EP2182584A1

EP2182584A1 - Connector for a coaxial thermocouple

Info

Publication number: EP2182584A1
Application number: EP09382235A
Authority: EP
Inventors: Marcos Pablo Curto; Jakes López Godoy; Juan Herzog Delgado; Jose Mari Lasa Elexpuru
Original assignee: Orkli SCL
Current assignee: Orkli SCL
Priority date: 2008-11-04
Filing date: 2009-11-02
Publication date: 2010-05-05
Also published as: ES1069053Y; ES1069053U; BRPI0904657A2; AR073976A1

Abstract

Connector for a coaxial thermocouple adapted for its connection to an electromagnetic gas valve, the coaxial thermocouple comprising a phase conductor (2) and an earth conductor (3) surrounding the phase conductor (2). The connector comprises a phase terminal (4) which is fixed to one end of the phase conductor (2), the phase terminal (4) being a female terminal, an earth terminal (5) which is fixed at one end to the earth conductor (3) surrounding the phase terminal (4), and an insulating member (6) inside which is fixed the phase terminal (4). The insulating member (6) is housed at least partially inside the earth terminal (5).

Description

TECHNICAL FIELD

The present invention relates to a connector for a coaxial thermocouple, also known as a tubular thermocouple, designed for its connection to an electromagnetic gas valve.

PRIOR ART

Coaxial or tubular thermocouples comprising a phase conductor and an earth conductor axially disposed, with the earth conductor surrounding the phase conductor are known. These types of thermocouples are more robust and offer a better connection and heat evacuation than two-wire thermocouples, which comprise a phase conductor and an earth conductor that are separate from each other. Because of this, coaxial or tubular thermocouples are more suitable for domestic applications such as hob burners, ovens, etc.
Said coaxial thermocouple is generally connected to an electromagnetic safety valve by means of a threaded part, as disclosed in DE29609887U1 , which is fixed to the end of the conductors of the thermocouple with the result that the earth conductor is connected to the threaded part, thereby maintaining electrical continuity. The phase conductor is insulatelly housed inside said threaded part, said phase conductor coming into contact with the terminal of the electromagnetic valve when the threaded part is attached to the electromagnetic valve
As well as making the product significantly more expensive, this threaded assembly solution clearly slows down the assembly process and even hampers it on occasions due to the difficulty of accessing the connection area.
ES1023977U describes a fast coupling for a coaxial or tubular thermocouple that comprises an electrically conductive bushing that is fitted on to the free end of the tube and has at least one radial projection that cooperates with a mouth disposed in the body of the valve, thereby creating a bayonet-type connection between both.

BRIEF DISCLOSURE OF THE INVENTION

It is an object of this invention to provide a connector for a coaxial thermocouple adapted for its connection to an electromagnetic gas valve as defined in the claims.
The coaxial thermocouple comprises a phase conductor and an earth conductor surrounding the phase conductor. The connector of the coaxial terminal also comprises a phase terminal that is fixed to one end of the phase conductor, the phase terminal being a female terminal, an earth terminal fixed at one end to the earth conductor surrounding the phase terminal, and an insulating member inside which is fixed the phase terminal, the insulating member being housed at least partially inside the earth terminal.
As a result, a robust quick-fit connector for a coaxial or tubular thermocouple is thus obtained, being designed for its connection to electromagnetic valves when they include a male connector without needing intermediate members. This removes the need to use threaded members that make the end product significantly more expensive, thereby making the assembly of said connector to the corresponding electromagnetic valve easier thanks both to the simplicity of said quick-fit connector and to the speed of its assembly/connection. This type of quick-fit connector may even be connected in areas of reduced size that are difficult for the user to access, thereby improving productivity in its assembly.
These and other advantages and characteristics of the invention will be made evident in the light of the drawings and the detailed description thereof.

DESCRIPTION OF THE DRAWINGS

Figure 1 is a longitudinal section of a coaxial connector for a coaxial flame detection thermocouple according to the invention.
Figure 2 is a lateral view of the coaxial connector shown in Figure 1.

DETAILED DISCLOSURE OF THE INVENTION

Figure 1 shows a coaxial connector 1 of a coaxial flame detection thermocouple fitted to an electromagnetic gas valve, according to the invention, with the coaxial thermocouple comprising a phase conductor 2 and an earth conductor 3 surrounding the phase conductor 2 externally.
The coaxial connector 1 comprises an electrically conductive phase terminal 4 that is fixed to one end of the phase conductor 2, an electrically conductive earth terminal 5 that is fixed at one end to the earth conductor 3 surrounding the phase terminal 4, and an insulating member 6, preferably made of plastic, inside which is fixed the phase terminal 4, the insulating member 6 being housed at least partially inside the earth terminal 5.
The insulating body 6, which is substantially cylindrical and hollow, has a first axial housing 9b through which is inserted the phase conductor 2 and a second axial housing 9a, continuous and coaxial to the first axial housing 9b, that has a diameter greater than the diameter of the first housing 9b. The phase terminal 4 also comprises at least one elastic tongue member 7 that projects radially out of said phase terminal 4, the tongue member 7 expanding inside the second housing 9a when the phase terminal 4 is housed in the second housing 9a, thereby preventing any accidental disassembly as the tongue member 7 comes up against a base surface 9c of the second housing 9a, thereby fixing the phase terminal 4 to the insulating member 6.
In addition, the insulating body 6 comprises a first segment 6a that is inserted tightly inside the earth terminal 5 and inside which the first axial housing 9b is disposed, and a second segment 6b concentric and continuous to the first segment 6a, inside which the second axial housing 9a is disposed, said second segment 6b including equidistantly disposed axial slots 12, which make the second segment 6b more flexible, the purpose being to make it easier to insert in the electromagnetic valve, which is not shown in the figures.
Additionally, the earth terminal 5 has a substantially cylindrical shape with one end 5b that is fitted concentrically to the outside of the earth cable 3 of the coaxial thermocouple, said earth cable 3 being fixed to the end 5b by means of connection means 11. In the embodiment of the invention described herein, the earth cable 3 is fixed to the end 5b by means of welding 11, but in other embodiments not shown in the figures, the earth cable 3 may be fixed to the end 5b by means of other fixing means such as sticking, riveting or stapling by means of a clamp, clips etc. In addition, the end 5b does not have to be cylindrical, as shown in Figures 1 and 2, and may have a shape designed to collaborate with the corresponding fixing means for the correct fixing of the end 5b and the earth cable 3, such as a tapered shape, for example.
As shown in Figure 2, the earth terminal 5 comprises axial grooves 8 that have a first part 8a defined by a width d1 and a second part 8b defined by a width d2, the second width d2 being greater than the first width d1.
The insulating member 6 also includes at least one external radial projection 10 on the first segment 6a, the projection 10 being defined by a width d3 greater than at least the width d1 of the first part 8a, the projection 10 being housed in the second part 8b of the groove 8, thereby fixing the insulating member 6 to the earth terminal 5.
Finally, by means of the coaxial connector 1 the user may easily identify the type of thermocouple to which said coaxial connector 1 is connected, thereby differentiating it from any other type of connector. Identification is based on the differentiation by colours of the insulating body 6.

Claims

Connector for a coaxial thermocouple adapted for its connection to an electromagnetic gas valve, the coaxial thermocouple comprising a phase conductor (2) and an earth conductor (3) surrounding the phase conductor (2), characterised in that it comprises a phase terminal (4) which is fixed to one end of the phase conductor (2), the phase terminal (4) being a female terminal, an earth terminal (5) which is fixed at one end to the earth conductor (3) surrounding the phase terminal (4), and an insulating member (6) inside which the phase terminal (4) is fixed, the insulating member (6) being housed at least partially inside the earth terminal (5).
Connector for a coaxial thermocouple according to the preceding claim, wherein the insulating member (6) comprises a first axial housing (9b) through which a phase conductor (2) is inserted and a second axial housing (9a), continuous and coaxial to the first axial housing (9b), that has a diameter greater than the diameter of the first housing (9b), and the phase terminal (4) comprises at least one tongue member (7) that projects out of said phase terminal (4), the tongue member (7) expanding inside the second housing (9a), thereby fixing the phase terminal (4) to the insulating member (6).
Connector for a coaxial thermocouple according to any of the preceding claims, wherein the phase terminal (4) is housed completely inside the insulating member (6).
Connector for a coaxial thermocouple according to any of the preceding claims, wherein the earth terminal (5) is fixed concentrically to the earth cable (3) by means of connection means (11).
Connector for a coaxial thermocouple according to any of the preceding claims, wherein the earth terminal (5) is substantially cylindrical and includes at least one axial groove (8) that has a first part (8a) defined by a width (d1) and a second part (8b) defined by a width (d2), the second width (d2) being greater than the first width (d1) of the first part (8a), and the insulating member (6) is substantially cylindrical and includes at least one radial projection (10) defined by a width (d3) greater than at least the width (d1) of the first part (8a), the projection (10) being housed in the second part (8b) of the groove (8), thereby fixing the insulating member (6) to the earth terminal (5).