CN106525341A - High-pressure gas detection joint for micro-diameter thin-walled tubes of heat exchangers - Google Patents

Abstract

A high-pressure gas detection joint used for micro-diameter thin-walled tubes of heat exchangers, which is composed of a primary joint (1), a shunt pipe (2), a plug (3), a secondary joint (4), and a secondary joint The nut (5) and the sealing joint (6) are composed of six parts; the first-level joint (1), the second-level joint (4) and the plug (3) are respectively assembled and welded to the shunt pipe (2); the sealing joint The outer conical surface of (6) and the inner conical surface of the secondary joint (4) are installed in contact with each other, and are fixed through the thread cooperation of the secondary joint (4) and the secondary joint nut (5); at the same time, the micro-diameter thin-walled pipe ( 7) Insert into the inner circular hole of the sealing joint (6), and fix it by the axial extrusion force of the conical surface of the secondary joint (4); the present invention is convenient for assembly and disassembly; the air tightness is guaranteed; No damage will be produced during the process, which not only improves the inspection quality of the thin-walled tube, but also makes it easy to observe the inspection results, thereby improving work efficiency.

Description

A high-pressure gas detection joint for micro-diameter thin-walled tubes of heat exchangers

technical field

The invention relates to a high-pressure gas detection joint used for micro-diameter thin-walled tubes of heat exchangers, which is suitable for connecting and sealing the micro-diameter thin-walled tubes and high-pressure gas sources for detecting the quality of the thin-walled tubes. It belongs to the field of aerospace science and technology.

Background technique

With the continuous improvement of aero-engine power, the aero-engine heat exchanger is an important system for cooling and heat dissipation, and its cooling effect directly affects the heat dissipation effect of the engine and its power, economy, and reliability. Therefore, more and more attention has been paid to the development of efficient aero-engine heat exchangers. The heat exchanger contains a large number of dense micro-diameter thin-walled tubes, and its quality not only directly affects the heat exchange efficiency of the heat exchanger, but also has a great impact on the safe operation of the entire aero-engine.

Since the micro-diameter thin-walled tube is obtained by multi-pass drawing technology, there may be some micro-cracks on the surface of the thin-walled tube, which will cause leakage when high-pressure gas is introduced. At present, the methods of detecting the quality of micro-diameter thin-walled tubes include: visual inspection; high-pressure liquid detection; high-pressure gas detection. Among them, although the high-pressure gas detection method is relatively complicated, especially the gas sealing problem needs to be considered, its detection effect is the best, and it is more in line with the use environment of the heat exchanger.

According to the actual working conditions of the heat exchanger, it is necessary to design a high-pressure gas detection joint, which is used to connect the high-pressure gas source and the micro-diameter thin-walled tube, so that the high-pressure gas from the high-pressure gas source can pass into the micro-diameter tube without leakage. Thin-walled tube, a high-pressure environment is established inside the thin-walled tube to test its quality. At present, there is no detection joint that can meet the requirements for leak-free connection of high-pressure gas sources and micro-diameter thin-walled pipes. The invention provides a high-pressure gas detection joint used for micro-diameter thin-walled tubes of heat exchangers to solve the existing problems.

Contents of the invention

(1. Purpose

The purpose of the present invention is to provide a high-pressure gas detection joint for the micro-diameter thin-walled tube of the heat exchanger, which can make the high-pressure gas of the gas cylinder pass smoothly into the micro-diameter thin-walled tube for detecting whether there are micro-cracks, and ensure the detection No leakage at joints during the process. It overcomes the uneasy sealing of high-pressure gas and has the characteristics of quick assembly and disassembly.

(2) Technical solution

The present invention is a kind of high-pressure gas detection joint that is used for micro-diameter thin-walled tube of heat exchanger, see Fig. 1; , sealing joint 6, composed of six parts; their mutual positional relationship is: a first-level joint 1, a second-level joint 4 and a plug 3 are respectively assembled and welded to the shunt pipe 2; the outer conical surface of the sealing joint 6 and The inner conical surface of the secondary joint 4 is in contact with the installation, and is fixed through the screw fit of the secondary joint 4 and the secondary joint nut 5; at the same time, the micro-diameter thin-walled tube 7 is inserted into the inner circular hole of the sealing joint 6, and passed through the secondary joint 4 The axial extrusion force of the conical surface is fixed;

The shape and structure of the primary joint 1 is as follows: first process a stepped cylinder, then process a through hole along the axis, process a thread on the larger diameter outer cylindrical surface and process a conical surface on the end surface;

The shape and structure of the shunt pipe 2 is as follows: first, a long circular tube is processed, a through hole is processed on one side of the long circular tube, and ten through holes are processed on the other side;

The shape and structure of the plug 3 is: it is a stepped cylinder, and the stepped surface is used to cooperate with the shunt pipe 2 for sealing;

The shape and structure of the secondary joint 4 is as follows: first process a stepped cylinder, then process a through hole along the axis, process a thread on the larger-diameter outer cylindrical surface and process a conical surface on the end surface;

The shape and structure of the secondary joint nut 5 is: first process a hexagonal prism, then drill a blind hole and thread from one end surface, and then process a small through hole on the other end surface of the hexagonal prism for passing through the micro-diameter thin-walled tube 7;

The shape and structure of the sealing joint 6 is as follows: first, two conical surfaces are cut symmetrically at both ends of the cylindrical surface, and then a through hole is processed along the axis of the cylinder for inserting the micro-diameter thin-walled tube 7 .

When the high-pressure gas detection joint works, firstly, the conical surface of the primary joint 1 is connected with the high-pressure gas source; The outer conical surface of the second-level joint 4 is vertically pushed into the inner conical surface of the secondary joint 4. Finally tighten the mating threads of the secondary joint 4 and the secondary joint nut 5, so that the sealing joint 6 is subject to axial extrusion force, ensuring that the secondary joint 4 and the sealing joint 6 form an external seal, and the sealing joint 6 and the micro-diameter The thin-walled tube 7 forms an internal seal.

Wherein, the diameter of the step-shaped cylindrical body of the primary joint 1 is respectively and The outer diameter of the external thread is Pitch 1.5mm; the center is a diameter of The through hole of the larger diameter outer cylindrical end surface has a conical surface with an angle of 37°.

Wherein, the outer diameter and inner diameter of the shunt pipe 2 are respectively and side with a through holes on the other side with ten through holes.

Wherein, the diameter of the stepped cylinder of the plug 3 is respectively and The step height is 10mm.

Wherein, the diameter of the stepped cylinder of the secondary joint 4 is respectively and The outer diameter of the external thread is The pitch is 1.5mm. The center is the diameter of The through hole of the larger diameter outer cylindrical end surface has a conical surface with an angle of 30°.

Wherein, the outer wall of the secondary joint nut 5 is a regular hexagon of M18, with a total length of 20 mm; the diameter of the internal thread on one end face is The pitch is 1.5mm, the thread length is 15mm; there is a through holes.

Among them, the diameter of the central through hole of the sealing joint 6 The two ends are sealing cones with an angle of 30°, and the middle is the diameter cylinder.

(3) Advantages and efficacy

The present invention is based on the problem of difficult detection of high-pressure gas seals in micro-diameter thin-walled tubes of heat exchangers. It is the first to propose a high-pressure gas detection joint for thin-walled tubes. The advantages are mainly reflected in: the detection joints are composed of six types of parts, of which parts 1, 2, 3, and 4 are welded together, which is convenient for assembly and disassembly; the sealing end surface adopts the form of a conical surface, which ensures the gas tightness between the high-pressure gas source and the thin-walled tube; 10 secondary joints are welded on the shunt tube , to ensure that 10 thin-walled pipes can be pressure-tested each time, which improves work efficiency; the installation of the detection joint and the high-pressure gas detection process will not cause any damage to the joints of the thin-walled pipes. This high-pressure gas detection method for thin-walled pipes not only improves the detection quality of thin-walled pipes, but also makes it easy to observe the detection results and improves work efficiency.

Description of drawings

Figure 1 is a schematic diagram of the assembly of the high-pressure gas detection joint of the present invention.

Fig. 2 Schematic diagram of the secondary joint nut of the present invention.

Fig. 3 is a schematic diagram of the secondary joint of the present invention.

Fig. 4 is a schematic diagram of the plug of the present invention.

Fig. 5 is a schematic diagram of the primary joint of the present invention.

Fig. 6 is a schematic diagram of the sealing joint of the present invention.

Fig. 7 is a schematic diagram of the shunt tube of the present invention.

The serial numbers in the figure are explained as follows:

1. Primary joint 2. Shunt tube 3. Plug 4. Secondary joint 5. Secondary joint nut 6. Sealing joint 7. Micro-diameter thin-walled tube

detailed description

See Fig. 1-Fig. 7, the present invention is a kind of high-pressure gas detection joint that is used for micro-diameter thin-walled tube of heat exchanger, it mainly comprises primary joint 1, shunt pipe 2, plug 3, secondary joint 4, secondary Joint nut 5, sealing joint 6 parts; their mutual positional relationship is: the first-level joint 1, the second-level joint 4 and the plug 3 are respectively assembled and welded on the shunt pipe 2; the outer conical surface of the sealing joint 6 and the second-level The inner conical surface of the joint 4 is in contact with the installation, and is fixed by the screw fit of the second joint 4 and the second joint nut 5; at the same time, the micro-diameter thin-walled tube 7 is inserted into the inner circular hole of the sealing joint 6, and passes through the conical joint of the second joint 4. The surface axial extrusion force is fixed.

When the high-pressure gas detection joint is working, firstly, the conical surface of the primary joint 1 is connected to the high-pressure gas source, and then the micro-diameter thin-walled tube 7 is inserted into the secondary joint nut 5 and the sealing joint 6 in turn, and then the sealing joint is The outer conical surface of 6 vertically pushes into the inner conical surface of the secondary joint 4. Finally tighten the mating threads of the secondary joint 4 and the secondary joint nut 5, so that the sealing joint 6 is subject to axial extrusion force, ensuring that the secondary joint 4 and the sealing joint 6 form an external seal, and the sealing joint 6 and the micro-diameter The thin-walled tube 7 forms an internal seal.

Wherein, the diameter of the step-shaped cylindrical body of the primary joint 1 is respectively and The outer diameter of the external thread is The pitch is 1.5mm. The center is the diameter of The through hole of the larger diameter outer cylindrical end surface has a conical surface with an angle of 37°.

Wherein, the shunt pipe 2 has an outer diameter and an inner diameter of and side with a through holes on the other side with ten through holes.

Wherein, the diameter of the stepped cylinder of the plug 3 is respectively and The length is 10mm.

Wherein, the diameter of the stepped cylinder of the secondary joint 4 is respectively and The outer diameter of the external thread is The pitch is 1.5mm. The center is the diameter of The through hole of the larger diameter outer cylindrical end surface has a conical surface with an angle of 30°.

Wherein, the outer wall of the secondary joint nut 5 is a regular hexagon of M18, with a total length of 20 mm; the diameter of the internal thread on one end face is The pitch is 1.5mm, the thread length is 15mm; there is a through holes.

Among them, the diameter of the central through hole of the sealing joint 6 The two ends are sealing cones with an angle of 30°, and the middle is the diameter cylinder.

Claims (7)

1. A high-pressure gas detection joint for heat exchanger micro-diameter thin-walled tubes is characterized in that: it is composed of a first-level joint (1), a shunt pipe (2), a plug (3), a second-level joint ( 4), secondary joint nut (5) and sealing joint (6), composed of six parts; the primary joint (1), secondary joint (4) and plug (3) are respectively assembled and welded to the shunt pipe ( 2) above; the outer conical surface of the sealing joint (6) is installed in contact with the inner conical surface of the secondary joint (4), and is fixed through the thread cooperation of the secondary joint (4) and the secondary joint nut (5); at the same time, The micro-diameter thin-walled tube (7) is inserted into the inner circular hole of the sealing joint (6), and is fixed by the axial extrusion force of the conical surface of the secondary joint (4); The shape and structure of the first-stage joint (1) is: first process a stepped cylinder, then process a through hole along the axis, process a thread on the large-diameter outer cylindrical surface and process a conical surface on the end surface ; The shape and structure of the shunt pipe (2) is: first process a long round tube, process a through hole on one side of the long round tube, and process ten through holes on the other side; The shape and structure of the plug (3) is: it is a stepped cylinder, and the stepped surface is used to cooperate with the shunt pipe (2) for sealing; The shape and structure of the secondary joint (4) is: first process a stepped cylinder, then process a through hole along the axis, process a thread on the large-diameter outer cylindrical surface and process a conical surface on the end surface ; The shape and structure of the secondary joint nut (5) is: first process a hexagonal prism, then drill a blind hole and thread from one end surface, and then process a small through hole on the other end surface of the hexagonal prism for passing through the microdiameter Thin-walled tube (7); The shape and structure of the sealing joint (6) is as follows: first, two conical surfaces are cut symmetrically at both ends of the cylindrical surface, and then a through hole is processed along the axis of the cylinder for inserting the micro-diameter thin-walled pipe (7); When the high-pressure gas detection joint is working, firstly, the conical surface of the first-level joint (1) is connected to the high-pressure gas source, and then the micro-diameter thin-walled tube is sequentially inserted into the second-level joint nut (5) and the sealing joint (6) , then let the outer conical surface of the sealing joint (6) vertically push into the inner conical surface of the secondary joint (4), and finally tighten the matching threads of the secondary joint (4) and the secondary joint nut (5) to make the sealing The joint (6) is subjected to axial extrusion force, which ensures that the secondary joint (4) and the sealing joint (6) form an external seal, and at the same time, the sealing joint (6) and the micro-diameter thin-walled pipe (7) form an internal seal. 2. A high-pressure gas detection joint for heat exchanger micro-diameter thin-walled tubes according to claim 1, characterized in that: the diameter of the stepped cylinder of the primary joint (1) is respectively and , the outer diameter of the external thread is , pitch 1.5mm; the center is a diameter of The through hole of the large diameter outer cylindrical end surface has a conical surface with an angle of 37°. 3. A high-pressure gas detection joint for heat exchanger micro-diameter thin-walled tubes according to claim 1, characterized in that: the outer diameter and inner diameter of the shunt pipe (2) are respectively and , with a through holes on the other side with ten through holes. 4. A high-pressure gas detection joint for micro-diameter thin-walled tubes of heat exchangers according to claim 1, characterized in that: the plugs (3) are stepped cylinders with diameters of and , the step height is 10mm. 5. A high-pressure gas detection joint for micro-diameter thin-walled tubes of heat exchangers according to claim 1, characterized in that: the diameters of the stepped cylinders of the secondary joint (4) are respectively and , the outer diameter of the external thread is , pitch 1.5mm; the center is a diameter of The through hole of the large diameter outer cylindrical end surface has a conical surface with an angle of 30°. 6. A high-pressure gas detection joint for micro-diameter thin-walled tubes of heat exchangers according to claim 1, characterized in that: the outer wall of the secondary joint nut (5) is a regular hexagon of M18, with a total length of 20mm ;The internal thread diameter on one end face is , pitch 1.5mm, thread length 15mm; there is a through holes. 7. A high-pressure gas detection joint for micro-diameter thin-walled tubes of heat exchangers according to claim 1, characterized in that: the diameter of the central through hole of the sealing joint (6) is , the two ends are sealing conical surfaces with an angle of 30°, and the middle is the diameter cylinder.