CN113531221B - Composite embedded pipe and processing method - Google Patents
Composite embedded pipe and processing method Download PDFInfo
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- CN113531221B CN113531221B CN202010291706.3A CN202010291706A CN113531221B CN 113531221 B CN113531221 B CN 113531221B CN 202010291706 A CN202010291706 A CN 202010291706A CN 113531221 B CN113531221 B CN 113531221B
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- inner core
- pipe
- pressure taking
- outer sleeve
- tube
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
- F16L9/04—Reinforced pipes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/44—Venturi tubes
Abstract
The invention discloses a composite embedded pipe, which comprises an outer pipe and an inner core pipe, wherein the inner core pipe is embedded in the outer pipe, the outer wall of the inner core pipe is attached to the inner wall of the outer pipe, the outer pipe is made of a first metal material, and the inner core pipe is made of a second metal material. The invention has the beneficial effects that: the inner layer and the outer layer of the flow tube are respectively made of materials with different performances and then assembled, so that the service life of the flow tube is prolonged compared with that of the common materials, but the cost is still controllable, and the flow tube has both functionality and economy.
Description
Technical Field
The invention belongs to the field of fluid measurement devices, and particularly relates to a composite sleeve and a processing method.
Background
The pipe body for medium diversion is generally made of a single metal material, and is often faced with the adverse factors of concurrent erosion corrosion and chemical corrosion due to the corrosion components of the internal pressure and the fluid, so that the service life of the pipe body is reduced, and the problem of reduced dimensional accuracy caused by corrosion exists for the pipe body with higher precision. For example, venturi flow sensor bodies for multiphase metering of oilfield oil, gas, and water are typically made of a single metallic material, and the flow is calculated by flowing a liquid through a specially shaped process pipe, creating a pressure differential between the upstream pipe section and the throat due to a change in flow rate, and measuring the differential pressure using a differential pressure gauge. The phase fraction of the medium is measured by combining a gamma sensor at the upstream or throat of the venturi tube, so that the single-phase flow of oil, gas and water under the total flow is distinguished. Special oilfield media usually contain corrosive media such as hydrogen sulfide, carbon dioxide and the like, and a pipe body made of common materials is difficult to achieve the expected service life due to the flowing erosion of the multiphase media and the erosion effect of the corrosive media. The nickel-based alloy material with strong corrosion resistance can meet the service life requirement of the flow measurement sensor under the special oil field working condition, but the manufacturing cost is high. Therefore, it is necessary to develop a venturi flow sensor with a longer life by improving the corrosion resistance of the pipe body at the contact portion with the oilfield medium by the structural design of the flow pipe on the premise of controlling the manufacturing cost.
Disclosure of Invention
Accordingly, one of the objectives of the present invention is to provide a composite sleeve.
The technical scheme is as follows:
the composite embedded sleeve is characterized by comprising an outer sleeve and an inner core pipe, wherein the inner core pipe is embedded in the outer sleeve, and the outer wall of the inner core pipe is attached to the inner wall of the outer sleeve;
the outer sleeve is made of a first metal material, and the inner core tube is made of a second metal material.
By adopting the design, the flow tube has the advantages that the inner layer and the outer layer of the nested tube can be respectively made of materials with different performances and then assembled together, for example, the inner layer is mainly made of materials with medium scouring resistance and corrosion resistance, the outer layer is mainly made of materials with high strength and good weather resistance, and the flow tube formed by compounding the two materials combines the respective advantages.
As a preferable technical scheme, the inner core tube is in interference fit with the outer sleeve.
By adopting the design, the anti-slip device has the advantages of slip prevention, good reliability and convenience in transportation and installation.
As the preferable technical scheme, the inner cavity of the inner core tube is a venturi cavity, the inner core tube is connected with a pressure taking tube, the pressure taking tube penetrates through the tube wall of the outer sleeve, the inner end of the pressure taking tube is connected with the inner core tube, and the lumen of the pressure taking tube is communicated with the venturi cavity.
With the above design, it is advantageous to measure and calculate the flow rate of the venturi chamber 3 by the pressure sensor.
As the preferable technical scheme, a welding jack is arranged on the pipe wall of the outer sleeve, the pressure taking pipe is inserted into the welding jack, and the outer pipe wall of the pressure taking pipe is tightly attached to the inner hole wall of the welding jack.
By adopting the design, the pressure taking pipe has the advantages that after the inner core pipe and the outer sleeve are allowed to be compositely nested, the pressure taking pipe is processed on the inner core pipe.
As a preferable technical scheme, the welding jack comprises a straight hole section and a round table section which are arranged with a hole core line, wherein the inner end of the straight hole section is opened on the inner wall of the outer sleeve, the outer end of the straight hole section is in butt joint with the smaller end of the round table section, and the larger end of the round table section is opened on the outer wall of the outer sleeve;
the outer wall of the pressure taking pipe is adapted to the hole wall of the welding jack.
By adopting the design, the welding jack has the advantages that the outer end of the welding jack is in a round table shape, so that the pressure taking pipe is prevented from sinking inwards, and the welding processing of the pressure taking pipe at the inner end of the welding jack is facilitated.
As a preferable technical scheme, a welding recess is formed in the outer wall of the inner core tube corresponding to the inner end of the pressure taking tube, the inner end of the pressure taking tube is inserted into the welding recess, and the inner end face of the pressure taking tube and the inner core tube are welded into a whole;
the outer wall of the pressure taking pipe is welded with the outer sleeve.
By adopting the design, the pressure taking pipe has the advantage of improving the connection strength between the pressure taking pipe and the inner core pipe.
As the preferable technical scheme, the maximum inner pipe diameter of the pressure taking pipe is D1, and the minimum inner aperture of the welding jack is D2, wherein D2-D1 is more than or equal to 6mm.
By adopting the design, the pressure taking pipe has the advantages that the strength of the pressure taking pipe is ensured, the inner hole wall of the pressure taking pipe is different from the outer sleeve pipe in material, and the corrosion resistance is ensured.
As a preferable technical scheme, the lumen of the pressure taking pipe is a pressure taking hole, the pressure taking hole extends through the pipe wall of the inner core pipe, and the pressure taking hole comprises a small diameter section of the pressure taking hole, a circular table section of the pressure taking hole and a large diameter section of the pressure taking hole which are sequentially connected from inside to outside;
the two pressure taking pipes are respectively an inlet pressure taking pipe and a throat pressure taking pipe;
the venturi cavity comprises an upstream straight pipe section, a converging section, a throat section and a diverging section which are sequentially connected in the same direction, wherein the outer end of the upstream straight pipe section forms an inlet of the venturi, the outer end of the diverging section forms an outlet of the venturi, an inlet pressure taking pipe is connected to the inlet of the inner core pipe, and the throat section is connected with the throat pressure taking pipe.
By adopting the design, the pressure measuring device has the advantages that the shape of the pressure measuring hole is suitable for installing a pressure sensor, and the pressure is detected at the inlet and the throat section of the venturi cavity respectively, so that the flow is calculated.
As a preferable technical scheme, two ends of the outer sleeve and the inner core pipe are respectively covered with a butt joint ring, the inner edge of the butt joint ring is in seal welding with the corresponding end face of the inner core pipe, and the outer edge of the butt joint ring is in seal welding with the corresponding end face of the outer sleeve.
By adopting the design, the inner and outer sections of the flow tube are sealed by the butt joint rings, and the sealing end surface for butt joint with the pipeline is also covered by the corrosion resistant material.
The second object of the present invention is to provide a method for manufacturing a composite sleeve.
The processing method of the flow tube is characterized by comprising the following steps:
step one, pipe fitting processing: the inner core tube and the outer sleeve are respectively processed, the diameter of the outer wall of the inner core tube and the diameter of the inner hole of the outer sleeve are processed according to a preset interference magnitude, the diameter of the outer wall of the inner core tube is larger than the diameter of the inner hole of the outer sleeve, and at least one step of the second step or the third step is carried out to nest;
step two, hot nesting: heating the outer sleeve, wherein the inner hole of the outer sleeve is enlarged after the outer sleeve is heated and swelled until the inner hole diameter is larger than or equal to the outer diameter of the inner core pipe, and then embedding the inner core pipe into the preset position in the outer sleeve; then cooling to room temperature, wherein the inner hole size of the outer sleeve is reduced after the outer sleeve is subjected to the cooling action, so that the inner core tube is tightly held, interference fit is formed between the inner core tube and the outer sleeve, and coating stress is generated, so that a sleeve is embedded;
step three, cold nesting: cooling the inner core tube to reduce the outer wall size of the inner core tube after cold shrinkage until the outer diameter of the inner core tube is smaller than or equal to the inner hole diameter of the outer sleeve, embedding the inner core tube into the preset position in the outer sleeve, and then recovering to room temperature, wherein the outer wall size of the inner core tube is enlarged after the inner core tube is subjected to thermal expansion, so that the inner core tube is held tightly by the outer sleeve, and interference fit is formed between the inner core tube and the outer sleeve to generate cladding stress so as to form an embedded sleeve;
step four, processing the welding jack on the outer sleeve, and processing the welding recess on the inner core tube: processing a blind hole on the wall of the embedded pipe along the radial direction, wherein the inner end of the blind hole reaches the outer wall of the inner core pipe to form the welding jack, and continuously processing the welding recess inwards on the outer wall of the inner core pipe along the blind hole;
step five, plug welding and pressure taking column: filling welding materials in the welding concave and the welding jack by plug welding by using the same or similar materials as the inner core pipe so as to form the pressure taking column;
step six, processing the pressure taking pipe: processing a through hole along the axial direction of the pressure taking column, wherein the inner end of the through hole is communicated with the inner cavity of the inner core pipe to form the pressure taking pipe;
step seven, processing a flange ring: and processing the flange ring on the outer wall of the outer sleeve.
By adopting the method, the process is simple, and the composite sleeve pipe made of materials with different service performances is successfully realized.
In the first step, the inner diameter of the outer sleeve pipe is A at normal temperature, the interference x is designed, x is greater than 0, the outer diameter of the inner core pipe is A+x, so that the bearing capacity of the inner core pipe is improved, and the bearing capacity of the inner cavity of the inner core pipe is regulated by regulating the interference x.
By adopting the method, the pressure bearing capacity of the pressure-resistant device, namely the flow tube, is improved.
Compared with the prior art, the invention has the beneficial effects that: the inner layer and the outer layer of the nested pipe are respectively made of materials with different performances and then assembled, so that the respective excellent performances of the two materials are combined, the service life is prolonged compared with that of the common materials, the cost is still controllable, and the nested pipe has both functionality and economy.
Drawings
FIG. 1 is a schematic structural view of a composite sleeve;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is an enlarged view of section m1 of FIG. 3, showing the interface being convex (RF);
FIG. 5 is a schematic view of another docking ring from the perspective of FIG. 4, wherein the docking surface of the docking ring is a ring connection surface (RTJ);
FIG. 6 is an enlarged view of m2 of FIG. 3;
FIG. 7 is a schematic view of an exploded construction of the inner core tube and outer sleeve;
FIG. 8 is a schematic view of the structure of a nested tube;
FIG. 9 is a schematic view of the structure after a welding receptacle is machined into the nested tube;
fig. 10 is a schematic diagram of the structure after plug welding based on fig. 9.
Detailed Description
The invention is further described below with reference to examples and figures.
Example 1
As shown in fig. 1 to 3, a composite sleeve comprises a sleeve, the sleeve comprises an outer sleeve 1 and an inner core tube 2, the inner core tube 2 is embedded in the outer sleeve 1, the outer wall of the inner core tube 2 is attached to the inner wall of the outer sleeve 1, and the inner cavity of the inner core tube 2 is a venturi cavity 3. The venturi cavity 3 comprises an upstream straight pipe section 3a, a converging section 3b, a throat section 3c and a diverging section 3d which are sequentially connected in the same direction, wherein the outer end of the upstream straight pipe section 3a forms an inlet of the venturi cavity 3, and the outer end of the diverging section 3d forms an outlet of the venturi cavity 3. The inner core pipe 2 is in interference fit with the outer sleeve 1.
The inner core pipe 2 is connected with a pressure taking pipe for installing a pressure measuring sensor, the pressure taking pipe penetrates through the pipe wall of the outer sleeve 1, the outer wall of the pressure taking pipe is connected with the outer sleeve 1 in a welded mode, the inner end of the pressure taking pipe is welded with the inner core pipe 2 into a whole, and the pressure taking pipe is communicated with the pipe cavity of the inner core pipe 2.
As shown in fig. 6, the lumen of the pressure taking tube is a pressure taking hole, the pressure taking hole extends through the wall of the inner core tube 2, and the pressure taking hole comprises a small diameter section, a circular table section and a large diameter section of the pressure taking hole, which are sequentially connected from inside to outside. The pressure taking hole small-diameter section is used for drainage, the pressure taking hole large-diameter section is used for inserting a pressure sensor, and the pressure taking hole circular table section is used as a sealing end face between the pressure sensor and the pressure taking hole. The aperture of the small-diameter section of the pressure taking hole is 1-1.5mm, and the axial length is 2-5mm.
The two pressure taking pipes are respectively an inlet pressure taking pipe 5 and a throat pressure taking pipe 6, the inlet of the inner core pipe 2 is connected with the inlet pressure taking pipe 5, and the throat section 3c is connected with the throat pressure taking pipe 6.
The two end surfaces of the outer sleeve 1 and the inner core tube 2 are respectively covered with a butt joint ring 4, the inner edge of the butt joint ring 4 is in sealing connection with the corresponding end surface of the inner core tube 2, and the outer edge of the butt joint ring 4 is in sealing connection with the corresponding end surface of the outer sleeve 1. Specifically, the butt joint ring 4 and the pressure taking pipe are respectively welded with the outer sleeve 1 and the inner core pipe 2.
The outer walls of the two ends of the outer sleeve 1 are respectively integrally formed with flange rings 1a. The outer end surface of the butt ring 4 is higher than the outer end surface of the flange ring 1a to form a flange butt surface. The flange interface is convex (RF) as shown in fig. 4 or ring interface (RTJ) as shown in fig. 5.
The inner core pipe 2, the outer sleeve pipe 1, the butt joint ring 4 and the pressure taking pipe are all made of alloy materials, wherein the inner core pipe 2, the butt joint ring 4 and the pressure taking pipe are made of materials which are stronger than those of the outer sleeve pipe 1, so that the corrosion resistance and the scouring resistance of the Venturi pipe in an oilfield environment are improved, and the outer sleeve pipe 1 is good in high strength and weather resistance. For example, the inner core tube 2 and the docking collar 4 may use a corrosion resistant alloy material such as nickel based alloy, and the outer sleeve 1 is made of a low cost steel material such as stainless steel, carbon steel, etc. In a specific embodiment, the inner core tube 2 is made of a B564N 06625 Alloy, the butt joint ring 4 and the pressure taking tube are made of an Alloy 625 Alloy, and the outer sleeve 1 is made of an a 182F 316 Alloy.
The pressure measuring sensor can use a gamma sensor to distinguish the flow of each phase of oil, gas and water.
Because all surfaces contacted with the flowing medium are made of corrosion resistant materials, the service life of the manufactured flowmeter tube is greatly prolonged compared with that of a venturi flowmeter tube made of common materials.
Example two
The processing method of the flowmeter tube comprises the following steps:
step one, pipe fitting processing: respectively processing the inner core tube 2 and the outer sleeve 1, wherein the inner core tube 2 is provided with an outer circular surface, the outer sleeve 1 is provided with an inner circular surface, the designed interference x is x >0, the inner diameter of the outer sleeve 1 is A at normal temperature, and the outer diameter of the inner core tube 2 is A+x, as shown in figure 7;
step two, hot nesting: heating the outer sleeve 1 or cooling the inner core tube 2 or both by utilizing the principle of thermal expansion and cold contraction of materials, so that the temperature of the inner core tube 2 is lower than that of the outer sleeve 1, and the outer diameter of the inner core tube 2 is smaller than or equal to the inner diameter of the outer sleeve 1, under the condition, the inner core tube 2 is quickly embedded into the outer sleeve 1, and after the inner core tube is restored to normal temperature, the outer sleeve 1 generates cladding stress on the inner core tube 2, and the inner core tube 2 and the outer core tube form interference fit to form an embedded tube, wherein the embedded tube is a blank for subsequent processing as shown in fig. 8;
step three, processing the welding jack 1b: machining a blind hole in the wall of the sleeve in the radial direction, the inner end of the blind hole reaching at least the outer wall of the inner core tube 2 to form the welding insertion hole 1b, as shown in fig. 9;
the size and shape of the blind holes can firstly meet the implementation of a build-up welding process, so that operators can conveniently finish the process from the contact point of the inner core tube 2 to the surface of the outer sleeve 1Performing surfacing process operation; and, should if the maximum inner pipe diameter of the pressure taking pipe is D 1 The minimum inner aperture of the welding jack 1b is D 2 Then must satisfy D 2 -D 1 ≥6mm；
The welding jack 1b comprises a straight hole section 1b1 and a round platform section 1b2 which are arranged on the same hole core line, the inner end of the straight hole section 1b1 is opened on the inner wall of the outer sleeve 1, the outer end of the straight hole section 1b1 is in butt joint with the smaller end of the round platform section 1b2, and the larger end of the round platform section 1b2 is opened on the outer wall of the outer sleeve 1;
in order to improve the plug welding effect of the fourth step, 2mm deep welding pits are processed on the outer surface of the inner core pipe 2 so as to form the inner ends of the blind holes;
step four, plug welding a pressure taking column 2a: filling the welding insertion hole 1b with a welding material using the same or similar material as the inner core tube 2 to form the pressure-tapping column 2a, as shown in fig. 10;
step five, processing the pressure taking pipe 5: processing a through hole along the axial direction of the pressure taking column 2a, wherein the inner end of the through hole is communicated with the inner cavity of the inner core tube 2 to form the pressure taking tube;
step six, overlaying the butt joint ring 4: build-up welding is carried out on two ends of the embedded pipe respectively by using the same or similar materials as the inner core pipe 2, and the contact interface between the inner core pipe 2 and the end part of the outer sleeve 1 is covered, so as to form the butt joint ring 4;
before overlaying, machining the end part of the nested pipe in advance according to the design of the butt joint ring 4 to obtain a proper end surface shape convenient for butt joint, then centering overlaying on the end surface, and carrying out proper machining according to requirements after welding is finished;
step seven, processing the flange ring 1a: machining the outer wall of the outer sleeve 1 to form the flange rings 1a at two ends of the outer sleeve;
according to the requirement, screw holes distributed in the circumferential direction or bolt holes distributed in the circumferential direction are machined in the flange ring 1a, and finally the product shown in figure 1 is obtained.
According to the invention, the technical scheme of the hot nested composite inner core is adopted, so that the material of the liquid passing part of the inner core of the sensor is more corrosion-resistant and scouring-resistant, and the service life problem of the sensor is solved within an acceptable cost range, and the sensor has a good application prospect; in addition, the outer sleeve is in interference fit to generate cladding stress on the inner core pipe, so that the capacity of the inner core pipe for bearing the inner pressure of the inner core pipe is improved, and the improvement of the capacity of bearing the inner pressure can be changed by changing the surplus.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A composite sleeve, characterized in that: the inner core pipe (2) is embedded in the outer sleeve (1), and the outer wall of the inner core pipe (2) is attached to the inner wall of the outer sleeve (1);
the outer sleeve (1) is made of a first metal material, and the inner core tube (2) is made of a second metal material;
the inner core tube (2) is in interference fit with the outer sleeve (1);
the inner cavity of the inner core tube (2) is a venturi cavity (3), the inner core tube (2) is connected with a pressure taking tube, the pressure taking tube penetrates through the tube wall of the outer sleeve (1), the inner end of the pressure taking tube is connected with the inner core tube (2), and the lumen of the pressure taking tube is communicated with the venturi cavity (3);
two ends of the outer sleeve (1) and the inner core tube (2) are respectively covered with a butt joint ring (4), the inner edge of the butt joint ring (4) is in seal welding with the corresponding end face of the inner core tube (2), and the outer edge of the butt joint ring (4) is in seal welding with the corresponding end face of the outer sleeve (1);
the second metal material is stronger in corrosion resistance than the first metal material, the second metal material is an alloy material, the outer sleeve (1) is made of low-cost steel, and the pressure taking pipe, the inner core pipe (2) and the butt joint ring (4) are made of corrosion resistant alloy materials;
the outer wall of the inner core pipe (2) is provided with a welding recess corresponding to the inner end of the pressure taking pipe, the inner end of the pressure taking pipe is inserted into the welding recess, and the inner end face of the pressure taking pipe and the inner core pipe (2) are welded into a whole;
the outer wall of the pressure taking pipe is welded with the outer sleeve (1);
a welding jack (1 b) is arranged on the pipe wall of the outer sleeve (1), the pressure taking pipe is inserted into the welding jack (1 b), and the outer pipe wall of the pressure taking pipe is tightly adhered to the inner hole wall of the welding jack (1 b);
the welding jack (1 b) comprises a straight hole section (1 b 1) and a round platform section (1 b 2) which are arranged on the same hole core line, the inner end of the straight hole section (1 b 1) is opened on the inner wall of the outer sleeve (1), the outer end of the straight hole section (1 b 1) is in butt joint with the smaller end of the round platform section (1 b 2), and the larger end of the round platform section (1 b 2) is opened on the outer wall of the outer sleeve (1);
the outer wall of the pressure taking pipe is matched with the hole wall of the welding jack (1 b);
the forming method of the pressure taking pipe comprises the following steps: filling welding materials into the welding recess and the welding jack (1 b) by plug welding by using the same or similar materials as the inner core tube (2) to form a pressure taking column (2 a);
machining a through hole along the axial direction of the pressure taking column (2 a), wherein the inner end of the through hole is communicated with the inner cavity of the inner core tube (2) to form the pressure taking tube;
the lumen of the pressure taking pipe is a pressure taking hole, the pressure taking hole extends through the pipe wall of the inner core pipe (2), and the pressure taking hole comprises a pressure taking hole small-diameter section, a pressure taking hole circular table section and a pressure taking hole large-diameter section which are sequentially connected from inside to outside;
the two pressure taking pipes are respectively an inlet pressure taking pipe (5) and a throat pressure taking pipe (6);
the venturi tube cavity (3) comprises an upstream straight tube section (3 a), a gradually-reduced section (3 b), a throat section (3 c) and a gradually-expanded section (3 d) which are sequentially connected in the same direction, wherein the outer end of the upstream straight tube section (3 a) forms an inlet of the venturi tube cavity (3), the outer end of the gradually-expanded section (3 d) forms an outlet of the venturi tube cavity (3), an inlet of the inner core tube (2) is connected with an inlet pressure taking tube (5), and the throat section (3 c) is connected with a throat pressure taking tube (6).
2. A method of manufacturing a nested tube according to claim 1, comprising the steps of:
step one, pipe fitting processing: respectively processing the inner core tube (2) and the outer sleeve (1), processing the outer wall diameter of the inner core tube (2) and the inner hole diameter of the outer sleeve (1) according to a preset interference, wherein the outer wall diameter of the inner core tube (2) is larger than the inner hole diameter of the outer sleeve (1), and then performing at least one step of the second step or the third step to nest;
step two, hot nesting: heating the outer sleeve (1), wherein the inner hole of the outer sleeve (1) is enlarged after being heated and expanded until the inner hole diameter of the outer sleeve is larger than or equal to the outer diameter of the inner core pipe (2), and then embedding the inner core pipe (2) into a preset position in the outer sleeve (1); then cooling to room temperature, wherein the inner hole size of the outer sleeve (1) is reduced after the outer sleeve is subjected to a cooling effect, so that the inner core tube (2) is tightly held, interference fit is formed between the inner core tube and the outer sleeve, and coating stress is generated, so that a sleeve is embedded;
step three, cold nesting: cooling the inner core tube (2), so that the outer wall size of the inner core tube (2) is reduced after cold shrinkage until the outer diameter of the inner core tube is smaller than or equal to the inner hole diameter of the outer sleeve (1), embedding the inner core tube (2) into a preset position in the outer sleeve (1), and then recovering to room temperature, wherein the outer diameter size of the inner core tube (2) is increased after the inner core tube (2) is heated and expanded, and then the inner core tube is held tightly by the outer sleeve (1), so that interference fit is formed between the inner core tube and the outer sleeve, and cladding stress is generated, so that an embedded pipe is formed;
step four, processing the welding jack (1 b) on the outer sleeve (1), and processing the welding recess on the inner core tube (2): machining a blind hole in the wall of the sleeve in the radial direction, wherein the inner end of the blind hole reaches the outer wall of the inner core pipe (2) to form the welding jack (1 b), and continuously inwards machining the welding recess in the outer wall of the inner core pipe (2) along the blind hole;
step five, plug welding a pressure taking column (2 a): filling welding materials in the welding recess and the welding jack (1 b) by plug welding by using the same or similar materials as the inner core tube (2) to form the pressure taking column (2 a);
step six, processing the pressure taking pipe: machining a through hole along the axial direction of the pressure taking column (2 a), wherein the inner end of the through hole is communicated with the inner cavity of the inner core tube (2) to form the pressure taking tube;
step seven, processing a flange ring (1 a): the flange ring (1 a) is processed on the outer wall of the outer sleeve (1).
3. The processing method according to claim 2, characterized in that: in the first step, the inner diameter of the outer sleeve (1) is A at normal temperature, the interference x is designed, x is greater than 0, the outer diameter of the inner core tube (2) is A+x, so that the bearing capacity of the inner core tube (2) is improved, and the bearing capacity of the inner cavity of the inner core tube (2) is regulated by regulating the interference x.
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