Divided-flow type double-layer PE sleeve

Abstract

The utility model relates to a split-flow type double-layer PE (Poly Ethylene) sleeve. The double-layer sleeve solves the problem that in the prior art, it is difficult to reduce the temperature influence on an inlet flow channel while rapidly cooling an outlet flow channel through a double-layer sleeve. The cooling pipe comprises a PE inner pipe, a PE outer pipe is arranged on the outer side of the PE inner pipe in the circumferential direction, an outer flow guide cavity is formed between the PE inner pipe and the PE outer pipe, an inner flow guide cavity is formed in the inner side of the PE inner pipe in the circumferential direction, the inner flow guide cavity and the outer flow guide cavity are arranged in a spaced mode, a spaced cooling mechanism is arranged on the outer side of the PE inner pipe in the circumferential direction, and a supporting assembly used for positioning the spaced cooling mechanism is arranged in the outer flow guide cavity. And the end parts of the PE inner pipe and the PE outer pipe are sealed through a flow guide cover body. The cooling device has the advantages of being simple in structure, convenient to use, good in practicability, capable of greatly reducing the influence on the temperature of fluid flowing into the outer flow guide cavity while cooling, and good in using effect.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe fittings, in particular to a split-flow double-layer PE casing pipe. Background Art

[0002] Reactor coolant pumps and other pump units used in multi-purpose modular small reactors and other fields are installed in double-layer casing flow channels, that is, the pump hydraulic structure is placed in whole or in part in the system pipeline, the pipeline is used as the pump casing or part of the pump casing, the annular cavity between the outer casing and the inner casing is connected to the pump inlet as the pump inlet flow channel, and the inner casing is connected to the pump outlet as the pump outlet flow channel. This arrangement is compact and conducive to the miniaturization of systems and equipment. However, under this arrangement, since the double-layer casing flow channel is not a guide structure specially designed according to the hydraulic performance of the pump, the flow field at the pump inlet is turbulent; and the support structure of the inner casing needs to be connected to the outer casing, which will further disrupt the pump inlet flow field and reduce the hydraulic performance of the pump; in addition, since the fluid in the outlet flow channel needs to be cooled, while the inlet flow channel uses normal temperature fluid, the double-layer casing in the prior art is difficult to quickly cool the outlet flow channel while reducing the temperature impact on the inlet flow channel, and the use effect is not good.

[0003] In order to solve the deficiencies of the existing technology, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a double-layer casing flow channel guide support structure [CN202210848446.4], which includes a guide support structure body; the guide support structure body is cylindrical, the inlet end of the guide support structure body is connected to the outlet end of the inner casing, and the inner casing is connected to the pump outlet of the pump unit through the guide support structure body; the guide support structure body is evenly distributed with a plurality of ears in the circumferential direction, and the guide support structure body is connected to the outer casing through the ears; a guide device is provided on the ears, and the guide device is located between the inner casing and the outer casing; the guide direction of the guide device is in the direction of the water flow.

[0004] The above solution solves the problem of turbulent flow field at the inlet of the double-layer casing in the prior art to a certain extent, which reduces the hydraulic performance. However, the solution still has many shortcomings. For example, it is difficult to quickly cool the outlet flow channel while reducing the temperature impact on the inlet flow channel, and the use effect is not good. Summary of the invention

[0005] The utility model aims to provide a split-flow double-layer PE casing pipe in view of the above problems.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a split-flow double-layer PE casing, comprising a PE inner tube, a PE outer tube is arranged on the circumferential outer side of the PE inner tube, an outer guide cavity is formed between the PE inner tube and the PE outer tube, and an inner guide cavity is formed on the circumferential inner side of the PE inner tube, the inner guide cavity and the outer guide cavity are arranged at intervals from each other, an interval-type cooling mechanism is arranged on the circumferential outer side of the PE inner tube, a support assembly for positioning the interval-type cooling mechanism is arranged in the outer guide cavity, and the ends of the PE inner tube and the PE outer tube are closed by a guide cover.

[0007] In the above-mentioned split-flow double-layer PE casing, a cooling layer is provided on the circumferential inner side of the PE inner tube, the circumferential inner wall of the cooling layer surface is covered with a galvanized coating, and the above-mentioned inner flow guide cavity is formed on the circumferential inner side of the galvanized coating.

[0008] In the above-mentioned split-flow double-layer PE casing, the interval cooling mechanism includes a cooling casing tightly fitted on the circumferential outer wall of the PE inner tube, a barrier casing is provided on the circumferential outer side of the cooling casing, and an interval loading cavity is formed between the barrier casing and the cooling casing, and a coolant guide component is provided in the interval loading cavity.

[0009] In the above-mentioned split-flow double-layer PE casing, a cooling liquid inlet cavity is provided on the inner side of the cooling casing in the circumferential direction.

[0010] In the above-mentioned diversion type double-layer PE casing, the coolant guide assembly includes a plurality of guide nodes arranged in the interval loading cavity, the guide nodes are connected axially by longitudinal inlet pipes, and the guide nodes are connected circumferentially by arc-shaped diversion pipes, and the guide nodes form a cooling guide network through the longitudinal inlet pipes and the arc-shaped diversion pipes.

[0011] In the above-mentioned flow-dividing double-layer PE casing, the arc-shaped flow-dividing pipe is hollowly arranged in the interval loading cavity, and the flow-guiding node and the coolant inlet cavity are interconnected.

[0012] In the above-mentioned flow-dividing double-layer PE casing, a barrier portion is provided between the flow-guiding node and the inner wall of the barrier casing.

[0013] In the above-mentioned diversion type double-layer PE casing, the support assembly includes a mounting casing arranged on the circumferential inner wall of the PE outer tube, the circumferential inner wall of the mounting casing is provided with a plurality of arc-shaped support parts, and the arc-shaped support parts are connected to the outer wall of the barrier casing through support connecting parts, and the support connecting parts are provided with flow holes.

[0014] In the above-mentioned split-flow double-layer PE casing, an inner flow inlet pipe interconnected with the inner flow guide cavity is provided on the flow guide cover body, a coolant inlet pipe connected to the longitudinal flow inlet pipe is provided on one side of the inner flow inlet pipe, and an outer flow inlet pipe is provided on the side of the coolant inlet pipe away from the inner flow inlet pipe.

[0015] In the above-mentioned split-flow double-layer PE casing, an insert cylinder is provided inside the flow guide cover, and a connecting cylinder portion corresponding to the insert cylinder portion is provided at the end of the PE inner tube, and an inner connecting flow pipe corresponding to the inner flow inlet pipe is provided on the connecting cylinder portion, a coolant access pipe corresponding to the coolant inlet pipe is provided on one side of the inner flow connecting pipe, and an outer connecting flow pipe connected to the outer flow inlet pipe is provided on the outer side of the connecting cylinder portion.

[0016] Compared with the existing technology, the advantages of the utility model are: simple structure, convenient use and good practicality. By arranging an interval cooling mechanism on the outer side of the PE inner tube, not only can the fluid flowing out of the inner guide cavity be effectively and continuously cooled, but also the influence of the temperature of the fluid flowing into the outer guide cavity is greatly reduced while cooling, and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the utility model;

[0018] Figure 2 It is a cross-sectional view of the utility model;

[0019] Figure 3 It is a schematic diagram of the diversion node structure in the utility model;

[0020] Figure 4 This is a schematic diagram of the connection structure between the flow guide cover and the end of the PE inner pipe in the utility model;

[0021] In the figure: PE inner tube 1, inner guide cavity 11, cold conduction layer 12, galvanized coating 13, PE outer tube 2, outer guide cavity 21, interval cooling mechanism 3, cooling sleeve 31, barrier sleeve 32, interval loading cavity 33, support assembly 4, assembly sleeve 41, arc-shaped support part 42, support connection part 43, flow hole 44, guide cover 5, inner inlet pipe 51, coolant inlet pipe 52, outer inlet pipe 53, plug-in cylinder 54, coolant guide assembly 6, guide node 61, longitudinal inlet pipe 62, arc-shaped diverter pipe 63, barrier part 64, connecting cylinder 7, inner connecting flow pipe 71, cold liquid access pipe 72, outer connecting flow pipe 73. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1-4As shown, a split-flow double-layer PE casing comprises a PE inner tube 1, a PE outer tube 2 is arranged on the circumferential outer side of the PE inner tube 1, an outer guide cavity 21 is formed between the PE inner tube 1 and the PE outer tube 2, and an inner guide cavity 11 is formed on the circumferential inner side of the PE inner tube 1, the inner guide cavity 11 and the outer guide cavity 21 are arranged at intervals from each other, an interval-type cooling mechanism 3 is arranged on the circumferential outer side of the PE inner tube 1, a support assembly 4 for positioning the interval-type cooling mechanism 3 is arranged in the outer guide cavity 21, and the ends of the PE inner tube 1 and the PE outer tube 2 are closed by a guide cover 5.

[0024] The outer flow guide cavity 21 is used for the inflow of normal temperature or low temperature fluid, and the inner flow guide cavity 11 is used for the outflow of high temperature fluid. The interval cooling mechanism 3 is used to perform continuous circumferential cooling treatment on the PE outer pipe 2, and uses a barrier design to reduce the impact on the fluid temperature in the outer flow guide cavity 21.

[0025] Among them, a cooling layer 12 is provided on the inner side of the PE inner tube 1 in the circumferential direction, and the inner wall of the cooling layer 12 is covered with a galvanized coating 13 in the circumferential direction, and the inner flow guide cavity 11 is formed on the inner side of the galvanized coating 13 in the circumferential direction.

[0026] The heat-conducting layer is used to improve the conduction efficiency of the coolant, and the galvanized coating 13 is used to prevent the long-term high-temperature fluid from damaging the pipe wall of the PE inner pipe 1.

[0027] It can be seen that the interval cooling mechanism 3 includes a cooling sleeve 31 tightly fitted on the circumferential outer wall of the PE inner tube 1, a barrier sleeve 32 is provided on the circumferential outer side of the cooling sleeve 31, and an interval loading cavity 33 is formed between the barrier sleeve 32 and the cooling sleeve 31, and a coolant guide component 6 is provided in the interval loading cavity 33.

[0028] Obviously, the cooling sleeve 31 has a cooling liquid inlet cavity on the inner side thereof.

[0029] The barrier sleeve 32 is made of heat-insulating and cold-insulating materials to prevent the heat absorbed by the interval-type cooling mechanism 3 from being transferred to the outer flow guide cavity 21 .

[0030] Furthermore, the coolant guide assembly 6 includes a plurality of guide nodes 61 arranged in the interval loading cavity 33, the guide nodes 61 are axially connected by longitudinal inlet pipes 62, and the guide nodes 61 are circumferentially connected by arc-shaped diverter pipes 63, and the guide nodes 61 form a cooling guide network through the longitudinal inlet pipes 62 and the arc-shaped diverter pipes 63.

[0031] The cooling liquid is introduced through the longitudinal inlet pipe 62 and circumferentially diverted through the arc-shaped diversion pipe 63 . The entering cooling liquid passes through the diversion node 61 and enters the cooling liquid inlet cavity to conduct the heat of the cooling sleeve 31 .

[0032] Specifically, the arc-shaped shunt pipe 63 is hollowly arranged in the spacer loading cavity 33 , and the flow guiding node 61 is communicated with the coolant inlet cavity.

[0033] Furthermore, a blocking portion 64 is provided between the flow guiding node 61 and the inner wall of the blocking sleeve 32 .

[0034] The blocking portion 64 is made of heat-insulating and cold-insulating materials to prevent heat conduction of the coolant.

[0035] More specifically, the support assembly 4 includes a mounting sleeve 41 arranged on the circumferential inner wall of the PE outer tube 2, a plurality of arc-shaped support portions 42 are provided on the circumferential inner wall of the mounting sleeve 41, and the arc-shaped support portions 42 are connected to the outer wall of the barrier sleeve 32 through support connecting portions 43, and the support connecting portions 43 are provided with flow holes 44.

[0036] The flow hole 44 is designed for four-way flow, which reduces the impact on the fluid flow rate while ensuring the supporting effect.

[0037] In detail, the guide cover body 5 is provided with an inner flow inlet pipe 51 which is interconnected with the inner guide cavity 11, a coolant inlet pipe 52 connected to the longitudinal flow inlet pipe 62 is provided on one side of the inner flow inlet pipe 51, and an outer flow inlet pipe 53 is provided on the side of the coolant inlet pipe 52 away from the inner flow inlet pipe 51.

[0038] Preferably, a plug-in cylinder 54 is provided on the inner side of the guide cover body 5, and a connecting cylinder portion 7 corresponding to the plug-in cylinder 54 is provided at the end of the PE inner tube 1, and an inner connecting flow pipe 71 corresponding to the inner flow inlet pipe 51 is provided on the connecting cylinder portion 7, a coolant access pipe 72 corresponding to the coolant inlet pipe 52 is provided on one side of the inner flow connecting pipe 71, and an outer connecting flow pipe 73 connected to the outer flow inlet pipe 53 is provided on the outer side of the connecting cylinder portion 7.

[0039] In summary, the principle of this embodiment is: by arranging an interval cooling mechanism 3 on the circumferential outer side of the PE inner tube 1 to introduce coolant to form a cooling diversion network, circumferential heat conduction of the fluid in the inner diversion cavity 11 is realized, and the cooling efficiency is improved. Secondly, a cold-insulating and heat-insulating support component 4 is used to support the outer wall of the interval cooling mechanism 3, and the arc-shaped diversion pipe 63 loaded with coolant and the diversion node 61 are separated from the outer diversion cavity 21 by the blocking sleeve 32 and the blocking part 64, thereby ensuring that the fluid in the inner diversion cavity 11 is cooled while reducing the impact on the fluid temperature in the outer diversion cavity 21.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0041] Although the present invention uses more terms such as PE inner tube 1, inner flow guiding cavity 11, cooling layer 12, galvanized coating 13, PE outer tube 2, outer flow guiding cavity 21, interval cooling mechanism 3, cooling sleeve 31, barrier sleeve 32, interval loading cavity 33, support assembly 4, assembly sleeve 41, arc support part 42, support connection part 43, flow hole 44, flow guiding cover 5, inner inlet pipe 51, coolant inlet pipe 52, outer inlet pipe 53, plug-in cylinder 54, coolant flow guiding assembly 6, flow guiding node 61, longitudinal inlet pipe 62, arc-shaped flow dividing pipe 63, barrier part 64, connecting cylinder 7, inner connecting pipe 71, coolant access pipe 72, outer connecting pipe 73, etc., the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A split-flow double-layer PE casing, comprising a PE inner tube (1), wherein a PE outer tube (2) is arranged on the outer side of the PE inner tube (1), characterized in that: An outer flow guide cavity (21) is formed between the PE inner tube (1) and the PE outer tube (2), and an inner flow guide cavity (11) is formed on the inner side of the PE inner tube (1). The inner flow guide cavity (11) and the outer flow guide cavity (21) are arranged at intervals from each other. An interval type cooling mechanism (3) is provided on the outer side of the PE inner tube (1). A support assembly (4) for positioning the interval type cooling mechanism (3) is provided in the outer flow guide cavity (21), and the ends of the PE inner tube (1) and the PE outer tube (2) are sealed by a flow guide cover (5).

2. A split-flow double-layer PE casing according to claim 1, characterized in that: A cooling layer (12) is provided on the circumferential inner side of the PE inner tube (1), the circumferential inner wall of the cooling layer (12) is covered with a galvanized coating (13), and the inner flow guide cavity (11) is formed on the circumferential inner side of the galvanized coating (13).

3. A split-flow double-layer PE casing according to claim 1, characterized in that: The intermittent cooling mechanism (3) comprises a cooling sleeve (31) tightly fitted on the circumferential outer wall of the PE inner tube (1); a barrier sleeve (32) is provided on the circumferential outer side of the cooling sleeve (31); and an intermittent loading cavity (33) is formed between the barrier sleeve (32) and the cooling sleeve (31); a coolant guide component (6) is provided in the intermittent loading cavity (33).

4. A split-flow double-layer PE casing according to claim 3, characterized in that: The cooling sleeve (31) has a cooling liquid inlet cavity on the inner side in the circumferential direction.

5. A split-flow double-layer PE casing according to claim 4, characterized in that: The coolant guide assembly (6) includes a plurality of guide nodes (61) arranged in the interval loading cavity (33), wherein the guide nodes (61) are connected axially by longitudinal inlet pipes (62), and the guide nodes (61) are connected circumferentially by arc-shaped shunt pipes (63), and the guide nodes (61) form a cooling guide network through the longitudinal inlet pipes (62) and the arc-shaped shunt pipes (63).

6. A split-flow double-layer PE casing according to claim 5, characterized in that: The arc-shaped flow dividing pipe (63) is arranged in a hollow shape in the spacer loading cavity (33), and the flow guiding node (61) and the cooling liquid inlet cavity are communicated with each other.

7. A split-flow double-layer PE casing according to claim 5, characterized in that: A barrier portion (64) is provided between the flow guiding node (61) and the inner wall of the barrier sleeve (32).

8. A split-flow double-layer PE casing according to claim 3, characterized in that: The support assembly (4) comprises an assembly sleeve (41) arranged on the circumferential inner wall of the PE outer tube (2); the circumferential inner wall of the assembly sleeve (41) is provided with a plurality of arc-shaped support portions (42); the arc-shaped support portions (42) are connected to the outer wall of the barrier sleeve (32) via support connection portions (43); and the support connection portions (43) are provided with flow holes (44).

9. A split-flow double-layer PE casing according to claim 5, characterized in that: The guide cover (5) is provided with an inner flow inlet pipe (51) which is interconnected with the inner flow guide cavity (11); one side of the inner flow inlet pipe (51) is provided with a coolant introduction pipe (52) which is connected to the longitudinal flow inlet pipe (62); and an outer flow inlet pipe (53) is provided on the side of the coolant introduction pipe (52) away from the inner flow inlet pipe (51).

10. A split-flow double-layer PE casing according to claim 9, characterized in that: The inner side of the flow guide cover (5) is provided with a plug-in cylinder (54), and the end of the PE inner tube (1) is provided with a connecting cylinder (7) corresponding to the plug-in cylinder (54), and the connecting cylinder (7) is provided with an inner connecting flow pipe (71) corresponding to the inner flow inlet pipe (51), one side of the inner connecting flow pipe (71) is provided with a coolant inlet pipe (72) corresponding to the coolant inlet pipe (52), and the outer side of the connecting cylinder (7) is provided with an outer connecting flow pipe (73) connected to the outer flow inlet pipe (53).

Images