CN204573352U - A kind of thermal insulation pipe - Google Patents

Abstract

The utility model discloses a thermal insulation pipe, which belongs to the field of fluid delivery pipes. The heat preservation pipe is made of plastic material, and the heat preservation pipe includes an outer pipe, a corrugated pipe and an inner pipe from the outside to the inside, the outer pipe is coated on the corrugated pipe, and the corrugated pipe and the A first airtight space is formed between the outer tubes, the inner tube is inserted into the bellows, and seals are provided in the grooves at both ends of the bellows that are in contact with the inner tube, and the seals make The bellows and the inner tube form a second closed space. The utility model is made of plastic material, which is not easy to corrode, prolongs the service life, transports the fluid through the inner tube, forms a physical support through the corrugated tube and the outer tube, increases the ring stiffness, and has the characteristics of good pressure resistance. The first airtight space and the second airtight space form two airtight air structures, which have the characteristics of good heat preservation effect.

Description

a thermal insulation pipe

technical field

The utility model relates to the field of fluid delivery pipes, in particular to a thermal insulation pipe.

Background technique

Fluid conveying pipes are pipes used to convey fluids such as water, oil, and gas, and are mainly used to convey fluids in engineering and large-scale equipment. Take the heating pipe network as an example to illustrate:

my country's heating pipe network is dominated by steel pipes, which are prone to corrosion. Generally, the steel pipe network will be severely corroded after 5 to 8 years of use, resulting in serious pressure loss. It needs to be replaced in time, resulting in increased engineering costs.

On July 31, 2013, the executive meeting of the State Council clarified the six key tasks of strengthening urban infrastructure construction. In order to make up for the "short board" in urban development, it was determined that by 2015, 80,000 kilometers of urban gas and nearly 100,000 kilometers of urban gas would be completed. The task of transforming the old central heating pipe network in the northern heating area. Therefore, there are serious old problems in the heating pipe network at present.

Utility model content

In order to solve the problem that the steel pipes in the prior art are easy to corrode and lead to short service life, the embodiment of the utility model provides a thermal insulation pipe. Described technical scheme is as follows:

A heat preservation pipe, the heat preservation pipe is made of plastic material, the heat preservation pipe includes an outer pipe, a corrugated pipe and an inner pipe from the outside to the inside, the outer pipe is coated on the corrugated pipe, and the A first airtight space is formed between the bellows and the outer tube, the inner tube is inserted into the bellows, the grooves at both ends of the bellows are in contact with the inner tube are provided with seals, through The seal makes the bellows and the inner tube form a second closed space.

Specifically, the material selected for the bellows and the outer tube is compatible.

Specifically, both the outer tube and the bellows are made of high elastic modulus polypropylene material.

Specifically, the inner tube is made of heat-resistant polyethylene type II material.

Specifically, the sealing member is a foamed flexible rubber and plastic sealing ring.

Specifically, the sealing member is a foamed flexible rubber and plastic sealing strip.

Specifically, the seal is poured polyurethane foam.

Specifically, the cross section of the bellows is rectangular.

The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

The heat preservation pipe of the utility model is made of plastic material, which is not easy to corrode, prolongs the service life of the heat preservation pipe, transports fluid through the inner pipe, forms physical support through the corrugated pipe and the outer pipe, increases the ring stiffness, and has It has the characteristics of good pressure resistance, and forms two closed air structures through the first closed space and the second closed space, which has the characteristics of good heat preservation effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a structural diagram of a thermal insulation pipe provided by an embodiment of the present invention.

The meanings of the symbols in the figure are as follows:

1 outer tube,

2 bellows, 21 grooves,

3 inner tubes,

4 seals,

5 The first confined space,

6 Second confined space.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the utility model provides a heat preservation pipe, the heat preservation pipe is made of plastic material, and the heat preservation pipe includes an outer pipe 1, a corrugated pipe 2 and an inner pipe 3 from the outside to the inside. The outer tube 1 is covered on the bellows 2, and a first airtight space 5 is formed between the bellows 2 and the outer tube 1, the inner tube 3 is inserted into the bellows 2, and the bellows Both ends of the tube 2 are provided with seals 4 in the grooves 21 in contact with the inner tube 3 , and the bellows 2 and the inner tube 3 form a second closed space 6 through the seals 4 .

Wherein, the first enclosed space 5 specifically refers to the space formed by the groove 21 of the bellows 2 and the outer pipe 1 , and the second enclosed space 6 specifically refers to the space formed by the groove 21 of the bellows 2 and the inner pipe 3 .

The heat preservation pipe of the utility model is made of plastic material, which is not easy to corrode, prolongs the service life of the heat preservation pipe, transports fluid through the inner pipe 3, forms physical support through the corrugated pipe 2 and the outer pipe 1, and increases the Rigidity has the characteristics of good pressure resistance. Through the seal 4, it can seal and reduce the heat exchange caused by air convection. Two closed air structures are formed through the first closed space 5 and the second closed space 6. Using the middle The air is used as the heat insulation layer. Due to the low thermal conductivity of the air, the heat transfer forms are mainly convection transfer and radiation transfer, so an airtight heat insulation layer is formed to prevent convective heat transfer and has the characteristics of good heat preservation effect.

Specifically, the materials selected for the bellows 2 and the outer tube 1 are compatible. Through the above structure, it is convenient to produce the outer layer by co-extrusion coating.

Specifically, both the outer tube 1 and the bellows 2 are made of high elastic modulus polypropylene (PP-HM) material. Polypropylene with high elastic modulus is a special material for large-diameter drainage pipes of 1000-3500 mm, which can support and prevent deformation. At the same time, the thermal conductivity of polypropylene is lower than that of polyethylene, which is beneficial to better prevent heat loss.

Specifically, the inner pipe 3 is made of heat-resistant polyethylene type II (PE-RT II) material. Through the above material selection, the inner pipe 3 can transport hot water at 50-85°C, so that the heat preservation pipe has the functions of heat resistance and heat preservation, making the heat preservation pipe especially suitable for heating pipelines.

Specifically, the sealing member 4 is a foamed flexible rubber and plastic sealing ring. Through the above structure, it can seal and reduce heat exchange caused by air convection.

Specifically, the sealing member 4 is a foamed flexible rubber and plastic sealing strip. Through the above structure, it can seal and reduce heat exchange caused by air convection.

Specifically, the sealing member 4 is poured polyurethane foam. Through the above structure, not only the sealing effect between the bellows 2 and the inner tube 3 can be achieved, but also the inner tube 3 and the bellows 2 can be fixed together, making the structure more reliable.

During specific implementation, the outer tube 1 is provided with small holes, and foamed polyurethane is poured through the small holes.

Specifically, the cross section of the bellows 2 is a rectangular tooth shape. Through the above structure, a good thermal insulation effect can be formed.

Manufacturing process of the present utility model:

1. Produce the inner pipe 3 with a solid pipe production line, such as PE-RT I I pipe;

2. The corrugated pipe 2 is produced by the corrugated pipe 2 material production line, and then co-extruded and coated to produce the cladding layer, that is, the outer pipe 1;

3. Embed a flexible foam sealing strip in the bellows 2, that is, the seal 4, and insert the PE-RT II pipe and the inner tube 3 into the bellows 2 to complete the combination. Or the PE-RT II pipe material, that is, the inner pipe 3, is inserted into the corrugated pipe 2, and then a small hole is opened on the cladding layer, that is, the outer pipe 1, for casting foamed polyurethane.

4. The connection of the insulation pipe shall be hot-melt connection or electric fusion welding on site, and then covered with insulation material, and then extruded and welded with heat-shrinkable tape or wrapped.

The products produced through the above process are mainly for the secondary heat pipe network after the heat exchange station, and the water temperature is less than 85°C. It can be seen that the heat preservation pipe of the present invention has the advantages of anti-corrosion, heat preservation, high strength and long service life.

The serial numbers of the above-mentioned embodiments of the utility model are only for description, and do not represent the advantages and disadvantages of the embodiments.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (8)

1. A thermal insulation pipe, characterized in that, the thermal insulation pipe is made of plastic material, and the thermal insulation pipe includes an outer tube, a corrugated tube and an inner tube from the outside to the inside, and the outer tube is coated on the corrugated tube. on the pipe, and a first airtight space is formed between the bellows and the outer pipe, the inner pipe is inserted into the bellows, and both ends of the bellows are in contact with the inner pipe. A seal is provided, and the bellows and the inner tube form a second closed space through the seal. 2. The insulation pipe according to claim 1, characterized in that, the materials selected for the bellows and the outer pipe are compatible. 3. The insulation pipe according to claim 1, characterized in that, both the outer pipe and the corrugated pipe are made of high elastic modulus polypropylene material. 4. The insulation pipe according to claim 1, characterized in that, the inner pipe is made of heat-resistant polyethylene II type material. 5. The insulation pipe according to claim 1, characterized in that, the sealing member is a foamed flexible rubber and plastic sealing ring. 6. The insulation pipe according to claim 1, wherein the sealing member is a foamed flexible rubber and plastic sealing strip. 7. The insulation pipe according to claim 1, characterized in that, the sealing member is poured polyurethane foam. 8. The insulation pipe according to any one of claims 1-7, characterized in that, the cross section of the bellows is in the shape of a rectangular tooth.