CN214274755U - Vacuum thermal insulation pipe - Google Patents

Abstract

The application relates to a vacuum insulation pipe, including: the vacuum heat insulation device comprises an outer pipe, an inner pipe and a vacuum heat insulation cavity, wherein the outer pipe is arranged in the outer pipe, and two ends of the inner pipe are respectively fixedly connected with two ends of the outer pipe; an elastic supporting snap ring which is sleeved outside the inner pipe and supported between the outer pipe and the inner pipe is arranged in the vacuum heat insulation cavity. The vacuum heat-insulating pipe has excellent and stable heat-insulating performance.

Description

Vacuum thermal insulation pipe

Technical Field

The application relates to a vacuum insulation pipe.

Background

A heat-insulating water pipe is widely used as a hot water supply pipe in household water and house heating. In order to ensure the hot water supply efficiency and reduce energy consumption, the heat-insulating water pipe needs to have better heat-insulating performance so as to reduce the heat loss of hot water in the hot water supply pipe, improve the heat supply efficiency and reduce the heat supply cost.

The traditional heat-insulating water pipe is usually made of heat-insulating materials with low heat conductivity coefficient, particularly heat-insulating plastics, and the heat-insulating performance of the plastic heat-insulating water pipe is far smaller than that of a vacuum heat-insulating structure. And the bearing capacity of the plastic pipe is far smaller than that of the metal pipe.

Vacuum insulation cups and vacuum insulation tanks are very common in the market, but water pipes or air pipes of vacuum insulation structures cannot be popular in the market, and one reason is that: the length-diameter ratio of the pipe is far greater than that of the vacuum cup and the heat preservation tank, if the inner pipe and the outer pipe of the vacuum heat preservation pipe are only fixed at two ends, when the vacuum heat preservation pipe is large in length and filled with fluid in the pipe, the inner pipe is easy to bend downwards and deform under the action of self gravity and internal fluid gravity. The bending deformation not only can cause the deformation of the whole vacuum insulation pipe, but also can easily cause the large-area contact between the inner pipe and the outer pipe, thereby reducing the heat insulation capacity of the vacuum insulation pipe.

Disclosure of Invention

The technical problem that this application will solve is: in view of the above problems, a vacuum insulation pipe having excellent and stable insulation performance is proposed.

The technical scheme of the application is as follows:

a vacuum insulated pipe comprising:

an outer tube having a first end and a second end,

an inner tube disposed inside the outer tube and having both ends fixedly connected to both ends of the outer tube, respectively, and

and a vacuum insulation chamber formed between the outer tube and the inner tube;

an elastic supporting snap ring which is sleeved outside the inner pipe and supported between the outer pipe and the inner pipe is arranged in the vacuum heat insulation cavity.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the elastic support snap ring includes:

an annular snap ring body is arranged on the outer side of the clamping ring,

at least two inner pipe supporting bulges which are arranged on the snap ring body and are inwards convex in the radial direction, and

at least two outer tube supporting bulges which are arranged on the snap ring body and protrude outwards in the radial direction;

the at least two inner pipe supporting protrusions are arranged at intervals along the circumferential direction of the snap ring body, and the at least two outer pipe supporting protrusions are arranged at intervals along the circumferential direction of the snap ring body;

the inner tube support protrusion abuts the outer surface of the inner tube, and the outer tube support protrusion abuts the inner surface of the outer tube.

The inner pipe supporting bulge and the outer pipe supporting bulge are both bent bulges integrally formed on the snap ring body.

The snap ring body is made of steel.

The elastic support clamping ring is of an integral injection molding structure.

The inner tube support protrusion is in linear contact with an outer surface of the inner tube, and the outer tube support protrusion is in linear contact with an inner surface of the outer tube.

The pipe wall of the inner pipe is provided with an annular bulge which protrudes outwards in the radial direction and surrounds the periphery of the axis of the inner pipe, the inner pipe supporting bulge is provided with a limit groove, and the annular bulge is embedded into the limit groove.

The snap ring body includes:

a left ring body and a right ring body arranged at an interval in a length direction of the inner tube, an

A connector connecting the left ring body and the right ring body.

The limiting groove is formed on the connecting body.

The spacing gap between the left ring body and the right ring body forms the limiting groove.

The beneficial effect of this application:

1. this application has set up in the thermal-insulated chamber of vacuum insulation pipe and has supported the elastic support snap ring between outer tube and inner tube for the thermal-insulated chamber structure of vacuum between inner tube and the outer tube keeps stable, effectively avoids inner tube or outer tube atress crooked and paste each other and lean on the thermal insulation performance who causes and reduce.

2. The vacuum heat insulation cavity between the inner pipe and the outer pipe is supported by the elastic piece, so that the inner pipe and the outer pipe are easier to install and remove, and the elastic support snap ring can better adapt to the bending deformation of the inner pipe and the outer pipe.

3. The outer surface linear contact of inner tube support arch and inner tube, outer tube support arch and outer tube has effectively reduced elastic support snap ring and inner tube and outer tube heat conduction area of contact.

4. The elastic support clamping ring is formed by bending and processing a stainless steel ring or integrally injection molding high polymer plastics, and is convenient to manufacture and low in cost.

5. The outer cladding of elastic support snap ring is thermal-insulated rubber, when reducing inner tube and outer tube and passing through the heat transfer of elastic support snap ring, and soft thermal-insulated rubber still has the guard action to the internal surface of inner tube and the internal surface of outer tube, avoids inner tube and outer tube to be by the snap ring fish tail.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description only relate to some embodiments of the present application and are not limiting on the present application.

Fig. 1 is a schematic perspective view of a vacuum insulation tube according to an embodiment of the present application.

FIG. 2 is an axial cross-sectional view of a vacuum insulation pipe according to an embodiment of the present invention.

FIG. 3 is a radial cross-sectional view of a vacuum insulation pipe according to an embodiment of the present invention.

Fig. 4 is a schematic perspective view of an elastically supporting snap ring according to an embodiment of the present disclosure.

Fig. 5 is a schematic illustration of the butt joint of two vacuum tubes in the first embodiment of the present application.

FIG. 6 is a cross-sectional view of the interface of two vacuum tubes of FIG. 5.

Fig. 7 is a schematic perspective view of the vacuum insulation pipe in the first embodiment of the present application when the screw sleeve slides to the middle of the pipe section.

FIG. 8 is an axial sectional view of a vacuum insulation pipe according to the second embodiment of the present application.

FIG. 9 is an axial sectional view of a vacuum insulation pipe according to the third embodiment of the present application.

FIG. 10 is a perspective view of a vacuum insulation pipe according to the fourth embodiment of the present application.

FIG. 11 is a schematic view of a first butt joint of two vacuum tubes in the fourth embodiment of the present application.

Fig. 12 is an enlarged view of the joint of two vacuum tubes of fig. 10.

FIG. 13 is a schematic view of a second embodiment of the present invention showing two vacuum tubes in a fourth embodiment.

Fig. 14 is a partial structural cross-sectional view of fig. 13.

Fig. 15 is an exploded view of the thermal jacket of fig. 13.

Fig. 16 is a schematic structural view of the hoop in fig. 13.

FIG. 17 is a third schematic illustration of the docking of two vacuum tubes in the fourth embodiment of the present application.

Fig. 18 is a schematic structural diagram of the snap spring in fig. 17.

Fig. 19 is a schematic perspective view of a vacuum insulation tube according to a fifth embodiment of the present application.

FIG. 20 is a schematic illustration of the butt joint of two vacuum tubes in the fifth embodiment of the present application.

FIG. 21 is a sectional view of the interface of two vacuum tubes of FIG. 20.

FIG. 22 is a schematic view showing the internal structure of a vacuum insulation pipe according to the sixth embodiment of the present application.

Fig. 23 is a schematic structural view of a resiliently supported snap ring in a sixth embodiment of the present application.

FIG. 24 is a schematic view showing the internal structure of a vacuum insulation pipe according to the seventh embodiment of the present application.

Fig. 25 is a schematic structural view of a spring-loaded snap ring according to a seventh embodiment of the present disclosure.

FIG. 26 is a schematic view showing an internal structure of a vacuum insulation pipe according to an eighth embodiment of the present application.

Fig. 27 is a schematic structural view of an elastically supporting snap ring in an eighth embodiment of the present application.

FIG. 28 is a schematic view showing the internal structure of a vacuum insulation pipe in the ninth embodiment of the present application.

Fig. 29 is a schematic structural view of an elastic support snap ring in the ninth embodiment of the present application.

FIG. 30 is a sectional view of a vacuum insulation pipe according to a tenth embodiment of the present application.

Fig. 31 is an enlarged view of the X1 portion of fig. 30.

Fig. 32 is a schematic perspective view of a support ring according to an embodiment of the present application.

FIG. 33 is a perspective view of a ten-step hoop according to an embodiment of the present application.

FIG. 34 is a sectional view of an eleventh vacuum insulation pipe according to the present application.

Fig. 35 is an enlarged view of the X2 portion of fig. 34.

Fig. 36 is a schematic perspective view of an eleventh embodiment of a hinge of the present application.

FIG. 37 is a perspective view of a hoop in accordance with an eleventh embodiment of the present application.

Wherein:

1-outer pipe, 2-inner pipe, 3-vacuum heat insulation cavity, 4-elastic support snap ring, 5-hoop ring, 6-support ring, 7-stud, 8-annular outer flange, 9-thread sleeve, 10-sealing washer, 11-connecting flange, 12-bolt, 13-nut, 14-hoop, 15-insulating sleeve, 16-sealing washer and 17-snap spring;

101-second deformed fold, 201-deformed fold, 4 a-left ring body, 4 b-right ring body, 4 c-connecting body, 401-inner pipe supporting protrusion, 401 a-limiting groove, 402-outer pipe supporting protrusion, 501-hoop reinforcing rib, 601-hoop reinforcing rib, 602-extrusion ring groove, 901-annular inner flange, 1501-sleeve body 1501 a-tongue, 1501 b-tongue groove and 1501 c-sealing ring embedding groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" or "an" and the like in the description and in the claims of the present application do not denote a limitation of quantity, but rather denote the presence of at least one.

In the description of the present specification and claims, the terms "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

Specific embodiments of the present application will now be described with reference to the accompanying drawings.

The first embodiment is as follows:

fig. 1 and 2 show an embodiment of the vacuum insulation pipe of the present application, which includes an outer pipe 1, an inner pipe 2 disposed inside the outer pipe, and a vacuum insulation chamber 3 formed between the outer pipe and the inner pipe. Two ends of the inner tube 2 are fixedly connected with two ends of the outer tube 1.

If the vacuum insulation pipe is used for conveying high-temperature fluid, the temperature is higher because the inner pipe 2 is in direct contact with the fluid. Since the vacuum heat insulating chamber 3 having excellent heat insulating performance is provided between the inner tube and the outer tube, heat of the inner tube 2 is hardly transferred to the outer tube 1, and the temperature of the inner tube 2 is much higher than that of the outer tube 1. In practical applications, the temperature of the fluid in the inner tube 2 changes frequently, and the fluid in the tube is interrupted, which results in a temperature change range of the inner tube 2 of up to one hundred or even several hundred degrees celsius. The dimensions of the inner tube 2 at high and low temperatures, particularly its axial dimension, are significantly different depending on expansion and contraction with heat. The outer pipe 1, which is located at the periphery of the inner pipe 2, is not affected by the temperature of the fluid inside and is maintained at a substantially constant value, so that the outer pipe 1 is not significantly deformed. The large-size deformation of the inner pipe 2 not only causes the integral kinking deformation of the vacuum heat-insulating pipe, but also can cause the problems that the sealing structure at the joint of the inner pipe and the outer pipe is damaged and the vacuum heat-insulating cavity leaks air.

The above problems are also present if the vacuum insulated pipe is used for transporting ultra-low temperature fluids, such as liquefied natural gas. The above problems are further highlighted when the vacuum insulation pipe is used for transporting both high temperature fluid and low temperature fluid.

In view of the above, the present embodiment integrally provides the deformed annular wrinkles 201 on the outer periphery of the inner pipe axis on the pipe wall of the inner pipe 2. The deformed pleats 201 are a portion of the wall of the inner tube 2.

When the temperature of the inner pipe 2 rises, the deformation wrinkles 201 on the pipe wall of the inner pipe shrink to absorb the expansion deformation of the inner pipe, thereby preventing the expansion stress of the inner pipe from concentrating on the joint of the inner pipe and the outer pipe to cause the deformation of the vacuum insulation pipe and even the air leakage of the vacuum insulation cavity. When the temperature of the inner pipe 2 is reduced, the deformation wrinkles 201 on the pipe wall of the inner pipe stretch to compensate the shrinkage deformation of the inner pipe, and the phenomenon that the shrinkage stress of the inner pipe is concentrated at the joint of the inner pipe and the outer pipe to cause the deformation of the vacuum heat-insulating pipe and even the air leakage of the vacuum heat-insulating cavity is also avoided.

When the length of the vacuum insulation pipe is large, it is difficult to completely absorb/release the expansion deformation of the inner pipe by only providing one deformation fold 201 on the inner pipe 2, so the present embodiment provides a plurality of deformation folds 201 on the pipe wall of the inner pipe 2, and the deformation folds 201 are arranged at equal intervals along the length direction of the inner pipe 2.

Further, the deformed corrugation 201 is an annular protrusion protruding inward in the radial direction, and a ring of annular groove is formed on the periphery of the annular protrusion.

When the temperature of the inner tube 2 is high or the fluid pressure inside the inner tube is high, radial deformation expanding outwards is generated, and what is more, the periphery of the inner tube 2 is a vacuum environment with low pressure. If the expansion deformation is too large, the inner pipe 2 is attached to the outer pipe 1 in a large area, so that heat is rapidly transferred between the inner pipe and the outer pipe, and the heat insulation performance of the vacuum heat-insulation pipe is remarkably reduced. Based on this, the present embodiment provides the hoop 5 hooped around the outer periphery of the inner tube 2 to hoop the inner tube 2 when the inner tube 2 expands radially outward, so as to reduce the outward expansion deformation of the inner tube 2 and improve the pressure resistance of the inner tube 2.

The hoop 5 is made of high-strength steel and has high bearing capacity.

Further, the present embodiment inserts the hoop 5 into the annular groove around the deformed corrugation 201 to define the position of the hoop 5 by the annular groove, so as to prevent the hoop 5 from moving on the inner pipe 2. It should be noted that if we directly machine the annular groove on the outer surface of the inner pipe 2, the hoop 5 can be embedded in the annular groove to fix the position of the hoop 5 even if no deformation wrinkle is formed at the annular groove.

Of course, we can also arrange the hoop 5 in a non-grooved position of the inner tube 2. In this case, the hoop 5 is preferably adhesively fixed to the inner pipe 2 by means of an adhesive to prevent the hoop from moving.

In this embodiment, the inner tube 2 and the outer tube 1 are both metal tubes, preferably copper tubes, aluminum tubes or steel tubes. The annular bulge is an extrusion convex rib formed by extruding on the pipe wall of the inner pipe 2, and can be manufactured before or after the inner pipe is formed. It is understood that the annular extruded rib integrally formed on the wall of the inner tube 2 is of a bent structure, and compared with the smooth main body part of the metal inner tube 2, the extruded rib of the bent structure has better stretching/shrinking deformation capability.

If the inner tube 2 and the outer tube 1 are fixed only at two ends, when the vacuum insulation tube is long and the tube is filled with fluid, the inner tube 2 is easy to bend and deform downwards under the action of self gravity and internal fluid gravity. The bending deformation of the inner pipe 2 not only can cause the deformation of the whole vacuum insulation pipe, but also can easily cause the large-area sticking of the inner pipe and the outer pipe, thereby reducing the heat insulation capacity of the vacuum insulation pipe. In view of this, in the present embodiment, an elastic support ring 4 is provided in the vacuum insulation chamber 3, which is sleeved outside the inner tube and supported between the outer tube 1 and the inner tube 2.

As shown in fig. 3 and 4, the elastic support snap ring 4 includes an annular (not limited to a circular ring) snap ring body, three inner tube support protrusions 401 disposed on the snap ring body and protruding inward in the radial direction, and three outer tube support protrusions 402 disposed on the snap ring body and protruding outward in the radial direction. The three inner tube supporting protrusions 401 are uniformly spaced along the circumferential direction of the snap ring body, and the three outer tube supporting protrusions 402 are also uniformly spaced along the circumferential direction of the snap ring body. Each inner tube support protrusion 401 abuts the outer surface (elasticity) of the inner tube 2, and each outer tube support protrusion 402 abuts the inner surface (elasticity) of the outer tube 1.

It is advantageous that the vacuum chamber between the inner tube 2 and the outer tube 1 is supported by elastic members rather than rigid members: the elastic support snap ring 4 is easier to install and remove. The elastic support snap ring 4 can better adapt to the small-size bending deformation of the inner tube 2 or the outer tube 1.

If the contact areas of the inner pipe support protrusions 401 and the inner pipe 2 and the outer pipe support protrusions 402 and the outer pipe 1 are large, heat is rapidly transferred between the inner pipe and the outer pipe, resulting in a significant decrease in the thermal insulation performance of the vacuum hose. Based on this, we can rationally arrange the structures of the inner tube supporting projections 401 and the outer tube supporting projections 402 such that the inner tube supporting projections 401 are in linear contact with the outer surface of the inner tube 2 and the outer tube supporting projections 402 are in linear contact with the inner surface of the outer tube 1.

In this embodiment, the elastic support snap ring 4 is an integral structure processed by using a stainless steel sheet as a raw material, and the inner tube support protrusion 401 and the outer tube support protrusion 402 are both upper bending protrusions integrally formed on the snap ring body.

The stainless steel has a high thermal conductivity, and in order to avoid rapid heat transfer between the inner tube 2 and the outer tube 1 through the elastic support snap ring 4, a layer of heat-insulating rubber can be coated outside the elastic support snap ring 4. Moreover, the soft heat insulation rubber has a protection effect on the inner surface of the inner pipe 2 and the inner surface of the outer pipe 1, and the inner pipe and the outer pipe are prevented from being scratched by clamping rings.

Of course, the elastic support snap ring 4 may also be made of an integral injection molding structure made of a high polymer material, and has better heat insulation performance compared with stainless steel.

When the length of the vacuum insulation pipe is large, it is obviously insufficient to provide only one elastic support snap ring 4. Based on this, a plurality of elastic supporting snap rings 4 are arranged in total in the present embodiment, and the elastic supporting snap rings 4 are arranged at intervals along the length direction of the vacuum insulation pipe.

In addition, in order to facilitate the quick connection between the vacuum insulation pipe and the vacuum insulation pipe, in this embodiment, a stud 7 is disposed at one end of the vacuum insulation pipe, and a ring of radially outward protruding annular outer flange 8 is disposed at the other end of the vacuum insulation pipe. Referring to fig. 5 and 6, in practical application, the external annular flange 8 at the right end of the left vacuum insulation pipe is aligned with the stud 7 at the left end of the right vacuum insulation pipe, and a sealing washer 10 is clamped between the two. The threaded sleeve 9 sleeved on the left vacuum heat-insulating pipe is in threaded connection with the stud 7 at the left end part of the right vacuum heat-insulating pipe, and the annular inner flange 901 integrally arranged at the left end part of the threaded sleeve 9 tightly abuts against one side of the annular outer flange 8, so that the quick sealing butt joint of the left vacuum heat-insulating pipe and the right vacuum heat-insulating pipe is realized.

When the vacuum insulation pipe is manufactured, the screw sleeve 9 with the annular inner flange 901 is sleeved outside the vacuum insulation pipe, and then the stud 7 or the annular outer flange 8 is installed.

Example two:

fig. 8 shows a second embodiment of the vacuum insulation tube of the present application, which has substantially the same structure as the first embodiment except that:

in this embodiment, the deformed wrinkles 201 on the inner tube 2 are not annular protrusions protruding radially inward, but annular protrusions protruding radially outward, and a ring of annular grooves are formed on the inner circumference of the annular protrusions protruding radially outward.

This is because: in the first embodiment, the deformed wrinkles 201 on the inner tube 2 are inward convex in the radial direction, so that the flow area of the deformed wrinkles 201 is reduced, and the flow resistance is increased. The deformed folds 201 on the inner tube 2 are radially outwardly convex in this embodiment, eliminating the aforementioned drawbacks.

Since the deformed folds 201 on the inner tube 2 are radially inwardly convex instead of radially outwardly convex in the first embodiment, the corresponding annular grooves are no longer located on the outer periphery of the annular projection but on the inner periphery of the annular projection. The annular groove of the inner periphery obviously cannot be used to limit the position of the hoop 5, and the hoop 5 cannot be arranged further around the deformed pleat 201. Therefore, in the present embodiment, the hoop 5 is directly sleeved on the smooth main pipe section of the inner pipe 2.

Example three:

fig. 9 shows a third embodiment of the vacuum insulation tube of the present application, which has substantially the same structure as the first embodiment except that: the present embodiment integrally provides annular deformed wrinkles around the outer tube axis on the tube wall of the outer tube 1, and for convenience of description, the deformed wrinkles on the outer tube 1 are referred to as second deformed wrinkles 101.

As mentioned above, the inner tube 2 is elongated or contracted when the temperature is changed. In this embodiment, on the basis of the first embodiment, the second deforming folds 101 surrounding the outer tube axis are integrally arranged on the tube wall of the outer tube 1, so that the outer tube 1 can adapt to the extension and contraction deformation of the inner tube 2 well, and the possibility of the vacuum insulation tube being distorted or leaking gas during temperature change is further reduced.

The second deformed wrinkles 101 are also provided in plural, and each of the second deformed wrinkles is arranged at equal intervals along the length direction of the outer tube 1.

In this embodiment, the second deformed corrugation 101 is a radially outwardly convex annular protrusion, and an inner circumference of the annular protrusion forms a ring of annular grooves. Further, the annular protrusion as the second deformed corrugation 101 is specifically an extruded bead integrally formed on the tube wall of the outer tube 1.

If the diameter of the vacuum heat-insulating pipe reaches more than one meter, the outer pipe 1 is very easy to be inwards sunken and deformed under the action of external force (the inner side of the outer pipe 1 is a negative pressure environment in any situation), and then the outer pipe 1 is in large-area contact with the inner pipe 2, so that heat is rapidly transferred between the inner pipe and the outer pipe, and the heat-insulating performance of the vacuum heat-insulating pipe is reduced. Although increasing the thickness of the outer tube 1 can solve the above problems well, it brings with it various problems such as more material, high manufacturing cost, heavy product, and difficulty in moving and installing. In view of this, the embodiment abandons the scheme of thickening the tube wall of the outer tube, but arranges a support ring supported on the inner circumference of the outer tube in the vacuum heat insulation cavity 3 to support the outer tube when the outer tube is inward concaved, so as to improve the deformation resistance of the outer tube.

Further, the present embodiment fits the above-mentioned brace ring 6 in the annular groove on the inner periphery of the second deformed pleat 101 to define the position of the brace ring 6 by the annular groove, preventing the brace ring 6 from moving in the outer tube 1. It should be noted that if we directly machine the annular groove on the inner surface of the outer tube 1, even if the second deformed corrugation is not formed at the annular groove, the support ring 6 can still be embedded in the annular groove to fix the position of the support ring 6.

Of course, it is also possible to arrange the brace ring 6 in a non-recessed position of the outer tube 1. In this case, the ring 6 is preferably adhesively fixed to the outer tube 1 by means of an adhesive to prevent the ring from moving.

The support ring 6 is also made of high-strength steel and has high pressure-bearing capacity.

In the present embodiment, the inner pipe 2 and the outer pipe 1 are both circular steel pipes, and the hoop 5 and the brace 6 are both circular rings. The hoops 5 are arranged equidistantly along the length of the inner pipe 2 and the braces 6 are arranged equidistantly along the length of the outer pipe 1.

It should be noted that, because the inner tube 2 and the outer tube 1 are fixedly connected at two end positions, and the tube wall of the inner tube has a deformed wrinkle structure, even if no deformed wrinkle is arranged on the outer tube 1, the vacuum insulation tube has very little destructive deformation caused by temperature change. Similarly, if the deformation fold structure is only arranged on the pipe wall of the outer pipe, even if the deformation fold structure is not arranged on the pipe wall of the inner pipe, the destructive deformation of the vacuum heat-insulating pipe caused by the temperature change is very little.

Example four:

fig. 10 shows a fourth embodiment of the vacuum insulation pipe of the present application, which has a structure substantially the same as that of the first embodiment except that: in this embodiment, two ends of the vacuum heat-insulating pipe are respectively provided with a connecting flange 11, and the connecting flange 11 is utilized to realize the rapid butt joint of the vacuum heat-insulating pipe and the vacuum heat-insulating pipe, without adopting the stud and the annular outer flange in the first embodiment.

As shown in fig. 11 and 12, in practical use, the connecting flange 11 at the right end of the left vacuum insulation pipe is aligned with the connecting flange 11 at the left end of the right vacuum insulation pipe, and a sealing gasket 10 is interposed between the two connecting flanges 11. Bolts 12 are sequentially passed through bolt holes of the two connecting flanges 11 and locked with nuts 13.

The joint of the two vacuum insulation pipes in fig. 11 and 12 has no vacuum insulation structure, and is a weak insulation part of the pipeline system. In order to improve the heat preservation capability of the joint of the two vacuum heat preservation pipes, as shown in fig. 13 to fig. 15, the joint of the two pipes is wrapped by a heat preservation sleeve 15 in the embodiment.

The insulating sheath 15 is formed by abutting two semi-annular sheath bodies 1501, and both sheath bodies 1501 are made of polyurethane foam.

In order to facilitate the butt joint and fixation of the two sleeves 1501, a tongue 1501a and a groove 1501b are respectively disposed at two ends of each sleeve 1501. During assembly, the tongues 1501a of the covers 1501 are coated with adhesive, and then the tongues of the covers are inserted into the grooves 1501b of the other cover 1501, so that the two covers 1501 are butted and fixed to each other.

By merely the mating of the tongue 1501a and groove 1501b and the adhesive force of the adhesive, the possibility of two sets of bodies separating from each other still exists. For this reason, the present embodiment is provided with a hoop 14 for hooping the two sleeves together on the periphery of the thermal insulation sleeve 15.

We can replace the above mentioned anchor ear 14 with an elastic snap spring 17, as shown in fig. 17 and 18, the snap spring 17 is more convenient to install and remove than the anchor ear 14 with bolt for adjusting tightness. Of course, other fasteners such as ties, wires, etc. may be used to reinforce the connection between the two half rings 1501.

In order to improve the sealing performance between the thermal insulation sleeve 15 and the vacuum thermal insulation pipe and prevent water from entering a gap between the thermal insulation sleeve 15 and the vacuum thermal insulation pipe, the vacuum thermal insulation pipe is sleeved with a sealing ring 16 made of rubber material and clamped between the thermal insulation sleeve 15 and the vacuum thermal insulation pipe.

Further, a seal ring groove 1501c is formed on the inner surface of the housing 1501, and the seal ring 16 is fitted into the seal ring groove 1501c after the assembly is completed.

Example five:

fig. 19 shows a fifth embodiment of the vacuum insulation pipe of the present application, which has a structure substantially the same as that of the first embodiment except that: in the embodiment, a circle of annular outer flanges 8 which protrude outwards in the radial direction are respectively arranged at two ends of the vacuum heat-insulating pipe, and the stud 7 at the other end of the vacuum heat-insulating pipe is replaced by the annular outer flange 8.

In practice, as shown in fig. 20 and 21, the external annular flange 8 at the right end of the left vacuum holding tube is aligned with the external annular flange 8 at the left end of the right vacuum holding tube, and a sealing gasket is interposed between the two external annular flanges 8. Then the left and the right vacuum heat preservation pipes are in sealing butt joint by using the hoop 14 which is held at the periphery of the two annular outer flanges 8. The hoop 14 in this embodiment is different from the hoop structure for hooping the thermal insulation jacket in the fourth embodiment.

Example six:

the vacuum insulation pipe of the embodiment has basically the same structure as the second embodiment, and the main difference lies in the structure and the installation position of the elastic support snap ring 4:

as shown in fig. 22 and 23, in the present embodiment, each inner tube support protrusion 401 of the elastic support collar 4 is provided with a limiting groove 401a, and a convex annular protrusion on the inner tube 2 is inserted into the limiting groove 401a to define the axial position of the elastic support collar 4 in the vacuum insulation tube, so as to prevent the elastic support collar 4 from moving along the length direction of the inner tube 2.

Thanks to the elastic deformation characteristic of the elastic support snap ring 4, people can very conveniently install the elastic support snap ring 4 between the inner pipe and the outer pipe, and the limit groove 401a on the snap ring and the convex annular bulge on the inner pipe are mutually embedded in place.

It should be noted that, in some other embodiments of the present application, even if the annular protrusion provided on the wall of the inner tube 2 does not have the ability to absorb deformation, the annular protrusion does not interfere with the cooperation of the annular protrusion and the limiting groove 401a on the inner tube supporting protrusion 401 to limit the axial position of the elastic supporting snap ring 4. That is, in defining the axial position of the elastic support snap ring 4 with the stopper groove 401a by the annular projection of the inner tube 2, it is not required that the annular projection be a deformed wrinkle capable of absorbing deformation, and it may be a circular ring bonded or welded to the outer periphery of the inner tube.

Example seven:

referring to fig. 24 and 25, the vacuum insulation pipe of the present embodiment has substantially the same structure as the sixth embodiment, except for the specific structure of the elastic support snap ring 4:

in the present embodiment, the snap ring body that elastically supports the snap ring 4 is constituted by the left ring body 4a, the right ring body 4b, and the connecting body 4 c. The left ring body 4a and the right ring body 4b are spaced apart from each other in the longitudinal direction of the inner tube 2, and the connecting body 4c is integrally connected between the left ring body 4a and the right ring body 4 b.

Further, the inner tube supporting projection 401 is formed in part on the left ring body 4a, in part on the right ring body 4b, and in part on the connecting body 4 c. A stopper groove 401a of the inner tube supporting projection 401 is formed in the connecting body 4 c.

Example eight:

referring to fig. 26 and 27, the vacuum insulation pipe of the present embodiment has a structure substantially the same as that of the seventh embodiment, and a retainer ring body elastically supporting the retainer ring 4 is also composed of a left ring body 4a and a right ring body 4b arranged at a distance from each other and a connecting body 4c fixedly connecting the left ring body and the right ring body. The difference lies in that:

in this embodiment, the connecting body 4c is provided not at the inner tube supporting projection 401 but at the outer tube supporting projection 402. The spacing gap between the left ring body 4a and the right ring body 4b forms a limiting groove 401 a.

Example nine:

referring to fig. 28 and 29, the vacuum insulation pipe of the present embodiment has the most similar structure to that of the sixth embodiment, and the main difference is that:

the elastic support snap ring 4 in the sixth embodiment is a ring-sheet structure, and the limiting groove 401a on the elastic support snap ring has a certain length dimension. The elastic support collar 4 in the ninth embodiment is an annular steel wire structure with a circular cross section, the limiting groove 401a (and the inner tube support protrusion 401 and the outer tube support protrusion 402) is formed by bending the steel wire, and the length of the limiting groove 401a is almost zero.

Example ten:

fig. 30 shows a tenth embodiment of the vacuum insulation tube of the present application, which has substantially the same structure as the second embodiment, with the main difference:

in this embodiment, the hoop 5 is integrally provided with an annular hoop reinforcement rib 501 which is located on the outer periphery of the hoop and is arranged coaxially with the hoop, as shown in fig. 31 and 33. The hoop reinforcement 501 is a pressing protrusion formed by pressing the hoop 5, and a pressing ring groove is formed on the inner circumference of the pressing protrusion. Compared with the hoop in the second embodiment, the hoop 5 with the reinforcing ribs on the inner periphery has higher pressure bearing capacity.

In the present embodiment, as in the third embodiment, a plurality of stay rings 6 are supported and provided on the inner periphery of the outer tube 1. In contrast, in order to increase the pressure-bearing capacity of the brace ring 6, in the present embodiment, an annular brace ring rib 601, which is located on the inner periphery of the hoop and is arranged coaxially with the brace ring, is integrally provided on the brace ring 6, as shown in fig. 31 and 32. The hoop reinforcement 601 is a pressing projection formed by pressing the hoop 6, and a pressing ring groove 602 is formed on the outer periphery of the pressing projection.

Moreover, the stay rings 6 of the present embodiment are provided in plural, each stay ring 6 having a larger axial dimension than that of the first embodiment, and the stay rings 6 are arranged next to each other in the axial direction of the outer tube 1. These bracing rings 6, which are arranged next to one another, are wrapped around the outer tube 1 and the outer tube 1 serves primarily as a sealing and as a bracing ring.

Example eleven:

fig. 34 shows an eleventh embodiment of a vacuum insulation tube of the present application, which has substantially the same structure as the tenth embodiment except that:

in this embodiment, the ring rib 601 of the ring 6 is not an extrusion protrusion with a ring groove on the back side, but a ring rib directly formed on the inner periphery thereof when the ring is die-cast, as shown in fig. 35 and 36.

The hoop reinforcement 501 on the hoop 5 is no longer a rear-side extruded projection with a circumferential groove, but rather a circumferential rib formed directly on the outer circumference of the hoop 5 during the injection molding thereof, as shown in fig. 35 and 37.

Since the supporting ring 6 and the hoop 5 of the above-mentioned tenth and eleventh embodiments are provided with the outwardly convex annular reinforcing ribs, the elastic support snap ring 4 is difficult to be installed in the vacuum insulation chamber, and therefore, the elastic support snap ring 4 is preferably not provided in the above-mentioned tenth and eleventh embodiments.

Claims (10)

1. A vacuum insulated pipe comprising:

an outer tube (1),

an inner tube (2) arranged inside the outer tube and having two ends respectively fixedly connected with two ends of the outer tube, and

and a vacuum insulation chamber (3) formed between the outer tube and the inner tube;

the vacuum heat insulation device is characterized in that an elastic support snap ring (4) which is sleeved outside the inner pipe and supported between the outer pipe (1) and the inner pipe (2) is arranged in the vacuum heat insulation cavity (3).

2. Vacuum insulation pipe according to claim 1, characterized in that the resilient support collar (4) comprises:

an annular snap ring body is arranged on the outer side of the clamping ring,

at least two inner tube supporting protrusions (401) arranged on the snap ring body and protruding inwards in the radial direction, and

at least two outer tube support protrusions (402) arranged on the snap ring body and protruding outwards in the radial direction;

the at least two inner pipe supporting protrusions (401) are arranged at intervals along the circumferential direction of the snap ring body, and the at least two outer pipe supporting protrusions (402) are arranged at intervals along the circumferential direction of the snap ring body;

the inner tube support protrusion (401) abuts the outer surface of the inner tube (2), and the outer tube support protrusion (402) abuts the inner surface of the outer tube (1).

3. The vacuum insulation pipe according to claim 2, wherein the inner pipe support protrusion (401) and the outer pipe support protrusion (402) are both bent protrusions integrally formed on the snap ring body.

4. The vacuum insulated pipe of claim 3, wherein the snap ring body is made of steel.

5. Vacuum insulation pipe according to claim 2, characterized in that the resilient support collar (4) is of a one-piece injection molded construction.

6. The vacuum insulation pipe according to claim 2, wherein the inner pipe support protrusion (401) is in linear contact with an outer surface of the inner pipe (2), and the outer pipe support protrusion (402) is in linear contact with an inner surface of the outer pipe (1).

7. The vacuum heat-insulating pipe according to claim 2, characterized in that the pipe wall of the inner pipe (2) is provided with an annular protrusion which protrudes radially outwards and surrounds the periphery of the axis of the inner pipe, the inner pipe supporting protrusion (401) is provided with a limiting groove (401 a), and the annular protrusion is embedded in the limiting groove (401 a).

8. The vacuum insulated pipe of claim 7, wherein the snap ring body comprises:

a left ring body (4 a) and a right ring body (4 b) which are arranged at intervals in the length direction of the inner pipe (2), an

A connector (4 c) connecting the left ring body and the right ring body.

9. The vacuum insulation pipe according to claim 8, wherein the stopper groove (401 a) is formed on the connecting body (4 c).

10. The vacuum insulation pipe according to claim 8, wherein the spacing gap between the left ring body (4 a) and the right ring body (4 b) forms the limiting groove (401 a).

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