Integrated pressure protection double-layer corrugated pipe vibration reduction pipe and using method thereof

Abstract

The invention provides an integrated pressure protection double-layer corrugated pipe vibration reduction pipe, and belongs to the field of vibration absorbers. An interlayer cavity is formed in the pipe wall of the vibration reduction pipe; gap grooves are formed in the middles of the outer end faces of the flange plates, so that steps are formed on the outer end faces of the flange plates around the edge portions of the gap grooves, and inlet holes and outlet holes are formed in the gap grooves of the two flange plates respectively. The safety valve and the one-way valve are arranged in the interlayer cavity and connected to the inlet hole and the outlet hole, the safety valve allows or limits the medium to enter the interlayer cavity through the inlet hole according to whether the external pressure exceeds the preset pressure, and the one-way valve limits the medium to flow out of the interlayer cavity only through the outlet hole. The safety valve is arranged, so that a medium in the inner layer of the pipeline enters the interlayer cavity, the pressure value in the inner layer of the pipeline is reduced, the pressure of the medium is prevented from exceeding the yield limit of an inner-layer corrugated pipe material, and the medium entering the interlayer cavity can flow back to a low-pressure area through the one-way valve; and the safety and the reliability of the double-layer corrugated pipe vibration reduction pipeline are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shock absorbers, in particular to an integrated pressure protection double-layer bellows shock absorber and a use method thereof. BACKGROUND

[0002] As a commonly used pipe component, bellows are widely used in military ships, petrochemical industry, water conservancy, power and other industries. Traditional bellows are usually single-layer structures, which have poor resilience, are prone to breakage after long-term use, and have poor damping effect and short service life. Double-layer bellows are formed by sleeving two groups of single-layer bellows together, which have higher displacement compensation capacity, high strength and better flexibility, and are an important component in ship pipeline systems.

[0003] When high-pressure medium passes through the double-layer bellows, the inner layer bellows is subjected to a large load, which causes excessive deformation and damage, resulting in loss of function of the system pipe and failure to realize flow and damping functions, and even damage to the device. Chinese patent CN105135085A discloses a double-layer bellows pipe which is integrally formed, but has poor maintainability, and no pressure protection device in the device, which cannot realize pressure protection of the inner layer bellows pipe. The double-layer bellows pipe disclosed in Chinese patent CN209434323U uses a bursting diaphragm to achieve pressure protection, but the bursting diaphragm is difficult to reuse after bursting, and cannot realize multiple opening and closing functions with the change of internal pressure of the bellows, so it cannot realize the fluid on-off function between the two layers of the double-layer bellows pipe, and further realize the main functions of flow and damping. Therefore, the existing double-layer bellows pipe cannot balance the damping effect and structural safety. SUMMARY

[0004] Therefore, the present application provides an integrated pressure protection double-layer bellows shock absorber and a use method thereof.

[0005] The technical scheme of the present application is as follows: The present application provides an integrated pressure protection double-layer bellows shock absorber, which comprises a flange, a safety valve and a check valve, and a cladding cavity is arranged in the pipe wall of the shock absorber; two flanges are arranged at the two ends of the shock absorber, a gap groove is formed in the middle of the outer end face of the flange, the edge part of the outer end face of the flange around the gap groove forms a step, an inlet hole and an outlet hole are respectively arranged in the gap grooves of the two flanges, and the inlet hole and the outlet hole are in communication with the cladding cavity; the safety valve is arranged in the cladding cavity and connected to the inlet hole, the safety valve has a preset pressure, and the safety valve allows or limits the medium to pass through the inlet hole and enter the cladding cavity according to whether the external pressure exceeds the preset pressure; the check valve is arranged in the cladding cavity and connected to the outlet hole, and the check valve limits the medium to flow out of the cladding cavity only through the outlet hole.

[0006] On the basis of the above technical scheme, preferably, the outer tube and the inner tube are further included, the inner tube is sleeved in the outer tube, and a gap is left between the outer wall of the inner tube and the inner wall of the outer tube; the flange plate is sleeved on the end of the inner tube, and the end face of the flange plate facing the inner tube abuts against the end of the outer tube, and the flange plate, the outer tube and the inner tube form a sandwich cavity.

[0007] Further preferably, the first valve seat and the second valve seat are further included, the end face of each of the two flange plates facing the outside is provided with a first installation groove and a second installation groove, and the first installation groove and the second installation groove are located in the gap groove; the first valve seat and the second valve seat are arranged in the first installation groove and the second installation groove respectively, the first valve seat is provided with an inlet hole, and a safety valve is arranged on the first valve seat; the second valve seat is provided with an outlet hole, and a one-way valve is arranged on the second valve seat.

[0008] Further preferably, the end face of the first valve seat or the second valve seat facing the outside is flush with the groove bottom surface of the gap groove.

[0009] Further preferably, at least three first valve seats or second valve seats are arranged on the flange plate around the central axis of the inner tube, and at least three safety valves are arranged, and the preset pressures of the safety valves are arranged in a gradient.

[0010] Further preferably, the filter is further included, the filter is arranged between the first valve seat and the safety valve, and the filter is connected between the inlet hole and the safety valve.

[0011] On the basis of the above technical scheme, preferably, the two ends of the damping tube are respectively connected and communicated with two connecting pipes, and the connecting parts of the connecting pipes and the damping tube are provided with flange parts; the flange plate abuts against the flange parts through the step, so that the flange parts and the flange plate form a gap groove.

[0012] Further preferably, the sealing ring is further included, the sealing groove is arranged on the step around the gap groove; the sealing ring is tightly filled in the sealing groove, so that the part where the flange part abuts against the flange plate forms a sealing structure, and the sealing groove is sealed and isolated from the outside environment.

[0013] On the basis of the above technical scheme, preferably, the height of the step is not greater than 5mm.

[0014] In another aspect, the application also provides a method for using the integrated pressure protection double-layer corrugated pipe shock absorber, which adopts the integrated pressure protection double-layer corrugated pipe shock absorber, and comprises the following steps: step one, two connecting pipes are connected to and communicated with two ends of the shock absorber respectively, and the connecting pipes and the shock absorber are flowed through by a medium; step two, when the internal pressure of the shock absorber is lower than the preset pressure of the safety valve, the safety valve limits the medium flowed through the shock absorber to enter the interlayer cavity through the inlet hole; when the internal pressure of the shock absorber exceeds the preset pressure of the safety valve, the safety valve allows the medium flowed through the shock absorber to enter the interlayer cavity through the inlet hole, and gradually reduces the internal pressure of the shock absorber; and step three, when the internal pressure of the shock absorber is reduced to below the preset pressure of the safety valve, and the internal pressure of the interlayer cavity is lower than the internal pressure of the shock absorber, the medium in the interlayer cavity flows out through the outlet hole and returns to the shock absorber.

[0015] The integrated pressure protection double-layer corrugated pipe shock absorber and the method for using the same have the following beneficial effects relative to the prior art: (1) The shock absorber adopts a double-layer corrugated pipe mode, the pipeline structure has good axial and radial displacement compensation capability and good structural strength, can compensate the structural hard impact caused by the displacement change of the external pipeline in the working process, has a shock absorption effect and also has a good structural stability effect; the safety valve and the one-way valve are arranged in the interlayer cavity, can open the safety valve to make the medium in the inner layer of the pipeline enter the interlayer cavity when the pressure in the inner layer of the pipeline exceeds a safety threshold, reduce the pressure value in the inner layer of the pipeline, prevent the medium pressure from exceeding the yield limit of the inner layer corrugated pipe material, improve the safety and reliability of the double-layer corrugated pipe shock absorber pipeline, and the medium entering the interlayer cavity can also flow back to the low-pressure area through the one-way valve, thereby improving the working reliability of the integrated pressure protection double-layer corrugated pipe shock absorber pipeline module.

[0016] (2) The three groups of safety valves and one-way valves are arranged in the shock absorber, the three groups of safety valves can be set to three pressure values according to the requirements, can be operated independently and simultaneously serve as standby for each other, can increase the application range of the integrated pressure protection double-layer corrugated pipe shock absorber pipeline module; the three groups of one-way valves are arranged in the module, the fluid in the pipeline interlayer flows out in time, and the working reliability of the integrated pressure protection double-layer corrugated pipe shock absorber pipeline module is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0018] Figure 1A side view of the damping pipe of the present application; Figure 2 A side view of the first valve seat of the present application; Figure 3 A front view of the flange plate of the present application.

[0019] In the figure: 1, flange plate; 11, step; 100, interlayer cavity; 101, gap groove; 102, first mounting groove; 103, second mounting groove; 104, sealing groove; 2, safety valve; 21, first valve seat; 201, inlet hole; 3, check valve; 31, second valve seat; 301, outlet hole; 4, outer pipe; 5, inner pipe; 6, filter; 7, sealing ring; 8, connecting pipe; 81, flange part. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] As Figure 1 shown, in combination Figure 2 , an integrated pressure protection double-layer corrugated pipe damping pipe of the present application comprises a flange plate 1, a safety valve 2 and a check valve 3.

[0022] Among them, the damping pipe road body of the present application adopts a double-layer corrugated pipe wall structure with an inner and outer sleeve, and the pipe wall of the damping pipe is provided with an interlayer cavity 100. The double-layer corrugated pipe damping pipe road has good coaxiality, facilitating connection with external pipelines. The double-layer corrugated pipe has good axial and radial displacement compensation capacity and good structural strength. In the working process of the pipeline, the double-layer corrugated pipe structure design can compensate the structural hard impact caused by the displacement change of the external pipeline, has a damping effect and also has a good structural stability effect.

[0023] Two flange plates 1 are arranged at both ends of the damping pipe, a gap groove 101 is formed in the middle of the outer end face of the flange plate 1, the gap groove 101 is connected with the inside of the damping pipe, at the same time, the edge part of the outer end face of the flange plate 1 around the gap groove 101 forms a step 11, an inlet hole 201 and an outlet hole 301 are respectively formed in the gap grooves 101 of the two flange plates 1, and the inlet hole 201 and the outlet hole 301 are both connected with the interlayer cavity 100.

[0024] The safety valve 2 is arranged in the interlayer cavity 100 and connected to the inlet hole 201. The safety valve 2 has a preset pressure. The safety valve 2 allows or limits the medium to enter the interlayer cavity 100 through the inlet hole 201 according to whether the external pressure exceeds the preset pressure. The safety valve 2 is a special valve that is in a normally closed state under the action of external force, and prevents the medium pressure in the pipeline or equipment from exceeding the specified value by discharging the medium outside the system when the medium pressure in the equipment or pipeline rises above the specified value. The safety valve 2 belongs to the automatic valve type.

[0025] The one-way valve 3 is arranged in the interlayer cavity 100 and connected to the outlet hole 301. The one-way valve 3 limits the medium to flow out of the interlayer cavity 100 only through the outlet hole 301. The one-way valve 3 is also called a check valve or a non-return valve, which is used to prevent the medium from flowing in the opposite direction or backflowing in the reverse direction in the pipeline system.

[0026] When the internal pressure of the damping pipe is lower than the preset pressure of the safety valve 2, the safety valve 2 limits the medium flowing through the damping pipe to enter the interlayer cavity 100 through the inlet hole 201. When the internal pressure of the damping pipe exceeds the preset pressure of the safety valve 2, the safety valve 2 allows the medium flowing through the damping pipe to enter the interlayer cavity 100 through the inlet hole 201, and gradually reduces the internal pressure of the damping pipe. When the internal pressure of the damping pipe is reduced to below the preset pressure of the safety valve 2, and the internal pressure of the interlayer cavity 100 is lower than the internal pressure of the damping pipe, the medium in the interlayer cavity 100 flows out through the outlet hole 301 and returns to the damping pipe. The safety valve 2 can be opened when the pressure in the inner layer of the pipeline exceeds the safety threshold, so that the medium in the inner layer of the pipeline enters the interlayer cavity 100, thereby reducing the pressure value in the inner layer of the pipeline, preventing the medium pressure from exceeding the yield limit of the inner layer of the corrugated pipe, and improving the safety and reliability of the double-layer corrugated pipe damping pipeline.

[0027] In Figure 1 In a preferred embodiment shown in the drawings, in order to form the specific structure of the double-layer corrugated pipe damping pipe main body, an outer pipe 4 and an inner pipe 5 are further included.

[0028] The outer pipe 4 and the inner pipe 5 are both corrugated pipes. The inner pipe 5 is sleeved in the outer pipe 4, and a space is left between the outer wall of the inner pipe 5 and the inner wall of the outer pipe 4.

[0029] A flange plate 1 is sleeved on the end of the inner pipe 5, and the end surface of the flange plate 1 facing the inner pipe 5 abuts against the end of the outer pipe 4. The flange plate 1, the outer pipe 4 and the inner pipe 5 enclose the interlayer cavity 100.

[0030] The outer tube 4 is in clearance fit with the flange plate 1, and the contact surface of the two is welded and connected; the inner tube 5 is installed in the middle inner hole of the flange plate 1 in small clearance fit, and the contact surface of the two is welded and connected. Through the above installation structure, the double-layer corrugated pipe damping pipe main body is constituted. In addition, in order to ensure the sealing performance of the damping pipe inside, the sealing ring 7 is arranged at the connecting part of the outer tube 4 and the flange plate 1 and the connecting part of the inner tube 5 and the flange plate 1.

[0031] In Figure 1 In a preferred embodiment shown in the drawings, in order to install the safety valve 2 and the check valve 3 on the flange plate 1, the first valve seat 21 and the second valve seat 31 are further included.

[0032] The first installation groove 102 and the second installation groove 103 are respectively arranged on the end surface of the two flange plates 1 facing the outside, and the first installation groove 102 and the second installation groove 103 are both located in the clearance groove 101, and the first installation groove 102 and the second installation groove 103 are both recessed grooves.

[0033] The first valve seat 21 and the second valve seat 31 are respectively arranged in the first installation groove 102 and the second installation groove 103 and are connected by bolts. The first valve seat 21 is provided with an inlet hole 201, the safety valve 2 is arranged on the first valve seat 21 and is threadedly connected, the second valve seat 31 is provided with an outlet hole 301, the check valve 3 is arranged on the second valve seat 31 and is threadedly connected, and the connecting part of the first valve seat 21 and the safety valve 2. Since both are installed in the recess, the medium entering the clearance groove 101 will not hinder the medium entering the inlet hole 201.

[0034] In Figure 2 In a preferred embodiment shown in the drawings, the end surface of the first valve seat 21 or the second valve seat 31 facing the outside is flush with the groove bottom surface of the clearance groove 101, so that the clearance groove 101 has enough space for the medium to flow in.

[0035] In Figure 3In a preferred embodiment shown, at least three first valve seats 21 or second valve seats 31 are arranged around the central axis of the inner tube 5 on the flange plate 1, and at least three safety valves 2 are provided, and the preset pressures of the safety valves 2 are arranged in a gradient. The three groups of safety valves 2 can be provided with three pressure values according to requirements, and the three groups of safety valves 2 can work independently and simultaneously as backup for each other, thereby increasing the application range of the integrated pressure protection double-layer corrugated damping pipe. When the pressure in the inner layer pipeline gradually increases and reaches the preset pressure values of the safety valves 2 in sequence, the safety valves 2 are opened in sequence to gradually increase the flow of the medium entering the interlayer cavity 100, thereby increasing the internal pressure value of the damping pipe and improving the efficiency of reducing the internal pressure value, which can effectively prevent the liquid medium pressure from exceeding the yield limit of the inner layer corrugated pipe, and improve the safety and reliability of the double-layer corrugated damping pipeline. At the same time, the uniform arrangement of the three groups of one-way valves 3 enables the medium in the interlayer cavity 100 to flow out in time, thereby further improving the working reliability of the integrated pressure protection double-layer corrugated damping pipe.

[0036] In Figure 2 In a preferred embodiment shown, a filter 6 is further included. The filter 6 is arranged between the first valve seat 21 and the safety valve 2, and the filter 6 is communicated between the inlet hole 201 and the safety valve 2. The filter 6 is used to filter the medium entering the interlayer cavity 100, so as to avoid the accumulation of impurities in the interlayer cavity 100 and weaken the performance of the damping pipe.

[0037] In Figure 2 In a preferred embodiment shown, two connecting pipes 8 are connected and communicated with the two ends of the damping pipe respectively, and a flange part 81 is arranged at the connecting part of the connecting pipe 8 and the damping pipe; the flange part 81 is abutted with the flange plate 1 through the step 11, so that the gap groove 101 is formed between the flange part 81 and the flange plate 1.

[0038] In Figure 3 In a preferred embodiment shown, a sealing ring 7 is further included. The sealing ring 7 is an O-ring.

[0039] The sealing groove 104 is arranged around the gap groove 101 on the step 11.

[0040] The sealing ring 7 is tightly filled in the sealing groove 104, and the sealing ring 7 is similar to covering the gap groove 101 located therein, so that a sealing structure is formed at the abutted part of the flange part 81 and the flange plate 1, and the sealing groove 104 is sealed and isolated from the external environment, thereby avoiding the leakage of the medium from the abutted part of the step 11 and the flange part 81 when the internal pressure of the damping pipe increases and the medium enters the gap groove 101.

[0041] In Figure 2In a preferred embodiment shown, the height of the step 11 is not more than 5 mm. The height of the step 11 should not be too small so as to make the thickness of the gap groove 101 too small, which in turn causes the medium to be hindered from entering the gap groove 101 due to surface tension and other factors. However, the height of the step 11 should not be too large so as to make the thickness of the gap groove 101 too large, which in turn causes the medium flow into the gap groove 101 to be too large and increases the risk of the medium leaking from the abutting part of the step 11 and the flange part 81.

[0042] As shown in Figure 1 combination Figure 2 , a method for using the integrated pressure protection double-layer corrugated pipe shock absorber according to the present application, which adopts the integrated pressure protection double-layer corrugated pipe shock absorber described above, comprises the following steps.

[0043] Step one, the two ends of the shock absorber are respectively connected and communicated with two connecting pipes 8, and the connecting pipes 8 and the shock absorber are flowed through by the medium.

[0044] Step two, when the internal pressure of the shock absorber is lower than the preset pressure of the safety valve 2, the safety valve 2 limits the medium flowed through the shock absorber to enter the interlayer cavity 100 through the inlet hole 201; when the internal pressure of the shock absorber exceeds the preset pressure of the safety valve 2, the safety valve 2 allows the medium flowed through the shock absorber to enter the interlayer cavity 100 through the inlet hole 201, and gradually reduces the internal pressure of the shock absorber.

[0045] Step three, when the internal pressure of the shock absorber is reduced to below the preset pressure of the safety valve 2, and the internal pressure of the interlayer cavity 100 is lower than the internal pressure of the shock absorber, the medium in the interlayer cavity 100 flows out through the outlet hole 301 and returns to the shock absorber.

[0046] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An integrated pressure protected double-wall corrugated vibration damper tube, characterized by: Including flange (1), safety valve (2) and check valve (3), The pipe wall of the damping pipe is provided with a sandwich cavity (100); Two said flange (1) is arranged at both ends of the damping pipe, the outer end surface of the flange (1) is provided with a gap groove (101) in the middle, the edge part of the outer end surface of the flange (1) around the gap groove (101) forms a step (11), the gap groove (101) of two said flange (1) is respectively provided with an inlet hole (201) and an outlet hole (301), the inlet hole (201) and the outlet hole (301) are communicated with the sandwich cavity (100); The safety valve (2) is arranged in the sandwich cavity (100) and connected to the inlet hole (201), the safety valve (2) has a preset pressure, and the safety valve (2) allows or limits the medium to enter the sandwich cavity (100) through the inlet hole (201) according to whether the external pressure exceeds the preset pressure. The check valve (3) is arranged in the sandwich cavity (100) and connected to the outlet hole (301), and the check valve (3) limits the medium to flow out of the sandwich cavity (100) only through the outlet hole (301).

2. The integrated pressure protected double-wall corrugated tube damper of claim 1, wherein: Further comprising an outer pipe (4) and an inner pipe (5), The inner pipe (5) is sleeved in the outer pipe (4), and a space is left between the outer wall of the inner pipe (5) and the inner wall of the outer pipe (4); The flange (1) is sleeved on the end of the inner pipe (5), and the end surface of the flange (1) facing the inner pipe (5) abuts against the end of the outer pipe (4), and the flange (1), the outer pipe (4) and the inner pipe (5) form a sandwich cavity (100).

3. The integrated pressure protected double-wall corrugated tube damper of claim 2, wherein: Further comprising a first valve seat (21) and a second valve seat (31), The end surface of the two said flange (1) facing the outside is respectively provided with a first installation groove (102) and a second installation groove (103), and the first installation groove (102) and the second installation groove (103) are located in the gap groove (101); The first valve seat (21) and the second valve seat (31) are arranged in the first installation groove (102) and the second installation groove (103) respectively, the inlet hole (201) is arranged on the first valve seat (21), the safety valve (2) is arranged on the first valve seat (21), the outlet hole (301) is arranged on the second valve seat (31), and the check valve (3) is arranged on the second valve seat (31).

4. The integrated pressure protected double-wall corrugated tube damper of claim 3, wherein: The end surface of the first valve seat (21) or the second valve seat (31) facing the outside is flush with the groove bottom surface of the gap groove (101).

5. The integrated pressure protected double bellows vibration damper tube of claim 3, wherein: At least three first valve seats (21) or second valve seats (31) are arranged around the central axis of the inner pipe (5) on the flange (1), and at least three said safety valves (2) are arranged, and the preset pressures of the safety valves (2) are arranged in a gradient.

6. The integrated pressure protected double bellows vibration damper tube of claim 3, wherein: Further comprising a filter (6), the filter (6) is arranged between the first valve seat (21) and the safety valve (2), and the filter (6) is communicated between the inlet hole (201) and the safety valve (2).

7. The integrated pressure protected double bellows vibration damper tube of claim 1, wherein: Two connecting pipes (8) are respectively connected and communicated at both ends of the damping pipe, and a flange part (81) is arranged at the connecting part of the connecting pipe (8) and the damping pipe. The flange plate (1) is in abutment with the flange part (81) through the step (11), so that the gap groove (101) is formed between the flange part (81) and the flange plate (1).

8. The integrated pressure protected double-wall corrugated tube damper of claim 7, wherein: Further comprising a sealing ring (7), The step (11) is provided with a sealing groove (104) around the gap groove (101); The sealing ring (7) is tightly filled in the sealing groove (104), so that a sealing structure is formed at the abutment part between the flange part (81) and the flange plate (1), and the sealing groove (104) is sealed and isolated from the external environment.

9. The integrated pressure protected double bellows vibration damper tube of claim 1, wherein: The height of the step (11) is not greater than 5mm.

10. A method of using an integrated pressure-protected double-wall corrugated tube vibration damper, characterized by: The integrated pressure protection double-layer corrugated pipe shock absorber pipe, Comprising the following steps, Step one, two connecting pipes (8) are respectively connected to and communicated with two ends of the shock absorber pipe, and the connecting pipes (8) and the shock absorber pipe are flowed through by a medium; Step two, when the internal pressure of the shock absorber pipe is lower than the preset pressure of the safety valve (2), the safety valve (2) limits the medium flowed through the shock absorber pipe to enter the interlayer cavity (100) through the inlet hole (201); when the internal pressure of the shock absorber pipe exceeds the preset pressure of the safety valve (2), the safety valve (2) allows the medium flowed through the shock absorber pipe to enter the interlayer cavity (100) through the inlet hole (201), and gradually reduces the internal pressure of the shock absorber pipe; Step three, when the internal pressure of the shock absorber pipe is reduced to below the preset pressure of the safety valve (2), and the internal pressure of the interlayer cavity (100) is lower than the internal pressure of the shock absorber pipe, the medium in the interlayer cavity (100) flows out through the outlet hole (301) and returns to the shock absorber pipe.

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