JP2005095766A - Cylindrical piston for pump type liquid ejector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical pump type liquid ejector which is formed to alleviate the friction resistance between the inside wall surface of a cylinder and the outside surface of a cylindrical piston inserted into the cylinder. <P>SOLUTION: The cylindrical piston is provided with a groove 72 or many recess parts 73 continuously formed like a groove on a seal part 71 which is formed on the outside surface of the cylindrical piston 11 and in water tight contact with the inside wall surface of the cylinder. A lubricant 74 is applied to the groove or the groove like recessed parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cylindrical piston of a pump type liquid ejector.

  The pump-type liquid ejector for attachment to the container body is roughly classified into a vertical pump type and a trigger type, but as shown in Patent Document 1, there is also a type provided so that the vertical pump can be operated by a trigger operation. It has been.

  As shown in Patent Document 1 described above, the vertical pump type is a pump in which a stem is erected from a cylindrical piston fitted into a cylinder, and a head with a nozzle is attached to the upper end of the stem. In addition, as disclosed in Patent Document 2, the trigger type normally protrudes from the upper end of the suction cylinder raised from the mounting cylinder for mounting the container body, and forwards a long and short double cylinder from the middle of the suction cylinder. Projecting and engaging the rear cylinder part between these two cylinders, engaging the front end of the closed cylindrical piston with the upper rear surface of the trigger pivoted to the front part of the injection cylinder, The cylinder piston is urged forward by a coil spring stretched into the side cylinder and the cylindrical piston, and the liquid in the container is sucked into the pressurization chamber formed between the inner and outer cylinders by swinging the trigger back and forth. The pressure chamber is By the indoor liquid is provided so as to eject from the nozzle of the injection cylinder front end.

The cylindrical piston is provided with a seal portion on the contact surface with the cylinder wall surface, and the seal portion is provided in watertight contact with the cylinder wall surface, and the seal portion is smoothly slid against the cylinder wall surface. In order to move, lubricant such as silicone oil is mainly applied to the cylinder wall surface.
JP 2002-11388 A JP 2001-314787 A

  The lubricant applied to the cylinder wall surface or the like may melt or flow out by the jetting liquid flowing into the cylinder, and the piston may not slide smoothly.

  In the present invention, a groove or the like is provided in a piston seal portion that is in watertight contact with the cylinder wall surface, and a lubricant is applied to the groove or the like so that the lubricant is not dissolved by the stored liquid. It is.

  As a first means, a groove 72 or a large number of recesses 73 continuous in a groove shape is provided around a seal portion 71 on the outer surface of the piston that is in watertight contact with the inner wall surface of the cylinder. Applied.

  As a second means, a seal portion 71 is formed on the inner surface of the rear cylinder portion of the cylindrical piston 61 fitted between the inner and outer double cylinders 53, 54 so as to be in watertight contact with the cylinder wall surface. Grooves 72 or a large number of recesses 73 that are continuous in the shape of a groove are provided around the outer surface, and lubricant 74 is applied to these grooves or the respective recesses.

  According to the first and second aspects, since the seal portion 71 of the piston is in watertight contact with the cylinder wall surface, the lubrication applied to the groove 72 or the continuous recess 73 provided around the seal portion. The agent does not directly touch the stored liquid that has flowed into the cylinder, so that it can be prevented from dissolving or flowing out into the stored liquid, and the function of the lubricant can be maintained for a long time. In particular, in the case of claim 2, since both the inner and outer surfaces of the cylindrical piston rear cylinder part are used as sliding surfaces with the cylinder wall surface, the sliding resistance on these both sliding surfaces can be reduced, and the effect is great. is there.

  The first embodiment shown in FIGS. 1 to 3 will be described below. This embodiment exemplifies a vertical pump type liquid ejector. First, a known part will be briefly described. First, 1 is a cylinder having an outward flange 2 on the upper outer surface, and the outer periphery of the outward flange It is detachably fitted into a recessed groove formed around the upper inner surface of the mounting cylinder 3 to be screwed onto the outer surface of the body mouth and neck, and its outward flange 2 is attached to the upper end surface of the container mouth and neck. It can be clamped by an inward flange 4 attached to the upper end of the cylinder.

  A cylindrical piston 11 is fitted into the cylinder, a stem 12 is erected from the cylindrical piston, and a pressing head 13 with a nozzle is fitted to the upper end of the stem. Further, the stem 12 is inserted and a retaining cylinder 21 is fitted to the upper end of the cylinder, and the cylindrical piston 11 urged upward by the coil spring 22 mounted in the cylinder is moved to the lower end of the retaining cylinder. The upper extraction is prevented in contact. A suction valve is provided in the lower part of the cylinder, and a discharge valve 14 is provided in the upper part of the stem 12.

  When the push-down head 13 is moved up and down several times from the state shown in the figure, and then the push-down head is pushed down, the liquid in the cylinder is ejected from the nozzle 15 through the discharge valve 14, and upwardly biased when the push-down head is released. As the piston rises, the inside of the cylinder becomes negative pressure, and the liquid in the container is sucked into the cylinder 1 through the suction pipe 7 that hangs down from the lower end of the cylinder and the suction valve in the lower part of the cylinder.

  5 and 6 show a second embodiment. The embodiment shows a trigger-type liquid ejector. First, a known part will be briefly described. First, 31 is a mounting cylinder that is screwed into the outer surface of the container mouth / neck, and from the upper inner surface of the mounting cylinder, The cylinder part 41 is erected, the suction pipe 42 is erected by penetrating the rear part of the top plate of the base cylinder part, the suction valve 43 is provided in the lower part of the suction cylinder, and the discharge valve 44 is provided in the upper part. Yes.

  A fitting cylinder 52 suspended from the lower surface of the body 51 is fitted to the outer surface of the base cylinder portion 41, and the body has a deep hole having a lower surface opening into which the suction cylinder is fitted. The body has cylinders 53 and 54 in the form of inner and outer double cylinders in the lower front part of the deep hole, and the injection cylinder 55 projects forwardly above these cylinders. In addition, a first liquid passage hole 56 is formed in the back of the upper part of the inner and outer cylinders so as to communicate with the inside of the suction cylinder 42, and a second liquid hole 57 is formed in the suction cylinder part in the rear of the injection cylinder. ing.

  The rear cylinder portion of the cylindrical piston 61 whose front is closed is fitted between the inner and outer cylinders, and the front end of the piston is engaged with the upper rear surface of the trigger 62 that is pivotally attached to the front portion of the injection cylinder. The cylindrical piston is biased forward by a coil spring 63 mounted in the inner cylinder 53 and the cylindrical piston 61.

  In the above configuration, the nozzle cap 64 previously fitted to the front end of the injection cylinder is rotated so that the injection cylinder hole and the nozzle hole communicate with each other, and the trigger is pulled after the trigger is operated several times in the communication state. When operated, the cylindrical piston 61 moves backward, and the pressurized chamber liquid in the rear part between both cylinders is ejected from the nozzle hole 65 of the nozzle cap fitted into the front end of the injection cylinder through the discharge valve 44 and the injection cylinder 55, When the trigger 62 is released, the cylinder piston 61 moves forward by the biasing force, and the negative pressure in the pressurizing chamber causes the liquid in the container to pass through the suction pipe and the suction valve 43 depending from the suction cylinder 42. Is sucked into the pressure chamber.

  7 and 8 show a third embodiment. This embodiment shows a well-known pressure accumulation type liquid ejector among the vertical pump type liquid ejectors. The liquid ejector has a small-diameter cylinder 81 that hangs down from the inside of the mounting cylinder 3 into the container body, and a large-diameter cylinder 82 that hangs down from the inside of the push-down head 13. And a cylindrical plunger 84 having a cylindrical piston 83 attached to the outer surface of the intermediate portion, and the lower and intermediate cylindrical pistons are fitted into the small-diameter cylinder 81, and the upper cylindrical piston is fitted into the large-diameter cylinder 82, respectively. When the pressure chamber formed by the small-diameter cylinder 81, the cylindrical plunger 84, and the large-diameter cylinder 82 is pressurized by the downward pressing of the pressing head 13, the pressure is increased by the coil spring 63 in the lower part of the cylinder 81. The cylindrical plunger 84 descends due to the difference in diameter between the large and small cylinders, and then the discharge valve body 85 rising from the upper surface of the cylindrical plunger descends away from the discharge valve seat 86, so that the high-pressure liquid in the pressurized chamber is ejected from the nozzle hole 65. And the high pressure When the state is resolved, the discharge valve is closed by the urging force, and then the push-down head 13 with the cylindrical plunger 84 and the large-diameter cylinder 82 is lifted so that the negative pressure in the pressurized chamber passes through the suction valve 43. The liquid in the container is sucked.

  In the present invention, in each pump-type liquid ejector as shown in each of the embodiments described above, the piston wall surface contacting the inner wall surface or the outer wall surface of the cylinder is formed as the seal portion 71, and the groove 72 or the groove is formed in the seal portion. A large number of recesses 73 that are continuous in the shape of a circle were provided, and a lubricant 74 such as silicone oil was applied to the grooves or recesses.

  3 and 7 show a groove 72, and FIG. 4 shows a large number of recesses 73 that are continuous in a groove shape. These grooves or recesses are provided so that the opening surface is sealed by the cylinder wall surface when the seal portion 71 is in watertight contact with the cylinder wall surface. In the embodiment described above, the main members including the cylindrical piston are all made of synthetic resin.

It is sectional drawing of a vertical pump type liquid ejector which has the cylindrical piston of this invention. It is an expanded sectional view of the principal part of FIG. It is an enlarged side view of the cylindrical piston which FIG. 1 has. 3 is a side view showing a cylindrical piston in a modified example. It is sectional drawing of the trigger type liquid ejector with a cylindrical piston of this invention shown in 2nd Embodiment. 5 is an enlarged cross-sectional view of the main part. It is a semi-sectional view of the pressure accumulation type liquid ejector with a cylindrical piston of the present invention shown in the third embodiment. 7 is an enlarged side view of a portion of FIG.

Explanation of symbols

1 cylinder 11 cylindrical piston
53 Inner cylinder 54 Outer cylinder
71 Seal part 72 Groove
73 Recess 74 Lubricant

Claims (2)

A groove 72 or a plurality of recesses 73 that are continuous in a groove shape are provided around the seal portion 71 on the outer surface of the piston that is in watertight contact with the inner wall surface of the cylinder, and a lubricant 74 is applied to these grooves or recesses. A cylindrical piston of a pump type liquid ejector. The inner and outer surfaces of the rear cylinder part of the cylindrical piston 61 fitted between the inner and outer double cylinders 53 and 54 are provided with a seal part 71 in watertight contact with the cylinder wall surface, and grooves are formed between the inner surface and the outer surface of these seal parts. A cylindrical piston of a pump-type liquid ejector characterized in that a large number of recesses 73 continuous in the form of 72 or grooves are provided around and a lubricant 74 is applied to the grooves or the respective number of recesses.

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