
Spout from 52. When the liquid pressure in the nozzle fitting cylinder 21 decreases due to the ejection of the liquid and falls below the urging force of the coil spring 81 or the like, the valve body 61 moves forward and the discharge valve 71 is closed. Further, at this time, since air flows in and out of the rear portion of the cylinder 26 whose volume is changed by sliding the valve body 61, through the air inlet / outlet hole 28, the cylindrical piston 62 can slide smoothly.

[0022]

According to the present invention, the trigger type liquid ejector according to the first aspect of the present invention has the valve body 61 provided on the valve seat 45 on the inner surface of the nozzle inner cylinder as described in the first aspect. By pressing the front end outer circumference of the front closed cylinder 63 to form a discharge valve 71, the discharge valve is opened when the hydraulic pressure exceeds the forward biasing force of the valve body 61 by the spring 81 or the like due to the high pressure in the valve chamber. Since the liquid is ejected, the ejection pressure is reduced by the ejection, and the ejection valve is provided so as to close when the pressure falls below the forward biasing force of the valve body 61,
The speed and volume of the ejected liquid are always kept above a predetermined level,
Further, as described above, since the opening and closing of the discharge valve is performed by the on / off operation with the urging force of the valve as a threshold value, the liquid is sufficiently drained and dripping can be prevented.

Further, in addition to the effects of the first aspect, the trigger type liquid ejector according to the second and third aspects has an elastic compression cylinder 82 as a means for urging the valve body 61 forward.
Alternatively, since the discharge valve can be made of a synthetic resin material or an elastomer by using a cylinder 35 formed of the split groove 33 and the leaf spring-like portion 34, all the components of the trigger type liquid ejector are made of a synthetic resin material. Alternatively, it can be made of an elastomer, so that there is no need to separate and discard it from metals, which is advantageous from the viewpoint of resource reuse.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a trigger type liquid ejector according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a nozzle portion of the ejector of FIG. 1;

FIG. 3 is a sectional view showing a modification of the elastic member 81 of the ejector of FIG. 1;

FIG. 4 is a sectional view showing a modification of the elastic member 81 of the ejector of FIG. 1;

FIG. 5 is an explanatory view showing a state in which a discharge valve 51 of the ejector is opened.

[Explanation of symbols]

11… Mounting cylinder 13… Suction cylinder 14
... Cylinder 15 ... Injection cylinder 16 ... Trigger 17
… Piston 18… Suction valve 20… Nozzle 21
… Nozzle fitting tube 22… Substrate 23… Connection tube part 24
… Mating tube part 25… Small gap 26… Cylinder 27
… Liquid outflow hole 28… Air inlet / outlet hole 31… Protrusion 32
… Guide rod 33… Split groove 34… Leaf spring part 35
... Cylinder 41 ... Nozzle 42 ... Front wall 43
… Fitting cylinder 44… inner cylinder part 45… valve seat 46
… Front end 47… Rear part 48… Nozzle hole 61
… Valve body 62… Cylinder piston 63… Front closure cylinder 66
… Tapered wall surface 71… discharge valve 81… coil spring 82
... Elastic compression cylinder

Claims (3)

[Claims] 1. A nozzle fitting cylinder 21 is provided at the front end of a liquid injection cylinder 15.
In the trigger type liquid ejector in which a nozzle 41 is fitted to the front part of the cylinder, the nozzle fitting cylinder 21 has a connecting cylinder part 23 projecting rearward from the substrate 22 at a front end of the injection cylinder 15. A watertight fitting to the outer surface of the connecting portion, and a fitting tubular portion 24 having a larger outer diameter than the connecting tubular portion 23 from the front surface of the substrate 22 eccentrically with respect to the connecting tubular portion, and between the fitting tubular portion. A cylinder 26 having a smaller diameter and a shorter diameter than the fitting cylinder portion 24 is protruded forward with a small gap 25 therebetween, and the small gap 25 is injected into a part of the substrate between the fitting cylinder portion 24 and the cylinder 26. Tube
And a liquid outflow hole 27 communicating with the nozzle 15 and an air inlet / outlet hole 28 opened in the other part of the substrate from the inside of the cylinder to the outer part of the connecting cylinder part 23. 41, the fitting cylinder 43 from the front wall 42, and the inner cylinder part 44 having a smaller inner diameter than the cylinder 26 from the center of the front wall, respectively, project rearward, and the fitting cylinder 43 is watertight to the fitting cylinder part 24. At the same time, the inner cylindrical portion 44 is connected to the front end portion through a rearward stepped valve seat 45.
A rear portion 47 has a larger inner diameter than 46, and a nozzle hole 48 is formed in a front wall portion surrounded by the inner cylinder portion 44, and a cylinder is further provided between the cylinder 26 and the inner cylinder portion 44. A front-side closing cylinder 63 is projected forward from a cylindrical piston 62 fitted therein, and a valve body 61 having a front cylindrical portion fitted into the large-diameter portion of the inner cylindrical portion is provided, and the valve body is biased forward. The outer periphery of the front end of the front closing cylinder 63 is pressed against the valve seat 45 to form the discharge valve 71, and the valve body 61 formed by the high pressure in the valve chamber formed by the nozzle fitting cylinder 21 and the nozzle 41 due to the trigger pulling. A trigger type liquid ejector characterized in that the discharge valve 71 is opened so as to retreat against the bias. 2. A guide rod 32 projects forward from a central portion of a substrate portion surrounded by a cylinder 26. An elastic compression cylinder 82 is provided on an outer surface of the guide rod 32 so as to be longer than the guide rod 32 and to be elastically compressible. The elastic compression cylinder (82) has a rear portion fitted therein, a front portion thereof is fitted into the valve body (61), and the elastic compression cylinder (82) biases the valve body (61) forward. Trigger type liquid ejector. 3. A front inner peripheral surface of a front closing cylinder 63 of a valve body 61,
Formed on the tapered wall surface 68 of the front small diameter, and the cylinder 26
From the center of the substrate area surrounded by
A cylinder 35 is vertically provided and each cylinder wall portion between the split grooves is a plate spring-shaped portion 34.A cylinder 35 is protruded forward, and a front end of each plate spring-shaped portion is brought into contact with a rear inner wall surface of the tapered wall surface 66, 2. The trigger type liquid ejector according to claim 1, wherein the valve body 61 is urged forward by the plurality of leaf spring portions.