JPS59208503A - Apparatus for generating and reflecting infrared rays or ultraviolet rays - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an infrared or ultraviolet ray generating and reflecting section 11.
Regarding equipment.

Devices of this type are known and can be constructed in the form of panels and used, for example, in the paper industry, textile industry, plastics industry, etc. Infrared panels are also used in tunnel ovens for baking bread in the bakery industry or for drying paint in the automotive industry.

Infrared radiation is often generated by straight quartz tubes spaced parallel to each other across the entire surface of the panel, with a system of reflectors at the back of the panel designed to reflect all of the emitted radiation forward. Occupied. The structure of this panel and especially the construction of the reflector presents difficult problems for the following main reasons. That is, the reflector and its supporting members are subjected to high thermal stresses as a result of the high temperature of the quartz tube located in the immediate vicinity; - these stresses vary depending on the radiation output of the quartz tube; while occupying a large area of the panel, these It is difficult to fabricate reflectors that withstand high and varying stresses.

French patent No. 7021350 proposes a lighting device comprising a grating for light fractions 1ik, comprising a long reflector, like an intermediate reflector close to the shape of a figure 7, which ends on the lamp side at the top.

This device is concerned with illumination per se and not with infrared radiation.

Furthermore, the opening angle corresponding to loss radiation is 110°,
It represents 30% of the total radiation and no ventilation is expected. Such a structure could not be used at temperatures of about 2700°, ie at the temperature of the device according to the invention.

U.S. Pat. No. 3,654,471 discloses a reflector apparatus for electromagnetic radiation from an elongated radiation source that includes a contoured holder formed in a member having a cavity that provides a support surface for a reservoir of reflective metal plates. Describe it.

In such a construction, a blade of air is generated between the two reflectors, creating a venturi effect and bringing corrosive vapors into contact with the lamp and the reflector part of the device.

In fact, the known devices only solve the problem incompletely. For example, it is known to produce panels that are capable of diffusing only certain wavelengths of infrared radiation. However, since the possibility of changing the wavenumber during operation is an advantage, this actually comes with a disadvantage, and all because short infrared quartz tubes are much more expensive than long infrared tubes.

The object of the invention is to overcome these drawbacks by providing an infrared generation and reflection device in the form of a panel in which a plurality of radiation emitting tubes are collected and reflection means are arranged behind the chain tubes. .

A feature of the invention lies in the fact that said tubes are arranged equidistantly and parallel to each other, and that a reflector plate in the general form of a four-sided array is arranged behind the launch tube. Each tube is placed behind one tube, and each has two (V) flit outer concave arms.
It is formed by a side-by-side assembly of two elongate elements with a g-shaped cross-section. The connecting gap formed between the two parallel elements is closed by a longitudinal shield in this position behind the two elements, each of which is self-supporting.

According to another feature of the invention, each element with a concave V-section is constituted by a sheet metal member bent into said V-section. As a result, said longitudinal element is not only self-supporting, but also capable of elastic deformation under the action of varying thermal stresses of the type encountered, for example, when the radiation power and therefore the wavelength of the emitted light changes during operation. can.

To improve the performance of this device, especially when the infrared radiation has a high intensity, a reflector for an infrared arc tube according to the invention comprises a parallel assembly of two half-thorn-shaped rear shields or elements. , and the at least two half-thorn-shaped elements are preferably hollow, with a cooling fluid circulating within the interior space of the elements.

According to an aspect of the invention, the rear shield is also hollow and double-walled, with cooling fluid circulating within the interior space of the shield.

The cooling fluid circulating within the double wall of the reflector may be air, for example.

A number of different technical solutions can be proposed for constructing the double wall of the shield and of the V-walled elements constituting the two halves.

Improvements can be foreseen to more easily place the protective shield at the level of each connection gap between the two halves.

A shield according to the invention for providing a barrier to radiation emitted by a tube in the direction of a gap formed by a reflector located behind the tube. It is characterized by the fact that it is constituted by an inert strip stretched along the .

According to another feature of the invention, the metal strip forming the shield consists of a metal deposit formed directly on the wall of the chain, and therefore only along the metal or ceramic reflectorized strip. An opacified plain tube is provided.

According to yet another feature of the invention, the shield consists of a concave sheet metal strip attached to a portion of the rear longitudinal wall of the chain. In other words, the width of said thorn-shaped metal strip is significantly smaller than the diameter of the chain pipe. It should be understood that sheet metal is used in its broadest sense, ie, there are no limitations as to the nature of the metal used.

According to yet another feature of the invention, the concave metal constituting the shield is secured to the tube by the snap-action engagement of a resilient locking clip, so that when the tube is replaced, the shield of the old tube is attached to the new tube. can be used.

2 Finally, according to a particular embodiment of the invention, each V-surface element of the reflector plate is provided with a layer of a sheet of gold or other metal at least on its reflective surface.

For purposes of simplicity, the invention described here relates only to devices for infrared generation, but it should be understood that these devices can also be used for any radiation and especially ultraviolet radiation.

Other features of the invention will become more apparent from the following description and the accompanying drawings.

FIG. 1 is a front view of a luminescent and reflective panel according to the invention.

FIG. 2 is a partial cross-sectional view of the panel taken along line I--H of FIG.

FIG. 3 is a perspective view of one of the V-shaped rigid surface elements whose side-by-side assembly forms a reflector.

FIG. 4 is a perspective view showing one of the shields arranged behind the connection gap of the V-shaped solid surface element of the reflector.

3. FIG. 5 is a sectional view taken along the line ■-■ in FIG. 1 and showing the arrangement of the entire reflector and the arc tube.

FIG. 6 shows two parts before assembly for the production of a double wall element with a curved v-wall.

FIG. 7 illustrates the completed element.

Figures 8 and 9 are similar views of a rear shield with double walls.

10 and 11 are drawings showing other shapes of v-section elements and rear shields.

FIG. 12 is a cross section of the reflector plate according to the specific example of FIGS. 6 to 9. FIG.

FIG. 13 is a similar cross-sectional view of a reflector plate obtained by assembling the members of the embodiments of FIGS. 10 and 11.

FIG. 14 is a drawing illustrating a known structure for arranging a shield.

FIG. 15 is a corresponding drawing illustrating an apparatus according to the invention.

FIG. 16 is a drawing 4 of an infrared light emitting tube according to the present invention. It is.

17-19 are drawings of an embodiment of a removable shield according to the present invention.

The drawing shows a panel 1 which is used to generate infrared radiation 2 and to diffuse it by reflection over its entire surface.

Panel 1 consists of two cross members 2 and two long parts + A
3 and 4. The light-emitting quartz tubes 5 are arranged side by side and in parallel on the rectangular frame thus formed. A container tube 5 is arranged in the frame parallel to the cross member 2, one end of the container tube 5 being supported by the longitudinal member 4 and the other end by the longitudinal member 3. The latter is provided with electrical connection means consisting of a terminal connector 6 for supplying current to the quartz tube 5.

The tubes 5 are arranged at intervals on the front side of the panel 1, and the back side of the panel is occupied by a reflector plate 7. The entire reflector is formed by a parallel assembly (FIG. 5) of a V-shaped surface element 8 and a shield 9.

Each V-section element 8 is constituted by a sheet metal member bent into a V-shaped solid surface with concave side surfaces 10 and 11 on the outside. The side surface 10 or 11 of the V-shaped rigid surface has a flange 12 or 13 continuous thereon, and the flange 12 or 13
and 13 follow the slightly inwardly curved shelves 14 and 15.

The structure shown in detail in Figure 3 is thus obtained and is self-supporting and at the same time remains stable under varying stresses and deformations, for example when one wishes to vary the infrared output and wavelength during operation. It has the benefit of allowing the free generation of

To facilitate assembly, each flange 21 and 23 preferably includes a longitudinal slot 16 for each end of the vertical flanges 12 and 13.

Each shield 9 consists simply of a metal sheet strip bent to have an arcuate cross-section, so that the strip is self-supporting.

The width of each shield 9 is greater than or equal to the distance 6 1ii1t 1 B between the flared ends of juxtaposed shelves 14 and 15 after assembly (FIG. 5).

In the best embodiment (shown in FIG. 1), the holder of the V-rule surface element 8 is formed by a simple bottle to which the ends of the shelves 14, 15 are fixed. For the shield 9, three pins can be considered, one in the center of the concave portion and one at both ends of the concave portion.

V for the purpose of forming a rear reflector of the panel 1 according to the invention
The parallel assembly of scholastic surface element 8 and shield 9 takes the form shown in FIG.

In other words, the V-rule surface elements 8 are arranged side by side, and the vertical flange 12 of one element is located in the immediate vicinity of the vertical flange 13 of the adjacent element. For this purpose, a longitudinal reflection channel 19 is formed around each quartz tube 5, the top of which has a longitudinal connecting gap 20. This gap corresponds to the distance between two adjacent flanges 12 and 13, and its width can vary during operation as a function of the power and thus of the temperature. In order to avoid radiation losses towards the rear of the reflector, which in any case corresponds to accidental overheating in that area, behind each gap 720 is provided a longitudinal shield 9 in the manner shown in FIGS. 2 and 5. Closed by covering it. With this configuration, radiation emitted by the vessel 5 in all directions is reflected towards the front of the panel 1.

For assembly purposes, the elongate member 4 preferably has a U-shaped cross-section, the bottom flange 21 of which is provided with a slot 16 that engages a corresponding end of each V-section element 8. Similarly, each longitudinal member 3 has a tJ-section and its bottom horizontal flange 23 is provided with a slot 16 which engages the corresponding end of each V-section element. frame 2
, 3.4, it will be obvious that the ends of the parallel V-section elements are still engaged in a manner that allows the free occurrence of varying expansion deformations between the flanges 21 and 23, respectively.

Each electrical connection terminal 6 is connected to the horizontal flange 25 of the longitudinal member 3 by interposing a sleeve 26 of preferably insulating material.
It consists of a metal-to-metal connection stud 2 fitted into a metal-to-metal connection stud 2. The metal lower end of each stud is connected to a bracket 27 having a filtration device that supplies current to the quartz tube 85 and at the same time supports the corresponding end of the tube 5.

The shield 9 (FIGS. 2 and 5) covering the two juxtaposed inwardly bent shelves 14 and 15 is preferably inserted under the top flange 28 or 29 of the corresponding U-bar rigid face member 4 or 22. It is held in place by engagement.

As will be readily understood, the cross-sectional profile of each reflective tube can correspond to any suitable mathematical shape, in particular a circle, an ellipse or a parabola.

Furthermore, by increasing the width of the gap 20, two adjacent reflecting grooves can be made larger or smaller as desired, thereby making it possible to change the general shape of the reflecting part of the groove 19. For example, this allows the use of two incandescent filaments arranged side by side in one or two quartz tubes.

In any case, the width 18 of the shield 9 is calculated to provide a total barrier to backward radiation passing through the gap 20.

Finally, it should be noted that two consecutive grooves 19 are separated from each other only by an edge 30 of width 90. Therefore, there is no loss of width t11 between 19,
This increases the radiation output of the entire arrangement for panels of the same overall size and makes it possible to install a large number of quartz tubes 5 in said panel.

As explained above, it is possible to enhance the performance of this device, especially when the infrared radiation has a high intensity.

6.7 and 12 show a reflector element constructed by assembling two half-thorn-shaped element parts JA31 and JA32.

Member 31 has two curved arms 3 leading to vertical flanges designated by reference numerals 35 and 36, respectively.
It is made of metal sheet bent to a V7 cross section with 3 and 34.

Member 32 has the same cross section as member 31 (FIG. 6).

To assemble, member 31 is snugly fitted into member 32 and flanges 35 and 360 of member 31 are elastically deformed into engagement between flanges 45 and 46 of member 32. This deformation amplitude corresponds to the thickness 37 of the metal plates of these members. This engagement of member 31 into member 32 is not carried out completely, so as to leave a gap between the members corresponding to a double wall extending over the entire length of the curved vane of V7 cross section.

To complete the assembly, flanges 35 and 45
A welding band or bead 39 joining the flange 36 and a welding band 40 joining the flanges 36 and 46 are deposited on both sides.

Similarly, the rear shield of the reflector is made of the same two members 41
and 42 are formed by their mutual engagement. The member 41 is made of a metal plate bent into the cross-sectional shape of an arc 43 and held upright to form two flanges 47 and 48 at each end.

Member 42 also has a cross section in the form of an arc 44 located between two flanges 49 and 50.

To assemble the shields 41, 42 of FIG.
is press-fitted between flanges 49 and 50 of member 42. This movement takes place with an amplitude of elastic deformation corresponding to the thickness of the metal plate. two arcs 43 and 44
The engagement is not complete in order to leave a free space 51 between them (FIG. 12).

Again, assembly is accomplished by providing a weld zone 52 along flanges 47 and 49, and a similar weld zone 53 joins flanges 4B and 50.

In the embodiment shown in FIGS. 10, 11 and 13, each of the two half-thorns 54 is fabricated in a single piece in the form of a bent sheet metal strip, the cross section of which As in the previous example, the blade 3 is curved to the inside of the two ■.
3 and 34 and two lateral flanges 35 and 36. However, in this case the two lateral flanges 35 and 36 lead to the phase china 35,36.

These two shelves bend towards each other and overlap in their connection area, where they are joined by a welding zone 57. The reflector element 54 is therefore formed in the form of a tube having a substantially triangular cross-section with curved sides.

Similarly, each shield 58 of the reflector plate is a metal plate tl'
Fold the H-pieces back toward the State House until they overlap in their connecting areas.
It has a cross-section including an arc 44 located between two folded flanges 49 and 50 with extensions in the form of 1 and 60. In this area weld zone 51 completes the assembly.

In the heating device, a section of the reflector plate is placed behind each infrared light emitting tube 61 and has a half-thorn shaped section designated by 31.32 (FIG. 12) and 54 (FIG. 13). two elements and 41.42 (first
(Fig. 2) or a rear shield designated by 58 (Fig. 13).

These reflector elements are known to be sufficient to protect the rear area of the device (top in FIGS. 12 and 13) against accidental loss or leakage of infrared radiation in this direction.

In the case of the present invention, each element 3+, 3 of the reflector
2, 41.42 or 54.58 are of double three-walled construction, so they have an internal space 38.51 or 62 in which a cooling fluid, e.g. air or water, is circulated.
．． 63.

Because of this configuration, the heating power of tube 61 can be increased considerably while keeping the entire reflector at a relatively low temperature. Among other things, this protects the rear area of the reflector against accidental overheating.

As previously indicated, the presence of gaps between the reflectors
Loss of infrared radiation and overheating of the rear area of the cassette at the bottom of each trough or behind each quartz tube is likely to occur.

To overcome these drawbacks, the rear shield shown in FIGS. 14 to 19 can be considered.

FIG. 14 shows part of a known type of cassette used as an infrared generator.

The cassette includes launch tubes 71, each positioned opposite a reflection tube 72. The entire reflector assembly consists of a plurality of parallel reflector elements 73 having two concave V-shaped surfaces. The V-pointed tip of each element 73 forms a long ridge 744. Each groove 72 is thus formed between two successive edges 74 formed by two half grooves 75 and 76 corresponding to two different elements 73. The connection between the two half-holes 75 and 76 is made at the bottom of the groove 72 along a gap 77.

In order to prevent the radiation emitted by the tube 71 from being lost by diffusion through the gap 77 into the rear area of the cassette 1, a shield 7 consisting of a shallow hole with high rigidity is provided.
It is possible to place 9. From FIG. 14, the arrangement of the shield 79 must leave a well-delimited free space 80 between the shield 79 and the gap 77 to avoid obstruction of the cooling air flow, and the width of the gap 77 should be smaller than the width of the gap 77. It is clear that the rather large width 81 of the shield must be provided, which complicates the manufacture of the entire cassette to a considerable degree.

According to the invention (FIGS. 15 to 17), this type of shielding is no longer provided behind the gap 77.

This gap 77 continues to be shielded against radiation by a shield 82, but the invention consists in the fact that this shield 82 is located in front of the gap.

In the embodiment shown in FIGS. 15 and 16, shield 82 consists of a narrow strip of metal or ceramic material deposited directly onto the wall of launch tube 83. In the embodiment shown in FIGS. In other words, each tube 83 is provided with its own shield 82 as shown in the form of a narrow metal strip arranged longitudinally on the wall of the chain tube according to the invention.

In the embodiment shown in FIGS. 15 and 17, the metal strip 82 constituting the shield is removable;
In other words, it is designed as a narrow strip of sheet metal that can be attached to the tube 83 by the pressure engagement of a resilient snap-action clip 84.

In the specific example shown in FIGS. 18 and 19, a tubular spacer member 86 is attached to the back side of the metal strip 82 constituting the shield. A hook-shaped fixing clip 85 is provided, formed by a screw 87.degree. and a cross strip 88, which can be removably engaged onto the flange 89 (FIG. 18) 6 by means of a screw 87.

Thus, after assembly (FIG. 18), shield 82 is secured between tube 71 and gap 77 so as to mask gap 77 while allowing air circulation.

[Brief explanation of drawings]

FIG. 1 is a front view of the device of the present invention, and FIG. 2 is a line r in FIG. 1.
3 is a perspective view of the V-locking surface element, FIG. 4 is a perspective view of the shield, FIG. 5 is a cross-sectional view along line V-V in FIG. Figure 6 is an exploded view of the double wall V-cell solid surface element, Figure 7 is its completed view, Figure 8 is an exploded view of the double wall shield, Figure 9 is its completed view, and Figure 10 is the V-cell solid surface element. FIG. 11 is a perspective view of another example of the shield, FIG. 12 is a cross-sectional view of a double-walled reflector, and FIG. 13 shows members of the example of FIGS. 10 and 11. 14 is a perspective view of a known shield arrangement structure, FIG. 15 is a perspective view of a shield arrangement structure according to the present invention, and FIG. 16 is a perspective view of an infrared light emitting tube. Figures 17 through 19 are perspective views of the removable shield. 1 is a panel, 5 is an infrared light-emitting quartz tube, 8 is a V-shaped solid surface element, 9 is a shield, and 20 is a gap. Patent Applicant: Christian Ryung, Agent
Patent attorney Takio Akaoka:. 8

Claims (9)

[Claims] (1) An infrared or ultraviolet generating and reflecting device in the form of a panel in which a plurality of radiation emitting tubes are assembled and reflecting means are arranged behind the tubes, the tubes being equidistantly spaced within a rectangular frame. and arranged parallel to each other,
and a reflector having the general shape of a series of rows of concave troughs is disposed behind the arc tube, each trough being disposed behind one tube and having a V-shaped cross section with two outer concave arms. formed by a side-by-side assembly of two longitudinal elements, each having a gap formed between the two side-by-side elements is masked by a self-supporting longitudinal reflective shield placed at the position behind the two elements. The device characterized in that: (2) Each longitudinal element with a concave V-shaped cross-section consists of a metal plate member bent to said V-shaped cross-sectional profile, so that said element is not only self-supporting but also luminous during operation, for example by means of a quartz tube. Device according to claim 1, characterized in that it is capable of elastic deformation under the action of variable thermal stresses of the type encountered when the radiation power of the light beam and thus its wavelength changes. (3) Each V-section element has two outer concave sides which lead to a flange which leads to a slightly bent inward shelf, so that several elements are juxtaposed. 2. The device according to claim 1, wherein a longitudinal gap is formed between each flange of one elm member 1 and an adjacent flange of an adjacent flange. (4) Each reflector consists of a side-by-side assembly of a rear shield and two half-thorn-shaped elements, each of the at least two half-thorn-shaped elements being hollow and extending within the interior space of the element. Apparatus according to clause 1, in which a cooling fluid is circulated. (5) The apparatus of claim 1, wherein the rear shield is also hollow and has double walls, with cooling fluid circulating within the interior space of the shield. (6) The device of item 1, wherein the cooling fluid circulating within the double wall of the reflector is blown air. (7) Each element in the form of two halves is manufactured by the interengagement of two identical parts made of metal plates bent into a V-section with inwardly curved vanes leading to vertical flanges and assembled. In the device of item 1, the work is performed by a welding zone for joining the flanges. (8) Each rear shield is fabricated by the mutual engagement of two identical parts made of metal plates bent into an arcuate section leading to two vertical end flanges, and the assembly operation consists of welding to join the flanges. The device of paragraph 4 which is carried out by an obi. (9) Each element in the form of two half-thorns is fabricated by bending a single piece of metal sheet completely closed by a longitudinal welded zone, and curved on two sides and by two straight flanges. 4. The device of clause 4 having a joined triangular cross section. 00) Each rear shield is fabricated by bending a single piece of metal plate completely closed by a longitudinal welding zone and a first shield with an arcuate cross-section joined to a flat top wall by two vertical flanges. Apparatus in Section 4. OD. The device of claim 1, wherein at least the reflective surface of each V-section element of the reflector is constituted by a layer or sheet of gold or other reflective metal. (c) a metal or ceramic material applied along a part of the rear surface of the radiant tube to form a barrier for the radiation emitted by said tube in the direction of the gap formed between the reflectors located behind said tube; 2. The device of claim 1, wherein said shield is formed by an opaque strip of. rfi) The apparatus of clause 12, wherein the opaque strip forming the shield consists of a metal deposit formed directly on the wall of the tube, metallized only along the reflective strip in the tube. (The shield is a device according to paragraph 12 consisting of a concave metal strip attached towards a part of the rear longitudinal wall of the tube. fV) The width of the thorn-shaped metal strip is significantly smaller than the diameter of the tube. Apparatus according to paragraph 12. The device of clause 12, wherein the concave metal constituting the shield is secured to the tube by snap-action engagement of a resilient retaining clip so that when replacing the tube, the shield of the old tube can be used on the new tube. (T7) The device of clause 12, wherein the removable fixation of the metal strip is carried out by means of an elastic clip. (111) An infrared tube for installation in the apparatus of paragraph 12, characterized in that an opaque strip of metal or ceramic material is provided along the entire length of the tube, the width of which is less than the diameter of the tube. The shield consists of a concave opaque material of a metal plate with hook-type fixing clips that can be engaged by hooking over flanges on the top edges of the two half-holes, so that the shield The device of paragraph 12 is supported at a distance from the gap masked by the shield without interfering with the circulation. and a resilient fixing strip. The Qυ panel includes a frame formed by two cross members and two longitudinal members, the arc tube being parallel to the cross members. 19. The device of claim 19, arranged side by side in relationship. 1Pδ The device of claim 19, wherein a longitudinal slot is provided in each vertical flange and at each end of the V-section element. (c) Each shield has a concave surface. Device according to claim 19, consisting of a single strip of metal plate having a cross-section and thus self-supporting after said strip is placed in a position covering the rear part of the corresponding longitudinal gap. The apparatus of paragraph 19, wherein the assembly forms an elongated reflecting surface around each quartz tube, the top of which forms a connecting gap whose width can be varied during operation. a horizontal flange is provided along the opposing frame member, and an opposing longitudinal flange is provided along the opposing frame member, a slot at one end of each V-section element engages on the flange of the longitudinal frame member and is formed at an opposite end of the element. The apparatus of paragraph 19, wherein the slots engage on the flanges of the opposing frame members. Equipment of Section 19