Pipe wall, corrugated pipe, energy accumulator, suspension system, brake system and vehicle

Abstract

The utility model discloses a pipe wall, a corrugated pipe, an energy accumulator, a suspension system, a brake system and a vehicle, and belongs to the field of energy storage equipment. The pipe wall for manufacturing the corrugated pipe comprises a first side wall and a second side wall which are alternately arranged in the axial direction; and a connecting wall; the first side wall is connected with the second side wall through the connecting wall. A gap defined by the connecting wall is formed between the first side wall and the second side wall, and the gap is also associated with the shapes of the first side wall and the second side wall; when the pipe wall is compressed in the axial direction, the gap is reduced due to the fact that the first side wall and the second side wall get close to each other, and the first side wall and the second side wall have at least two point contact positions. The corrugated pipe provided by the utility model has better fatigue strength, so that the corrugated pipe can be used for a long time and has longer service life.

Description

Technical Field

[0001] The present application belongs to the field of energy storage equipment, and in particular, the present application relates to a pipe wall, a bellows, an accumulator, a suspension system, a brake system and a vehicle. Background Art

[0002] Bellows accumulators are used in hydraulic systems, for example, to reduce pressure peaks that may occur in the fluid in the hydraulic system or to make pressure changes more gradual. In some application fields, such as large-scale engineering machinery, the bellows accumulators used are usually required to work in a relatively high pressure environment, so it is hoped that they have as long a service life as possible. However, the known bellows accumulators do not meet these requirements. Utility Model Content

[0003] The object of the present application is to provide a pipe wall, a bellows, an accumulator, a suspension system, a brake system and a vehicle, so as to improve the service life of the bellows and products based thereon.

[0004] The solution of this application example is implemented through the following contents.

[0005] In a first aspect, the present application discloses a pipe wall for manufacturing a corrugated pipe.

[0006] The tube wall defines a channel extending in the axial direction and providing temporary storage or circulation for the fluid.

[0007] The cross-section of the pipe wall includes:

[0008] First side walls and second side walls arranged alternately in the axial direction; and

[0009] A connecting wall, the first side wall is connected to the second side wall via the connecting wall;

[0010] There is a gap between the first side wall and the second side wall defined by the connecting wall, and the gap is also associated with the shapes of the first side wall and the second side wall;

[0011] When the tube wall is compressed in the axial direction, the gap is reduced by the first side wall and the second side wall approaching each other, and there are at least two locations where the first side wall and the second side wall are in point contact.

[0012] In some examples of the present application, when the tube wall is compressed in the axial direction, the first side wall and the second side wall still have a surface contact area where the surface contacts each other, and the surface contact area is composed of various point contact positions that are continuously distributed.

[0013] In some examples of the present application, there are multiple surface contact areas, and the surface contact areas at each location are spaced apart from each other;

[0014] In some examples of the present application, there are multiple surface contact areas, and there is a non-contact position between two adjacent surface contact areas.

[0015] In some examples of the present application, when the tube wall is axially compressed, the first side wall and the second side wall further have a plurality of surface contact areas in surface contact, and the plurality of surface contact areas are spaced apart from each other by point contact positions.

[0016] In some examples of the present application, the tube wall is made of metal.

[0017] In some examples of the present application, the first side wall and the second side wall have the same length.

[0018] In some examples of the present application, the connecting wall is an arc-shaped structure. Optionally, the connecting wall is in the shape of a circular arc.

[0019] In some examples of the present application, the connection between the connecting wall and the first side wall is tangent. Alternatively, the connection between the connecting wall and the second side wall is tangent. Alternatively, the first side wall is a first arc structure; or the second side wall includes a plurality of sub-segments connected tangentially in sequence, each sub-segment is a second arc structure, and the radii of the sub-segments are different.

[0020] Optionally, the number of sub-segments is three, and they are the first sub-segment, the second sub-segment and the third sub-segment connected in sequence, wherein the arc length of the second sub-segment is greater than the arc length of the first sub-segment, and the arc length of the second sub-segment is greater than the arc length of the third sub-segment; optionally, the length of the first sub-segment is 1 / 3 of the length of the second side wall.

[0021] Optionally, a first distance is formed between the first subsection and the first side wall, a second distance is formed between the second subsection and the first side wall, and a third distance is formed between the third subsection and the first side wall, and the first distance, the second distance and the third distance increase sequentially.

[0022] In some examples of the present application, the first spacing remains consistent within the arc length of the first sub-segment; or, the second sub-segment and the first side wall have a consistent radius; or, the third sub-segment on both sides of the connecting wall forms a preset angle with the first side wall, and the preset angle is associated with the fatigue strength of the connecting wall connected to the first sub-segment.

[0023] In a second aspect, the present application discloses a device, comprising the above-mentioned tube wall, such device comprising a bellows, or an accumulator made using the bellows, or a suspension system or a brake system or a vehicle equipped with an accumulator.

[0024] In a third aspect, the present application discloses a corrugated tube having a main tube body, wherein the cross-sectional shape of the tube wall of the main tube body along the axial direction is given by a preset waveform.

[0025] The preset waveforms include:

[0026] A plurality of first side walls and second side walls are repeated alternately, and two ends of the first side wall are respectively connected to the wave trough and the wave crest, and two ends of the first side wall are respectively connected to the wave trough and the wave crest, the wave trough is close to the axis, and the wave crest is far from the axis;

[0027] The preset waveform is configured such that when the bellows is axially compressed, the first side wall and the second side wall cooperate in a surface contact manner.

[0028] According to some examples of the present application, the surface contact between the first side wall and the second side wall is generated in local areas of the first side wall and the second side wall;

[0029] And / or, both the wave crest and the wave trough are arc-shaped. Optionally, the first side wall and the second side wall form a preset angle at the connection point of the same wave trough.

[0030] According to some examples of the present application, the first side wall is a single arc segment, the second side wall is a single arc segment, and is composed of three arc sub-segments connected in sequence with smooth transitions; the connection between the first side wall and the wave crest and the wave trough is tangentially matched, and the connection between the second side wall and the wave crest and the wave trough is tangentially matched;

[0031] Optionally, the three arc sub-segments are arc A, arc B, and arc C which are distributed in sequence; wherein arc A is close to the wave crest, and arc C is close to the wave trough;

[0032] Further optionally, the arc length of arc A is equal to 1 / 3 of the total arc length of arc A, arc B, and arc C;

[0033] Further optionally, the arc length of the arc B is respectively greater than the arc length of the arc A and the arc length of the arc C, and optionally, the arc B is equal to the radius of a single arc segment;

[0034] Further optionally, arc A is parallel to a single arc segment;

[0035] Further optionally, the arc length of a single arc segment is equal to the total arc length of arc A, arc B, and arc C.

[0036] Beneficial effects:

[0037] The application discloses a corrugated pipe, a pipe wall for manufacturing the corrugated pipe, and a manufactured product using the corrugated pipe.

[0038] When the bellows is compressed in the axial direction, extrusion and friction will occur.

[0039] When using the tube wall and bellows structure in the present application, multiple contact positions can be formed on adjacent side walls when they are compressed axially, so that these contact positions can resist friction and extrusion forces, and the originally concentrated corresponding forces can be dispersed, thereby reducing the friction and extrusion effects at any contact position.

[0040] By dispersing the relatively concentrated force, and depending on the degree of compression, the positions of extrusion and friction can be shifted and switched at different contact positions, thereby avoiding continuous and frequent force on a single point position during repeated compression.

[0041] In this way, the service life of the bellows of the present application solution can be prevented from serious decline in a short period of time. In other words, compared with the single-point contact of adjacent side walls in the bellows during axial compression, the adjacent side walls (first side wall and second side wall) of the bellows in the present application example are configured in a multi-point or surface contact manner, so that such a bellows has a higher fatigue strength and a higher service life at least partially obtained thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] For a clearer explanation, the following briefly introduces the drawings required for the description.

[0043] Figure 1 A schematic diagram of a cross-sectional structure of a tube wall in a specific embodiment of the present application;

[0044] Figure 2 for Figure 1 A partial enlarged view of part A in FIG.

[0045] Figure 3 for Figure 1 A line drawing of the trajectory of the tube wall in a local area is shown;

[0046] Figure 4 The example records Figure 1 A schematic cross-sectional view of a structure connecting a pipe wall base and an assembly wall;

[0047] Figure 5 Public Figure 4 The bellows formed by the combination of the tube wall and the assembly wall shown is in the original length state, the compressed state and the partial enlarged view of the compressed state;

[0048] Figure 6 Records include mounting walls, and Figure 1 Schematic diagram of the structure of the corrugated tube with a tube wall shown in three viewing angles.

[0049] Explanation of reference numerals: 100 - tube wall; 201 - first side wall; 202 - second side wall; 203 - wave valley; 204 - wave peak; 301 - first sub-segment; 302 - second sub-segment; 303 - third sub-segment; 401 - assembly wall. DETAILED DESCRIPTION

[0050] As is known, a bellows is an elastic element that is retractable along the axial folding direction. Bellows are widely used in pressure measurement, medium transportation, power threading, etc. Bellows can achieve displacement compensation through axial (lateral) expansion and contraction, radial (longitudinal) bending deformation, and a combination of the two. In addition, it also has the characteristics of excellent structural strength and fatigue resistance.

[0051] In particular, bellows are also used as accumulators in vehicles and engineering machinery. When used as an accumulator, the bellows can buffer the impulse force in the system. When used as an accumulator, the bellows can be configured in a manner that one end of the axial direction is fixed and the other end is free.

[0052] During operation, under the pressure of the liquid, air or other fluid inside the bellows, the bellows can be stretched along its length / axial direction, causing the movable end / free end of the bellows to produce a displacement that is related to the pressure. On the other hand, the bellows can also be shortened along its length / axial direction under the pressure acting on the free end, so that the movable end / free end of the bellows produces a displacement that matches it. The fluid inside the bellows can resist the pressure acting on the free end, thereby playing a buffering role.

[0053] As mentioned above, during the compression process of the bellows, when an appropriate amount of compression is reached, adjacent pleat units of the wall of the bellows may come into contact with each other, and extrusion and possible friction may also occur.

[0054] Accordingly, when the axial compression force of the bellows is weakened or disappears, the bellows may rebound, so that the contact parts of the aforementioned pleated units are separated from each other. And the rebound may be generated by the pleated units and the connecting parts therebetween.

[0055] Furthermore, when the bellows is further stretched in the axial direction or elongated due to the rebound force after returning to its original length, the aforementioned connecting portion can generate a force to resist such elongation.

[0056] In actual operation, the bellows will frequently undergo the above-mentioned compression, free rebound, or controlled stretching actions, and in this process, the pleated units will correspondingly undergo frequent friction and extrusion actions, thereby being subjected to corresponding friction and extrusion forces, etc. At the same time, the connecting parts between the pleated units will also frequently undergo bending actions, thereby being subjected to bending moments, etc.

[0057] Based on the above situation, under high-intensity operating conditions, the bellows is prone to fatigue, causing it to reach its designed service life in a short time, or causing its service life to be significantly shortened.

[0058] Therefore, how to design the fatigue strength of the bellows is very important.

[0059] Based on such practical needs, the inventors of the present application have examined some known bellows in their practice and research. Referring to the above-mentioned related description, the structure of the bellows may include a pleated unit and a connecting portion between two adjacent pleated units.

[0060] The inventor unexpectedly discovered that when the existing bellows is axially compressed, the contact position of the pleated unit is a single point. When the bellows is working continuously, the single point contact position will be subjected to a large and long-term extrusion and friction force, so that the fatigue strength of the bellows is very limited and the service life is relatively short.

[0061] Therefore, in the examples of this application, the inventors have proposed a solution that overcomes or at least improves this problem. The solution will be described in detail below, and please refer to Figures 1 to 6 shown.

[0062] Since there may be many specific manufacturing methods for a bellows, the inventor has constructed a pipe wall 100 that can be used to manufacture a bellows. The pipe wall 100 can constitute one or more pipe sections of the bellows, and these pipe sections can be connected using straight pipes, other valves or multi-way pipes.

[0063] Furthermore, according to the application field, the specific type of manufactured products, etc., the pipe wall 100 can also be manufactured into a corresponding corrugated pipe structure in various appropriate structures and forms.

[0064] In terms of material, the tube wall 100 can be made of metal or the like.

[0065] Structurally, the tube wall 100 is a tubular structure, which defines a channel extending in the axial direction for temporary storage or circulation of fluid. For example, when the tube wall 100 is applied to a bellows and used as a component of an accumulator, the channel can be used as a chamber for containing gas or liquid.

[0066] In the example, Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 shown.

[0067] Figure 1 A schematic diagram of the axial cross-sectional structure of the tube wall 100 is disclosed. Figure 2 Recorded Figure 1 A partial enlarged view of part A. Figure 3 To intercept Figure 2 Line drawing of the middle part of the trajectory.

[0068] like Figure 1 , Figure 2 and Figure 3 As shown, the tube wall 100 includes a first side wall 201 and a second side wall 202 , and the first side wall 201 and the second side wall 202 are connected by a connecting wall.

[0069] Depending on the length of the tube wall 100 along the axial direction, the number of the first side walls 201 and the second side walls 202 can be selected accordingly without any particular limitation; accordingly, the number of the connecting walls is also selected. Figure 3 In the embodiment, the first side walls 201 have 5, the second side walls 202 have 4, and the connecting walls have 8. The connecting walls are distinguished according to the crests and troughs mentioned later, so the crests have 4 and the troughs have 5.

[0070] In the tube wall 100, the first side wall 201 and the second side wall 202 are arranged alternately along the axial direction. Correspondingly, the connecting wall is located between the first side wall 201 and the second side wall 202. In addition, the two ends (axial direction) of the first side wall 201 are respectively connected to a connecting wall; at the same time, the two ends (axial direction) of the second side wall 202 are respectively connected to a connecting wall.

[0071] In the original state of the tube wall 100 or its manufactured product such as a corrugated tube, there is a gap defined by the connecting wall between the first side wall 201 and the second side wall 202 , and the gap is also associated with the shapes of the first side wall 201 and the second side wall 202 .

[0072] For example, when the first side wall 201 and the second side wall 202 are straight walls, the gap can be determined by the axial length of the connecting wall and is a constant value. When the first side wall 201 and the second side wall 202 are curved walls (single or multiple arc structures in the illustrated structure of the present application), the gap can be determined by the axial length of the connecting wall and the shape of the side wall, and the gap varies with the shape of the side wall.

[0073] In the example of the present application, when the tube wall 100 is compressed in the axial direction, the above-mentioned gap is reduced by the first side wall 201 and the second side wall 202 approaching each other, and when the side walls are in contact during compression, there are at least two point contact positions between the first side wall 201 and the second side wall 202. These point contact positions can jointly and alternately bear and share the applied extrusion and friction forces.

[0074] In an application example, the tube wall 100 can be used as a part of a corrugated tube. For example, the tube wall 100 can be used as a main body of the corrugated tube. On this basis, for the convenience of discussion and description, the cross-sectional shape of the tube wall 100 of the main body along the axial direction has a preset waveform. In other words, the tube wall 100 can be formed into the shape of the tube wall 100 by rotating 360 degrees through a rotation axis coaxial with the axial direction using the preset waveform as a template.

[0075] In the example, the preset waveform includes a plurality of first side walls 201 and second side walls 202 that are repeated alternately. Accordingly, the connecting wall connecting the first side wall 201 and the second side wall 202 can be described as a wave crest 204 and a wave trough 203. That is, the two ends of the first side wall 201 are respectively connected to the wave trough 203 and the wave crest 204, and the two ends of the first side wall 201 are respectively connected to the wave trough 203 and the wave crest 204. As a distinction, the wave trough 203 is close to the axis, and the wave crest 204 is far away from the axis. As far as the bellows is concerned, its inner diameter is defined by the wave trough 203, and its outer diameter is defined by the wave crest 204.

[0076] In some examples, when the tube wall 100 is axially compressed, there may be at least two point contact positions between the adjacent first side wall 201 and the second side wall 202. In other examples, for example, in the tube wall 100 defined by the aforementioned preset waveform, when the corrugated tube is axially compressed, the first side wall 201 and the second side wall 202 may also cooperate in a surface contact manner.

[0077] In different examples, the point contact positions and the surface contact positions may be configured in different ways.

[0078] In one example, the surface contact area is composed of point contact positions that are continuously distributed. When there are enough point contact positions, multiple surface contact areas can be formed by these point contact positions. That is, there are multiple surface contact areas. In some examples, the surface contact areas at each location can be spaced apart from each other, and there can be non-contact areas between the surface contact areas.

[0079] In other examples, the point contact position is different from the surface contact position; or the surface contact position is not composed of the above-mentioned point contact positions. That is, the above-mentioned point contact position is recorded as the first point contact, and the points constituting the surface contact area can be recorded as the second point contact.

[0080] Therefore, as an example, when the tube wall 100 is compressed in the axial direction, the first side wall 201 and the second side wall 202 have both point contact positions and multiple surface contact areas of surface contact. Moreover, these surface contact areas may be separated from each other by the second point contact.

[0081] In addition, structurally speaking, the first side wall 201 and the second side wall 202 in the tube wall 100 can be constructed in various appropriate structural forms to achieve the effect of forming a surface contact position or multiple point contact positions, thereby increasing the service life of the corrugated tube and its manufactured products.

[0082] In addition, while providing a surface contact area and multiple point contact positions, it is also possible to consider increasing the compression and stretching of the tube wall 100 or a manufactured product such as a corrugated tube.

[0083] For example, the connecting wall (wave crest 204, wave trough 203) may be designed as an arc-shaped structure, or in a more specific example, may be in the shape of a circular arc.

[0084] Furthermore, the first side wall 201 and the second side wall 202 may be designed to be arc-shaped or circular-arc-shaped. In the aforementioned case, the connection between the connecting wall and the first side wall 201 may be designed to be tangent, and the connection between the connecting wall and the second side wall 202 may be designed to be tangent. That is, in terms of the preset waveform, the first side wall 201 and the second side wall 202 are both tangent to the wave crest 204 and the wave trough 203. In this way, it is helpful to transmit the force on the tube wall 100 and control the original axial length of the tube wall 100.

[0085] In some examples, the unfolded lengths of the first side wall 201 and the second side wall 202 can be made equal. In this way, after the bellows is compressed, the fit between the first side wall 201 and the second side wall 202 is better (greater surface contact can be achieved). In this way, the compression capacity of the bellows is significantly improved; at the same time, point-to-point relative friction is eliminated, so as to significantly increase the service life.

[0086] As a further optimization example, the first side wall 201 can be designed as a whole arc, that is, a single arc segment (or described as a first arc). The second side wall 202 can be designed as a combination structure of multiple arcs, that is, the second side wall 202 is a single arc segment and is composed of multiple arcs.

[0087] In a specific example, the second side wall 202 includes a plurality of sub-segments connected tangentially in sequence, more specifically, three sub-segments, each of which can be described as a second arc structure, and the radius of each sub-segment is configured to be different.

[0088] For the convenience of discussion, the three subsections of the second side wall 202 are respectively a first subsection 301 , a second subsection 302 , and a third subsection 303 which are connected in sequence.

[0089] In different examples, the three sub-segments may be designed in different structures.

[0090] For example, the arc length of the second sub-segment 302 is greater than the arc length of the first sub-segment 301, and the arc length of the second sub-segment 302 is greater than the arc length of the third sub-segment 303. Preferably, the length of the first sub-segment 301 is 1 / 3 of the length of the second side wall 202, and the number of times the bellows is continuously compressed under normal service conditions can be significantly increased.

[0091] In other examples, the distance between the first side wall 201 and the second side wall 202 may be appropriately designed. For example, from the first sub-segment 301 to the third sub-segment 303, it can be considered that the distance between the first side wall 201 and the second side wall 202 gradually increases.

[0092] Alternatively, in another example, a first spacing is formed between the first subsection 301 and the first side wall 201, a second spacing is formed between the second subsection 302 and the first side wall 201, and a third spacing is formed between the third subsection 303 and the first side wall 201. On this basis, the first spacing, the second spacing, and the third spacing increase in sequence.

[0093] Preferably, the first spacing is kept consistent within the arc length of the first subsection 301. Therefore, it can be known that the first subsection 301 is substantially or nearly parallel to the first side wall 201. In this way, during the compression and extension process of the bellows, the force can be borne by the entire first subsection 301, thereby significantly increasing the fatigue strength of the bellows.

[0094] Alternatively, the second sub-segment 302 and the first side wall 201 may be designed to have a consistent radius, so that the first side wall 201 and the second side wall 202 fit better when the bellows is compressed.

[0095] In addition, the relative position of the third sub-segment 303 connected on both sides of the connecting wall and the first side wall 201 can be constrained to form a preset angle (such as an elevation angle) related to the fatigue strength of the connecting wall connected to the first sub-segment 301. In practice, a smaller preset angle will help improve the fatigue strength at the wave crest 204 (the connecting wall at that location).

[0096] Various suitable designs are described above with reference to the discussion of tube wall 100 .

[0097] In other examples, the second side wall 202 can also be discussed based on the aforementioned preset waveform, and the segmented combination of the second side wall 202 can also be described as arc A, arc B, and arc C; the three arcs can be smoothly connected and form a single arc segment. For example, arc A is close to the crest 204, and arc C is close to the trough 203. The first sub-segment 301 corresponds to arc A, the second sub-segment 302 corresponds to arc B, and the third sub-segment 303 corresponds to arc C.

[0098] Corresponding to the above content, the first side wall 201 and the second side wall 202 form a preset angle at the connection of the same trough 203; that is, the first side wall 201 and the second side wall 202 connected to the trough 203 on both sides form a preset angle, which is the elevation angle described in the drawings. The elevation angle can be obtained according to simulation or actual measurement, or optimized.

[0099] Optionally, the arc length of arc A is equal to 1 / 3 of the total arc length of arc A, arc B, and arc C. Designing the length of arc A can optimize the compression of the bellows, and when it reaches 1 / 3, a better compression effect can be achieved. Further, arc A is parallel to a single arc segment of the first side wall 201.

[0100] In addition, the arc length of arc B is the longest among arc A, arc B, and arc C, and arc B has the same radius as the single arc segment of the first side wall 201. In other cases, the arc length of the single arc segment can be designed to be equal to the total arc length of arc A, arc B, and arc C based on improving the fit between the first side wall 201 and the second side wall 202.

[0101] Through the above design, the bellows can obtain a higher durability and fatigue strength, and can form a surface contact area with multiple point contact positions when compressed, such as Figure 5 shown.

[0102] In the above discussion of the corrugated tube or its tube wall 100, the partial structure with corrugations is mainly discussed. In practical applications, the corrugated tube can be connected to other components or structures. Therefore, the tube wall 100 or the corrugated tube can be provided with an integral assembly wall 401, such as Figure 4 and Figure 6 shown.

[0103] The structure of a best embodiment realized by the inventor in practice is as follows.

[0104] The bellows has a shape defined by a hollow structure with a specified thickness (wall thickness) formed by rotating a curve 360 ​​degrees along a given axis.

[0105] The curve is composed of the wave crest 204 , the wave trough 203 , the first side wall 201 and the second side wall 202 .

[0106] The wave crest 204, the first side wall 201, the wave trough 203 and the second side wall 202 appear in sequence. That is, if the above trajectory is matched in a rectangular coordinate system, it can be considered that the trajectory forms a periodic waveform. And the waveform in one period is composed of the wave crest 204, the first side wall 201, the wave trough 203 and the second side wall 202.

[0107] The wave crest 204 and the wave trough 203 are both whole arcs. The first side wall 201 is a whole arc, and the second side wall 202 is three arcs (a, b, c) connected tangentially in sequence. The wave crest 204 and the wave trough 203 are tangentially connected to the first side wall 201 and the second side wall 202, respectively.

[0108] The first side wall 201 and the second side wall 202 have the same length. The length of the arc a is equal to 1 / 3 of the length of the second side wall 202 .

[0109] The arc a is parallel to the first side wall 201 ; the arc b has the same radius as the first side wall 201 ; and the arc c forms a preset angle with the first side wall 201 .

[0110] In the bellows of the best embodiment described above, since the sidewalls from the trough to the crests on both sides are extended in equal lengths, it can be ensured that the two sidewalls are optimally fitted after compression, and surface contact is achieved. On the one hand, the compression capacity of the bellows is significantly improved (large compression amount); on the other hand, point-to-point relative friction is eliminated, so as to significantly increase the life of the bellows.

[0111] Since a section of arc a of the crest is nearly parallel to the first side wall, during the compression and extension process, the fatigue position of the bellows is transferred from the tangent point of arc a and the crest to the entire arc of arc a, and the fatigue strength is significantly increased.

[0112] Experimental verification shows that the longer the arc length of arc a is, the more conducive it is to increasing the life, but the compression will be relatively smaller. In particular, when the arc length of arc a is close to one-third of the total length of the second side wall, a balance can be achieved between life and compression, making the use of the bellows optimal; for example, when the compression reaches more than 50%, the life test is carried out, and the results show that it can be repeatedly compressed hundreds of thousands of times (to prove fatigue strength).

[0113] At the same time, arc b is the longest part of the arcs (a, b, c) and has the longest deformation. When the arc radius of arc b is almost equal to the radius of the first side wall, the best fit between the first and second side walls can be ensured. In addition, the angle between the arc c of the second side wall and the first side wall is made as small as possible, so that the elevation angle between the two sides of the trough is as small as possible, which can increase the fatigue strength at the wave peak.

[0114] In order to determine its performance, a life test, also known as a durability test, is carried out on a life test bench.

[0115] According to the life test data record of the above bellows:

[0116] The free length of the bellows (i.e. the axial length of the bellows) is 100cm, and the maximum compression reaches 50%.

[0117] In addition, 5 bellows were taken and marked as 1, 2, 3, 4, and 5. The test was repeated switching between the compression state of 45% and the free state (not compressed, not stretched) by compression and release. The results are shown in Table 1 below.

[0118] Table 1

[0119]

[0120] The durability times refer to the number of times the bellows can be restored to a free state after being compressed to a specified amount. That is, if the durability times are exceeded, when the bellows is compressed to 45%, it cannot be restored to its original length in a free state after being released.

[0121] The endurance number can be used to characterize the fatigue strength of the bellows.

[0122] The compression amount = (the length of the bellows in the free state - the length of the bellows in the compressed state) / the length of the bellows in the free state.

[0123] Correspondingly, the performance of the bellows can also be measured by the stretching amount. Stretching amount = (length of the bellows in the stretched state - length of the bellows in the free state) / length of the bellows in the free state.

[0124] The ultimate performance of the bellows is determined through a large number of experiments. That is, the ultimate tensile strength and ultimate compression strength are determined through experiments. It can be confirmed through experiments that the bellows (tube wall 100) in the best embodiment has a maximum compression of 50% and a maximum tensile strength of 30%. The maximum tensile strength of some bellows in the prior art known to the inventors can only reach 20%.

[0125] As an application example of the above pipe wall 100 and bellows, a device is disclosed in the example, which is manufactured based on the front pipe wall 100 and bellows. As some examples, the device includes a bellows, or an accumulator made of a bellows, or a suspension system or brake system or vehicle equipped with an accumulator.

[0126] It is worth pointing out that, in the case of an accumulator and its manufacturing articles, a larger compression ratio / compression volume is usually required, so the bellows is preferably manufactured in the form of metal material and assembled or fitted into the corresponding equipment to form a corresponding device.

[0127] By the above method, the following can be manufactured: Figure 6 Bellows shown. Figure 6 The figure shows the structural schematic diagram of the bellows at three different perspectives.

[0128] The technical features in the above examples can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A pipe wall for manufacturing a corrugated pipe, wherein the pipe wall defines a channel extending in the axial direction and for temporarily storing or circulating a fluid, characterized in that: The cross section of the tube wall includes: First side walls and second side walls arranged alternately in the axial direction; and A connecting wall, wherein the first side wall is connected to the second side wall via the connecting wall; There is a gap between the first side wall and the second side wall defined by the connecting wall, and the gap is also associated with the shapes of the first side wall and the second side wall; When the tube wall is compressed in the axial direction, the gap is reduced by the first side wall and the second side wall approaching each other, and there are at least two points of contact between the first side wall and the second side wall; The connection between the connecting wall and the first side wall is tangent; The connection between the connecting wall and the second side wall is tangent; The first side wall is a first arc structure; The second side wall includes a plurality of sub-segments which are sequentially connected tangentially, each sub-segment is a second arc structure, and the radii of the sub-segments are different.

2. The tube wall according to claim 1, characterized in that When the tube wall is compressed in the axial direction, a surface contact area exists between the first side wall and the second side wall, and the surface contact area is composed of continuously distributed point contact positions.

3. The tube wall according to claim 2, characterized in that There are multiple surface contact areas, and each surface contact area is spaced apart from each other.

4. The tube wall according to claim 2, characterized in that There are multiple surface contact areas, and there is a non-contact position between two adjacent surface contact areas.

5. The tube wall according to claim 2, characterized in that When the tube wall is compressed in the axial direction, the first side wall and the second side wall further have a plurality of surface contact areas in surface contact, and the plurality of surface contact areas are spaced apart from each other by the point contact positions.

6. The tube wall according to claim 2, characterized in that The tube wall is made of metal.

7. The tube wall according to claim 2, characterized in that The first side wall and the second side wall have the same length.

8. The tube wall according to claim 1, characterized in that The connecting wall is an arc structure, and the connecting wall is in an arc shape; And / or, the maximum compression allowed by the bellows is 50%, and the maximum stretching is 20%.

9. The tube wall according to any one of claims 1 to 8, characterized in that The number of sub-segments is three, and they are a first sub-segment, a second sub-segment and a third sub-segment connected in sequence, wherein the arc length of the second sub-segment is greater than the arc length of the first sub-segment, and the arc length of the second sub-segment is greater than the arc length of the third sub-segment.

10. The tube wall according to claim 9, characterized in that The length of the first subsection is 1 / 3 of the length of the second side wall.

11. The tube wall according to claim 10, characterized in that A first distance is formed between the first subsection and the first side wall, a second distance is formed between the second subsection and the first side wall, and a third distance is formed between the third subsection and the first side wall. The first distance, the second distance and the third distance increase in sequence.

12. The tube wall according to claim 9, characterized in that The first spacing remains constant within the arc length of the first subsegment; Alternatively, the second subsegment has a consistent radius with the first side wall; Alternatively, the third subsections on both sides of the connecting wall form a preset angle with the first side wall, and the preset angle is associated with the fatigue strength of the connecting wall connected to the first subsection.

13. The tube wall according to claim 11, characterized in that The first spacing remains constant within the arc length of the first subsegment; Alternatively, the second subsegment has a consistent radius with the first side wall; Alternatively, the third subsections on both sides of the connecting wall form a preset angle with the first side wall, and the preset angle is associated with the fatigue strength of the connecting wall connected to the first subsection.

14. A corrugated tube, characterized in that: A tube wall according to any one of claims 1 to 13.

15. An accumulator, characterized in that: A bellows as claimed in claim 14.

16. A suspension system, characterized in that: An energy storage device as claimed in claim 15 is provided.

17. A braking system, characterized in that: An energy storage device as claimed in claim 15 is provided.

18. A vehicle, characterized in that: An energy storage device as claimed in claim 15 is provided.

Images