Vacuum heat insulation pipeline

Abstract

The utility model belongs to the technical field of heat insulation pipes, and relates to a vacuum heat insulation pipeline which comprises an inner pipe and an outer pipe which are coaxially arranged, a closed space is arranged between the inner pipe and the outer pipe, a vacuumizing pipe communicated with the closed space is arranged on the outer pipe, a sealing plug is connected in an opening of the vacuumizing pipe, and the sealing plug is connected with the inner pipe. A push-pull valve is connected to the vacuumizing pipe, and a limiting mechanism is connected between the push-pull valve and the vacuumizing pipe. No heat-conducting medium exists between the inner pipe and the outer pipe in a vacuumizing mode, and the heat insulation effect is ensured. The defects of a traditional polyethylene winding or foam filling heat insulation mode are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of seal ring assembly, and particularly relates to a vacuum insulation pipeline. Background Art

[0002] In the field of central heating, heat insulation treatment is required for pipelines used for medium transportation to ensure the heat insulation performance of the pipelines during the medium transportation process. The existing pipeline heat insulation methods mostly involve winding a polyethylene heat insulation layer outside the pipeline. The polyethylene layer is directly wound and wrapped outside the pipe, and it is prone to breakage and shedding after long-term use, affecting the heat insulation effect. Another method is to fill polyurethane foam between the inner pipe and the outer pipe. Due to the large diameter or long length of the pipe, the polyurethane is prone to uneven foaming during the foaming process, thereby affecting the heat insulation effect. Therefore, the utility model proposes a vacuum insulation pipeline. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a vacuum insulation pipeline, in which there is no heat-conducting medium between the inner pipe and the outer pipe through the vacuum pumping method to ensure the heat insulation effect.

[0004] The utility model realizes the above purpose through the following technical solutions: A vacuum insulation pipeline includes an inner pipe and an outer pipe arranged coaxially. There is a closed space between the inner pipe and the outer pipe. A vacuum pumping pipe communicating with the closed space is provided on the outer pipe. A sealing plug is connected inside the pipe orifice of the vacuum pumping pipe. A push-pull valve is connected to the vacuum pumping pipe, and a limiting mechanism is connected between the push-pull valve and the vacuum pumping pipe.

[0005] Preferably, a retaining ring is provided inside the vacuum pumping pipe. The sealing plug abuts against the retaining ring. Sealing ring mounting grooves are provided on the lower end face and the circumferential surface of the sealing plug, and sealing rings are connected in the sealing ring mounting grooves.

[0006] Preferably, the limiting mechanism includes an annular limiting groove arranged along the outer circumferential surface of the vacuum pumping pipe. The upper and lower sides of the limiting groove are inclined surfaces. An annular thickened portion is provided at the bottom of the push-pull valve. A plurality of radial chutes are provided inside the thickened portion. Limiting balls are provided in the chutes. An opening communicating with the inside of the push-pull valve is provided at one end of the chute. The diameter of the opening is smaller than the diameter of the limiting ball. The limiting ball extends into the limiting groove through the opening. A movable sleeve is provided on the push-pull valve. A push block is fixed at the bottom end of the movable sleeve. The bottom end of the push block movably penetrates into the chute. The side of the push block facing the inside of the push-pull valve abuts against the limiting ball. The bottom end of the push block is an inclined surface facing the inside of the push-pull valve. A spring is sleeved on the push-pull valve. The two ends of the spring are respectively connected to the upper end face of the movable sleeve and the circumferential surface of the push-pull valve. The spring is in a compressed state.

[0007] Preferably, a sealing ring is provided between the contact surfaces of the push-pull valve and the evacuation tube, and the sealing ring is located above the limiting groove.

[0008] The beneficial effect of the technical solution of the present utility model is that there is no heat-conducting medium between the inner tube and the outer tube by means of evacuation, ensuring the heat insulation effect. It avoids the drawbacks of traditional heat insulation methods such as polyethylene winding or foam filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the layout diagram of the vacuum insulation pipeline in the working state of the embodiment.

[0010] Figure 2 It is the schematic structural diagram of the push-pull valve.

[0011] Figure 3 It is the schematic structural diagram of the limiting mechanism.

[0012] The numbers in the figure represent:

[0013] 1, inner tube; 2, outer tube; 3, closed space; 4, evacuation tube; 5, sealing plug; 6, push-pull valve; 7, limiting groove; 8, thickened part; 9, sliding groove; 10, limiting ball; 11, opening; 12, movable sleeve; 13, push block; 14, spring; 15, push rod; 16, evacuation port; 17, pressing cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present utility model will be further described in detail below with reference to specific embodiments.

[0015] Embodiment:

[0016] As Figures 1 to 3 shown, a vacuum insulation pipeline of the present utility model includes an inner tube 1 and an outer tube 2 arranged coaxially. A closed space 3 is provided between the inner tube 1 and the outer tube 2. An evacuation tube 4 communicating with the closed space 3 is provided on the outer tube 2. The outer periphery of the opening 11 of the evacuation tube 4 is chamfered. A sealing plug 5 is connected inside the opening of the evacuation tube 4. A push-pull valve 6 is connected to the evacuation tube 4, and a limiting mechanism is connected between the push-pull valve 6 and the evacuation tube 4.

[0017] A retaining ring is provided inside the evacuation tube 4, and the sealing plug 5 abuts against the retaining ring. Sealing ring mounting grooves are provided on the lower end surface and the circumferential surface of the sealing plug 5, and sealing rings are connected in the sealing ring mounting grooves.

[0018] The limiting mechanism includes an annular limiting groove 7 provided on the outer peripheral surface of the vacuum extraction pipe 4. The upper and lower sides of the limiting groove 7 are inclined surfaces. The bottom of the push-pull valve 6 is provided with an annular thickened portion 8. A plurality of radial sliding grooves 9 are provided in the thickened portion 8. A limiting ball 10 is provided in the sliding groove 9. One end of the sliding groove 9 is provided with an opening 11 communicating with the inner side of the push-pull valve. The diameter of the opening 11 is smaller than the diameter of the limiting ball 10. The limiting ball 10 extends into the limiting groove 7 through the opening 11. An activity sleeve 12 is provided on the push-pull valve 6. A push block 13 is fixed to the bottom end of the activity sleeve 12. The bottom end of the push block 13 movably penetrates into the sliding groove 9. The side of the push block 13 facing the inside of the push-pull valve 6 abuts against the limiting ball 10. The bottom end of the push block 13 is an inclined surface facing the inner side of the push-pull valve 6. A spring 14 is sleeved on the push-pull valve 6. The two ends of the spring 14 are respectively connected to the upper end surface of the activity sleeve 12 and the peripheral surface of the push-pull valve 6. The spring 14 is in a compressed state.

[0019] A sealing ring is provided between the contact surface of the push-pull valve 6 and the vacuum extraction pipe 4. The sealing ring is located above the limiting groove 7.

[0020] The working process of this application is as follows: The sealing plug 5 is inserted and fixed onto the push rod 15 of the push-pull valve 6. The activity sleeve 12 is pushed upward to install the push-pull valve 6 onto the vacuum extraction pipe 4. The limiting ball 10 rolls leftward into the sliding groove 9. After the push-pull valve 6 is installed in place, the activity sleeve 12 is released. The activity sleeve 12 moves downward under the elastic force of the spring 14, and then drives the push block downward. The bottom of the push block 13 pushes the limiting ball 10 to the right. The limiting ball 10 extends into the limiting groove 7. The right side surface of the push block 13 abuts against the limiting ball 10, so that the push-pull valve 6 and the vacuum extraction pipe 4 are fixed. The closed space 3 is evacuated through the vacuum extraction port 16 of the push-pull valve 6 connected to a vacuum pump. After reaching a high vacuum state, the push rod 15 is pressed downward so that the sealing plug 5 blocks the vacuum extraction pipe 4. The activity sleeve 12 is pushed upward to remove the push-pull valve 6 upward. The inclined surface on the lower side of the limiting groove 7 pushes the limiting ball 10 to roll into the sliding groove 9. A pressing cover is also connected to the opening 11 of the vacuum extraction pipe 4. After the push-pull valve 6 is removed, the pressing cover 17 is covered. At this time, an isolated vacuum environment is formed between the inner pipe 1 and the outer pipe 2. When a low-temperature medium flows into the inner pipe 1, since the closed space 3 is in a vacuum, there is no substance to transfer heat. Therefore, heat transfer can be effectively reduced, achieving a good heat insulation effect. And the pipeline can be evacuated again after leakage and used cyclically.

[0021] The above are only some embodiments of the present utility model. For those of ordinary skill in the art, without departing from the creative concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model.

Claims

1. A vacuum insulated pipeline, characterized in that: It comprises an inner tube and an outer tube which are coaxially arranged, a closed space is provided between the inner tube and the outer tube, a vacuum tube which is connected to the closed space is provided on the outer tube, a sealing plug is connected to the pipe mouth of the vacuum tube, a push-pull valve is connected to the vacuum tube, and a limiting mechanism is connected between the push-pull valve and the vacuum tube.

2. The vacuum insulated pipeline according to claim 1, characterized in that: A retaining ring is arranged in the vacuum tube, the sealing plug abuts against the retaining ring, a sealing ring installation groove is arranged on the lower end surface and the peripheral surface of the sealing plug, and a sealing ring is connected in the sealing ring installation groove.

3. The vacuum insulated pipeline according to claim 1, characterized in that: The limit mechanism includes an annular limit groove arranged along the outer circumferential surface of the vacuum tube, the upper and lower sides of the limit groove are set as inclined surfaces, the bottom of the push-pull valve is provided with an annular thickened part, the thickened part is provided with a plurality of sliding grooves along its radial direction, a limit ball is arranged in the sliding groove, one end of the sliding groove is provided with an opening connected to the inner side of the push-pull valve, the diameter of the opening is smaller than the diameter of the limit ball, and the limit ball extends into the limit groove from the opening, the push-pull valve is provided with a movable sleeve, a push block is fixed at the bottom end of the movable sleeve, the bottom end of the push block is movably inserted into the slide groove, the push block faces the push-pull valve The side of the push block is against the limit ball, the bottom end of the push block is set as an inclined surface facing the inner side of the push-pull valve, and a spring is sleeved on the push-pull valve, and the two ends of the spring are respectively connected to the upper end surface of the movable sleeve and the peripheral surface of the push-pull valve, and the spring is in a compressed state.

4. The vacuum insulated pipeline according to claim 3, characterized in that: A sealing ring is provided between the contact surfaces of the push-pull valve and the vacuum tube, and the sealing ring is located above the limiting groove.

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