JPH11221501A - Liquid discharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent environment resistant stress cracking from being generated in a force-fitted part of a body and an intake cylindrical body when providing an air replacement route around the body of a liquid discharging device. SOLUTION: In a liquid discharging device, a pump cylinder 22 and a body 15 are not integrated into one body and an air replacement route 46 for making a cylinder vent hole 41 provided in the pump cylinder 22 communicating with a space in a vessel is formed on the interface of a fitting part of the pump body 15 and the pump cylinder 22. A liquid seal part 52 for sealing a force-fitted part 51 of an intake cylindrical body 17 with respect to the body 15 is isolated and formed toward the space in the vessel from the force-fitted part 51 of the intake cylindrical part 17 against the body 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid discharging apparatus for liquids such as shampoo liquids, detergents, chemicals, sizing agents, waxes, and paints.

[0002]

2. Description of the Related Art Conventionally, a liquid discharging apparatus has been used as a liquid discharging apparatus.
There is one described in JP-A-1. In this prior art, a piston is accommodated in a pump cylinder provided in a body so as to be slidable in a liquid-tight manner, and a flange of an intake cylinder body press-fitted into the body is fastened to a mouth portion of a container body by a cap. The piston is reciprocated by the operation unit, and the liquid material in the container body is sucked into the pump cylinder through the liquid passage of the intake cylinder, and the liquid material pressurized by the pump cylinder is supplied from a nozzle provided in the body. It discharges.

In this prior art, a pump cylinder formed integrally with a body is provided with a cylinder vent hole which can communicate with a space outside the cylinder by reciprocating of a piston, and an intake cylinder body press-fitted into the body is provided. A top surface facing the lower part of the pump cylinder is provided, and an intake vent is provided in the top surface. Then, the cylinder ventilation hole is exposed to the outside air by the reciprocating motion of the piston by the operation of the operation unit, so that the outside air can be introduced into the container body through the air replacement path including the cylinder ventilation hole and the intake ventilation hole. Thus, in the liquid discharge device, it is possible to cancel the negative pressure in the container body due to the liquid material in the container body being sucked into the pump cylinder by the liquid material suction operation of the operation unit.

[0004]

However, in the prior art, the intermediate portion of the air replacement passage extending from the cylinder ventilation hole of the pump cylinder provided in the body to the intake ventilation hole of the intake cylinder body is formed in the lower outer peripheral surface of the pump cylinder. It is a space that unfolds widely between the intake cylinder and the top surface. Therefore, when the spray container is inverted at the distribution stage of the spray container or the like, the liquid substance in the container body is allowed to pass through the intake vent of the intake cylinder to the space between the outer peripheral surface of the pump cylinder and the top of the intake cylinder. And may form a pool here.

[0005] At this time, if the liquid material contains, for example, sodium hypochlorite, an activator, etc., this reaches the stress generating portion which is the press-fit portion of the body and the intake cylinder, and the press-fit portion has environmental stress cracks ( (ESCR), and the liquid may leak from the cracked portion.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the occurrence of environmental stress cracks in a press-fit portion between a body and an intake cylinder when an air replacement path is provided around a body of a liquid discharge device.

[0007]

According to the present invention, a piston is accommodated in a pump cylinder provided in a body so as to be slidable in a liquid-tight manner, and a flange of an intake cylinder which is press-fitted into the body is capped. And the piston in the pump cylinder is reciprocated by the operation unit to suck the liquid material in the container body into the pump cylinder through the passage of the intake cylinder, and the pump cylinder A liquid discharge device that discharges a liquid material pressurized by a nozzle provided in a body, the pump cylinder being separate from the body, being fitted to the body, and communicating with the external space by reciprocating pistons. The obtained cylinder ventilation hole is formed to penetrate between the inner and outer surfaces of the pump cylinder, and a space communicating with the cylinder ventilation hole is formed at the interface between the body and the fitting portion of the pump cylinder. A passage leading from the space into the container body is formed in at least one of the body and the intake cylinder, and a press-fit portion of the intake cylinder into the body is formed in the internal space of the container body and at least one of the body and the intake cylinder. The liquid seal portion for sealing the formed passage is formed so as to be separated from the press-fit portion of the intake cylinder to the body toward the inner space of the container body.

According to a second aspect of the present invention, in the first aspect of the present invention, the space formed at the interface between the body and the fitting portion of the pump cylinder is formed in a horizontal plane including the cylinder center axis. It is provided so as to pass through a level higher than the level.

[0009]

According to the first aspect of the present invention, the following effects are obtained. When the pump cylinder is provided with a cylinder vent hole that communicates with the inside of the container body and that can communicate with the external space by the reciprocating motion of the piston, the pump cylinder is made separate from the body. By fitting the pump cylinder into this body and press-fitting the intake cylinder into the body,
The intake cylinder can be separated from the pump cylinder by the presence of the body. Then, the liquid seal portion that seals the press-fit portion of the intake cylinder to the body with respect to the internal space of the container main body and at least one of the body and the intake cylinder to seal the passage communicating with the inside of the container main body is provided. The container was formed so as to be spaced from the press-fit portion of the cylindrical body toward the inner space of the container body. Therefore, even if the liquid discharge device is inverted during the distribution stage of the liquid discharge device and the liquid material in the container body enters the above-mentioned passage formed in at least one of the body and the intake cylinder, it is pressed into the intake cylinder. No part. For this reason, even if the liquid material contains, for example, sodium hypochlorite, an activator, etc., it does not cause environmental stress cracking at the stress generating press-fitting portion of the intake cylinder with respect to the body, and also causes liquid leakage. Absent.

Since the pump cylinder is provided separately from the body, there is no need to form the cylinder molding portion of the body thinly in consideration of the sink of the cylinder molding portion during plastic molding of the body. That is, the thickness of the body can be increased, and the occurrence of environmental stress cracking in the body can be prevented.

Since the pump cylinder is provided separately from the body, the roundness of the cylinder can be improved during plastic molding of the pump cylinder, and liquid leakage between the pump cylinder and the piston can be prevented.

According to the second aspect of the present invention, the following operations are provided. The space formed at the interface between the fitting portion of the body and the pump cylinder passes through a level higher than the level of the horizontal plane including the cylinder center axis. Therefore, even when the container main body is used with the container tilted forward, the liquid level of the liquid material in the container main body does not reach the above-mentioned space portion which is higher than the level of the horizontal plane H including the cylinder center axis. Thus, when the container body is used forward, there is no liquid leakage from the space to the external space via the cylinder vent.

[0013]

FIG. 1 is a schematic view showing a first embodiment, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a schematic view showing a second embodiment.

(First Embodiment) (FIGS. 1 and 2) As shown in FIG. 1, a trigger type spray container 10 is provided with a trigger sprayer 13 (liquid) by a cap 12 screwed into an opening 11A of a container body 11. Discharge device). Then, the spray container 10 discharges a paste, a coating agent, and the like, for example, in a spray shape from a nozzle hole 28A of a discharge nozzle 28 described later.

The trigger sprayer 13 includes a body 15
The upper end insertion hole 12A of the cap 12 is loosely inserted into the outer periphery of the lower end opening 15A of the cap 12, and the intake cylinder 17 is press-fitted into the lower end opening 15A of the body 15, so that the body 1
The cap 1 is located on the lower flange 17A of the intake cylinder 17 which is located below the lower end opening 15A of the intake cylinder 5 and projects outward.
2, the upper end insertion hole forming portion 12B is relatively rotatably locked,
The cap 12 allows the lower flange 17A of the intake cylinder 17 to be fixedly held in the opening 11A of the container body 11 via the gasket 14.

The rod-shaped liquid passage forming portion 17B of the intake cylinder 17 is fitted into an intake fitting portion 15B of the body 15 to form a liquid passage 18, and the liquid passage 18 is formed.
The liquid passage tube 19 is fitted with the liquid passage tube 19, and the liquid passage tube 19 extends the inner space 11B of the container body 11 to the bottom.

The trigger sprayer 13 includes a body 15
Has a trigger 21 (operating portion) in the lower part on the front side of the body, forms a pump chamber 22A of a pump cylinder 22 provided in the front of the intake cylinder 17 in the body 15, and can slide in the pump cylinder 22 in a liquid-tight manner. The piston 23 inserted into the pump chamber 22A can be pressurized by the trigger 21. One end of a compression spring 24 is supported inside a spring support cylinder 15C provided on the end face of the pump cylinder 22 opposed to the piston sliding direction so that the other end of the compression spring 24 abuts on the piston 23. Has become. Pump room 2
2A is a liquid passage 25 provided on the end face of the pump cylinder 22 opposite to the piston sliding direction outside the spring support cylinder 15C.
Through the liquid passage 18 of the intake cylinder 17. By the pressurizing operation of the trigger 21 (liquid material discharging operation), the piston 23 is moved in the pump
4 against the spring force, and is pushed into the pump chamber 22A from the original position to compress the liquid material in the pump cylinder 22 and generate a discharge pressure in the pump chamber 22A. Also, the trigger 21
Release of the piston 23
Is returned to the original position by the spring force of the compression spring 24 and expands the pump chamber 22A to generate a suction pressure in the pump chamber 22A so as to suck the liquid material into the pump cylinder 22.

The trigger sprayer 13 has a body 15
Has a discharge path 26 at the top. The discharge passage 26 communicates with the liquid passage 18 of the intake cylinder 17 via a communication passage 27.

The spray container 10 has the above-described discharge nozzle 28 mounted on the front surface of the trigger sprayer 13. The discharge nozzle 28 has a nozzle hole 28A connected to the discharge path 26 described above.

The spray container 10 is provided with a ball-shaped inlet check valve 31 in the liquid passage 18 which is a communication passage between the pump chamber 22A and the container interior space 11B. Accordingly, the inlet check valve 31 (a) is seated on the inlet valve seat 33 in the free state to close the liquid passage 18 and (b) opens the liquid passage 18 by the suction pressure of the pump chamber 22A. Pump room 2 from inner space 11B
Allow liquid flow to 2A.

The spray container 10 has a pump chamber 22.
A to the liquid passage 18 which is a communication passage between the discharge port 28A and the discharge port 28A.
An extendable outgoing check valve 34 made of an elastic body (plastic) having a communicating cavity 34B is provided. The outlet-side check valve 34 connects the upper part of the double hollow portion 34B to the intake cylinder 17.
(A) In a free state, the valve element 34A is moved by the resilience of the dual cavity portion 34B to the outlet valve seat 35.
And the liquid passage 18 is closed. (B) The liquid passage 18 is opened by the discharge pressure of the pump chamber 22A to allow the flow of the liquid from the pump chamber 22A to the discharge nozzle 28 via the discharge path 26.

However, in the trigger sprayer 13, as shown in FIG.
The cylindrical pump cylinder 22 is fitted to the body 15 by plastic molding separately from the body 5. At this time, the body 15 is provided with a cylinder fixing rib 15E at the back of the cylinder fitting portion 15D, and the fitting end 2 of the pump cylinder 22 is provided.
2B is locked to the cylinder fixing rib 15E to prevent the pump cylinder 22 from jumping out due to the discharge pressure.

In the trigger sprayer 13, a cylinder ventilation hole 41 penetrating inside and outside the pump cylinder 22 is provided.
Is provided on the pump cylinder 22. Pump cylinder 2
The two cylinder vents 41 can communicate with the external space on the inner surface of the cylinder by the reciprocating motion of the piston 23.
The outer surface of the pump cylinder 22 has a cylinder ventilation hole 4.
The pump cylinder 22 has a cylinder ventilation groove 42 extending from the fitting end 22B to the fitting end 22B, and a chamfered portion 43 following the cylinder ventilation groove 42 is formed on the outer periphery of the fitting end 22B of the pump cylinder 22. A body ventilation hole 44 penetrating the body 15 is provided at the innermost portion of the intake cylinder 17.
On the inner surface of the intake fitting portion 15B of the body 15 into which the liquid passage forming portion 17B is fitted, a body ventilation groove 45 is formed following the body ventilation hole 44 and continuing to the container interior space 11B. That is, the cylinder vent 41 of the pump cylinder 22
Are the cylinder ventilation groove 42, the space 43A, the body ventilation hole 4
4. The air exchange passage 46 formed by the body ventilation groove 45 communicates with the container interior space 11B.

At this time, the chamfered portion 43 of the fitting end portion 22B of the pump cylinder 22 is formed continuously in the circumferential direction. Even if the pump cylinder 22 rotates with respect to the cylinder fitting portion 15D of the body 15 and the arrangement of the cylinder ventilation groove 42 with respect to the body 15 fluctuates, the cylinder ventilation groove 42 and the body ventilation hole 4 are formed.
4 can be always communicated with the space 43A.

Thus, in the spray container 10, the piston 2 is operated by operating the trigger 21 which is an operation unit.
By opening the cylinder ventilation hole 41 toward the external space by the reciprocating motion of 3, the air replacement path 46 including the cylinder ventilation hole 41, the cylinder ventilation groove 42, the space 43A, the body ventilation hole 44, and the body ventilation groove 45, The outside air can be introduced into the container body 11. This makes it possible to cancel the negative pressure in the container body 11 caused by the liquid material in the container body 11 being sucked into the pump chamber 22A of the pump cylinder 22 by the liquid material suction operation of the trigger 21.

Further, in the trigger sprayer 13, a liquid seal portion 52 for sealing the press-fit portion 51 of the intake cylinder 17 into the lower end opening portion 15A of the body 15 with respect to the container interior space 11B and the air replacement passage 46. From the press-fitting portion 51 of the intake cylinder 17 to the body 15 toward the inner space 11B of the container. That is, the intake cylinder 17 has an outer cylinder 17C fitted to the lower end opening 15A of the body 15 and an inner cylinder fitted to the outer surface of the lower cylindrical protrusion of the intake fitting 15B of the body 15. 17
D and a lower flange 17A on the outer surface of the outer cylindrical portion 17C.
Is provided with a liquid passage forming portion 17B inside the inner cylindrical portion 17D, and a top surface portion 17E between the outer cylindrical portion 17C and the inner cylindrical portion 17D. Then, the lower end opening 15A of the body 15
The fitting portion between the outer cylinder portion 17C of the intake cylinder 17 and the outer cylinder portion 17C is the above-described press-fitting portion 51, and the intake fitting portion 15 of the pump 15 is
B and the inner cylindrical portion 17 of the intake cylindrical body 17
The fitting portion with D is the liquid seal portion 52 described above.

Therefore, according to the present embodiment, the following effects are obtained. It communicates with the air displacement path 46 and
Cylinder vent 4 that can communicate with the external space by reciprocating motion of
When the pump cylinder 22 was provided with the pump cylinder 22, the pump cylinder 22 was separated from the body 15. This body 15
The pump cylinder 22 is fitted into the body 15 and the intake cylinder 17 is press-fitted into the body 15 so that the intake cylinder 17 is
2 and could be isolated. Then, the press-fit portion 51 of the intake cylinder 17 into the body 15 is
B, and a liquid seal portion 52 that seals against the air replacement passage 46 provided around the body 15 is formed separately from the press-fit portion 51 of the intake cylinder 17 to the body 15 toward the inner space of the container body 11. Therefore, even if the liquid ejection device is inverted during the distribution stage of the liquid ejection device or the like and the liquid material in the container body 11 enters the air replacement path 46 provided around the body 15, the liquid material is pressed into the press-fit portion of the intake cylinder 17. It does not reach 51. For this reason, even if the liquid material contains, for example, sodium hypochlorite, an activator, etc., it does not cause environmental stress cracking at the stress generating press-fitting portion of the intake cylinder 17 with respect to the body 15 and causes liquid leakage. Not even.

Since the pump cylinder 22 is provided separately from the body 15, it is not necessary to form the cylinder molding portion of the body 15 thin in consideration of the sink of the cylinder molding portion when molding the plastic of the body 15. That is, the thickness of the body 15 can be increased, and the occurrence of environmental stress cracking in the body 15 can be prevented.

Since the pump cylinder 22 is provided separately from the body 15, the roundness of the cylinder 22 can be improved when the pump cylinder 22 is molded from plastic, and liquid leakage between the pump cylinder 22 and the piston can be prevented.

(Second Embodiment) (FIG. 3) The second embodiment differs from the first embodiment in that
By adjusting the fitting posture of the pump cylinder 22 with respect to the cylinder fitting portion 15D, the cylinder ventilation hole 41 and the cylinder ventilation groove 42 of the pump cylinder 22 are installed vertically above the cylinder fitting portion 15D of the body 15. The upper cylinder ventilation groove 42 and the lower body ventilation hole 44 communicate with each other by a circumferentially continuous space 43A formed in the fitting end 22B of the pump cylinder 22. Thus, the air replacement path 46 formed at the interface between the fitting portion of the body 15 and the pump cylinder 22 is
It passes through a level higher than the level of the horizontal plane H including the central axis of No. 2.

According to this embodiment, even when the container body 11 is used with the container body 11 tilted forward, the liquid level of the liquid material in the container body 11 is higher than the level of the horizontal plane H including the central axis of the cylinder 22. It does not reach the part of the replacement path 46. Accordingly, when the container body 11 is used forwardly, there is no occurrence of liquid leakage from the air replacement passage 46.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific structure of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0033]

As described above, according to the present invention, when providing an air replacement path around the body of the liquid discharge device, it is possible to prevent the occurrence of environmental stress cracking at the press-fitting portion between the body and the intake cylinder. it can.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a first embodiment.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a schematic diagram showing a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Container main body 11A Opening part 11B Container space 12 Cap 13 Trigger sprayer (liquid discharge device) 15 Body 17 Intake cylinder 17A Flange 18 Liquid passage 21 Trigger (operation part) 22 Pump cylinder 23 Piston 28 Discharge nozzle (nozzle) 41 Cylinder ventilation hole 46 Air replacement path 51 Press-fit part 52 Liquid seal part

Claims (2)

[Claims] A piston is accommodated in a pump cylinder provided in a body so as to be slidable in a liquid-tight manner. A flange of an intake cylinder press-fitted into the body is fastened to an opening of a container body by a cap. The piston is reciprocated by the operation unit,
A liquid discharging device that sucks a liquid material in a container body into a pump cylinder through a liquid passage of an intake cylinder and discharges a liquid material pressurized by the pump cylinder from a nozzle provided in a body, The pump cylinder is separate from the body and fitted to the body, and a cylinder ventilation hole that can communicate with the external space by the reciprocating motion of the piston is formed to penetrate between the inner and outer surfaces of the pump cylinder and communicates with the cylinder ventilation hole. A space is formed at the interface between the fitting portion of the body and the pump cylinder, and a passage leading from the space into the container body is formed in at least one of the body and the intake cylinder. A liquid seal portion that seals with respect to the internal space of the main body and the above-described passage formed in at least one of the body and the intake cylinder is provided. Liquid discharge apparatus characterized by comprising spaced apart form the press-fit portion of the intake cylinder into the inner space side of the container body with respect to the body. 2. The liquid discharge according to claim 1, wherein a space formed at an interface between the body and the fitting portion of the pump cylinder is provided so as to pass through a level higher than a level of a horizontal plane including the cylinder center axis. apparatus.