JPH0441943Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Purpose of the invention) This invention is a so-called metered injection container that quantitatively releases the propellant contained in the container under pressure each time it is operated. The purpose is to provide a product that can pressure-fill materials, has accurate quantitative properties during injection, and has low production costs.

This inventor previously published in Japanese Patent Publication No. 51-31963 a quantitative injection container that can be pressure-filled with an injection material through an injection valve.

The above-mentioned known metering injection container is a so-called metering injection container that is already well-known, with a replenishment valve for replenishing the injection material from the main body of the container to the metering chamber, as shown in Fig. 5. It is something. That is, the replenishment valve includes a protrusion plug 57 provided at the lower end of the valve stem 5a, and a valve hole 82 bored in the top wall 81 of the elastic floating cylinder 8 which is disposed below the valve stem 5a and is pivotally inserted into the coaxial passage 35a. It is made up of. Also,
The outer circumferential surface of the skirt tube 83 of the elastic floating tube 8 and the inner circumferential surface of the passage 35a constitute a filling valve.

Therefore, when the valve stem 5a is at rest as shown in FIG. While the injection valve constituted by the valve hole 52a and the elastic gasket 2a is closed, the protrusion plug 57 at the lower end of the valve stem 5a and the valve hole 8
Since the supply valve consisting of 2 and 2 is open,
The injection material in the container body passes through the replenishment valve to the metering chamber 3.
1a, and at this time, the pressures in the metering chamber 31a and in the container body are in an equal pressure relationship.

Therefore, when the valve stem 5a is pushed down, the protrusion plug 57 closes the valve hole 82, thereby closing the replenishment valve and opening the injection valve.
The propellant stored in a is discharged and is transferred to the metering chamber 3.
1a is reduced in pressure.

At this time, the valve hole 82 should be closed by engagement with the protrusion plug 57, but when the pressure in the metering chamber 31a is reduced, the inner circumferential surface of the hem tube 83 of the elastic floating tube 8 and the top wall 81 Since the lower surface of the valve hole 82 is directly affected by the pressure of the injected material in the passage 35a, the tendency of the valve hole 82 to enlarge is unavoidable. Then, as the valve hole 82 expands, the ejected material other than the fixed amount enters the fixed amount chamber through a gap generated between the protrusion plug 57 and the hole wall of the valve hole 82 . The amount of intrusion of such non-quantified propellant is the valve stem 5.
It is not constant each time the operation is performed, depending on the operation speed of a, operation time, etc.

(Structure of the device) This device can completely solve the above-mentioned problem of insufficient metering in a metered injection container that can be filled with pressure. This idea will be explained below.

That is, according to this invention, 31 is the valve case 3,
The metering chamber is formed by the cylindrical wall 3' and is located in the middle of the injection passage connecting the injection material under pressure in the closed container and the injection port.

Regarding the above-mentioned closed container, only the mountain caps 1, 1' are shown. Further, the injection ports described above are similar to those indicated by the reference numeral 11 in FIG.

According to this invention, an injection valve is provided at the upper end of the metering chamber 31, which opens when the valve stem 5 descends and closes when it rises. Furthermore, a replenishment valve is provided at the lower end of the metering chamber 31, which closes when the valve stem 5 descends and opens when it rises.

That is, in the illustrated example, the injection valve described above is formed by the valve hole 52 in the hollow portion 51 of the valve rod 5 and the elastic gasket 2. Details of the above-mentioned replenishment valve will be described later.

According to this invention, like the known metering injection container, the injection material stored in the metering chamber 31 through the replenishment valve is injected through the injection valve by pushing down the valve stem 5.

Further, according to this invention, reference numeral 6 denotes a soft elastic stopper having a hem tube 61, and a head 62 is connected to the base 54 of the valve stem 5.
It is fixed in place. Further, 35 is a passage having a smaller diameter than the skirt tube 61 of the stopper 6.

According to this invention, the replenishment valve described above is made up of the peripheral surface of the skirt tube 61 and the cylindrical surface 33 of the passage 35.

In the illustrated example, 53 is a window hole bored in the base 54 of the valve stem 5 for the purpose of expanding the volume of the metering chamber 31;
In particular, as can be seen from Fig. 2, the ceiling surface 55 is
By designing it to be high as shown by or low as shown by b, the volume of the metering chamber 31 can be changed as required while keeping the shape and dimensions of the valve housings 3, 3' constant. be. Note that 56 is a shaft hole for fitting the head 62 of the plug, and 63 is the head end of the plug, which protrudes and widens above the shaft hole 56 when the plug 6 is fitted to ensure secure fitting. It is set as.
32 is a replenishment port from the liquid suction pipe 7 to the metering chamber 31.

Since this device is constructed as described above, when the valve stem 5 is pressed down by connecting to the top end of the injector, the above-mentioned injection valve opens, while the above-mentioned replenishment valve closes. When the discharge of the filling injection under pressure is started from the filling nozzle (not shown), the injection passes through the injection valve and first fills the metering chamber 31, and then as the pressure of the metering chamber 31 increases, it fills the third chamber. As shown in the figure, the bottom tube 6 of the stopper
1 is deformed inwardly, and at this time, the propellant is filled into the container through the gap formed between the skirt tube 61 and the cylindrical surface 33 of the passage 35.

After filling is completed, insert the above-mentioned filling nozzle into the valve stem 5.
When removed from the valve stem 5, the valve stem 5 rises due to the thrust of the spring 4, and the plug body 6 rises accordingly, returning to the stationary state shown in FIG. 1 again.

Next, when injecting, when the valve stem 5 is pushed down, the circumferential surface of the skirt cylinder 61 engages with the cylindrical surface 33 of the passage 35 due to the lowering of the stopper 6, thereby closing the replenishment valve and opening the replenishment valve. Therefore, the injection material filling the metering chamber 31 is discharged through the injection valve.

When the pressure in the metering chamber 31 decreases due to the discharge of the propellant, the pressure difference between the metering chamber 31 and the container body increases, so the pressure applied to the inner surface of the skirt tube 61 increases, but in this case, the pressure applied to the inner surface of the skirt tube 61 increases. Since the closeness of the skirt cylinder 61 to the cylinder surface 33 of 35 becomes stronger and stronger, and there is no room for any other gap to occur in the relationship between the metering chamber 31 and the passage 35, no leakage of the ejected material from the replenishment valve occurs. . Even if the stopper 6 swells due to long-term use, the effect of preventing leakage is still complete.

In this way, the leakage prevention effect of the injection material in the replenishment valve is perfect, so the amount of injection material discharged from the metering chamber 31 is always a constant amount, and its quantification is always accurate.

(Effects of the invention) That is, according to this invention, not only is it possible to fill the injection container with the injection through the injection valve, but also the quantity of the ejected injection is accurate. Furthermore, according to this invention, in the known injection container shown in FIG. The intermediate cylinder 34 for supporting the spring 4a is also completely unnecessary, so the number of parts is small.
Therefore, the cost of parts management and assembly man-hours is low, and it is extremely advantageous for mass production, and the effects of improving the performance and mass productivity of the pressure-filled metered injection container are extremely significant.

[Brief explanation of the drawing]

Fig. 1 is a side view of the two embodiments of this invention at rest with axial cross-sectional half-sections, Fig. 2 is a front view of the valve pedicle, and Fig. 3 is a side view of the main part during filling. FIG. 4 is an axial half-section side view of the stopper, and FIG. 5 is an axial sectional side view of the known pressure-filled metered injection container at rest. 1 and 1' are mountain caps, 2 and 2a are elastic gaskets, 3 and 3' are valve housings, 31 and 31a are metering chambers, 32 is a supply port, 33 is a cylinder surface, 34 is an intermediate cylinder, and 35 and 35a are passages. , 4, 4a, 41 are springs, 5, 5a are valve stems, 51 are hollow parts, 52, 52
a is a valve hole, 53 is a window hole, 54 is a base, 55 is a ceiling surface, 56 is a shaft hole, 57 is a projecting plug, 6 is a plug body, 61 is a skirt tube, 62 is a head, 63 is a head end, 7 is a liquid suction tube, 8
81 is a top wall, 82 is a valve hole, and 83 is a skirt tube.

Claims (1)

[Scope of utility model registration request] A metering chamber 31 is formed by the cylindrical walls of the valve housings 3 and 3' in the middle of the injection passage connecting the injection material under pressure and the injection port in the closed container, and the upper end of this metering chamber receives the thrust of the spring 4. An injection valve that opens when the valve stem 5 descends and closes when it rises is provided at the lower end of the metering chamber, and a replenishment valve that closes when the valve stem descends and opens when it rises. In the quantitative injection container which injects through the injection valve by pressing down the valve stem, the replenishment valve has a skirt cylinder 61 and a soft elastic head 62 fitted in the base 54 of the valve stem. A pressure-filled fixed-quantity injection container comprising a circumferential surface of the skirt tube of the stopper 6 and a cylindrical surface 33 of a passage 35 connected below the metering chamber and having a smaller diameter than the skirt tube.