CN1646861A

CN1646861A - Thermocouple safety device particularly for gas burnes

Info

Publication number: CN1646861A
Application number: CNA038081601A
Authority: CN
Inventors: 达尼埃莱·马丁
Original assignee: OMVL SRL
Current assignee: OMVL SRL
Priority date: 2002-04-11
Filing date: 2003-02-03
Publication date: 2005-07-27
Also published as: WO2003085324A1; EP1492983A1; MXPA04009813A; AU2003215888A1; ITPD20020092A1; BRPI0309241A2

Abstract

A thermocouple safety device, particularly for gas burners, comprises a phase conductor (3) and an earth conductor (4) of the thermocouple, each carrying a respective terminal (3a, 4a) for electrical connection to an electromagnetic unit (5) for controlling the opening/closure of a valve seat for the supply of the gas to the burner, as well as a tubular body (6) for housing the magnetic unit, from which body a collar-like element (7) extends coaxially along an axial axis (X). The device further comprises, at the free end (4a) of the earth conductor (4), a resiliently deformable connection element (11) which can be coupled with the collar-like element, transversely relative to the axial axis, for the restraint of the thermocouple relative to the tubular body of the device.

Description

Be used in particular for the thermocouple safety device of gas burner

Technical field

The present invention relates to a kind of thermocouple safety device, specifically be used for gas burner as described in the preamble as main claim 1.

Background technology

Described this thermocouple assembly is widely used in the flow of gas in the burner that is controlled at common indoor heating boiler, the cooking frame, gas burner and all similar devices.This equipment has a steam supply valve usually, and its opening/closing is controlled by an electromagnetic unit, and this electromagnetic unit is connected with thermocouple, so that guarantee the valve safety cut-off under the situation that the flame accident in burner is extinguished.Usually, be used for by electromagnetic attraction and overcome the cover part of valve is remained in the open position by the potential difference that thermocouple produces owing to contact, thereby guarantee cover part safe closure under fireless situation with the biasing force that has elastic characteristic usually with flame.

Knownly by screw thread coupling the contact terminal of thermocouple is installed on the valve body of valve unit, these contact terminals are made of phase conductor and earth lead usually.Because this system need use the instrument that is used to carry out the attaching/detaching operation, so find that this system is particularly inconvenient; And owing to screw thread coupling may relax, so this system is unreliable.

The mode of also known quick sucking fit connector by being used for phase conductor and earth lead is installed these contact terminals.From European patent No.619460, can know an example of device with these features.This Patent publish, a pair of axial sucking fit connecting element is set on the valve body of valve unit and corresponding a pair of sucking fit connecting element is set on thermocouple terminal, thereby, this thermocouple is installed thus by phase conductor and the sucking fit of earth lead rapid axial are connected on the valve body.

Summary of the invention

Main purpose of the present invention is to improve the connection tight ness rating between terminal and valve unit, especially guarantee to improve the axial locking of thermocouple terminal aspect the disengagement, still guarantee to carry out very apace the installation and removal operation of this thermocouple simultaneously with respect to valve unit at these leads.

This that to understand from the following describes and other purpose realize according to the thermocouple safety device that claims form by utilization of the present invention.

Brief description of drawings

To understand these feature and advantage of the present invention more the following detailed description of the preferred embodiment of the invention that illustrates in the mode of non-limiting examples from the reference accompanying drawing, wherein:

Fig. 1 is the partial, exploded perspective view according to thermocouple safety device of the present invention;

Fig. 2 is the localized axial section that runs through Fig. 1 device that is in the state of assembling;

The part section of Fig. 3 for cutting open along the III-III line of Fig. 2;

Fig. 4 is partly cut-away's side front view of the device of earlier drawings; And

Fig. 5 is the localized axial section that runs through according to the modification of device of the present invention.

Detailed description of preferred embodiments

With reference to above-mentioned accompanying drawing, the safety device of the present invention with thermocouple 2 that is used for the gas burner (not shown) is substantially by 1 expression.

Be schematically shown as Fig. 2, the thermocouple 2 of this device comprises a phase conductor 3 and an earth lead 4, and each has

corresponding terminal

3a, 4a at the respective end portions place, is used for being electrically connected with electromagnetic unit 5.

Electromagnetic unit 5 is contained in the tubular body 6 of this device, is formed with air feed valve seat (not shown) in main body 6 in a conventional manner; This valve seat is connected with corresponding cover part (also not shown), and the opening/closing of this cover part is controlled in a conventional manner by the magnet of electromagnetic unit 5, and this mode is not a theme of the present invention.

Collar-like element 7 is coaxially extended along axial axis X from tubular body 6, and preferably is connected by the axial end portion of screw thread coupling with main body 6.

This collar-like element 7 portion within it can be held a head 8, and this head 8 is made by insulating materials and is formed with two to have cylindrical surface and extend axially major parts as each other extension.This head 8 still is hollow in the axial direction, so that portion holds machinery and is electrically connected to the quick sucking fit connector 9 of female type on the terminal 3a of phase conductor 3 within it, this connector 9 axially sucking fit in the axial cavity of collar-like element 7 from main body 6 on the coaxial corresponding plug connector 10 that stretches out and be electrically connected with electromagnetic unit.

From following explanation as can be seen, earth lead 4 its terminal 4a place be connected by the connectors of 11 expressions substantially, this connector can strain and can be connected with collar-like element 7.

Connector 11 preferably constitutes a Flexible clamp, and it comprises a pair of

relative arm

12,13, and they can elasticity launch and pass through tabular join domain 14 to connect.

These

arms

12,13 extend segment distances, thus they since clip along the direction of the arrow F of Fig. 1 with respect to the axis X transverse movement and the radially part relatively of the outer surface of grip flange 7.

More particularly, each

arm

12,13 bending of clip have at least one

appropriate section

12a, 13a with the corresponding arcuate profile of circumference profile (having identical radius of curvature) of flange 7 with formation, thereby when being assembled together, the arm elasticity of clip is launched, these

parts

12a, 13a are bonded on the appropriate section of flange 7 by the clip snap fit on flange then, transversely retrain these clips with longitudinal direction with respect to main body 6 so that guarantee.Should be noted that in this case, axial constraint (along axis X) mainly depends on the skin-friction force between the outer surface of

arm

12,13 and flange 7 that produces in the strain during its snap fit by clip.Should also be noted that these

arms

12,13 so are shaped, thereby therefore the shape of mating flanges 7 basically makes and is in contact with one another the area maximum, thereby form bigger mutual effect of contraction between the parts that are assembled together.

Clip shape Connection Element 11 and collar-like element 7 are preferably made by conductive material, thereby guarantee that earth lead 4 is electrically connected with electromagnetic unit 5.In order to improve the axial locking of thermocouple 2, auxiliary axial restraint means is set alternatively in addition also with respect to this device main body 6.These parts comprise the projection 15 that the end right-angle bending by the plate like region 14 that makes clip forms, it can be when clip 11 snap fit be on flange be formed on flange 7 in circumferential groove 16 engage.This groove 16 is preferably by limiting from collar-like element 7 and the tubular body 6 extended

shoulder surfaces

17,18 of facing respectively.This projection 15 has a circular recessed portion 15a, is applicable to the cylindrical surface of the substrate of groove 16 to cooperate, so that improve carrying contact mutually.

Clip 11 can also comprise one second projection 19, it also preferably by be positioned at away from the place, side of projection 15 and along the direction identical join domain 14 met at right angles with projection 15 bending forms.Should be noted that, projection 19 has the circular recessed portion 19a that is similar to recessed portion 15a shape, applicable to improve projection at head 8 near the carrying on the outer surfaces of its shoulder 8c, so that for example because the unexpected disengagement of phase conductor causes head shaft to stop this shoulder during sliding off main body 6.Employing projection 19 helps the terminal 4a mechanical connection of earth lead 4 (for example welding) and is electrically connected on the clip 11.

In the modification shown in Fig. 5, form head 8 by hardening process, this process also form can with projection 19 circumferential grooves that are bonded with each other 20, with convenient clip 11 snap fit on collar-like element 7 time axial two-way effect of contraction on head 8.

In operation, the installation of thermocouple comprises: at first will by with

connector

9,10 axially fast sucking fits connect phase conductor 3, subsequently by moving snap fit clip 11 along the direction perpendicular to axial direction of the direction of the arrow F of Fig. 1; This assembly method has been guaranteed to have guaranteed the electrical connection of earth lead 4 simultaneously with respect to the terminal of the

lead

3,4 of tubular body 6 axial constraint thermocouples.

On the contrary,, must at first Flexible clamp 11 be removed (so that throwing off), axially make the quick sucking fit of phase conductor 3 connect disengagement then with earth lead 4 from collar-like element 7 in order to remove this thermocouple 2.

Therefore the present invention has realized the target that proposes, thereby has many known solution party that are better than The advantage of case.

Should comprise that among these advantages the quick sucking fit by phase conductor connects alone Thereby improved the axial locking of thermocouple. One of them major advantage is, utilizes this device The finite population lateral dimension guaranteed the quickly and easily connection of thermocouple.

Claims

1. thermocouple safety device (2) that is used in particular for gas burner, it comprises:

The phase conductor (3) of thermocouple (2) and earth lead (4), each lead all have the respective terminal that is used for being electrically connected with electromagnetic unit (5) (3a, 4a), this electromagnetic unit (5) is used for the opening/closing of control valve seat so that give the burner air feed;

One tubular body (6), be used to hold this electromagnetic unit, one collar-like element (7) is coaxially extended from described main body along axial axis (X), it is characterized in that, this device comprises that at the free end of earth lead one can be with respect to the Connection Element (11) of axial axis transverse elasticity distortion, this Connection Element can be connected with collar-like element (7), so that retrain this thermocouple with respect to the tubular body of this device.

2. device as claimed in claim 1, wherein said Connection Element (11) comprises at least one clip, it can be clipped in the relative part of collar-like element (7) between the arm (12,13) of this clip.

3. device as claimed in claim 2, each arm (12 wherein, 13) comprise that at least one has the part (12a with the corresponding profile of profile of flange portion, 13a), thereby when being assembled together, the arm elasticity of this clip is launched, and is bonded on the respective flanges part by snap fit then, and this has guaranteed axially and retrain this clip with respect to tubular body in a lateral direction.

4. device as claimed in claim 3, (12a, 13a) its shape of corresponding profile with flange portion matches the part of wherein said arm basically.

5. device as claimed in claim 4, wherein said collar-like element (7) has circular cross section, and the part of these arms has its radius of curvature and the corresponding arcuate profile of flange.

6. as one in the claim of front or multinomial described device, wherein Connection Element (11) and collar-like element (7) are made by conductive material, thereby guarantee that earth lead (4) is electrically connected with electromagnetic unit (5).

7. as one in the claim of front or multinomial described device, comprise being located at first accessory that is used for the axial constraint thermocouple between tubular body and the Connection Element.

8. device as claimed in claim 7, the wherein said first auxiliary axial restraint means comprises at least one projection (15), and it extends from Connection Element and can engage with the corresponding recesses (16) in being formed on tubular body when the clip snap fit is on collar-like element.

9. device as claimed in claim 8, wherein said groove (16) is by limiting in the face of shoulder surface (17,18) mutually from collar-like element and tubular body are extended respectively.

10. as one in the claim of front or multinomial described device, it comprises the terminal (3a) that is positioned at phase conductor (3) and the quick sucking fit attaching parts between the electromagnetic unit (5).

11. device as claimed in claim 10, it comprises by insulating materials makes and can be inserted in axial hollow head (8) in the collar-like element (7), described quick sucking fit attaching parts comprise the female type connector (9) and the plug connector (10) of axial engagement mutually, and female type connector and plug connector are electrically connected with the magnet of the electromagnetic unit (5) of the phase conductor (3) of thermocouple and this device respectively.

12. device as claimed in claim 11 comprises being located at second accessory that is used for the axial constraint thermocouple between head (8) and the Connection Element (11).

13. device as claimed in claim 12, wherein said second axial restraint means comprise second projection (19) that is positioned on the Connection Element (11), it can be when Connection Element be connected with collar-like element and the effect of the shoulder (8c) of head (8).

14. device as claimed in claim 12, wherein said second axial restraint means comprises second groove (20) that is positioned on the head (8) and is positioned at corresponding second projection (19) on the Connection Element (11) that they can be bonded with each other when Connection Element is connected with collar-like element.