CN101943298B - Vacuum composite delivery pipe and connecting structure - Google Patents

Abstract

The vacuum composite transmission pipe and its connection structure, including an inner pipe and an outer pipe, are characterized in that the inner pipe is a metal pipe, the outer pipe is a stainless steel vacuum insulation pipe, and the adjacent inner pipes are butt-welded as a whole. The adjacent outer tubes are axially connected by connecting pieces. The invention has the advantages of good heat preservation effect, long vacuum life, convenient maintenance and convenient on-site installation, and is especially suitable for heat transmission in solar power generation, heat generation and chemical industry.

Description

Vacuum composite transmission pipe and connection structure

technical field

The invention relates to a high-temperature medium conveying pipe, in particular to a vacuum composite conveying pipe and a connection structure for conveying high-temperature steam, oil or molten salt, and is suitable for heat transmission in the field of solar power generation, heat generation and chemical industry.

Background technique

Heat transfer pipe is a pipe widely used in solar power generation, heating and chemical industry. Existing heat transfer pipes generally wrap one or more layers of insulation materials on the outer surface of ordinary pipes. In the field of solar power generation, heat transfer is required Pipes have a good thermal insulation effect, so it is necessary to wrap multiple layers of thermal insulation materials on the outer surface of ordinary pipes, resulting in relatively thick heat transfer pipes and unsatisfactory heat transfer effects.

Chinese patent CN201449074 discloses a utility model patent titled "Double Vacuum Long-Life Heat Collector Tube". This patent uses three layers of glass tubes, a double vacuum structure, and a getter is added to the double vacuum structure. The technical solution of this patent is applied to the heat transfer tube. Although the double vacuum tube itself has a good heat preservation effect, the glass tube is fragile and not suitable for long-distance transmission.

Contents of the invention

The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology, and provide a vacuum composite transmission pipe and connection structure with good heat preservation effect, long vacuum life, convenient maintenance and easy on-site installation.

In order to achieve the above object, the present invention adopts the following technical scheme: a vacuum composite transmission pipe and a connecting structure, including an inner pipe and an outer pipe, characterized in that the inner pipe is a metal pipe, and the outer pipe is a stainless steel vacuum insulation pipe, Adjacent inner tubes are butt-welded as a whole, and adjacent outer tubes are axially connected by connecting pieces.

In order to improve the heat insulation effect, a heat insulation layer can be provided between the inner and outer pipes, and the heat insulation layer is made of materials with radiation protection and heat preservation properties.

Preferably, the vacuum heat insulation pipe is a single-layer vacuum heat insulation pipe composed of two layers of pipes.

Preferably, the vacuum heat insulation pipe is a double-layer vacuum heat insulation pipe composed of three layers of pipes.

In the above solution, the axial connection between the adjacent outer pipes may be composed of a coupling and a seal. The threads on the outer surface of the coupling are matched with the threads on the inner surface of the coupling respectively with the threads on the outer surfaces of the ends of the two adjacent outer pipes. A seal is provided in the groove.

Furthermore, each layer of vacuum heat insulation pipe is made of stainless steel plate, and the end is welded with a sealing plug, which is sealed and welded between the inner and outer pipe end faces of each layer of vacuum heat insulation pipe, and the groove is arranged on the sealing plug. on the head.

In the above scheme, the axial connection between the adjacent outer tubes may also be composed of flanges, seals and connecting bolts, the flanges are welded to the ends of the outer tubes, and the gap between two adjacent outer tubes The flanges are connected by connecting bolts, and there are gaskets between the flanges.

Furthermore, each layer of vacuum heat insulation pipe is made of stainless steel plate, and the end is welded with a sealing plug, which is sealed and welded between the inner and outer pipe end faces of each layer of vacuum heat insulation pipe, and the flange is arranged on the sealing plug On the head, the flange is integrated with the sealing plug.

Preferably, a getter is placed inside the stainless steel vacuum heat insulation pipe, and the outer surface of the inner pipe of the stainless steel vacuum heat insulation pipe is coated or wound with a radiation-proof material.

In the above solution, the outer surfaces of the joints of two adjacent outer pipes are preferably coated with heat-insulating materials for partial heat-insulation treatment. To improve the thermal insulation effect at the seams.

Because the present invention adopts the composite structure of the outer layer vacuum tube and the inner layer metal tube, and the adjacent inner layer metal tubes are connected together by field welding, and the end faces of the adjacent outer layer vacuum tubes are sealed with gaskets, therefore, the present invention The vacuum composite transmission pipe itself not only has a good heat preservation effect, but also its connection parts can effectively prevent heat leakage, which greatly improves the heat insulation performance of the vacuum composite transmission pipe itself and its connection.

The invention has the advantages of good heat preservation effect, long vacuum life, convenient maintenance and convenient on-site installation, and is especially suitable for heat transmission in solar power generation, heat generation and chemical industry.

The present invention will be described in further detail below through the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of the present invention;

Fig. 2 is a partial enlarged view of place a in Fig. 1;

Fig. 3 is a schematic structural view of Embodiment 2 of the present invention;

Fig. 4 is a partial enlarged view of place b in Fig. 3;

Detailed ways

Embodiment 1: This embodiment consists of an inner pipe 1, an outer pipe and a heat insulation layer 2 arranged between the inner and outer pipes. The outer tube is a single-layer vacuum heat-insulation pipe composed of two layers of stainless steel pipes 3, or a double-layer vacuum heat-insulation pipe composed of three layers of stainless steel pipes 3, and the space between adjacent two layers of stainless steel pipes 3 is vacuumized. Vacuum insulation 4. Both ends of each vacuum heat insulation pipe are welded with a plug 5 for sealing the vacuum heat insulation layer 4, the plug 5 is sealed and welded to the end face of each layer of stainless steel pipe 3, and a ring of grooves is set on the outer end face of the plug , the axial connection between two adjacent outer pipes is connected by a connecting piece in this embodiment. The connecting piece in this embodiment is composed of a collar 6 and a sealing member 7. The collar 6 is a vacuum insulation collar, and its inner surface is provided with threads , to match the threads on the outer surface of the end of the outer pipe, the threads on the inner surface of the coupling are respectively connected to the threads on the outer surfaces of the ends of two adjacent outer pipes, and the seal is placed between the end plugs 5 of the two adjacent outer pipes in the groove.

The inner tube 1 is a metal tube.

When in use, the two adjacent inner pipes 1 are first welded and connected at the installation site along the axial direction; performance; secondly, put the outer tube on the heat insulation layer 2 on the outer surface of the inner tube, and place the seal 7 in the groove between the end face plugs 5 of two adjacent outer tubes; finally use the coupling 6. Connect two adjacent outer pipes in a threaded manner.

Embodiment 2: This embodiment is basically the same as Embodiment 1, the difference is that the axial connection between the adjacent outer tubes is composed of a flange 8, a gasket 10 and a connecting bolt 9, and the method The flange 8 is integrated with the plug 5 and welded to the end of the outer pipe. The flange 8 is connected by the connecting bolt 9 between two adjacent outer pipes, and a gasket 10 is placed between the flanges.

In the above embodiment, the outer surface of the connecting portion of two adjacent outer pipes may be covered with thermal insulation material for local thermal insulation treatment.

The heat transfer pipe of the present invention not only has a good heat insulation effect, but also has a good heat insulation performance at the connecting parts between adjacent pipes.

Claims (3)

1. compound transport tube of vacuum and linkage structure are managed and outer tube in comprising, it is characterized in that; Pipe is metal tube in said, and said outer tube is the stainless-steel vacuum heat insulating tube, and every layer of vacuum heat insulation tube processed by corrosion resistant plate; Every layer of vacuum heat-insulation tube end is welded with seal plug; Seal welding between plug and every layer of vacuum heat insulation tube inner and outer pipe end face, butt welding is whole between the adjacent interior pipe, is axially connected by link between the adjacent outer tube; Be placed with getter in the said stainless-steel vacuum heat insulating tube, and scribble or be wound with radiation proof material at the outer surface of the inner layer pipe of stainless-steel vacuum heat insulating tube; The outer surface of adjacent two outer tube connection parts coats thermal insulating material and carries out the partial insulation processing; Be provided with thermal-protective coating between the said inner and outer pipe, this thermal-protective coating is made up of the material with radiation proof and thermal insulation property;

Said link adopts any one in following two kinds:

First kind of link is made up of box cupling and Sealing; Said box cupling is the vacuum heat-insulation box cupling, and its internal surface is provided with screw thread, matches with the screw thread of outer tube end outer surface; Box cupling internal surface screw thread respectively with being threaded of adjacent two outer tube end outer surface; Along the circumferential direction be provided with a circle groove at the outer tunnel end face, be provided with Sealing in the groove between adjacent two outer tube end faces, groove is arranged on the seal plug;

Second kind of link is made up of flange, sealing gasket and connecting bolt, and said flange is welded in the outer tube end, and said flange and seal plug are connected as a single entity, and connected through connecting bolt by flange between adjacent two outer tubes, is lined with sealing gasket between the flange.

2. compound transport tube of vacuum according to claim 1 and linkage structure is characterized in that, said vacuum heat insulation tube is the individual layer vacuum heat insulation tube that is made up of two-layer pipeline.

3. compound transport tube of vacuum according to claim 1 and linkage structure is characterized in that, said vacuum heat insulation tube is the double-layer vacuum heat insulating tube that is made up of three layers of pipeline.

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