JPH0657449U - Liquid injection device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To obtain a liquid ejecting apparatus in which the return spring is prevented from rusting and the push-down head is attached so as not to come off due to the spring force of the return spring. [Structure] A cylinder 3 provided with a suction valve 2 at the bottom opening and internally fixed to the neck of the container body by a screw cap 1.
And a nozzle tube 12 connected to the stem 11 by a communication tube 13
And a movable part of a liquid ejection path system of a push-down head 14 and a cylindrical piston 8 of a driven discharge valve which is slidably arranged between the outer surface of the piston guide 7 of the discharge hole 4 and the inner surface of the cylinder 3, In the liquid ejecting apparatus including the return spring 18 that pushes up and urges the movable portion, the return spring 18 is attached to the screw cap 1.
The stem 11 and the piston guide 7 are arranged between the upper surface and the lower surface of the push-down head 14, and the communication pipe 13 of the push-down head 14 and the stem 11 are connected to each other by a joint pipe 17 that is bite-connected to each other.
A liquid ejecting apparatus having a structure in which the engaging projection 9 and the engaging groove 10 are joined together.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid ejection device formed by a manually operated pump.

[0002]

[Prior art]

 Many kinds of injection devices of this kind have been proposed so far, and they are very well known, and Japanese Utility Model Application No. 2-91802 is one of them.

As can be seen from this example, the basics of the liquid ejecting apparatus are that a suction valve is provided at the bottom opening, a fixed portion of a cylinder internally fixed to the neck portion of the container body by a screw cap, and an internal fitting to this cylinder. A cylindrical piston, a lower part fixed to this cylindrical piston or a stem that is connected to and linked to the driven relationship and rises to the outside above, a nozzle pipe that projects to one side and is fixedly connected to the upper end of the stem It is composed of a movable part with a discharge valve of the head and a return spring that is installed in the cylinder and constantly pushes up the movable part to urge it.

With this configuration, when the liquid is ejected, it is sufficient to push down the movable portion against the return spring via the push-down head. Then, after the discharge valve is opened, the cylindrical piston is pushed down to the same body and the cylinder inside the cylinder is pushed down. The liquid is pressurized, and the pressurized liquid is ejected from the nozzle pipe through the stem through the discharge valve and the stem.

When the pushing down is stopped at the end of injection, the movable part returns upward by the return spring, the return valve closes due to this return, and the inside of the cylinder becomes negative pressure, whereby the suction valve opens and the liquid inside the container is opened. Is sucked into the cylinder to prepare for the next injection.

[0006]

[Problems to be solved by the device]

 Including the above example, the return spring that pushes up and urges the moving part in this type of injection device is usually installed in the cylinder, so it is always immersed in the liquid, and therefore rusts and the spring itself. Not only will it damage the product and shorten its life, but it may also change the quality of the liquid.

According to the present invention, the return spring is arranged in the outer space between the upper surface of the screw cap and the lower surface of the pressing head above the screw cap to prevent rusting, and the pressing head may be pulled out by the spring force of the returning spring. To get a liquid injection device with no mounting.

[0008]

[Means for Solving the Problems]

 The liquid ejecting apparatus of the present invention comprises a cylinder 3 internally fixed to the neck of a container body by a screw cap 1 and having a suction valve 2 at a bottom opening, and a pipe body having a closed bottom opening, which is discharged to a lower side wall. A piston guide 7 is formed by opening a hole 4 and branching a diameter-expanding tube 5 fitted in the cylinder 3 from the lower outer surface of the discharge hole 4 to rise upward, and through-hole 6 is opened in the diameter-expanding tube 5. A cylindrical piston 8 of a driven type which is also used as a discharge valve and which is arranged so as to slide between the piston guide 7 of the discharge hole 4 portion and the cylinder 3; The stem 11 is connected by the engagement of the recessed groove 10 and extends upward and outward, the nozzle pipe 12 is projected from one side, and the communication pipe 13 on the lower surface is fitted and communicated with the upper part of the stem 11 by the pressing head 14, which is made of a hard material It is a pipe and has a large piercing bar 15 on the outer peripheral surface. In the middle part, several small barbs 16 project outward and are fitted inside from the stem 11 to the communication pipe 13.The small barbs 16 are connected to the inner surface of the stem 11 by biting, and the large bar 15 Is provided between the upper surface of the screw cap 1 and the lower surface of the pressing head 14 and the movable portion of the connecting pipe 17 in which the connecting pipe 13 and the stem 11 are firmly connected to each other by being embedded in the inner surface of the communicating pipe 13. It has a return spring 18 and.

[0009]

[Action]

 1A, 1B, 1C, the movable portion of the pressing head 14, the stem 11, the piston guide 7, and the tubular piston 8 that also serves as the discharge valve is normally moved by the return spring 18 via the pressing head 14 as shown in the drawing. The valve is pushed up to the upper limit position, and the discharge valve is closed at this position. At this time, the suction valve 2 is in the open state, but the suction port is in an extremely narrow gap, so that it is close to being substantially closed.

At the time of liquid injection, the movable portion is pushed downward against the return spring 18 via the push-down head 14. Then, initially, the piston guide 7 descends earlier than the cylindrical piston 8, so that the discharge valve is opened. At this time, since the suction valve 2 is in the closed state, the liquid in the cylinder 3 is driven and descends. Then, the pressurized liquid is ejected from the nozzle tube 12 to the outside through the through hole 6, the ejection hole 4, the piston guide 7 and the stem 11.

When the liquid injection is finished and the pressing is stopped, the movable part is returned to the original state shown in the drawing by the return spring 18, the initial discharge valve is closed and the inside of the cylinder 3 becomes negative pressure, while the suction valve is closed. Since 2 is pulled up and is in the valve open state, the cylinder 3 sucks the liquid from the container body (not shown) through the suction valve 2 and prepares for the next injection. The spherical valve system shown in FIGS. 2a, 2b, and 2c has substantially the same operation, and therefore its explanation is omitted.

In this device of the present invention, the return spring 18 is disposed in the upper external space between the upper surface of the screw cap 1 and the pressing head 14, so that it does not come into contact with liquid and rust can be prevented. Further, in the arrangement of the return spring 18, since the spring force is directly applied to the pressing head 14, there is a concern that the pressing head 14 may come off from the stem 11 or the piston guide 7 without the stem 11 and come out. The lowering head 14 and the stem 11 are firmly connected to each other by a joint pipe 17 which is bite-connected to each other, and the stem 11 and the piston guide 7 are engaged and connected by the engaging projection 9 and the engaging groove 10. Each bond is strong and there is almost no risk of slipping out.

[0013]

【Example】

 An embodiment will be described below with reference to FIGS. 1a, 1b, 1c and 1c.

The fixed portion includes a screw cap 1 and a cylinder 3.

The screw cap 1 has an opening at the center of the top wall, and a holding cylinder 19 having a partial U-shaped cross-section is erected on the periphery of the opening, and the holding cylinder 19 is locked to the outer periphery of the upper end from the top. The inner fixed guide peripheral wall 21 provided with the projecting ridges 20 and the outer fixed guide peripheral wall 22 are provided upright from the peripheral portion of the top wall, and the mounting peripheral wall 23 is screwed and attached to a not-shown container body neck portion.

The cylinder 3 has a vertical shape, and the lower portion thereof is inclined and reduced in diameter to form a valve seat 24 of the suction valve 2, and a suction pipe 26 communicates downward from a connecting cylinder 25 below the valve seat 24, Further, a cylindrical valve stopper 27 shown in Fig. B is fixed to the inner wall surface of the intermediate diameter portion just above the valve seat 24, and the upper portion is inserted and fixed to the holding cylinder 19 and is suspended and mounted inside the neck portion of the container body. ing.

A valve shaft 28 is provided at the center of the cylinder 3. The lower half of the valve shaft 28 has a thick shaft and the upper half has a thin shaft. The cylindrical lower end surface of the valve shaft 28 is inclined to form the valve body 29 of the valve 2 and the lower outer circumference. A stopper 30 that locks to the lower end of the valve stopper 27 is arranged so as to project in the circumferential direction so that it can move up and down for a short distance. It forms the valve 2 function.

Next, the movable part comprises a piston guide 7, a cylindrical piston 8, a stem 11, a pressing head 14, and a joint pipe 17.

The piston guide 7 is a vertically long pipe body, the lower end of which is slidably press fitted onto the upper portion of the valve shaft 28, in other words, the lower end port is closed by the valve shaft 28, and the cylinder guide is attached from the lower portion. (3) The expanded pipe 5 that slidably contacts the inner circumference is branched, and through holes 6 are formed in the middle part of the expanded pipe 5 in the circumferential direction and in the vertical direction, and the discharge hole 4 is formed in the side wall near the lower part. An engaging groove 10 is provided on the outer periphery of the upper part of the upper part and is raised to the outside.

The cylindrical piston 8 also serves as a discharge valve, and is disposed in sliding contact between the outer surface of the piston guide 7 and the inner surface of the cylinder 3, and these sliding contact surfaces are curved elastic surfaces. The discharge hole 4 and the intake hole 31 on the cylinder 3 side are closed at the upper limit position.

The stem 11 has a lower half part fitted onto the upper half part of the piston guide 7 and extends upward, and an engaging projection 9 is projected on the inner circumference of the middle part. It is engaged with the groove 10 and is firmly connected to the piston guide 7.

The push-down head 14 projects a communication pipe 13 at the center of the lower surface and a nozzle pipe 12 that communicates with the communication pipe 13 at one side, and a movable-side guide cylinder 32 vertically extends from the peripheral edge. 32 A locking projection 33 is provided on the inner circumference of the lower end, and the projection 33 is engaged with the projection 20 to prevent the slip-out, and the communication pipe 13 is fitted on the upper end of the stem 11 so that the stem 11 Is in communication with. Reference numeral 34 is a circumferentially-distributed spacing plate.

The connecting pipe 17 is made of a hard resin material such as polyacetal resin which is harder than the polyethylene resin forming the stem 11 and the pressing head 14, and as shown in the enlarged view of FIG. The large piercing bar 15 with a triangular cross-section whose part is diagonally cut and whose peripheral edge is an acute angle is protruded, and is vertically separated from the outer surface of the middle abdomen appropriately, and the lower surface side is obliquely cut to form an acute edge. It has a shape in which the three small projecting ridges 26 are projected, and is fitted into the stem 11 leaving the large piercing bar 15 at the upper end. However, when the stem 11 is fitted into the communicating tube 13, the large projecting bar 15 is also fitted inside, and the large projecting bar 15 is embedded in the inner wall surface of the communicating tube 13 by this fitting. And the press-down head 14 are firmly connected by these bite connections. To have. In this bite connection, there is no gap in the connecting portion unlike the engagement between the engaging protrusion and the engaging groove, so that the connection is stronger.

Next, the return spring 18 is a coil made of metal, and is disposed between the upper surface of the holding cylinder 19 on the upper surface side of the screw cap 1 and the spacing plate 34 on the lower surface of the pressing head 14, and the pressing head 14 The movable part is constantly urged upwards via the.

It should be noted that the stem 11 has a protruding edge on the outer surface of the lower end locked to the downward step portion 35 of the inner circumference of the holding cylinder 19 of the screw cap 1, and therefore the state shown in the figure is the upper limit position of the movable portion. .

According to the structure of this embodiment, the return spring 18 is arranged in the external space between the upper surface of the screw cap 1 and the lower surface of the pressing head 14 and does not touch the stored liquid so that it does not rust, and therefore the rod itself. It is possible to solve the problems such as the damage and the deterioration of the liquid.

Further, the pressing head 14 and the stem 11 and the stem 11 and the piston guide 7 are fitted to each other by providing a ring-shaped line on one surface as shown by reference numerals 36 and 36 in FIG. Since the connection was due to the frictional resistance, when the spring force of the return spring 18 is directly applied to the push-down head 14, the push-down head 14 may come loose due to the loose connection. In the present invention, the push-down head 14 and the stem 11 are connected to each other by the joint pipe 17 which is integrally connected by biting by the large projecting bar 15 and the small projecting bar 16 group, and the stem 11 and the piston guide 7 are connected. Since the engaging projection 9 and the engaging groove 10 are engaged and connected, the connection is strong and the risk of disconnection can be eliminated.

Of course, in the present invention, the conventional connection by frictional resistance may be used together with the communication pipe 13 and the stem 11 and the connection between the stem 11 and the piston guide 7.

2a, 2b and 2c show the engagement connection between the ridge 9 and the groove 10 of the present invention and the biting connection by the joint pipe 17 as the suction valve 2 and the discharge valve 37 made of ceramic, synthetic resin or the like. It shows the case of applying to a liquid injection device of the type that uses a spherical valve made of non-metallic material that does not rust. Therefore, the discharge valve is a double valve including the spherical discharge valve 37 and the cylindrical piston 8.

In this example, since the suction valve 2 is a spherical valve, a valve stopper 27 having four inwardly projecting parts on the inner peripheral surface as shown in FIG. The shaft 28 is omitted, so that the lower end opening of the piston guide 7 is a closed end. Further, since the spherical discharge valve 37 is usually arranged on the upper part of the stem 11, in this example, a flange 38 is provided obliquely inward and downward from the inner surface of the middle abdomen of the joint pipe 17, and is arranged on this flange 38. Also in this example, the same operation and effect as those of the example of FIG.

[0031]

[Effect of device]

 As described above, in the liquid ejecting apparatus of the present invention, the return spring 18 is arranged in the external space between the upper surface of the screw cap 1 and the lower surface of the pressing head 14, and the pressing head 14 and the stem 11 are embedded in each. Since the connecting pipe 17 is firmly connected and the stem 11 and the piston guide 7 are firmly engaged and connected by the engaging projection 9 and the engaging groove 10, the rust of the return spring 18 is prevented. Not only can this be prevented, but also the possibility of the push-down head 14 coming off due to the spring force of the return spring 18 being eliminated can be eliminated, and the reliability of the device can be improved.

[Submission date] July 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

[Action]

FIG. 1 shows a normal state. In this state, the movable portion of the push-down head 14, the stem 11, the piston guide 7, and the cylindrical piston 8 also serving as the discharge valve is moved to the upper limit position by the return spring 18 via the push-down head 14. The cylindrical piston 8 also serving as the discharge valve is pushed to the upper limit position at this position to close the discharge hole 4, that is, close the discharge valve, and at this time, the suction valve 2 is in the open state .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

The connecting pipe 17 is made of a hard resin material such as polyacetal resin which is harder than polyethylene resin forming the stem 11 and the pressing head 14. As shown in the enlarged view of FIG. The upper surface side is cut diagonally and the peripheral edge becomes an acute angle. A large projecting ridge 15 with a triangular cross-section partially protrudes, and is vertically separated from the outer surface of the middle abdomen, and the lower surface side is obliquely cut to form an acute edge. It is a shape in which three small streak ridges 16 are projected, and it is fitted inside the stem 11 leaving the large stud 15 at the upper end. When the stem 11 is fitted into the communicating tube 13, the large projecting bar 15 is also fitted therein, and the large projecting bar 15 is fitted into the inner wall surface of the communicating tube 13 by this fitting. And combine them together, The stem 11 and the push-down head 14 are firmly connected. In this bite-in connection, there is no gap at the connecting portion unlike the engagement between the engaging projection and the engaging groove, so that the connection is stronger.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

There is a gap between the outer peripheral edge of the lower end of the stem 11 and the downward step 35 of the inner circumference of the holding cylinder 19 of the screw cap 1 , and the outer peripheral wall of the piston 8 is the inner circumference of the holding cylinder 19. It is shown the state in which sealed contact engagement under end is the upper limit position of the movable portion.

[Brief description of drawings]

1A is a longitudinal sectional view of a part of an embodiment, FIG. 1B is an external perspective view of a valve stopper of the embodiment, and FIG. 1C is an enlarged view of a joint portion by a joint pipe of a.

2A and 2B show an example of application to a liquid injector of a spherical valve system, in which a is a half longitudinal sectional view, b is an external perspective view of a valve stopper of a, and c is an enlargement of a joint portion by a connecting pipe of a. It is a figure.

[Explanation of symbols]

 1 Screw cap 7 Piston guide 8 Cylindrical piston 9 Engaging projection 10 Engaging groove 11 Stem 14 Push-down head 17 Joint pipe 18 Return spring

Claims (1)

[Scope of utility model registration request] 1. A cylinder 3 internally fixed to the neck of a container body by a screw cap 1 and provided with a suction valve 2 at a bottom opening, and a pipe body having a closed lower end opening, and a discharge hole 4 at a lower side wall. A piston guide 7 in which a diameter-expanding tube 5 that fits in the cylinder 3 is diverged from the lower outer surface of the discharge hole 4 and rises upward, and a through-hole 6 is opened in the diameter-expanding tube 5, and the discharge hole is formed. 4 parts piston guide 7 and cylinder 3
A driven type cylindrical piston 8 also serving as a discharge valve arranged so as to be in sliding contact with the piston guide 7 and engaging projections 9 for mutual engagement.
And the engaging recessed groove 10 are engaged with each other to extend upward, and the stem 11 extends upward and outward.
Is a push-down head 14 which is externally fitted and communicated with the upper part of the stem 11, is a pipe body made of a hard material, and has a large projecting bar 15 on the upper part of the outer peripheral surface, and a few small projecting bars 16 on the middle part facing outward. Projecting from the stem 11 to the communication pipe 13 and fitted inside,
16 groups are connected to the inner surface of the stem 11 by digging in, and the large piercing bar 15
Is provided between the upper surface of the screw cap 1 and the lower surface of the push-down head 14 and a movable portion of the connecting pipe 17 in which the connecting pipe 13 and the stem 11 are firmly connected to each other by engaging with the inner surface of the communicating pipe 13. And a return spring (18).