High-pressure-resistant and low-temperature-resistant seamless steel tube

Abstract

The utility model discloses a high-pressure and low-temperature resistant seamless steel pipe which comprises an outer steel pipe main body, an inner steel pipe main body arranged in the outer steel pipe main body, a supporting layer arranged between the outer steel pipe main body and the inner steel pipe main body and used for increasing supporting strength, and a connecting mechanism connected with the end of the outer steel pipe main body. A supporting layer is arranged between the outer steel pipe body and the inner steel pipe body, a first cushion layer used for achieving connection is further arranged between the supporting layer and the outer steel pipe body, and a second cushion layer used for achieving connection is further arranged between the supporting layer and the inner steel pipe body. By arranging the first cushion layer and the second cushion layer, the force of the seamless steel pipe is conveniently dispersed, the supporting stability is improved by arranging the supporting layer of the hexagonal steel pipe structure, and by connecting the parallel face of the hexagonal steel pipe with the first cushion layer or the second cushion layer, the force borne by the outer steel pipe body and the force borne by the inner steel pipe body are conveniently transmitted to each other.

Description

Technical Field

[0001] The utility model belongs to the technical field of seamless steel pipes, and in particular relates to a high-pressure and low-temperature resistant seamless steel pipe. Background Art

[0002] Seamless steel pipe is made of a whole round steel through holes. There is no weld on the surface of the steel pipe, which is called seamless steel pipe. According to the production method, seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, jacking pipe, etc. According to the cross-sectional shape, seamless steel pipe is divided into round and special-shaped. Special-shaped pipes have square, oval, triangle, hexagon, melon seed, star, winged pipe and many other complex shapes. The maximum diameter is 900mm and the minimum diameter is 4mm. According to different uses, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemicals, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.

[0003] Most of the seamless steel pipes in the prior art are single-layer pipe structures, which have poor pressure resistance. In order to improve the pressure resistance of seamless steel pipes in the prior art, most of them are improved by adding telescopic structures such as springs inside the steel pipes to provide the pressure resistance of seamless steel pipes. However, the existing seamless steel pipes will solidify at low temperatures when using transmission water, increase the volume inside the steel pipe, and cause the steel pipe to deform. Therefore, changes are needed. Utility Model Content

[0004] The utility model aims to provide a high-pressure and low-temperature resistant seamless steel pipe, so as to solve the technical problem that most seamless steel pipes in the prior art are single-layer pipe structures with poor pressure resistance.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model provides a high-pressure and low-temperature resistant seamless steel pipe, comprising an outer steel pipe body, an inner steel pipe body arranged inside the outer steel pipe body, a support layer arranged between the outer steel pipe body and the inner steel pipe body for increasing the support strength, and a connecting mechanism connected to the end of the outer steel pipe body;

[0007] A first cushion layer for achieving connection is also provided between the support layer and the outer steel pipe body, and a second cushion layer for achieving connection is also provided between the support layer and the inner steel pipe body.

[0008] By arranging a support layer between the outer steel pipe body and the inner steel pipe body, the bidirectional support strength of the outer and inner sides of the seamless steel pipe is increased. By arranging the first cushion layer and the second cushion layer on both sides of the inner steel pipe body, the connection setting of the inner steel pipe body is facilitated and the force dispersion of the inner steel pipe body is facilitated.

[0009] Optionally, the support layer is configured as a ring-shaped connection structure of several regular hexagonal steel pipes, and each pair of parallel surfaces of the several hexagonal steel pipes is connected to the first cushion layer or the second cushion layer. The stability of the support is improved by configuring a support layer of a hexagonal steel pipe structure, and the parallel surfaces of the hexagonal steel pipes are connected to the first cushion layer or the second cushion layer to facilitate the transfer of the force borne by the outer steel pipe body and the inner steel pipe body to each other.

[0010] Optionally, the first cushion layer and the second cushion layer include at least one rubber layer and any one of a polytetrafluoroethylene layer and a nylon layer. The first cushion layer and the second cushion layer are each provided with two layers, and each layer includes a rubber layer to realize an elastically compressed space, and one of a polytetrafluoroethylene layer and a nylon layer is provided to improve the pressure resistance and low temperature resistance.

[0011] Optionally, an annular clamping groove is provided at the end of the inner steel pipe body, and the clamping groove of the inner steel pipe body is provided with an abutment groove for clamping with the connecting structure.

[0012] Optionally, the connecting mechanism includes a connecting tube, the connecting tube is provided with a hole adapted to the inner diameter of the inner steel pipe body, and the connecting tube is fixedly provided with a connecting outer tube, the connecting outer tube is threadedly connected to a connecting inner tube, and the connecting inner tube is provided with a structure with a gradually expanding outer diameter from the inside of the inner steel pipe body to the outside, and a threaded structure is provided on the outer wall of the connecting inner tube to be connected to the connecting outer tube, and the connecting inner tube and the connecting outer tube are threadedly connected to each other so that the connecting outer tube can be driven to rotate by rotating the connecting tube, and the connecting outer tube moves on the connecting inner tube under the action of the threaded structure to expose connecting inner tubes of different outer diameters, so that the connecting mechanism can be connected to inner steel pipe bodies of different inner diameters.

[0013] Optionally, a clamping block adapted to the abutment groove is provided at the end of the connecting inner cylinder, and the clamping block is adapted to the abutment groove to facilitate the connection cylinder to be rotated after the clamping block is clamped to the abutment groove;

[0014] The end of the connecting outer tube is clamped with the outer wall of the outer steel pipe body, and the end of the connecting outer tube is also provided with a connecting ring, the connecting ring is provided with a sealing gasket, and the outer steel pipe body is sleeved with a connecting flange connected to the connecting ring by connecting bolts.

[0015] Beneficial effects and advantages of the utility model:

[0016] The high-pressure and low-temperature resistant seamless steel pipe increases the bidirectional support strength on the outer and inner sides of the seamless steel pipe by arranging a support layer between the outer steel pipe body and the inner steel pipe body, facilitates the connection and setting of the inner steel pipe body and facilitates the dispersion of the force of the inner steel pipe body by arranging a first cushion layer and a second cushion layer on both sides of the inner steel pipe body, improves the stability of the support by arranging a support layer of a hexagonal steel pipe structure, and facilitates the transmission of the force borne by the outer steel pipe body and the inner steel pipe body to each other by connecting the parallel surfaces of the hexagonal steel pipe with the first cushion layer or the second cushion layer.

[0017] By providing the first cushion layer and the second cushion layer with two layers, each of which includes a rubber layer to realize an elastically compressed space, and by providing one layer of a polytetrafluoroethylene layer and a nylon layer to improve the pressure resistance and low temperature resistance, by providing a threaded connection between the connecting inner cylinder and the connecting outer cylinder, the connecting outer cylinder can be driven to rotate by rotating the connecting cylinder, and the connecting outer cylinder moves on the connecting inner cylinder under the action of the threaded structure to expose connecting inner cylinders with different outer diameters, so that the connecting mechanism can be connected to inner steel pipe bodies with different inner diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a side structural schematic diagram of the utility model;

[0020] Figure 3 It is a partial cross-sectional enlarged structural schematic diagram of the utility model;

[0021] Figure 4 This is a schematic diagram of the connecting inner cylinder structure of the utility model.

[0022] In the figure: 1-outer steel pipe body, 11-inner steel pipe body, 12-first cushion layer, 13-second cushion layer, 14-support layer, 15-clamping groove, 16-abutment groove, 2-connecting mechanism, 21-connecting cylinder, 22-connecting outer cylinder, 23-connecting inner cylinder, 24-clamping block, 25-connecting ring, 26-sealing gasket, 27-connecting flange, 28-connecting bolt. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0024] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] An embodiment, such as Figures 1 to 4 As shown, this embodiment provides a high-pressure and low-temperature resistant seamless steel pipe, comprising an outer steel pipe body 1, an inner steel pipe body 11 arranged inside the outer steel pipe body 1, a support layer 14 arranged between the outer steel pipe body 1 and the inner steel pipe body 11, and a connecting mechanism 2 connected to the end of the outer steel pipe body 1;

[0027] refer to Figure 1 and Figure 2 As shown, in this embodiment, the inner steel pipe body 11 is arranged inside the outer steel pipe body 1, and the inner steel pipe body 11 is provided with a cavity structure to reduce the manufacturing raw materials and can be transmitted through the cavity. In this embodiment, a support layer 14 is provided between the outer steel pipe body 1 and the inner steel pipe body 11. In this embodiment, the support layer 14 is preferably set to be formed by a ring-shaped connection structure formed by a plurality of regular hexagonal steel pipes around the inner wall of the inner and outer steel pipe bodies 1 or the outer wall of the inner steel pipe body 11 in the prior art, and in this embodiment, the regular hexagonal steel pipe also adopts a cavity structure to reduce the overall weight and material of the product;

[0028] In this embodiment, the outer end of the support layer 14 is bonded to the outer steel pipe body 1 and is provided with a first cushion layer 12, and the inner end of the support layer 14 is bonded to the inner steel pipe body 11 and is provided with a second cushion layer 13, wherein the first cushion layer 12 and the second cushion layer 13 are composed of at least one rubber layer and a polytetrafluoroethylene layer and a nylon layer, and each pair of parallel surfaces of a plurality of hexagonal steel pipes in this embodiment are connected to the first cushion layer 12 or the second cushion layer 13. When in use, by arranging the support layer 14 between the outer steel pipe body 1 and the inner steel pipe body 11, the outer steel pipe body 1 When the outer steel pipe body 1 is subjected to a large pressure, the force is transmitted to the support layer 14 to improve the support bearing capacity. In low temperature and severe weather, when the water or other liquid inside the inner steel pipe body 11 expands in volume due to freezing, the inner steel pipe body 11 transmits the force to the support layer 14 to provide support bearing capacity. The first cushion layer 12 and the second cushion layer 13 are both provided with two layers, and each layer includes a rubber layer to realize an elastically compressed space. In addition, one of the polytetrafluoroethylene layer and the nylon layer is provided to improve the pressure resistance and low temperature resistance.

[0029] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the connecting mechanism 2 includes a connecting tube 21, wherein the connecting tube 21 is provided with a hole adapted to the inner diameter of the inner steel pipe body 11, and the connecting tube 21 is fixedly provided with a connecting outer tube 22, wherein the connecting outer tube 22 is threadedly connected with a connecting inner tube 23, and in this embodiment, the connecting inner tube 23 is preferably provided with a structure with an outer diameter gradually expanding from the inside of the inner steel pipe body 11 to the outside, and a threaded structure is provided on the outer wall of the connecting inner tube 23 to be fitted and connected with the connecting outer tube 22.

[0030] In the present embodiment, an annular clamping groove 15 is provided at the end of the inner steel pipe body 11, wherein the clamping groove 15 is provided with a plurality of abutting grooves 16 in a circumferential array, wherein a clamping block 24 is provided at the end of the inner tube 23, wherein the clamping block 24 is adapted to clamp with the abutting groove 16, and in the present embodiment, the end of the outer tube 22 is clamped with the outer wall of the outer steel pipe body 1, and a connecting ring 25 is further provided at the end of the outer tube 22, and the connecting ring 25 is provided with a sealing gasket 26, and the outer steel pipe body 1 is provided with a connecting flange 27 which is connected to the connecting ring 25 by a connecting bolt 28.

[0031] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A high pressure and low temperature resistant seamless steel pipe, characterized in that: It comprises an outer steel pipe body (1), an inner steel pipe body (11) arranged inside the outer steel pipe body (1), a support layer (14) arranged between the outer steel pipe body (1) and the inner steel pipe body (11) for increasing the support strength, and a connection mechanism (2) connected to the end of the outer steel pipe body (1); A first cushion layer (12) for achieving connection is also provided between the support layer (14) and the outer steel pipe body (1), and a second cushion layer (13) for achieving connection is also provided between the support layer (14) and the inner steel pipe body (11).

2. A high pressure and low temperature resistant seamless steel pipe according to claim 1, characterized in that: The support layer (14) is configured as a plurality of regular hexagonal steel pipes in an annular connection structure, and each pair of parallel surfaces of the plurality of hexagonal steel pipes is connected to the first cushion layer (12) or the second cushion layer (13).

3. A high pressure and low temperature resistant seamless steel pipe according to claim 2, characterized in that: The first cushion layer (12) and the second cushion layer (13) at least include a rubber layer and any one of a polytetrafluoroethylene layer and a nylon layer.

4. The high pressure and low temperature resistant seamless steel pipe according to claim 1, characterized in that: An annular clamping groove (15) is provided at the end of the inner steel pipe body (11), and the clamping groove (15) of the inner steel pipe body (11) is provided with an abutment groove (16) for clamping with the connection mechanism (2).

5. The high pressure and low temperature resistant seamless steel pipe according to claim 4, characterized in that: The connection mechanism (2) comprises a connection tube (21), the connection tube (21) being provided with a hole matching the inner diameter of the inner steel pipe body (11), and the connection tube (21) being fixedly provided with a connection outer tube (22), the connection outer tube (22) being threadedly connected with a connection inner tube (23), and the connection inner tube (23) being provided with a structure having an outer diameter gradually expanding from the inside of the inner steel pipe body (11) to the outside, and a threaded structure being provided on the outer wall of the connection inner tube (23) to be connected with the connection outer tube (22).

6. The high-pressure and low-temperature resistant seamless steel pipe according to claim 5, characterized in that: The end of the connecting inner cylinder (23) is provided with a clamping block (24) adapted to the abutting groove (16); The end of the connecting outer tube (22) is clamped to the outer wall of the outer steel tube body (1), and a connecting ring (25) is also provided at the end of the connecting outer tube (22), and a sealing gasket (26) is provided on the connecting ring (25). The outer steel tube body (1) is sleeved with a connecting flange (27) and connected to the connecting ring (25) by means of connecting bolts (28).

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