Novel straight pipe pressure balance expansion joint
By optimizing the arrangement of the balanced bellows and the design of the tie rod assembly, the problem that existing expansion joints cannot simultaneously compensate for large axial and lateral displacements has been solved, achieving a compact and reliable displacement compensation effect.
Patent Information
- Application Number
- CN202423242828.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing expansion joints cannot simultaneously meet the requirements for large axial and lateral displacement compensation, and they are also large in size and occupy a large space.
By optimizing the arrangement of the balancing bellows, the first balancing bellows assembly is in an internal pressure state and the second balancing bellows assembly is in an external pressure state. An inner sleeve design is adopted, and the axial guiding function is achieved by combining the tie rod assembly passing through the gap of the ring plate. The axial displacement is compensated by the gap between the outlet pipe and the third connecting pipe. The floating space of the third ring plate drives the balancing bellows to generate lateral displacement.
It achieves compensation for large axial and lateral displacements, while reducing the installation length and spatial structure of the expansion joint, making it more compact and reliable.
Smart Images
Figure CN223469917U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to metal bellows expansion joint application technical field, specifically, a kind of novel straight pipe pressure balance expansion joint. BACKGROUND
[0002] The basic form of displacement absorption of metal bellows expansion joint includes axial displacement, lateral displacement and angular displacement, according to the different arrangement scheme of pipeline, different structural type of metal bellows expansion joint is selected to compensate the displacement of pipeline caused by temperature change, so as to reduce the stress of pipeline.
[0003] The traditional inner pressure straight pipe pressure balance expansion joint structure is as shown in Figure 1 Two working bellows located at both ends and one balance bellows located in the middle, pull rod and end plate and other structural members are composed, pull rod is arranged outside working bellows and balance bellows, the distance between one working bellows and balance bellows of the expansion joint is kept unchanged in the whole working process by the constraint of pull rod, ball, conical washer and nut at the end of pull rod allow pull rod to tilt while constraining pressure thrust, so that bellows absorbs lateral displacement. Pull rod is arranged cross outside working bellows and balance bellows, only can compensate smaller lateral displacement, mainly used for absorbing axial displacement. That is, the expansion joint of prior art not only cannot meet the large axial and lateral displacement simultaneously, but also has the problems of larger external size and larger space position. SUMMARY
[0004] Therefore, the utility model aims at providing a novel straight pipe pressure balance expansion joint, to solve the problems of the expansion joint of prior art, which not only cannot meet the large axial and lateral displacement simultaneously, but also has the problems of larger external size and larger space position.
[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:
[0006] A novel straight pipe pressure balance expansion joint, comprising a working wave assembly, a first balance wave assembly, a second balance wave assembly and a pull rod assembly, the working wave assembly is connected with an outlet pipe, a second ring plate is connected at the connection, the pull rod assembly passes through the second ring plate, the first balance wave assembly is sleeved outside the second balance wave assembly, one end of the first balance wave assembly is connected with the second ring plate, the other end of the first balance wave assembly is connected with a third connecting pipe through the pull rod assembly, one end of the second balance wave assembly is connected with the outlet pipe through a fourth ring plate, the other end of the second balance wave assembly is connected with the third connecting pipe, the outlet pipe and the third connecting pipe have a gap, a through hole is arranged on the outlet pipe, the through hole allows working medium to enter the cavity formed by the first balance wave assembly and the second balance wave assembly.
[0007] The pull rod assembly passes through the second ring plate in the setting, and has a gap therebetween, so that axial guiding function is achieved, and axial displacement compensation stability of the expansion joint is improved; by optimizing arrangement mode of the balance bellows, the first balance bellows assembly is in an internal pressure state, the second balance bellows assembly is in an external pressure state, the two groups of balance bellows are designed in a nested mode, pressure thrust balance of the working bellows and the balance bellows is achieved, and meanwhile, installation length of the expansion joint is effectively reduced, so that the space structure of the entire expansion joint is more compact, and reliability is high, and cooperation with the working bellows assembly and the pull rod assembly enables the expansion joint to compensate for large axial displacement and large lateral displacement.
[0008] Further, one end of the working bellows assembly is connected with the inlet pipe, the other end of the working bellows assembly is connected with the outlet pipe, one end of the pull rod assembly is connected on the inlet pipe, and the other end of the pull rod assembly is connected on the third connecting pipe.
[0009] Further, the pull rod assembly comprises a first ring plate, a short pull rod, a pull rod connecting cylinder, a long pull rod and a third ring plate connected in sequence, the first ring plate is connected on the inlet pipe, the third ring plate is connected on the third connecting pipe, the second ring plate is located between the first ring plate and the third ring plate, and the long pull rod passes through the second ring plate. Ball taper surface washers are arranged at the connecting positions of the short pull rod and the pull rod connecting cylinder, and the connecting positions of the pull rod connecting cylinder and the long pull rod.
[0010] In the setting, the ball taper surface washers arranged on both sides of the pull rod connecting cylinder can realize lateral displacement compensation function in cooperation with deformation of the two groups of working bellows.
[0011] Further, the pull rod assembly further comprises a rib plate connected with the third ring plate and / or the first ring plate.
[0012] Further, the first balance bellows assembly comprises a first connecting pipe, a first balance bellows and a second connecting pipe connected in sequence, the first connecting pipe is connected with the outlet pipe through the second ring plate, the second connecting pipe is connected on the third ring plate, and the through hole is located between the second ring plate and the second balance bellows assembly.
[0013] Further, the second balance bellows assembly comprises a fourth connecting pipe and a second balance bellows connected in sequence, the fourth connecting pipe is connected with the outlet pipe through a fourth ring plate, the second balance bellows is connected with the third connecting pipe, and the through hole is located between the second ring plate and the fourth ring plate.
[0014] Further, the working bellows assembly comprises a first working bellows and a second working bellows, the inlet pipe is connected with the first working bellows, the first working bellows is connected with the second working bellows through a connecting pipe, and the second working bellows is connected with the outlet pipe.
[0015] Further, the gap between the outlet pipe and the third connecting pipe is L, L=30-50mm.
[0016] The setting makes the working bellows compress and the balance bellows stretch when the third connecting pipe is axially elongated, thereby realizing the function of compensating for the larger axial displacement of the pipeline.
[0017] Further, the through hole is provided with 6-10.
[0018] The setting realizes the state that the first balance bellows is subjected to internal pressure and the second balance bellows is subjected to external pressure.
[0019] Further, a flow guide cylinder is arranged inside the working wave assembly.
[0020] Compared with the prior art, the novel straight pipe pressure balance expansion joint has the following advantages:
[0021] 1) The pull rod assembly in the utility model passes through the second ring plate, and a gap is formed between the two, which can realize the axial guiding function and improve the axial displacement compensation stability of the expansion joint; by optimizing the arrangement mode of the balance bellows, the first balance wave assembly is in the internal pressure state, the second balance wave assembly is in the external pressure state, the two groups of balance bellows are designed in the form of internal sleeve, the pressure thrust balance of the working bellows and the balance bellows is realized, the installation length of the expansion joint can be effectively reduced, so that the space structure of the entire expansion joint is more compact and has high reliability, and the working wave assembly and the pull rod assembly are cooperated, so that the expansion joint can compensate for the larger axial displacement and the larger transverse displacement at the same time;
[0022] 2) The gap between the outlet pipe and the third connecting pipe is set, the first balance bellows and the second balance bellows are driven by the pull rod assembly and the second ring plate to produce tensile displacement when the working bellows produces compressive displacement due to the thermal elongation of the pipeline, thereby realizing the function of compensating for the larger axial displacement of the expansion joint, and the third ring plate has the space of floating up and down, drives the first balance bellows and the second balance bellows to produce transverse displacement, thereby realizing the function of compensating for the larger transverse displacement of the expansion joint;
[0023] 3) The spherical conical surface gasket is arranged at the connection between the short pull rod and the pull rod connecting cylinder and the connection between the pull rod connecting cylinder and the long pull rod, so as to compensate for the transverse displacement in cooperation with the deformation of the two groups of working bellows. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 It is a structural schematic view of a traditional internal pressure straight pipe pressure balance expansion joint.
[0025] Figure 2 The utility model relates to a whole structure schematic diagram of a novel straight pipe pressure balance expansion joint.
[0026] Mark explanation:
[0027] 1 - inlet pipe, 2 - first ring plate, 3 - short pull rod, 4 - spherical conical washer, 5 - first working bellows, 6 - flow guide cylinder, 7 - pull rod connecting cylinder, 8 - connecting pipe, 9 - second working bellows, 10 - second ring plate, 11 - first connecting pipe, 12 - first balance bellows, 13 - second balance bellows, 14 - long pull rod, 15 - second connecting pipe, 16 - rib plate, 17 - third ring plate, 18 - third connecting pipe, 19 - outlet pipe, 191 - through hole, 20 - fourth connecting pipe, 21 - fourth ring plate. Specific embodiment
[0028] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiment of the utility model is explained in detail below in combination with the drawings. In addition, the direction or position relationship mentioned in the embodiment is briefly described: the direction or position relationship indicated in the embodiment is the direction or position relationship shown in the drawing; the "axial direction" mentioned in the embodiment is the left and right movement direction, the "transverse direction" is the up and down movement direction, the "inner" means close to the expansion joint axis, and the "outer" means away from the expansion joint axis.
[0029] As Figure 2 shown, the utility model relates to a novel straight pipe pressure balance expansion joint, including working wave subassembly, first balance wave subassembly, second balance wave subassembly, pull rod subassembly, the working wave subassembly is connected with outlet pipe 19, and the second ring plate 10 is connected on the connecting place, the pull rod subassembly passes through the second ring plate 10, and both have gap, the first balance wave subassembly is set outside the second balance wave subassembly, one end of the first balance wave subassembly is connected with the second ring plate 10, the other end of the first balance wave subassembly is connected on the third connecting pipe 18 through the pull rod subassembly, one end of the second balance wave subassembly is connected on the outlet pipe 19 through the fourth ring plate 21, the other end of the second balance wave subassembly is connected with the third connecting pipe 18, the outlet pipe 19 and the third connecting pipe 18 have gap, the outlet pipe 19 is provided with through hole 191, and the through hole 191 makes working medium enter the cavity formed by the first balance wave subassembly and the second balance wave subassembly.
[0030] In the setting, the pull rod assembly passes through the second ring plate with a gap therebetween, so as to realize the axial guiding function and improve the axial displacement compensation stability of the expansion joint; by optimizing the arrangement mode of the balance bellows, the first balance bellows assembly is in the internal pressure state, the second balance bellows assembly is in the external pressure state, the two groups of balance bellows are designed in the inner sleeve type, the pressure thrust balance of the working bellows and the balance bellows is realized, and meanwhile the installation length of the expansion joint can be effectively reduced, so that the space structure of the whole expansion joint is more compact and has high reliability, and cooperated with the working bellows assembly and the pull rod assembly, the expansion joint can compensate the larger axial displacement and the larger lateral displacement.
[0031] Specifically, the gap between the outlet pipe 19 and the third connecting pipe 18 is L, L = 30-50 mm. The gap can be used to realize the axial displacement compensation function of the expansion joint when the working bellows generates the compression displacement due to the thermal elongation of the pipeline, the first balance bellows and the second balance bellows generate the tensile displacement through the pull rod assembly and the second ring plate, and the third ring plate has the up-down floating space to drive the first balance bellows and the second balance bellows to generate the lateral displacement, so as to realize the lateral displacement compensation function of the expansion joint.
[0032] Specifically, the second ring plate is provided with a through hole, the pull rod assembly passes through the through hole, and the gap between the pull rod assembly and the through hole can ensure that the distance between the working bellows and the balance bellows is unchanged during the whole working process while compensating the axial displacement.
[0033] Specifically, one end of the working bellows assembly is connected with the inlet pipe 1, the other end of the working bellows assembly is connected with the outlet pipe 19, one end of the pull rod assembly is connected on the inlet pipe 1, and the other end of the pull rod assembly is connected on the third connecting pipe 18.
[0034] Specifically, the pull rod assembly comprises the first ring plate 2, the short pull rod 3, the pull rod connecting cylinder 7, the long pull rod 14 and the third ring plate 17 connected in sequence, the first ring plate 2 is connected on the inlet pipe 1, the third ring plate 17 is connected on the third connecting pipe 18, the second ring plate 10 is located between the first ring plate 2 and the third ring plate 17, the long pull rod 14 passes through the second ring plate 10, and the long pull rod 14 has a gap with the second ring plate 10.
[0035] Preferably, the same radial dimension of the first ring plate and the third ring plate is circumferentially provided with a through hole, the number of the through holes is consistent with the number of the pull rods, and the number of the pull rods is determined according to the size of the pressure thrust and the diameter of the pull rod. The pull rods pass through the first ring plate and the third ring plate respectively.
[0036] Preferably, the connection mode of the short pull rod with the first ring plate and the connection mode of the long pull rod with the third ring plate are both welding.
[0037] Preferably, the first ring plate is sleeved outside the inlet pipe and welded.
[0038] Specifically, the short pull rod 3 is connected with the pull rod connecting cylinder 7, and the pull rod connecting cylinder 7 is connected with the long pull rod 14, and a spherical taper washer 4 is arranged at the connection position of the short pull rod 3 and the pull rod connecting cylinder 7 and the connection position of the pull rod connecting cylinder 7 and the long pull rod 14, and the spherical taper washer 4 is fixed by a nut. The arrangement can compensate the transverse displacement in various directions by cooperating with the deformation of the working bellows.
[0039] Specifically, the pull rod assembly further comprises a rib plate 16 connected with the third ring plate and / or the first ring plate. The rib plate is used to strengthen the rigidity of the third ring plate and the first ring plate.
[0040] Specifically, the first balance wave assembly comprises a first connecting pipe 11, a first balance bellow 12 and a second connecting pipe 15 connected in sequence, the first connecting pipe 11 is connected with the outlet pipe 19 through the second ring plate 10, the second connecting pipe 15 is connected with the third ring plate 17, and the through hole 191 is located between the second ring plate 10 and the second balance wave assembly.
[0041] Preferably, the first connecting pipe, the first balance bellow and the second connecting pipe are connected by welding.
[0042] Preferably, the left side of the first connecting pipe is welded with the right side of the second ring plate, and the inner diameter of the first connecting pipe is equal to the outer diameter of the second ring plate.
[0043] Preferably, the second connecting pipe is welded with the side of the third ring plate, the outer diameter of the third ring plate is the same as the outer diameter of the first ring plate and is greater than the outer diameter of the second connecting pipe. The third ring plate is sleeved outside the third connecting pipe and is welded and fixed, and the inner diameter of the third connecting pipe is greater than the outer diameter of the outlet pipe.
[0044] Specifically, the second balance wave assembly comprises a fourth connecting pipe 20 and a second balance bellow 13 connected in sequence, the fourth connecting pipe 20 is connected with the outlet pipe 19 through the fourth ring plate 21, and the second balance bellow 13 is connected with the third connecting pipe 18, and the through hole 191 is located between the second ring plate 10 and the fourth ring plate 21.
[0045] In the arrangement, the two groups of balance bellows are designed in a nested manner, so as to balance the pressure thrust of the working bellows and the balance bellows, and thus the installation length of the expansion joint can be effectively reduced while the expansion joint compensates the axial and transverse displacement.
[0046] Preferably, the fourth connecting pipe 20, the second balance bellow 13 and the third connecting pipe 18 are connected by welding.
[0047] Preferably, the second ring plate and the fourth ring plate are sleeved outside the outlet pipe and are welded and fixed, and the outer diameter of the second ring plate is greater than the outer diameter of the fourth ring plate. The arrangement improves the connection firmness of the first / second balance wave assembly.
[0048] Preferably, the fourth connecting pipe left side is welded with the fourth ring plate right side.
[0049] Specifically, the second ring plate 10, the first connecting pipe 11, the first balance bellows 12, the second connecting pipe 15, the third ring plate 17, the third connecting pipe 18, the second balance bellows 13, the fourth connecting pipe 20, the fourth ring plate 21 and the outlet pipe 19 jointly form a cavity, the through hole enables the working medium to enter the cavity, realizes the internal pressure of the first balance bellows, the external pressure of the second balance bellows, and the second ring plate left side and the outlet pipe left side can be arranged in the same cross section, so that the total length of the expansion joint can be shortened.
[0050] Specifically, the working wave assembly comprises a first working bellows 5 and a second working bellows 9, the inlet pipe 1 is connected with the first working bellows 5, the first working bellows 5 is connected with the second working bellows 9 through the connecting pipe 8, and the second working bellows 9 is connected with the outlet pipe 19.
[0051] Preferably, the connection modes of the inlet pipe and the first working bellows, the first working bellows and the connecting pipe, the connecting pipe and the second working bellows, and the second working bellows and the outlet pipe are all welding.
[0052] Specifically, the through hole is arranged on the outer wall of the outlet pipe and is arranged in a circle, and a plurality of through holes are arranged, preferably 6-10 through holes. The through hole is located between the second ring plate and the fourth ring plate, and the pipeline medium flows into the above-mentioned cavity through the through hole, so as to realize the internal pressure of the first balance bellows and the external pressure of the second balance bellows. The diameters and wave parameters of the first balance bellows and the second balance bellows are designed to satisfy that the effective area of the first balance bellows minus the effective area of the second balance bellows is equal to the effective area of the working bellows, so as to realize the balance of pressure thrust.
[0053] Specifically, when the pipeline medium flow rate is high, the flow guide cylinder 6 is arranged on the inner side of the first / second working bellows, and the flow guide cylinder is welded with the inner wall of the inlet pipe and the connecting pipe respectively. The flow guide cylinder can be a flange structure or a straight cylinder structure with a grommet. In addition, a protective cover structure can be arranged on the outer side of the working bellows to avoid bumping during transportation and installation of the expansion joint.
[0054] Specifically, there is a gap between the first working bellows, the second working bellows and the flow guide cylinder, which is used to realize the internal pressure state of the first working bellows and the second working bellows.
[0055] The novel straight pipe pressure balance expansion joint can be applied to the fields of petrochemical devices, large test devices and the like, and is suitable for occasions which require large axial displacement compensation capacity and large transverse displacement compensation capacity and have compact installation space.
[0056] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, therefore the protection scope of the utility model should be limited to the range defined by the claims.
Claims
1. A new straight tube pressure balanced expansion joint characterized in that, The working wave assembly, the first balance wave assembly, the second balance wave assembly and the pull rod assembly are connected, the working wave assembly is connected with the outlet pipe (19), the second ring plate (10) is connected at the connection, the pull rod assembly passes through the second ring plate (10), the first balance wave assembly is sleeved outside the second balance wave assembly, one end of the first balance wave assembly is connected with the second ring plate (10), the other end of the first balance wave assembly is connected with the third connecting pipe (18) through the pull rod assembly, one end of the second balance wave assembly is connected with the outlet pipe (19) through the fourth ring plate (21), the other end of the second balance wave assembly is connected with the third connecting pipe (18), the outlet pipe (19) and the third connecting pipe (18) have a gap, the through hole (191) is arranged on the outlet pipe (19), and the through hole (191) allows the working medium to enter the cavity formed by the first balance wave assembly and the second balance wave assembly.
2. Expansion joint according to claim 1, characterized in that One end of the working wave assembly is connected with the inlet pipe (1), the other end of the working wave assembly is connected with the outlet pipe (19), one end of the pull rod assembly is connected with the inlet pipe (1), and the other end of the pull rod assembly is connected with the third connecting pipe (18).
3. Expansion joint according to claim 2, characterized in that The pull rod assembly comprises a first ring plate (2), a short pull rod (3), a pull rod connecting barrel (7), a long pull rod (14) and a third ring plate (17) connected in sequence, the first ring plate (2) is connected with the inlet pipe (1), the third ring plate (17) is connected with the third connecting pipe (18), the second ring plate (10) is located between the first ring plate (2) and the third ring plate (17), and the long pull rod (14) passes through the second ring plate (10).
4. Expansion joint according to claim 3, characterized in that The short pull rod (3) and the pull rod connecting barrel (7) are provided with spherical taper surface washers (4) at the connecting positions.
5. Expansion joint according to claim 3, characterized in that The pull rod assembly further comprises a rib plate (16), and the rib plate (16) is connected with the third ring plate (17) and / or the first ring plate (2).
6. The expansion joint of claim 3, wherein, The first balance wave assembly comprises a first connecting pipe (11), a first balance wave pipe (12) and a second connecting pipe (15) connected in sequence, the first connecting pipe (11) is connected with the outlet pipe (19) through the second ring plate (10), the second connecting pipe (15) is connected with the third ring plate (17), and the through hole (191) is located between the second ring plate (10) and the second balance wave assembly.
7. The expansion joint of claim 3, wherein, The second balance wave assembly comprises a fourth connecting pipe (20) and a second balance wave pipe (13) connected in sequence, the fourth connecting pipe (20) is connected with the outlet pipe (19) through the fourth ring plate (21), and the second balance wave pipe (13) is connected with the third connecting pipe (18); the through hole (191) is located between the second ring plate (10) and the fourth ring plate (21).
8. The expansion joint of claim 3, wherein, The working wave assembly comprises a first working wave pipe (5) and a second working wave pipe (9), the inlet pipe (1) is connected with the first working wave pipe (5), the first working wave pipe (5) is connected with the second working wave pipe (9) through a connecting pipe (8), and the second working wave pipe (9) is connected with the outlet pipe (19).
9. The expansion joint of claim 1, wherein, The gap between the outlet pipe (19) and the third connecting pipe (18) is L, L=30-50mm.
10. The expansion joint of claim 1, wherein, The through holes (191) are 6-10.