CN116351967A - Wolf tooth stick type expansion joint device - Google Patents
Wolf tooth stick type expansion joint device Download PDFInfo
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- CN116351967A CN116351967A CN202111618497.XA CN202111618497A CN116351967A CN 116351967 A CN116351967 A CN 116351967A CN 202111618497 A CN202111618497 A CN 202111618497A CN 116351967 A CN116351967 A CN 116351967A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
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Abstract
The invention provides a wolf tooth stick expansion joint device, which comprises a base and a plurality of groups of hydraulic units arranged on the base, wherein the base is provided with a central oil hole which extends along the axis of the base and passes through the axis, the plurality of hydraulic units in each group of hydraulic units are uniformly distributed in a radial way by taking the central oil hole as the center, one end of a piston cavity of each hydraulic unit is communicated with the central oil hole through a communication hole, the hydraulic units with the same movement direction and synchronous movement of piston rods in the plurality of groups of hydraulic units form a liquid discharge unit, two edge oil holes parallel to the central oil hole are arranged on the base corresponding to each liquid discharge unit, the two edge oil holes are respectively positioned on two sides of the axis of the piston cavity of the liquid discharge unit, and one end, far away from the communication hole, of the piston cavity of each hydraulic unit in the liquid discharge unit is communicated with the two edge oil holes arranged for the liquid discharge unit. The invention provides a wolf tooth stick type expansion joint device which can overcome the defects of small expansion joint amplitude and low axial bearing capacity formed by expansion joint of the traditional expansion joint device.
Description
Technical Field
The invention relates to the field of pipeline preparation, in particular to a wolf tooth stick type expansion joint device.
Background
In the prior art, seamless steel pipes are widely used in oil and gas exploitation. The common oil pipe comprises pipe bodies and connectors, and the pipe bodies are connected and sealed through conical buckles at two ends of the connectors. The multi-section pipeline is connected in series and extends into the well, and the phenomena of abrasion, corrosion, scaling of the pipe wall, screw thread damage of the taper pipe and the like of the oil pipe are easily caused by complex working conditions under the well and reciprocating motion of the sucker rod. Metal tubing damage will necessarily lead to frequent workover, decreasing oil and gas production efficiency and leading to increased oil and gas production costs.
The oil pipe is easy to wear and corrode and the pipe wall is scaled, the inner wall of the oil pipe is coated at present, and the rust removing work of the inner wall of the pipe body is difficult to clean and thoroughly, so that the adhesive force of the inner wall coating is low, and particularly, the coating with low adhesive force can be gradually peeled off and separated in the use process, and the dropped coating impurities can even cause pump clamping accidents, so that the technical application of the inner coating of the oil pipe is limited.
The prior advanced technical means for solving various problems of the oil pipe is to additionally install a polyethylene lining on the inner wall of the pipeline, so that the problems of abrasion, corrosion, pipe wall scaling and the like of the oil pipe body can be solved to a certain extent. However, due to the lining material, the adding process and the like, the lining and the pipe body are not good in laminating performance at present, so that the lining is peeled off and loosened, the service life is unstable and the like. On the other hand, the inner surface of the pipe body is required to be treated cleanly and the requirement of treatment is high, and complicated processes such as diameter reduction, pipe penetration, heating and flanging are required for the inner liner during installation, so that the manufacturing cost of the inner liner is high, and the inner liner is difficult to popularize and apply.
Patent CN107351344a discloses a method for preparing a nonmetallic oil pipe used in an oil-gas field, which comprises a pipe body and a coupling, wherein the pipe body and the coupling comprise a heat-resistant layer pipe, a middle reinforcing layer pipe and an anti-corrosion layer pipe, the heat-resistant layer pipe is a heat-resistant high polymer formed by polymerizing polyethylene with a molecular weight of 150-320 ten thousand or butadiene under the catalysis of a rigid catalyst, the middle reinforcing layer pipe is composed of medium-high pressure resistant glass fiber, reinforced polyethylene fiber, aramid fiber, polyethylene fiber and reticular high-strength steel wire, and the anti-corrosion layer pipe is polyethylene with a molecular weight of 250-420 ten thousand.
The scheme adopts the mode that the inner layer and the outer layer of the composite pipe are directly manufactured into the cone buckle for connection: the inner diameter of each inner conical boss is provided with a through-body inner conical pipe thread through screw thread compression molding, the nominal inner diameter of an inner conical pipe butterfly and a thread is equal to the nominal outer diameter of an outer conical pipe thread, the through-body inner conical pipe threads of the coupling are connected with the outer conical pipe threads of two adjacent pipe bodies, and the like. "
In further research, the inventor finds that the oil pipe joint is directly manufactured by adopting screw thread compression molding, the connection strength is very limited, and the main characteristic is that the reinforcing layer of the middle core of the composite pipeline is difficult to continuously transmit axial force, and the axial force of the joint part is borne by the high polymer of the inner liner layer or the outer protective layer. In particular, in a high-temperature downhole environment, the polymer material is softened to a certain extent, and the mechanical properties are further reduced. Therefore, the inventor provides a brand-new underground pipe string expansion joint process, and the technology is a brand-new taper buckle joint connection method. However, no prior art can be used for connecting a metal joint with a composite pipeline at present, and the main problem is that a large axial force exists in a downhole tubular column, so that the conventional metal joint is difficult to connect with the composite pipeline. Therefore, the auxiliary tool and the method for connecting the metal joint with the composite pipeline have practical significance and application prospect.
The existing expansion joint technology is mainly embodied in the fixation and sealing of thin-wall tube bundles, such as thin-wall metal pipelines in heat exchangers and air conditioners; and the related art and equipment related art for cleaving rock in an expanded manner in rock mining are collated as follows.
Patent CN201310146272 discloses a method for expanding heat exchange tube and tube plate and anti-impact sleeve. The first step: expansion joint of the heat exchange tube and the tube plate, the heat exchange tube area with the anti-impact sleeve is not expanded joint, and the expansion joint length L3=the length L1 of the heat exchange tube and the length L2 of the anti-impact sleeve; and a second step of: the heat exchange tube is expanded and connected with the anti-impact sleeve, and the expansion and connection length is L2. By adopting the expansion joint method of the heat exchange tube, the tube plate and the anti-flushing sleeve, the anti-flushing sleeve area is not repeatedly expanded, the service life of the heat exchange tube in the anti-flushing sleeve area is protected, and the problems that the anti-flushing sleeve and the heat exchange tube are not tightly attached and are easy to fall off in a high-pressure heater product are thoroughly solved; the problem of the broken expansion rod when heat exchange tube and tube sheet expand and connect is solved. The core technology of the scheme is to carry out graded expansion connection on the position of the middle section of the heat exchange tube close to the baffle plate, so that the connection effect of the heat exchange tube and the baffle plate is ensured. The scheme only uses expansion connection installation with the small-diameter heat exchange tube, and is not suitable for the problem of high-strength connection of underground tubular columns.
Patent CN201511026581 discloses an integral expansion joint device for a fuel assembly skeleton. Including expansion joint subassembly, lifting unit, support, locating component, wherein the support is located the lower extreme, supports whole expansion joint device, sets up lifting unit on the support, and lifting unit can go up and down to drive expansion joint subassembly and locating component and go up and down jointly, set up locating component at lifting unit forefront, locating component is used for the position location to the expansion joint, still sets up expansion joint subassembly on lifting unit, expansion joint subassembly includes a plurality of expansion joint pipes, and expansion joint once can all be independently accomplished to every expansion joint pipe. The invention has the remarkable effects that: the new process of integrally expanding and connecting the skeleton guide pipe and the sleeve pipe is adopted to carry out 700 groups of integral expansion and connection, the size and the tensile inspection of the expansion and connection test sample are all qualified, the flatness inspection of the sleeve pipe end of the skeleton product is all qualified (the requirement is less than or equal to 0.15 mm), and the expansion and connection tensile force value (the requirement is 4500N). The core technology of the process is that an expansion rod, a sleeve pipe, a guide pipe and an expansion sleeve are matched, and the expansion sleeve is ejected out through the conical surface of the expansion rod. The expansion sleeve in the scheme has limited expansion angle, is only suitable for small-amplitude expansion joint, and is not suitable for connection of underground pipe columns.
Disclosure of Invention
The invention provides a wolf tooth stick type expansion joint device, which can overcome the defects of small expansion joint amplitude and low axial bearing capacity formed by expansion joint of the traditional expansion joint device.
The invention relates to a wolf tooth stick expansion joint device, which comprises: the base is in a column shape with an axis, the base is provided with a central oil hole which extends along the axis and passes through the axis, a plurality of hydraulic units in each group of hydraulic units are uniformly distributed in a radial mode by taking the central oil hole as the center, each hydraulic unit comprises a piston cavity formed in the base, a piston body positioned in the piston cavity and a piston rod fixed with the piston body, one end of the piston cavity of each hydraulic unit is communicated with the central oil hole through a communication hole, the hydraulic units with the same piston rod moving direction in the plurality of groups of hydraulic units simultaneously form a hydraulic unit, two edge oil holes which are parallel to the central oil hole are formed in the base and correspond to each hydraulic unit, the two edge oil holes are respectively positioned on two sides of the axis of the piston cavity of each hydraulic unit, and one end, far away from the communication hole, of the piston cavity of each hydraulic unit is communicated with the two edge oil holes formed for the hydraulic unit.
Preferably, the hydraulic unit further comprises a cylinder cover matched with the opening of the piston cavity, the cylinder cover is provided with a through hole allowing the piston rod to extend out, a limiting device limiting the movement stroke of the piston body to the cylinder cover is arranged in the piston cavity, the distance between the limiting device and the central oil hole is L1, and the distance between the edge of the edge oil hole, which is close to the central oil hole, and the central oil hole is L2, and L1 is less than or equal to L2.
Preferably, the cylinder cover comprises a cylinder cover body capable of being fixed with the base and a first boss protruding into the piston cavity from the cylinder cover body, the first boss is provided with a first wall parallel to the axis of the base and a second wall perpendicular to the first wall and connected with the first wall, the second wall is cylindrical, the first wall forms the limiting device, the distance between one side of the first wall, which is close to the central oil hole, and the central oil hole is L1, the outer diameter of the second wall is smaller than the diameter of the piston cavity, and a space allowing hydraulic oil to pass through is formed between the outer wall of the second wall and the inner wall of the piston cavity. The inner wall of the second wall of the first boss is provided with a sealing groove extending circumferentially around the second wall, and the sealing groove is provided with a sealing ring.
Preferably, the cylinder cover further comprises a second boss protruding out of the piston cavity from the cylinder cover body, the second boss is provided with a first wall parallel to the axis of the base and a second wall perpendicular to the first wall and connected with the first wall, the second wall is cylindrical, the inner wall of the second wall is provided with a seal groove extending around the axial direction, a seal ring is arranged in the seal groove, the first wall of the first boss and the first wall of the second boss are respectively provided with a through hole, and the through holes of the first boss and the through holes of the second boss are opposite to each other to form the through holes of the cylinder cover. As a further preferred aspect, the cylinder head body, the first boss and the second boss are integrally formed.
Preferably, the base is provided with a sinking step formed around the opening of the piston cavity, and the cylinder cover body is fixedly arranged in the sinking step.
Preferably, the piston rod is integrally formed with the piston body. As a further preferred aspect, a ram is provided at an end of the piston rod extending from the cylinder head, the ram having a curved surface protruding outward in a radial direction of the base.
Preferably, the base is a regular hexagonal prism, the side surface of the base comprises a first wall surface, a second wall surface, a third wall surface, a fourth wall surface, a fifth wall surface and a sixth wall surface which are sequentially arranged, the spike expansion device comprises three hydraulic units, and openings of piston cavities of the three hydraulic units are located on the first wall surface, the third wall surface and the fifth wall surface in a one-to-one correspondence mode.
Preferably, the base is provided with two edge oil holes for each liquid discharge unit, and the two edge oil holes are symmetrically distributed relative to the axial direction of the piston cavity of the liquid discharge unit.
Compared with the prior art, the wolf tooth stick type expansion joint device has the following beneficial effects:
1. through the spike rod type expansion joint device, all the hydraulic units can synchronously act, so that all the piston rods outwards move to abut against the inner wall of the inner tube, the inner tube is radially outwards deformed, the deformation of the portion abutted by the piston rods is larger than that of the portion not abutted against the piston rods, a plurality of bulges protruding outwards are formed on the inner tube, the inner wall of the outer tube is correspondingly deformed to form a plurality of pits, and the bulges extend into the pits. This aspect allows for a tighter bond between the inner and outer tube walls while providing a perpendicular to the axial fit between the raised and recessed sidewalls, thus taking up the forces of the larger axis.
2. The piston cavity of the spike rod type expansion joint device is internally provided with the limiting device for limiting the outward movement stroke of the piston body, so that the piston body cannot reach the communication position of the edge oil hole and the piston cavity in the radial outward direction, and the piston body is prevented from blocking the communication position of the edge oil hole and the piston cavity.
3. The base of the wolf tooth stick expansion joint device is provided with two edge oil holes for each liquid discharge unit, and the two edge oil holes are symmetrically distributed relative to the axial direction of a piston cavity of the liquid discharge unit. The symmetrical distribution causes the fluid to flow in two symmetrical directions, so that the force applied to the piston body is symmetrical, and the piston body does not deflect or vibrate relative to the axis of the piston cavity.
Drawings
FIG. 1 is a schematic view of a broken-away structure of a base of an embodiment of a wolf's spike expansion device of the present invention;
FIG. 2 is a partial cross-sectional view of one embodiment of the present invention of a wolf's spike expansion device;
FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention of a wolf's spike expansion device;
FIG. 4 is a schematic view of an embodiment of the present invention of a spike expansion device with the ram retracted inwardly;
fig. 5 is a schematic view of an embodiment of the present invention of a spike expansion device when the ram is pushed outward.
Reference numerals
1 a base, 11 a central oil hole, 12 a piston cavity, 13 a communication hole, 14 an opening, 15 an edge oil hole, 16 a sinking step, a first wall surface, b a second wall surface, c a third wall surface, d a fourth wall surface, e a fifth wall surface and f a sixth wall surface;
2 cylinder cover, 21 cylinder cover body, 22 first boss, 221 first wall, 222 second wall, 223 sealing groove, 224 sealing ring, 23 second boss, 231 first wall, 232 second wall, 233 sealing groove, 234 sealing ring, 24 screw;
the piston body is provided with a 31 sealing groove and a 32 sealing ring;
4 piston rod, 41 ram.
Detailed Description
The invention provides a wolf tooth stick type expansion joint device which is used for radially expanding and deforming a pipe body positioned inside so as to be tightly combined with a pipe body positioned outside. As shown in fig. 1 to 3, the wolf's spike expansion joint device of the present invention comprises: the base 1 is in a column shape with an axis, the base 1 is provided with a central oil hole 11 extending along the axis and passing through the axis, a plurality of hydraulic units in each group of hydraulic units are uniformly distributed in a radial shape by taking the central oil hole 11 as the center, each hydraulic unit comprises a piston cavity 12 formed on the base 1, a piston body 3 positioned in the piston cavity 12 and a piston rod 4 fixed with the piston body 3, one end of the piston cavity 12 of each hydraulic unit is communicated with the central oil hole 11 through a communication hole 13, the hydraulic units with the same movement direction and synchronous movement of the piston rod 4 in the plurality of groups of hydraulic units form a liquid discharge pressure unit, two edge oil holes 15 parallel to the central oil hole 11 are arranged on the base 1 and are respectively positioned on two sides of the axis of the piston cavity 12 of the liquid discharge pressure unit, and one end of the piston cavity 12 of each hydraulic unit far away from the communication hole 13 is communicated with the two edge oil holes 15 formed for the liquid discharge pressure unit. Wherein the central oil hole 11 is connected with a liquid supply pipeline, and the edge oil hole 15 is connected with a liquid withdrawal pipeline.
The appearance of the expansion joint device of the present invention looks like a wolf's teeth bar, i.e. the base 1 looks like a bar body of the wolf's teeth bar, and the piston rod 4 of the hydraulic unit looks like a protrusion arranged on the bar body. In use, the wolf's spike expansion device is placed inside the inner tube and keeps its base 1 axis coaxial with the inner tube. In the initial state, as shown in fig. 2 and 4, the piston rod 4 is retracted inward, and the piston body 3 approaches the bottom wall of the piston chamber 12 and the communication hole 13. The hydraulic oil in the central oil hole 11 is driven by the pump to enter the piston chamber 12 through the communication hole 13 and drive the piston body 3 and the piston rod 4 to move outwards, and simultaneously the hydraulic oil on the other side of the piston body 3 flows into the liquid withdrawal line (not shown) through the edge oil hole 15. The piston body 3 is provided with a sealing groove 31, and a sealing ring 32 is arranged in the sealing groove 31. All the hydraulic units synchronously act and outwards prop against the inner wall of the inner tube, the inner tube deforms radially outwards, the deformation of the part propped outwards is larger than that of the part not propped, and therefore, a plurality of bulges protruding outwards are displayed on the inner tube, the inner wall of the outer tube also deforms correspondingly to form a plurality of pits, and the bulges extend into the pits. This aspect allows for a tighter bond between the inner and outer tube walls while providing a perpendicular to the axial fit between the raised and recessed sidewalls, thus taking up the forces of the larger axis.
As shown in fig. 1 and 3, the hydraulic unit further comprises a cylinder cover 2 which is matched with an opening 14 of the piston cavity 12, the cylinder cover 2 is provided with a through hole for allowing the piston rod 4 to extend, and a limiting device for limiting the outward movement stroke of the piston body 3 is arranged in the piston cavity 12, and the specific structure and reference numerals of the limiting device will be described in detail later. In the direction perpendicular to the axis of the base 1, the distance between the limiting device and the axis of the central oil hole 11 is L1, the radial distance between the edge of the edge oil hole 15, which is close to the central oil hole 11, and the central oil hole 11 is L2, and L1 is less than or equal to L2, so that the piston body 3 cannot reach the communication position between the edge oil hole 15 and the piston cavity 12 in the radial outward direction, and the piston body 3 is prevented from blocking the communication position between the edge oil hole 15 and the piston cavity 12.
As shown in fig. 2 and 3, the cylinder head 2 includes a head body 21 that can be fixed to the base 1 and a first boss 22 that protrudes from the head body 21 into the piston chamber 12, in this embodiment, the head 2 is fixed to the base 1 by a screw 24, the first boss 22 has a first wall 221 parallel to the axis of the base 1 and a second wall 222 perpendicular to the first wall 221 and connected to the first wall 221, the second wall 222 is cylindrical, the second wall 222 constitutes the stopper, a radial distance from a side of the first wall 221 near the center oil hole 11 in a direction perpendicular to the axis of the base 1 is the L1, an outer diameter of the second wall 222 is smaller than a diameter of the piston chamber 12, and a space allowing hydraulic oil to pass through is formed between an outer wall of the second wall 222 and an inner wall of the piston chamber 12. The inner wall of the second wall 222 of the first boss 22 is provided with a sealing groove 223, and the sealing groove 223 is provided with a sealing ring 224. The sealing ring 224 forms a first dynamic seal between the cylinder head 2 and the piston rod 4.
The cylinder head 2 further includes a second boss 23 protruding from the cylinder head body 21 to the outside of the piston chamber 12, and in this embodiment, the cylinder head body 21, the first boss 22, and the second boss 23 are integrally formed. The second boss 23 has a first wall 231 parallel to the axis of the base 1 and a second wall 232 perpendicular to the first wall 231 and connected to the first wall 231, the second wall 232 is cylindrical, the inner wall of the second wall 232 is provided with a sealing groove 233, and a sealing ring 234 is arranged in the sealing groove 233 to form a second dynamic seal between the cylinder cover 2 and the piston rod 4. The first wall 221 of the first boss 22 and the first wall 231 of the second boss 23 each have a through hole, and the through hole of the first boss 22 and the through hole of the second boss 23 are opposite to each other to constitute the through hole of the cylinder head 2.
As shown in fig. 1 and 2, the base 1 is provided with a sinking step 16 formed around the opening 14 of the piston chamber 12, and the cylinder head body 21 is fixedly installed in the sinking step 16, so that the connection between the cylinder head 2 and the base 1 is firmer and a more reliable seal can be formed between the two. In the present embodiment, the head body 21 is fixedly coupled to the base 1 by the screw 24.
In the present embodiment, the piston rod 4 is integrally formed with the piston body 3. The piston rod 4 is provided with a pressure head 41 at one end extending out of the cylinder cover 2, and the pressure head 41 has a curved surface protruding outwards in the radial direction of the base 1. Preferably, the ram 41 has a top surface with a partial spherical or partial ellipsoidal surface, which faces the inner wall when the expansion device is placed into the inner tube. The ram 41 may be integrally formed with the piston rod 4 or may be fixed to an end of the piston rod 4. In the present embodiment, the ram 41 is integrally formed with the piston rod 4, that is, the ram 41 is formed by machining a partial spherical surface or a partial elliptic surface at the end of the piston rod 4. Of course, in other embodiments, the top pressing surface may be of other shapes.
In this embodiment, the base 1 is a regular hexagonal prism, the side surface of the base includes a first wall surface a, a second wall surface b, a third wall surface c, a fourth wall surface d, a fifth wall surface e and a sixth wall surface f, which are sequentially arranged, and the spike expansion device includes three hydraulic fluid units, and openings 14 of piston chambers 12 of the three hydraulic fluid units are located on the first wall surface a, the third wall surface c and the fifth wall surface e in a one-to-one correspondence.
As shown in fig. 4 and 5, the base 1 is provided with two edge oil holes 15 for each hydraulic unit, and the two edge oil holes 15 are symmetrically distributed with respect to the axial direction of the piston chamber 12 of the hydraulic unit. The symmetrical distribution causes the liquid to flow in two symmetrical directions, so that the forces to which the piston body 3 is subjected are also symmetrical, the piston body 3 being free from deflection or vibration with respect to the axis of the piston chamber 12.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent substitutions of the invention will occur to those skilled in the art, which are within the spirit and scope of the invention.
Claims (11)
1. A wolf's tooth stick formula expansion joint device, characterized by comprising: the base is in a column shape with an axis, the base is provided with a central oil hole which extends along the axis and passes through the axis, a plurality of hydraulic units in each group of hydraulic units are uniformly distributed in a radial mode by taking the central oil hole as the center, each hydraulic unit comprises a piston cavity formed in the base, a piston body positioned in the piston cavity and a piston rod fixed with the piston body, one end of the piston cavity of each hydraulic unit is communicated with the central oil hole through a communication hole, the hydraulic units with the same movement direction and synchronous movement of the piston rods in the plurality of groups of hydraulic units form a hydraulic unit, two edge oil holes parallel to the central oil hole are formed in the base corresponding to each hydraulic unit, the two edge oil holes are respectively positioned on two sides of the axis of the piston cavity of each hydraulic unit, and one end, far away from the communication hole, of the piston cavity of each hydraulic unit is communicated with two edge oil holes formed for the hydraulic unit.
2. The wolf's tooth stick expansion joint device according to claim 1, wherein the hydraulic unit further comprises a cylinder cover matched with the opening of the piston cavity, the cylinder cover is provided with a through hole allowing the piston rod to extend out, a limiting device limiting the movement stroke of the piston body to the cylinder cover is arranged in the piston cavity, the distance between the limiting device and the central oil hole is L1, and the distance between the edge of the edge oil hole, which is close to the central oil hole, and the central oil hole is L2, and L1 is less than or equal to L2.
3. The wolf's spike expansion joint device according to claim 2, wherein the cylinder cover comprises a cylinder cover body which can be fixed with the base and a first boss protruding from the cylinder cover body into the piston cavity, the first boss has a first wall parallel to the axis of the base and a second wall perpendicular to the first wall and connected with the first wall, the second wall is cylindrical, the first wall forms the limiting device, the distance from one side of the first wall close to the central oil hole is L1, the outer diameter of the second wall is smaller than the diameter of the piston cavity, and a space allowing hydraulic oil to pass through is formed between the outer wall of the second wall and the inner wall of the piston cavity.
4. The wolf's teeth bar type expansion joint device as claimed in claim 3, wherein the inner wall of the second wall of the first boss is provided with a sealing groove extending circumferentially around, and the sealing groove is provided with a sealing ring.
5. The wolf's tooth stick expansion joint device according to claim 3, wherein the cylinder cover further comprises a second boss protruding from the cylinder cover body to the outside of the piston cavity, the second boss is provided with a first wall parallel to the axis of the base and a second wall perpendicular to the first wall and connected with the first wall, the second wall is cylindrical, the inner wall of the second wall is provided with a sealing groove extending around the axial direction, a sealing ring is arranged in the sealing groove, the first wall of the first boss and the first wall of the second boss are provided with through holes, and the through holes of the first boss and the through holes of the second boss are opposite to form the through holes of the cylinder cover.
6. The wolf's spike expansion joint device of claim 5 wherein said cylinder head body, first boss and second boss are integrally formed.
7. The wolf's spike expansion joint device of claim 6 wherein said base is provided with a countersunk step formed around the opening of said piston chamber, said cylinder head body being fixedly mounted within said countersunk step.
8. The wolf's spike expansion device of claim 1 wherein said piston rod is integrally formed with said piston body.
9. The wolf's spike expansion joint device of claim 1 wherein a ram is provided at an end of the piston rod extending from the cylinder head, the ram having a curved surface protruding outwardly in a radial direction of the base.
10. The wolf's tooth stick type expansion joint device as claimed in claim 1, wherein the base is a regular hexagonal prism, the side surface of the base comprises a first wall surface, a second wall surface, a third wall surface, a fourth wall surface, a fifth wall surface and a sixth wall surface which are sequentially arranged, the wolf's tooth stick type expansion joint device comprises three liquid discharging pressure units, and openings of piston cavities of the three liquid discharging pressure units are located on the first wall surface, the third wall surface and the fifth wall surface in a one-to-one correspondence mode.
11. The wolf's spike expansion joint device of claim 1, wherein said base is provided with two said rim oil holes for each fluid discharge unit, said two rim oil holes being symmetrically distributed with respect to the axial direction of said piston chamber of the fluid discharge unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111618497.XA CN116351967A (en) | 2021-12-27 | 2021-12-27 | Wolf tooth stick type expansion joint device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111618497.XA CN116351967A (en) | 2021-12-27 | 2021-12-27 | Wolf tooth stick type expansion joint device |
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| Publication Number | Publication Date |
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| CN116351967A true CN116351967A (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111618497.XA Pending CN116351967A (en) | 2021-12-27 | 2021-12-27 | Wolf tooth stick type expansion joint device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117388071A (en) * | 2023-12-11 | 2024-01-12 | 南京麦驰钛业有限公司 | Flexible expansion joint pull-out force test device for heat exchange tube and tube plate |
-
2021
- 2021-12-27 CN CN202111618497.XA patent/CN116351967A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117388071A (en) * | 2023-12-11 | 2024-01-12 | 南京麦驰钛业有限公司 | Flexible expansion joint pull-out force test device for heat exchange tube and tube plate |
| CN117388071B (en) * | 2023-12-11 | 2024-02-13 | 南京麦驰钛业有限公司 | Flexible expansion joint pull-out force test device for heat exchange tube and tube plate |
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