A pipe connection fitting and a pipe

Abstract

The present application relates to a kind of pipeline connecting joint and pipeline, belong to composite precision forming technical field, solve the problem that existing connecting joint cannot meet the use demand of pipeline with the dual function of ventilation and power supply.The pipeline connecting joint includes connecting body;The connecting body is provided with axial through-hole, and the through-hole is used to pass through gas;The end surface of the connecting body is provided with first recess, and the first recess is used to place thermocouple, to realize power signal;The first recess is communicated with the through-hole.The present application realizes the diversification of pipeline function, and a pipeline has both ventilation function and power supply function.

Description

Technical Field

[0001] The present invention relates to the field of precision forming technology, and particularly to a pipeline connection joint and a pipeline. Background Art

[0002] With the development of aerospace technology, miniaturization and structural weight reduction have become increasingly important. Correspondingly, the cabin space has become increasingly narrow. Therefore, there is a need to prepare a pipeline that can output electrical signals and have ventilation capabilities in a narrow space.

[0003] Existing pipelines have single functions, with the ventilation pipeline and the pipeline for transmitting electrical signals being set separately, which cannot meet the usage requirements in a narrow cabin. Moreover, the existing connection joints cannot meet the usage requirements of pipelines with dual functions of ventilation and power transmission. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide a pipeline connection joint and a pipeline to solve the problem that the existing connection joints cannot meet the usage requirements of pipelines with dual functions of ventilation and power transmission.

[0005] The object of the present invention is mainly achieved through the following technical solutions:

[0006] On the one hand, the present invention provides a pipeline connection joint, including a connection body; an axial through-hole is provided on the connection body, and the through-hole is used for gas passage; a first groove is provided on the end face of the connection body, and the first groove is used for placing a thermocouple to achieve power transmission signals; the first groove is communicated with the through-hole.

[0007] Optionally, a second groove for placing a thermocouple is provided on the side surface of the connection body, the second groove is parallel to the axis of the connection body, and extends from one end of the connection body to the other end.

[0008] Optionally, the second groove is communicated with the first groove.

[0009] Optionally, the number of the second grooves is two, and the two second grooves are axially symmetrically arranged with respect to the through-hole.

[0010] Optionally, the length of the first groove is equal to the outer diameter of the connection body.

[0011] Optionally, the first groove is in a "one" shape.

[0012] Optionally, an insulating coating is provided on the end face of the connection body where the first groove is provided to prevent the connection body from conducting with the thermocouple.

[0013] Optionally, the material of the connection body is a high-temperature resistant alloy material.

[0014] Optionally, the connecting body is externally threaded to connect with other components.

[0015] In another aspect, the application also provides a pipeline, comprising a gas path assembly, a thermocouple, a connecting nozzle and an electrical connector; the gas path assembly is connected with the connecting nozzle to realize the ventilation of the pipeline; the thermocouple is fixed in a first recess of the gas path assembly, and the free end thereof is connected with the electrical connector to realize the electrical signal of the pipeline; the gas path assembly comprises the connecting joint and a gas path body, and the gas path body is connected with the connecting joint.

[0016] Compared with the prior art, the application can achieve at least one of the following beneficial effects:

[0017] (1) The pipeline connecting joint provided by the application comprises a connecting body, a first recess for placing a thermocouple is formed in the connecting body, thus, the axial through hole provided on the connecting body can provide a gas passage, and the connecting end for providing an electrical signal can be provided at the same time, so that the pipeline connecting joint of the application has gas and electrical dual functions.

[0018] (2) The application provides a first recess on the end face of the connecting body, an axial through hole is provided, the node of the thermocouple is suspended at the communication between the first recess and the through hole, so that the gas can enter the through hole and the gas path body through the gap between the node and the connecting body, and the ventilation function of the pipeline is realized. The thermocouple is provided to realize the electrical function of the pipeline, and thus the dual functions of ventilation and electricity are realized.

[0019] (3) The application provides a first recess on the end face of the connecting body, a second recess is provided on the outer surface of the connecting body, and the first recess and the second recess are communicated, so that the thermocouple can be placed in the first recess and the second recess in order. On the one hand, the risk of short circuit caused by the contact between the thermocouple and other metals is reduced, and on the other hand, the volume of the whole pipeline is reduced.

[0020] (4) The application sprays an insulating coating on the end face of the first recess, which can prevent the connecting body from being in conduction with the thermocouple.

[0021] (5) The application provides a slot at the connection between the connecting body and the gas path body, which can make the connection between the connecting body and the gas path body more firm.

[0022] (6) The application provides an insulating part outside the thermocouple, which can insulate the thermocouple from other metals of the pipeline, so as to realize the function of the thermocouple transmitting electrical signals, and make the transmitted electrical signals clear and stable.

[0023] (7) The present application can position and limit the sleeve body on the cabin body by setting the limiting sleeve outside the sleeve body, thereby saving the internal space of the cabin body. By reasonably setting the spacing between the multiple limiting sleeves, other lines or components can pass through the gap between adjacent limiting sleeves, further saving the internal space of the cabin body.

[0024] (8) In the forming method of the pipeline with dual functions of air passage and power supply, the first sleeve assembly and the second sleeve assembly are not bent and formed before being sleeved into the air passage body, but are bent and formed after being sleeved into the air passage body, thereby reducing damage to the insulating part outside the thermocouple in the process of sleeving the first sleeve assembly and the second sleeve assembly, effectively ensuring insulation of the thermocouple and the remaining metal part of the pipeline, and improving the qualification rate of the pipeline with dual functions of air passage and power supply.

[0025] (9) In the forming method of the pipeline with dual functions of air passage and power supply, the air tightness and / or insulation test is performed after each operation, so that problems can be found in time and handled in time, thereby improving the forming efficiency and the forming qualification rate.

[0026] (10) The present application is aimed at the problem that it is difficult to perform the positive pressure air tightness test when the thermocouple is bonded in the second groove. The vacuum bag is used to perform the negative pressure test, which can ensure the completion of the air tightness test and protect the thermocouple from being damaged.

[0027] (11) The present application sets the flow guide, which can limit the airflow from the through hole on the connecting body 1-1 to improve the air passage effect, and protect the front-end thermocouple.

[0028] (12) The present application sets the weak part, which facilitates the breaking and falling of the pipeline after completing the corresponding function.

[0029] (13) The present application sets the protection tool, which can effectively prevent the weak part from being broken in the subsequent turnover and processing.

[0030] In the present application, the above-mentioned technical solutions can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification or by implementing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings are included to provide a further understanding of the application and are incorporated herein and constitute a part of the application. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0032] Figure 1Structure diagram of the pipeline with ventilation and electricity transmission functions of the application;

[0033] Figure 2 Structure diagram of the gas path assembly;

[0034] Figure 3 Structure diagram of the first sleeve assembly;

[0035] Figure 4 Structure diagram of the second sleeve assembly;

[0036] Figure 5 Structure diagram of the gas path main body with a weak part (annular groove);

[0037] Figure 6 Structure diagram of the protection tool;

[0038] Figure 7 Structure diagram of the flow guide;

[0039] Figure 8 Structure diagram of the tool electrode of the application;

[0040] Figure 9 Structure diagram of the tool electrode of the application; Figure 8 Structure diagram of the cross section at A-A;

[0041] Figure 10 Structure diagram of the tool electrode of the application; Figure 8 Structure diagram of the cross section at B-B;

[0042] Figure 11 Structure diagram of the tool electrode of the application when the center line of the discharge end coincides with the central axis of the inner cavity of the stainless steel pipe;

[0043] Figure 12 Structure diagram of the tool electrode of the application when the center line deviates from the central axis of the inner cavity of the stainless steel pipe;

[0044] Figure 13 Structure diagram of the tool electrode of the application when the discharge end sleeve is on the stainless steel pipe;

[0045] Figure 14 Structure diagram of the tool electrode of the application when the discharge end surrounds the central axis of the inner cavity of the stainless steel pipe and moves eccentrically, and the movement trajectory of the center point O2 of the discharge end is shown;

[0046] Figure 15 Structure diagram of the tool electrode of the application when the discharge end surrounds the central axis of the inner cavity of the stainless steel pipe and moves eccentrically, and the movement trajectory of any point O3 of the discharge end is shown;

[0047] Figure 16 Structure diagram of the bearing assembly of the application and the stainless steel pipe;

[0048] Figure 17 Structure diagram of annular groove of stainless steel pipe in the present application;

[0049] Figure 18 Structure diagram of cooperation of equal-height positioning block, clamping plate and stainless steel pipe in the present application;

[0050] Figure 19 Structure diagram of cooperation of auxiliary bearing block and stainless steel pipe in the present application.

[0051] Reference signs:

[0052] 1, gas path assembly; 1-1, connecting main body; 1-2, gas path main body; 1-3, through hole; 1-4, first groove; 1-5, second groove; 1-6, first open slot; 1-7, protrusion; 2, first sleeve assembly; 2-1, first sleeve main body; 2-2, first limiting sleeve; 2-3, connecting sleeve; 3, second sleeve assembly; 3-1, second sleeve main body 3-1; 3-2, second limiting sleeve; 4, thermocouple; 5, connecting nozzle; 6, electrical connector; 7, weak part; 8, protective tool; 8-1, protective main body; 8-2, pressing part; 8-3, anti-loosening part; 8-4, through slot; 9, flow guide part; 9-1, flow guide main body; 9-2, flow guide cap; 9-3, flow guide hole; 10, tool electrode; 11, workbench surface; 12, equal-height positioning block; 13, auxiliary bearing block; 14, clamping plate; 15, transmission rod; 101, discharge end; 102, working end; 103, non-working end; 104, conductive end; 16, machining direction; 17, eccentric movement direction;

[0053] H1, wall thickness of stainless steel pipe; H2, wall thickness of annular groove; α, oblique angle; S 11 , S 12 , S 13 , S 14 , actual excess gap value between four points selected on the circular working end of the tool electrode and the outer end surface of the stainless steel pipe; S2, machining gap; O1, center point of the discharge end; O2, center point of the inner cavity of the stainless steel pipe; O3, selected point on the discharge end. DETAILED DESCRIPTION

[0054] The preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings constitute a part of the present application and serve to explain the principles of the embodiments of the present application, but are not used to limit the scope of the present application.

[0055] Example One

[0056] One specific embodiment of the present application discloses a pipe connecting joint, such as Figure 2As shown, the connecting body 1-1 is provided with an axial through hole 1-3, and one end of the connecting body 1-1 is connected with the gas path body 1-2. An end face of the other end of the connecting body 1-1 is provided with a first groove 1-4 for placing the thermocouple 4. The first groove 1-4 is in the shape of a Chinese character "yi" and has a length equal to the outer diameter of the connecting body 1-1. The through hole 1-3 is in communication with the first groove 1-4.

[0057] In a preferred embodiment, the end face of the connecting body 1-1 provided with the first groove 1-4 is provided with an insulating coating, so as to prevent the connecting body 1-1 from being in conduction with the thermocouple 4.

[0058] In addition, the connecting body 1-1 is provided with external threads for connecting with other components (for example, a flow guide).

[0059] Further, the side face of the connecting body 1-1 is provided with a second groove 1-5 for placing the thermocouple 4. The second groove 1-5 is parallel to the axial direction of the connecting body 1-1 and extends from one end of the connecting body 1-1 to the other end. The second groove 1-5 has two numbers and is in communication with the first groove. The two second grooves are symmetrically arranged with respect to the through hole. The thermocouple 4 extends from the first groove 1-4 into the second groove 1-5, and then extends along the length direction of the gas path body 1-2 close to the gas path body 1-2 and on the outside of the gas path body 1-2.

[0060] Embodiment two

[0061] In one specific embodiment of the present application, a pipe connecting seat is disclosed. The pipe connecting seat comprises the connecting body 1-1 and the protrusion 1-7 of the embodiment one.

[0062] The protrusion 1-7 is arranged on one end of the connecting body 1-1 and circumferentially along the outer surface of the connecting body 1-1. The protrusion functions as a limiting part to prevent over-tightening. The end of the connecting body 1-1 provided with the protrusion 1-7 is connected with the gas path body 1-2.

[0063] In a possible embodiment, the protrusion 1-7 is provided with radial open grooves. The open grooves are used for the thermocouple to pass through and for the installation of the pipe. Specifically, the open grooves comprise first open grooves 1-6 and second open grooves. The first open grooves 1-6 and the second open grooves each have two numbers. The two first open grooves 1-6 and the two second open grooves are alternately and uniformly distributed in the circumferential direction. The two first open grooves 1-6 are respectively in communication with the two second grooves, so as to facilitate the thermocouple 4 to pass through. The two second open grooves are used for the overall installation of the pipe. Exemplarily, the protrusion 1-7 is in the structure of a flange plate.

[0064] Embodiment three

[0065] One specific embodiment of the present application discloses a pipeline with dual functions of ventilation and power supply, which comprises a gas path assembly 1, a first sleeve assembly 2, a second sleeve assembly 3, a thermocouple 4, a connecting nozzle 5 and an electric connector 6. Figure 1 As shown in the figure, the gas path assembly 1 is connected with the connecting nozzle 5, which is used to realize the ventilation of the pipeline. The thermocouple 4 is fixed on the gas path assembly 1, and its free end is connected with the electric connector 6, which is used to realize the power supply signal of the pipeline. The first sleeve assembly 2 and the second sleeve assembly 3 are sleeved outside the gas path assembly 1 and the thermocouple 4, which are used to protect the gas path assembly 1 and the thermocouple 4.

[0066] As shown in the figure, Figure 2 The connecting seat of the embodiment two and the gas path main body 1-2 are included in the gas path assembly 1. The connecting seat includes a connecting main body 1-1, which is provided with an axial through hole 1-3. One end of the connecting main body 1-1 is connected with the gas path main body 1-2, and the end face of the other end is provided with a first groove 1-4 for placing the thermocouple 4. The first groove 1-4 is in the shape of "one", and its length is equal to the outer diameter of the connecting main body 1-1. The through hole 1-3 is in communication with the first groove 1-4.

[0067] The first sleeve assembly 2 and the second sleeve assembly 3 are both sleeved outside the gas path main body 1-2 and the thermocouple 4, which are used to protect the gas path main body 1-2 and the thermocouple 4, and the second sleeve assembly 3 is located downstream of the first sleeve assembly 2.

[0068] In a preferred embodiment, the end face of the connecting main body 1-1 provided with the first groove 1-4 is provided with an insulating coating, so as to prevent the connecting main body 1-1 from being in conduction with the thermocouple 4.

[0069] The side face of the connecting main body 1-1 is provided with a second groove 1-5, which is parallel to the axial direction of the connecting main body 1-1 and extends from one end to the other end of the connecting main body 1-1. The number of the second grooves 1-5 is two, and they are both in communication with the first groove. The two second grooves are symmetrically arranged relative to the through hole.

[0070] In a possible embodiment, the connecting seat further includes a protrusion 1-7, which is arranged at one end of the connecting main body 1-1 connected with the gas path main body 1-2. The protrusion 1-7 is circumferentially arranged along the outer surface of the connecting main body 1-1. The connecting main body 1-1 is provided with external threads to be connected with other components (such as flow guide). The protrusion plays a limiting role to prevent over-tightening. The protrusion 1-7 is provided with a radial opening slot.

[0071] Specifically, the opening slots include first opening slots 1-6 and second opening slots. The number of the first opening slots 1-6 and the second opening slots is both two. The two first opening slots 1-6 and the two second opening slots are alternately and evenly distributed in the circumferential direction. The two first opening slots 1-6 are respectively communicated with the two second grooves, so as to facilitate the passage of the thermocouple 4. The two second opening slots are used for the overall installation of the pipeline. Exemplarily, the protrusions 1-7 are flange plate structures.

[0072] Further, a welding slot (not shown in the figure) is arranged at the connection between the connecting body 1-1 and the gas path body 1-2. Through the above arrangement, the welding of the connecting body 1-1 and the gas path body 1-2 can be more reliable.

[0073] The other end of the gas path body 1-2 is connected with the connecting pipe nozzle 5. Specifically, the gas path body 1-2 is a stainless steel pipe with a diameter of 2 mm and a wall thickness of 0.5 mm.

[0074] As shown in Figure 3 The first sleeve assembly 2 includes a first sleeve body 2-1, a first limiting sleeve 2-2, and a connecting sleeve 2-3. The first sleeve body 2-1 is a hollow tube, which is sleeved outside the gas path body 1-2 and used for protecting the gas path body 1-2 and the thermocouple 4. The first limiting sleeve 2-2 is a hollow tube, which is sleeved outside the first sleeve body 2-1 and used for positioning and limiting the first sleeve body 2-1 on the cabin body, so as to position and limit the gas-electric dual-function pipeline on the cabin body. Specifically, the bottom of the limiting part of the first limiting sleeve 2-2 is adhered to the cabin body wall. The connecting sleeve 2-3 is sleeved outside the first sleeve body 2-1 at one end of the first sleeve body 2-1 and connected with the connecting body 1-1.

[0075] In a preferred embodiment, the number of the first limiting sleeve 2-2 is multiple, and the multiple first limiting sleeves are sequentially arranged along the length direction of the first sleeve body 2-1, and gaps are arranged between adjacent first limiting sleeves for installing and limiting other components, so as to achieve the purpose of reasonable use of space and orderly arrangement of components. The size of the gap can be determined according to the components to be installed and limited.

[0076] In a possible embodiment, the first limiting sleeve 2-2 and the connecting sleeve 2-3 are fixedly connected with the first sleeve body 2-1, for example, by welding.

[0077] In addition, the connecting sleeve 2-3 is fixedly connected with the connecting body 1-1, so as to realize the connection of the first sleeve assembly 2 and the gas path assembly 1.

[0078] In a specific embodiment, the first sleeve body 2-1 is a stainless steel pipe with a diameter of 5 mm and a wall thickness of 0.8 mm.

[0079] The second sleeve assembly 3 is arranged downstream of the first sleeve assembly 2 to realize segmented protection. As shown in Figure 4 The second sleeve assembly 3 is arranged downstream of the first sleeve assembly 2 to realize segmented protection. As shown in

[0080] Specifically, the second sleeve body 3-1 is a stainless steel pipe with a diameter of 4 mm and a wall thickness of 0.3 mm.

[0081] The second limiting sleeve 3-2 is a stainless steel pipe with a diameter of 5 mm and a wall thickness of 0.5 mm.

[0082] In a preferred embodiment, as shown in Figure 5 Specifically, the weak part 7 is an annular groove arranged circumferentially along the outer surface of the gas path body 1-2, that is, the wall thickness of the gas path body 1-2 at the position where the weak part 7 is arranged is smaller than the wall thickness of the gas path body 1-2 at the position where the weak part 7 is not arranged. For example, the wall thickness of the gas path body 1-2 at the position where the weak part 7 is not arranged is 0.5 mm, and the wall thickness of the gas path body 1-2 at the position where the weak part 7 is arranged is 0.2 mm, and the depth of the annular groove is 0.3 mm.

[0083] The thermocouple 4 is used for transmitting an electric signal, and a node is arranged on the thermocouple 4 for generating and transmitting the electric signal, and an insulating part is arranged outside the thermocouple 4. The thermocouple 4 is in a wire shape, and is preferably a platinum-rhodium wire. The node is arranged at the position where the first groove and the through hole are communicated, and is arranged in a suspended manner. The above arrangement has the advantage that the gas can enter the through hole and the gas path body through the gap between the node and the connecting seat, thereby realizing the air passage function.

[0084] In a possible manner, the thermocouple 4 located on both sides of the node is fixed in the two second grooves respectively, and the free end of the thermocouple 4 is connected with the electric connector 6. Exemplarily, the thermocouple 4 is fixed in the second groove by means of adhesion. The adhesive used can be J303 glue.

[0085] Specifically, the material of the insulating part is alumina ceramic. The advantage of using alumina ceramic is that the application environment of the pipeline of the present application is a high-temperature environment, and alumina has good high-temperature resistance and will not be aged due to high temperature, thereby achieving good insulation effect.

[0086] In a preferred mode, the insulation part comprises a plurality of insulation units arranged in sequence along the length direction of the thermocouple 4. The insulation part is arranged in sections. The present embodiment realizes the arrangement of the insulation part in sections by arranging the insulation part to comprise a plurality of insulation units, facilitating the subsequent bending of the pipeline into a shape and preventing the insulation part from being damaged during the bending process. Exemplarily, the insulation unit is a hollow cylinder with a length of 5 mm, an inner diameter of 0.5 mm, and an outer diameter of 1 mm. The material of the insulation unit is alumina ceramic.

[0087] Since the front end of the gas circuit assembly is in a high-temperature environment, the connecting seat at the front end of the gas circuit assembly is made of a high-temperature-resistant alloy material, the gas circuit body is made of stainless steel, the circuit part uses a thermocouple (platinum rhodium wire) to transmit an electrical signal, and an electrical connector is used at the end to transmit the electrical signal. Therefore, during the design and manufacturing of the pipeline, the circuit part and the gas circuit part need to be insulated, and the components of the pipeline need to have a limiting and positioning auxiliary function in a narrow cabin to meet the final use requirements.

[0088] In addition, the pipeline with the functions of air passage and electricity passage in the present embodiment further comprises a flow guide 9. The flow guide 9 is arranged at the end of the connecting body 1-1 provided with the first groove 1-4, and is used to guide the airflow into the through hole of the connecting body 1-1. Figure 7 As shown in FIG. 1, the flow guide 9 comprises a flow guide body 9-1 and a flow guide cap 9-2 arranged at one end of the flow guide body 9-1.

[0089] The flow guide body 9-1 is in a cylindrical shape, and a flow guide hole 9-3 penetrating through the flow guide body 9-1 and the flow guide cap 9-2 is arranged on the flow guide body 9-1. The flow guide hole is arranged in an axial direction and is a through hole. The flow guide hole 9-3 is internally threaded to realize threaded connection with the connecting body 1-1. After the flow guide is installed on the connecting body 1-1, the end surface of the flow guide cap 9-2 is higher than the end surface of the connecting body 1-1 provided with the first groove, thereby forming a flow guide channel. The gas first enters the flow guide channel and is then guided into the through hole of the connecting body 1-1.

[0090] Embodiment Four

[0091] In another specific embodiment of the present application, a processing method for a connecting seat of a gas-electric dual-function pipeline is disclosed, which is used for processing the connecting seat of embodiment two and comprises the following steps:

[0092] Step 1: turning the outer shape of the connecting seat on a lathe, i.e. the connecting body and the protrusion at one end of the connecting body, and the external threads on the connecting body.

[0093] Step 2: processing the through hole on the connecting body.

[0094] The through hole on the connecting body is processed by electric spark machining with the other end of the connecting body (i.e. the end surface of the end not including the protrusion) as a reference.

[0095] Step 3: machining the second groove on both sides of the connecting body, the opening groove on the protrusion, and the first groove on the connecting body, specifically including the following steps:

[0096] The same reference is adopted as in step 2, that is, the end face of the other end of the connecting body (i.e., the end not including the protrusion) is still used as the reference. First, two first opening grooves on the protrusion and the second grooves on both sides of the connecting body are simultaneously machined by electric spark machining; second, two second opening grooves on the protrusion are machined by electric spark machining; and finally, the first groove on the connecting body is machined by electric spark machining.

[0097] When machining, the size tolerance of the first groove and the second groove needs to be strictly controlled so that the thermocouple with the set insulation part (alumina ceramic) does not protrude from the groove after being placed in the groove.

[0098] Example Five

[0099] Another specific embodiment of the present application discloses a forming method of a gas-electric dual-function pipeline for forming the pipeline with dual functions of gas passage and electricity passage according to example three.

[0100] Before forming the gas-electric dual-function pipeline, each component, such as the connecting seat, the first sleeve assembly, the second sleeve assembly, etc., is first machined and formed. After each component is machined and formed, the entire gas-electric dual-function pipeline is not formed as a whole, but each component is assembled first to ensure that each component can be smoothly assembled, and then the entire gas-electric dual-function pipeline is formed as a whole.

[0101] The machining of the connecting seat is described in example four, and the forming of the first sleeve assembly 2 and the second sleeve assembly 3 is described below.

[0102] The first sleeve assembly 2 is formed by the following method:

[0103] Step 1: calculate the length of the first sleeve body 2-1, saw cut the blank, and remove burrs on the flat end;

[0104] Step 2: cut a plurality of first limiting sleeves 2-2, saw cut the blank, and remove burrs on the flat end;

[0105] Step 3: machine and form the connecting sleeve 2-3;

[0106] Step 4: mark lines on the first sleeve body, and weld the plurality of first limiting sleeves 2-2 and the first sleeve body 2-1 as a whole by cold welding. When welding each first limiting sleeve, only four points are welded from front to back and from top to bottom, and the welding is firm. The welding current is controlled to avoid the occurrence of welding bumps inside the first sleeve body 2-1 during welding;

[0107] Step 5: The connecting sleeve is sleeved on one end of the first sleeve body and welded; the welding method is the same as step 4.

[0108] The second sleeve assembly 3 is formed by the following method:

[0109] Step 1: Calculate the length of the second sleeve body 3-1, saw cut the blank, and remove burrs from the flat end.

[0110] Step 2: Blank the second limiting sleeve 3-2, and remove burrs from the flat end.

[0111] Step 3: The second limiting sleeve 3-2 is sleeved on the second sleeve body 3-1 and welded; attention should be paid to the fact that the tube wall is too thin and is easy to be welded through, so a copper rod is needed inside.

[0112] The assembly method of the gas-electric dual-function pipeline includes the following steps:

[0113] Step 1: Connect the gas path body with the connecting seat to obtain a gas path assembly.

[0114] Step 2: The insulating part is sleeved on the outside of the thermocouple, and the thermocouple is fixed on the connecting seat. Specifically as follows:

[0115] Step 21: The node of the thermocouple is placed at the communication between the first groove and the through hole on the connecting body of the connecting seat, and is suspended;

[0116] Step 22: A plurality of insulating units are sequentially sleeved on the thermocouple, so as to realize sleeving the insulating part on the thermocouple;

[0117] Step 23: The thermocouple is fixed in the second groove on the connecting body.

[0118] Step 3: The sleeve assembly is sleeved on the outside of the gas path body and the thermocouple, specifically as follows:

[0119] Step 31: The first sleeve assembly is sleeved on the outside of the gas path body and the thermocouple;

[0120] Step 32: The second sleeve assembly is sleeved on the outside of the gas path body and the thermocouple, downstream of the first sleeve assembly.

[0121] Further, step 31 further includes: if there is a damaged insulating unit during sleeving the first sleeve assembly, the damaged insulating unit is removed, and the subsequent insulating units are arranged smoothly and then sleeved again.

[0122] Step 4: The gas path body is connected with the pipe mouth.

[0123] Step 5: The free end of the thermocouple is connected with the electric connector to obtain a gas-electric dual-function pipeline.

[0124] The forming method of the gas-electric dual-function pipeline of the embodiment comprises the following steps:

[0125] Step 1: insert one end of the gas path main body 1-2 into the welding slot of the connecting main body 1-1, and weld them together by argon arc welding to make them into one, and obtain the gas path assembly 1. When welding, there is a 10mm allowance between the gas path main body 1-2 and the connecting main body 1-1, which aims to meet the minimum pipeline size of the air passage and forming function.

[0126] Step 2: weld the other end of the gas path main body 1-2 with the connecting nozzle 5, and conduct a positive pressure air tightness test on the gas path assembly 1 to check the air tightness of the weld between the connecting main body 1-1 and the gas path main body 1-2. After the air tightness is qualified, pass the weld with 0.5mm iron wire to ensure that the through hole on the connecting main body after welding can pass air. Ensure that the through hole on the connecting main body after welding can pass air, remove the connecting nozzle 5 and the reserved allowance to ensure that the subsequent sleeve can be smoothly sleeved. If the air tightness is unqualified, find out the reason until the air tightness is qualified.

[0127] Step 3: fix the thermocouple.

[0128] Spray an insulating coating on the end face of the connecting main body 1-1 provided with the first groove 1-4, place the node of the thermocouple 4 at the communication between the first groove 1-4 and the through hole 1-3 on the connecting main body 1-1, and suspend the thermocouple 4, and then sleeve the insulating part on the thermocouple 4. Then, the thermocouple 4 is fixed in the first groove 1-4 and the second groove 1-5 by J303 adhesive. After the bonding is completed, the insulation of the thermocouple 4 and other metal parts of the pipeline is measured.

[0129] Step 4: after confirming the insulation of the thermocouple 4 and other metals of the pipeline, sleeve the first sleeve assembly 2 into the outside of the gas path main body 1-2 and the thermocouple 4. Specifically as follows:

[0130] Two people operate to straighten the thermocouple 4, and slowly sleeve the first sleeve assembly 2. If it is found that some insulating units outside the thermocouple 4 are damaged during the sleeving process, the first sleeve assembly 2 can be slowly removed, the damaged insulating units can be removed, and then the subsequent insulating units can be re-sleeved after being arranged smoothly. During the entire sleeving process, the thermocouple 4 cannot be bent or damaged. After the sleeving is completed, the resistance is measured to ensure the insulation of the thermocouple 4 and other metal parts of the pipeline. If it is not insulated, the first sleeve assembly 2 is removed and re-sleeved. After confirming the insulation, the first sleeve assembly 2 and the connecting main body 1-1 are welded, and the resistance is measured again after the welding is completed to confirm whether it is insulated. If it is not insulated, find out the reason until it is insulated.

[0131] Step 5: sleeve the second sleeve assembly 3 into the outside of the gas path main body 1-2 and the thermocouple 4, the first sleeve assembly 2, and the connecting main body 1-1.

[0132] Downstream of the first sleeve assembly 2, the second sleeve assembly 2 is sleeved in. The matters needing attention during the sleeving are the same as those during the sleeving of the first sleeve assembly 2. After the sleeving is completed, the resistance is measured to ensure that the thermocouple 4 and the rest of the metal part of the pipeline are insulated. After the insulation is confirmed, the second sleeve assembly 3 and the connecting body 1-1 are welded, and after the welding is completed, the resistance is measured again to confirm whether the insulation is good. If the insulation is not good, the reason is found out until the insulation is good.

[0133] Step 6: According to the design requirements, the first sleeve assembly 2 and the second sleeve assembly 3 are bent and shaped. During the bending, it needs to be slow and careful. After the bending is completed, the resistance is measured to ensure that the thermocouple 4 and the rest of the metal part of the pipeline are insulated. The first sleeve assembly 2 and the second sleeve assembly 3 are bonded and fixed by using J303 glue to obtain a pipeline with gas and electric dual functions.

[0134] Step 7: The pipeline with gas and electric dual functions is subjected to airtightness test.

[0135] Since the second groove 1-5 of the connecting body 1-1 is bonded with the thermocouple 4 at this time, it is difficult to perform a positive pressure airtightness test. In a preferred embodiment, therefore, all parts in front of the weld at the pipe nozzle 5 can be loaded into an airtight test piece, and the mouth part is sealed by sealing cement, and the airtightness test is performed in a way of negative pressure extraction. Specifically, the airtight test piece can be a vacuum bag.

[0136] Step 8: The free end of the thermocouple 4 is connected with the electric connector 6, and the resistance is measured to ensure that the thermocouple 4 and the rest of the metal part of the pipeline are insulated.

[0137] Example Six

[0138] Another specific embodiment of the present application provides a processing method of an annular groove for processing a weak part of the gas and electric dual function pipeline of Example Three.

[0139] The present embodiment adopts an electric spark processing mode to solve the problem that it is difficult to process an annular groove on an ultra-fine long and thin-walled tubular part with high precision.

[0140] Specifically, the method comprises using a plurality of electric spark processing point positions of a tool electrode arranged circumferentially around the to-be-processed part in a working state to process the annular groove on the to-be-processed surface.

[0141] The same electric spark processing point position comprises a working state and a non-working state. When the distance between the electric spark processing point position and the to-be-processed surface is greater than a threshold value, the electric spark processing point position is in the non-working state.

[0142] When the distance between the electric spark processing point position and the to-be-processed surface is less than or equal to the threshold value, the electric spark processing point position is in the working state.

[0143] The threshold value is the discharge distance between the electric spark processing point position and the to-be-processed surface that meets the processing requirements.

[0144] The discharge end 101 includes multiple electrical discharge machining points arranged around the circumference of the workpiece. These multiple electrical discharge machining points can be continuously and uninterruptedly distributed around the circumference of the workpiece, or they can be discontinuously distributed around the circumference of the workpiece, as long as they can achieve continuous machining and forming of the annular groove on the workpiece surface.

[0145] In one possible implementation, one end of the tool electrode 10 is annular, meaning that multiple electrical discharge machining points arranged circumferentially around the workpiece form a continuous annular shape, such as... Figures 8-13 As shown, the inner circle of the ring matches the shape of the annular groove, that is, the inner circle is convex and the annular groove is concave. The cross-sectional dimensions of the convex shape are the same as the cross-sectional shape of the concave shape. The other end of the tool electrode 10 is a conductive end 104, which is electrically connected to an output end of a power supply device installed on the machine tool to introduce current and transmit the current to the inner circle. At this time, the inner circle is a discharge end 101, so that the annular groove on the surface to be processed can be processed through the working state of multiple electrical discharge machining points arranged around the circumference of the workpiece by the discharge end 101.

[0146] In one possible implementation, the discharge end 101 is a rigid structure, fitted onto the outer end face of the gas path body 1-2. Specifically, the gas path body 1-2 is a stainless steel tube. During processing, the stainless steel tube is electrically connected to another output end of the power supply device, and the tool electrode 10 moves eccentrically around the central axis of the inner cavity of the stainless steel tube; wherein, during the eccentric movement of the tool electrode 10, the distance between the inner circular end face of the discharge end 101 and the end face to be processed of the stainless steel tube is constantly changing; when the distance between the EDM point and the surface to be processed is greater than a threshold, the EDM point is in a non-working state, and at this time, the EDM point is a non-working end 103; when the distance between the EDM point and the surface to be processed is less than or equal to the threshold, the EDM point is in a working state, and at this time, the EDM point is a non-working end 103. The EDM machining point is the working end 102. In this way, the working state and non-working state can be changed at the same EDM machining point. The working state of all EDM machining points can jointly realize the machining of the annular groove on the workpiece surface. That is to say, the position of the working end 102 changes continuously within the inner circular end face of the discharge end 101. The circular discharge end of the tool electrode moves eccentrically around the central axis of the inner cavity of the stainless steel tube. All working ends form a continuous annular discharge end around the workpiece. In this way, the discharge end 101 of the tool electrode 10 is avoided to be in a continuous machining state, thereby reducing the wear of the tool electrode 10.

[0147] Among them, the annular discharge end 101 of the tool electrode 10 includes several working ends 102 distributed in a ring. When the discharge end moves eccentrically around the central axis of the inner cavity of the stainless steel tube for processing, the several working ends 102 are in a non-synchronous and non-continuous processing state; and the processing trajectories of the several working ends together constitute the annular groove of the workpiece to be processed.

[0148] Specifically, after the tool electrode 10 moves eccentrically for one revolution, all end faces of the discharge end 101 participate in electrical discharge machining. That is, all working ends 102 constitute a complete discharge end 101, and the machining trajectory of all working ends 102 constitutes an annular groove of the stainless steel tube. Along the deflection direction of the tool electrode 10, the working ends 102 exhibit a "circular motion" phenomenon on the discharge end 101. That is, the position of the working ends 102 is different at different times. In this way, all working ends 102 are processed alternately and in an orderly manner. The machining direction 16 is the circumferential direction around the outer end face of the stainless steel tube, and the plane containing this circumferential direction is perpendicular to the central axis of the inner cavity of the stainless steel tube.

[0149] The criterion for determining whether the discharge end 101 is the working end 102 is whether the distance between the discharge end 101 and the surface to be processed of the stainless steel tube is greater than 50μm. If not, the discharge end 101 is the working end 102; if so, the discharge end 101 is the non-working end 103.

[0150] Specifically, the tool electrode 10 is mounted on a machine tool. During machining, the machine tool drives the tool electrode 10 to make an eccentric motion, thereby enabling the discharge end 101 of the tool electrode to perform electrical discharge machining around the end face of the stainless steel tube. The machining direction 16 is the circumferential direction around the outer end face of the stainless steel tube, and the center line of this circumferential direction coincides with the central axis of the inner cavity of the stainless steel tube.

[0151] Specifically, before the tool electrode 10 makes an eccentric movement, it is necessary to adjust the center of the inner circle of the discharge end 101 of the tool electrode 10 to coincide with the central axis of the stainless steel tube, and there should be a margin gap between the discharge end 101 and the outer end face of the stainless steel tube. That is, the diameter of the inner circle of the discharge end 101 is larger than the outer diameter of the stainless steel tube. For example, the diameter of the inner circle is 10 to 20 mm, which is 5 to 10 times the outer diameter of the stainless steel tube. In this way, it is easy to determine the value of the single-sided feed rate O1O2 during the electrical discharge machining process.

[0152] Among them, the unilateral feed rate O1O2 satisfies:

[0153] O1O2=S1+(H1-H2)-S2

[0154] Wherein, O1 represents the center point of the discharge terminal 101 of the tool electrode 10;

[0155] O2 indicates the center point of the inner cavity of the stainless steel pipe;

[0156] H1 is the wall thickness of the stainless steel tube;

[0157] H2 is the wall thickness of the annular groove;

[0158] S1 is the excess gap between the discharge end 101 of the tool electrode 10 and the outer end surface of the stainless steel tube;

[0159] S2 is the machining gap, which refers to the closest distance between the working end 102 of the tool electrode 10 and the end surface of the stainless steel tube 01 when the tool electrode 10 is eccentrically moved.

[0160] wherein S1 satisfies:

[0161]

[0162] wherein S 11 , S 12 , S 13 , S 14 are the actual excess gap values between the four points selected on the discharge end 101 of the tool electrode 10 and the outer end surface of the stainless steel tube, and the four points are uniformly distributed on the discharge end 101.

[0163] For example, S 11 , S 12 , S 13 , S 14 are 2.055 mm, 2.060 mm, 2.065 mm, and 2.050 mm, respectively, and S1 = 2.058 mm.

[0164] wherein the machining gap S2 is 10-50 μm to meet the requirements of electric spark machining.

[0165] For example, S2 = 10 μm, H1 = 0.5 mm, H2 = 0.3 mm, and S1 = 2.058 mm, and in this case, O1O2 = 2.248 mm.

[0166] wherein the automatic centering module on the machine tool can be used to measure S 11 , S 12 , S 13 , S 14 , wherein if the four values are equal, the center of the inner circular end of the discharge end 101 of the tool electrode 10 coincides with the central axis in the inner cavity of the stainless steel tube.

[0167] wherein after adjusting the center of the discharge end 101 of the tool electrode 10 to coincide with the central axis in the inner cavity of the stainless steel tube using the machine tool, S 11 , S 12 , S 13 , S 14The closer the four values are, the more accurate the value of S1 is, and the more accurate the unilateral feed amount O1O2 is, so that the machining gap accuracy can be ensured during the eccentric movement of the tool electrode 10, and the machining depth of the working end 102 is ensured, so that the size accuracy of the annular groove being machined is ensured.

[0168] Specifically, after the center of the discharge end 101 of the tool electrode 10 is adjusted to coincide with the central axis of the inner cavity of the stainless steel pipe, the tool electrode 10 is driven to move eccentrically by the machine tool, and the detailed process is as follows.

[0169] The movement trajectories of the center point O1 of the discharge end 101 of the tool electrode 10 and the center point O2 of the inner cavity of the stainless steel pipe are described as follows:

[0170] The tool electrode 10 is moved so that O1 is away from O2 by a distance equal to the unilateral feed amount O1O2, and at this time, the distance between O1 and O2 is O1O2.

[0171] O1 is rotated around O2 with O1O2 as the radius, and at this time, the trajectory of O1 is a circle, as shown in Figure 14 , the center of the circle is O2, and the radius is O1O2.

[0172] In the process of moving O1, when the closest distance between the end face of the discharge end 101 and the surface of the stainless steel pipe reaches 10 μm, the power supply device is turned on to deliver pulse voltage to the tool electrode 10 and the stainless steel pipe, and the surface metal of the stainless steel pipe is etched away at a machining speed of 0.04 g / min until the distance between O1 and O2 is O1O2, and then O1 moves in a circular motion around O2.

[0173] In order to further illustrate the movement trajectory of the tool electrode 10, an arbitrary point O3 on the discharge end 101 is selected, and the trajectory of O3 is described as follows:

[0174] The tool electrode 10 is moved so that O3 moves towards O2 by a distance of O1O2.

[0175] When O1 rotates around O2, at this time, as shown in Figure 15 , the trajectory of O3 is a circle with the initial position of O3 as the center and O1O2 as the radius.

[0176] In the process of moving O3, when the closest distance between the end face of the discharge end 101 and the surface of the stainless steel pipe reaches 10 μm, the power supply device is turned on to deliver pulse voltage to the tool electrode 10 and the stainless steel pipe, and the surface metal of the stainless steel pipe is etched away at a machining speed of 0.04 g / min until the moving distance of O3 reaches O1O2, and then O3 moves in a circular motion around its initial position.

[0177] In this way, in the eccentric movement of the tool electrode 10, the distance between the inner circular end face of the discharge end 101 and the outer end face of the stainless steel pipe is constantly changing, the distance between each part of the inner circular end face of the discharge end 101 and the outer end face of the stainless steel pipe is realized from close to far, and then the discharge end 101 is converted from the working state to the non-working state, that is, the dynamic conversion between the working end 102 and the non-working end 103 is realized.

[0178] The discharge end 101 and the outer end face of the stainless steel pipe 01 have a clearance gap, which ensures that the non-machining gap between the non-working end 103 at the discharge end 101 and the end face of the stainless steel pipe is large enough, and then ensures that the pulse voltage released at the non-working end 103 cannot etch the metal on the surface of the stainless steel pipe. In this way, when the tool electrode 10 is eccentrically moved, the dynamic conversion of the working end 102 and the non-working end 103 can be realized.

[0179] The conductive end 104 of the tool electrode 10 is electrically connected to one output end of a power supply device provided on the machine tool, and the stainless steel pipe is electrically connected to the other output end of the power supply device, wherein the power supply device includes a pulse power supply, and the two output ends are respectively connected to the positive and negative electrodes of the pulse power supply to output pulse voltage.

[0180] During machining, the discharge end 101 of the tool electrode 10 and the stainless steel pipe are immersed in a liquid medium with a certain degree of insulation. For example, the medium is kerosene, mineral oil or deionized water. When the pulse voltage is applied to the discharge end 101 and the stainless steel pipe, the liquid medium at the closest point between the stainless steel pipe and the discharge end 101 at that time is broken down to form a discharge channel. Because the cross-sectional area of the channel is very small, the discharge time is very short, so that the energy is highly concentrated (10-10 6 W / mm), and the instantaneous high temperature generated in the discharge area is sufficient to melt or even evaporate the metal on the surface of the stainless steel pipe, so as to form a small pit. After the first pulse discharge ends, a second pulse breaks down the discharge at another closest point after a very short interval. In this way, the cycle is repeated at a high frequency, and the tool electrode 10 continuously feeds the stainless steel pipe, and its shape is finally replicated on the stainless steel pipe to form the required machined surface. During machining, although a small part of the total energy is also released to the tool electrode 10, causing the tool electrode 10 to be worn, but by eccentrically moving the discharge end 101 of the tool electrode 10 around the central axis of the inner cavity of the stainless steel pipe, the working end 102 at the discharge end 101 is constantly changing position, so as to reduce the wear of the tool electrode 10 by avoiding continuous machining of the working end 102, and then the working end 102 of the discharge end 101 maintains a relatively complete shape at each moment of machining, improving the machining precision.

[0181] For example, during machining, the electrical parameters satisfy:

[0182] The pulse width is 30-60μs, the pulse interval is 20-30μs, the average machining current is 0.8-2A, and the average machining voltage is 30-60V.

[0183] Specifically, during machining, the tool electrode 10 is controlled to eccentrically move by the machine tool, and the stainless steel pipe is kept stationary.

[0184] The tool electrode 10 is connected with a driving device arranged on the machine tool, and the driving device comprises a transmission rod 15. During machining, the machine tool controls the transmission rod 15 to swing, and the tool electrode 10 is driven to eccentrically move by the transmission rod 15.

[0185] Specifically, the transmission rod 15 swings clockwise in a swing plane ZY which is parallel to the plane where the discharge end 101 is located, so that the tool electrode 10 is eccentrically moved around the central axis of the inner cavity of the stainless steel pipe.

[0186] During machining, the non-electric parameters satisfy:

[0187] The swing speed of the transmission rod 15 is 0.4-0.6rpm, the machining gap is 10-50μm, the machining speed is 0.02-0.045g / min, and the single-side feeding amount is 2.214-2.316mm.

[0188] Specifically, as shown in Figure 16 the stainless steel pipe is clamped by placing it on the equal-height positioning blocks 12 and the auxiliary bearing blocks 13.

[0189] The two equal-height positioning blocks 12 are used to clamp the two sides of the to-be-machined position of the stainless steel pipe, so as to ensure the stability of the to-be-machined position of the stainless steel pipe during machining. For example, the distance between the two equal-height positioning blocks 12 is 30mm.

[0190] The two equal-height positioning blocks 12 are placed between the two auxiliary bearing blocks 13, and the two auxiliary bearing blocks 13 are used to support and position the two ends of the stainless steel pipe, so as to further ensure the stability of the stainless steel pipe during machining.

[0191] As shown in Figures 18-19 the upper end faces of the equal-height positioning blocks 12 and the auxiliary bearing blocks 13 are flush, and the upper end faces of the equal-height positioning blocks 12 and the auxiliary bearing blocks 13 are provided with V-shaped grooves, and the stainless steel pipe is placed in the V-shaped grooves to limit the stainless steel pipe.

[0192] Further, the clamping plate 14 is covered on the V-shaped grooves and is clamped on the equal-height positioning blocks 12 to limit the stainless steel pipe and further improve the stability of the stainless steel pipe. For example, the angle of the V-shaped groove is 60°-90°, and the depth is 5-10mm.

[0193] Wherein, before placing the stainless steel pipe on the equal-height positioning block 12, first need to use the machine tool to find the tool electrode 10, and then put the stainless steel pipe into the discharge end 101 of the tool electrode 10, and finally use the equal-height positioning block 12, the auxiliary bearing block 13 and the clamping plate 14 to clamp the stainless steel pipe, and find the stainless steel pipe through the equal-height positioning block 12 and the auxiliary bearing block 13.

[0194] Specifically, after the tool electrode 10 is found, the positions of the equal-height positioning block 12 and the auxiliary bearing block 13 on the machine tool are adjusted by the machine tool XYZ axis to find the stainless steel pipe, so as to ensure that the inner cavity axis of the stainless steel pipe coincides with the center line of the discharge end 101 of the tool electrode 10, so as to determine the value of the single-sided feed amount O1O2, and further improve the machining precision.

[0195] Wherein, the finding process of the stainless steel pipe is as follows.

[0196] First, first fix the two equal-height positioning blocks 12 and the two auxiliary bearing blocks 13 on the workbench 9 of the machine tool, and then use the dial indicator to find the parallelism of the side surface with the machine tool X axis, and the parallelism error is ≤0.01mm.

[0197] Before placing the stainless steel pipe on the equal-height positioning block 12, first put the stainless steel pipe into the discharge end 101 of the tool electrode 10, and then place the stainless steel pipe on the equal-height positioning block 12 and the auxiliary bearing block 13, so as to find the stainless steel pipe through the equal-height positioning block 12 and the auxiliary bearing block 13.

[0198] Wherein, one end of the transmission rod 15 is connected with the tool electrode 10, and is parallel to the center line of the discharge end 101 of the tool electrode 10; during the machining process, the other end of the transmission rod 15 is installed on the machine tool, so as to drive the transmission rod 15 to swing through the machine tool, and then drive the tool electrode 10 to move through the transmission rod 15, so as to realize the eccentric motion of the discharge end 101 of the tool electrode 10 around the inner cavity axis of the stainless steel pipe.

[0199] In this way, the discharge end 101 of the tool electrode 10 eccentrically moves around the inner cavity axis of the stainless steel pipe for one cycle, so as to complete the machining of the annular groove of the stainless steel pipe, realize one-time machining, and significantly improve the machining efficiency.

[0200] Compared with the prior art, the discharge end 101 of the tool electrode 10 of the present application comprises a plurality of electric spark machining point positions arranged circumferentially around the workpiece to be machined, the same electric spark machining point position comprises a working state and a non-working state, and when the tool electrode is electric spark machining on the annular groove of the workpiece to be machined, the distance between the electric spark machining point position and the machined surface is constantly changing, so that the working state and the non-working state are changed, and the working state of the plurality of electric spark machining point positions arranged circumferentially around the workpiece to be machined realizes the machining of the annular groove on the machined surface, so that the discharge end 101 of the tool electrode 10 is avoided to be in a continuous machining state, and the loss of the tool electrode 10 is reduced.

[0201] The plurality of electric spark machining point positions arranged circumferentially around the workpiece to be machined form a continuous circular ring, the inner circular end of the circular ring matches the shape of the annular groove, and the circular ring is eccentrically moved on the outer end surface of the stainless steel pipe, in this process, the distance between the inner circular end surface of the discharge end 101 and the machined surface is constantly changing; when the inner circular end surface of the discharge end 101 is close to the machined surface, the end surface of the discharge end 101 is the working end 102, and when the end surface is away from the machined surface, the end surface changes to the non-working end 103, so that the dynamic change between the working end 102 and the non-working end 103 is realized, the working end 102 of the tool electrode 10 is avoided to be in a continuous machining state, the loss of the working end 102 of the tool electrode 10 is greatly reduced, the loss of the tool electrode 10 is less than or equal to 1%, and the deformation of the working end surface of the tool electrode 10 is reduced, so that the machining precision of the annular groove of the stainless steel pipe is improved.

[0202] The discharge end 101 of the tool electrode 10 of the present application is eccentrically moved on the super-fine long stainless steel pipe, during machining, the distance between the discharge end 101 and the super-fine long stainless steel pipe changes from large to small, and then from small to large, in the process of changing from large to small, metal scraps are generated between the discharge end 101 and the stainless steel pipe, at this time, part of the metal scraps are discharged through the machining gap with the working fluid, in the process of changing from small to large, the distance between the discharge end 101 and the stainless steel pipe can be increased by nearly 200 times, the efficiency of discharging the metal scraps is significantly improved, so that the metal scraps are avoided to be accumulated at the discharge end 101 due to the discharging not being timely, thereby reducing the loss of the tool electrode 10, and avoiding the risk of short circuit caused by the tool electrode 10 being directly connected with the stainless steel pipe through the metal scraps.

[0203] By eccentrically moving the discharge end 101 of the tool electrode 10 on the super-fine long stainless steel pipe, the metal scraps can be efficiently discharged, and the electric spark machining is realized with a smaller machining gap, so that the machining current and the machining voltage value can be reduced, the machining cost is reduced, and the annular groove with lower surface roughness can be obtained.

[0204] As Figure 17As shown, by adjusting the value of the single-sided feed amount, the annular grooves of different wall thicknesses can be machined, and by adjusting the shape of the discharge end 101 of the tool electrode 10, the dimensions of different bevel angles alpha can be machined, laying a foundation for rapid production and batch production of products.

[0205] The discharge end 101 of the tool electrode 10 of the present application moves eccentrically around the central axis of the inner cavity of the ultra-slim stainless steel pipe for one cycle, thereby completing the machining of the annular groove of the ultra-slim stainless steel pipe, achieving one-time machining, and significantly improving the machining efficiency.

[0206] By eccentric movement of the discharge end 101 of the tool electrode 10 around the central axis of the inner cavity of the stainless steel pipe, the single-sided feed amount of each end face of the discharge end 101 is the same, ensuring the consistency of the machining depth of the annular groove, thereby improving the machining precision of the annular groove.

[0207] The discharge end 101 of the tool electrode 10 has the same shape as the annular groove, i.e., the discharge end 101 is convex, and the annular groove is concave. The cross-sectional dimension of the convex shape is the same as the cross-sectional shape of the concave shape. Therefore, after the discharge end 101 of the tool electrode 10 moves eccentrically around the central axis of the inner cavity of the ultra-slim stainless steel pipe for one cycle, the depth and bevel angle of the machined annular groove are the required annular groove depth and bevel angle, and the machining precision is significantly improved.

[0208] The present application discards the traditional turning machining method of the ultra-slim stainless steel pipe, and uses the working end 102 of the tool electrode 10 to discharge and remove the metal on the surface of the ultra-slim stainless steel pipe to machine the annular groove. That is, during the machining process, the tool electrode 10 does not contact the surface of the ultra-slim stainless steel pipe, and does not cause deformation, overcoming the problem of damage to the ultra-slim stainless steel pipe caused by cutting force.

[0209] The present application uses the discharge end 101 of the tool electrode 10 to move eccentrically around the central axis of the inner cavity of the ultra-slim stainless steel pipe to machine the annular groove of the ultra-slim stainless steel pipe. That is, during the machining process, the ultra-slim stainless steel pipe does not need to be moved, and the annular groove in the annular shape can be machined on the outer surface of the ultra-slim stainless steel pipe, overcoming the problem of poor coaxiality during the rotation of the ultra-slim stainless steel pipe, which affects the machining precision.

[0210] During machining, the ultra-slim stainless steel pipe is only placed in the V-shaped groove on the equal-height positioning block 12 and the auxiliary bearing block 13, and the upper surface of the ultra-slim stainless steel pipe is limited by the clamping plate 14, so that the clamping and positioning of the ultra-slim stainless steel pipe can be realized. The clamping is convenient, and the stability of the ultra-slim stainless steel pipe during machining can be ensured.

[0211] The specific steps are as follows:

[0212] Step 1: Adjust the position of the tool electrode 10 by using the machine tool, so that the plane where the discharge end 101 of the tool electrode 10 is located is perpendicular to the worktable surface 11 of the machine tool;

[0213] Specifically, the worktable surface 11 of the machine tool is a horizontal plane, and the tool electrode 10 is vertically installed on the machine tool and connected with a transmission rod installed on the machine tool.

[0214] Step 2: Clamping the gas path body 1-2 by using the bearing assembly and aligning the gas path body 1-2.

[0215] Specifically, the gas path body 1-2 is a stainless steel pipe. First, fix two pieces of equal-height positioning blocks 12 and two pieces of auxiliary bearing blocks 13 on the worktable surface 11, and use a dial indicator to align the side surface parallel to the X-axis of the machine tool, and adjust the position of the equal-height positioning blocks 12 and the auxiliary bearing blocks 13 by using the machine tool, wherein the parallelism error is ≤0.01mm.

[0216] Then place the stainless steel pipe on the equal-height positioning blocks 12, and before placing, first pass the stainless steel pipe through the inner circle end of the lower end of the tool electrode 10, and ensure that the stainless steel pipe is in a horizontal position through the equal-height positioning blocks 12, and the distance between the two equal-height positioning blocks 12 is 30mm.

[0217] Then place the two ends of the stainless steel pipe on the auxiliary bearing blocks 13, and finally fix it with a clamping plate 14.

[0218] Step 3: Adjust the center line of the discharge end 101 of the tool electrode 10 to coincide with the central axis of the inner cavity of the stainless steel pipe by using the machine tool.

[0219] Specifically, first, adjust the position of the stainless steel pipe by moving the bearing assembly in the X-axis direction by using the machine tool, so that the to-be-processed position of the stainless steel 6 is located in the discharge end 101 of the tool electrode 10.

[0220] Then, by using the automatic centering module of the machine tool, measure the values of S 11 , S 12 , S 13 , S 14 If the four values are equal or the error is within ±0.02mm, the center of the discharge end 101 of the tool electrode 10 coincides with the central axis of the inner cavity of the stainless steel pipe, if not, continue to adjust the position of the bearing assembly by using the machine tool until the requirements are met.

[0221] Step 4: Use kerosene and water as working fluid, and use the tool electrode 10 to perform electric spark machining on the stainless steel pipe.

[0222] Specifically, step 4 includes the following steps:

[0223] Step 41: control the eccentric movement of the discharge end 101 of the tool electrode 10 around the central axis of the inner cavity of the stainless steel pipe;

[0224] Specifically, the machine tool drives the transmission rod 15 to swing in the YZ plane, and then controls the eccentric movement of the discharge end 101 of the tool electrode 10 around the central axis of the inner cavity of the stainless steel pipe through the transmission rod 15. The eccentric movement direction 17 is shown in Figure 14 .

[0225] The swing speed of the transmission rod 15 is 0.5 rpm;

[0226] S 11 、S 12 、S 13 、S 14 The actual measured values are 2.055 mm, 2.060 mm, 2.065 mm, and 2.050 mm, and at this time, S1=2.058 mm;

[0227] The processing gap S2 is 10 μm;

[0228] The single-sided feed amount O1O2=S1+(H1-H2)-S2=2.058+(0.5-0.3)-0.01=2.248 mm;

[0229] The processing speed is 0.04 g / min.

[0230] Step 42: when the tool electrode 10 moves eccentrically, the tool electrode 10 is powered to perform electric spark machining.

[0231] Specifically, the electrical parameters satisfy:

[0232] The pulse width is 40 μs, the pulse interval is 26 μs, the average processing current is 1 A, and the average processing voltage is 40 V.

[0233] The above processing method is used to process the annular grooves of #01-#10 ultra-fine long stainless steel pipes, and the processing parameters are shown in Table 1.

[0234] Table 1 Processing parameters

[0235]

[0236]

[0237] Processing requirements: the wall thickness of the annular groove is 0.3±0.05 mm, and the bevel angle α is 90°. The detection results are shown in Table 2.

[0238] Table 2 Detection results

[0239]

[0240]

[0241] Wherein, the electrode consumption ratio is E / W*100%, wherein, E is the diameter size variation of the discharge end of the tool electrode, and W is the initial diameter size of the inner end of the tool electrode.

[0242] As shown in Table 2, the average value of the groove depth of the annular grooves of the 10 pieces of stainless steel pipes processed by the present application is 0.2146mm, the standard deviation is 0.01427, the dispersion coefficient is 0.07, the annular groove angle is 90°, the average value of the annular groove wall thickness is 0.299mm, the standard deviation is 0.006681, and the dispersion coefficient is 0.02. It can be seen that the processing method of the present application can realize the annular groove processing of the ultra-fine long stainless steel pipe, and the processed annular groove has high precision and stability, does not damage the ultra-fine long stainless steel pipe, and has small tool electrode consumption.

[0243] Generally, the ratio of diameter to length reaches 1:100-150, which belongs to the ultra-fine long shaft. For example, the outer diameter of the stainless steel pipe used in a certain aviation product is 2mm, the inner diameter is 1mm, and the length is 1-1.2m. The ratio of the outer diameter to the length of the stainless steel pipe is 1:500-600, which belongs to the ultra-fine long stainless steel pipe. Generally, an annular groove needs to be processed on the ultra-fine long steel pipe. The annular groove is an annular groove, which is used to separate the product fairing body from the product guidance system when the product reaches the predetermined height and position.

[0244] Due to the small diameter and thin wall thickness of the ultra-fine stainless steel pipe, and the wall thickness of the annular groove position is even thinner, such as 0.3±0.05mm, the important dimensions cannot be obtained by direct measurement. When a V-shaped annular groove is processed at a certain position of the ultra-fine long stainless steel pipe, it is difficult to ensure the wall thickness size of the annular groove position by using the traditional turning processing method. This is because the longer the length, the greater the centrifugal force caused by the rotation of the workpiece, and the worse the coaxiality of the workpiece. In addition, the cutting force generated is easy to cause deformation of the ultra-fine long stainless steel pipe.

[0245] If the existing electric spark processing device is used to process the annular groove of the ultra-fine long stainless steel pipe, the ultra-fine long stainless steel pipe needs to be rotated, and then the tool electrode is used to continuously advance on the surface of the ultra-fine long stainless steel pipe for processing. However, due to the length of the ultra-fine long stainless steel pipe, the centrifugal force caused by the rotation of the workpiece will be greater, and the coaxiality of the workpiece will be worse, which will also make it difficult to ensure the wall thickness size of the annular groove position. In addition, part of the total energy is released to the tool electrode during processing, which will cause tool consumption. The shape of the consumed tool electrode is finally replicated on the ultra-fine long stainless steel pipe, which seriously affects the processing precision of the annular groove.

[0246] The wall thickness of the annular groove position is thin, the positioning requirement and the machining precision requirement are relatively high, and the important dimension cannot be obtained by direct measurement; when the annular groove is machined at a certain position of the ultra-fine long stainless steel pipe, it is difficult to guarantee the wall thickness dimension of the annular groove position by using the traditional turning machining device, and even if the existing electric spark machining device is used, it is also difficult to guarantee the wall thickness dimension of the annular groove position.

[0247] The annular groove is completed by using the following machining device. The machining device comprises a tool electrode 10, a bearing assembly and a driving assembly installed on a machine tool, wherein the bearing assembly is used for clamping the stainless steel pipe, and the driving assembly is used for driving the tool electrode 10 to eccentrically move around the central axis of the inner cavity of the stainless steel pipe, so as to realize electric spark machining of the annular groove of the stainless steel pipe, thereby solving the problem that the annular groove is difficult to be machined on the ultra-fine long stainless steel pipe.

[0248] Specifically, one end of the tool electrode 10 is in the form of a circular ring, the inner circle end of the circular ring is matched with the shape of the annular groove, the other end of the tool electrode 10 is a conductive end 104, which is electrically connected with an output end of a power supply device arranged on the machine tool, so as to introduce current and transmit the current to the inner circle end, at this time, the inner circle end is a discharge end 101, which is sleeved on the outer end surface of the stainless steel pipe; during machining, the stainless steel pipe is electrically connected with another output end of the power supply device, and the discharge end 101 of the tool electrode 10 eccentrically moves around the central axis of the inner cavity of the stainless steel pipe, wherein during the eccentric movement of the tool electrode 10, the distance between the end surface of the discharge end 101 and the end surface of the stainless steel pipe to be machined is constantly changing, the distance of 10-50 μm is the working state, i.e. the working end 102, and the distance greater than 50 μm is the non-working state, i.e. the non-working end 103. Wherein, all the machining tracks of the working ends 102 together constitute the annular groove of the ultra-fine long stainless steel pipe.

[0249] Wherein, the center of the inner circle end of the discharge end 101 of the tool electrode 10 coincides with the central axis of the inner cavity of the stainless steel pipe, and there is a clearance between the discharge end 101 and the outer end surface of the stainless steel pipe, wherein the diameter of the end surface of the discharge end 101 is 20 mm, which is 10 times of the outer diameter of the stainless steel pipe, so as to facilitate the determination of the value of the single-sided feed amount O1O2; during machining, the tool electrode 10 is swung by the driving assembly, at this time, the discharge end 101 of the tool electrode 10 is in the eccentric movement state around the central axis of the inner cavity of the stainless steel pipe.

[0250] Wherein, the automatic centering module on the machine tool is used to measure S 11 , S 12 , S 13 , S 14 are respectively 2.055 mm, 2.060 mm, 2.065 mm, 2.050 mm, at this time, S1=2.058 mm.

[0251] Wherein, S2=10μm; H1=0.5mm, H2=0.3mm, S1=2.058mm, at this time, O1O2=2.248mm.

[0252] Wherein, after the center of the discharge end 101 of the tool electrode 10 is adjusted to coincide with the inner cavity axis of the stainless steel pipe, the tool electrode 10 is in eccentric motion state under the action of the driving assembly.

[0253] Wherein, the conductive end 104 of the tool electrode 10 is electrically connected with an output end of the power supply device arranged on the machine tool, and the stainless steel pipe is electrically connected with another output end of the power supply device, wherein the power supply device includes a pulse power source, and the two output ends are respectively connected with the positive and negative poles of the pulse power source to output pulse voltage.

[0254] Wherein, during the machining process, the electrical parameters satisfy:

[0255] The pulse width is 40μs, the pulse interval is 26μs, the average machining current is 1A, and the average machining voltage is 40V.

[0256] Specifically, the above-mentioned driving assembly includes a transmission rod 15, one end of the transmission rod 15 is connected with the tool electrode 10, and the other end of the transmission rod 15 is installed on the machine tool, and the transmission rod 15 can be controlled to swing through the machine tool, so as to drive the discharge end 101 of the tool electrode 10 to make eccentric motion around the inner cavity axis of the stainless steel pipe. Wherein, the stainless steel pipe remains stationary during machining.

[0257] Wherein, during the machining process, the non-electrical parameters satisfy:

[0258] The swing speed of the transmission rod 15 is 0.5rpm, the machining gap S2 is 10μm, the machining speed is 0.04g / min, and the single-sided feed amount O1O2 is 2.248mm.

[0259] Specifically, the bearing assembly includes an equal-height positioning block 12 and an auxiliary bearing block 13 installed on the machine tool, so as to place the stainless steel pipe on the equal-height positioning block 12 and the auxiliary bearing block 13 to clamp the stainless steel pipe.

[0260] Wherein, two equal-height positioning blocks 12 are provided, and the two equal-height positioning blocks 12 are respectively located on both sides of the to-be-machined position of the stainless steel pipe, and the distance between the two equal-height positioning blocks 12 is 30mm.

[0261] Wherein, two auxiliary bearing blocks 13 are provided, and the two equal-height positioning blocks 12 are located between the two auxiliary bearing blocks 13, so as to support and position the two ends of the stainless steel pipe through the two auxiliary bearing blocks 13.

[0262] The upper end faces of the equal-height positioning block 12 and the auxiliary bearing block 13 are flush, and the upper end faces of the equal-height positioning block 12 and the auxiliary bearing block 13 are provided with V-shaped grooves, and the stainless steel pipe is placed in the V-shaped grooves to limit the stainless steel pipe.

[0263] Further, the equal-height positioning block 12 is further provided with a clamping plate 14, the clamping plate 14 covers the V-shaped groove and is clamped on the equal-height positioning block 12 to limit the stainless steel pipe and further improve the stability of the stainless steel pipe. For example, the angle of the V-shaped groove is 90°, and the depth is 10mm.

[0264] Wherein, before placing the stainless steel pipe on the equal-height positioning block 12, first need to find the tool electrode 10, and then put the stainless steel pipe into the discharge end 101 of the tool electrode 10, finally use the equal-height positioning block 12, auxiliary bearing block 13 and clamping plate 14 to clamp the stainless steel pipe, and through the equal-height positioning block 12 and auxiliary bearing block 13 to find the stainless steel pipe.

[0265] Wherein, one end of the transmission rod 15 is connected with the tool electrode 10, and is parallel to the center line of the discharge end 101 of the tool electrode 10; in the process of machining, the other end of the transmission rod 15 is installed on the machine tool, so that the machine tool drives the transmission rod 15 to swing, and then drives the tool electrode 10 to move, so as to realize the eccentric motion of the discharge end 101 of the tool electrode 10 around the central axis of the inner cavity of the stainless steel pipe.

[0266] In this way, the discharge end 101 of the tool electrode 10 eccentrically moves around the central axis of the inner cavity of the stainless steel pipe for one cycle, which can complete the machining of the annular groove of the stainless steel pipe, realize one-time machining, and significantly improve the machining efficiency.

[0267] Example seven

[0268] Because the weak part 7 is provided on the gas path main body 1-2, it is easy to cause the breakage of the weak part in the subsequent turnover and machining process. Based on the above consideration, the embodiment provides a protection tool 8 for protecting the weak part in the third embodiment.

[0269] As shown in Figure 6 The protection tool includes a protection main body 8-1 and a pressing member 8-2, the protection main body 8-1 is used for accommodating the weak part 7 on the gas path main body 1-2, and the pressing member 8-2 is used for fixing the gas path main body 1-2 in the protection main body 8-1 to realize the fixation of the weak part 7. The pressing member 8-2 is sleeved on the protection main body 8-1.

[0270] Specifically, one end of the protection main body 8-1 is closed, and a through groove 8-4 is provided on the protection main body 8-1 in the radial direction of the protection main body 8-1, one end of the gas path main body 1-2 passes through the through groove 8-4, and the weak part 7 is located in the through groove 8-4.

[0271] In view of the long air path body 1-2, if one end of the air path body 1-2 needs to pass through the through slot to place the weak part in the through slot, the operation is inconvenient. Therefore, in a preferred embodiment, the through slot 8-4 extends from one end of the protection body 8-1 to the other end of the protection body 8-1, so that the other end of the protection body 8-1 is an open end. Since the through slot 8-4 extends from one end of the protection body 8-1 to the other end of the protection body 8-1, during use, without the need to pass one end of the air path body 1-2 through the through slot, only the weak part 7 needs to be inserted from the opening at the other end of the protection body 8-1 to achieve that the weak part 7 is located in the through slot 8-4, greatly improving the convenience of operation.

[0272] In a possible embodiment, the compression member 8-2 is provided with a through hole for the protection body to pass through. The compression member 8-2 and the protection body 8-1 are threadedly connected. Exemplarily, the outer surface of the protection body is provided with external threads, and the through hole of the compression member is provided with internal threads.

[0273] Preferably, the protection tool further comprises a locking member 8-3. The locking member 8-3 is arranged on the outside of the compression member 8-2, close to the open end of the protection body 8-1, for preventing the compression member 8-2 from loosening, thereby preventing the weak part from moving out of the through slot 8-4 of the protection body 8-1. The structure of the locking member 8-3 can be the same as that of the compression member, or other structures can be adopted as long as they can prevent the compression member from loosening.

[0274] In order to reduce the processing difficulty, the protection body 8-1 of the present embodiment can adopt a bolt, and an axial through slot is formed by machining a through slot on the screw rod along the length direction, and the locking member and the compression member can both adopt a nut.

[0275] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by a computer program instructing relevant hardware, and the program can be stored in a computer readable storage medium, wherein the computer readable storage medium is a disk, an optical disk, a read-only memory or a random access memory, etc.

[0276] The present application provides a new pipe structure capable of meeting the functions of ventilation and sending electric signals by analyzing the narrow space and the corresponding functional requirements. The selection of a plurality of small-diameter stainless steel pipes to form the pipe body and the sleeve assembly can meet the minimum space and positioning requirements. The selection of the thermocouple wire structure can meet the insulation requirements. The novel and reasonable setting of the corresponding pipe welding, sleeve and bending steps, as well as the insulation detection for each step, can effectively form the pipe shape and simultaneously ensure the insulation performance of the parts, achieving the two functions of ventilation and sending electric signals of the pipe.

[0277] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A pipe connection fitting, characterized by, The connecting joint comprises a connecting body; an axial through hole is arranged on the connecting body, and the through hole is used for passing gas; A first groove is arranged on the end face of the connecting body, and the first groove is used for placing a thermocouple to realize a power signal; The first groove is communicated with the through hole, and a node of the thermocouple is suspended at the communication position of the first groove and the through hole; The connecting joint is a connecting joint meeting the dual requirements of air passage and power supply in a narrow cabin of aerospace, and further comprises a protrusion; the protrusion is used for limiting, and the protrusion is arranged at one end of the connecting body and is arranged along the outer surface of the connecting body in a circumferential direction; The protrusion is provided with a radial open slot for passing the thermocouple and installing a pipeline; The open slot comprises a first open slot and a second open slot; the first open slot and the second open slot are alternately and uniformly distributed in a circumferential direction; The first open slot and the second open slot are both two; A second groove for placing the thermocouple is arranged on the side surface of the connecting body, the second groove is parallel to the axial direction of the connecting body, and extends from one end of the connecting body to the other end; The second groove is communicated with the first groove; Two first open slots are respectively communicated with two second grooves to facilitate the passing of the thermocouple; two second open slots are used for the overall installation of the pipeline; An insulating coating is arranged on the end face of the connecting body provided with the first groove to prevent the connecting body from being in conduction with the thermocouple.

2. The tubing connection fitting of claim 1, wherein The number of the second grooves is two, and the two second grooves are arranged symmetrically with respect to the axial direction of the through hole.

3. The plumbing connection of claim 1, wherein, The length of the first groove is equal to the outer diameter of the connecting body.

4. The tubing connection of claim 3, wherein The first groove is in the shape of a "one" character.

5. The tubing connection of claim 1, wherein The material of the connecting body is a high-temperature-resistant alloy material.

6. The plumbing connection of claim 1, wherein, An external thread is arranged on the connecting body to connect with other components.

7. A pipe, characterized in that The connecting joint comprises a connecting body; an axial through hole is arranged on the connecting body, and the through hole is used for passing gas; A first groove is arranged on the end face of the connecting body, and the first groove is used for placing a thermocouple to realize a power signal; The first groove is communicated with the through hole, and a node of the thermocouple is suspended at the communication position of the first groove and the through hole; The connecting joint is a connecting joint meeting the dual requirements of air passage and power supply in a narrow cabin of aerospace, and further comprises a protrusion; the protrusion is used for limiting, and the protrusion is arranged at one end of the connecting body and is arranged along the outer surface of the connecting body in a circumferential direction; The protrusion is provided with a radial open slot for passing the thermocouple and installing a pipeline; The open slot comprises a first open slot and a second open slot; the first open slot and the second open slot are alternately and uniformly distributed in a circumferential direction; The first open slot and the second open slot are both two; A second groove for placing the thermocouple is arranged on the side surface of the connecting body, the second groove is parallel to the axial direction of the connecting body, and extends from one end of the connecting body to the other end; The second groove is communicated with the first groove; Two first open slots are respectively communicated with two second grooves to facilitate the passing of the thermocouple; two second open slots are used for the overall installation of the pipeline; An insulating coating is arranged on the end face of the connecting body provided with the first groove to prevent the connecting body from being in conduction with the thermocouple. The number of the second grooves is two, and the two second grooves are arranged symmetrically with respect to the axial direction of the through hole. The length of the first groove is equal to the outer diameter of the connecting body. The first groove is in the shape of a "one" character. The material of the connecting body is a high-temperature-resistant alloy material. An external thread is arranged on the connecting body to connect with other components.

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