JPH0657452U - Liquid injection device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The return spring is placed in the external space between the upper surface of the screw cap and the lower surface of the pressing head above it to prevent rusting, and the pressing head is used as the spring of the returning spring. To obtain a liquid ejecting device that is attached so that it does not come out by force. [Structure] A return spring 20 is arranged between the upper surface of the screw cap 1 and the lower surface of the pressing head 19, and the communicating pipe 16 and the stem 14 of the pressing head 19 and the stem 14 and the piston guide 10 are engaged with each other. And engaged by engaging the engaging groove.

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 is internally fixed to the neck of a container body by a screw cap 1, has a cylinder 3 formed in a valve seat 2 of a suction valve by inclining and reducing a lower portion, and a lower end thereof is brought into contact with or separated from the valve seat 2. A valve shaft 5 formed on the valve body 4 that is vertically movable on the axial center of the cylinder 3, and a fixed part with a valve stopper 6 that is fixed to the inner wall surface of the cylinder 3 and restricts the rising position of the valve shaft 5. A pipe body, the lower end of which is slidably pressed against the outer surface of the valve shaft 5 and rises upward, and a discharge hole 7 is opened in the lower side wall. The expansion pipe 8 to be fitted is branched, and the expansion pipe 8 is provided with a piston guide 10 having a through hole 9 formed therein, and a piston guide 10 in the discharge hole 7 and the driven pipe 3 are arranged so as to make sliding contact with the cylinder 3. The cylindrical piston 11 and the piston guide 10 are engaged with each other. The protrusion 14 and the engagement groove 13 engage with each other to externally fit the stem 14, which extends upward and outward. The nozzle pipe 15 is projected from one side, and the communication pipe 16 on the lower surface is engaged with the upper part of the stem 14 by mutual engagement. It is composed of a movable portion of the pressing head 19 coupled by the engagement of the protrusion 17 and the engaging groove 18 and a return spring 20 arranged between the upper surface of the screw cap 1 and the lower surface of the pressing head 19. ing.

[0009]

[Action]

 FIG. 1 shows the normal state. In this state, the liquid ejection path system of the movable portion of the push-down head 19, the stem 14, and the piston guide 10 is moved to the upper limit position by the return spring 20 via the push-down head 19. When pushed up, the cylindrical piston 11 also serving as the discharge valve body is in the upper limit position at this position to close the discharge hole 7, that is, close the discharge valve, and the valve shaft 5 is locked to the valve stopper 6 by the piston guide 10. Is pulled up to form a gap with the valve seat 2, that is, the suction valve is in the open state.

In order to eject the liquid, it suffices to push the movable portion downward through the push-down head 19 against the return spring 20. Then, the initial discharge valve 7 descends from the cylindrical piston 11 and opens, that is, the discharge valve opens, and at the same time, the valve shaft 5 is pushed down and the valve body 4 contacts the valve seat 2 to close the suction valve. After that, the cylindrical piston 11 is pushed down into the same body via the lower end of the stem 14 to pressurize the liquid in the cylinder 3, and this pressurized liquid presses the through hole 9, the discharge valve 7, the piston guide at the lower end of the piston guide 10. It is injected from the nozzle tube 15 to the outside through the stem 10 and the stem 14.

When the liquid injection is finished and the pressing is stopped, the movable part rises and returns to the original state by the return spring 20, but in this case, since the piston guide 10 side starts to rise as it is, the tubular piston 11 is immediately tubular. The piston 11 closes the discharge hole 7, that is, the discharge valve is in a closed state, and ascends in this closed state, so that the inside of the cylinder 3 becomes negative pressure. On the other hand, simultaneously with this rising, the valve shaft 5 is pulled up until it engages with the valve stopper 6 and the suction valve opens, so that the cylinder 3 under negative pressure passes through the opened suction valve and moves from a container body not shown. Suck up the liquid and prepare for the next injection.

In this device of the present invention, since the return spring 20 is disposed in the upper outer space between the upper surface of the screw cap 1 and the pressing head 19, it does not come into contact with the injection liquid and rusting can be prevented. Further, in the arrangement of the return spring 20, since the spring force is directly applied to the pressing head 19, the pressing head 19 may come off from the stem 14 or the piston guide 10 without the stem 14. However, the push-down head 19 and the stem 14 are engaged with each other by the engagement projection 17 and the engagement groove 18, and the stem 14 and the piston guide 10 are also engaged with the engagement projection 12 and the engagement groove 13. Since each of them is an engagement connection by, each connection is strong and there is almost no possibility of slipping out.

[0013]

【Example】

 An embodiment will be described below with reference to the drawings. The liquid ejecting apparatus of the present invention comprises a fixed part, a movable part and a return spring.

The fixed portion includes a screw cap 1, a cylinder 3 and a valve shaft 5.

The screw cap 1 has an opening at the center of the top wall, and a holding cylinder 21 having a partial U-shaped cross section is erected on the periphery of the opening, and the holding cylinder 21 is locked to the outer periphery of the upper end from the top. The inner fixed guide peripheral wall 23 provided with the projecting ridges 22 and the outer fixed guide peripheral wall 24 are provided upright from the peripheral edge of the top wall, and the mounting peripheral wall 25 is screwed and attached to the neck portion of the container body (not shown).

The cylinder 3 has a vertical shape, and a lower portion thereof is inclined and reduced in diameter to form a valve seat 2 of a suction valve, and a suction pipe 27 communicates downward from a connecting cylinder 26 below the valve seat 2 and also a valve seat. 2 A cylindrical valve stopper 6 is fixed to the inner wall surface of the intermediate diameter portion immediately above, and the upper portion is inserted and fixed to the holding cylinder 21 and is suspended and installed inside the neck portion of the container body.

The valve shaft 5 has a thick lower half and an upper thin half, and the cylindrical lower end surface is tilted to form this portion as the valve body 4 of the suction valve. The valve stopper 6 has a locking piece 28 projecting in the circumferential direction, which is locked to the lower end of the valve stopper 6. Therefore, the locking piece 28 is arranged so that it can be moved up and down a short distance on the shaft core of the cylinder 3. It forms a suction valve function that opens and closes the seat 2 by opening and closing.

Next, the movable part comprises a piston guide 10, a cylindrical piston 11, a stem 14, and a push-down head 19.

The piston guide 10 is a vertically long pipe body, the lower end of which is slidably press fitted onto the upper portion of the valve shaft 5, and the enlarged diameter pipe 8 which slidably contacts the inner circumference of the cylinder 3 is branched from the lower portion. A through hole 9 is formed in the middle part of the expanded pipe 8 in the circumferential direction, and a vertical through hole 9 is formed, and a discharge hole 7 is formed in the side wall near the lower part. It has been set up in the club.

The cylindrical piston 11, which also serves as a discharge valve body, is slidably arranged between the outer surface of the piston guide 10 and the inner surface of the cylinder 3, and the slidable contact surface is a curved elastic surface. The discharge hole 7 and the intake hole 29 on the cylinder 3 side are closed at the upper limit position.

The stem 14 has a lower half portion which is fitted onto the upper half portion of the piston guide 10 and extends upward, and an engaging projection 12 is projected on the inner periphery of the middle portion, and the engaging projection 12 is engaged with the engaging recess 12. The groove 13 is engaged with the piston guide 10 so as to be firmly engaged with the piston guide 10, and an engaging groove 18 is provided on the outer surface of the upper portion.

The push-down head 19 has a communication pipe 16 at the center of the lower surface, a nozzle pipe 15 communicating with the communication pipe 16 on one side, and a movable-side guide cylinder 30 vertically extending from the peripheral edge thereof. 30 A locking projection 31 is provided on the inner circumference of the lower end, and the projection 31 is engaged with the projection 22 to prevent it from slipping out, and an engaging projection 17 is provided on the inner circumference of the communication pipe 16. 17 is engaged with the engaging groove 18 and is firmly connected to the stem 14. Numeral 32 is a spacing plate which is discontinuous in the circumferential direction.

Next, the return spring 20 is in the form of a coil, and is inserted between the upper surface of the clamping cylinder 21 on the upper surface side of the screw cap 1 and the spacing piece 32 on the lower surface of the pressing head 19 and movable via the pressing head 19. The section is always urged upward.

Here, the protruding edge of the outer surface of the lower end of the stem 14 is locked to the downward step portion 33 of the inner circumference of the holding cylinder 21 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 20 is arranged in the external space between the upper surface of the screw cap 1 and the lower surface of the pressing head 19, and does not come into contact with the stored liquid so that it does not rust, and therefore the spring itself is Problems such as damage and liquid alteration can be solved.

Further, the pressing head 19 and the stem 14, and the connection of the stem 14 and the piston guide 10 are increased by providing a ring-shaped line on one surface as shown by reference numerals 34 and 34 in FIG. Since the connection was due to the added frictional resistance, in the case of the structure of the present invention in which the spring force of the return spring 20 is directly applied to the push-down head 19, the push-down head 19 may come loose due to loose connection. In the present invention, the connection is made by the engagement ridge and the engagement groove, so that the fear can be eliminated.

Of course, in the present invention, the conventional connection by frictional resistance may be used together with the connection between the communication pipe 16 and the stem 14, and between the stem 14 and the piston guide 10.

[0028]

[Effect of device]

 As described above, in the liquid ejection device of the present invention, the return spring 20 is arranged in the external space between the upper surface of the screw cap 1 and the lower surface of the pressing head 19, and the pressing head 19 and the stem 14, the stem 14 and the piston guide. Since the ten couplings have a strong coupling structure with the engagement ridge and the engagement groove respectively, not only can the rusting of the return spring 20 be prevented, but the spring force of the return spring 20 can be directly It is possible to eliminate the risk that the additional push-down head 19 will come off, and improve the reliability of the device.

[Submission date] July 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

[0024] Here, flange of the stem 14 below Tangaimen is a gap between the clamping cylinder inner peripheral 21 downward stepped portion 33 of the screw cap 1, and the piston 11 outer peripheral wall clamping cylinder 21 The upper limit position of the movable part is the state shown in the figure in which the movable part is in contact with and locked to the lower end of the circumference .

[Brief description of drawings]

FIG. 1 is a half longitudinal sectional view of an embodiment.

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

[Explanation of symbols]

 1 Screw cap 10 Piston guide 14 Stem 12,17 Engagement ridge 13,18 Engagement groove 20 Return spring

Claims (1)

[Scope of utility model registration request] 1. A cylinder 3 which is internally fixed to a neck portion of a container body by a screw cap 1 and whose lower portion is inclined and reduced to form a valve seat 2 of a suction valve, and a lower end of which is brought into contact with and separated from the valve seat 2. 4, a valve shaft 5 which is vertically movable in the axial center of the cylinder 3, a fixed portion with a valve stopper 6 which is fixed to the inner wall surface of the cylinder 3 and restricts the rising position of the valve shaft 5, and a pipe body. In addition, the lower end is slidably pressed against the outer surface of the valve shaft 5 and rises upward, a discharge hole 7 is opened in the lower side wall, and a diameter-expanding pipe 8 is fitted into the cylinder 3 from the lower outer surface of the discharge hole 7. A piston guide 10 in which a through hole 9 is opened in the expanded pipe 8; a driven cylindrical piston 11 arranged so as to be slidably contacted between the piston guide 10 in the discharge hole 7 and the cylinder 3; On the guide 10, the engaging protrusion 12 and the engaging groove 13 The stem 14 which is fitted and coupled to the outside by the engagement of the above, and the nozzle pipe 15 is projected from one side, and the communication pipe 16 on the lower surface is provided on the upper part of the stem 14 with the engaging projection 17 and the engaging groove 18. A liquid ejecting apparatus comprising a movable portion with a pressing head 19 which is coupled by the engagement with a return spring 20 disposed between the upper surface of the screw cap 1 and the lower surface of the pressing head 19.