CN221840587U - Armored thermocouple switching structure - Google Patents

Abstract

The utility model relates to the technical field of armored thermocouples, in particular to an armored thermocouple switching structure. An armored thermocouple switching structure comprises a switching shell, wherein a cavity is arranged in the switching shell; a metal pipe is arranged on one side of the switching shell, and the pipe cavity of the metal pipe is communicated with the cavity; the device also comprises an armored thermocouple and a sleeve, wherein the armored thermocouple at least comprises a first section and a second section, and at least part of the second section is in contact with the inner wall of the pipe cavity of the metal pipe; and moreover, the outer wall of the sleeve is welded and connected with the inner wall of the metal tube, and the inner wall of the sleeve is welded and connected with the outer surface of the armor of the armored thermocouple. In the utility model, a sleeve is added between the thermode and the outer shell, the outer wall of the sleeve is connected with the metal pipe in a welding way, the inner wall of the sleeve is connected with the outer surface of the armor material of the armored thermocouple in a welding way, namely, the armored thermocouple and the metal pipe are fixedly connected through the sleeve, and the metal pipe is arranged and fixed on the switching shell, so that the fixed connection between the armored thermocouple and the switching shell is realized.

Description

Armored thermocouple switching structure

Technical Field

The utility model relates to the technical field of armored thermocouples, in particular to an armored thermocouple switching structure.

Background

The armored thermocouple sensor is used for measuring high-temperature fuel gas in the combustion chamber of the aeroengine, the sensor is arranged on the engine exhaust casing, the vibration magnitude often reaches more than 20g, and the insulation resistance requirements are all more than 100MΩ. In order to meet the signal acquisition requirement, the tail part of the armored thermocouple component is required to be connected with a compensation cable with different lengths, and is connected through the switching component.

Patent document CN202223555818.9 discloses an armored thermocouple junction structure, wherein it is mentioned that the armored thermocouple junction structure comprises an outer shell, the outer shell is provided with a thermode channel, a containing cavity is formed, the thermode channel is communicated with the containing cavity, one end of a thermode with a coupling wire passes through the thermode channel, the thermode is inserted into the containing cavity from one end of the containing cavity, an electrode lead is inserted into the containing cavity from the other end of the containing cavity, the coupling wire and the electrode lead which are positioned in the containing cavity are connected with each other by welding, and finally glass blank is filled in the containing cavity.

The connection mode widely adopted in the prior art has certain disadvantages, for example, in order to facilitate one end of the hot electrode to pass through the hot electrode channel, the outer surface of the hot electrode and the hot electrode channel are in clearance fit, namely, the outer surface of the hot electrode and the hot electrode channel are not fixed, so that the hot electrode vibrates in the hot electrode channel after being subjected to higher vibration magnitude in the use process of the armored thermocouple sensor, the vibrating hot electrode is easy to apply certain shearing stress to glass blank, and the breakage risk of the glass blank is increased.

In summary, the core technical problem in the prior art is how to fix the thermode and the casing to each other.

Disclosure of utility model

Aiming at the technical problem of how to mutually fix a hot electrode and a shell body in the prior art, the utility model provides an armored thermocouple switching structure.

The utility model is realized by the following technical scheme:

An armored thermocouple switching structure comprises a switching shell, wherein a cavity is arranged in the switching shell; a metal pipe is arranged on one side of the switching shell, and the pipe cavity of the metal pipe is communicated with the cavity;

The device also comprises an armored thermocouple and a sleeve, wherein the armored thermocouple at least comprises a first section and a second section, and the first section is provided with a coupling wire; the first section is penetrated through the sleeve, the coupling wire stretches into the cavity, and at least part of the second section is contacted with the inner wall of the cavity of the metal tube;

and moreover, the outer wall of the sleeve is welded and connected with the inner wall of the metal tube, and the inner wall of the sleeve is welded and connected with the outer surface of the armor of the armored thermocouple.

Further, a widening channel is formed in the metal tube, the widening channel is located at one end of the metal tube facing the cavity, and the sleeve is arranged in the widening channel.

Further, the switching shell is provided with an upper hole, the cavity is positioned between the upper hole and the metal tube, and the hole axis of the upper hole coincides with the axis of the metal tube or a first interval exists.

Further, the switching shell is provided with a left hole, and the hole core line of the left hole is perpendicular to the hole core line of the upper hole; the switching shell is also provided with a right hole, the hole core line of the right hole is coaxial with the hole core line of the left hole, or the right hole core line and the left hole core line are parallel to each other and have a second interval, and the cavity is positioned between the left hole and the right hole and is respectively communicated with the left hole and the right hole;

Also comprises a cable, one end of the cable is provided with a metal wire core, the outer surface of the cable is provided with a metal layer; one end of the cable with the metal wire core penetrates through the left hole, and the metal wire core is positioned in the cavity;

The bushing extends into the cavity from the right hole and is sleeved outside the cable; the bushing comprises a fixing pipe and a pressing pipe, the pressing pipe is fixedly connected with the metal layer in a pressed mode, the fixing pipe is sleeved on the outer surface of the cable, a gap exists between the fixing pipe and the outer surface of the cable, and the fixing pipe is fixedly welded with the switching shell.

Further, be provided with first locating surface on the fixed pipe, the cavity inner wall is provided with the second locating surface, and first locating surface and second locating surface all are acute angle, right angle or obtuse angle setting with the extending direction of cable, and first locating surface and second locating surface contact each other.

Further, the metal wire core is stripped from one end of the cable and leaks out from one end of the cable;

The metal layer includes: the cable comprises a metal braiding layer reversely wrapped on the outer surface of the cable and leaked from the cable stripping head, and metal wires wound outside the metal braiding layer.

Further, the cable further comprises a plurality of first reinforcement pipes, wherein any one of the first reinforcement pipes wraps one of the metal wire cores of the cable;

the thermocouple also comprises a plurality of second reinforcing pipes, wherein any one of the second reinforcing pipes wraps one coupling wire of the armored thermocouple;

the metal wire core and the even wire are mutually corresponding in polarity and fixedly connected in the cavity by welding.

Further, the gap between the inner wall of the fixed pipe and the outer surface of the cable is filled with silicone rubber;

The right cover is used for blocking the right hole and is welded and fixed with the right hole;

the direction of the right hole is pointed at by the position of filling the silicone rubber, and epoxy glue is filled between the silicone rubber and the right hole and in the residual space of the cavity;

the upper cover is used for blocking the upper hole and is welded and fixed with the upper hole.

Further, the first reinforcement pipe and the second reinforcement pipe are respectively polytetrafluoroethylene pipes.

Compared with the prior art, the utility model has the advantages that:

1. The sheathed thermocouple of the utility model corresponds to a thermode in the background art, the composition of the switching housing and the metal tube of the utility model corresponds to an outer housing in the background art, and the lumen of the metal tube of the utility model corresponds to a thermode channel in the prior art. Compared with the prior art, the utility model has the advantages that the sleeve is additionally arranged between the composition of the switching shell and the metal tube and the armored thermocouple, the outer wall of the sleeve is welded and connected with the metal tube, and the inner wall of the sleeve is welded and connected with the outer surface of the armor material of the armored thermocouple, namely, the composition of the switching shell and the metal tube is fixedly connected with the armored thermocouple through the sleeve; therefore, the utility model solves the technical problem of how to mutually fix the hot electrode and the shell.

Drawings

FIG. 1 is a schematic view of the structure of the adaptor housing, cable, and sheathed thermocouple of the present utility model;

FIG. 2 is a schematic view of the cable and bushing assembly of the present utility model;

FIG. 3 is a schematic view of the bushing of the present utility model;

Fig. 4 is an overall cross-sectional view of the sheathed thermocouple junction structure of the utility model.

The marks in the figure: the cable comprises a switching shell (1), a cavity (2), a metal tube (3), an armored thermocouple (4), a sleeve (5), a widening channel (6), an upper hole (7), a cable (8), a metal layer (9), a bushing (10), a fixed tube (11), a crimping tube (12), a left hole (13), a right hole (14), a first positioning surface (15), a second positioning surface (16), a first reinforcing tube (17), a second reinforcing tube (18), silicone rubber (19), epoxy rubber (20), an upper cover (21) and a right cover (22).

Detailed Description

The technical scheme of the utility model is further described in non-limiting detail below with reference to the preferred embodiments and the accompanying drawings. In the description of the present utility model, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. refer to the azimuth or positional relationship based on the azimuth or positional relationship shown in the drawings. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in FIG. 1, the armored thermocouple switching structure of the preferred embodiment of the utility model comprises a switching housing 1, wherein a cavity 2 is arranged in the switching housing 1; a metal tube 3 is arranged on one side of the switching shell 1, and the tube cavity of the metal tube 3 is communicated with the cavity 2; the device also comprises an armored thermocouple 4 and a sleeve 5, wherein the armored thermocouple 4 at least comprises a first section and a second section, and the first section is provided with a coupling wire; the first section is penetrated through the sleeve 5, the coupling wires extend into the cavity 2, and at least part of the second section is contacted with the inner wall of the pipe cavity of the metal pipe 3; and, the outer wall of sleeve pipe 5 links to each other with the metal pipe 3 welding, and the inner wall of sleeve pipe 5 links to each other with the armor surface welding of armor thermocouple 4.

As shown in fig. 1, the adaptor housing 1 is a metal housing, a cavity 2 is disposed in the adaptor housing 1, and the shape of the cavity 2 may be a regular shape or an irregular shape, which is not limited herein; a metal tube 3 is disposed on one side of the adaptor housing 1, and the metal tube 3 and the adaptor housing 1 may be detachably connected or integrally formed, in this embodiment, preferably, the metal tube 3 and the adaptor housing 1 are integrally formed; preferably, the lumen of the metal tube 3 extends along a straight line; preferably, the axis of the metal tube 3 is coaxial with or parallel to the axis of the sheathed thermocouple 4; in the present embodiment, the axial direction of the metal pipe 3 is perpendicular to the axial direction of the adapter housing 1.

As shown in fig. 1, the sheathed thermocouple 4 comprises at least a first section and a second section, preferably, the first section and the second section extend along a straight line, and the first section and the second section may or may not be directly connected, and in this embodiment, the first section and the second section are directly connected; the first section has a plurality of coupling wires, the coupling wires have different polarities, and the armored thermocouple 4 has a known structure and will not be described in detail.

As shown in fig. 1, the sleeve 5 is preferably made of metal, most preferably, the sleeve material is consistent with the armor material of the armored thermocouple, and is made of high-temperature alloy GH3039, and the outer diameter of the sleeve 5 can be configured according to specific use conditions, for example, in the embodiment, the outer diameter of the sleeve is phi 5.5; preferably, in this embodiment, the outer wall of the sleeve 5 is connected to the inner wall of the metal tube 3 by means of laser welding, and in the welding process, the penetration depth is not less than 3mm by means of continuous laser welding, and the penetration depth direction is along the axial direction of the armored thermocouple component, so that the welding flux fills the gap between the outer wall of the sleeve 5 and the inner wall of the metal tube 3. Preferably, in this embodiment, the inner wall of the sleeve 5 is connected to the outer surface of the armor of the armored thermocouple 4 by a vacuum brazing welding method, and the vacuum brazing welding method is widely applied to the field of welding of the armored thermocouple, which is not described herein.

As is known from the background art, the technical problem in the prior art is how to fix the thermode and the housing to each other, i.e. how to fix the sheathed thermocouple and the adapter housing to each other.

The sheathed thermocouple of this embodiment corresponds to the thermode in the background art, the composition of the adaptor housing 1 and the metal tube of this embodiment corresponds to the housing in the background art, and the lumen of the metal tube 3 of this embodiment corresponds to the thermode channel in the prior art. In this embodiment, compared with the prior art, a sleeve 5 is added between the composition of the adaptor housing 1 and the metal tube and the armored thermocouple, the outer wall of the sleeve 5 is welded with the metal tube 3, and the inner wall of the sleeve 5 is welded with the outer surface of the armor material of the armored thermocouple 4, namely, the composition of the adaptor housing 1 and the metal tube (3) is fixedly connected with the armored thermocouple through the sleeve 5; therefore, the present embodiment solves the technical problem of how to fix the thermode and the case to each other.

Further, simultaneously, the second section of the armored thermocouple 4 is in contact with the inner wall of the pipe cavity of the metal pipe 3, the inner wall of the pipe cavity of the metal pipe 3 plays a role in radially limiting the armored thermocouple 4, and the problem that part of the armored thermocouple 4 positioned in the pipe cavity of the metal pipe 3 swings radially along the armored thermocouple 4 is avoided.

Further, as mentioned in the foregoing, the outer wall of the sleeve 5 and the inner wall of the metal tube 3 are connected by welding of laser welding, preferably, the solder fills the gap between the outer wall of the sleeve 5 and the inner wall of the metal tube 3 to form a first layer of seal; in the foregoing, it is mentioned that the inner wall of the sleeve 5 is connected to the outer surface of the armor of the sheathed thermocouple 4 by means of vacuum brazing, preferably, the solder fills the gap between the inner wall of the sleeve 5 and the outer surface of the armor of the sheathed thermocouple 4, forming a second seal.

In other prior art, combining background technology, still adopting the mode of filling magnesium oxide in holding the cavity and sealing, magnesium oxide has the characteristic of absorbing moisture, because hot electrode's surface and hot electrode passageway are clearance fit, and the steam of engine, very easily get into in the magnesium oxide through the gap between hot electrode's surface and the hot electrode passageway, lead to the insulating properties of magnesium oxide to decline, need to dismantle the shell body, can use to the magnesium oxide redrying.

In this embodiment, because the first layer of sealing that sets up between sleeve 5 and metal pipe 3 and the second layer of sealing that sets up between sleeve 5 and armoured thermocouple 4, namely in this embodiment set up the twice sealed effect between armoured thermocouple and metal pipe 3, can prevent effectively that outside steam from entering into the cavity through the gap between sleeve 5 and the metal pipe 3, or the gap between sleeve 5 and armoured thermocouple 4, guarantee the leakproofness of armoured thermocouple switching structure of this embodiment, avoided the magnesium oxide among the prior art to wet and lose sealed negative effect.

Further, in order to save the overall size of the armored thermocouple switching structure along the axial direction of the armored thermocouple, the embodiment further comprises the following technical scheme:

As shown in fig. 1, a widening channel 6 is formed in the metal tube 3, the widening channel 6 is located at one end of the metal tube 3 facing the cavity 2, and a sleeve 5 is arranged in the widening channel 6.

In particular, it is preferred that the widening channel 6 is arranged coaxially with the sleeve 5; preferably, the inner diameter of the widening channel 6 is larger than the inner diameter of the other parts of the metal tube 3 except for the widening channel 6, and the widening channel 6 is used for accommodating the sleeve 5; that is, the sleeve 5 of the present embodiment is disposed in the metal tube 3, and the axis of the metal tube 3 is coaxial with or parallel to the axis of the sheathed thermocouple, so that in the present embodiment, it is avoided that the sleeve 5 occupies other space than the lumen of the metal tube 3 along the axis direction of the sheathed thermocouple; therefore, along the axial direction of the armored thermocouple, the casing 5 is not designed in many ways, and the size of the armored thermocouple switching structure needs to be lengthened, so that the redesign of the die opening part is avoided, the production cost is saved, and the problem that the installation space is increased due to the fact that the armored thermocouple switching structure needs to be lengthened is avoided.

Further, because the armoured thermocouple has the armoured material surface, its hardness is higher, is difficult to buckle, and sleeve pipe 5 is also metalwork, is likewise difficult to buckle, wears to establish the tubular metal resonator in order to be convenient for sleeve pipe and armoured thermocouple, and this embodiment still includes following technical scheme:

As shown in fig. 1, the adaptor housing 1 is provided with an upper hole 7, the cavity 2 is located between the upper hole 7 and the metal tube 3, and the hole axis of the upper hole 7 coincides with the central axis of the metal tube 3 or has a first interval.

Most preferably, the hole axis of the upper hole 7 coincides with the central axis of the metal tube 3; less preferably, the hole core line of the upper hole 7 and the central axis of the metal tube 3 have a first interval, the first interval can be configured according to specific use conditions, and the first interval is not limited herein, but should not be too large, so that after the armored thermocouple and the sleeve 5 extend into the cavity from the upper hole 7, the armored thermocouple can smoothly extend into the cavity of the metal tube 3, and the sleeve 5 can smoothly extend into the widening channel 6. In this embodiment, the upper hole 7 coinciding with the central axis of the metal tube 3 or having a first distance is provided, so that the sleeve and the armored thermocouple penetrate through the upper hole to form the metal tube, which is more convenient.

In the foregoing, it can be seen that this embodiment solves the technical problem of how to fix the thermode and the casing to each other; further, in combination with the background technology, the electrode lead in the prior art, namely, the cable, is not fixed between the cable and the outer shell, if the cable receives a part of the cable which is not fixed by the glass blank after a higher vibration level, the cable is easy to vibrate relative to the outer shell, the vibrated cable is easy to give a certain shear stress to the glass blank, and the risk of glass blank breakage is increased. Therefore, there is also a technical problem in the prior art how the electrode lead, i.e. the cable, is fixed to the outer casing, which is solved by the following technical solution.

As shown in fig. 1 to 3, the adapter housing 1 is provided with a left hole 13, and the hole axis of the left hole 13 is perpendicular to the hole axis of the upper hole 7; the transfer shell 1 is also provided with a right hole 14, the hole core line of the right hole 14 is coaxial with the hole core line of the left hole 13, or the right hole 14 and the left hole 13 are parallel to each other with a second interval, and the cavity is positioned between the left hole 13 and the right hole 14 and is respectively communicated with the left hole 13 and the right hole 14; the cable also comprises a cable 8, one end of the cable 8 is provided with a metal wire core, and the outer surface of the cable 8 is provided with a metal layer 9; one end of the cable 8 with the metal wire core passes through the left hole 13, and the metal wire core is positioned in the cavity 2; the cable 8 is sleeved with the bushing 10 which extends into the cavity 2 from the right hole 14; the bushing 10 comprises a fixing tube 11 and a crimping tube 12, the crimping tube 12 is crimped and fixed with the metal layer 9, the fixing tube 11 is sleeved on the outer surface of the cable 8, a gap exists between the fixing tube 11 and the outer surface of the cable 8, and the fixing tube 11 is welded and fixed with the adapter housing 1.

The shape of the left and right holes 13 and 14 is not limited herein, and is preferably a circular hole; the size of the second space may be configured according to specific situations, which will not be described herein.

The metal wire core is used for being welded with the corresponding polarity of the coupling wire, and the metal wire core is peeled off from one end of the cable 8 and leaks out from one end of the cable 8; which is prior art and will not be described in detail herein.

The outer surface of the cable 8 is provided with a metal layer 9, and in this embodiment, the metal layer 9 comprises the following structure; the metal layer 9 comprises a metal braid which is reversely wrapped on the outer surface of the cable 8 and is leaked out by the stripping of the cable 8, and metal wires which are wound outside the metal braid.

As shown in fig. 2 to 3, the bushing 10 includes a fixing tube 11 and a crimp tube 12, wherein the fixing tube 11 and the crimp tube 12 are made of metal materials, and the fixing tube 11 and the crimp tube 12 may be made of materials consistent or inconsistent, and the crimp tube 12 is made of materials that are easy to deform and crimp, such as aluminum materials, without limitation.

In the embodiment, the bushing 10 is arranged between the cable 8 and the adapter housing 1, the pressure connection pipe 12 of the bushing 10 is fixed with the metal layer 9, and the fixed pipe 11 of the bushing 10 is welded and fixed with the adapter housing 1, so that the cable 8 and the adapter housing 1 are fixedly connected through the bushing 10; therefore, the embodiment solves the technical problem of how to fix the electrode lead and the outer shell in the prior art.

In this embodiment, after the cable 8 extends into the cavity from the left hole 13, the cable 8 is positioned at one end in the cavity and pulled out of the cavity from the right hole, then the crimp tube 12 is sleeved outside the metal layer 9, the crimp tube 12 and the metal layer 9 are crimped and fixed by using the crimp pliers, and finally the crimp tube 12 and the metal layer 9 which are crimped extend into the cavity from the right hole 14 to the left hole 13.

Preferably, the fixing tube 11 and the adapter housing 1 are fixed by means of laser welding.

Furthermore, before the crimping process, a polytetrafluoroethylene tube may be sleeved at one end of the stripped end of the cable 8 for reinforcement, which is not shown in the drawing in this embodiment.

Further, in order to facilitate the positioning of the fixing tube 11 in the cavity after extending into the cavity from the right hole 14 to the left hole 13, the present embodiment further includes the following technical scheme.

The fixed pipe 11 is provided with a first positioning surface 15, the inner wall of the cavity 2 is provided with a second positioning surface 16, the first positioning surface 15 and the second positioning surface 16 are arranged at an acute angle, a right angle or an obtuse angle with the extending direction of the cable, and the first positioning surface 15 and the second positioning surface 16 are in contact with each other. In this embodiment, the fixing tube 11 is positioned in the cavity after extending into the cavity from the right hole 14 to the left hole 13 through the first positioning surface 15 and the second positioning surface 16.

Further, the embodiment further includes the following technical solutions: the cable further comprises a plurality of first reinforcement pipes 17, wherein any one first reinforcement pipe 17 wraps one metal wire core of the cable 8; the thermocouple assembly further comprises a plurality of second reinforcement pipes 18, wherein any second reinforcement pipe 18 wraps one coupling wire of the armored thermocouple 4; the metal wire core and the even wire are mutually corresponding in polarity and fixedly connected in the cavity 2 through welding. Preferably, the first reinforcement pipe 17 and the second reinforcement pipe 18 are respectively polytetrafluoroethylene pipes.

In this embodiment, the first reinforcing pipe 17 is sleeved at one end of the stripping end of the cable 8, and the second reinforcing pipe 18 is sleeved on the coupling wire, so that the problem of insulation resistance reduction caused by the contact of the metal wire core or the coupling wire with the wall body of the switching housing 1 is prevented.

Further, referring to fig. 1 and 4, the present embodiment further includes a technical solution that a gap between an inner wall of the fixing tube 11 and an outer surface of the cable 8 is filled with silicone rubber 19; the device also comprises a right cover 22, wherein the right cover 22 seals the right hole 14 and is welded and fixed with the right hole 14; the direction pointing to the right hole 14 from the position of the filled silicone rubber 19, and the epoxy glue 20 is filled in the residual space between the silicone rubber 19 and the right hole 14 and in the cavity 2; and the upper cover 21 is also included, and the upper cover 21 seals the upper hole 7 and is welded and fixed with the upper hole 7.

In this embodiment, in order to fix the metal wire core and the coupling wire in the cavity relative to the adapting shell and fix the welding points of the metal wire core and the coupling wire relative to the adapting shell, the epoxy glue 20 is filled in the remaining space in the cavity, so as to ensure that each part in the cavity is kept relatively static relative to the adapting shell 1, and the epoxy glue 20 has higher insulating property, so that the insulating property among each part in the cavity is ensured; through practical tests, the armoured thermocouple switching structure of the embodiment has the internal insulation resistance at normal temperature reaching more than 500MΩ and higher insulation performance.

Furthermore, because the part of the armored thermocouple and the cable in the cavity are fixed by the colloid in the embodiment, the two switching points are also fixed, the vibration resistance is obviously improved, the sealing performance and the insulating performance are also greatly improved, and the device is suitable for more severe use conditions of future new-generation aeroengines.

Further, since the epoxy glue 20 has strong fluidity and overflow property, in order to avoid overflow of the epoxy glue 20 from the gap between the inner wall of the fixing tube 11 and the outer surface of the cable 8 during filling of the epoxy glue 20, in the embodiment, before the epoxy glue is filled, the silicone rubber 19 is filled in the gap between the inner wall of the fixing tube 11 and the outer surface of the cable 8; then the right hole 14 is plugged by the right cover 22 and welded and fixed with the right hole 14, so that the cavity is communicated with the atmosphere only through the upper hole, epoxy glue is injected into the cavity through the upper hole, and finally the upper hole 7 is plugged by the upper cover 21 and welded and fixed with the upper hole 7.

All assembly processes of the armored thermocouple switching structure of the embodiment are as follows: the method comprises the steps of stripping one end of a cable 8, reinforcing the stripping end by using a polytetrafluoroethylene heat-shrinkable sleeve, reversely wrapping a metal braiding layer outside the cable 8 to the outer surface of the cable, winding the metal braiding layer by using metal wires to avoid scattering of the metal braiding layer, and forming a metal layer 9; the fixing tube 11 is sleeved on the outer surface of the cable 8, the crimping tube 12 is crimped on the metal layer 9 of the cable 8 by using crimping pliers or other automatic crimping equipment, the whole assembly of the bushing 10 and the cable 8 is put into a cavity, the bushing 10 is pushed until the first positioning surface 15 and the second positioning surface 16 are contacted with each other, and the fixing tube 11 is welded with the adapter housing 1 by using laser welding; arranging even wires of the grouped armoured thermocouples and metal wire cores of the cables in the cavity, sleeving polytetrafluoroethylene tubes on the outer sides of the even wires, welding the metal wire cores and the even wires with corresponding polarities through argon arc welding stack welding, and arranging welding spots to proper positions in the cavity after welding; extending into the filling and sealing gun from the right hole, filling silicone rubber paste into a gap between the inner wall of the fixed pipe 11 and the outer surface of the cable 8, and solidifying; sealing the right cap 22 to close the right hole 14 using welding; extending into a filling and sealing gun from an upper hole position, filling and sealing epoxy adhesive into the residual space in the cavity, fully standing, curing, checking the cured surface of the epoxy adhesive after full curing, and filling again as required; finally, the upper cover 21 and the upper hole 7 are sealed by welding; finally, carrying out sand blasting treatment on the metal surface of the armored thermocouple switching structure, and measuring the precision, the resistance, the insulation resistance and the output consistency of the metal surface; the part of compensation cable outside the armored thermocouple switching structure can be connected with the controller after being bent and formed according to the pipeline layout of the aeroengine; the armored thermocouple switching structure is connected with the engine casing through threads on the switching shell 1 and is locked with the casing through a fuse hole on the switching shell, the threads and the fuse hole are arranged on the switching shell 1 in the prior art, and the threads and the fuse hole are not shown in the figure.

Furthermore, in the embodiment, the metal wire cores and the even wires with corresponding polarities are welded by adopting a welding mode of argon arc welding stack welding, and the welding mode of the argon arc welding stack welding has the characteristics of high strength, stable structure and strong sealing capability, and is suitable for the oil-rich environment of the temperature measuring position of the engine.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (9)

1. The armored thermocouple switching structure is characterized by comprising a switching shell (1), wherein a cavity (2) is arranged in the switching shell (1); a metal tube (3) is arranged on one side of the switching shell (1), and a tube cavity of the metal tube (3) is communicated with the cavity (2);

The device also comprises an armored thermocouple (4) and a sleeve (5), wherein the armored thermocouple (4) at least comprises a first section and a second section, and the first section is provided with a coupling wire; the first section is penetrated through the sleeve (5), the coupling wires extend into the cavity (2), and at least part of the second section is contacted with the inner wall of the pipe cavity of the metal pipe (3);

And the outer wall of the sleeve (5) is welded and connected with the inner wall of the metal tube (3), and the inner wall of the sleeve (5) is welded and connected with the outer surface of the armor material of the armored thermocouple (4).

2. The armored thermocouple switching structure according to claim 1, wherein a widening channel (6) is formed in the metal tube (3), the widening channel (6) is located at one end of the metal tube (3) facing the cavity (2), and the sleeve (5) is arranged in the widening channel (6).

3. The armored thermocouple switching structure according to claim 2, wherein the switching housing (1) is provided with an upper hole (7), the cavity (2) is located between the upper hole (7) and the metal tube (3), and the hole axis of the upper hole (7) coincides with the central axis of the metal tube (3) or has a first interval.

4. The armored thermocouple switching structure according to claim 3, wherein the switching housing (1) is provided with a left hole (13), and the hole center line of the left hole (13) is perpendicular to the hole center line of the upper hole (7); the switching shell (1) is also provided with a right hole (14), the hole core line of the right hole (14) is coaxial with the hole core line of the left hole (13), or the right hole and the left hole (13) are parallel to each other and have a second interval, and the cavity is positioned between the left hole (13) and the right hole (14) and is respectively communicated with the left hole (13) and the right hole (14);

the cable also comprises a cable (8), one end of the cable (8) is provided with a metal wire core, and the outer surface of the cable (8) is provided with a metal layer (9); one end of a cable (8) with a metal wire core passes through the left hole (13), and the metal wire core is positioned in the cavity (2);

The cable also comprises a bushing (10) which extends into the cavity (2) from the right hole (14) and is sleeved outside the cable (8); the bushing (10) comprises a fixed pipe (11) and a crimping pipe (12), the crimping pipe (12) is fixedly crimped with the metal layer (9), the fixed pipe (11) is sleeved on the outer surface of the cable (8) and is in clearance with the outer surface of the cable (8), and the fixed pipe (11) is fixedly welded with the switching shell (1).

5. The armored thermocouple switching structure according to claim 4, wherein a first positioning surface (15) is arranged on the fixed pipe (11), a second positioning surface (16) is arranged on the inner wall of the cavity (2), the first positioning surface (15) and the second positioning surface (16) are arranged at an acute angle, a right angle or an obtuse angle with the extending direction of the cable, and the first positioning surface (15) and the second positioning surface (16) are in contact with each other.

6. The armored thermocouple junction according to claim 5, wherein the metal core is stripped from one end of the cable (8) and leaks out of one end of the cable (8);

the metal layer (9) comprises: the cable comprises a metal braiding layer reversely wrapped on the outer surface of the cable (8) and leaked from the stripping head of the cable (8), and a metal wire wound outside the metal braiding layer.

7. The armored thermocouple junction according to claim 6, further comprising a plurality of first stiffening tubes (17), any one of the first stiffening tubes (17) wrapping one of the metal cores of the cable (8);

The thermocouple also comprises a plurality of second reinforcement pipes (18), wherein any second reinforcement pipe (18) wraps one coupling wire of the armored thermocouple (4);

the metal wire core and the even wire are mutually corresponding in polarity and fixedly connected in the cavity (2) through welding.

8. The armored thermocouple switching structure according to claim 7, wherein the gap between the inner wall of the fixed tube (11) and the outer surface of the cable (8) is filled with silicone rubber (19);

The device also comprises a right cover (22), wherein the right cover (22) seals the right hole (14) and is welded and fixed with the right hole (14);

The direction of the right hole (14) is pointed at by the position of the filling silicon rubber (19), and epoxy glue (20) is filled in the remained space of the cavity (2) between the silicon rubber (19) and the right hole (14);

The device also comprises an upper cover (21), wherein the upper cover (21) seals the upper hole (7) and is welded and fixed with the upper hole (7).

9. The armored thermocouple junction according to claim 7, wherein the first stiffening tube (17) and the second stiffening tube (18) are respectively polytetrafluoroethylene tubes.