Ionization Device

Abstract

The present invention relates to a glass parts release prevention, or specifically a glass splinter protection, for ionization devices, wherein a glass bulb 1 is at least partially covered by a polymer film 3. The electrode 4 is arranged within the glass bulb 1, and an outer electrode 5 is slid over the outer contours of the polymer film 3.

Claims

1. Ionization device, comprising a glass bulb and electrodes, comprising an inner electrode being provided within the glass bulb and an outer electrode being provided on the outer side of the glass bulb so that the glass bulb is disposed between electrodes, thereby isolating the inner and outer electrodes from each other, characterized in that the glass bulb is at least partially covered with a polymer film.

2. Ionization device according to claim 1, wherein the polymer film at least partially covering the glass bulb is based on a polymer, preferably the polymer film is formed of a polymer, said polymer being selected from the group consisting of polytetraflouroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinylidenfluoride (PVDF), crosslinked fluoropolymer, polyvinylchloride (PVC), polyesters, ethylene-based polymers, further polyolefins, ethylene-vinyl acetate copolymer (EVA), elastomers, and silicone.

3. Ionization device according to claim 1, wherein the polymer forming the polymer film is a shrinkable polymer.

4. Ionization device according to claim 1, wherein the polymer film is a heat-shrinkable polymer tubing.

5. Ionization device according to claim 1, wherein the polymer film is based on a fluorine-containing polymer.

6. Ionization device according to claim 1, wherein the polymer film is based on polytetrafluoroethylene (PTFE).

7. Ionization device according to claim 1, wherein the electrodes comprise aluminum, stainless steel, silver, copper, chromium or gold.

8. Ionization device according to claim 1, wherein the electrodes are made of a mesh-like material.

9. Ionization device according to claim 8, wherein the mesh-like material is wire mesh or stretch grid.

10. Ionization device according to claim 1, wherein the glass bulb has the form of a tube.

11. Ionization device according to claim 1, wherein a glass bottom is formed integrally with the glass bulb and closes one end of the glass bulb.

12. Ionization device according to claim 1, wherein the whole glass part accessible to the outside is covered by the polymer film.

13. Ionization device according to claim 1, wherein the polymer film extends beyond the outer surface of the glass bulb and is folded into the inner part of the glass bulb.

14. Process for the production of a ionization device, comprising the steps of: providing a glass bulb; providing a polymer film over at least a part of the outer circumferential surface of the glass bulb; inserting an inner electrode into the glass bulb; placing an outer electrode above at least a part of the outer circumferential surface of the polymer film.

15. Process for the production of a ionization device according to claim 14, wherein the step of providing a polymer film over at least a part of the outer circumferential surface of the glass bulb comprises providing a heat-shrinkable polymer tubing over at least a part of the outer circumferential surface of the glass bulb, wherein the inner diameter of the heat-shrinkable polymer tubing is the same as or larger than the outer diameter of the glass bulb, and is followed by heating of the heat-shrinkable polymer tubing in order to shrink it until is closely fits on at least a part of the outer surface of the outer circumferential surface of the glass bulb.

16. Process according to claim 15, wherein the heat-shrinkable polymer tubing extends over the closed end of the glass bulb before heating the heat-shrinkable polymer tubing.

17. Process according to claim 14, wherein all accessible outer circumferential surface of the glass bulb is finally covered by the polymer film.

18. Process according to claim 15, wherein the heating is performed in an oven or a heat tunnel.

19. Process according to claim 15, wherein the heating step is performed up to a temperature of 80 C. to 360 C., preferably 320 C. to 340 C.

20. Process according to claim 15, wherein the glass bulb is kept at the final heating temperature for 10 s to 1 h, preferably 5 to 15 min.

21. Process according to claim 15, wherein the heat-shrinkable polymer tubing is folded and pressed at the bottom of the glass bulb.

22. Process according to claim 15, wherein the polymer film is folded over the edge of the open end of the glass bulb before heating, thereby projecting into the interior of the glass bulb.

23. Process according to claim 14, wherein the polymer film is closed over the edge of the open end of the glass bulb with any thread.

24. Process according to claim 14, wherein the polymer film is stitched over the edge of the open end of the glass bulb.

25. Process according to claim 14, polymer film is cut close to the open end of the glass bulb after heating, preferably with a distance of approximately 1 cm from the open end of the glass bulb.

26. Use of an ionization device, comprising a glass bulb and electrodes comprising an inner electrode being provided within the glass bulb and an outer electrode being provided on the outer circumference of the glass bulb so that the glass bulb is disposed between electrodes, thereby isolating both electrodes from each other, in food industry or food processing industry or in systems used in said industries, wherein the ionization device, if a glass part thereof is broken, is prevented from releasing broken glass parts.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is an isometric view of an ionization device according to a first embodiment of the present invention.

[0022] FIG. 2 is a section view of the ionization device of FIG. 1.

[0023] FIG. 3 is an isometric view of an ionization device according to a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] FIG. 1 shows an embodiment of the ionization device comprising a glass bulb, here in a preferred form of a glass tube, which is closed on the one side with a bottom 2, being integrally formed with the glass tube 1. The glass tube 1 and the bottom 2 are covered, in the present preferred embodiment fully covered, by a layer of polymer film 3. In a further preferred form of the embodiment, the polymer film 3 is applied in the form of a heat-shrinkable tubing. The polymer film 3 is thus preferably formed by a heat-shrinkable polymer tubing. The one end section of the heat-shrinkable polymer tubing is folded and compressed to form a compressed part 6. The inner electrode 4, formed as a net electrode, is inserted into the glass tube. On the outer side, the outer electrode 5 is provided directly onto the polymer film 3, tightly fitting on the glass tube 1 including the bottom 2. The whole glass tube is closed at its open end by a connector 7, also providing the possibility of providing electric connection with the inner net electrode 4.

[0025] FIG. 2 shows a section view of the ionization device. Herein, especially a compressed part 6 becomes visible, where a part of the polymer film 3 is compressed to form an end at the bottom 2 of the tube.

[0026] From FIGS. 1 and 2, it can be recognized that the glass bulb 1 effectively separates the inner electrode 4 and the outer electrode 5. In the present preferred embodiment, the glass bulb 1 is fully covered by the (preferably heat-shrinkable) polymer film 3, which tightly fits on the outer contours of the glass bulb 1 including its bottom 2. It can also be seen that the outer electrode 5 closely fits onto the outer circumference of the polymer film 3. On the end part of the glass bulb 1, i.e. on the outermost position of the bottom 2, the polymer film 3 is compressed and cut, forming an compressed part 6. Thus, the whole glass bulb 1 is effectively covered by shrunk polymer, so that no splinters can be released even if the glass bulb breaks.

[0027] A production of an ionization device as described above can easily be implemented and further be applied to any conventional type or arrangement of ionization devices.

[0028] In the following, a preferred embodiment of the production of a ionization device with a polymer film 3 is described, using a heat-shrinkable polymer tubing.

[0029] At first, a glass bulb 1 comprising a bottom 2 is provided.

[0030] Subsequently, a heat-shrinkable polymer tubing is provided to form a polymer film on the outer side of the glass bulb 1 including the bottom 2, wherein the inner diameter of the heat-shrinkable polymer tubing 3 can be generally the same or larger than the outer diameter of the glass bulb 1.

[0031] In the subsequent step, the glass bulb 1 including the bottom 2 and the heat-shrinkable polymer tubing 3 are heated, until the heat-shrinkable polymer tubing 3 after being shrunk closely fits on the outer surface of the outer diameter of the glass bulb 1 including the bottom 2, thereby forming a polymer film 3. This heating is preferably preformed in an oven or a heat tunnel (possibly equipped with a conveyor), but could also be performed with a heat gun. In the area of the bottom 2, the polymer film 3 is cut at some point and pressed together to form a compressed part 6 in order to have a complete sealing of the bottom 2 by the polymer film 3.

[0032] Subsequently, the inner electrode is inserted into the glass bulb, and the outer electrode is slid over the outer diameter of the polymer film 3 in order to be fixed there.

[0033] The heating step can be performed at a temperature ramp up to a temperature suitable to shrink the shrinkable polymer, for example a range of 80 C. to 360 C., preferably from 320 C. to 340 C.

[0034] When the desired final heating temperature is reached, this temperature is preferably kept for 10 sec to 1 h, even more preferably 5 min to 15 min in order to obtain a full shrinking of the heat-shrinkable polymer tubing 3 and to achieve that the heat-shrinkable polymer tubing 3 closely fits on the outer diameter of the glass bulb 1 and the bottom 2. One preferential arrangement during the production of the ionization device is to have the heat-shrinkable polymer tubing 3 firstly overlap the open end of the glass bulb 1 and then folding it over the edge of the open end of the glass bulb 1 before heating, thus a part of the heat-shrinkable polymer tubing 3 projects into the interior of the glass bulb 1. In this case, the shrinking of the heat-shrinkable polymer tubing 3 starts in the interior of the glass bulb 1, proceeds over the glass bulb 1, thereby preventing the formation of air bubbles between the glass bulb 1 and the heat-shrinkable polymer tubing 3. Thereby, it can be achieved that the heat-shrinkable-tubing 3 closely fits on the glass bulb and the bottom 2.

[0035] The process according to the present invention has a further advantage that up to tens of bulbs or even some 100 bulbs can be treated simultaneously, and because of the preferred form of the heat-shrinkable polymer tubing 3, the ionization devices can be heated up to a temperature of approximately 340 C. At an appropriate time, the heat source is switched off and the oven including the glass bulbs is cooled down. After, the glass bulbs can be taken out of the oven.

[0036] One preferred solution is to cut the shrunk and cooled polymer film at the open end for approximately 1 cm before mounting the connector 7 to the glass bulb 1. Here, an optimal adhesion between glue applied to the connector 7 can be obtained, and simultaneously, the connector 7 still overlaps the part of the glass bulb 1 in which the heat-shrinkable polymer tubing 3 is applied, so that no areas of the glass bulb 1 remain uncovered by the heat-shrinkable polymer tubing 3.

[0037] FIG. 3 shows a second embodiment of the present invention. Herein, the glass bulb 1 does not have any glass bottom. The glass bulb is open on both ends, but sealed with a connector 7 on both ends. The polymer film 3, which preferably is in the form of a heat-shrinkable polymer tubing, the inner electrode 4 and the outer electrode 5 are provided in a same or similar manner as presented in the first embodiment.

[0038] In the following, the production of the second embodiment of the ionization device with a heat-shrinkable polymer tubing is described.

[0039] At first, a glass bulb 1 is provided. Subsequently, a heat-shrinkable polymer tubing is provided on the outer side of the glass bulb 1, wherein the inner diameter of the polymer film 3 (preferably in the form of a heat-shrinkable polymer tubing) can be generally the same or larger than the outer diameter of the glass bulb 1.

[0040] In a subsequent step, the glass bulb 1 and the preferred heat-shrinkable polymer tubing 3 are heated, until the heat-shrinkable polymer tubing 3 after being shrunk closely fits on the outer surface of the outer diameter of the glass bulb 1. This heating is preferably preformed in an oven or a heat tunnel (possibly equipped with a conveyor), but could also be performed with a heat gun.

[0041] Subsequently, the inner electrode is inserted into the glass bulb, and the outer electrode is slid over the outer diameter of the polymer film 3 in order to be fixed there. Afterwards, connectors 7 are provided on both open ends of the glass bulb 1.

[0042] The present invention is not limited to the embodiments as described above. It is for example possible that the glass bulb 1 has an oval, triangular, quadratic or polygonal cross-section. Also the bottom 2 can have various form. The cross-section of the glass bulb 1 could have different forms or geometries and could even have edges. Further, the polymer film 3 such as a heat-shrinkable polymer tubing can still closely fit on the outer contours of the glass bulb 1 of any such modified forms.

[0043] Further, a moulded part using a heat-shrinkable polymer tubing 3 could be used, for example in the shape of a hose including a bottom. Such a moulded part could easily be applied to a glass bulb 1 including a bottom 2 and would closely fit on such a specific glass bulb.

[0044] Further, the glass bulb 1 could be fabricated without a bottom 2 at all, and any other suitable sealing means for the glass bulb 1 could be applied. Furthermore, the connector device 7 could be suitably adapted in order to also adhere to the polymer film 3, so the polymer film 3 could even cover section(s) where the connector 7 covers the glass bulb 1.

[0045] Other options for applying the polymer film 3 onto the glass bulb 1 are painting and spraying of liquid polymer or dipping the glass bulb into a liquid polymer melt.

[0046] Further, it is possible to use a polymer film 3 together with any kind of glue applied to the inner circumferential area of the polymer film 3. This glue can serve as a linking layer between glass bulb 1 and polymer film 3. Such a linking layer is especially suitable for polymer films 3, preferably in the form of heat-shrinkable polymer tubings, made of polyolefins.

[0047] The present invention relates to a glass parts release prevention, specifically a glass splinter protection, for ionization devices, wherein a glass bulb 1 is at least partially covered by a polymer film 3. The electrode 4 is arranged within the glass bulb 1, and an outer electrode 5 is slid over the outer contours of the polymer film 3.