JPH02214556A - Manual pressurization type spray head - Google Patents

Abstract

PURPOSE: To obtain such a spray head capable of easily injecting a propellant gas of the amt. sufficient to prevent the entry of air into a container until the whole of fluid is discharged after filling of the fluid into the container. CONSTITUTION: A first cylinder 11 forming the pump chamber of the spray head is integral with a pump outlet valve 15 and the end thereof is provided with a circular sealing piece 12 which engages with the wall of a second cylinder 15 forming the pump chamber together with the first cylinder and is slidable along this wall. The second cylinder 15 communicates with the inside of the container and the wall of the second cylinder is provided with a relief part of a considerably large size at least at one of both ends of the wall. A passage is formed in such a manner that the propellant gas is passed at a velocity of flow sufficient for filling the gas into the container when the sealing piece 12 comes above the relief part to release the sealing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a manual preload spray head used for atomizing a liquid contained in a container, and more particularly to a manual preload spray head that prevents said liquid from coming into contact with outside air. It also relates to a spray head for use in a container containing a liquid under pressure with a propellant gas, in order to facilitate the preparation of the pump and to fill the pump chamber more quickly and completely. Here, the propellant gas must be something that does not dissolve, such as nitrogen, since freon and the like dissolve in the liquid.

C. Prior Art] A conventional pump includes a pump chamber consisting of a telescoping, slidable first and second cylinder, and the pump chamber is sealed by relative displacement between the first and second cylinders. The first cylinder is integral with the pump outlet valve, and is provided with a circular sealing piece at one of its ends. This sealing piece is
It can engage and slide along the wall of the second cylinder.

The second cylinder communicates with the interior of the container. If the first and second cylinders have opposite edges separated from each other at a certain distance, a gap between the edges provides communication between the pump chamber and the interior of the container. When one of the cylinders is engaged inside the other cylinder, communication through the gap is blocked and the pump chambers are isolated, thereby forming an annular pump chamber surrounding both cylinders. Such pumps are described, for example, in French patents 2,305,241 and 2,314,772 and the corresponding US patent 4,025,046.

[Problems to be Solved by the Invention] The pump disclosed in the above patent does not use propellant gas. These pumps can also be used with propellant gas by ensuring that the communication with the outside air is severed. The liquid discharged by the pump is then not replaced by air. However, in this case, the problem was that the propellant gas was injected into the container after the container was filled with liquid and the pump was installed and prepared in the container.

The object of the present invention is to make it possible to reliably and easily fill a cavity in a container with propellant gas.

French Patent No. 2,407,752 discloses a pre-pressure pump for atomizing liquid, but does not provide a device for receiving pressurized gas to prevent the inflow of air to replace the ejected liquid. With conventional pumps like this,
As with the other pumps mentioned above, the outlet valve opens only when the pressure in the pump chamber reaches a certain value. When the pump is ready to start, the pump chamber is filled with liquid.

When the volume of the pump chamber is reduced, the pressure rises to a high value very quickly since the liquid is incompressible.

The valve member therefore rises and liquid is injected. However, when the pump is used for the first time, the pump chamber is filled with air, so even if the volume of the pump chamber is reduced, the gas pressure only increases relatively slightly and the valve member does not rise. Air stagnates in the pump chamber, making it difficult to prepare for starting the pump for the first time. The pump of the French patent has means for facilitating or enabling the preparation for starting.

For this purpose, the second cylinder is provided with a notch or projection which allows communication between the pump chamber and the interior of the container when the pump is operated to its maximum limit. The passageway is then at a level separate from the sealing piece. The cross-sectional area of these passages is extremely small.

These passages only allow air to escape from the pump chamber. Of course, the pump position required for air evacuation must be determined by normal manual operation of the pump.

[Means for Solving the Problems] The present invention allows for easy injection of gas into a container in an amount sufficient to prevent air from entering the container after filling with a fluid until all of this liquid has been discharged. Do it like this.

According to the present invention, the second cylinder communicating with the interior of the container is provided with a relief portion at at least one of its ends, and the dimensions of the second cylinder are such that when the sealing piece of the first cylinder is at the same level as the relief portion. , large enough to allow gas flow to pass easily through it at high speeds.

In a first embodiment according to the invention, a relief is provided in the form of a groove or a notch formed in the edge of the end of the second cylinder furthest from the container, i.e. the end closest to the pump outlet valve. ing. These notches are long enough to provide sufficient passage for the injected gas when the sealing piece of the first cylinder is over the notch, i.e. when the pump valve member is pushed in to inject sufficient gas. It has a certain quality. The notch then extends considerably beyond the sealing piece of the first cylinder, even though it is displaced simultaneously with the valve member, since the sealing piece is forced to move together with the valve member.

In a second embodiment according to the invention, the second cylinder end adjacent to the container, i.e. the second
A relief portion is formed at the end of the cylinder.

Advantageously, the recess is formed with at least one projecting rib, which projects sufficiently long so that the sealing piece of the first cylinder cannot pass through it using manual pressure alone.

In order to pass the sealing strip over the ribs, it is necessary to apply a thrust by the filler.

In this case, the normal operation of the pump is not disturbed by unsealing the sealing piece.

In the first and second embodiments described above, the valve member may be pushed in by the needle and the valve may be opened by the filler. The valve member is not made to stop at a point, as is conventional practice, but is provided with a central flat or small, indentation at the end of the valve member to receive the needle. The sealing action of the valve member takes place in the cone of the surface surrounding this depression. The needle is pushed in until the sealing piece of the first cylinder is level with the relief of the second cylinder.

The propellant gas then flows into the container. Depending on which end of the second cylinder the relief is located, the relative position of the two cylinders during filling corresponds to the beginning or end of the pump stroke.

If the relief part of the second cylinder is placed in such a position that the seal is broken at the beginning of the pump stroke, the spray head will be easier to implement, but the sealing of the pump chamber will be delayed during normal use. , the pump capacity will be reduced.

[Operation] A pump equipped with a spray head according to the invention operates in a known manner, except for the parts that depend on the invention.

A sealing piece is provided at one end of the first cylinder forming a pump chamber, and a relief section consisting of a groove, notch, rib, etc. is provided at at least one end of the second cylinder, and by relative displacement of both cylinders, When the sealing piece and the relief part are on the same level and facing each other, a passage is formed between them that provides a flow velocity sufficient to fill the container with propellant gas.

[Example] An example of the present invention will be described with reference to the drawings. 1st
, 2 are cross-sectional views of a preload pump showing a first embodiment of the present invention. The pump is adapted to be received in the opening of the container. The pump has a pump body 1, the upper end of which is mounted within a capsule 2, which capsule 2 is adapted to be mounted in the neck of a container (not shown) with a suitable insert sealing ring. . A collar 4 is provided at the bottom of the pump body 1, and a dip tube 5 engages inside or outside this collar. The piston 6 is slidable within the vent body and is integral with a rod 7 that projects outside the pump. The injection passage 8 is provided so as to pass through the rod 7 and the piston 6. Rod 7 to piston 6
A push button (not shown) is attached to the upper end of the rod 7 for pressing down together. The injection channel 8 is conventionally formed with a valve seat 9, which engages with a valve member constituted by a pin 10. The pin 10 is integrated with a first cylinder 11 having a sealing piece 12 at its lower end. The valve member is forced upwardly by a spring 13 into its sealing position. The lower end of the spring 13 abuts the bottom of the pump body.

The first cylinder 11 is movable downward along a second cylinder 15 fixed to the bottom of the pump body l. In the resting state, the valve member is pushed upwards by the spring 13, driving the piston 6 upwards until it reaches its abutment position and the valve remains sealed. In the stationary state shown in Fig. 1, the first and second
The cylinders are separated from each other and define an annular passage between them, allowing the pump chamber to be filled both by suction and by the action of propellant gas. When the piston is pressed down, the sealing piece 12 abuts around the second cylinder 15, thereby closing the annular passage and creating an annular pump chamber between the pump body l and the first and second cylinders 11.15. stipulate. As the piston continues to move downward,
As the volume of the pump chamber decreases, the liquid in the chamber is compressed until the pressure is in equilibrium with the spring 13, thereby moving the valve member 10 downwards together with the cylinder 11, and the sealing piece 12 moves along the second cylinder. and slide.

Liquid can then be ejected via the injection channel 8 as long as the pressure in the pump chamber is greater than the pressure due to the action of the spring 13. The above description is conventional, and the pump constitutes one of the embodiments shown in the above patent. The invention is applicable to all of the embodiments of the above patents.

In one embodiment of the invention shown in FIGS. 1 and 2,
A relief section made of ribs 18 is formed around the bottom of the second cylinder 15 at the bottom of the pump chamber. While the sealing piece 12 is in contact with the outer surface of the second cylinder 15 above the rib 8, a sealing action is performed, the pump chamber is sealed, and the liquid in the pump chamber is removed from the valve seat. You can just squirt. However, if the valve body is pushed down, for example by needle 31 (see FIG. 3), until the sealing piece engages rib 18 (see FIG. 2), the seal is released. In this position, when the valve member is lifted from the valve seat on the piston, pressurized gas can be injected into the container via the injection channel 8. To facilitate this operation, a small indentation 10 is made in the center of the bottle.
a to automatically center the needle 31 and prevent it from deflecting laterally. It is preferable to provide a recess, but a small flat surface may also be used.

Instead of providing the rib 18 in the relief part, a hollow groove can also be provided. The advantage of the ribs is that they have a thick wall that prevents the valve member from moving downwards under the action of manual pressure, which, by enlarging the sealing piece 12,
Usually, there is not enough force to press the sealing piece 12 against the thick wall. Then, at the end of the downward stroke, ie after ejecting a certain amount of liquid, the user cannot accidentally break the seal. For that purpose, the filling device for filling the can with propellant gas may be provided with means by which the sealing piece can be elastically expanded around the ribs 18.

In order to ensure proper operation of the pump in all environments during charging with propellant gas and during normal operation, means may be provided to prevent the passageway from becoming unintentionally blocked.

Therefore, when the first cylinder is fully depressed, the rib 18 has a 90" extension 18a at the bottom of the pump chamber in order to prevent the passage from being blocked by the bottom edge of the first cylinder pressed against the bottom of the pump chamber. In order to guide the valve member against the inner wall of the pump body without blocking the passage, it is advantageous to provide the valve member with guide ribs 19.

In order to keep the passage between the bottle and the interior always open, a rib 20 can also be provided at the top of the large diameter part of the valve member between the first cylinder 11 and the rod of the bottle (see FIG. 2). Finally, a rib 21 is provided at the bottom of the first cylinder 11 to prevent the passage from being blocked by the upper edge of the second cylinder when the first cylinder is pressed down sufficiently (see Figure 2). .

During normal use, the user must avoid moving the valve member to the lowest position of the valve member, which is at the same level as the sealing piece 12 and the bar 18 (e.g., if the user presses the push button too hard). or when the relief portion is constructed with a hollowed-out rib), a means for limiting the stroke of the piston can be provided. In the embodiment shown in FIGS. 1 and 2, a step 22 is provided on the inner wall of the pump body. This positively limits the downward stroke of the piston, and therefore the downward stroke of the valve member, to the desired level. FIG. 2 shows the spring fully compressed and the valve member in its lowest position.

In the embodiment shown in FIG. 3, the relief portion of the second cylinder 15 is located at the end of the second cylinder 15 that is closest to the first cylinder in its rest position (see FIG. 3). is formed. The relief shown in FIG. 3 is formed by a groove 32. Further, the relief portion may be formed by the cutout portion 25 (
(See Figure 4 for details). These grooves or cutouts must have a cross-sectional area large enough to allow gas to flow at high velocity.

In order to fill the can with propellant gas, the piston is lowered by lowering the valve member using the needle 31 (see the left half in FIG. 3) so that the sealing piece 12 is halfway along the groove 32. without lowering it while keeping it in its highest position.
Raising the pin from the valve seat 9 opens the passage. The cross-sectional area of the groove or cutout must be large enough so that the gas filling rate is sufficient. To fill the container with gas, the valve must be opened and the valve member 10 lowered approximately one inch. In order to flow the appropriate amount of gas,
Since the sealing piece is lowered by 1 mm from its rest position, the groove must extend below the sealing piece. Assuming that there is a gap between the ends of the first and second cylinders in the rest position, the groove must have a practical length of 1.5 m.

This dimension is independent of pump size and volume.

The 1.5 mm criterion is therefore essentially applicable irrespective of pumps having a stroke of 5 mm or 10 mm, typically 7 II m. This is a function of the gap between the opposite ends of both cylinders and the thickness of the sealing piece in the rest position. Therefore, for pump housings of sizes conventionally used for perfumes, pharmaceuticals, etc., the length of the groove must be at least 1.5 mm. Although this embodiment is simpler to manufacture, it has the disadvantage that the effective stroke of the pump is reduced by a distance equal to the effective height of the groove 32 or cutout 25. As a variant, it is also possible to provide outwardly projecting ribs. However, this creates resistance that must be overcome early in the piston stroke under normal use conditions.

The pump according to the invention can be made inverted for use (see FIG. 5). In this embodiment, liquid product enters the pump body through a side opening 40 located above the pump chamber. The bottom of the pump body is closed. In particular, no collar is provided to connect the immersion pipes. In order to use as much liquid product as possible, i.e. to recover the amount of liquid product that is below the level of the side opening 40 when the pump (and the attached container) is inverted, Upward cup 4 extending close to the capsule
1 (faces downward when upside down) is provided on the pump body.

[Effects of the Invention] As described above, the spray head according to the present invention quickly and easily injects the propellant gas for spraying the liquid into atomized form by preventing the liquid in the pump chamber from coming into contact with the outside air. can be done.

[Brief explanation of the drawing]

FIG. 1 is an axial cross-sectional view of a preload pump in a stationary state showing a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of essential parts of the pump shown in FIG. 1 at a filling position, and FIG. , an axial split cross-sectional view showing a second embodiment of the present invention; the right side shows the pump in a stationary state, and the left side shows the pump when propellant gas is injected; FIG. 4 is a diagram showing the pump shown in FIG. FIG. 5 is a partially enlarged cross-sectional view showing a modified example. FIG. 5 is a cross-sectional view showing a state in which the pump according to the embodiment of the present invention is used in an overturned position. 10... Valve member 10g... Dent 11... First cylinder 12... Sealing piece 15... ...Second cylinder 18...Rib 22...Stroke limiting step 25...
・・・・・・Notch part 32 ・・・・・・Groove part

Claims (6)

[Claims] (1) A first cylinder (11) and a second cylinder (15) that are used for containers that contain liquid under pressure due to propellant gas and into which the liquid can be injected without coming into contact with air, and that can be slidably engaged. In the manual preload pump type spray head, which forms a pump chamber that is sealed by the relative displacement of these cylinders, the first cylinder (11) is integral with the pump outlet valve, and one end of the cylinder is integral with the pump outlet valve. is provided with a circular sealing piece (12) capable of engaging and sliding along the wall of said second cylinder (15), said second cylinder (15)
The cylinder communicates with the interior of the container, and the wall of the second cylinder is provided with a relief portion having a considerable size at at least one of both ends of the wall, and the sealing piece is connected to the relief portion of the relief portion. A manually preloaded spray head forming a passageway for passage of propellant gas at a flow rate sufficient to fill the container with the propellant gas once the seal is lifted upwards. (2) The relief part is constituted by a groove part (32) or a notch part (25) formed at the end of the second cylinder far from the container, and the notch part is formed by the sealing piece (12) of the first cylinder. is at the same level as the recess, i.e. the pump valve member (10) is pushed back in order to allow a sufficient inflow of filling gas, and at the same time the recess is moved together with the valve member. At least 1.5 m in order to provide sufficient passage for gas filling when the displacing first cylinder (11) extends considerably beyond the sealing piece.
A spray head according to claim 1, having a length of m. (3) The relief part forms at least one protruding rib (18) at the end of the second cylinder closest to the container, and the first
When the sealing piece (12) of the cylinder (11) only applies manual pressure, it protrudes sufficiently large so that it does not pass through the protruding rib, but the sealing piece (12) protrudes from the rib due to the thrust from the filling device. 2. The spray head of claim 1, wherein the spray head is adapted to be able to pass through the spray head. (4) The spray head according to claim 2 or 3, wherein one end of the valve member (10) has a flat portion or a recess (10a) formed in the center thereof. (5) The spray head according to claim 3, further comprising means for limiting the piston stroke. (6) A spray head according to claim 5, wherein the means for limiting the piston stroke is constituted by a peripheral step (22) provided on the inner wall of the pump body.