JPH0834465A - Tap stopcock with degassing device - Google Patents

Abstract

PURPOSE: To certainly prevent excessive inner pressure and to also prevent the atmosphere from being sucked into a container at a time of the generation of extremely low inner pressure by providing a venting device using a plastic stopper having a slit for a tap stopper. CONSTITUTION: A tap stopper 9 having an overpressure preventing device 11 has a male screw thread 12 and an O-ring packing 14 seals the stopper hole of a container in a gas-tight and liquid-tight state when the tap stopper 9 is screwed in the stopper hole of the container. The stopper 9 has a center hole 15 and the overpressure preventing device 11 formed as a mushroom-shaped plastic stopper 16 is pushed in the center hole 15 to be engaged therewith. The plastic stopper comprises relatively rigid polyethylene and a single or a plurality of slits are formed to the lower port of the plastic stopper in a longitudinal direction to make the stopper 16 elastically deformable. The overpressure preventing device 11 opened for the first time by inner pressure of about 200-350 hP being a presettable objective value can be formed in dependence on the shape of the slit 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tap cap or screw cap made of a thermoplastic material having a degassing device, which has a screw thread and an annular ring packing, and is particularly suitable for a dangerous liquid. A gas-tight and liquid-tight screw-in type or a screw-in type to a corresponding plug pipe piece provided in a filling opening or a discharging opening of a container for storing and transporting a filling.

[0002]

2. Description of the Prior Art Tap caps or threaded caps or screw caps or threaded closures of this type are used in the industrial field, for example of steel sheets or plastics, with filling capacities of up to 220 l. Used for canisters, barrels, and barrels with taps. Alternatively, a so-called IBC 'having a filling capacity of about 1000 l
Also used for threaded lids on pallet containers such as _S.

A packing that is placed under special conditions (sun irradiation, temperature fluctuations) and thereby forms a high vapor pressure when it is transported by a motion accompanied by rocking or when it is stored outdoors. And / or when a filling, which is basically prone to gassing, is introduced into the container, a disadvantageous internal pressure (overpressure) may occur in the container. Therefore, for decomposing substances such as peroxides it is necessary to degas at a minimum pressure already. In contrast, in hot-filled products, the container is closed immediately after filling,
Significant negative pressures can also occur if the filling is cooled. Such negative pressures can significantly dent the container and must be avoided.

It is known that a corresponding two-way valve is provided in the container. By this two-way valve, the gas inside the container and the surrounding atmosphere are exchanged in both directions, and the container overpressure and the negative pressure are eliminated. However, a two-way valve of this type is already opened in the case of very small pressure differences, and unless care is taken to prevent rainwater from spilling out or collecting at the top of the tap plug, it is Rainwater may be sucked under low pressure and reach the inside of the container.

That is, the known gas inlet / outlet device is
It has the disadvantage that it has only a small, unspecified resistance to internal pressure. Therefore, in many cases, degassing is already performed with a very small overpressure. However, in special cases it is desirable that the degassing device is only opened at a defined relatively high internal pressure in order to avoid a permanent overexpansion of the container, in particular of a rectangular pallet container. is there. Furthermore, in terms of safety technology, a degassing device of this type is provided as a safety rupture protection device, for example when it is locally heated. This prevents rupture (explosion) of the container when it is filled with a particularly dangerous liquid fill.

[0006]

SUMMARY OF THE INVENTION The object of the invention is to improve tap taps of the type mentioned at the outset, which are equipped with a degassing device, for the storage and transport of particularly dangerous liquid fillings. In containers such as tap-barrels or pallet containers, on the one hand, excessive overpressure can be reliably prevented, and on the other hand, simple uncontrolled degassing in the event of very low internal pressures. And to provide an inexpensive tap stopper.

[0007]

In order to solve this problem, in the structure of the present invention, in the tap plug of the type described at the beginning, the degassing device has a presettable target value of about 200 hPa (= 0). It is designed as an overpressure prevention device that opens for the first time at an internal pressure of 0.2 bar). This defined opening pressure is particularly suitable and advantageous for packings having a relatively low boiling point.

Advantageous configurations of the invention are described in the subclaims. It is particularly advantageous if the overpressure protection device is first opened with an internal pressure of about 350 hPa (= 0.35 bar), which is a preset target value. The tolerance is in this case approximately ± 30 hPa (= 0.03 bar).
On the other hand, such means, that is, the means for opening the overpressure prevention device at a preset target value (minimum overpressure) that can be set for the first time, on the other hand, has a slight temperature fluctuation (for example, Ensure that there is no constant "expiration" (day and night) and re-inhalation of moisture-laden air. The constant expulsion or escape of the gas phase from the container ultimately leads to a loss of packing with significant environmental pollution in the long run. On the other hand, this means is suitable for containers with tap stoppers having an overpressure protection according to the invention, for example rupture (explosion) and excess of the container due to overheating in the event of a fire in the vicinity of the stored container. It is possible to reliably prevent the formation of a large internal pressure.

In another configuration of the present invention, the overpressure prevention device is
It is formed as a stepped mushroom-shaped relatively stiff plastic plug, which has a radially wide flat cylindrical flat disk-shaped upper part and a smaller diameter than the upper part. Similarly, it has a cylindrical middle part and a pin-shaped thin lower part, and the upper part of the lower part is formed in a stepped cylindrical shape, and the relatively thick lower part has a small number. It is wide and has a generally frustoconical shape, in which case the lower part can be pushed into the corresponding opening or hole in the tap plug,
A frusto-conical protruding lower area locks behind the opening and in the central hole of the tap plug. Below the disc-shaped upper part, a ring packing is provided on the outer peripheral surface of the middle part, and this ring packing may be formed as an O-ring packing in the embodiment. It is particularly advantageous if such a ring packing that surrounds the central part is designed as an annular flat packing.

In another configuration of the present invention, the middle portion has a flat annular ring groove on the outer peripheral surface for receiving or fixing the ring packing. Advantageously, the pin-shaped lower part of the plastic plug is provided with at least one slit which extends up to the middle part which has a receptacle for the ring packing. Also, it is advantageous if the lower part of the plastic stopper has a cross-shaped slit,
As a result, the pin-shaped lower portion can be easily pushed into the hole of the tap stopper, and is locked behind the hole.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

A large capacity pallet container is shown in FIG. 1 as an example of use. This pallet container mainly comprises an inner container 4 for containing a liquid filling, a bottom pallet 2 and a lattice structure 3 as an outer cover 1 fixed to the bottom pallet 2 and having a supporting function. Have An inner container 4 having a thin wall is inserted into the outer cover 1. This inner container 4 is made of blow-molded thermoplastic or welded special steel sheet and has an outlet 5 in its lower area and a filling tube piece 6 with an external thread in its upper area. It is provided. A large screw cap 7 having a female screw thread (enlarged again in the upper part of the drawing and shown again) is screwed onto the filling pipe piece 6. The large screw cap itself has a plug hole 8 having a female thread at the center thereof.
The tap plug 9 of the present invention having a male thread is screwed into the.

The tap stopper 9 is provided with an overpressure prevention device, and as shown in FIG. 2, a tap stopper barrel, which is a plastic in this embodiment, can be directly used without using a large screw cap 7. Made L-ring barrel (L-Ri
ng-Faβ) 10 may be screwed into the corresponding plug hole.

FIG. 3 shows independently the tap plug 9 with the overpressure protection device 11 according to the invention. This tap plug 9 has a male thread 12. On the outer circumference of the tap plug 9 below the male thread 12 to seal the tap plug 9 against the corresponding plug hole (in an L-ring barrel, or a large screw cap of a pallet container).
An annular groove 13 is provided for receiving the O-ring packing 14. This O-ring packing 14 is compressed when the tap plug 9 is gas-tightly and liquid-tightly screwed into the plug hole, and seals the tap plug 9 with respect to the plug hole. Tap plug 9
Has a central hole 15. The central hole 15 provides pressure compensation. Especially after hot filling, the overpressure protection device 11, which is formed as a stepped mushroom-shaped plastic plug 16, is pushed into the central hole 15 only after the filling has been cooled, whereby a negative pressure is applied. Formation is avoided.

FIG. 5 shows the plastic plug 16 in an enlarged manner. This stepped mushroom-shaped plastic plug 16 is made of high molecular weight polyethylene (PE), which is relatively rigid.
And is integrally formed as an injection-molded part and has three partial areas 17, 18, 21.
The first partial area is formed as a flat, cylindrical, disk-shaped or dish-shaped upper portion 17 having a wide width in the radial direction. The outer edge of the upper portion 17 is chamfered at an angle. Below the upper part 17, a second part is integrally formed with a middle part 18 which is like a disk and whose lower edge is chamfered more acutely. The middle part 18 is generally shorter than the upper part 17 in the radial direction, i.e. has a smaller diameter than the upper part 17. The middle portion 18 has an annular groove 19 for receiving and fixing the O-ring packing 20 in the upper outer region 18a, that is, the outer peripheral surface. This O-ring packing 20
Is compressed when the plastic stopper 16 is inserted into the center hole 15 of the tap stopper 9 and locked, and when the pressure difference is small, the plastic stopper 16 is attached to the tap stopper 9 and to the entire container. Seal it.

The third part of the plastic plug 16 consists of a pin-shaped lower part 21, the narrow upper part 21a of this lower part 21 being formed in a stepped cylindrical shape and its lower part 21b thicker. , Is formed into a substantially frustoconical shape. In this case, the lower portion 21 is the tap stopper 9
It can be pushed in and locked in the corresponding central hole 15 provided in the. Due to the stepped portion of the upper area 21a forming the undercut portion 22, the plastic plug 1
6 is locked and fixed in the hole 15 of the tap plug 9, which also has an undercut 23. However, in order to be pushed in and locked, it is necessary for the plastic plug 16 to be elastically formed in the region of the lower part 21. This is achieved, on the one hand, by the fact that the entire plastic plug 16 is made of a material which meets special requirements, namely high molecular weight polyethylene. On the other hand, the elasticity of the lower portion 21 can also be obtained by forming one or a plurality of slits 24 in the lower portion 21 in the longitudinal direction of the plastic pin 16. Advantageously, the lower part 21 is provided as two cross-shaped slits 24, which are orthogonal to each other.

Due to the slit 24, the overpressure formed in the container is directly connected to the middle part 18, the O-ring packing 20 or the ring-shaped flat packing 25 which is a ring packing, and the upper part 17 of the plastic stopper 16. Can act on. Depending on the geometry of the slits 24--in this case, in particular the thickness--and depending on the material used, the slits 24 reach the desired critical value and the defined opening pressure for the internal pressure formed. , Apply a predetermined resistance force. Thereafter, a higher overpressure overcomes the sealing action of the ring packing 20,25 and allows escape. Therefore, for example, it has a predetermined opening pressure of 200 hPa or 350 hPa, or approximately ± 30 around this value.
Plastic stopper 16 having a predetermined opening pressure range of hPa
Is manufactured. Due to the opening pressure of about 200 hPa, the flat packing 25 has, for example, an EP with a Shore A hardness of 50 ± 5.
Made of foam rubber material such as DM, 12 ±
It has an inner diameter of 0.1 mm and a thickness (height) of 2.6 ± 0.1 mm. This material is S. O. Standard 162
EPDM No. 9 containing ethylene, propylene, tar and polymer components.

FIG. 4 shows a plastic stopper 16 according to the present invention.
Another advantageous configuration of is shown. In this case, the same parts are given the same reference numerals. This plastic stopper 1
6 differs from the plastic plug 16 shown in FIG. 3 as follows. That is, this plastic plug 16 does not have an O-ring packing, but has already been described above.
It has a flat packing 25 with a rectangular cross section. In FIG. 4, an additional fine, textile woven gauze 26 is arranged inside the tap plug 9 below the central hole. After passing through this gauze 26, the resulting vapor layer or overpressure can escape from the container, but the liquid particles remain in the container. For example, due to the opening pressure of 350 hPa, the height of the flat packing 25 may be 2.1 mm, and the shore A hardness of 50 ± 5 is N.
It may consist of another material such as BR. As the height of the ring packing 20 or the flat packing 25 increases, these packings are more strongly compressed at the locking position, and the target value of the opening pressure becomes higher.

[0019]

The main advantage of the present invention is that the ring packings 20 and 25 of the plastic stopper have a flat disc-shaped upper portion 1.
It is obtained by being protected and arranged under 7. As a result, the ring packings 20 and 25 are protected against solar irradiation (ultraviolet rays) at this place,
Does not cause early aging, hardening or brittleness of ring packing,
As a result, the opening pressure limit value does not change.

According to the invention already described by way of example,
The problems mentioned at the outset are solved in a simple and inexpensive way.
Further, liquid containers such as tapped barrels, canisters, barrels and large pallet containers can be protected against extremely high overpressures as a burst protection device.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment in which the tap stopper of the present invention is used in a pallet container.

FIG. 2 is a view showing an example in which the tap stopper of the present invention is used in a barrel made of a plastic tap stopper.

FIG. 3 is a view showing a first embodiment of the tap stopper according to the present invention.

FIG. 4 is a view showing a second embodiment of the tap stopper according to the present invention.

FIG. 5 is an enlarged view of the tap plug of FIG.

[Explanation of Codes] 1 Outer cover 2 Pallet 3 Lattice structure 4 Inner container 5 Outlet port 6 Filling tube piece 7 Screw cap 8 Plug hole 9 Tap plug 10 L-ring barrel 11 Overpressure prevention device 12 Male screw thread 13 Annular groove 14 O-ring packing 15 Center hole 16 Plastic plug 17 Upper part 18 Middle part 18a Upper range 19 Annular groove 20 O-ring packing 21 Lower part 21a Upper range 21b Lower range 22,23 Undercut part 24 Slit 25 Annular flat packing 26 Gauze

Claims (7)

[Claims] 1. A tap stopper made of a thermoplastic having a degassing device, which has a screw thread and an annular ring packing, and which is a stopper opening of a container for storing and transporting a filling material. In the type in which the gas thread and the liquid thread are screwed into the corresponding screw threads provided in, the degassing device has a presettable target value of about 200 h.
Tap cap made of thermoplastics with a degassing device, characterized in that it is formed as a pure overpressure protection device (11) that opens for the first time with an internal pressure of Pa (= 0.2 bar). 2. The overpressure prevention device (11) has a preset target value of about 350 hPa (= 0.35 ba).
The tap stopper according to claim 1, which is opened only by the internal pressure of r). 3. An overpressure protection device (11) is formed as a stepped mushroom-shaped relatively rigid plastic plug (16) which has a wide radial width. Flat cylindrical disk-shaped upper part (17)
And a cylindrical middle part (18) having a smaller diameter than the upper part (17) and a pin-shaped thin lower part (2).
1) and the upper region (21a) of the lower portion (21) is formed into a stepped cylindrical shape, and the relatively thick lower region (21b) is somewhat wide and almost cut. It has a frustoconical shape, in this case the lower part (21)
Is the corresponding opening (1) in the tap plug (9).
5) Tap tap according to claim 1 or 2, which can be pushed into the hole and which is locked in the hole (15) by a protruding lower area (21b) of frusto-conical shape. 4. The middle part (18) has an upper area (1
The tap plug according to claim 3, wherein the outer peripheral surface of 8a) has an annular groove (19) for receiving a ring packing (20). 5. The tap plug according to claim 3, wherein the ring packing (20) is formed as a flat packing (25) of rectangular cross section. 6. The lower part (2) of the plastic stopper (16)
Tap tap according to any one of claims 1 to 5, wherein 1) has at least one slit (24). 7. A lower portion (2) of a plastic stopper (16).
7. The method according to claim 6, wherein 1) has cruciform slits (24).
The described tap stopper.