JP3642887B2 - Trigger type liquid ejector discharge valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a discharge valve of a trigger type liquid ejector.
[0002]
[Prior art]
A general trigger-type liquid ejector that is attached to the mouth and neck of a liquid container that contains liquid is equipped with a plunger-type pump that is mechanically actuated by a trigger on the liquid ejector body. By pushing, the liquid in the pump is pressurized and ejected from the nozzle at the tip of the liquid ejector body, and the trigger is released and the trigger and plunger are returned by a spring built in the pump, so that the liquid in the container Is sucked into the pump.
Incidentally, this type of trigger type liquid ejector is disclosed in Japanese Utility Model Laid-Open No. 4-178558. In this case, the plunger type pump has a discharge valve built in a tip portion near the nozzle in the liquid ejector main body, and the discharge valve presses and seats the valve body on the valve seat with a predetermined elasticity. . In other words, in this discharge valve, when the pressure of the liquid pressurized by pushing the plunger exceeds the valve closing force of the spring, the pressurized liquid opens the valve body, and therefore, the pressure exceeds the predetermined pressure. Only liquid can be ejected and dripping can be reduced.
[0003]
[Problems to be solved by the invention]
However, in this case as well, the pressurized liquid that has passed through the discharge valve is further ejected from the nozzle hole via the flow path in the nozzle, so that the following problems still remain.
{Circle around (1)} At the beginning of pulling of the trigger, that is, at the beginning of pushing in of the plunger, while the leading pressurized liquid flows down the flow path in the nozzle, the efficiency is lowered with time delay or pressure loss. If the previously supplied liquid remains in the nozzle flow path and the nozzle hole, the residual liquid is pushed below a predetermined hydraulic pressure until the leading pressurized liquid reaches the nozzle hole. As a result, good jetting may not be obtained, and liquid dripping may occur from the nozzle hole due to the residual liquid.
(2) At the end of pulling of the trigger, that is, at the end of pushing of the plunger, with the closing of the discharge valve, the liquid in the nozzle passage and nozzle hole is still pressed by the closing valve body, and this nozzle passage and nozzle The liquid pressure in the hole does not drop rapidly, and therefore, the liquid breakage when the ejection stops stops and dripping may occur from the nozzle hole.
The present invention is intended to solve these problems.
[0004]
[Means for Solving the Problems]
From this point of view, the invention of claim 1 connects a nozzle 5 having a nozzle hole 4 in the center to a nozzle connecting cylinder 3 projecting from the discharge side end 2 of the liquid ejector body 1, and the nozzle A valve chamber 7 communicating with the discharge flow path 6 of the liquid ejector body 1 is formed inside the nozzle connecting cylinder 3, and the valve chamber 7 has a rear side of the nozzle 5 immediately behind the nozzle hole 4. Are provided with a valve hole 8 communicating with the nozzle hole 4 and a valve seat 9 facing rearward, and the valve seat 9 is opposed to the tip at the tip, the tip is open, the base is closed, and the inner periphery is more than the valve seat 9. A large small cylinder 10 is provided, and a hat-shaped valve body 12 having an outer periphery of a skirt 11 is slidably fitted to the small cylinder 10, and the valve body 12 is attached to the valve body 12 through the small cylinder 10. A spring 13 is installed to press and seat the valve body 12 against the valve seat 9; Characterized in that the drilled hole 14.
[0005]
The invention according to claim 2 is the discharge valve of the trigger type liquid ejector according to claim 1, wherein the spring is pointed from the closed proximal end of the small cylinder 10 in the small cylinder 10 to the valve body 12. A support bar 15 is provided so that the base end portion of the spring 13 is fitted and supported on the spring support bar.
[0006]
The invention according to claim 3 is the discharge valve of the trigger type liquid ejector according to claim 1 or 2, wherein a short valve body guide tube 30 is provided protruding from the periphery of the valve seat 9, and the valve body guide tube In this case, a notch 31 is formed at a proper position so that liquid can flow, and the valve body 12 is inserted and moved movably.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Part 1.
1 and 2 show an embodiment of a discharge valve of a trigger type liquid ejector in a valve closing state and a valve opening state according to the inventions of claims 1 and 2.
In the figure, 1 is a liquid ejector body in a trigger type liquid ejector, 2 is a discharge side end portion of the liquid ejector body, and the discharge side end portion is composed of a fitting horizontal cylinder heading forward.
Reference numeral 3 denotes a nozzle connecting cylinder projecting from the discharge side end 2, which has a vertical piece 16 covering the discharge side end 2 at the base end, and is fitted backward from the vertical piece. A horizontal cylinder 17 is provided so that the fitting horizontal cylinder is fixedly and watertightly fitted to the outer periphery of the fitting horizontal cylinder serving as the discharge side end 2, and the nozzle connecting cylinder 3 is surrounded by the vertical piece 16. A through hole 34 is formed in the inner upper portion, and the nozzle connecting cylinder 3 is opened to the discharge flow passage 6 in the liquid ejector body 1 and hence the discharge side end 2 by the through hole. An engaging protrusion 18 is provided around the outer periphery of the nozzle connecting cylinder 3.
Reference numeral 5 denotes a cap-shaped nozzle having a nozzle hole 4 in the center. The fitting peripheral wall 19 is fitted to the outer periphery of the nozzle connecting cylinder 3, and an engaging groove 20 is provided around the inner periphery of the fitting peripheral wall 19. Then, the engaging groove is engaged with the engaging protrusion 18 of the nozzle connecting cylinder 3. Further, a short fitting inner cylinder 21 is provided inside the fitting peripheral wall 19, and the fitting inner cylinder is fitted into the inner circumference of the nozzle connecting cylinder 3 in a watertight manner.
The nozzle hole 4 has an annular deep groove 22 around the outer surface of the central portion of the nozzle 5, a small cap-shaped nozzle piece 23 is fitted into the annular deep groove, and a spray spin groove at the center of the nozzle piece The liquid guide groove 25 is opened along the annular deep groove 22 from the nozzle groove with the spin groove into the nozzle 5. In the illustrated nozzle hole 4, the nozzle hole 24 with a spin groove for spraying is used, but it may be for straight injection or foaming.
[0008]
Reference numeral 7 denotes a valve chamber formed inside the nozzle 5 to the nozzle connecting cylinder 3, and the valve chamber communicates with the discharge flow path 6 of the liquid ejector body 1.
In the valve chamber 7, a valve hole 8 communicating with the nozzle hole 4, and thus the liquid guide groove 25, and a tapered valve seat 9 facing rearward are provided immediately behind the nozzle hole 4 in the nozzle 5. At the same time, by projecting a small cylinder 10 with the distal end open and the proximal end closed and having an inner diameter larger than that of the valve seat 9 from the vertical piece 16 to the front, Further, a hat-like valve body 12 having an outer periphery of a skirt 11 is slidably fitted in the small cylinder 10 so as to be slidable in the small cylinder 10. A coil spring 13 for energizing the valve body 12 is provided, the valve body 12 is pressed and seated on the valve seat 9, and a through hole 14 is formed in the center of the valve body 12.
15 is a spring support rod protruding forward from the vertical piece 16 in the small cylinder 10 to the valve body 12, and the spring support rod has a plurality of guide pieces 27 around the rod body 26, etc. It attaches to the space | interval, and the tip part of the rod body 26 thru | or the guide piece 27 is sharpened conically.
A nozzle hole cover plate 28 is disposed on the front surface of the nozzle 5 and pivotally attached 29 so as to be openable and closable at the top of the nozzle. The cover plate 28 is opened upward when liquid is ejected.
[0009]
With this configuration, when the pressurized liquid is supplied from the liquid ejector body 1 through the discharge flow path 6 by pulling the trigger and pushing the plunger in the closed state of FIG. Flows through the through hole 34 of the vertical piece 16 into the nozzle connecting cylinder 3 and into the valve chamber 7, and enters the periphery of the valve body 12 through the outside of the small cylinder 10. The pressurized liquid that has entered the periphery of the valve body 12 exerts a hydraulic pressure on the skirt 11 on the outer periphery of the valve body, and when the hydraulic pressure exceeds the elasticity of the coil spring 13 that presses the valve body 12, The valve body 12 is retracted against this, and the valve body 12 is separated from the valve seat 9 and is opened as shown in FIG. Along with the opening of the valve, only the pressurized liquid having a hydraulic pressure equal to or higher than a predetermined value is ejected from the nozzle hole 4. That is, in the case shown in the drawing, the pressurized liquid is ejected from the nozzle groove 24 with the spin groove through the liquid guide groove 25 to generate a good spray without dripping.
The discharge valve is arranged immediately behind the nozzle hole 4 and the flow path in the nozzle from the discharge valve to the nozzle hole 4 is extremely short and thin. At the beginning of pushing, there is almost no time delay or pressure loss while the first pressurized liquid flows down the flow path in the nozzle, and the efficiency is not deteriorated.
[0010]
Further, in the valve body 12, the through hole 14 acts as follows.
(1) If there is no through-hole 14, if the liquid in the valve chamber 7 enters the small cylinder 10 to the valve body 12, the valve body 12 will not operate, and the trigger is used to draw pressurized liquid. Even if the liquid is supplied, no liquid is ejected. However, the presence of the through hole 14 in the center of the valve body 12 prevents liquid in the valve chamber 7 from entering the small cylinder 10 to the valve body 12. The through hole 14 causes the intruding liquid to flow out toward the nozzle hole 4 at the same pressure as the fluid pressure in the valve chamber 7 when the valve body 12 is opened, so that the valve opening operation of the valve body 12 is not hindered. .
(2) At the end of pulling the trigger, that is, at the end of pushing the plunger, the valve body 12 is closed by the elasticity of the coil spring 13 when the hydraulic pressure of the supplied pressurized liquid falls below a predetermined value (note that the valve body 12 In the early stage of advancement, a part of the liquid on the nozzle hole 4 side is still pushed out from the nozzle hole 4 with a high hydraulic pressure by the pressure by the valve body 12). The inside of the nozzle 12 tends to become negative pressure, and accordingly, the through hole 14 draws the liquid in the valve chamber 7 on the nozzle hole 4 side into the small cylinder 10 to the valve body 12, The liquid is depressurized instantaneously. Therefore, the liquid breakage when the ejection stops is improved, and the liquid dripping from the nozzle hole is not caused. Further, the drawing of the liquid into the small cylinder 10 or the valve body 12 does not hinder the valve closing operation of the valve body 12.
(3) In the leak test between the valve seat 9 and the valve body 12 performed by supplying air to the valve chamber 7, the through hole 14 should also perform the leak test between the small cylinder 10 and the skirt 11 at the same time. Enable.
[0011]
Part 2.
FIG. 3 shows an embodiment of the discharge valve of the trigger type liquid ejector in the valve closing state according to the invention of claim 3.
In the discharge valve of the trigger type liquid ejector shown in FIGS. 1 and 2, a short valve body guide cylinder 30 is projected from the periphery of the valve seat 9 so that liquid can flow through the valve body guide cylinder at an appropriate place. A notch 31 is formed so that the valve body 12 can be inserted and removed movably, and stoppers 32 and 33 for preventing the valve body 12 from colliding with the inner edge of the valve body guide tube 30 and the outer periphery of the front end portion of the valve body 12 are provided. Provided.
In this case, the valve body guide cylinder 30 and the stoppers 32 and 33 accurately open and close the valve body 12 and hold the valve body 12 inserted in advance during assembly to facilitate assembly.
Other configurations and operations are the same as those in the case of FIGS. 1 and 2, and a description thereof will be omitted with the description of FIGS.
[0012]
【The invention's effect】
According to the first, second, and third aspects of the invention, the following effects can be achieved by the above-described configuration.
(1) A pressure accumulation type discharge valve can be installed in the nozzle 5 so that only pressurized liquid having a fluid pressure of a predetermined value or more can be ejected from the nozzle hole 4, and good ejection without dripping is achieved. In addition to being able to obtain, the discharge valve can be arranged behind the nozzle hole 4 and the flow path in the nozzle from the discharge valve to the nozzle hole 4 can be made extremely short and thin. In the beginning of pulling of the trigger, that is, at the beginning of pushing of the plunger, it is possible to eliminate the time delay and the pressure loss while the first pressurized liquid flows down the flow path in the nozzle, thereby improving the efficiency.
(2) By the through hole 14 drilled in the center of the valve body 12,
a. Even if liquid from the valve chamber 7 enters the small cylinder 10 to the valve body 12, the intruding liquid is directed to the nozzle hole 4 at the same pressure as the liquid pressure in the valve chamber 7 when the valve body 12 is opened. The valve body 12 can be opened without any trouble.
b. At the end of pulling of the trigger, that is, at the end of pushing of the plunger, the valve on the nozzle hole 4 side is placed in the small cylinder 10 through the valve body 12 due to the negative pressure in the small cylinder 10 through the valve body 12 as the valve body 12 is closed. The liquid in the chamber 7 can be drawn in, the liquid in the nozzle hole 4 can be instantaneously reduced in pressure, and the liquid can be properly discharged when the ejection stops, and the liquid dripping from the nozzle hole 4 is eliminated. be able to. Of course, the valve body 12 is not caused to malfunction, and the valve body 12 can be closed without any trouble.
c. In a leak test between the valve seat 9 and the valve body 12 performed by supplying air to the valve chamber 7, a leak test between the small cylinder 10 and the skirt 11 can be performed at the same time.
[0013]
In addition, according to the invention of claim 2, the assembly of the spring 13 can be facilitated by the spring support rod 15 having a sharp tip protruding from the small cylinder 10 to the valve body 12.
[0014]
According to the invention of claim 3, a short valve body guide cylinder 30 formed with a notch 31 so that liquid can flow in an appropriate position protrudes from the periphery of the valve seat 9 so that the valve body 12 is inserted and moved in a movable manner. Therefore, the valve body 12 can be accurately opened and closed, and when assembling, the valve body 12 can be fitted and held in advance in the valve body guide tube 30 to facilitate assembly. .
[Brief description of the drawings]
FIG. 1 is a cut-away side view in a closed state showing an embodiment of the invention relating to a discharge valve of a trigger type liquid ejector according to claims 1 and 2;
FIG. 2 is a cut-away side view of the embodiment in a valve-open state.
FIG. 3 is a cut-away side view in a closed state showing an embodiment of the invention relating to the discharge valve of the trigger type liquid ejector according to claim 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Liquid ejector main body 2 ... Discharge side edge part 3 ... Nozzle connection cylinder 4 ... Nozzle hole 5 ... Nozzle 6 ... Discharge flow path 7 ... Valve chamber 8 ... Valve hole 9 ... Valve seat 10 ... Small cylinder
11 ... Skirt 12 ... Valve
13 ... Spring 14 ... Through hole
15 ... Spring support rod 16 ... Vertical piece
17 ... Fitting horizontal tube 18 ... engaging ridge
19 ... Mating peripheral wall 20 ... engaging groove
21 ... Fitting inner cylinder 22 ... Annular deep groove
23… Nozzle piece 24… Nozzle hole with spin groove
25 ... Liquid guide groove 26 ... Rod
27 ... guide piece 28 ... lid plate
29… Pivoting 30… Valve guide tube
31… Notch 32, 33… Stopper
34 ... Through hole

Claims (3)

A cap-shaped nozzle 5 having a nozzle hole 4 in the center is connected to a nozzle connecting cylinder 3 that protrudes from the discharge side end 2 of the liquid ejector body 1, and the liquid is placed inside the nozzle 5 to the nozzle connecting cylinder 3. A valve chamber 7 communicating with the discharge flow path 6 of the ejector body 1 is formed, and a valve hole 8 communicating with the nozzle hole 4 is provided in the valve chamber 7 immediately behind the nozzle hole 4 in the nozzle 5. And a rear-facing valve seat 9, and a small cylinder 10 that is open at the distal end and closed at the distal end and closed at the distal end and whose inner circumference is larger than that of the valve seat 9. A valve body 12 having a skirt 11 provided on the outer periphery of 10 is slidably fitted, and a spring 13 for biasing the valve body 12 is provided in the valve body 12 to the small cylinder 10 to provide the valve body. 12 to which the valve seat 9 is pressed and seated, and a through hole 14 is formed in the center of the valve body 12. Discharge valve for rigger type liquid ejector. In the small cylinder 10 to the valve body 12, a spring support rod 15 having a tip sharpened from the closed base end of the small cylinder 10 is projected, and the base end portion of the spring 13 is fitted to the spring support rod. The discharge valve of the trigger type liquid ejector of Claim 1 supported. A short valve body guide tube 30 is provided so as to protrude from the periphery of the valve seat 9, and a notch 31 is formed in the valve body guide tube so that liquid can flow in an appropriate position, and the valve body 12 is movably inserted and inserted. The discharge valve of the trigger type liquid ejector of Claim 1 or Claim 2.

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