A composite vacuum metal hose

Abstract

The present invention discloses a composite vacuum metal hose, which relates to the technical field of vacuum metal hoses. A composite vacuum metal hose comprises an outer layer bellows with outer connecting tubes connected at both ends; the first sliding sleeve and the second sliding sleeve provided by the present invention can dynamically adjust the pressure borne by the inner layer bellows when the fluid medium passes through the inner layer bellows, thereby preventing the inner layer bellows from being overstretched and over-extended, and further reducing the resistance of the fluid medium passing through the inner layer bellows; allowing the fluid medium to smoothly enter the inner layer bellows, reducing the impact on the inner layer bellows, and the adjustment area can automatically adapt to the pressure of the fluid medium entering the inner layer bellows, so as to weaken the pressure brought by the fluid medium entering the inner layer bellows, thereby reducing the impact of the fluid medium on the inner layer bellows while reducing the resistance of the fluid medium, increasing the speed of the fluid medium passing through the inner layer bellows, and extending the service life.

Description

Technical Field

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

[0002] The vacuum metal bellows is a specially designed piping component, whose axisymmetric structure and corrugated shape make it flexible to a certain extent.

[0003] The inner diameter of the existing vacuum bellows is usually corrugated, and the corrugation is uneven in cross section. As a result, when the fluid medium passes through the vacuum bellows, the fluid medium will be blocked by the uneven inner diameter, causing the vacuum bellows to be subjected to a large impact. This will cause the front end of the fluid medium in the moving direction of the vacuum bellows to be subjected to a large thrust of the fluid medium, causing the vacuum bellows to be abnormally squeezed at the front end position and abnormally stretched at the rear end position under the push of the fluid medium, which causes uneven tension on the vacuum bellows, which can easily lead to metal fatigue of the bellows, resulting in problems such as cracking and cracks, and increase 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, increase the residence time of the fluid medium in the vacuum bellows, and increase the bearing pressure of the vacuum bellows, which is not conducive to the long-term and safe use of the vacuum bellows. Summary of the Invention

[0004] 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 the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a composite vacuum metal hose, including an outer layer bellows with outer connecting pipes connected at both ends, and also including: flanges, respectively connected to the two outer layer connecting pipes, and the two flanges located at both ends are respectively connected to the first connecting pipe and the second connecting pipe; an inner layer bellows, the two ends of which are respectively connected to the first connecting pipe and the second connecting pipe; a sleeve, which is sleeved on the inner layer bellows, and the two ends of the sleeve are respectively connected to the first connecting pipe and the second connecting pipe; a vacuum chamber, located between the outer layer bellows and the sleeve; a first sliding sleeve and a second sliding sleeve, respectively arranged in the inner layer bellows, for dynamically adjusting the pressure in the inner layer bellows.

[0006] Preferably, the two ends of the first sliding sleeve and the second sliding sleeve are respectively provided with a step end ring and a convex ring, and the first sliding sleeve and the second sliding sleeve are both limited in the groove of the inner corrugated tube by the convex ring, and the first sliding sleeve and the second sliding sleeve are both slid in the corresponding first connecting tube and the second connecting tube through the step end ring.

[0007] Preferably, an adjustment zone is formed between the first sliding sleeve and the second sliding sleeve, and a first smooth zone and a second smooth zone are formed in the inner layer corrugated tube of the first sliding sleeve and the second sliding sleeve, respectively.

[0008] 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 tube.

[0009] 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 provided in the second channel.

[0010] Furthermore, a spiral groove is formed on the inner wall of the first channel in the first connecting pipe.

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

[0012] Furthermore, a second filling cavity is formed between the first sliding sleeve, the second sliding sleeve and the inner layer bellows, and the second filling cavity is filled with oil.

[0013] Furthermore, a discharge pipe is installed on the outer diameter of the outer connecting pipe, the discharge pipe is connected to the vacuum chamber, and an elastic sealing cover is rotatably provided on one end of the discharge pipe.

[0014] Furthermore, the two outer connecting tubes are fixedly connected with connecting rings, 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.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] 1. The composite vacuum metal hose can dynamically adjust the pressure on the inner bellows when the fluid medium passes through the inner bellows through the first sliding sleeve and the second sliding sleeve, thereby preventing the inner bellows from being over-stretched and over-squeezed, and further reducing the resistance of the fluid medium passing through the inner bellows; secondly, the oil in the first filling chamber can prevent the external temperature from being transmitted into the inner bellows, and can reduce the impact of the fluid medium on the inner bellows.

[0017] 2. The composite vacuum metal hose is filled with oil between the kit and the inner bellows, which can play the role of flexible pressure suction. When the flow rate of the fluid medium suddenly changes, the oil absorbs the local pressure peak through viscous resistance, reducing the instantaneous impact force of the fluid medium on the inner bellows. The viscoelastic properties of the oil can simultaneously dissipate the high-frequency vibration energy and low-frequency fluctuation energy generated by the fluid medium when passing through, and delay the occurrence of fatigue cracks, further improving the service life of the device.

[0018] 3. When the inner bellows and the kit of the composite vacuum metal hose are ruptured, the oil in the first filling chamber and the second filling chamber enters the vacuum chamber, causing the proportion of oil in the vacuum chamber to increase. At this time, when the fluid medium leaks into the vacuum chamber, most of the oil in the vacuum chamber needs to be discharged through the discharge pipe before the fluid medium can leak out, effectively slowing down the leakage of the fluid medium.

[0019] 4. The composite vacuum metal hose, through the provision of an extension tube, can further reduce the resistance of the fluid medium caused by the inner wall of the inner bellows to the fluid medium when the fluid medium passes through the inner bellows, thereby making the fluid medium pass through more efficiently; the gap between the outer diameter of the extension tube and the inner diameter of the first sliding sleeve can allow the fluid medium to enter the adjustment area, so that the adjustment area continues to function; and the provision of the anti-fluid buffer zone can enable the fluid medium flowing back in the opposite direction to enter the anti-fluid buffer zone for buffering when the fluid medium is cut off, thereby avoiding excessive impact on the inner bellows.

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the attached figure:

[0022] Figure 1 This is a schematic structural diagram of a composite vacuum metal hose proposed by the present invention;

[0023] Figure 2 This is a schematic structural diagram of the outer connecting pipe and outer corrugated pipe of a composite vacuum metal hose proposed by the present invention;

[0024] Figure 3 This is a structural diagram of a pull rod and a buffer spring of a composite vacuum metal hose proposed by the present invention;

[0025] Figure 4 This is a schematic structural diagram of a first connecting pipe and a second connecting pipe of a composite vacuum metal hose proposed by the present invention;

[0026] Figure 5 This is a schematic structural diagram of a second dynamic adjustment spring of a composite vacuum metal hose proposed by the present invention;

[0027] Figure 6 This is a schematic structural diagram of a vacuum chamber, a first filling chamber, and a second filling chamber of a composite vacuum metal hose proposed in the present invention;

[0028] Figure 7 This is a schematic structural diagram of an extension tube of a composite vacuum metal hose proposed in the present invention;

[0029] Figure 8This is a structural schematic diagram of the stepped end ring and convex ring of a composite vacuum metal hose proposed by the present invention.

[0030] In the figure: 1. flange; 11. outer connecting pipe; 12. outer bellows; 121. first clamping end; 13. connecting ring; 131. pull rod; 132. buffer spring; 14. stop valve; 15. vacuum chamber; 16. first filling chamber; 17. second filling chamber; 18. extension pipe; 181. anti-fluid buffer zone; 2. inner bellows; 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. press sleeve; 4. discharge pipe; 41. elastic sealing cover; 5. adjustment area; 6. first smooth area; 7. second smooth area. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the 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.

[0032] The following is combined with Figure 1 -Attached Figure 8 , describes in detail the technical solutions provided by each embodiment of the present invention.

[0033] Example 1: Reference Figures 1-8 , a composite vacuum metal hose, including an outer bellows 12 with outer connecting tubes 11 connected at both ends, and first clamping ends 121 are provided at both ends of the outer bellows 12 for clamping on the outer connecting tube 11 and then connected by welding, and also including: flanges 1, respectively connected to the two outer connecting tubes 11, and the two flanges 1 at both ends are respectively connected to the first connecting tube 21 and the second connecting tube 22; an inner bellows 2, with the first connecting tube 21 and the second connecting tube 22 at both ends respectively; a sleeve 3, sleeved on the inner bellows 2, with the two ends of the sleeve 3 connected to the first connecting tube 21 and the second connecting tube 22 respectively; a vacuum chamber 15, located between the outer bellows 12 and the sleeve 3; a first sliding sleeve 203 and a second sliding sleeve 206, respectively arranged in the inner bellows 2, for dynamically adjusting the pressure in the inner bellows 2;

[0034] A stepped end ring 205 and a convex ring 204 are provided at both ends of the first sliding sleeve 203 and the second sliding sleeve 206, respectively. The first sliding sleeve 203 and the second sliding sleeve 206 are both limited in the groove 202 of the inner layer corrugated tube 2 by the convex ring 204. The first sliding sleeve 203 and the second sliding sleeve 206 slide in the corresponding first connecting tube 21 and the second connecting tube 22 via the stepped end ring 205.

[0035] The length of the inner layer corrugated tube 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;

[0036] An adjustment area 5 is formed between the first sliding sleeve 203 and the second sliding sleeve 206 . A first smoothing area 6 and a second smoothing area 7 are formed in the inner layer corrugated tube 2 of the first sliding sleeve 203 and the second sliding sleeve 206 , respectively.

[0037] When in use, a vacuum pump is connected to the stop valve 14 on the outer connecting pipe 11 to evacuate the vacuum chamber 15 so that a vacuum or quasi-vacuum is formed in the vacuum chamber 15 to isolate the fluid medium in the inner bellows 2 from the influence of the external temperature.

[0038] The fluid medium flows from the second connecting pipe 22 toward the direction of the first connecting pipe 21. When the fluid medium enters the inner bellows 2, the second sliding sleeve 206 is provided to block one-third of the inner wall of the inner bellows 2. This reduces the impact on the inner bellows 2 when the fluid medium enters the inner bellows 2. That is, the second sliding sleeve 206 forms a second smooth zone 7 in the inner bellows 2. The inner wall of the second sliding sleeve 206 is a smooth surface, so that the fluid medium can smoothly enter the inner bellows 2, thereby reducing the impact on the inner bellows 2. When the fluid medium passes through the second smooth zone 7 and enters the adjustment zone 5, the adjustment zone 5 can automatically adapt to the pressure of the fluid medium entering the inner bellows 2, thereby reducing the pressure brought by the fluid medium entering the inner bellows 2. While reducing the impact of the fluid medium on the inner bellows 2, the resistance of the fluid medium is reduced, and the speed at which the fluid medium passes through the inner bellows 2 is increased, thereby extending the service life of the device.

[0039] Secondly, when the fluid medium enters the inner bellows 2 and impacts the groove 202 of the inner bellows 2 in the adjustment area 5, the inner bellows 2 is displaced by the force, which drives the first sliding sleeve 203 and the second sliding sleeve 206 to slide in the corresponding first connecting tube 21 and the second connecting tube 22, so that the inner bellows 2 can stretch itself when impacted by the fluid medium, reducing hard contact with the fluid medium and thereby weakening the impact on the inner bellows 2;

[0040] 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 step end ring 205 of the second sliding sleeve 206 and the second clamping end 201 of the inner layer corrugated tube 2 .

[0041] The inner diameter of the second channel 213 defined in the first connecting pipe 21 is larger than the inner diameter of the first channel 211 . A second dynamic adjustment spring 214 is disposed in the second channel 213 .

[0042] When the fluid medium impacts the inner bellows 2, the inner bellows 2 will stretch toward the first sliding sleeve 203. Since the first sliding sleeve 203 is connected to the inner bellows 2 via 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 for the stretching of the inner bellows 2, preventing the inner bellows 2 near the first sliding sleeve 203 from being excessively squeezed, which would cause fatigue of the metal material.

[0043] When the inner bellows 2 is impacted by the fluid medium, the inner bellows 2 near the second sliding sleeve 206 will be stretched, and drive the second sliding sleeve 206 to slide in the second connecting tube 22 and squeeze the first dynamic adjustment spring 207. For this reason, the first sliding sleeve 203 and the second sliding sleeve 206 provided in this device can dynamically adjust the pressure borne by the inner bellows 2 when the fluid medium passes through the inner bellows 2, and further reduce the resistance of the fluid medium passing through the inner bellows 2.

[0044] It should be understood that both ends of the inner layer corrugated tube 2 are provided with a second clamping end 201, and an annular groove is provided on the end face of the second clamping end 201. The second clamping end 201 is clamped to the corresponding first connecting tube 21 and the second connecting tube 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 tube 21 and the second connecting tube 22, and a step will be formed in the first connecting tube 21 and the second connecting tube 22. The step can effectively limit the first sliding sleeve 203 and the second sliding sleeve 206 in the first connecting tube 21 and the second connecting tube 22 to avoid slipping.

[0045] Example 2: Reference Figure 1 、 Figure 6 , a composite vacuum metal hose, which is basically the same as that of embodiment 1, further comprising: a spiral groove 212 is formed on the inner wall of the first channel 211 in the first connecting tube 21;

[0046] The setting of the spiral groove 212 can accelerate the fluid medium passing through the inner layer bellows 2, increase the flow rate, and further reduce the pressure on the inner layer bellows 2;

[0047] 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 is reduced, so that the fluid medium can be discharged faster through the spiral groove 212 when passing through the first smooth zone 6 of the first sliding sleeve 203.

[0048] Example 3: Reference Figure 6 A composite vacuum metal hose is substantially the same as that of Example 2, except that: a first filling cavity 16 is formed between the sleeve 3 and the inner layer bellows 2, and the first filling cavity 16 is filled with oil; both ends of the sleeve 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;

[0049] The oil in the first filling chamber 16 can further cooperate with the vacuum chamber 15 to block the external temperature from being transmitted into the inner bellows 2. The setting of the oil can further reduce the impact of the fluid medium on the inner bellows 2.

[0050] Specifically, the oil filling volume in the first filling chamber 16 accounts for 85%-90% of the first filling chamber 16. The oil between the sleeve 3 and the inner bellows 2 can play a role of flexible pressure suction. When the flow rate of the fluid medium suddenly changes, the oil absorbs the local pressure peak through viscous resistance, thereby reducing the instantaneous impact force of the fluid medium on the inner bellows 2.

[0051] The viscoelastic properties of the oil can simultaneously dissipate the high-frequency vibration energy and low-frequency wave energy generated by the fluid medium when passing through, further increasing the service life of the device;

[0052] When the fluid medium impacts the inner bellows 2, the inner bellows 2 expands and contracts axially due to the pressure fluctuation of the fluid medium. The oil absorbs the expansion and contraction capacity through viscous shear force, thereby reducing the dynamic stress amplitude of the inner bellows 2 and delaying the occurrence of fatigue cracks.

[0053] Secondly, the incompressibility of the oil means that the expansion and contraction speed of the inner bellows 2 is limited by the flow resistance of the oil, thereby effectively avoiding the deformation of the inner bellows 2 caused by sudden changes in the fluid medium pressure, and effectively improving the service life of the device;

[0054] When the first filling chamber 16 is filled with oil, the static pressure of the oil exerts a uniform radial pressure on the outer wall of the inner bellows 2, which effectively increases the annular stiffness of the inner bellows 2 and suppresses the circumferential deformation caused by pressure fluctuations of the fluid medium. Secondly, the oil can also improve the ability of the inner bellows 2 to resist external crushing.

[0055] When the fluid medium contains a heat source, the setting of the oil can also slow down the temperature rise of the inner bellows 2 and reduce the non-uniform thermal expansion stress caused by the temperature difference between the inside and outside;

[0056] Moreover, the low thermal conductivity of oil (compared to metal) can block the conduction of external heat to the inner bellows 2. At the same time, the heat of the internal fluid must first pass through the metal wall of the inner bellows 2 and then be transferred to the vacuum chamber 15 through the oil, which significantly prolongs the thermal equilibrium time, reduces the risk of thermal shock, and extends the service life.

[0057] Kit 3 uses a metal braided mesh. When a metal braided mesh is used, the flexibility of the device is further increased. It should be understood that the density of the metal braided mesh is high and no gaps will be generated. Furthermore, 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.

[0058] A second filling cavity 17 is formed between the first sliding sleeve 203, the second sliding sleeve 206 and the inner layer bellows 2, and the second filling cavity 17 is filled with oil;

[0059] The oil in the second filling chamber 17 can improve the sliding smoothness of the first sliding sleeve 203 and the second sliding sleeve 206 to avoid jamming, and secondly can also improve the protection of the inner layer bellows 2.

[0060] Example 4: Reference Figure 7 A composite vacuum metal hose is substantially the same as that of Example 3, except that: a discharge pipe 4 is mounted on the outer diameter of the outer connecting pipe 11, the discharge pipe 4 is connected to the vacuum chamber 15, and an elastic sealing cap 41 is rotatably mounted on one end of the discharge pipe 4;

[0061] The elastic cover 41 is tightly attached to the discharge pipe 4 by a torsion spring or other elastic structure. When the inner bellows 2 and the sleeve 3 rupture, the fluid medium will enter the vacuum chamber 15. When the pressure of the fluid medium is lower than the pressure of the elastic cover 41 on the discharge pipe 4, the fluid medium will not leak out, allowing the device to continue to be used.

[0062] When the pressure in the vacuum chamber 15 is greater than the pressure exerted by the elastic sealing cover 41 on the discharge pipe 4, a gap is generated between the elastic sealing cover 41 and the discharge pipe 4, and the internal oil leaks out from the discharge pipe 4, thereby serving as a warning of fluid medium leakage.

[0063] Furthermore, the vacuum chamber 15 is filled with oil that occupies 25%-30% of the volume of the vacuum chamber 15. When the inner bellows 2 and the kit 3 rupture, the oil in the first filling chamber 16 and the second filling chamber 17 enters the vacuum chamber 15, so that the proportion of oil in the vacuum chamber 15 increases. At this time, when the fluid medium leaks into the vacuum chamber 15, most of the oil in the vacuum chamber 15 needs to be discharged through the discharge pipe 4 before the fluid medium can leak out, thereby effectively slowing down the leakage of the fluid medium.

[0064] Example 5: Reference Figure 6 A composite vacuum metal hose is substantially the same as that of Example 4, except that: a connecting ring 13 is fixedly connected to each of the two outer connecting tubes 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;

[0065] The provision of the buffer spring 132 can improve the dynamic adjustment capability of the outer layer bellows 12 .

[0066] Example 6: Reference Figure 7 A composite vacuum metal hose is substantially the same as that of Example 3, with the further feature that: an extension tube 18 is fixedly connected to one end of the second sliding sleeve 206 near the adjustment zone 5, one end of the extension tube 18 passes through the adjustment zone 5 and enters the first sliding sleeve 203, a gap is left between the outer diameter of the extension tube 18 extending into the first sliding sleeve 203 and the inner diameter of the first sliding sleeve 203, and an anti-fluid buffer zone 181 is formed between the extension tube 18 and the adjustment zone 5;

[0067] The extension tube 18 is provided so that when the fluid medium passes through the inner layer bellows 2, the resistance generated by the inner wall of the inner layer bellows 2 to the fluid medium is further reduced, so that the fluid medium passes through more efficiently;

[0068] The gap between the outer diameter of the extension tube 18 and the inner diameter of the first sliding sleeve 203 allows the fluid medium to enter the regulating area 5, so that the regulating area 5 continues to function;

[0069] The setting of the anti-fluid buffer zone 181 can allow the fluid medium flowing back in the opposite direction to enter the anti-fluid buffer zone 181 for buffering when the fluid medium is cut off, thereby avoiding excessive impact on the inner layer bellows 2.

[0070] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been described above with reference to a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A composite vacuum metal hose, comprising an outer layer corrugated tube (12) with outer layer connecting tubes (11) connected at both ends, characterized in that: Also includes: Flanges (1) are respectively connected to the two outer connecting pipes (11), and the two flanges (1) located at both ends are respectively connected to the first connecting pipe (21) and the second connecting pipe (22); An inner layer corrugated tube (2), both ends of which are connected to the first connecting tube (21) and the second connecting tube (22) respectively; A set (3) is sleeved on the inner layer corrugated tube (2), and two ends of the set (3) are respectively connected to the first connecting tube (21) and the second connecting tube (22); A vacuum chamber (15) located between the outer bellows (12) and the sleeve (3); A first sliding sleeve (203) and a second sliding sleeve (206) are respectively arranged in the inner layer bellows (2) to dynamically adjust the pressure in the inner layer bellows (2); The inner diameter of the second channel (213) opened in the first connecting tube (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); A spiral groove (212) is formed on the inner wall of the first channel (211) in the first connecting tube (21); A first filling cavity (16) is formed between the sleeve (3) and the inner layer bellows (2), and the first filling cavity (16) is filled with oil; A second filling cavity (17) is formed between the first sliding sleeve (203), the second sliding sleeve (206) and the inner layer bellows (2), and the second filling cavity (17) is filled with oil.

2. A composite vacuum metal hose according to claim 1, characterized in that: The first sliding sleeve (203) and the second sliding sleeve (206) are respectively provided with a step end ring (205) and a convex ring (204) at both ends. The first sliding sleeve (203) and the second sliding sleeve (206) are both limited in the groove (202) of the inner layer corrugated tube (2) by the convex ring (204). The first sliding sleeve (203) and the second sliding sleeve (206) are both slid in the corresponding first connecting tube (21) and the second connecting tube (22) through the step end ring (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 (203) and the second sliding sleeve (206), and a first smoothing area (6) and a second smoothing area (7) are respectively formed in the inner layer corrugated tube (2) of the first sliding sleeve (203) and the second sliding sleeve (206).

4. The composite vacuum metal hose according to claim 3, characterized in that: 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 step end ring (205) of the second sliding sleeve (206) and the second clamping end (201) of the inner layer bellows (2).

5. The composite vacuum metal hose according to claim 1, characterized in that: A discharge pipe (4) is mounted on the outer diameter of the outer connecting pipe (11), the discharge pipe (4) is connected to the vacuum chamber (15), and an elastic sealing cover (41) is rotatably mounted on one end of the discharge pipe (4).

6. The composite vacuum metal hose according to claim 2, characterized in that: A connecting ring (13) is fixedly connected to each of the two outer connecting tubes (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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