CN110925499A - High-strength small-caliber seamless stainless steel pipe - Google Patents
High-strength small-caliber seamless stainless steel pipe Download PDFInfo
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- CN110925499A CN110925499A CN201911084405.7A CN201911084405A CN110925499A CN 110925499 A CN110925499 A CN 110925499A CN 201911084405 A CN201911084405 A CN 201911084405A CN 110925499 A CN110925499 A CN 110925499A
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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
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
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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
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
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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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/04—Protection of pipes or objects of similar shape against external or internal damage or wear against fire or other external sources of extreme heat
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention relates to the technical field of stainless steel pipes, in particular to a high-strength small-caliber seamless stainless steel pipe which comprises an outer pipe, wherein an inner pipe assembly is arranged inside the outer pipe, the inner pipe assembly comprises an inner pipe, buffer rings which are distributed in an equidistant structure are welded on the outer wall of the inner pipe, the buffer rings are in an equihexagonal structure, support legs which are distributed in an equidistant annular structure are arranged on the outer wall of the inner pipe, which is close to the space between the buffer rings, the support legs are in a trapezoidal structure, the inner pipe comprises a shell, partition plates which are distributed in an equidistant annular structure are welded on the inner wall of the shell, and a reinforcing assembly is fixedly connected. The stainless steel pipe has the beneficial effects that the steel pipe is not easy to deform and bend, the cost is lower, the structure is simple, the wide popularization is easy, the corrosion resistance and the wear resistance of the stainless steel pipe are greatly improved, the flexibility of the fire-resistant layer is good, the high-temperature resistance is good, the impact force generated by shaking or shaking of the pipe body is eliminated, and the pipe body is protected.
Description
Technical Field
The invention relates to the technical field of stainless steel pipes, in particular to a high-strength small-caliber seamless stainless steel pipe.
Background
Seamless stainless steel tubes are referred to as seamless tubes for short. The seamless stainless steel tube has rough surface and no fixed length; seamless stainless steel tubes are used for: boiler, central air conditioning, steel construction, machining, pipeline gas, fire control, etc.
Chinese patent No. CN100501213C discloses a stainless steel, aluminum composite pipe made of stainless steel pipe and aluminum pipe, which is characterized in that the pipe wall of the stainless steel, aluminum composite pipe made of seamless stainless steel pipe and seamless aluminum pipe is two or three layers, wherein the two layers are structured as an outer layer of seamless stainless steel pipe layer, an inner layer of seamless aluminum pipe layer, or an outer layer of seamless aluminum pipe layer, and an inner layer of seamless stainless steel pipe layer; the three layers are structured in such a way that the outer layer and the inner layer are seamless stainless steel pipe layers, the middle layer is a seamless aluminum pipe layer, or the outer layer and the inner layer are seamless aluminum pipe layers, and the middle layer is a seamless steel pipe layer.
However, a stainless steel and aluminum composite pipe has a too simple structure, so that the stainless steel pipe is low in strength, easy to deform and break, and prone to generate vibration or shake under the action of turbulence, bubbles and the like in the fluid conveying process, and is poor in corrosion resistance, low in strength, short in service life and not beneficial to wide popularization.
Disclosure of Invention
The invention aims to provide a high-strength small-caliber seamless stainless steel pipe, which solves the problems that the structure is too simple, the strength is low, the stainless steel pipe is easy to deform and break, the stainless steel pipe can frequently generate vibration or shake under the action of turbulence, bubbles and the like in the fluid conveying process, the corrosion resistance is poor, the strength is low, and the service life is short in the background technology.
The technical scheme of the invention is as follows: the utility model provides a seamless nonrust steel pipe of high strength small-bore, includes the outer tube, the inside of outer tube is provided with the inner tube subassembly, the inner tube subassembly includes the inner tube, the welding has the buffering ring that is equidistant structural distribution on the outer wall of inner tube, and the buffering ring is hexagon structure such as, the inner tube is close to be provided with the stabilizer blade that the equidistance is annular structural distribution on the outer wall between the buffering ring, and the stabilizer blade is the trapezium structure, the inner tube includes the shell, the welding has the baffle that the equidistance is annular structural distribution on the inner wall of shell, and the baffle keeps away from the other end fixedly connected with of shell and strengthens the subassembly, be provided with the polyurethane foam that the equidistance is.
Furthermore, a composite material group is arranged on the inner wall of the reinforcing assembly, a seamless pipe body is arranged on the inner wall of the composite material group, and a fire-resistant layer is arranged on the inner wall of the seamless pipe body.
Furthermore, the reinforcing assembly comprises a glass steel tube, the inner wall of the glass steel tube is provided with lugs distributed in an annular structure at equal intervals, the lugs are in an arc structure, and a groove is formed in the position, close to the space between the lugs, of the glass steel tube.
Further, the composite material group comprises a ceramic glaze pipe, arc-shaped blocks distributed in an annular structure at equal intervals are arranged on the outer wall of the ceramic glaze pipe, and trapezoidal grooves distributed in an annular structure at equal intervals are formed in the inner wall of the ceramic glaze pipe.
Furthermore, the ceramic glaze pipe is inserted in the glass steel pipe, the arc-shaped block is clamped in the groove, and the ceramic glaze pipe, the glass steel pipe and the inner pipe are compounded into a whole.
Furthermore, the seamless pipe body is inserted into the ceramic glaze pipe, the seamless pipe body, the ceramic glaze pipe and the inner pipe are compounded into a whole, the ceramic glaze pipe is formed by overlapping ceramic glaze surfaces, and the thickness of the composite material group is 2mm-3 mm.
Furthermore, the fire-resistant layer comprises a Fenic acid resin coating, an inorganic light fiber layer, an organic light fiber layer, a fire-resistant clay layer and a liquid adhesive in sequence from outside to inside, and the thickness of the Fenic acid resin coating, the thickness of the inorganic light fiber layer, the thickness of the organic light fiber layer, the thickness of the fire-resistant clay layer and the thickness of the liquid adhesive are equal.
Furthermore, the partition plates are uniformly distributed on the outer wall of the glass steel tube along the axial direction, and the partition plates are made of spring steel partition plates.
Further, the volume of the polyurethane foam filled between the partition boards is the same, and the distance between the adjacent partition boards is 3-5 cm.
Furthermore, the buffer ring is fixedly connected with the support leg and the shell, the height of the buffer ring is consistent with that of the support leg, and the outer tube is fixedly connected with the buffer ring and the support leg.
The invention provides a high-strength small-caliber seamless stainless steel tube through improvement, and compared with the prior art, the invention has the following improvements and advantages:
(1) through the enhancement subassembly that sets up, the enhancement layer comprises glass steel pipe, baffle and polyurethane foam, and it has improved nonrust steel pipe's intensity greatly to add it in the enhancement layer of this structure for steel pipe non-deformable is difficult for bending, and its cost is lower, simple structure, easily extensively promotes.
(2) Through the combined material group who sets up, simple structure has corrosion-resistant, intensity height, high temperature resistant, long service life's advantage, and the compound protective coating adhesion that adopts is strong, and the surface is hard, nontoxic, waterproof, acid and alkali-resistance, high temperature resistant, improves the corrosion resistance and the wearability of nonrust steel pipe greatly, makes it can be applied to various adverse circumstances, uses more extensively.
(3) Through the flame retardant coating that sets up, the flame retardant coating includes aromatic acid resin coating, inorganic light fibrous layer, organic light fibrous layer, fire clay layer and liquid binder, and the flame retardant coating pliability is good, and high temperature resistance can prolong the holistic life of nonrust steel pipe.
(4) The buffer rings are arranged on the periphery of the inner pipe, the support legs which are arranged in a gear shape are arranged between the buffer rings, and the support legs have certain elasticity and can play a buffer role so as to eliminate impact force generated by vibration or jitter of the pipe body, protect the pipe body and prolong the service life of the seamless stainless steel pipe.
Drawings
The invention is further explained below with reference to the figures and examples:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the inner tube assembly of the present invention;
FIG. 3 is a schematic view of the inner tube construction of the present invention;
FIG. 4 is a schematic structural view of a reinforcement assembly of the present invention;
FIG. 5 is a schematic view of a composite stack configuration of the present invention;
FIG. 6 is a schematic view of the structure of the refractory of the present invention.
Description of reference numerals:
the composite material comprises an outer pipe 1, an inner pipe component 2, a buffer ring 3, a support leg 4, an inner pipe 5, an outer shell 6, a partition plate 7, polyurethane foam 8, a reinforcing component 9, a composite material group 10, a seamless pipe body 11, a fire-resistant layer 12, a phenolic resin coating 13, an inorganic light fiber layer 14, an organic light fiber layer 15, a fire-resistant clay layer 16, a liquid adhesive 17, a glass steel pipe 18, a bump 19, a groove 20, a ceramic glaze pipe 21, an arc-shaped block 22 and a trapezoid groove 23.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 6, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a high-strength small-caliber seamless stainless steel pipe through improvement, as shown in figures 1-6, the high-strength small-caliber seamless stainless steel pipe comprises an outer pipe 1, an inner pipe assembly 2 is arranged in the outer pipe 1, the inner pipe assembly 2 comprises an inner pipe 5, buffer rings 3 which are distributed in an equidistant structure are welded on the outer wall of the inner pipe 5, the buffer rings 3 are in an equihexagonal structure, support legs 4 which are distributed in an equidistant annular structure are arranged on the outer wall of the inner pipe 5, which is close to the space between the buffer rings 3, the support legs 4 are in a trapezoidal structure, the inner pipe 5 comprises an outer shell 6, partition plates 7 which are distributed in an equidistant annular structure are welded on the inner wall of the outer shell 6, a reinforcing assembly 9 is fixedly connected to the other end of each partition plate 7, polyurethane foams 8 which are distributed in an equidistant annular structure are arranged between the partition plates 7, the polyurethane foams, the supporting legs 4 have certain elasticity and can play a role in buffering so as to eliminate impact force generated by vibration or jitter of the pipe body, protect the pipe body and prolong the service life of the seamless stainless steel pipe.
Further, a composite material group 10 is arranged on the inner wall of the reinforcing assembly 9, a seamless pipe body 11 is arranged on the inner wall of the composite material group 10, and a fire-resistant layer 12 is arranged on the inner wall of the seamless pipe body 11.
Furthermore, the reinforcing assembly 9 includes a glass fiber reinforced plastic tube 18, the inner wall of the glass fiber reinforced plastic tube 18 is provided with protrusions 19 distributed in an annular structure at equal intervals, the protrusions 19 are in an arc structure, and a groove 20 is formed at a position of the glass fiber reinforced plastic tube 18 close to the space between the protrusions 19.
Further, composite material group 10 includes ceramic glaze pipe 21, be provided with the equidistance on the outer wall of ceramic glaze pipe 21 and be the arc piece 22 that the loop configuration distributes, and set up the equidistance on the inner wall of ceramic glaze pipe 21 and be the dovetail groove 23 that the loop configuration distributes, composite material group 10's setting comprises ceramic glaze pipe 21, arc piece 22 and dovetail groove 23, the composite protective coating adhesion that adopts is strong, the surface is hard, nontoxic, waterproof, acid and alkali-resistance, high temperature resistant, the corrosion resistance and the wearability that improve nonrust steel pipe greatly, make it can be applied to various adverse circumstances, use more extensively.
Further, ceramic glaze pipe 21 pegs graft in glass steel pipe 18's inside, and arc piece 22 joint is in the inside of recess 20, and ceramic glaze pipe 21, glass steel pipe 18 and inner tube 5 are compound as an organic whole, and compound formula structure as an organic whole as between ceramic glaze pipe 21 and the glass steel pipe 18 can effectively strengthen the firmness of inner tube 5, has prolonged the life of inner tube 5, has promoted seamless stainless steel pipe's market competition.
Furthermore, the seamless pipe body 11 is inserted into the ceramic glaze pipe 21, the seamless pipe body 11, the ceramic glaze pipe 21 and the inner pipe 5 are compounded into a whole, the ceramic glaze pipe 21 is formed by overlapping 4-6 ceramic glazes, the thickness of the composite material group 10 is 2mm-3mm, and the inner pipe 5 has the advantages of corrosion resistance, high strength, high temperature resistance and long service life due to the addition of the ceramic glazes.
Furthermore, the fire-resistant layer 12 comprises an aromatic acid resin coating 13, an inorganic light fiber layer 14, an organic light fiber layer 15, a fire-resistant clay layer 16 and a liquid adhesive 17 in sequence from outside to inside, the thicknesses of the aromatic acid resin coating 13, the inorganic light fiber layer 14, the organic light fiber layer 15, the fire-resistant clay layer 16 and the liquid adhesive 17 are equal, the fire-resistant layer 12 is arranged, the fire-resistant layer 12 comprises the aromatic acid resin coating 13, the inorganic light fiber layer 14, the organic light fiber layer 15, the fire-resistant clay layer 16 and the liquid adhesive 17, the fire-resistant layer 12 is good in flexibility and high-temperature resistance, and the service life of the whole stainless steel pipe can be prolonged.
Furthermore, the partition plates 7 are uniformly distributed on the outer wall of the glass steel tube 18 along the axial direction, the partition plates 7 are spring steel partition plates, the steel tube is not easy to deform and bend due to the partition plates 7, and the glass steel tube bending machine is low in cost, simple in structure and easy to popularize widely.
Furthermore, the volume of the polyurethane foam 8 filled between the partition plates 7 is the same, the distance between the adjacent partition plates 7 is 3-5cm, and the strength of the stainless steel pipe is greatly improved by adding the partition plates 7 and the polyurethane foam 8.
Further, buffering ring 3 and stabilizer blade 4 are fixed connection with shell 6, and buffering ring 3 and stabilizer blade 4 highly uniform, are fixed connection between outer tube 1 and buffering ring 3 and the stabilizer blade 4, and the collocation between buffering ring 3, stabilizer blade 4 and the outer tube 1 is used, can effectually play fine guard action to inner tube 5 to the life of inner tube 5 has been prolonged, makes inner tube 5 have certain shock resistance absorbing effect simultaneously.
The working principle of the invention is as follows: when in use, the outer tube 1, the buffer rings 3 and the support legs 4 of the high-strength small-caliber seamless stainless steel tube are matched for use, the support legs 4 which are arranged in a gear shape are arranged between the buffer rings 3, the support legs 4 have certain elasticity and can play a buffer role so as to eliminate impact force generated by shaking or dithering of the tube body, protect the tube body and prolong the service life of the seamless stainless steel tube, the reinforcing component 9 arranged inside the inner tube 5 is composed of a glass steel tube 18, a partition plate 7 and polyurethane foam 8, the strength of the stainless steel tube is greatly improved by adding the reinforcing layer of the structure, so that the steel tube is not easy to deform and bend, the cost is lower, the structure is simple, the popularization is easy, meanwhile, the composite material group 10 is composed of a ceramic glaze tube 21, an arc-shaped block 22 and a trapezoid groove 23, and the ceramic glaze of the structure enables the inner tube 5 to have corrosion resistance, The stainless steel pipe has the advantages of high strength, high temperature resistance and long service life, the adopted composite protective coating has strong adhesive force, hard surface, no toxicity, water resistance, acid and alkali resistance and high temperature resistance, the corrosion resistance and the wear resistance of the stainless steel pipe are greatly improved, the stainless steel pipe can be applied to various severe environments, the application is wider, the fire-resistant layer 12 comprises an aromatic acid resin coating 13, an inorganic light fiber layer 14, an organic light fiber layer 15, a fire-resistant clay layer 16 and a liquid binder 17, the fire-resistant layer 12 has good flexibility and high temperature resistance, and the service life of the whole stainless steel pipe can be prolonged.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a seamless stainless steel pipe of small-bore of high strength which characterized in that: comprises an outer pipe (1), an inner pipe component (2) is arranged in the outer pipe (1), the inner pipe component (2) comprises an inner pipe (5), the outer wall of the inner pipe (5) is welded with buffer rings (3) which are distributed in an equidistant structure, the buffer rings (3) are in an equihexagonal structure, the outer wall of the inner pipe (5) close to the space between the buffer rings (3) is provided with support legs (4) which are distributed in an annular structure at equal intervals, the support legs (4) are in a trapezoidal structure, the inner pipe (5) comprises an outer shell (6), the inner wall of the shell (6) is welded with clapboards (7) which are distributed in an annular structure at equal intervals, and the other end of the clapboard (7) far away from the shell (6) is fixedly connected with a strengthening component (9), polyurethane foam (8) which are distributed annularly at equal intervals are arranged between the partition plates (7), and the polyurethane foam (8) is of an arc-shaped structure.
2. The high-strength small-caliber seamless stainless steel tube according to claim 1, wherein: the inner wall of the reinforcing component (9) is provided with a composite material group (10), the inner wall of the composite material group (10) is provided with a seamless pipe body (11), and the inner wall of the seamless pipe body (11) is provided with a fire-resistant layer (12).
3. The high-strength small-caliber seamless stainless steel tube according to claim 1, wherein: the reinforcing assembly (9) comprises a glass steel tube (18), lugs (19) which are distributed in an annular structure at equal intervals are arranged on the inner wall of the glass steel tube (18), the lugs (19) are of an arc-shaped structure, and grooves (20) are formed in the positions, close to the positions between the lugs (19), of the glass steel tube (18).
4. The high-strength small-caliber seamless stainless steel tube according to claim 2, wherein: the composite material group (10) comprises ceramic glaze tubes (21), arc-shaped blocks (22) distributed in an annular structure at equal intervals are arranged on the outer walls of the ceramic glaze tubes (21), and trapezoidal grooves (23) distributed in an annular structure at equal intervals are formed in the inner walls of the ceramic glaze tubes (21).
5. The high-strength small-caliber seamless stainless steel tube according to claim 4, wherein: the ceramic glaze pipe (21) is inserted in the glass steel pipe (18), the arc-shaped blocks (22) are clamped in the grooves (20), and the ceramic glaze pipe (21), the glass steel pipe (18) and the inner pipe (5) are compounded into a whole.
6. The high-strength small-caliber seamless stainless steel tube according to claim 2, wherein: the seamless pipe body (11) is inserted into the ceramic glaze pipe (21), the seamless pipe body (11), the ceramic glaze pipe (21) and the inner pipe (5) are compounded into a whole, the ceramic glaze pipe (21) is formed by overlapping 4-6 ceramic glazes, and the thickness of the composite material group (10) is 2-3 mm.
7. The high-strength small-caliber seamless stainless steel tube according to claim 2, wherein: the fire-resistant layer (12) is sequentially provided with a fen-acid resin coating (13), an inorganic light fiber layer (14), an organic light fiber layer (15), a fire-resistant clay layer (16) and a liquid adhesive (17) from outside to inside, and the thicknesses of the fen-acid resin coating (13), the inorganic light fiber layer (14), the organic light fiber layer (15), the fire-resistant clay layer (16) and the liquid adhesive (17) are equal.
8. The high-strength small-caliber seamless stainless steel tube according to claim 1, wherein: the partition plates (7) are uniformly distributed on the outer wall of the glass steel tube (18) along the axial direction, and the partition plates (7) are made of spring steel partition plates.
9. The high-strength small-caliber seamless stainless steel tube according to claim 1, wherein: the volume of the polyurethane foam (8) filled between the partition boards (7) is the same, and the distance between the adjacent partition boards (7) is 3-5 cm.
10. The high-strength small-caliber seamless stainless steel tube according to claim 1, wherein: buffer ring (3) and stabilizer blade (4) are fixed connection with shell (6), and buffer ring (3) and stabilizer blade (4) highly uniform, be fixed connection between outer tube (1) and buffer ring (3) and stabilizer blade (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911084405.7A CN110925499A (en) | 2019-11-08 | 2019-11-08 | High-strength small-caliber seamless stainless steel pipe |
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| CN201911084405.7A CN110925499A (en) | 2019-11-08 | 2019-11-08 | High-strength small-caliber seamless stainless steel pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114870970A (en) * | 2022-04-14 | 2022-08-09 | 江西理工大学 | Liquid nitrogen freezing pulverizer suitable for biomedical degradable materials |
| CN115628830A (en) * | 2022-11-08 | 2023-01-20 | 山东省地矿工程集团有限公司 | Heat source temperature measuring device for geothermal resource exploration |
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| CN207378314U (en) * | 2017-10-16 | 2018-05-18 | 浙江中尔阀门有限公司 | A kind of compound water heating pipe fittings |
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