Composite vacuum metal hose

Abstract

The invention discloses a composite vacuum metal hose, and relates to the technical field of vacuum metal hoses. The composite vacuum metal hose comprises an outer-layer corrugated pipe, wherein the two ends of the outer-layer corrugated pipe are connected with outer-layer connecting pipes; the first sliding sleeve and the second sliding sleeve can dynamically adjust the pressure borne by the inner-layer corrugated pipe when a fluid medium passes through the inner-layer corrugated pipe, so that the inner-layer corrugated pipe is prevented from being excessively stretched and extruded, and the resistance of the fluid medium passing through the inner-layer corrugated pipe is further reduced; a fluid medium smoothly enters the inner-layer corrugated pipe, the impact on the inner-layer corrugated pipe is reduced, the adjusting area can automatically and adaptively change according to the pressure of the fluid medium to weaken the pressure brought by the fluid medium entering the inner-layer corrugated pipe, the impact on the inner-layer corrugated pipe by the fluid medium is reduced, meanwhile, the resistance of the fluid medium is reduced, and the service life of the inner-layer corrugated pipe is prolonged. The speed of the fluid medium penetrating through the inner-layer corrugated pipe is increased, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum metal hoses, and more specifically, relates to a composite vacuum metal hose. Background Art

[0002] A vacuum metal bellows is a specially designed pipe element. Its axisymmetric structure and corrugated shape endow it with a certain degree of bendability. The inner diameter of the existing vacuum bellows is usually corrugated, presenting unevenness on the cross-section. This causes that when a fluid medium passes through the vacuum bellows, the fluid medium will be blocked by the uneven inner diameter, resulting in a large impact on the vacuum bellows. This will cause a large thrust of the fluid medium on the front end in the moving direction of the fluid medium in the vacuum bellows, leading to abnormal extrusion at the front end position of the vacuum bellows under the push of the fluid medium, and abnormal stretching at the rear end position. This results in uneven tensile force on the vacuum bellows, extremely likely causing metal fatigue of the bellows, leading to problems such as cracking and appearance of cracks, as well as increasing the pressure inside the bellows. Secondly, the overall unevenness of the inner diameter will also hinder the speed and efficiency of the fluid medium passing through the vacuum bellows. The residence time of the fluid medium in the vacuum bellows increases, and the pressure borne by the vacuum bellows rises, which is not conducive to the long-term and safe use of the vacuum bellows. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a composite vacuum metal hose that can overcome or at least partially solve the above problems.

[0004] To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is: a composite vacuum metal hose, including an outer bellows with outer connecting pipes connected to both ends, further including: flanges respectively connected to the two outer connecting pipes, and the two flanges at both ends are respectively connected to a first connecting pipe and a second connecting pipe; an inner bellows with both ends respectively connected to the first connecting pipe and the second connecting pipe; a sleeve sleeved on the inner bellows, and both ends of the sleeve are respectively connected to the first connecting pipe and the second connecting pipe; a vacuum cavity located between the outer bellows and the sleeve; a first sliding sleeve pipe and a second sliding sleeve pipe respectively arranged in the inner bellows for dynamically adjusting the pressure inside the inner bellows.

[0005] Preferably, step end rings and convex rings are respectively arranged at both ends of the first sliding sleeve pipe and the second sliding sleeve pipe. The first sliding sleeve pipe and the second sliding sleeve pipe are both limited in the grooves of the inner bellows through the convex rings, and the first sliding sleeve pipe and the second sliding sleeve pipe both slide in the corresponding first connecting pipe and second connecting pipe through the step end rings.

[0006] Preferably, an adjustment area is formed between the first sliding sleeve and the second sliding sleeve, and a first smooth area and a second smooth area are respectively formed in the inner layer corrugated pipe by the first sliding sleeve and the second sliding sleeve.

[0007] Preferably, a first dynamic adjustment spring is sleeved on the second sliding sleeve, and the first dynamic adjustment spring is located between the step end ring of the second sliding sleeve and the second clamping end of the inner layer corrugated pipe.

[0008] Preferably, the inner diameter of the second channel opened in the first connecting pipe is larger than the inner diameter of the first channel, and a second dynamic adjustment spring is arranged in the second channel.

[0009] Furthermore, a spiral groove is provided on the inner wall of the first channel in the first connecting pipe.

[0010] Furthermore, a first filling cavity is formed between the kit and the inner layer corrugated pipe, and the first filling cavity is filled with oil.

[0011] Furthermore, a second filling cavity is formed between the first sliding sleeve, the second sliding sleeve and the inner layer corrugated pipe, and the second filling cavity is filled with oil.

[0012] Furthermore, a discharge pipe is installed on the outer diameter of the outer connecting pipe, the discharge pipe is communicated with the vacuum cavity, and an elastic sealing cover is rotatably arranged at one end of the discharge pipe.

[0013] Furthermore, connecting rings are fixedly connected to both of the outer connecting pipes, a pull rod is slidably connected between the two connecting rings, and a buffer spring is connected between the end of the pull rod and the connecting ring.

[0014] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. For this composite vacuum metal hose, when the fluid medium passes through the inner layer corrugated pipe, the first sliding sleeve and the second sliding sleeve can dynamically adjust the pressure borne by the inner layer corrugated pipe, avoiding over-stretching and over-extrusion of the inner layer corrugated pipe, and further reducing the resistance of the fluid medium passing through the inner layer corrugated pipe; secondly, the oil in the first filling cavity can block the external temperature from being transmitted into the inner layer corrugated pipe and can weaken the impact of the fluid medium on the inner layer corrugated pipe.

[0015] 2. For this composite vacuum metal hose, filling the oil between the kit and the inner layer corrugated pipe can play a role of flexible pressure suction. When the flow rate of the fluid medium changes suddenly, the oil absorbs the local pressure peak through viscous resistance, reducing the instantaneous impact force of the fluid medium on the inner layer corrugated pipe. Moreover, the viscoelastic properties of the oil can simultaneously dissipate the high-frequency vibration energy and low-frequency fluctuation energy generated when the fluid medium passes through, and delay the generation of fatigue cracks, further improving the service life of the device.

[0016] 3. When the inner corrugated pipe and the kit of the composite vacuum metal hose are damaged, the oil in the first filling cavity and the second filling cavity enters the vacuum cavity, increasing the proportion of oil in the vacuum cavity. At this time, when the fluid medium leaks into the vacuum cavity, most of the oil in the vacuum cavity needs to be discharged through the discharge pipe before the fluid medium can leak out, effectively slowing down the leakage of the fluid medium.

[0017] 4. For the composite vacuum metal hose, the extension pipe is provided to further reduce the resistance generated by the inner wall of the inner corrugated pipe on the fluid medium when the fluid medium passes through the inner corrugated pipe, making the passing efficiency of the fluid medium higher; the gap between the outer diameter of the extension pipe and the inner diameter of the first sliding sleeve can allow the fluid medium to enter the adjustment area, enabling the adjustment area to continue to function; the setting of the anti-fluid buffer area can buffer the fluid medium flowing back in the opposite direction when the fluid medium breaks off, avoiding excessive impact on the inner corrugated pipe.

[0018] The following further describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. Description of the Drawings

[0019] In the drawings: Figure 1 is a schematic structural diagram of a composite vacuum metal hose proposed by the present invention; Figure 2 is a schematic structural diagram of the outer connecting pipe and the outer corrugated pipe of a composite vacuum metal hose proposed by the present invention; Figure 3 is a schematic structural diagram of the pull rod and the buffer spring of a composite vacuum metal hose proposed by the present invention; Figure 4 is a schematic structural diagram of the first connecting pipe and the second connecting pipe of a composite vacuum metal hose proposed by the present invention; Figure 5 is a schematic structural diagram of the second dynamic adjustment spring of a composite vacuum metal hose proposed by the present invention; Figure 6 is a schematic structural diagram of the vacuum cavity, the first filling cavity, and the second filling cavity of a composite vacuum metal hose proposed by the present invention; Figure 7 is a schematic structural diagram of the extension pipe of a composite vacuum metal hose proposed by the present invention; Figure 8 is a schematic structural diagram of the stepped end ring and the convex ring of a composite vacuum metal hose proposed by the present invention.

[0020] In the figure: 1. Flange; 11. Outer connecting pipe; 12. Outer corrugated pipe; 121. First clamping end; 13. Connecting ring; 131. Tie rod; 132. Buffer spring; 14. Stop valve; 15. Vacuum chamber; 16. First filling chamber; 17. Second filling chamber; 18. Extension pipe; 181. Reverse fluid buffer zone; 2. Inner corrugated pipe; 201. Second clamping end; 202. Groove; 203. First sliding sleeve; 204. Convex ring; 205. Step end ring; 206. Second sliding sleeve; 207. First dynamic adjustment spring; 21. First connecting pipe; 211. First channel; 212. Spiral groove; 213. Second channel; 214. Second dynamic adjustment spring; 22. Second connecting pipe; 3. Kit; 31. Compression sleeve; 4. Discharge pipe; 41. Elastic seal; 5. Adjustment area; 6. First smooth area; 7. Second smooth area. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0022] The following combines the attached Figure 1 - attached Figure 8 , and details the technical solutions provided by each embodiment of the present invention.

[0023] Embodiment 1: Refer to Figures 1-8 , a composite vacuum metal hose, including an outer corrugated pipe 12 with outer connecting pipes 11 connected to both ends. First clamping ends 121 are provided at both ends of the outer corrugated pipe 12 for clamping onto the outer connecting pipes 11 and then being connected by welding. It further includes: a flange 1 respectively connected to the two outer connecting pipes 11, and the two flanges 1 at both ends are respectively connected to a first connecting pipe 21 and a second connecting pipe 22; an inner corrugated pipe 2 with both ends respectively connected to the first connecting pipe 21 and the second connecting pipe 22; a kit 3 sleeved on the inner corrugated pipe 2, with both ends of the kit 3 respectively connected to the first connecting pipe 21 and the second connecting pipe 22; a vacuum chamber 15 located between the outer corrugated pipe 12 and the kit 3; a first sliding sleeve 203 and a second sliding sleeve 206 respectively arranged in the inner corrugated pipe 2 for dynamically adjusting the pressure inside the inner corrugated pipe 2; Step end rings 205 and convex rings 204 are respectively provided at both ends of the first sliding sleeve 203 and the second sliding sleeve 206. The first sliding sleeve 203 and the second sliding sleeve 206 are both limited in the grooves 202 of the inner corrugated pipe 2 through the convex rings 204, and the first sliding sleeve 203 and the second sliding sleeve 206 both slide in the corresponding first connecting pipe 21 and second connecting pipe 22 through the step end rings 205; The length of the inner corrugated pipe 2 is L, and the lengths of the first sliding sleeve 203 and the second sliding sleeve 206 are L1 and L2 respectively, where L1 = L / 3 and L2 = L / 3; An adjustment area 5 is formed between the first sliding sleeve 203 and the second sliding sleeve 206, and a first smooth area 6 and a second smooth area 7 are respectively formed by the first sliding sleeve 203 and the second sliding sleeve 206 in the inner corrugated pipe 2.

[0024] During use, it is connected to the stop valve 14 on the outer connecting pipe 11 through a vacuum pump to evacuate the vacuum chamber 15, so that a vacuum or quasi-vacuum is formed in the vacuum chamber 15 to isolate the influence of the external temperature on the fluid medium inside the inner corrugated pipe 2; The fluid medium flows from the second connecting pipe 22 towards the first connecting pipe 21. When the fluid medium enters the inner corrugated pipe 2, one-third of the inner wall of the inner corrugated pipe 2 is blocked by the provided second sliding sleeve 206. This enables the fluid medium to reduce the impact on the inner corrugated pipe 2 when it enters the inner corrugated pipe 2, that is, the second smooth area 7 formed by the second sliding sleeve 206 in the inner corrugated pipe 2. The inner wall of the second sliding sleeve 206 is a smooth surface, so it can enable the fluid medium to smoothly enter the inner corrugated pipe 2, thereby reducing the impact on the inner corrugated pipe 2. When the fluid medium passes through the second smooth area 7 and enters the adjustment area 5, the adjustment area 5 can automatically adaptively change according to the pressure of the fluid medium to weaken the pressure brought by the fluid medium entering the inner corrugated pipe 2. Thus, while reducing the impact of the fluid medium on the inner corrugated pipe 2, it reduces the resistance of the fluid medium and increases the speed of the fluid medium passing through the inner corrugated pipe 2, thereby extending the service life of this device; Secondly, when the fluid medium enters the inner corrugated pipe 2 and impacts the groove 202 of the inner corrugated pipe 2 in the adjustment area 5, when the inner corrugated pipe 2 is displaced under the force, it will drive the first sliding sleeve 203 and the second sliding sleeve 206 to slide in the corresponding first connecting pipe 21 and second connecting pipe 22, so that the inner corrugated pipe 2 can extend itself when being impacted by the fluid medium, reducing the hard contact with the fluid medium, and thus weakening the impact on the inner corrugated pipe 2; Secondly, further, a first dynamic adjustment spring 207 is sleeved on the second sliding sleeve 206, and the first dynamic adjustment spring 207 is located between the stepped end ring 205 of the second sliding sleeve 206 and the second clamping end 201 of the inner corrugated pipe 2.

[0025] The inner diameter of the second channel 213 opened in the first connecting pipe 21 is larger than the inner diameter of the first channel 211, and a second dynamic adjustment spring 214 is provided in the second channel 213.

[0026] When the fluid medium impacts the inner corrugated pipe 2, the inner corrugated pipe 2 will be stretched towards the first sliding sleeve 203. Since the first sliding sleeve 203 is connected to the inner corrugated pipe 2 through the convex ring 204, the first sliding sleeve 203 will be pushed and squeeze the second dynamic adjustment spring 214. The second dynamic adjustment spring 214 provides damping buffering for the stretching of the inner corrugated pipe 2, avoiding excessive extrusion of the inner corrugated pipe 2 near the first sliding sleeve 203 and causing metal material fatigue; While the inner corrugated pipe 2 is impacted by the fluid medium, the inner corrugated pipe 2 near the second sliding sleeve 206 will be stretched, driving the second sliding sleeve 206 to slide in the second connecting pipe 22 and squeeze the first dynamic adjustment spring 207. Therefore, the first sliding sleeve 203 and the second sliding sleeve 206 provided in this device can dynamically adjust the pressure borne by the inner corrugated pipe 2 when the fluid medium passes through the inner corrugated pipe 2, and further reduce the resistance of the fluid medium passing through the inner corrugated pipe 2.

[0027] It should be understood that second clamping ends 201 are provided at both ends of the inner corrugated pipe 2. An annular groove is provided on the end face of the second clamping end 201. The second clamping end 201 is clamped on the corresponding first connecting pipe 21 and second connecting pipe 22 through the annular groove, and then welded to achieve connection. Therefore, the inner diameter of the end face of the second clamping end 201 will be located in the first connecting pipe 21 and the second connecting pipe 22, and a step will be formed in the first connecting pipe 21 and the second connecting pipe 22. This step can effectively limit the first sliding sleeve 203 and the second sliding sleeve 206 in the first connecting pipe 21 and the second connecting pipe 22 to avoid slipping.

[0028] Example 2: Refer to Figure 1 、 Figure 6 , a composite vacuum metal hose, which is basically the same as Example 1. Further: a spiral groove 212 is provided on the inner wall of the first channel 211 in the first connecting pipe 21; The setting of the spiral groove 212 can enable the fluid medium passing through the inner corrugated pipe 2 to pass through more quickly, increase the flow rate, and further weaken the pressure on the inner corrugated pipe 2; Secondly, when the first sliding sleeve 203 squeezes the second dynamic adjustment spring 214, the distance between the first sliding sleeve 203 and the first channel 211 decreases. This enables the fluid medium to pass through the spiral groove 212 more quickly for acceleration and discharge when passing through the first smooth area 6 of the first sliding sleeve 203.

[0029] Example 3: Refer to Figure 6, a composite vacuum metal hose, which is basically the same as that of Embodiment 2. Further, a first filling cavity 16 is formed between the kit 3 and the inner corrugated pipe 2, and the first filling cavity 16 is filled with oil; both ends of the kit 3 are connected to the first connecting pipe 21 and the second connecting pipe 22 through a compression sleeve 31, and are fixedly connected by welding; The oil in the first filling cavity 16 can further cooperate with the vacuum cavity 15 to block the external temperature from being transmitted into the inner corrugated pipe 2. Moreover, the setting of the oil can further weaken the impact of the fluid medium on the inner corrugated pipe 2; Specifically, the oil filling amount in the first filling cavity 16 accounts for 85%-90% of the first filling cavity 16. The oil between the kit 3 and the inner corrugated pipe 2 can play a role of flexible pressure suction. When the flow rate of the fluid medium changes suddenly, the oil absorbs the local pressure peak through viscous resistance and reduces the instantaneous impact force of the fluid medium on the inner corrugated pipe 2; The viscoelastic characteristics of the oil can simultaneously dissipate the high-frequency vibration energy and low-frequency fluctuation energy generated when the fluid medium passes through, further improving the service life of the device; When the fluid medium impacts the inner corrugated pipe 2, when the inner corrugated pipe 2 axially expands and contracts under the pressure fluctuation of the fluid medium, the oil absorbs the expansion and contraction ability through viscous shear force, reduces the dynamic stress amplitude of the inner corrugated pipe 2, and delays the generation of fatigue cracks; Secondly, the incompressibility of the oil limits the expansion and contraction speed of the inner corrugated pipe 2 due to the flow resistance of the oil, thereby effectively avoiding the deformation of the inner corrugated pipe 2 caused by the sudden change of the fluid medium pressure and effectively improving the service life of the device; When the oil filled in the first filling cavity 16 is in a full state, the oil static pressure exerts a uniform radial pressure on the outer wall of the inner corrugated pipe 2, equivalently increasing the circumferential stiffness of the inner corrugated pipe 2 and suppressing the circumferential deformation caused by the pressure fluctuation of the fluid medium. Secondly, the oil can also improve the ability of the inner corrugated pipe 2 to resist external crushing.

[0030] When the fluid medium contains a heat source, the setting of the oil can also slow down the temperature rise of the inner corrugated pipe 2 and reduce the non-uniform thermal expansion stress caused by the internal and external temperature difference; Moreover, the low thermal conductivity of the oil (compared with metal) can block the conduction of external heat to the inner corrugated pipe 2. At the same time, the heat of the internal fluid needs to first pass through the metal wall of the inner corrugated pipe 2 and then be transferred to the vacuum cavity 15 through the oil, significantly extending the thermal equilibrium time, reducing the risk of thermal shock, and prolonging the service life.

[0031] The kit 3 uses a metal braided mesh. When the metal braided mesh is used, the flexibility of the device is further increased. It should be understood that the metal braided mesh has a high density and will not generate gaps. Further, an oil-blocking film is provided on the inner wall of the metal braided mesh to further prevent the oil in the first filling cavity 16 from penetrating into the vacuum cavity 15.

[0032] A second filling cavity 17 is formed between the first sliding sleeve 203, the second sliding sleeve 206 and the inner corrugated pipe 2, and the second filling cavity 17 is filled with oil. The oil in the second filling cavity 17 can improve the smoothness of the sliding of the first sliding sleeve 203 and the second sliding sleeve 206, avoid jamming, and secondly, it can also improve the protection of the inner corrugated pipe 2.

[0033] Example 4: Refer to Figure 7 , a composite vacuum metal hose, which is basically the same as that in Example 3. Further, a discharge pipe 4 is installed on the outer diameter of the outer connecting pipe 11, the discharge pipe 4 is communicated with the vacuum cavity 15, and an elastic seal 41 is rotatably arranged at one end of the discharge pipe 4; The elastic seal 41 is tightly covered on the discharge pipe 4 by a torsion spring or other elastic structure. When the inner corrugated pipe 2 and the kit 3 are ruptured, the fluid medium will enter the vacuum cavity 15. When the pressure of the fluid medium is less than the pressure of the elastic seal 41 tightly covering the discharge pipe 4, the fluid medium will not leak, so that the device can continue to be used; When the pressure in the vacuum cavity 15 is greater than the pressure of the elastic seal 41 tightly covering the discharge pipe 4, a gap is generated between the elastic seal 41 and the discharge pipe 4, and the internal oil will leak out from the discharge pipe 4, thus playing a role in prompting the leakage of the fluid medium.

[0034] Further, the vacuum cavity 15 is filled with oil accounting for 25%-30% of the volume of the vacuum cavity 15. When the inner corrugated pipe 2 and the kit 3 are ruptured, the oil in the first filling cavity 16 and the second filling cavity 17 enters the vacuum cavity 15, increasing the proportion of oil in the vacuum cavity 15. At this time, when the fluid medium leaks into the vacuum cavity 15, most of the oil in the vacuum cavity 15 needs to be discharged through the discharge pipe 4 before the fluid medium can leak out, effectively slowing down the leakage of the fluid medium.

[0035] Example 5: Refer to Figure 6 , a composite vacuum metal hose, which is basically the same as that in Example 4. Further, connection rings 13 are fixedly connected to both outer connecting pipes 11, a pull rod 131 is slidably connected between the two connection rings 13, and a buffer spring 132 is connected between the end of the pull rod 131 and the connection ring 13; The setting of the buffer spring 132 can improve the dynamic adjustment ability of the outer corrugated pipe 12.

[0036] Example 6: Refer to Figure 7 , a composite vacuum metal hose, which is basically the same as that in Example 3. Further, an extension pipe 18 is fixedly connected to one end of the second sliding sleeve 206 close to the adjustment area 5. One end of the extension pipe 18 passes through the adjustment area 5 and enters the first sliding sleeve 203. There is a gap between the outer diameter of the extension pipe 18 extending into the first sliding sleeve 203 and the inner diameter of the first sliding sleeve 203. A reverse fluid buffer area 181 is formed between the extension pipe 18 and the adjustment area 5; By providing the extension pipe 18, when the fluid medium passes through the inner corrugated pipe 2, the resistance generated by the inner wall of the inner corrugated pipe 2 to the fluid medium is further reduced, so that the fluid medium passes through more efficiently; The gap between the outer diameter of the extension pipe 18 and the inner diameter of the first sliding sleeve 203 enables the fluid medium to enter the adjustment area 5, so that the adjustment area 5 continues to play its role; The setting of the reverse fluid buffer area 181 can buffer the fluid medium flowing back in the reverse direction into the reverse fluid buffer area 181 when the fluid medium is cut off, avoiding excessive impact on the inner corrugated pipe 2.

[0037] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been described above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content to be equivalent embodiments within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. A composite vacuum metal hose, comprising an outer corrugated pipe (12) with outer connecting pipes (11) connected to both ends thereof, characterized in that, It further includes: Flanges (1) are respectively connected to the two outer connecting pipes (11), and the two flanges (1) at both ends are respectively connected to the first connecting pipe (21) and the second connecting pipe (22); An inner corrugated pipe (2) has two ends respectively connected to the first connecting pipe (21) and the second connecting pipe (22); A kit (3) is sleeved on the inner corrugated pipe (2), and two ends of the kit (3) are respectively connected to the first connecting pipe (21) and the second connecting pipe (22); A vacuum chamber (15) is located between the outer corrugated pipe (12) and the kit (3); A first sliding sleeve pipe (203) and a second sliding sleeve pipe (206) are respectively arranged in the inner corrugated pipe (2) for dynamically adjusting the pressure inside the inner corrugated pipe (2).

2. The composite vacuum metal hose according to claim 1, characterized in that, Step end rings (205) and convex rings (204) are respectively arranged at two ends of the first sliding sleeve pipe (203) and the second sliding sleeve pipe (206). The first sliding sleeve pipe (203) and the second sliding sleeve pipe (206) are both limited in the groove (202) of the inner corrugated pipe (2) through the convex rings (204), and the first sliding sleeve pipe (203) and the second sliding sleeve pipe (206) both slide in the corresponding first connecting pipe (21) and second connecting pipe (22) through the step end rings (205).

3. The composite vacuum metal hose according to claim 2, characterized in that, An adjustment area (5) is formed between the first sliding sleeve pipe (203) and the second sliding sleeve pipe (206), and a first smooth area (6) and a second smooth area (7) are respectively formed in the inner corrugated pipe (2) by the first sliding sleeve pipe (203) and the second sliding sleeve pipe (206).

4. The composite vacuum metal hose according to claim 3, wherein, A first dynamic adjustment spring (207) is sleeved on the second sliding sleeve pipe (206), and the first dynamic adjustment spring (207) is located between the step end ring (205) of the second sliding sleeve pipe (206) and the second clamping end (201) of the inner corrugated pipe (2).

5. A composite vacuum metal hose according to claim 4, characterized in that, The inner diameter of the second channel (213) opened in the first connecting pipe (21) is larger than the inner diameter of the first channel (211), and a second dynamic adjustment spring (214) is arranged in the second channel (213).

6. The composite vacuum metal hose according to claim 5, characterized in that, A spiral groove (212) is provided on the inner wall of the first channel (211) in the first connecting pipe (21).

7. A composite vacuum metal hose according to claim 5, characterized in that, A first filling cavity (16) is formed between the kit (3) and the inner corrugated pipe (2), and the first filling cavity (16) is filled with oil.

8. A composite vacuum metal hose according to claim 7, characterized in that, A second filling cavity (17) is formed between the first sliding sleeve pipe (203), the second sliding sleeve pipe (206) and the inner corrugated pipe (2), and the second filling cavity (17) is filled with oil.

9. The composite vacuum metal hose according to claim 8, wherein, A discharge pipe (4) is installed on the outer diameter of the outer connecting pipe (11), the discharge pipe (4) is communicated with the vacuum chamber (15), and an elastic sealing cover (41) is rotatably arranged at one end of the discharge pipe (4).

10. A composite vacuum metal hose according to claim 9, characterized in that, Connecting rings (13) are fixedly connected to both of the two outer connecting pipes (11), a pull rod (131) is slidably connected between the two connecting rings (13), and a buffer spring (132) is connected between the end of the pull rod (131) and the connecting ring (13).

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