JPH05213381A - Delivery device - Google Patents

Abstract

PURPOSE: To maintain a consistent delivery volume flow of a product without relation with the filling rate in a spray nozzle under pressurized condition with a gas not dissolving into the product, by installing a throttle valve structure in a product path in the direction of flow of the product and upper stream side of the delivery valve. CONSTITUTION: A delivery device (1) for spray cans (2) filled with a product, which is capable of flowing and which is under gas pressure, is provided with a product path (14), which is closable by a delivery valve (5) and has a throttle nozzle arrangement (11). The throttle nozzle arrangement (11) is provided with an inlet duct, which is arranged in a plane extending perpendicularly to the axial direction. On the other hand, the inlet duct is opened in tangential direction and provided with an outlet duct (22) extending to the axial direction. In this case, the throttle nozzle arrangement (11) is arranged inside the product path (14) in the direction of flow the product and at the upper stream of the outlet valve (5). By this, the discharge volume flow of the product is maintained consistent without relation with the filling rate in the spray nozzle under pressurized condition with a gas not dissolving into the product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a product path which can be closed by a delivery valve and which is provided with a throttle nozzle structure, in the plane of which the inlet side extends orthogonally to the axial direction. At least one inlet duct substantially disposed on the outlet side, and on the outlet side there is provided a substantially axially extending outlet duct in which the inlet duct opens substantially tangentially so as to allow a flow and a source of gas pressure. And a delivery device for a product-filled spray can.

[0002] Such a delivery device is EP0,420,
Known from 538Al. In this construction, the squeeze nozzle construction simultaneously forms a delivery nozzle through which the product exits the spray can and enters the environment where it is atomized or atomized. Known delivery nozzles, in particular, are such that the product and the product gas are substantially separated from one another in a common space inside the spray can, i.e. the gas does not dissolve in the product at all or is negligible in the product. Used when it does not dissolve. In such a case, the gas pressure decreases as the extent to which the gas pressure in the spray can increases. However, as the pressure decreases, the volumetric flow rate of the delivered product also usually decreases, changing the size of the droplets of the atomized product. This disadvantageous phenomenon can be reduced by the known throttle nozzle structure. The volumetric flow rate and drop size remain substantially constant as the pressure decreases as the emptiness of the spray increases.

In the known delivery device, the squeezing nozzle structure as the last squeezing means in the product path produces the strongest squeezing action with respect to the discharged product. The flow cross section of this throttle nozzle is smaller than the cross section of the preceding throttle means. Correspondingly there is also a maximum pressure drop across the delivery nozzle. In this case, fine adjustment of the delivery volume flow becomes extremely difficult. If the throttling resistance chosen is too large, then effective atomization of the product can no longer be ensured. If this resistance is too low, it can no longer be guaranteed that the volume flow is constant. Furthermore, it is very difficult to continue the operation of known delivery devices of the same nature after interruption of the delivery of this product, especially when treating resin-treated or tacky products which are cured by components in the air, for example oxygen. Generally, this throttle nozzle structure becomes clogged.

The present invention is simple to make and has better controllability for delivery volume flow.
based on the problem of providing a resulting delivery device.

With a delivery device such as the one mentioned at the beginning of this specification, the problem according to the invention is that the throttle nozzle structure is located in the product path upstream of the delivery valve in the direction of flow. It is solved by placing it in.

This structure is not only limited to the fact that the throttle nozzle structure is substantially shielded from the atmosphere, and that the constituents in this atmosphere are therefore not able to be included in the chemical treatment by the product. In this case, the throttle nozzle structure is clogged. This structure also allows much better control of the volume flow. Approximately 0.55 g / sec when known
The initial product flow, which can be reduced to about 0.3 g / sec with the delivery device according to the invention, and its value is kept above the whole procedure of emptying the spray can by slight changes. To be able to. Furthermore, the production of such a delivery device is substantially easy. The throttle nozzle structure can be mounted in the product path in a somewhat self-holding manner.

In the preferred embodiment, an expansion space is provided between the throttle nozzle structure and the delivery valve. The product flow rate in this expansion space is substantially reduced not only by the product being throttled by the inlet duct which opens tangentially to the outlet duct, but also by the swirling throttle nozzle structure. In this case, due to the special construction of the throttle nozzle structure, the flow rate is substantially less dependent on the pressure difference across the throttle nozzle structure than in the case of a simple throttle. Following expansion in the expansion chamber, a new throttling action occurs on the delivery valve. A further expansion effect and subsequently a further squeezing effect are appropriately produced by the discharge nozzle. It has been found that when expansion occurs in this way, the volume flow downstream of the throttle nozzle structure can be made more independent of the pressure in the spray can than in the previous case. The product discharge or volume flow is largely determined by the configuration and size of the throttle nozzle structure.

In this case, it is advantageous to change the size of the expansion space when operating the delivery valve, in particular to reduce it. In this way, the product flow can be controlled with even higher sensitivity. The delivery valve can be opened generally or large or small, creating different pressure conditions in the expansion chamber which also depend on the volumetric flow rate of the discharged product. Such a change in pressure condition is partially compensated by a change in the size of the expansion space. Of course, total compensation is not desirable, since opening the delivery valve to different degrees means trying to obtain different values of the product release rate.

Advantageously, the cross-section of the inlet duct is reduced in the area of the mouth opening into the outlet duct. This reduction in cross section results in acceleration of the product flowing through the throttle nozzle structure at the precise moment when the product enters the outlet duct. The tangential inflow creates a swirling turbulence in the outlet duct. The larger the inflow rate, the stronger the swirling turbulence action.

The invariance of the volumetric flow strongly depends on the strength of the turbulent turbulence action, and the higher the swirling turbulence action, the better. Therefore, the reduction of the cross-section further keeps the volume flow constant.

In this case, it is particularly advantageous if the cross section of the inlet duct is constantly reduced towards the outlet duct. This structure accelerates the product relatively uniformly.

The best results are obtained by providing a plurality of, especially two or three, rotationally symmetrically distributed inlet ducts. This arrangement ensures that a sufficient amount of product can flow into the outlet duct. This arrangement also ensures that this amount of product vortex turbulence is very regularly received.

The throttle nozzle structure comprises an insert member having an outlet duct fitted and penetrating in the product channel and an inlet duct at least partially open on the inlet side and mounted on an engagement body in the product channel. The engagement body covers the outlet duct on the inlet side to expose a part of the inlet duct. The throttle nozzle structure is thus substantially formed by two parts, the insert and the engaging body. Also, the product is not allowed to flow freely through the exit duct. The product, on the other hand, partly leaks and flows tangentially into the outlet duct through the inlet duct with a swirling turbulence. The manufacture of the delivery device is extremely simple due to the separate inserts.

Also, at least in the area of the insert, the product duct may have a circular cross section or a regular polygonal cross section, and the cross section of the insert may match the cross section of the product duct.
Therefore, the insertion member can be inserted at virtually any angular position. It is not necessary to pay attention to the specific insertion direction.

The insert member may have a disc arranged in the hollow cylinder including the inlet duct and the outlet duct, arranged substantially perpendicular to the axis of the product duct. The insert therefore has an H-shaped cross section. In this case, the horizontal bars of this H represent a disc and the four legs of this H represent the walls of a hollow cylinder.
The insert can obtain a good sealing action in the product duct without the need for expensive means. The product is allowed to flow through a squeeze nozzle such that it cannot flow past its sides. The manufacture of such an insert is extremely simple.

This is especially the case when the disk is partitioned by two flat surfaces which are substantially parallel to each other.

The hollow cylinder is preferably expanded into a conical shape on the outlet side. This has no positive effect on the product flow characteristics as it exits the exit duct. The conical shape also ensures that the return spring is guided laterally and aligned with the insert.

On the outlet side, the disk may also be provided with a groove or bar portion which extends radially outwardly from the outlet duct and which leads to an axial groove or axial bar portion provided on the inner wall of the hollow cylinder. The actuating member of the outlet valve ensures that product flow occurs even if it is pushed so that it hits the disc. A suitable channel is formed by the groove of the disc and the axial groove of the inner wall of the cylinder, or by the interspace between the bar portions of the disc or between the axial bar portions of the inner wall of the hollow cylinder. When using axial bar portions, it is sufficient to expand the space along the diameter bounded by each axial bar portion into a conical shape.

The wall thickness of the hollow cylinder is advantageously substantially constant in the region of the axial grooves or in the region between the axial bar portions. The depth of the axial groove or the thickness of the axial bar portion is thus reduced in the direction towards the outside of the insert. In this case, a progressive transition takes place from the axial groove into the expansion space with respect to the outwardly flowing product. For this purpose, the hollow cylinder at the end closer to the outlet should have a corresponding wall thickness in the region of the axial grooves or in the region between the axial bar portions. That is, a smooth surface is provided that allows the product to flow into the expansion space directly at the edge of the hollow cylinder.

The length of the hollow cylinder should be at least equal to its radius. In this case, the product duct ensures a sufficient stability with respect to the hollow cylinder. Tilt or twist of the insert during assembly is substantially eliminated.

Another advantage is that the outlet duct comprises a smaller diameter portion and a larger diameter portion at which the inlet duct opens. By changing the lengths of these two parts, a relatively precise adjustment of the volume flow magnitude can be achieved. The shape of the rest of the insert does not have to change. Therefore, manufacturing is extremely simple. It is only necessary to replace each part of the injection mold, but not the whole mold.

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENT The delivery device 1 is located at the top 2 of a spray can (not shown). The delivery device 1 has a housing 3 arranged such that the valve member 4 of the delivery valve 5 can be moved against the force of a return spring 6. The delivery valve 5 closes or opens the product path 14 when activated. The valve member 4 has one or more lateral ducts 7. When the return spring 6 moves the valve member 4 to the rest position 8 shown, each lateral duct 7 is closed by a sealing body. When the valve member 4 is pushed against the force of the return spring 6 into the housing 3, each lateral duct 7 opens in the housing 3 in an annular space 9 surrounding the valve member 4.
The annular space 9 opens into an expansion space 10 partitioned on the opposite side by a throttle nozzle structure 11. Aperture nozzle structure 11
Has an insert member 12 applied to an engagement body 13. The engagement body 13 is provided in the product duct 14 and is connected to the wall of the product duct 14 by, for example, one or more bar portions 15. On the inlet side at the end of the product duct 14, a riser pipe 16 that can supply the product duct 14 from a spray can is arranged. A protrusion 29 extending in the peripheral direction is provided in the product duct 14. The insertion member 12 is fixed to the rear of the protrusion 29. The protrusion 29 may also be interrupted. The insertion member 12 is clamped at a position between the protrusion 29 and the engagement body 13.

The product in the spray can is under the pressure of a gas that does not dissolve in the product. As the spray can gradually becomes empty, the space available for gas becomes progressively larger. Therefore, the gas pressure decreases. The throttle nozzle structure 11 arranged in the product duct 14, in particular in cooperation with the expansion space 10, makes it possible to keep the volume flow of the product at least approximately constant despite the reduction of the gas pressure in the container, ie The delivery ratio is made to be almost independent of the condition that the can is empty.

The insert 12 of the throttle nozzle structure 11 has an H-shaped cross section, the H-shaped horizontal bar being formed by a disc 17 arranged in a hollow cylinder 18. Disk 17
It is delimited by two flat surfaces 19, 20 extending substantially parallel to each other. The hollow cylinder 18 is enlarged conically on the outlet side, that is to say its wall thickness starts from the disc 17 and decreases towards the outlet side towards the check valve 5. The hollow cylinder 18 at the end close to the inlet side has a rounded shape 21 with which the outer wall of the cylinder is integrated at its end. The hollow cylinder 18 has a thicker wall thickness at its inlet end than at its outlet end. The length of the hollow cylinder 18 corresponds at least to its radius. However, this length is generally larger. This length is also on the order of twice the radius.

The outlet duct 22 is the disc 1 of the insert 12.
It is located in 7. The outlet duct 22 completely penetrates the disc 17. The outlet duct 22 has a portion 22a with a portion 22a having a smaller diameter and a portion 22b having a larger diameter.
Has a vortex space 25 arranged on the upstream side of. Exit duct 2
The two vortex spaces 25 have three inlet ducts 23 arranged rotationally symmetrically. Each inlet duct 23 is arranged on the inlet side of the disc 17 of the insert member 12, ie on the side remote from the delivery valve 5. The inlet ducts 23 open towards the inlet side, that is to say each inlet duct has a grooved surface 20. Each inlet duct 23 extends from the wall of the hollow cylinder 18 to the outlet duct 22, and each inlet duct 23
Is tangentially open to the outlet duct 22. The flow of product through the inlet duct 23 is thus created in the outlet duct 22, i.e. in the vortex space 25, with eddy turbulence. In this case, a flow with a substantial azimuthal component is obtained in the outlet duct 22.
This component is larger than the axial flow component.

At the end closer to the outlet duct 22, each inflow duct 23 has a reduced cross-section portion 24 formed by the inlet duct 23 having a cross-section which constantly decreases in the direction towards the outlet duct 22. Each inlet duct 23 does not extend precisely in the radial direction, but rather extends outwardly from the wall of the hollow cylinder 18 towards a point which is displaced outwardly by a predetermined amount relative to the center point of the disc 17.

A radially extending bar portion 26 or projection on the outflow side is arranged on the surface 19 of the disc 17 and is a hollow cylinder 1.
8 to the axial bar portion 27 of the wall. The intermediate space remains free between each bar portion 26. The wall thickness of the hollow cylinder 18 is constant in the area between the axial bar portions 27. The wall thickness of each axial bar portion 27 is close to the outlet from the disc 17 until the wall thickness at the ends of the insert member 12 corresponds to the thickness of the region between the axial bar portions 27. Reduce continuously until the end.

In the one modification (see FIG. 5), the surface 1 of the disk 17 is
On the outflow side of 9 ', the axial groove 2 of the wall of the hollow cylinder 18'
There is a radially extending groove 26 'which is open at 7'. The wall thickness of the hollow cylinder 18 'is constant in the region of the axial groove 27'. The wall thickness outside the axial groove 27 'is circular until the wall thickness at the end of the insert 12 close to the outlet corresponds to a constant thickness in the region of the axial groove 27'. It decreases continuously from the plate 17 toward the end closer to the exit.

The groove or the intermediate space between the bar portions guarantees the product path even when the valve member 4 is pushed in significantly.

The mode of operation of the delivery device 1 and in particular the cooperation between the insert 12 and the engagement body 13 is clear from FIG. The insertion member is pressed toward the engagement body 13 by the protrusion 29. In this case, the direct path through the outlet duct 22 is blocked. The product delivered via the riser and product duct 14 towards the valve 5 has an annular space 28 formed between the abutment 13 and the end of the hollow cylinder 18 close to the inlet.
You have to go inside. From this space the product is pushed into the inflow duct 23 and carried towards the outlet duct 22. Since the cross section of the inlet duct 23 is continuously reduced,
This product will be accelerated. The product flows through the annular space 9 and the lateral duct 7 to the outlet or delivery nozzle.

The size of the expansion space 10 decreases when the valve member 4 is pushed down, that is, when the delivery valve 5 opens. The larger the degree to which the valve member 4 is pushed down, that is, the larger the opening degree of the delivery valve 5, the larger the degree of reduction in the size of the expansion space 10 becomes. Proper alignment between the opening of the lateral duct 7 and the expansion space 10 makes it possible to partially compensate for the effect that the volume flow increases to a lesser extent than would normally be expected when the valve member 4 is activated. Valve 4 in this way
Very precise and sensitive control of the volume flow can be achieved during the operation of the. As the valve member 4 moves towards the insert member 12 against the force of the return spring 6 to the extent that it hits the insert member, each groove 26 'or bar portion 26 ensures a flow path for fluid. The axial groove 27 'or the axial bar portion 27, on the one hand, provides an interruption in the smooth surface of the hollow cylinder 18 so as to reduce the product flow component in the azimuthal direction after leaving the outlet duct, and On the other hand, the hollow cylinder 18 has a smooth edge at its end close to its outlet so that no additional turbulence phenomena occur when leaving the hollow cylinder 18.

Hollow cylinder 18 or axial bar portion 27
The conical shape allows the return spring 6 in the insert 12 to be aligned. Since the insert member 12 has a round cross section like the product duct 14, the insert member 12 can be pushed into the product duct 14 at any angular position. Assembly is further facilitated by the rounded portion 21.

The drawability of the throttle nozzle structure 11 can be controlled by the two parts 22a, 22b of the outlet duct 22 in a very simple manner. Smaller diameter portion 22a
Increasing the length of the increases the flow resistance. On the other hand, reducing the length reduces the flow resistance. The rest of the shape of the insert 12 does not have to change.

The manufacture of the delivery device 1 is extremely simple.
The device 1 compared to the manufacture of conventional delivery devices
The only difference is that 2 has to be additionally inserted in the product duct. However, due to the rounded portion 21 of the insert 12 and its round cross section, the additional work steps are very simple and therefore practically do not adversely affect the production.

[Brief description of drawings]

1 is an axial cross-sectional view of one embodiment of the delivery device of the present invention.

2 is an enlarged axial sectional view of the insertion member of FIG.

3 is a bottom view of the insertion member of FIG. 2. FIG.

FIG. 4 is a plan view of the insertion member of FIG.

5 is a plan view of a modification of the insertion member of FIG.

[Explanation of symbols]

 1 Delivery Device 5 Delivery Valve 11 Throttle Nozzle Structure 14 Product Path (Product Duct) 22 Outlet Duct 23 Inlet Duct

Claims (16)

[Claims] 1. A product channel, which can be closed by a delivery valve and which has a throttle nozzle structure, is arranged substantially in the throttle nozzle structure on its inlet side in a plane extending orthogonally to the axial direction. And at the outlet side of the throttle nozzle structure, there is provided a substantially axially extending outlet duct in which the inlet duct opens substantially tangentially so as to permit flow and gas pressure In the delivery device for a spray can filled with the product in 1), the throttle nozzle structure 11 is arranged in the product path 14 upstream of the delivery valve 5 in the flow direction. Sending device. 2. An expansion space 10 is provided between the throttle nozzle structure 11 and the delivery valve 5.
The delivery device according to claim 1. 3. Delivery device according to claim 2, characterized in that the dimensions of the expansion chamber (10) change, in particular decrease, when the delivery valve (5) is activated. 4. Delivery according to any one of claims 1 to 3, characterized in that the inlet duct 23 comprises a cross section which decreases in the area of the mouth opening into the outlet duct 22. apparatus. 5. The cross-section of the inlet duct 23 decreases continuously towards the outlet duct.
The delivery device according to claim 4. 6. A plurality of, especially two or three, rotationally symmetrically distributed inlet ducts 23 are provided.
The delivery device according to any one of claims 1 to 4. 7. An outlet duct 22 fitted into and penetrating said product channel 14 in said throttle nozzle structure 11,
An insert member 12 is provided which is at least partly open towards the inlet side and has an inlet duct 23 resting on an engagement body 13 in the product path 14, the engagement body 13 covering the outlet duct 22 on the inlet side. 7. A part of the inlet duct 23 is exposed to the outside.
The delivery device according to any one of 1. 8. At least in the region of the insert member 12, the product duct 14 has a circular cross section or a regular polygonal cross section, the cross section of the insert member 12 being a cross section of the product duct 14. Characterized by conforming to,
The delivery device according to claim 7. 9. The disc 1 including the inlet duct 23 and the outlet duct 22 in the insert member 12 and arranged substantially orthogonal to the axis of the product duct 14 in the hollow cylinder 18.
9. The delivery device according to claim 8, characterized in that 7 is provided. 10. The delivery device according to claim 9, characterized in that the disc 17 is delimited by two flat surfaces 19, 20 which are substantially parallel to each other. 11. The hollow cylinder 18 expands in a conical shape on the outlet side.
Or 10 delivery devices. 12. On the outlet side, the disc 17 extends outwardly from the outlet duct 22, in particular in the radial direction,
12. A groove 26 'or a bar portion 27 communicating with the axial groove 27' or the axial bar portion 27 formed on the inner side wall of the hollow cylinders 18 ', 18 is provided. The delivery device according to any one of 1. 13. The wall thickness of the hollow cylinders 18 ', 18 is substantially constant in the region of the axial grooves 27' or in the region of the intermediate space between the axial bar portions 27. 13. The delivery device of claim 12 characterized. 14. At the end near the outlet the hollow cylinders 18 ', 18 have a wall thickness corresponding to the wall thickness in the region of the axial grooves 27 or in the region of the intermediate space between the axial bar portions 27. 14. The delivery device of claim 13 having. 15. The hollow cylinder 18 has a length equal to at least its radius.
15. The delivery device according to any one of 1 to 14. 16. The outlet duct 22 is provided with a portion 22a having a smaller diameter and a portion 22b having a larger diameter at which the inlet duct opens, and the outlet duct 22 is provided with the portion 22b. The delivery device according to item 1.