Membrane type vibration reduction connecting pipe of piston type self-balancing structure and design method of membrane type vibration reduction connecting pipe

Abstract

The invention discloses a membrane type vibration reduction connecting pipe of a piston type self-balancing structure and a design method thereof.The membrane type vibration reduction connecting pipe comprises a bag body flange, a membrane type bag body, an inner pressing disc, an outer pressing disc, a pipe body, an elastic connecting ring, a piston and a piston flange, one end of the bag body flange is used for being connected with an external pipeline, and the other end of the bag body flange is connected with the membrane type bag body; the membrane type capsule body is of an annular semi-arc structure, the inner side of the membrane type capsule body is connected with the inner pressing disc and the capsule body flange, the outer side of the membrane type capsule body is connected with the outer pressing disc and the pipe body, the inner pressing disc is connected with the elastic connecting ring, the elastic connecting ring is connected with the piston, and the piston is arranged in the piston flange in a sliding mode. One end of the piston flange is connected with the pipe body, and the other end of the piston flange is used for being connected with another external pipeline. The flexible connecting pipe has the advantages that the rigidity of the connecting pipe can be reduced while the balance requirement, the displacement compensation capability requirement and the working pressure requirement of the flexible connecting pipe are met, and the overall size of the connecting pipe can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline connection, in particular to a membrane type vibration reduction pipe with a piston type self-balancing structure and a design method thereof. Background Art

[0002] With the development of ship technology, the requirements for large-diameter, low-rigidity flexible pipes are constantly increasing. While meeting the balance requirements, displacement compensation capability requirements, and working pressure requirements of flexible pipes, the requirements for vibration reduction performance are also further improved.

[0003] The flexible pipes currently used in China are difficult to meet the above requirements, so it is urgent to develop flexible pipes with new structures to meet the above requirements, especially low-rigidity flexible pipes. In this regard, the applicant proposes a piston-type self-balancing structure membrane vibration reduction pipe and its design method to meet the above requirements. Summary of the invention

[0004] The object of the present invention is to provide a piston-type self-balancing structure membrane type vibration reduction pipe and a design method thereof, so as to solve the technical problems existing in the background technology.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A diaphragm-type vibration-damping connecting pipe of a piston-type self-balancing structure comprises a bladder flange, a diaphragm bladder, an inner pressure plate, an outer pressure plate, a tube body, an elastic connecting ring, a piston and a piston flange. One end of the bladder flange is used to connect to an external pipeline, and the other end is connected to the diaphragm bladder. The diaphragm bladder is an annular semicircular arc structure, whose inner ring is connected to the inner pressure plate and the bladder flange, and the outer ring is connected to the outer pressure plate and the tube body. The inner pressure plate is connected to the elastic connecting ring, and the elastic connecting ring is connected to the piston. The piston is slidably arranged inside the piston flange, and one end of the piston flange is connected to the tube body, and the other end is used to connect to another external pipeline.

[0007] Furthermore, the end of the bladder flange connected to the external pipe is provided with a first sealing structure and a first connecting mounting screw hole, and the end of the bladder flange connected to the membrane bladder is fastened with screws to connect the inner ring of the membrane bladder between the bladder flange and the inner pressure plate.

[0008] Furthermore, the outer ring of the membrane bladder is fastened between the outer pressure plate and the tube body by screw connection, wherein the membrane bladder is composed of an inner rubber layer, an aramid skeleton layer, an outer rubber layer, an outer fastening ring and an inner fastening ring, and is vulcanized into a whole by a vulcanization process.

[0009] Furthermore, the inner pressure plate is circumferentially distributed with a plurality of first optical holes and a plurality of first threaded holes, wherein the first optical holes are used for penetrating screws for connecting the inner pressure plate with the membrane-type capsule and the capsule flange, and the first threaded holes are used for penetrating screws for connecting the inner pressure plate with the elastic connecting ring.

[0010] Furthermore, the outer compression disc is provided with a plurality of second light holes distributed in the circumferential direction, and the second light holes are used for penetrating screws for connecting the outer compression disc with the membrane-type bladder body and the tube body.

[0011] Furthermore, the tube body and the piston flange are connected via screws, and at least one first sealing ring is provided between the tube body and the piston flange.

[0012] Furthermore, the elastic connecting ring comprises an inner connecting seat, an outer connecting seat and a cylinder, wherein the inner connecting seat is arranged at one end of the cylinder, and the outer connecting seat is arranged at the other end of the cylinder, and the inner connecting seat, the outer connecting seat and the cylinder are vulcanized into a whole through a vulcanization process;

[0013] The inner connecting seat is provided with a plurality of third light holes distributed in the circumferential direction, and the third light holes are used to penetrate screws for connecting the inner connecting seat and the inner clamping plate;

[0014] The outer connection seat is provided with a plurality of fourth light holes distributed in the circumferential direction, and the fourth light holes are used to penetrate screws for connecting the outer connection seat and the piston;

[0015] The cylinder is a rubber structure with an aramid skeleton layer, and is provided with a plurality of through holes in its circumference for allowing the fluid in the tube to pass through.

[0016] Furthermore, at least one second sealing ring is arranged between the inner ring of the piston and the piston flange, and at least one third sealing ring is arranged between the outer ring of the piston and the piston flange.

[0017] Furthermore, a second sealing structure and a second connecting mounting screw hole are provided at one end of the piston flange connected to the external pipeline, and an annular groove is provided at one end of the piston flange connected to the tube body, and the annular groove is used to accommodate the piston.

[0018] A method for designing a diaphragm type vibration damping pipe of a piston type self-balancing structure, which is used to design the diaphragm type vibration damping pipe of the piston type self-balancing structure, comprises the following steps:

[0019] S1. Determine the inner diameter of the piston flange, the inner diameter and outer diameter of the piston, the inner diameter and outer diameter of the inner compression plate, the minor diameter and major diameter of the membrane bladder, and the inner diameter of the bladder flange;

[0020] Among them, the inner diameter of the piston flange is the same as the inner diameter of the inner pressure plate and the inner diameter of the bladder flange, and is represented by 2R1; and the inner diameter size of the piston flange and the inner diameter size of the bladder flange are the diameter size of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed; the value of R1 is determined by the diameter specification of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed, that is, the radius value of its diameter; the inner diameter of the inner pressure plate is determined by its structure, and in order to reduce the overall radial size, it is generally taken to be equal to the diameter value of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed;

[0021] S2. Determine the inner wall thickness of the piston flange according to the structural strength requirements of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed, and thereby determine the minor diameter of the annular groove of the piston flange and the inner diameter of the piston, which are expressed as 2R2; at the same time, determine the major diameter of the annular groove of the piston flange according to the outer diameter of the piston, which is expressed as 2R3; wherein the minimum size of R3 is determined by the size required by the annular groove of the piston flange to accommodate the second connection mounting screw hole structure of its end face;

[0022] S3, determine the minimum outer diameter of the inner compression plate according to the structural requirements, and then determine the minor diameter of the membrane bladder according to the structure and molding process requirements of the membrane bladder, and express it as 2R4; determine the structural dimensions of the membrane bladder according to the working pressure requirements and stiffness requirements of the membrane vibration reduction pipe of the piston-type self-balancing structure to be designed, and then determine the major diameter of the membrane bladder, and then determine the inner diameter of the end of the tube body close to the outer compression plate, and express it as 2R5;

[0023] S4, based on steps S1 to S3, the structural relationship dimensions among the piston flange, the piston, the tube body, the inner clamping plate, the membrane bladder and the bladder flange are obtained;

[0024] S5. According to the actual strength requirements and structural needs, based on the structural relationship dimensions determined in step S4, the specific dimensions of the piston flange, piston, tube body, inner clamping plate, membrane bladder and bladder flange are adjusted to obtain the desired designed piston self-balancing structure membrane vibration reduction pipe;

[0025] Among them, when the diaphragm vibration reduction pipe of the piston self-balancing structure is working, after ignoring the friction force generated by the piston, the axial force of the piston flange, piston, inner clamping plate and diaphragm capsule is as follows:

[0026] The piston flange is subjected to three forces in the axial direction, namely, the fluid pressures F1 and F2, and the tension F3 of the membrane bladder (2). The corresponding force balance equation is as follows:

[0027] F1=F2+F3(a)

[0028] In formula (a), P is the rated working pressure of the diaphragm vibration reduction pipe of the piston self-balancing structure;

[0029] From formula (a), we can get:

[0030]

[0031] The piston is subjected to two forces in the axial direction, namely the fluid pressure F4 and the tension F5 of the elastic connecting ring. The corresponding force balance equation is as follows:

[0032] F4=F5(b)

[0033] In formula (b),

[0034] The inner pressure plate is subjected to three forces in the axial direction, namely the tension F6 of the membrane bladder, the tension F5 of the elastic connecting ring and the fluid pressure F8. The corresponding force balance equation is as follows:

[0035] F5=F6+F8(c)

[0036] In formula (c),

[0037] From equation (b) and equation (c), we can get:

[0038]

[0039] The membrane bladder is subjected to three forces in the axial direction, namely, the fluid pressure F7, the tension F3 of the tube body and the tension F6 of the inner pressure plate. The corresponding force balance equation is as follows:

[0040] F7=F3+F6(d)

[0041] In formula (d),

[0042] Substituting the above values ​​of F3 and F6 into the right side of formula (d), we can obtain:

[0043]

[0044] It can be seen from the above formula that formula (d) is an identity, which means that the membrane-type vibration-damping pipe of the piston-type self-balancing structure to be designed meets the force balance requirements.

[0045] Compared with the prior art, the advantages of the present invention are as follows:

[0046] The piston-type self-balancing structure membrane-type vibration-damping pipe provided by the present invention adopts a membrane-type flexible bladder and a balancing piston, which are connected by a penetrating elastic element, wherein the membrane-type flexible bladder is composed of an aramid cord skeleton layer and inner and outer rubber layers, and withstands the fluid pressure in the pipe and deforms to adapt to the axial and radial displacements on both sides of the pipe, thereby realizing the working pressure requirements and displacement compensation capacity requirements of the pipe; the balancing piston withstands the fluid pressure in the pipe, and generates a pulling force on the bladder base through the elastic element connected to the membrane-type flexible bladder, balancing its axial force, achieving self-balancing of the force of the pipe under the action of the internal fluid pressure, and realizing the balance requirement of the pipe.

[0047] The innovative points of the present invention are mainly as follows:

[0048] 1. A membrane-type vibration-damping pipe with a piston-type self-balancing structure is proposed. The vibration-damping bag of the membrane structure bears the fluid pressure in the pipe, produces axial and radial deformation, so as to realize the axial and radial displacement compensation of the pipe; the piston structure is used to generate an axial balancing force on the vibration-damping bag under the action of fluid pressure, so as to realize the axial force balance of the pipe.

[0049] 2. The pipe adopts a single membrane-type vibration-damping bag, which is beneficial to reduce the stiffness of the pipe and the overall size of the pipe.

[0050] 3. The pipe connection uses a rubber capsule and a rigid piston combination to achieve axial force balance of the pipe connection.

[0051] 4. The connection between the piston and the bladder body is made of a rubber material with a skeleton to form a cylindrical structure with a penetration hole or a plurality of circumferentially distributed strip structures, which can provide resistance to the pulling force generated by the fluid pressure on the piston surface on the one hand, and meet the axial movement of the piston on the other hand.

[0052] 5. The structural dimension relationship and design method of the connecting pipe are given, and the axial force balance of the connecting pipe is achieved by the structural dimension relationship. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solution in this embodiment, the following is a brief introduction to the drawings required for use in the description of the embodiment. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0054] Figure 1 It is a schematic diagram of the overall cross section of the membrane type vibration reduction pipe of the piston type self-balancing structure of the present invention;

[0055] Figure 2 is a schematic cross-sectional view of a membrane bladder;

[0056] Figure 3It is a schematic diagram of the upper half of the cross section of the membrane type vibration reduction pipe of the piston type self-balancing structure of the present invention;

[0057] Figure 4 It is a schematic diagram of the axial force of each component in the upper half of the membrane type vibration reduction pipe of the piston type self-balancing structure of the present invention;

[0058] Explanation of the accompanying drawings: 1. bladder flange; 101. first sealing structure; 102. first connecting mounting screw hole; 2. membrane bladder; 201. inner rubber layer; 202. aramid skeleton layer; 203. outer rubber layer; 204. outer fastening ring; 205. inner fastening ring; 3. inner pressure plate; 4. outer pressure plate; 5. tube body; 6. elastic connecting ring; 601. inner connecting seat; 602. outer connecting seat; 603. cylinder body; 7. piston; 8. piston flange; 801. second sealing structure; 802. second connecting mounting screw hole; 9. first sealing ring; 10. second sealing ring; 11. third sealing ring. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0060] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0062] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The present invention will be further described below in conjunction with the accompanying drawings:

[0064] like Figure 1 and Figure 2 As shown, the present invention provides a diaphragm vibration damping connecting pipe of a piston-type self-balancing structure, comprising a bladder flange 1, a diaphragm bladder 2, an inner pressure plate 3, an outer pressure plate 4, a tube body 5, an elastic connecting ring 6, a piston 7 and a piston flange 8. One end of the bladder flange 1 is used to be connected to an external pipeline, and the other end is connected to the diaphragm bladder 2. The diaphragm bladder 2 is an annular semicircular arc structure, whose inner ring is connected to the inner pressure plate 3 and the bladder flange 1, and the outer ring is connected to the outer pressure plate 4 and the tube body 5. The inner pressure plate 3 is connected to the elastic connecting ring 6, and the elastic connecting ring 6 is connected to the piston 7. The piston 7 is slidably arranged inside the piston flange 8, and one end of the piston flange 8 is connected to the tube body 5, and the other end is used to be connected to another external pipeline.

[0065] Specifically, as an embodiment of the present invention: one end of the bladder flange 1 connected to the external pipe is provided with a first sealing structure 101 and a first connecting mounting screw hole 102, and the end of the bladder flange 1 connected to the membrane bladder 2 is connected and fastened with the inner ring of the membrane bladder 2 between the bladder flange 1 and the inner pressure plate 3 by screws.

[0066] Specifically, as an embodiment of the present invention: the outer ring of the membrane bladder 2 is fastened between the outer pressure plate 4 and the tube body 5 by screw connection, wherein the membrane bladder 2 is composed of an inner rubber layer 201, an aramid skeleton layer 202, an outer rubber layer 203, an outer fastening ring 204 and an inner fastening ring 205, and is vulcanized into a whole through a vulcanization process.

[0067] More specifically, if Figure 2As shown, in the above embodiment, the cross-sectional shape of the membrane bladder 2 is divided into five parts: A, B, C, D, and E; wherein, part A is an outer plane circular ring, and the aramid skeleton layer 202 of this part is turned back by the outer fastening ring 204 to achieve the effect of preventing the membrane bladder 2 from being pulled out, and the inner rubber layer 201 and the outer rubber layer 203 play a sealing role after the membrane bladder 2 is installed and fastened; part B is an inner plane circular ring, and the aramid skeleton layer 202 of this part is turned back by the inner fastening ring 205 to achieve the effect of preventing the membrane bladder 2 from being pulled out, and the inner rubber layer 201 and the outer rubber layer 2 02 It plays a sealing role after the membrane bladder 2 is installed and tightened; Part C and Part D are both cylindrical surfaces, and their outer rubber layers 203 are respectively tightly attached to the cylindrical surfaces of the bladder flange 1 and the outer clamping plate 4. When the connecting pipe undergoes axial or radial displacement deformation, Part C and Part D can become longer or shorter to adapt to the above-mentioned deformation of the connecting pipe; Part E is an arc segment. When the connecting pipe undergoes axial or radial displacement deformation, its arc radius can be correspondingly increased or decreased to adapt to the above-mentioned deformation of the connecting pipe and reduce the axial stiffness and radial stiffness of the connecting pipe.

[0068] Specifically, as an embodiment of the present invention: the inner pressure plate 3 is circumferentially distributed with a plurality of first optical holes and a plurality of first threaded holes; wherein the first optical holes are used for penetrating screws for connecting the inner pressure plate 3 with the membrane bladder 2 and the bladder flange 1, and the first threaded holes are used for penetrating screws for connecting the inner pressure plate 3 with the elastic connecting ring 6.

[0069] Specifically, as an embodiment of the present invention: a plurality of second light holes are distributed circumferentially on the outer compression plate 4 , and the second light holes are used to penetrate screws for connecting the outer compression plate 4 with the membrane bladder 2 and the tube body 5 .

[0070] Specifically, as an embodiment of the present invention: the tube body 5 and the piston flange 8 are connected by screws, and at least one first sealing ring 9 is provided between the tube body 5 and the piston flange 8 for sealing the joint between the tube body 5 and the piston flange 8; more specifically, the first sealing ring 9 is an O-ring.

[0071] Specifically, as an embodiment of the present invention: the elastic connecting ring 6 includes an inner connecting seat 601, an outer connecting seat 602 and a cylinder 603, the inner connecting seat 601 is arranged at one end of the cylinder 603, the outer connecting seat 602 is arranged at the other end of the cylinder 603, and the inner connecting seat 601, the outer connecting seat 602 and the cylinder 603 are vulcanized into a whole through a vulcanization process. When the connecting pipe undergoes axial and radial displacement deformation, the elastic connecting ring 6 produces corresponding deformation, which can ensure that the piston 7 can move axially and tighten the capsule flange 1, thereby achieving the balance of the axial force of the connecting pipe and meeting the balance requirement of the connecting pipe.

[0072] Specifically, as an embodiment of the present invention: a plurality of third light holes are distributed circumferentially of the inner connecting seat 601 , and the third light holes are used to penetrate screws for connecting the inner connecting seat 601 and the inner clamping plate 3 .

[0073] Specifically, as an embodiment of the present invention: a plurality of fourth light holes are distributed in the circumferential direction of the external connection seat 602 , and the fourth light holes are used to penetrate screws for connecting the external connection seat 602 and the piston 7 .

[0074] Specifically, as an embodiment of the present invention: the cylinder 603 is a rubber structure with an aramid skeleton layer, and a plurality of through holes are opened in the circumference thereof for allowing the fluid in the pipe to pass through.

[0075] Specifically, as an embodiment of the present invention: at least one second sealing ring 10 is provided between the inner ring of the piston 7 and the piston flange 8, and at least one third sealing ring 11 is provided between the outer ring of the piston 7 and the piston flange 8. The second sealing ring 10 and the third sealing ring 11 are used to seal the piston 7, so that the piston 7 only bears the fluid pressure on one side in the axial direction, thereby achieving axial force balance with the fluid pressure borne by the membrane bladder 2. More specifically, the second sealing ring 10 and the third sealing ring 11 are both O-rings.

[0076] Specifically, as an embodiment of the present invention: a second sealing structure 801 and a second connecting mounting screw hole 802 are provided at one end of the piston flange 8 connected to the external pipeline, and an annular groove 803 is provided at one end of the piston flange 8 connected to the tube body 5, and the annular groove 803 is used to accommodate the piston 7 and provide axial movement space for the piston 7.

[0077] like Figure 3 and Figure 4 The present invention also provides a method for designing a membrane type vibration damping pipe of a piston type self-balancing structure, which is used to design a membrane type vibration damping pipe of a piston type self-balancing structure, and comprises the following steps:

[0078] S1, determine the inner diameter of the piston flange 8, the inner diameter and outer diameter of the piston 7, the inner diameter and outer diameter of the inner compression plate 3, the minor diameter and major diameter of the membrane bladder 2, and the inner diameter of the bladder flange 1;

[0079] Among them, the inner diameter of the piston flange 8 is the same as the inner diameter of the inner pressure plate 3 and the inner diameter of the capsule flange 1, and is represented by 2R1; and the inner diameter size of the piston flange 8 and the inner diameter size of the capsule flange 1 are the diameter size of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed; the value of R1 is determined by the diameter specification of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed, that is, the radius value of its diameter; the inner diameter of the inner pressure plate 3 is determined by its structure, and in order to reduce the overall radial size, it is generally taken to be equal to the diameter of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed;

[0080] S2. Determine the inner wall thickness of the piston flange 8 according to the structural strength requirements of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed, and thereby determine the minor diameter of the annular groove 803 of the piston flange 8 and the inner diameter of the piston 7, which are expressed as 2R2; at the same time, determine the major diameter of the annular groove 803 of the piston flange 8 according to the outer diameter of the piston 7, which is expressed as 2R3; wherein the minimum size of R3 is determined by the size required by the annular groove 803 of the piston flange 8 to accommodate the second connecting mounting screw hole 802 of its end surface;

[0081] S3, determine the minimum outer diameter of the inner compression plate 3 according to the structural requirements, and then determine the minor diameter of the membrane bladder 2 according to the structural and molding process requirements of the membrane bladder 2, and express it as 2R4; determine the structural dimensions of the membrane bladder 2 according to the working pressure requirements and stiffness requirements of the membrane vibration reduction pipe of the piston self-balancing structure to be designed, and then determine the major diameter of the membrane bladder 2, and then determine the inner diameter of the tube body 5 close to the end of the outer compression plate 4, and express it as 2R5;

[0082] S4, based on steps S1 to S3, the structural relationship dimensions among the piston flange 8, the piston 7, the tube body 5, the inner compression plate 3, the membrane bladder 2 and the bladder flange 1 are obtained;

[0083] S5. According to the actual strength requirements and structural needs, based on the structural relationship dimensions determined in step S4, the specific dimensions of the piston flange 8, the piston 7, the tube body 5, the inner clamping plate 3, the membrane bladder 2 and the bladder flange 1 are adjusted to obtain the desired designed piston self-balancing structure membrane vibration reduction pipe;

[0084] Among them, when the diaphragm vibration reduction pipe of the piston self-balancing structure is working, after ignoring the friction force generated by the piston 7, the axial force of the piston flange 8, the piston 7, the inner clamping plate 3 and the diaphragm bladder 2 is as follows:

[0085] The piston flange 8 is subjected to three forces in the axial direction, namely, the fluid pressures F1 and F2, and the tension F3 of the membrane bladder 2. The corresponding force balance equation is as follows:

[0086] F1=F2+F3(a)

[0087] In formula (a), P is the rated working pressure of the diaphragm vibration reduction pipe of the piston self-balancing structure;

[0088] From formula (a), we can get:

[0089]

[0090] The piston 7 is subjected to two forces in the axial direction, namely the fluid pressure F4 and the tension F5 of the elastic connecting ring 6, and the corresponding force balance equation is as follows:

[0091] F4=F5(b)

[0092] In formula (b),

[0093] The inner pressure plate 3 is subjected to three forces in the axial direction, namely, the tension F6 of the membrane bladder 2, the tension F5 of the elastic connecting ring 6 and the fluid pressure F8. The corresponding force balance equation is as follows:

[0094] F5=F6+F8(c)

[0095] In formula (c),

[0096] From equation (b) and equation (c), we can get:

[0097]

[0098] The membrane bladder 2 is subjected to three forces in the axial direction, namely, the fluid pressure F7, the tension F3 of the tube 5 and the tension F6 of the inner pressure plate 3, and the corresponding force balance equation is as follows:

[0099] F7=F3+F6(d)

[0100] In formula (d),

[0101] Substituting the above values ​​of F3 and F6 into the right side of formula (d), we can obtain:

[0102]

[0103] It can be seen from the above formula that formula (d) is an identity, which means that the membrane-type vibration-damping pipe of the piston-type self-balancing structure to be designed meets the force balance requirements.

[0104] It should be noted that: considering that the piston flange 8 and the tube body 5 are rigidly connected, the present invention considers them as one component when designing the diaphragm type vibration damping pipe of the piston type self-balancing structure. In addition, since the diaphragm type vibration damping pipe is an axial rotation structure, the fluid pressure it is subjected to is balanced in the radial direction. Therefore, when designing the diaphragm type vibration damping pipe of the piston type self-balancing structure, the present invention only analyzes the axial force of the diaphragm type vibration damping pipe when subjected to the fluid pressure.

[0105] Specifically, the axial force on each component in the membrane type vibration reduction connecting pipe of the membrane piston type self-balancing structure provided by the present invention includes the axial force generated by the fluid pressure and the interaction force between the components.

[0106] Specifically, when the piston-type self-balancing structure provided by the present invention is in operation, the stress conditions of the membrane-type vibration-damping pipe are as follows: Figure 4 As shown. Figure 1 As shown, the diaphragm type vibration reduction pipe of the piston type self-balancing structure provided by the present invention has an independent radius size in the structure. Figure 4 R1, R2, R3, R4, and R5 are marked therein. Therefore, determining these radius sizes is the key to designing the membrane type vibration reduction connecting pipe of the piston type self-balancing structure provided by the present invention.

[0107] In addition, by combining the above force balance equations (a) to (d), an identity can be obtained. According to this identity, it can be explained that according to the structural dimension relationship obtained by the design method provided by the present invention, the diaphragm type vibration damping pipe of the piston type self-balancing structure provided by the present invention can meet the requirements of axial force balance under any diameter and fluid pressure. Therefore, when designing the diaphragm type vibration damping pipe of the piston type self-balancing structure of the present invention, it is only necessary to meet Figure 4 The structural size relationship in the pipe can achieve the balance requirement of the axial force of the pipe.

[0108] Finally, it should be noted that the above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A membrane type vibration reduction pipe with a piston type self-balancing structure, characterized in that: The invention comprises a bladder flange (1), a membrane bladder (2), an inner pressure plate (3), an outer pressure plate (4), a tube body (5), an elastic connecting ring (6), a piston (7) and a piston flange (8); one end of the bladder flange (1) is used to be connected to an external pipeline, and the other end is connected to the bladder (2); the bladder (2) is an annular semicircular arc structure, the inner ring of which is connected to the inner pressure plate (3) and the bladder flange (1), and the outer ring is connected to the outer pressure plate (4) and the tube body (5); the inner pressure plate (3) is connected to the elastic connecting ring (6), and the elastic connecting ring (6) is connected to the piston (7); the piston (7) is slidably arranged inside the piston flange (8); one end of the piston flange (8) is connected to the tube body (5), and the other end is used to be connected to another external pipeline.

2. The membrane type vibration damping pipe of the piston type self-balancing structure according to claim 1 is characterized in that: The end of the bladder flange (1) connected to the external pipe is provided with a first sealing structure (101) and a first connecting mounting screw hole (102), and the end of the bladder flange (1) connected to the membrane bladder (2) is connected and fastened with the inner ring of the membrane bladder (2) between the bladder flange (1) and the inner clamping plate (3) by screws.

3. The membrane type vibration damping pipe of the piston type self-balancing structure according to claim 2 is characterized in that: The outer ring of the membrane bladder (2) is fastened between the outer pressure plate (4) and the tube body (5) by screw connection, wherein the membrane bladder (2) is composed of an inner rubber layer (201), an aramid skeleton layer (202), an outer rubber layer (203), an outer fastening ring (204) and an inner fastening ring (205), and is vulcanized into a whole by a vulcanization process.

4. The membrane type vibration damping pipe of the piston type self-balancing structure according to claim 2 is characterized in that: The inner pressure plate (3) is circumferentially distributed with a plurality of first light holes and a plurality of first threaded holes. The first light holes are used to penetrate screws used to connect the inner pressure plate (3) with the membrane bladder (2) and the bladder flange (1), and the first threaded holes are used to penetrate screws used to connect the inner pressure plate (3) with the elastic connecting ring (6).

5. The membrane type vibration damping pipe of the piston type self-balancing structure according to claim 3 is characterized in that: The outer compression disc (4) is provided with a plurality of second light holes distributed in the circumferential direction, and the second light holes are used to penetrate screws for connecting the outer compression disc (4) with the membrane-type bladder (2) and the tube body (5).

6. The membrane type vibration damping pipe of the piston type self-balancing structure according to claim 1 is characterized in that: The tube body (5) and the piston flange (10) are connected via screws, and at least one first sealing ring (9) is also provided between the tube body (5) and the piston flange (10).

7. The membrane type vibration damping pipe of the piston type self-balancing structure according to claim 1 is characterized in that: The elastic connecting ring (6) comprises an inner connecting seat (601), an outer connecting seat (602) and a cylinder (603), wherein the inner connecting seat (601) is arranged at one end of the cylinder (603), and the outer connecting seat (602) is arranged at the other end of the cylinder (603), and the inner connecting seat (601), the outer connecting seat (602) and the cylinder (603) are vulcanized into a whole through a vulcanization process; The inner connecting seat (601) is provided with a plurality of third light holes distributed in the circumferential direction, and the third light holes are used to penetrate screws for connecting the inner connecting seat (601) and the inner clamping plate (3); The outer connection seat (602) is provided with a plurality of fourth light holes distributed in the circumferential direction, and the fourth light holes are used to penetrate screws for connecting the outer connection seat (602) and the piston (7); The cylinder (603) is a rubber structure with an aramid skeleton layer, and is provided with a plurality of through holes in its circumference for allowing the fluid in the pipe to pass through.

8. The membrane type vibration damping pipe of the piston type self-balancing structure according to claim 1 is characterized in that: At least one second sealing ring (10) is arranged between the inner ring of the piston (7) and the piston flange (8), and at least one third sealing ring (11) is arranged between the outer ring of the piston (7) and the piston flange (8).

9. The membrane type vibration damping pipe of the piston type self-balancing structure according to claim 1 is characterized in that: The end of the piston flange (8) connected to the external pipeline is provided with a second sealing structure (801) and a second connecting mounting screw hole (802), and the end of the piston flange (8) connected to the pipe body (5) is provided with an annular groove (803), and the annular groove (803) is used to accommodate the piston (7).

10. A design method for a membrane type vibration reduction pipe of a piston type self-balancing structure, characterized in that: The membrane type vibration damping pipe for designing the piston type self-balancing structure according to any one of claims 1 to 9 comprises the following steps: S1. Determine the inner diameter of the piston flange (8), the inner diameter and outer diameter of the piston (7), the inner diameter and outer diameter of the inner pressure plate (3), the minor diameter and major diameter of the membrane bladder (2), and the inner diameter of the bladder flange (1); The inner diameter of the piston flange (8) is the same as the inner diameter of the inner pressure plate (3) and the inner diameter of the capsule flange (1), and is represented by 2R1; and the inner diameter size of the piston flange (8) and the inner diameter size of the capsule flange (1) are the diameter size of the membrane type vibration damping pipe of the piston type self-balancing structure to be designed; the value of R1 is determined by the diameter specification of the membrane type vibration damping pipe of the piston type self-balancing structure to be designed, that is, the radius value of its diameter; the inner diameter of the inner pressure plate (3) is determined by its structure, and in order to reduce the overall radial size, it is generally taken to be equal to the diameter value of the membrane type vibration damping pipe of the piston type self-balancing structure to be designed; S2. Determine the inner wall thickness of the piston flange (8) according to the structural strength requirements of the diaphragm type vibration damping pipe of the piston type self-balancing structure to be designed, and thereby determine the minor diameter of the annular groove (803) of the piston flange (8) and the inner diameter of the piston (7), which are expressed as 2R2; at the same time, determine the major diameter of the annular groove (803) of the piston flange (8) according to the outer diameter of the piston (7), which is expressed as 2R3; wherein the minimum size of R3 is determined by the size required by the annular groove (803) of the piston flange (8) to accommodate the structural requirements of the second connecting mounting screw hole (802) on its end surface; S3, determine the minimum outer diameter of the inner pressure plate (3) according to its structural requirements, and then determine the minor diameter of the membrane bladder (2) according to the structure and molding process requirements of the membrane bladder (2), and represent it as 2R4; determine the structural dimensions of the membrane bladder (2) according to the working pressure requirements and stiffness requirements of the membrane vibration reduction pipe of the piston-type self-balancing structure to be designed, and then determine the major diameter of the membrane bladder (2), and then determine the inner diameter of the tube body (5) close to the end of the outer pressure plate (4), and represent it as 2R5; S4, based on steps S1 to S3, the structural relationship dimensions between the piston flange (8), the piston (7), the tube body (5), the inner compression plate (3), the membrane bladder (2) and the bladder flange (1) are obtained; S5. According to the actual strength requirements and structural needs, based on the structural relationship dimensions determined in step S4, the specific dimensions of the piston flange (8), the piston (7), the tube body (5), the inner pressure plate (3), the membrane bladder (2) and the bladder flange (1) are adjusted to obtain the desired designed piston self-balancing structure of the membrane vibration reduction pipe; When the diaphragm type vibration reduction pipe of the piston type self-balancing structure is working, after ignoring the friction force generated by the piston (7), the axial force of the piston flange (8), the piston (7), the inner clamping plate (3) and the diaphragm type capsule (2) is as follows: The piston flange (8) is subjected to three forces in the axial direction, namely, the fluid pressures F1 and F2, and the tension F3 of the membrane bladder (2). The corresponding force balance equation is as follows: F1=F2+F3 (a) In formula (a), P is the rated working pressure of the diaphragm vibration reduction pipe of the piston self-balancing structure; From formula (a), we can get: The piston (7) is subjected to two forces in the axial direction, namely the fluid pressure F4 and the tension F5 of the elastic connecting ring (6), and the corresponding force balance equation is as follows: F4=F5 (b) In formula (b), The inner pressure plate (3) is subjected to three forces in the axial direction, namely, the tension F6 of the membrane bladder (2), the tension F5 of the elastic connecting ring (6) and the fluid pressure F8. The corresponding force balance equation is as follows: F5=F6+F8 (c) In formula (c), From equation (b) and equation (c), we can get: The membrane bladder (2) is subjected to three forces in the axial direction, namely, the fluid pressure F7, the tension F3 of the tube (5) and the tension F6 of the inner pressure plate (3), and the corresponding force balance equation is as follows: F7=F3+F6 (d) In formula (d), Substituting the above values ​​of F3 and F6 into the right side of formula (d), we can obtain: It can be seen from the above formula that formula (d) is an identity, which means that the membrane-type vibration-damping pipe of the piston-type self-balancing structure to be designed meets the force balance requirements.

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