CN219329578U

CN219329578U - External pressure resistant MPP pipe

Info

Publication number: CN219329578U
Application number: CN202320185236.1U
Authority: CN
Inventors: 操晓峰; 叶茂生; 陈敦刚; 何礼捷
Original assignee: Hangzhou Lin'an Huatong Plastic Co ltd
Current assignee: Hangzhou Lin'an Huatong Plastic Co ltd
Priority date: 2023-01-30
Filing date: 2023-01-30
Publication date: 2023-07-11
Anticipated expiration: 2033-01-30

Abstract

The utility model discloses an external pressure resistant MPP (maximum power point) tube, which comprises an outer tube body and an inner tube body, wherein a sheath tube is sleeved on the outer side of the inner tube body, a pressure resistant layer is arranged between the sheath tube and the outer tube body, the pressure resistant layer consists of a plurality of pressure resistant strips symmetrically distributed along the center of the outer circumference of the sheath tube, and the length of the pressure resistant strips is equal to the lengths of the outer tube body and the inner tube body; the pressure-resistant strip is formed by integrally bending an inner supporting part, an outer supporting part and a pressure-reducing part, two ends of the inner supporting part are respectively symmetrically bent twice to form an L-shaped outer supporting part, and the end part of the outer supporting part is inwards bent to form an inclined pressure-reducing part. According to the utility model, the pressure-resistant layers are formed by arranging the pressure-resistant strips along the circumferential direction, and the pressure-resistant strips are integrally bent and formed by the metal plates, so that the pressure-resistant layers have certain elastic pressure-reducing capacity, and the pressure-resistant strips are equal to the outer pipe body and the inner pipe body, so that the pressure-resistant capacity of the outer pipe body and the inner pipe body can be integrally improved, and the problem of uneven pressure-resistant force caused by no support of a local cavity is solved.

Description

External pressure resistant MPP pipe

Technical Field

The utility model relates to the technical field of power cable installation, in particular to an external pressure resistant MPP pipe.

Background

The MPP pipe is also called MPP power cable protection pipe and is divided into an excavation type pipe and a non-excavation type pipe, the MPP non-excavation pipe is also called MPP jacking pipe or supporting pulling pipe, the MPP pipe adopts modified polypropylene as a main raw material, has the characteristics of high temperature resistance and external pressure resistance, and is suitable for high-voltage transmission line cable calandria pipe above 10 KV. However, the traditional MPP pipe cannot improve the compression resistance of the outer pipe body and the inner pipe body, so that the service life is reduced.

For this purpose, chinese patent: an external pressure resistant MPP pipe with the application number of CN202123088566.9 discloses: through setting up arc, movable block, supporting spring and along the guide slot, when suffering impact or pressure, the outer body can extrude a plurality of groups of arc to make its arc extrude supporting spring in the inside of circular slot, thereby can improve the compressive strength of outer body and interior body, can increase of service life.

However, arc, movable block, supporting spring and in the same direction as the guide slot in this scheme adopt interval distribution between outer body and interior body, lead to outer body and interior body in adjacent arc, movable block, supporting spring and in same direction as there is the cavity between the guide slot, cavity position cavity is unsupported, has local compressive strength not enough, the uneven problem of whole compressive effect.

For this purpose, we propose an external pressure resistant MPP tube to solve the above problems.

Disclosure of Invention

The utility model aims to provide an external pressure resistant MPP pipe, which solves the problems that a local cavity exists between an outer pipe body and an inner pipe body of the existing pressure resistant MPP pipe, the cavity is hollow and unsupported, the local pressure resistant force is insufficient, and the whole pressure resistant effect is uneven.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the MPP pipe resistant to external pressure comprises an outer pipe body and an inner pipe body, wherein a sheath pipe is sleeved on the outer side of the inner pipe body, a pressure-resistant layer is arranged between the sheath pipe and the outer pipe body, the pressure-resistant layer is composed of a plurality of pressure-resistant strips symmetrically distributed along the center of the outer circumference of the sheath pipe, and the length of the pressure-resistant strips is equal to that of the outer pipe body and the inner pipe body;

the pressure-resistant strip is formed by integrally bending an inner supporting part, an outer supporting part and a pressure-reducing part, two ends of the inner supporting part are respectively symmetrically bent twice to form an L-shaped outer supporting part, the end part of the outer supporting part is inwards bent to form an inclined pressure-reducing part, the inner supporting part is tightly attached to the outer wall of the protective sleeve pipe, and the outer supporting part is tightly attached to the inner wall of the outer pipe body.

In a further embodiment, the inner surface of the outer tube body is uniformly provided with limit strips along the circumferential direction, and the limit strips protrude from the inner surface of the outer tube body.

In a further embodiment, a limiting groove is formed between the adjacent outer supporting portions, the limiting grooves are in one-to-one correspondence with the limiting strips, and the limiting strips can be inserted into the limiting grooves.

In a further embodiment, the outer surface of the protective sleeve is uniformly provided with pressure reducing strips along the circumferential direction, and the pressure reducing strips protrude out of the outer surface of the protective sleeve.

In a further embodiment, a positioning groove is formed in the inner supporting portion, a decompression groove is formed between the adjacent decompression portions, and the decompression bar can penetrate through the positioning groove and be inserted into the decompression groove.

In a further embodiment, the inner surface of the sheath tube is uniformly provided with grooves along the circumferential direction, and the grooves are recessed toward the inner surface of the sheath tube.

In a further embodiment, the outer surface of the inner pipe body is provided with reinforcing ribs along the circumferential direction, the reinforcing ribs are in one-to-one correspondence with the strip grooves, and the reinforcing ribs can be clamped into the strip grooves.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the pressure-resistant layers are formed by arranging the pressure-resistant strips along the circumferential direction, and the pressure-resistant strips are integrally bent and formed by the metal plates, so that the pressure-resistant strips have certain elastic pressure-reducing capability and are clamped between the outer pipe body and the inner pipe body, so that the pressure-resistant capability of the inner pipe body is improved, the pressure-resistant strips are equal to the outer pipe body and the inner pipe body, the pressure-resistant capability of the outer pipe body and the inner pipe body can be integrally improved, and the problem of uneven pressure-resistant force caused by no support of a local cavity is solved.

Drawings

FIG. 1 is a schematic elevational cross-sectional view of the present utility model;

FIG. 2 is a schematic view of a three-dimensional partial structure of the pressure-resistant strip of the present utility model;

fig. 3 is a schematic view of a partial enlarged structure at a in fig. 1 according to the present utility model.

In the figure: 1. an outer tube body; 11. a limit bar; 2. a pressure-resistant layer; 21. pressure-resistant strips; 211. an inner support part; 2111. a positioning groove; 212. an outer support portion; 213. a decompression section; 3. a sheath tube; 31. a pressure reducing bar; 32. a strip groove; 4. an inner tube body; 41. reinforcing ribs; 5. a limit groove; 6. a decompression tank.

Detailed Description

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, an external pressure resistant MPP tube includes an inner tube body 4, a sheath tube 3 is sleeved on the outer side of the inner tube body 4, the sheath tube 3 can strengthen the pressure resistance of the inner tube body 4, a pressure resistant layer 2 is arranged on the outer side of the sheath tube 3, an outer tube body 1 is arranged on the outer side of the pressure resistant layer 2, when the outer tube body 1 is pressed, the pressure resistant layer 2 can reduce the pressure of the sheath tube 3, the pressure resistant layer 2 is composed of a plurality of pressure resistant strips 21 distributed along the central symmetry of the outer circumference of the sheath tube 3, the length of the pressure resistant strips 21 is equal to the lengths of the outer tube body 1 and the inner tube body 4, and then the whole is the inner tube body 4 for pressure reduction.

Referring to fig. 2, the pressure-resistant strip 21 is formed by integrally bending a metal plate to form an inner supporting portion 211, an outer supporting portion 212 and a pressure-reducing portion 213, and is convenient to produce and process, wherein the inner supporting portion 211 is tightly attached to the outer wall of the sheath tube 3, and is arc-shaped, two ends of the inner supporting portion 211 are symmetrically bent to form an L-shaped outer supporting portion 212 respectively, the outer supporting portion 212 is tightly attached to the inner wall of the outer tube body 1, and is also arc-shaped, the end of the outer supporting portion 212 is bent inwards to form an inclined pressure-reducing portion 213, the movable end of the pressure-reducing portion 213 is not contacted with the inner supporting portion 211, a pressure-reducing cavity is formed inside the pressure-resistant strip 21, and the pressure-reducing effect is convenient to improve.

Referring to fig. 3, in order to ensure that the outer tube 1 and the pressure-resistant layer 2 cannot deflect axially after being assembled, the inner surface of the outer tube 1 is uniformly provided with a limiting strip 11 along the circumferential direction, the limiting strip 11 protrudes from the inner surface of the outer tube 1, a limiting groove 5 is formed between adjacent outer supporting portions 212, and the limiting grooves 5 and the limiting strips 11 are in one-to-one correspondence, and as the limiting strips 11 can be inserted into the limiting grooves 5, the limiting strips 11 and the outer supporting portions 212 are mutually limited, so that deflection is avoided.

Referring to fig. 3, in order to ensure that the protective sleeve 3 and the pressure-resistant layer 2 cannot deflect axially after being assembled, the outer surface of the protective sleeve 3 is uniformly provided with pressure-reducing strips 31 along the circumferential direction, the pressure-reducing strips 31 not only can enhance the surface strength of the protective sleeve 3, but also have certain elasticity, the pressure-reducing strips 31 protrude out of the outer surface of the protective sleeve 3, positioning grooves 2111 are formed in the inner supporting portions 211, pressure-reducing grooves 6 are formed between adjacent pressure-reducing portions 213, the pressure-reducing strips 31 can penetrate through the positioning grooves 2111 and are inserted into the pressure-reducing grooves 6, the pressure-reducing portions 213 are attached to the pressure-reducing strips 31, the effect of mutually limiting and avoiding deflection can be achieved, when the pressure-reducing portions 213 are extruded by external pressure, the pressure-reducing strips 31 are extruded, and certain deformation is further generated to weaken the pressure, the pressure-reducing effect is achieved, and the whole pressure-resistant capability is further improved.

Referring to fig. 3, in order to ensure that the sheath tube 3 and the inner tube 4 will not deflect axially after being assembled, the inner surface of the sheath tube 3 is uniformly provided with the grooves 32 along the circumferential direction, the grooves 32 are recessed toward the inner surface of the sheath tube 3, the outer surface of the inner tube 4 is provided with the reinforcing ribs 41 along the circumferential direction, the reinforcing ribs 41 not only can strengthen the compressive strength of the inner tube 4, but also correspond to the grooves 32 one by one, and the reinforcing ribs 41 can be clamped into the grooves 32, so that the reinforcing ribs 41 and the sheath tube 3 are mutually limited to prevent deflection.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides an MPP pipe of resistant external pressure, includes outer body (1) and interior body (4), its characterized in that: the outer side of the inner pipe body (4) is sleeved with a protective sleeve (3), a pressure-resistant layer (2) is arranged between the protective sleeve (3) and the outer pipe body (1), the pressure-resistant layer (2) is composed of a plurality of pressure-resistant strips (21) which are symmetrically distributed along the center of the outer circumference of the protective sleeve (3), and the length of each pressure-resistant strip (21) is equal to that of the outer pipe body (1) and that of the inner pipe body (4);

the pressure-resistant strip (21) is formed by integrally bending an inner supporting part (211), an outer supporting part (212) and a pressure-reducing part (213), two ends of the inner supporting part (211) are respectively symmetrically bent twice to form an L-shaped outer supporting part (212), the end part of the outer supporting part (212) is inwards bent to form an inclined pressure-reducing part (213), the inner supporting part (211) is tightly attached to the outer wall of the sheath tube (3), and the outer supporting part (212) is tightly attached to the inner wall of the outer tube body (1).

2. The external pressure resistant MPP tube of claim 1, wherein: the inner surface of the outer pipe body (1) is uniformly provided with limit strips (11) along the circumferential direction, and the limit strips (11) protrude out of the inner surface of the outer pipe body (1).

3. The external pressure resistant MPP tube of claim 2, wherein: and a limiting groove (5) is formed between the adjacent outer supporting parts (212), the limiting grooves (5) are in one-to-one correspondence with the limiting strips (11), and the limiting strips (11) can be inserted into the limiting grooves (5).

4. The external pressure resistant MPP tube of claim 1, wherein: the outer surface of the sheath tube (3) is uniformly provided with a pressure reducing strip (31) along the circumferential direction, and the pressure reducing strip (31) protrudes out of the outer surface of the sheath tube (3).

5. An external pressure resistant MPP tube according to claim 4, wherein: a positioning groove (2111) is formed in the inner supporting portion (211), a decompression groove (6) is formed between the adjacent decompression portions (213), and the decompression strip (31) can penetrate through the positioning groove (2111) and be inserted into the decompression groove (6).

6. The external pressure resistant MPP tube of claim 1, wherein: the inner surface of the sheath tube (3) is uniformly provided with strip grooves (32) along the circumferential direction, and the strip grooves (32) are recessed towards the inner surface of the sheath tube (3).

7. An external pressure resistant MPP tube according to claim 6, wherein: the outer surface of the inner pipe body (4) is provided with reinforcing ribs (41) along the circumferential direction, the reinforcing ribs (41) are in one-to-one correspondence with the strip grooves (32), and the reinforcing ribs (41) can be clamped into the strip grooves (32).