JP3580966B2 - Trigger type liquid ejector - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a trigger type liquid ejector.
[0002]
[Prior art]
Many trigger-type liquid ejectors are conventionally known. Normally, 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 is closed, the pressure in the cylinder is increased, the discharge valve is opened, 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 advances and the discharge valve is closed at this time. The pressure in the cylinder is reduced to a negative pressure, and the suction pressure is opened so that the liquid in the container fitted with the liquid ejector is sucked into the cylinder through the suction valve.
[0003]
[Problems to be solved by the invention]
In the trigger type liquid ejector as described above, the discharge valve is provided downstream of the cylinder, for example, near the opening of the base end of the injection cylinder, but at the beginning of the trigger operation, the discharge is performed in a state where the discharge pressure is insufficient. Since the valve opens, the liquid ejection becomes insufficient, and in the final stage, even after the discharge valve is closed, the pressure of the residual liquid downstream does not drop immediately, so that the liquid runs out poorly and liquid dripping occurs. was there. Therefore, it has been an important issue to renew the position and operation of the discharge valve so as to always maintain the liquid ejection amount at a predetermined level or more, to improve the liquid drainage, and to prevent liquid dripping.
[0004]
Also, in recent years, it is necessary to separate and discard metals and synthetic resin materials or elastomers in order to reuse resources, and this becomes considerably troublesome for consumers. It is desired that the discharge valve be made of a synthetic resin material like other members.
[0005]
An 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 moreover, the drainage of the liquid is improved and dripping can be prevented. It is in.
[0006]
Another object of the trigger type liquid ejector according to the second and third aspects of the present invention is to enable the discharge valve to be made of a synthetic resin material or an elastomer.
[0007]
[Means for Solving the Problems]
As a first means, in a trigger type liquid ejector in which a nozzle fitting cylinder 21 is fitted to a front end of a liquid injection cylinder 15 and a nozzle 41 is fitted to the front of the cylinder,
The nozzle fitting tube 21 has a connection tube portion 23 projecting rearward from the substrate 22 watertightly fitted to the outer surface of the front end portion of the injection tube 15 and connected eccentrically to the connection tube portion from the front surface of the substrate 22. A fitting tube portion 24 having a larger outer diameter than the tube portion 23 and a cylinder 26 having a smaller diameter and a shorter diameter than the fitting tube portion 24 are provided to project forward with a small gap 25 between the fitting tube portion. A liquid outflow hole 27 communicating the small gap 25 and the injection cylinder 15 is connected to a part of the substrate between the fitting cylinder part 24 and the cylinder 26, and is connected to another part of the substrate from inside the cylinder. Air inlet / outlet holes 28 opening to the outer portion of the cylindrical portion 23 are respectively formed by drilling,
The nozzle 41 projects rearward from the front wall 42 through the fitting tube 43 and from the center of the front wall an inner cylinder portion 44 having a smaller inside diameter than the cylinder 26, and the fitting tube 43 is inserted into the fitting tube portion 24. The inner cylindrical portion 44 has a rear portion 47 with a larger inside diameter than the front end portion 46 through a rearwardly stepped valve seat 45 and a nozzle hole 48 is formed in a front wall portion surrounded by the inner cylindrical portion 44. Further, between the cylinder 26 and the inner cylindrical portion 44, a front closing cylinder 63 is projected forward from a cylindrical piston 62 fitted into the cylinder, and the front cylindrical portion is A valve body 61 fitted into the large inner diameter portion of the cylindrical portion is provided,
The valve body is urged forward to press the outer periphery of the front end of the front closing cylinder 63 against the valve seat 45 to form the discharge valve 71,
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, the valve body 61 is retracted against the bias and the discharge valve 71 is opened.
[0008]
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 at the outer surface of the guide rod 32, The rear part of the elastic compression cylinder 82 provided to be long and elastically compressible is fitted, the front part of the elastic compression cylinder 82 is fitted into the valve body 61, and the valve body 61 is Biased forward.
[0009]
As a third means, in the trigger type liquid ejector of the first means, the front inner peripheral surface of the front closing cylinder 63 of the valve body 61 is formed on the tapered wall surface 68 of the front small diameter, and the cylinder 26 surrounds it. A plurality of split grooves 33 are vertically provided at substantially equal intervals from the center of the substrate portion, and a cylinder 35 having a cylindrical wall portion between the split grooves as a leaf spring-like portion 34 is protruded forward to form each leaf spring-like portion. The front end 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-shaped portions.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
First, the basic structure of a trigger type liquid ejector will be briefly described with reference to FIG. 1. Reference numeral 11 denotes a mounting cylinder which is fitted to the mouth and neck of a container body storing a liquid. The suction cylinder 13 stands upright through the rear part of the upper wall of the large-diameter cylindrical part 12 attached to the cylinder, and the cylinder 14 projects from the middle part of the suction cylinder and the injection cylinder 15 projects forward from the upper end. . From the front of the injection cylinder 15, a trigger 16 is pivotally attached at its upper end with a pin or the like and hangs down. A front end face of a plunger 18 fitted by being urged forward into the cylinder 14 by a coil spring 17 or the like is engaged with the upper rear surface of the trigger 16, and the pulling and releasing operation of the trigger causes the plunger to move back and forth. It is possible. The liquid in the container is sucked into the cylinder through the opened suction valve 19 by the negative pressure in the cylinder at the time of the plunger pre-movement, and is drawn through the injection cylinder 15 by the high pressure in the cylinder at the time of the plunger post-movement. It is ejected from the nozzle unit 20.
[0011]
The present invention accumulates the liquid upstream of the discharge valve formed in the nozzle portion 20, opens the discharge valve at a predetermined pressure or more, and closes the valve when the pressure falls below the predetermined pressure. It is characterized in that the amount of ejected liquid is kept at a predetermined level or more, the liquid is easily drained, and dripping is prevented. Hereinafter, the configuration of the nozzle unit 20 will be described in detail.
[0012]
The nozzle part 20 whose main part is shown in an enlarged scale in FIG. 2 has a basic configuration in which a nozzle fitting cylinder 21 is fitted to the front end of the liquid injection cylinder 15 and a nozzle 41 is fitted to the front part of the cylinder. Is configured.
[0013]
The nozzle fitting tube 21 water-tightly fits the connecting tube portion 23 projecting rearward from the substrate 22 to the outer surface of the front end portion of the injection tube 15, and is eccentric to the lower side with respect to the connecting tube portion. From the front face 22, a fitting cylinder part 24 having a larger outer diameter than the connecting cylinder part 23, and a cylinder 26 having a smaller diameter and a shorter diameter than the fitting cylinder part 24 with a small gap 25 between the fitting cylinder part 24. A liquid outlet hole 27 communicating with the small gap 25 and the injection cylinder 15 is provided in a part of the substrate between the fitting cylinder 24 and the cylinder 26, and a liquid discharge hole 27 is formed in a part of the substrate surrounded by the cylinder 26. An air inlet / outlet 28 is formed in a part of the cylinder to open from the inside of the cylinder to the outside of the connecting cylinder 23.
[0014]
The nozzle 41 projects rearward from the fitting wall 43 from the front wall 42 and the inner cylinder portion 44 having a smaller inner diameter than the cylinder 26 from the center of the front wall. The inner cylindrical portion 44 has a rear portion 47 with a larger inside diameter than the front end portion 46 through a rearwardly facing stepped valve seat 45, and the inner cylindrical portion 44 has a nozzle formed on a front wall portion surrounded by the inner cylindrical portion 44. The hole 48 is formed by drilling. The nozzle hole 48 is formed through an annular deep groove 50 provided in the center of the raised portion 49 on the front surface of the front wall, and a nozzle hole 52 having a spin groove for spraying at the center of the small cap-shaped insert 51 inserted into the groove. 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.
[0015]
The 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. Is fixed to the nozzle fitting cylinder 21. Further, as shown in FIG. 1, in the vicinity of 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 lid plate 55 obliquely forward, the nozzle hole 48 is opened, and the liquid can be ejected.
[0016]
A valve chamber is formed between the nozzle fitting cylinder 21 and the nozzle 41 by the substrate 22 and the fitting cylinder 24 and the front wall 42 and the fitting cylinder 43, and between the cylinder 26 and the inner cylinder 44. The outer surface of the front end is fitted to the inner surface of the cylinder 26, 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. Is provided on the inner surface of the large-diameter portion 47 of the inner cylindrical portion 44. The valve body 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 a rear surface of the front plate 65 of the front closed tube 63. The tapered portion 66 formed by cutting out the outer surface of the front end of the front closing cylinder 46 is biased forward by the coil spring 81 loosely fitted to the guide rod 32 projecting forward from the center of the raised portion 31 to the valve seat 45. The discharge valve 71 is formed by pressure contact, and when the pressure in the nozzle fitting tube 21 is increased by the pulling of the trigger, the front closing tube 63 as the valve body is retracted 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 to serve as a stopper when the front closed cylinder 63 moves backward. A plurality of lateral grooves 57, 67 are formed at predetermined intervals in the circumferential direction on the ridge 56 and the ridge 64 of the front closed cylinder, respectively, and serve as a liquid passage.
[0017]
In the illustrated example, the front urging of the valve body 61 is performed by the metal coil spring 81, but it may be performed by an elastic member made of synthetic resin.
[0018]
That is, as shown in FIG. 3, an elastic member provided on the outer surface of the guide rod 32 projecting forward from the substrate 22 so as to be longer than the guide rod 32 and to be elastically compressible with a synthetic resin material, an elastomer, or a foam member thereof. The front part of the compression cylinder 82 is fitted in the valve body 61 with the front end face of the elastic compression cylinder 82 abutting the rear face of the front plate 65 of the front closing cylinder 63, The valve body 61 can be urged forward by the elastic compression cylinder 82.
[0019]
Alternatively, as shown in FIG. 4, the front inner peripheral surface of the front closing cylinder 63 is formed on a tapered wall surface 68 having a small diameter at the front, and a plurality of splits are formed at substantially equal intervals from the center of the substrate portion surrounded by the cylinder 26. Grooves 33 are vertically provided, and cylinder walls 35 between the split grooves are made into a plate spring-like portion 34 made of a synthetic resin material or an elastomer integrally with the nozzle fitting tube 21 so as to protrude forward. The front end of the spring-shaped portion may be brought into contact with the rear inner wall surface of the tapered wall surface 68, and the valve body 61 may be biased 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 rearward, 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.
[0020]
When an elastic member made of a synthetic resin as described above is used, the meandering leaf spring disclosed in Japanese Patent Application No. 8-207796 by the same applicant as the present application is also used as the coil spring 17. As the elastic member made of a synthetic resin or an elastomer, such as a cylindrical elastic member or a bellows-shaped cylindrical body, all the constituent members of the trigger type liquid ejector can be made of a synthetic resin or an elastomer.
[0021]
By the trigger pulling operation, the pressure of the liquid supplied from the cylinder 14 into the nozzle fitting cylinder 21 through the injection cylinder 15, the liquid outflow hole 27 and the small gap 25 is increased, and the liquid is applied to the valve body 61 by the coil spring 81 or the like. When the force exceeds the force, the valve body retreats, the discharge valve 71 opens, and the liquid is ejected from the nozzle hole 52. When the liquid pressure in the nozzle fitting cylinder 21 decreases due to the liquid ejection 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. 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]
【The invention's effect】
According to the present invention, the trigger type liquid ejector according to the first aspect has the valve seat 45 on the inner surface of the nozzle inner cylinder portion and the front end of the front closing cylinder 63 of the valve body 61 as described in the first aspect. By pressing the outer periphery, a discharge valve 71 is formed, and when the liquid pressure exceeds the forward biasing force of the valve body 61 by the spring 81 or the like due to the increase in the pressure in the valve chamber, the discharge valve opens to eject liquid, Since the discharge pressure is reduced by the ejection and the discharge valve is closed when the pressure drops below the forward biasing force of the valve body 61, the speed and the amount of the ejected liquid are always kept at a predetermined level or more, and As described above, since the opening and closing of the discharge valve is performed by the ON and OFF operations using the urging force of the valve as a threshold value, the liquid runs out well and dripping can be prevented.
[0023]
In addition to the effects of the first aspect of the present invention, the trigger type liquid ejector according to the second and third aspects has an elastic compression cylinder 82 or a split groove 33 as a front urging means for the valve body 61 and a leaf spring. Since the discharge valve can be made of a synthetic resin material or an elastomer by using the cylinder 35 constituted by the shape portion 34, all the components of the trigger type liquid ejector can be made of a synthetic resin material or an elastomer. As a result, there is no need to separate and discard 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 of the present invention.
FIG. 2 is an enlarged sectional view of a main part of a nozzle portion of the ejector of FIG.
FIG. 3 is a cross-sectional view showing a modification of the elastic member 81 of the ejector of FIG.
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]
Reference Signs List 11 mounting cylinder 13 suction cylinder 14 cylinder 15 injection cylinder 16 trigger 17 piston 18 suction valve 20 nozzle part 21 nozzle fitting cylinder 22 substrate 23 connecting cylinder part 24 fitting cylinder part 25 ... Small gap 26 ... Cylinder 27 ... Liquid outflow hole 28 ... Air outlet hole 31 ... Ridge 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 part 47 ... Rear part 48 ... Nozzle hole 61 ... Valve body 62 ... Cylindrical piston 63 ... Front closing cylinder 66 ... Taper wall surface 71 ... Discharge valve 81 ... Coil spring 82 ... Elastic compression cylinder

Claims (3)

In a trigger type liquid ejector in which a nozzle fitting cylinder 21 is fitted to a front end of the liquid injection cylinder 15 and a nozzle 41 is fitted to the front of the cylinder,
The nozzle fitting tube 21 has a connection tube portion 23 projecting rearward from the substrate 22 watertightly fitted to the outer surface of the front end portion of the injection tube 15 and connected eccentrically to the connection tube portion from the front surface of the substrate 22. A fitting tube portion 24 having a larger outer diameter than the tube portion 23 and a cylinder 26 having a smaller diameter and a shorter diameter than the fitting tube portion 24 are provided to project forward with a small gap 25 between the fitting tube portion. A liquid outflow hole 27 communicating the small gap 25 and the injection cylinder 15 is connected to a part of the substrate between the fitting cylinder part 24 and the cylinder 26, and is connected to another part of the substrate from inside the cylinder. Air inlet / outlet holes 28 opening to the outer portion of the cylindrical portion 23 are respectively formed by drilling,
The nozzle 41 projects rearward from the front wall 42 through the fitting tube 43 and from the center of the front wall an inner cylinder portion 44 having a smaller inside diameter than the cylinder 26, and the fitting tube 43 is inserted into the fitting tube portion 24. The inner cylindrical portion 44 has a rear portion 47 with a larger inside diameter than the front end portion 46 through a rearwardly stepped valve seat 45 and a nozzle hole 48 is formed in a front wall portion surrounded by the inner cylindrical portion 44. Drilling and forming,
Further, between the cylinder 26 and the inner cylinder portion 44, a front closing cylinder 63 is projected forward from a cylindrical piston 62 fitted into the cylinder, and the front cylinder portion is fitted into the large inner diameter portion of the inner cylinder portion. A combined valve element 61 is provided,
The valve body is urged forward to press the outer periphery of the front end of the front closing cylinder 63 against the valve seat 45 to form the discharge valve 71,
The trigger is characterized in that the valve body 61 is retracted against the urging and the discharge valve 71 is openable by increasing the pressure in the valve chamber formed by the nozzle fitting cylinder 21 and the nozzle 41 due to the trigger pull. Liquid ejector. The guide rod 32 projects forward from the center of the substrate portion surrounded by the cylinder 26, and the rear part of the elastic compression cylinder 82, which is longer than the guide rod 32 and is elastically compressible, is fitted to the outer surface of the guide rod 32. 2. A trigger type liquid jet according to claim 1, wherein the front portion of the elastic compression cylinder is fitted into the valve body, and the valve body is urged forward by the elastic compression cylinder. vessel. The front inner circumferential surface of the front closing cylinder 63 of the valve body 61 is formed on a tapered wall surface 68 having a small diameter at the front, 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. Then, a cylinder 35 having a plate spring-like portion 34 between the split grooves is protruded forward, and the front end of each plate spring-like portion is brought into contact with the 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 spring-like portion.

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