Temperature Control Device, Use Of Said Device, Method For Producing A Housing And Housing

Abstract

The invention relates to a device for temperature control in potentially explosive areas, comprising a temperature controller (10) and a housing (11) in which the temperature controller (10) is arranged, the housing (11) having a sealed opening (12) through which electrical lines (13, 14) of the temperature controller (10) are passed. It is characterized in that the temperature controller (10) has a measuring surface (15) which lies directly against an inner wall (16) of the housing (11) at least in certain areas and is electrically connected to an earthing tab (17), said earthing tab (17) being electrically connected to another line (18) which is guided through the opening (12).

Claims

1. Device for temperature control in potentially explosive areas, having a temperature controller (10) and a housing (11) in which the temperature controller (10) is arranged, wherein the housing (11) has a sealed opening (12) through which electrical lines (13, 14) of the temperature controller (10) are passed, characterized in that the temperature controller (10) has a measuring surface (15) which lies directly against an inner wall (16) of the housing (11) at least in sections and is electrically connected to an earthing tab (17), wherein the earthing tab (17) is electrically connected to a further line (18) which is guided through the opening (12) and in particular forms a unit.

2. Device according to claim 1, characterized in that the earthing tab (17) extends along a side wall (19) of the temperature controller (10) and projects over its end face (20).

3. Device according to claim 1, characterized in that the earthing tab (17) has a free end (21) angled towards the temperature controller (10).

4. Device according to claim 1, characterized in that the measuring surface (15) forms a lateral shoulder (22) which is electrically connected to the earthing tab (17).

5. Device according to claim 1, characterized in that a strain relief device (23) of the lines (13, 14, 18) is arranged in the opening (12).

6. Device according to claim 1, characterized in that the temperature controller (10) is formed rotationally symmetrical, in particular in the form of a button thermostat.

7. Device according to claim 1, characterized in that the temperature controller (10) is connected to the inner wall (16) of the housing (11) in a materially bonded manner, in particular by a contact connection.

8. Device according to claim 1, characterized in that the temperature controller (10) has a bimetal switch.

9. Use of the device according to claim 1 as contact controller or as room controller.

10. Method for producing housings for electronic components, in particular temperature controllers, comprising the steps of: extruding a solid housing block which has a front side (24) and a rear side (25) with a retaining profile (26) for connecting to a top-hat rail, transversely dividing the housing block to form several housings (11), and introducing receiving spaces (27) for the electronic component into one of the housing (11) and the housing block.

11. Method according to claim 10, characterized in that the receiving spaces (27) are introduced by a cutting process, in particular by drilling.

12. Method according to claim 10, characterized in that a groove (29) is introduced into one side, in particular the underside (28) of the housing block, in the direction of extrusion, said groove having an internal toothing (30) for a retaining screw.

13. Housing for an electronic component, in particular a temperature controller, having a front side (24) and a rear side (25), which has a retaining profile (26) for connection to a top-hat rail, characterized in that the housing (11) is of integral construction and has a receiving space (27) for the electronic component.

14. Housing according to claim 13, characterized in that the housing (11) is formed from a conductive material, in particular aluminum or an aluminum alloy.

15. Housing according to claim 13, characterized in that the receiving space (27) has an opening (12) which forms a cable bushing for the electronic component.

16. Housing according to claim 13, characterized in that the retaining profile (26) has a receiving slot (31) and a latching edge (32) arranged parallel thereto with an inlet slope (33), between which the top-hat rail can be locked.

17. Housing according to claim 16, characterized in that a retaining clamp (34) for the top-hat rail is arranged in the receiving slot (31).

18. Device according to claim 1, wherein: the housing is or integral construction and has a receiving space (27) for the electronic component; the housing is formed from a conductive material, in particular aluminum or an aluminum alloy; the receiving space (27) has an opening (12) which forms a cable bushing for the electronic component; the housing includes a retaining profile (26) having a receiving slot (31) and a latching edge (32) arranged parallel thereto with an inlet slope (33), between which a top-hat rail can be locked; and a retaining clamp (34) for the top-hat rail is arranged in the receiving slot (31).

Description

[0036] The invention is explained in more detail below using an exemplary embodiment with reference to the attached schematic drawings, wherein:

[0037] FIG. 1 shows a perspective view of a device for temperature control in potentially explosive areas according to an exemplary embodiment according to the invention;

[0038] FIG. 2 shows a section through the device according to FIG. 1;

[0039] FIG. 3 shows a perspective view of the temperature controller according to FIG. 1 with connected electrical cables;

[0040] FIG. 4 shows a section through the housing according to FIG. 1 without installations;

[0041] FIG. 5 shows a rear view of the device according to FIG. 1 with a top-hat rail attached to the device, and

[0042] FIG. 6 shows a side view of the device according to FIG. 1 with a top-hat rail attached to the device.

[0043] The device for temperature control, as shown in FIGS. 1 and 2, is intended for use in potentially explosive areas in which temperature measurement is to be carried out, for example, in a flammable gas atmosphere or in a dust-laden environment. The device is therefore sealed against gases or dust.

[0044] For this purpose, the device has a temperature controller 10, which is arranged in a housing 11. Housing 11 has an opening 12 through which electrical lines 13, 14 of temperature controller 10 are guided to the outside. Opening 12 is sealed in a manner known per se so that gases or other substances cannot enter the housing. Opening 12 is sealed by a strain relief device 23, which is screwed into opening 12 or otherwise connected to it. The connection between the strain relief device 23 and the housing 11 is sufficiently tight to be used in hazardous areas. In particular, the connection complies with valid ATEX standards.

[0045] Housing 11 has an internal bore which forms a cavity or receiving space 27 for the temperature controller 10. The temperature controller 10 is rotationally symmetrical, in particular essentially cylindrical, so that it fits into the cavity. In general, the shape and size of the temperature controller 10 and the shape and size of the receiving space 27 are coordinated in this way. The temperature controller does not necessarily have to be round. Angular temperature controllers are also possible.

[0046] For the control of an appliance, e.g. a heater, by the temperature controller, the latter is connected in a manner known per se to electrical lines 13, 14, which are routed to the outside through opening 12 and the device for the strain relief 23. The electrical lines 13, 14 are sheathed. Specifically, the electrical lines 13, 14 are connected to corresponding contact connections located on a first end face 20 of the temperature controller.

[0047] The electrical lines 13, 14 are connected to a bimetal switch (not shown), which is located inside the temperature controller 10 and forms the temperature sensor of the temperature controller. As can be seen well in FIG. 2, the temperature controller 10 has a measuring surface 15. The bimetal switch is located behind measuring surface 15 inside the temperature controller.

[0048] During operation of the temperature controller 10, a heat flow is transported through the measuring surface 15 into its interior, i.e. to the bimetal switch, which closes or opens when the switching point is exceeded. The measuring surface 15 is formed on a second end face of the temperature controller 10. As can be clearly seen in FIG. 2, the area of the measuring surface 15, which forms the second end face of the temperature controller 10, is directly connected to an inner wall 16 of the housing 11 and rests against it. This improves the heat transfer from the temperature controller 10 to the housing and vice versa.

[0049] Direct contact means on the one hand a direct abutment without intermediate layers, so that the measuring surface 15 directly touches the inner wall 16. On the other hand, a combination of the measuring surface 15 with the inner wall 16 by means of heat conducting paste and/or heat conducting plates is also understood as direct contact, because this is a materially bonded connection between measuring surface 15 and inner wall 16, which causes a good heat transfer.

[0050] The measuring surface 15 is not only limited to the front side of the temperature controller 10, but forms a peripheral ring which is arranged concentrically to a side wall 19 of the temperature controller. In other words, the measuring surface 15 forms a front cap or hood that surrounds the wall of the temperature controller 10 at least in certain areas. The annular section of the measuring surface and the straight, end face section of the measuring surface 15 are connected integrally to each other.

[0051] As can be seen in FIGS. 2, 3, the device has an earthing tab 17 which is electrically connected to the measuring surface 15. The earthing tab 17 is connected concretely to the annular section of the measuring surface 15. This can be produced by a soldered, welded, glued connection or in one piece. As can clearly be seen in FIG. 3, the earthing tab 17 extends parallel to the side wall 19 of the temperature controller 10 and thus along the side wall 19. The earthing tab 17 rests against the side wall 19 and projects over the end face 20 of the temperature controller 10. The free end 21 of the earthing tab 17 is angled inwards, i.e. towards the temperature regulator 10 and forms a fork for receiving the further electrical line 18. As can be seen further in FIGS. 2, 3, the measuring surface 15, specifically the annular section of the measuring surface 15, forms a shoulder 22, which merges into the earthing tab 17 and is thus electrically connected to it. This is a direct fixed connection with the electrically conductive contacts.

[0052] The above-mentioned connection of the earthing tab 17 with the measuring surface 15 enables direct contact of the measuring surface 15, specifically of the front section of the measuring surface 16 with the inner wall 16 of the housing 11. For this purpose, the temperature controller 10 is subjected to a contact pressure. In the simplest case, this is generated by lines 13, 14, 18, which have an excess length between the strain relief device 23 and the end face 20 of the temperature controller 10, so that lines 13, 14, 18 press the temperature controller 10 against the inner wall 16. Alternatively or additionally a compression spring can be used. Furthermore, a materially bonded connection between the temperature regulator 10 and the inner wall 16 of the housing 11 is possible by means of a heat conducting paste or a heat conducting plate.

[0053] Housing 11 is disclosed and claimed both in connection with the temperature control device, i.e. in combination with the temperature controller 10 arranged in housing 11.

[0054] In addition, housing 11 is disclosed and claimed as such, i.e. without the temperature controller 10 arranged in housing 11, since housing 11 is also suitable as such for accommodating other electronic components as temperature controllers. The section of housing 11 is shown in FIG. 4. The housing 11 shown in FIG. 4 and the following explanations in connection with the housing 11 are also revealed in connection with the device for temperature control in potentially explosive areas. FIGS. 1 to 6 concern one and the same housing.

[0055] The housing 11 is made of a conductive material, which limits the risk of electrostatic charging of the housing 11. In concrete terms, the housing is made of aluminum or an aluminum alloy.

[0056] As can be clearly seen in the section according to FIG. 4, the housing 11 is in one piece. This means that the housing 11 is not assembled from several individual parts, but forms a single monolithic component with continuous walls. This applies not only to the plane of intersection shown in FIG. 4, but also to the entire housing 11.

[0057] Housing 11 has a receiving space 27 in which the temperature controller, as shown in FIG. 2 for example, or another electronic component can be arranged. The receiving space 27 is designed as cylindrical blind holes. Other embodiments are possible.

[0058] Receiving space 27 has an opening 12, which is formed on the underside 28 of housing 11. On the one hand, opening 12 provides access to the receiving space for mounting the temperature controller 10. On the other hand, after mounting the temperature controller 10, the strain relief device 23 is inserted, in particular screwed, which seals opening 12 against the environment, so that opening 12 forms a cable bushing.

[0059] Alternatively, a sealing compound can be used to seal opening 12.

[0060] The retaining profile 26 is used to connect the housing 11 to a top-hat rail, as shown in FIGS. 5, 6. For this purpose, the retaining profile 26, as shown in FIGS. 1, 2 and 6, has a receiving slot 31 and a latching edge 32 arranged parallel to the receiving slot 31. The receiving slot 31 and the latching edge 32 extend essentially parallel to the underside 28 of the housing 11. The latching edge 32 is connected to an inlet slope 33, at which the lower edge of the top-hat rail is guided when the housing 11 is clipped in. The top-hat rail is guided over the latching edge 32 and engages in the gap between the latching edge 32 and the rear wall 35 of the housing 11, as shown in FIGS. 5, 6.

[0061] A retaining clamp 34 or holding clamp or tension spring or spring clip is arranged in the receiving slot 31, which rests against the bottom of the receiving slot 31 on the one hand and against the top-hat rail on the other. The retaining clamp 34 is used to latch the housing 11 with the top-hat rail when the top-hat rail is guided over the latching edge 32. The retaining clamp 34 is compressed during locking and thus allows overcoming the latching edge 32. If the latching edge 32 is arranged in the gap between the rear wall 35 and the latching edge 32, the retaining clamp 34 exerts a spring force on the top-hat rail, which securely fixes the housing 11 with it.

[0062] A groove 29 is formed on the underside 28 of the housing 11, which has an internal toothing 30. Groove 29 extends parallel to the underside 28 over the entire width of the housing 11 and serves to hold a retaining screw 36, as shown in FIGS. 2 and 6. The retaining screw 36 is used to connect the housing 11 to an earthing cable. The retaining screw 36 can be moved laterally in the groove 29.

[0063] The housing has screw openings 37A, 37B at the rear for lateral mounting. Another opening, in particular a borehole 39, is provided on the rear side of the housing for standard screw mounting.

[0064] The housing 11 is manufactured as follows.

[0065] The basic shape of the housing 11 is formed by extrusion. A solid housing block is produced with the outer profile shown in FIG. 1. The outer profile comprises the retaining profile 26 at the rear side 25 of the housing 11, a curved surface at the front 24 and the groove 29 with the internal toothing. The cavity 37 at the rear side 25 of the housing 11 is also formed during extrusion.

[0066] The receiving spaces 27 are inserted into the solid, strand-shaped housing block at the underside 28, for example by drilling. Then the housing block is cut to length, i.e. cross-cut. This results in several housings, one of which is shown in FIGS. 1 to 6.

[0067] All edges and surfaces of the housing 11 extend in the direction of extrusion, i.e. also the latching edge 32, the inlet slope 33, the receiving slot 31 and the groove 29. Only the side surfaces 38 of the housing 11, which are created during transverse cutting, and the receiving space 27 are oriented in a different direction, since these are not formed during extrusion.

[0068] The receiving spaces 27 can be inserted individually into the housing block before cross-cutting or after cross-cutting. As shown in FIG. 4, in the illustrated exemplary embodiment, each housing has a single receiving space 27.

LIST OF REFERENCE NUMERALS

[0069] 10 Temperature controller [0070] 11 Housing [0071] 12 Opening [0072] 13, 14 Electrical lines [0073] 15 Measuring surface [0074] 16 Inner wall [0075] 17 Earthing tab [0076] 18 Further line [0077] 19 Side wall [0078] 20 End face [0079] 21 Free end [0080] 22 Shoulder [0081] 23 Strain relief device [0082] 24 Front side [0083] 25 Rear side [0084] 26 Retaining profile [0085] 27 Receiving spaces [0086] 28 Underside [0087] 29 Groove [0088] 30 Internal toothing [0089] 31 Receiving slot [0090] 32 Latching edge [0091] 33 Inlet slope [0092] 34 Retaining clamp [0093] 35 Rear wall [0094] 36 Retaining screw [0095] 37 Cavity [0096] 37A, 37B Lateral screw fastening [0097] 38 Side surfaces [0098] 39 Borehole for standard screw fastening