JP3995783B2 - Liquid discharge device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid ejection device for liquid materials such as shampoo liquid, detergent, chemicals, glue, wax, paint and the like.
[0002]
[Prior art]
Conventionally, there is a liquid discharge device described in Japanese Utility Model Publication No. 7-16501. In this prior art, a piston is slidably accommodated in a pump cylinder provided in a body, and a flange of an intake cylinder 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 fluid passage of the intake cylinder, and the liquid material pressurized by the pump cylinder is discharged from the nozzle provided in the body. I am trying to discharge.
[0003]
In this prior art, the pump cylinder formed integrally with the body is provided with a cylinder vent hole that can communicate with the space outside the cylinder by the reciprocating movement of the piston, and the intake cylinder press-fitted into the body is the pump cylinder. A top surface portion facing the lower portion is provided, and an intake vent is provided in the top surface portion. Then, when the cylinder vent hole is exposed to the outside air by the reciprocating movement of the piston by the operation of the operating portion, the outside air can be introduced into the container body through the air replacement path including the cylinder vent hole and the intake vent hole. Thereby, in the liquid discharge device, 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 can be released.
[0004]
[Problems to be solved by the invention]
However, in the prior art, the intermediate portion of the air replacement path extending from the cylinder vent of the pump cylinder provided in the body to the intake vent of the intake cylinder is between the lower outer peripheral surface of the pump cylinder and the top surface of the intake cylinder. It is a space that expands widely. Therefore, when the spray container is turned upside down at the distribution stage of the spray container, etc., the liquid material in the container body becomes a space between the intake vent hole of the intake cylinder and the outer peripheral surface of the pump cylinder and the top surface of the intake cylinder. May flow into the liquid and cause a liquid pool there.
[0005]
At this time, if the liquid material contains, for example, sodium hypochlorite, an activator, etc., this extends to the stress generating portion which is the press-fitting portion between the body and the intake cylinder, and an environmental stress crack resistance (ESCR) is applied to the press-fitted portion. This may cause liquid leakage from the crack generation part.
[0006]
An object of the present invention is to prevent the occurrence of environmental stress cracking resistance at the press-fitting portion between a body and an intake cylinder when an air replacement path is provided around the body of the liquid ejection device.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, a piston is slidably accommodated in a pump cylinder provided in the body, and the flange of the intake cylinder press-fitted into the body is fastened to the opening of the container body by a cap. The piston in the pump cylinder is reciprocated by the operation unit, and the liquid material in the container body is sucked into the pump cylinder through the fluid passage of the intake cylinder, and the liquid material pressurized by the pump cylinder is removed from the body. A liquid discharge device that discharges from a nozzle provided in the pump cylinder, the pump cylinder being separated from the body and fitted into the body, and a cylinder vent hole that can communicate with the external space by reciprocating movement of the piston. A space that penetrates between the outer surfaces and communicates with the cylinder vent is formed at the interface between the body and the fitting portion of the pump cylinder. A liquid that forms a slipping passage in at least one of the body or the intake cylinder and seals the press-fitting portion of the intake cylinder with respect to the body against the internal space of the container body and the passage formed in at least one of the body or the intake cylinder. The seal portion is formed so as to be separated from the press-fitting portion of the intake cylinder with respect to the body toward the inner space of the container body.
[0008]
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 equal to or higher than the level of the horizontal plane including the cylinder central axis. It is designed to pass through the level.
[0009]
[Action]
According to the first aspect of the present invention, the following effects (1) to (3) are obtained.
{Circle around (1)} When the pump cylinder is provided with a cylinder vent hole that communicates with the inside of the container body and can communicate with the external space by reciprocating movement of the piston, the pump cylinder is separated from the body. By fitting the pump cylinder into the body and press-fitting the intake cylinder into the body, the intake cylinder can be isolated from the pump cylinder due to the presence of the body. A liquid seal portion that seals the press-fitting portion of the intake cylinder with respect to the body against the passage formed in at least one of the internal space of the container main body and the body or the intake cylinder and leading to the inside of the container main body. A space was formed from the press-fitting portion of the cylindrical body toward the inner space of the container body. Therefore, even if the liquid discharge device is turned upside down at 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 or the intake cylinder, this is the press-fitting of the intake cylinder. It does not reach the department. For this reason, even if the liquid material contains, for example, sodium hypochlorite, an activator, etc., it does not cause environmental stress cracking in the stress generation press-fitting portion of the intake cylinder to the body, and liquid leakage may occur. Absent.
[0010]
(2) Since the pump cylinder is separated from the body, it is not necessary to thinly mold the cylinder molding portion of the body in consideration of sink marks in the cylinder molding portion when molding the plastic body. That is, the thickness of the body can be increased and the occurrence of environmental stress cracking in the body can be prevented.
[0011]
(3) Since the pump cylinder is separated 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.
[0012]
According to the second aspect of the present invention, the following effect (4) is obtained.
(4) The space formed at the interface between the body and the fitting part of the pump cylinder passes through a level that is equal to or higher than the level of the horizontal plane including the center axis of the cylinder. Therefore, even if the container body is used while being tilted forward, the liquid level of the liquid in the container body does not reach a portion of the space above the level of the horizontal plane H including the cylinder central axis. Thus, when the container body is tilted forward, liquid leakage from the space to the external space through the cylinder vent hole does not occur.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic diagram showing the first embodiment, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a schematic diagram showing the second embodiment.
[0014]
First Embodiment (FIGS. 1 and 2)
As shown in FIG. 1, the trigger spray container 10 has a trigger sprayer 13 (liquid discharge device) fixed by a cap 12 screwed into the opening 11 </ b> A of the container body 11. And the spray container 10 discharges a paste, a coating agent, etc. in the injection form, for example from the nozzle hole 28A of the discharge nozzle 28 mentioned later.
[0015]
In the trigger sprayer 13, the upper end insertion hole 12 </ b> A of the cap 12 is loosely inserted in the outer periphery of the lower end opening 15 </ b> A of the body 15, and the intake cylinder 17 is press-fitted into the lower end opening 15 </ b> A of the body 15. The upper end insertion hole forming portion 12B of the cap 12 is engaged with the lower flange 17A of the intake cylinder 17 that is located below the lower end opening 15A and projects outward, so that the intake cylinder 17 can be relatively rotated. The lower flange 17A can be fixedly held in the opening 11A of the container body 11 via the gasket 14.
[0016]
The rod-shaped fluid passage forming portion 17B of the intake cylinder 17 is fitted into the intake fitting portion 15B of the body 15 to form a fluid passage 18 and a fluid passage tube 19 connected to the fluid passage 18 is fitted. The liquid passing tube 19 extends the container internal space 11B of the container main body 11 to the bottom.
[0017]
The trigger sprayer 13 has a trigger 21 (operation part) at the lower part on the front side of the body 15, and forms a pump chamber 22 </ b> A of a pump cylinder 22 provided in the front part of the intake cylinder 17 in the body 15. The piston 23 inserted into the pump chamber 22 </ b> A so as to be slidable in a liquid-tight manner with respect to 22 can be pressurized by a trigger 21. One end of the compression spring 24 is supported inside the spring support cylinder 15 </ b> C standing on the end face of the pump cylinder 22 facing the piston sliding direction, and the other end of the compression spring 24 is abutted against the piston 23. It has become. The pump chamber 22A communicates with the fluid passage 18 of the intake cylinder 17 through a fluid passage 25 provided outside the spring support tube 15C on the end surface facing the piston sliding direction of the pump cylinder 22. . The piston 23 is pushed into the pump chamber 22A from the original position against the spring force of the compression spring 24 in the pump cylinder 22 by the pressurizing operation (liquid material discharging operation) of the trigger 21, and the liquid material in the pump cylinder 22 is pressed. And a discharge pressure is generated in the pump chamber 22A. The piston 23 is returned to the original position by the spring force of the compression spring 24 by releasing the pressurizing operation of the trigger 21 (liquid material suction operation), and the pump chamber 22A is expanded to suck the liquid material into the pump cylinder 22. Thus, a suction pressure is generated in the pump chamber 22A.
[0018]
The trigger sprayer 13 has a discharge path 26 at the top of the body 15. The discharge passage 26 communicates with the liquid passage 18 of the intake cylinder 17 through the communication passage 27.
[0019]
In the spray container 10, the discharge nozzle 28 is mounted on the front surface of the trigger sprayer 13. The discharge nozzle 28 includes a nozzle hole 28 </ b> A connected to the discharge path 26 described above.
[0020]
The spray container 10 is provided with a ball-shaped inlet-side check valve 31 in the liquid passage 18 that is a communication passage between the pump chamber 22A and the container inner space 11B. As a result, the inlet check valve 31 (a) sits on the inlet valve seat 33 in the free state to close the fluid passage 18 and (b) opens the fluid passage 18 by the suction pressure of the pump chamber 22A. The liquid flow from the inner space 11B to the pump chamber 22A is allowed.
[0021]
In addition, the spray container 10 includes a stretchable outlet check valve 34 made of an elastic body (plastic) having a double cavity 34B in the liquid passage 18 that is a communication passage between the pump chamber 22A and the discharge port 28A. Is provided. The outlet check valve 34 has the upper part of the double cavity part 34B fixed to the upper part of the intake cylinder 17. (a) In a free state, the outlet side check valve 34 exits the valve element 34A by the elastic force of the double cavity part 34B. The liquid passage 18 is closed by being seated on the side valve seat 35, and (b) the liquid passage 18 is opened by the discharge pressure of the pump chamber 22A, and the flow of liquid from the pump chamber 22A through the discharge passage 26 to the discharge nozzle 28 is allowed. To do.
[0022]
However, in the trigger sprayer 13, as shown in FIG. 2, the pump cylinder 22 is plastic molded separately from the body 15, and the cylindrical pump cylinder 22 is fitted to the body 15. At this time, the body 15 is provided with a cylinder fixing rib 15E in the inner part of the cylinder fitting portion 15D, and the fitting end portion 22B of the pump cylinder 22 is locked to the cylinder fixing rib 15E so that the pump cylinder 22 is discharged by the discharge pressure. I try to prevent popping out.
[0023]
In the trigger sprayer 13, a cylinder vent hole 41 penetrating in and out of the pump cylinder 22 is provided in the pump cylinder 22. The cylinder vent hole 41 of the pump cylinder 22 can communicate with the external space on the inner surface of the cylinder by the reciprocating motion of the piston 23. Further, a cylinder vent groove 42 extending from the cylinder vent hole 41 to the fitting end portion 22B is provided on the outer surface of the pump cylinder 22, and a chamfered portion 43 following the cylinder vent groove 42 is provided on the outer periphery of the fitting end portion 22B of the pump cylinder 22. The body 15 is provided with a body vent hole 44 penetrating the body 15 at the innermost part of the cylinder fitting portion 15D of the body 15 and the fluid passage forming portion 17B of the intake cylinder 17 is fitted therein. The inner surface of the portion 15B is provided with a body ventilation groove 45 continuous with the body space 11B following the body ventilation hole 44. That is, the cylinder vent hole 41 of the pump cylinder 22 is communicated with the in-container space 11B by the air replacement path 46 formed by the cylinder vent groove 42, the space 43A, the body vent hole 44, and the body vent groove 45.
[0024]
At this time, since the chamfered portion 43 of the fitting end portion 22B of the pump cylinder 22 is continuously formed in the circumferential direction, as a result, a space 43A continuous in the circumferential direction between the cylinder fitting portion 15D of the body 15 is formed. 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 44 are separated from each other. Communication is always possible with 43A.
[0025]
As a result, in the spray container 10, the cylinder vent hole 41 and the cylinder vent groove 42 are opened by opening the cylinder vent hole 41 toward the external space by the reciprocating motion of the piston 23 by the operation of the trigger 21 that is the operation portion. The outside air can be introduced into the container body 11 by the air replacement path 46 including the space 43A, the body vent hole 44, and the body vent groove 45. Thus, the negative pressure in the container body 11 due to 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 can be released.
[0026]
Further, in the trigger sprayer 13, a liquid seal portion 52 that seals the press-fitting portion 51 of the intake cylinder 17 with respect to the lower end opening portion 15 </ b> A of the body 15 against the inner space 11 </ b> B and the air replacement path 46 is provided in the body. 15 is spaced from the press-fit portion 51 of the intake cylinder 17 with respect to the inner space 11B of the container. That is, the intake cylinder 17 includes an outer cylinder part 17C that is fitted to the lower end opening 15A of the body 15 and an inner cylinder part that is fitted to the outer surface of the lower cylindrical protrusion of the intake insertion part 15B of the body 15. 17D, a lower flange 17A on the outer surface of the outer cylindrical portion 17C, a liquid passage forming portion 17B on the inner side of the inner cylindrical portion 17D, and a top surface portion 17E between the outer cylindrical portion 17C and the inner cylindrical portion 17D. I am going to do that. The fitting portion between the lower end opening 15A of the body 15 and the outer cylinder portion 17C of the intake cylinder 17 is the above-described press-fit portion 51, and the lower end cylindrical protrusion and the intake cylinder of the intake insertion portion 15B of the pump 15 are used. The fitting portion with the 17 inner cylinder portion 17 </ b> D is the above-described liquid seal portion 52.
[0027]
Therefore, according to this embodiment, there are the following operations.
{Circle around (1)} The pump cylinder 22 is separated from the body 15 when the cylinder vent hole 41 that communicates with the air replacement path 46 and communicates with the external space by the reciprocating motion of the piston 23 is provided in the pump cylinder 22. 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 can be isolated from the pump cylinder 22 due to the presence of the body 15. Then, a liquid seal portion 52 that seals the press-fitting portion 51 of the intake cylinder 17 with respect to the body 15 against the air replacement path 46 provided around the inner space 11B and the body 15 of the intake cylinder 17 with respect to the body 15 is provided. The press-fitting part 51 was formed apart from the inner space of the container body 11. Therefore, even if the liquid discharge device is inverted in the distribution stage of the liquid discharge device and the liquid material in the container body 11 enters the air replacement path 46 provided around the body 15, this is the press-fitting portion of the intake cylinder 17. No more than 51. For this reason, even if the liquid material contains, for example, sodium hypochlorite, an activator, etc., the stress generation press-fitting portion of the intake cylinder 17 with respect to the body 15 does not cause environmental stress cracking and causes liquid leakage. There is nothing.
[0028]
(2) Since the pump cylinder 22 is separated from the body 15, it is not necessary to thinly mold the cylinder molding portion of the body 15 in consideration of sink marks in the cylinder molding portion when the body 15 is molded with plastic. That is, the body 15 can be made thick, and the occurrence of environmental stress cracking resistance in the body 15 can be prevented.
[0029]
(3) Since the pump cylinder 22 is separated from the body 15, the roundness of the cylinder 22 can be improved during plastic molding of the pump cylinder 22, and liquid leakage between the pump cylinder 22 and the piston can be prevented.
[0030]
Second Embodiment (FIG. 3)
The second embodiment is different from the first embodiment in that the cylinder vent hole 41 and the cylinder vent groove 42 of the pump cylinder 22 are formed by adjusting the fitting posture of the pump cylinder 22 with respect to the cylinder fitting portion 15D of the body 15. The cylinder fitting portion 15D is installed in a vertically upper position. The upper cylinder vent groove 42 and the lower body vent hole 44 are communicated with each other by a circumferentially continuous space 43 </ b> A formed in the fitting end 22 </ b> B of the pump cylinder 22. As a result, the air replacement path 46 formed at the interface between the fitting portion of the body 15 and the pump cylinder 22 passes through a level equal to or higher than the level of the horizontal plane H including the central axis of the cylinder 22.
[0031]
According to the present embodiment, even when the container body 11 is tilted forward, the liquid level in the liquid body in the container body 11 is above the level of the horizontal plane H including the central axis of the cylinder 22. Never reach the part. As a result, liquid leakage from the air replacement path 46 does not occur when the container body 11 is tilted forward.
[0032]
Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention.
[0033]
【The invention's effect】
As described above, according to the present invention, when an air replacement path is provided around the body of the liquid ejection device, it is possible to prevent the occurrence of environmental stress cracking resistance at the press-fitted portion between the body and the intake cylinder.
[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]
11 Container body 11A Opening 11B Container inner space 12 Cap 13 Trigger sprayer (Liquid discharge device)
15 Body 17 Intake cylinder 17A Flange 18 Fluid passage 21 Trigger (operation part)
22 Pump cylinder 23 Piston 28 Discharge nozzle (nozzle)
41 Cylinder vent 46 Air replacement path 51 Press-in part 52 Liquid seal part

Claims (2)

The piston is housed in a pump cylinder provided in the body so that it can slide liquid-tightly.
Fasten the flange of the intake cylinder pressed into the body to the opening of the container body with a cap,
The piston in the pump cylinder is reciprocated by the operation unit, and the liquid material in the container body is sucked into the pump cylinder through the fluid passage of the intake cylinder, and the liquid material pressurized by the pump cylinder is put into the body. A liquid discharge device for discharging from a nozzle provided,
The pump cylinder is separated from the body and fitted into the body, and a cylinder vent hole that can communicate with the external space by reciprocating movement of the piston is formed between the inner and outer surfaces of the pump cylinder and communicates with the cylinder vent hole. Forming a space at the interface between the body and the fitting portion of the pump cylinder, and forming a passage from the space into the container body in at least one of the body or the intake cylinder,
A liquid seal portion that seals the press-fitting portion of the intake cylinder with respect to the body with respect to the internal space of the container main body and the passage formed in at least one of the body or the intake cylinder, and A liquid ejection device, characterized in that the liquid ejection device is formed apart from the interior space of the main body. The liquid ejection device 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 equal to or higher than a level of a horizontal plane including the cylinder central axis.

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