CN211437671U - High-pressure sealing structure of hydraulic pipe expander - Google Patents
High-pressure sealing structure of hydraulic pipe expander Download PDFInfo
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- CN211437671U CN211437671U CN202020013358.9U CN202020013358U CN211437671U CN 211437671 U CN211437671 U CN 211437671U CN 202020013358 U CN202020013358 U CN 202020013358U CN 211437671 U CN211437671 U CN 211437671U
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Abstract
The utility model belongs to the technical field of hydraulic pipe expander, refer in particular to a high-pressure seal structure of hydraulic pipe expander, including pressure boost water cavity, hydraulic oil pocket and upper and lower both ends respectively communicate the piston slide opening of pressure boost water cavity and hydraulic oil pocket, be provided with the piston body in the hydraulic oil pocket, be provided with the piston rod on the piston body, and the piston rod sliding connection is in the piston slide opening, the sealing sleeve has high-pressure seal ring between piston rod and the piston slide opening, is located and is equipped with the sealing locking ring between the piston rod of high-pressure seal ring upside and the piston slide opening, and the lower extreme inner ring wall of sealing locking ring sets up the interior conical surface that internal diameter is big end down, sets up the external conical surface with interior conical surface looks adaptation on the; the utility model discloses with the help of lasting hydraulic effect, promote sealed lock ring and follow its axis downstream, the high-pressure seal circle encircles the fastening all the time on the piston rod under the cooperation of the interior conical surface and the outer conical surface to realize that wearing and tearing automatic compensation, leakproofness are good.
Description
The technical field is as follows:
the utility model belongs to the technical field of hydraulic pipe expander, refer in particular to a high-pressure seal structure of hydraulic pipe expander.
Background art:
the hydraulic tube expander is special hydraulic expansion connection equipment for expansion connection of tubes and tube plates in the manufacture of heat exchangers, condensers, high-pressure heaters and other equipment.
The hydraulic pipe expander comprises a pressurizing water cavity, a hydraulic oil cavity and a piston slide hole, wherein the upper end and the lower end of the piston slide hole are respectively communicated with the pressurizing water cavity and the hydraulic oil cavity; however, in the process of long-time reciprocating motion of the piston rod, the seal lip of the seal ring is inevitably worn, so that the sealing effect between the seal lip and the piston rod is increasingly poor, and finally, the water liquid in the pressurized water cavity flows to the hydraulic oil cavity along the gap between the seal lip and the piston rod, so that the oil in the hydraulic oil cavity is polluted.
The invention content is as follows:
the utility model aims at providing a high-pressure seal structure of hydraulic pipe expander that wearing and tearing automatic compensation, leakproofness are good.
The utility model discloses a realize like this:
a high-pressure sealing structure of a hydraulic pipe expander comprises a pressurizing water cavity, a hydraulic oil cavity and a piston slide hole, wherein the upper end and the lower end of the piston slide hole are respectively communicated with the pressurizing water cavity and the hydraulic oil cavity, a piston body is arranged in the hydraulic oil cavity, a piston rod is arranged on the piston body and is connected in the piston slide hole in a sliding mode, a high-pressure sealing ring is sleeved between the piston rod and the piston slide hole in a sealing mode, a sealing locking ring is arranged between the piston rod and the piston slide hole, the upper end inner ring wall of the sealing locking ring is provided with an inner conical surface with a small upper inner diameter and a large lower inner diameter, the upper end outer ring wall of the high-pressure sealing ring is provided with an outer conical surface matched with the inner conical surface, the sealing locking ring moves downwards relative to the sealing high-pressure ring, and.
In the above high-pressure sealing structure of the hydraulic pipe expander, the high-pressure sealing ring includes an upper end portion and a lower end portion, an inner ring wall of the upper end portion is connected with an outer wall surface of the piston rod in a sealing manner, an outer ring wall of the lower end portion is connected with an inner wall surface of the piston sliding hole in a sealing manner, and the outer conical surface is arranged at an outer edge of an upper port of the upper end portion.
In the above-mentioned high-pressure seal structure of hydraulic pipe expander, its characterized in that: an O-shaped ring I is hermetically sleeved between the upper end part and the piston sliding hole.
In the high-pressure sealing structure of the hydraulic pipe expander, an annular clamping groove is formed between the upper end part and the lower end part, and the O-shaped ring I is clamped on the annular clamping groove.
In the high-pressure sealing structure of the hydraulic pipe expander, the guide sleeve is sleeved in the piston slide hole, the piston rod is slidably connected to the inner hole of the guide sleeve, and the sealing locking ring and the high-pressure sealing ring are arranged below the guide sleeve.
In the high-pressure sealing structure of the hydraulic pipe expander, an O-ring II is arranged between the piston rod and the piston slide hole between the guide sleeve and the sealing locking ring.
In foretell hydraulic pipe expander's high-pressure seal structure, including output part, high pressure cylinder, organism, the hydro-cylinder that from top to bottom sets gradually, the pressure boost water cavity sets up on output part, the hydraulic pressure oil pocket sets up on the hydro-cylinder, has seted up through-hole one and through-hole two on high pressure cylinder and the organism respectively, and the concatenation forms about through-hole one and through-hole two the piston slide opening.
In the high-pressure sealing structure of the hydraulic pipe expander, the mounting groove is formed in the upper end opening of the second through hole, a mounting space is formed between the lower end face of the high-pressure cylinder and the groove bottom face of the mounting groove, the guide copper ring is sleeved on the piston rod located in the mounting space, and the lower end face of the high-pressure sealing ring is abutted to the upper end face of the guide copper ring.
In the above high-pressure sealing structure of the hydraulic pipe expander, the taper angle of the inner conical surface is 30 ° to 60 °.
Compared with the prior art, the utility model outstanding advantage is:
the utility model discloses with the help of lasting hydraulic effect, promote sealed lock ring and follow its axis downstream, the high-pressure seal circle encircles the fastening all the time on the piston rod under the cooperation of the interior conical surface and the outer conical surface to realize that wearing and tearing automatic compensation, leakproofness are good.
Description of the drawings:
FIG. 1 is a sectional view of the structure of the present invention;
FIG. 2 is an enlarged view at A of FIG. 1;
FIG. 3 is a perspective view of the sealing lock ring of the present invention;
FIG. 4 is a cross-sectional view of the seal lock ring of the present invention;
fig. 5 is a perspective view of the high-pressure seal ring of the present invention.
Description of the drawings: 1. a hydraulic oil chamber; 2. a pressurized water chamber; 3. a piston body; 31. a piston rod; 4. a sealing locking ring; 41. an inner conical surface; 5. a high pressure seal ring; 51. an outer conical surface; 52. an upper end portion; 53. a lower end portion; 54. an annular neck; 6. a first O-shaped ring; 7. a guide sleeve; 8. an O-shaped ring II; 9. a high pressure cylinder; 10. a body; 11. an oil cylinder; 12. a guiding copper ring; alpha, the angle of the taper angle of the inner conical surface.
The specific implementation mode is as follows:
the invention will now be further described with reference to specific embodiments, with reference to figures 1 to 5:
a high-pressure sealing structure of a hydraulic pipe expander comprises a pressurized water cavity 2, a hydraulic oil cavity 1 and a piston slide hole, wherein the upper end and the lower end of the piston slide hole are respectively communicated with the pressurized water cavity 2 and the hydraulic oil cavity 1, a piston body 3 is arranged in the hydraulic oil cavity 1, a piston rod 31 is arranged on the piston body 3, and the piston rod 31 is connected in the piston slide hole in a sliding manner, the high-pressure sealing ring 5 is sleeved between the piston rod 31 and the piston slide hole in a sealing manner, the sealing locking ring 4 is arranged between the piston rod 31 positioned on the upper side of the high-pressure sealing ring 5 and the piston slide hole, the inner annular wall at the lower end of the sealing locking ring 4 is provided with an inner conical surface 41 with a small inner diameter and a large inner diameter, the outer annular wall at the upper end of the high-pressure sealing ring 5 is provided with an outer conical surface 51 matched with the inner conical surface 41, the sealing locking ring 4 moves downwards relative to the high-pressure sealing ring 5, and the high-pressure sealing ring 5 is fastened on the piston rod 31 in an encircling manner.
The utility model discloses a theory of operation: in the use of the hydraulic pipe expander, when the inner side wall of the high-pressure sealing ring 5 is abraded due to the reciprocating motion of the piston rod 31, the sealing locking ring 4 is pushed to move downwards along the axis of the sealing locking ring by virtue of the continuous water pressure of the pressurizing water cavity 2, so that the inner conical surface 41 is always pressed on the outer conical surface 51, the inner side wall of the high-pressure sealing ring 5 is always fastened on the piston rod 31, and the automatic abrasion compensation is realized.
In order to make the high-pressure sealing ring 5 effectively play a role in sealing between the piston rod 31 and the piston slide hole, the specific structure of the high-pressure sealing ring 5 is as follows: the high-pressure seal ring 5 comprises an upper end portion 52 and a lower end portion 53, an inner ring wall of the upper end portion 52 is connected with an outer wall surface of the piston rod 31 in a sealing mode, an outer ring wall of the lower end portion 53 is connected with an inner wall surface of the piston slide hole in a sealing mode, and the outer conical surface 51 is arranged on the outer edge of an upper end opening of the upper end portion 52.
In order to further seal the gap between the high-pressure seal 5 and the piston slide hole, an O-ring I6 is hermetically sleeved between the upper end portion 52 and the piston slide hole.
In order to axially limit the O-ring I6 and prevent the O-ring I6 from sliding relatively, an annular clamping groove 54 is formed between the upper end portion 52 and the lower end portion 53, and the O-ring I6 is clamped on the annular clamping groove 54.
In order to ensure the coaxiality of the piston rod 31 and the high-pressure cylinder 9 and prevent the piston rod 31 from directly contacting and rubbing with the high-pressure cylinder 9, the guide sleeve 7 is sleeved in the piston sliding hole, the piston rod 31 is movably connected to the inner hole of the guide sleeve 7, and the sealing locking ring 4 and the high-pressure sealing ring 5 are arranged below the guide sleeve 7.
Furthermore, under the action of the water pressure of the pressurized water cavity 2, in order to prevent the guide sleeve 7 and the sealing and locking ring 4 from being directly contacted and abraded mutually, an O-shaped ring II 8 is arranged between the piston rod 31 and the piston sliding hole between the guide sleeve 7 and the sealing and locking ring 4.
The hydraulic pipe expander comprises an output part, a high-pressure cylinder 9, a machine body 10 and an oil cylinder 11 which are sequentially arranged from top to bottom, wherein a pressurized water cavity 2 is arranged on the output part, a hydraulic oil cavity 1 is arranged on the oil cylinder 11, a first through hole and a second through hole are respectively formed in the high-pressure cylinder 9 and the machine body 10, and the first through hole and the second through hole are spliced to form the piston slide hole.
In order to axially limit the lower end face of the high-pressure sealing ring 5, the upper port of the second through hole is provided with a mounting groove, a mounting space is formed between the lower end face of the high-pressure cylinder 9 and the groove bottom face of the mounting groove, a guide copper ring 12 is sleeved on a piston rod 31 positioned in the mounting space, and the lower end face of the high-pressure sealing ring 5 is abutted against the upper end face of the guide copper ring 12.
Preferably, the angle α of the taper angle of the inner tapered surface is 30 ° to 60 °. In this embodiment, the taper angle α of the inner tapered surface is 30 °.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so: all equivalent changes made according to the shape, structure and principle of the utility model are covered within the protection scope of the utility model.
Claims (9)
1. The utility model provides a high-pressure seal structure of hydraulic pipe expander, including booster water cavity (2), hydraulic pressure oil pocket (1) and upper and lower both ends communicate the piston slide opening of booster water cavity (2) and hydraulic pressure oil pocket (1) respectively, be provided with piston body (3) in hydraulic pressure oil pocket (1), be provided with piston rod (31) on piston body (3), and piston rod (31) sliding connection is in the piston slide opening, its characterized in that: the sealing sleeve is provided with a high-pressure sealing ring (5) between the piston rod (31) and the piston sliding hole, a sealing locking ring (4) is arranged between the piston rod (31) positioned on the upper side of the high-pressure sealing ring (5) and the piston sliding hole, an inner conical surface (41) with a small inner diameter and a large inner diameter is arranged on the inner annular wall of the lower end of the sealing locking ring (4), an outer conical surface (51) matched with the inner conical surface (41) is arranged on the outer annular wall of the upper end of the high-pressure sealing ring (5), the sealing locking ring (4) moves downwards relative to the high-pressure sealing ring (5), and the high-pressure sealing ring (5) is fastened on the piston rod (31) in an encircling manner through the matching connection of.
2. The high-pressure seal structure of the hydraulic pipe expander according to claim 1, wherein: the high-pressure sealing ring (5) comprises an upper end portion (52) and a lower end portion (53), an inner ring wall of the upper end portion (52) is connected with an outer wall surface of the piston rod (31) in a sealing mode, an outer ring wall of the lower end portion (53) is connected with an inner wall surface of the piston sliding hole in a sealing mode, and the outer conical surface (51) is arranged on the outer edge of an upper end opening of the upper end portion (52).
3. The high-pressure seal structure of the hydraulic pipe expander according to claim 2, wherein: and a first O-shaped ring (6) is hermetically sleeved between the upper end part (52) and the piston sliding hole.
4. The high-pressure seal structure of the hydraulic pipe expander according to claim 3, wherein: an annular clamping groove (54) is formed between the upper end portion (52) and the lower end portion (53), and the O-shaped ring I (6) is clamped on the annular clamping groove (54).
5. The high-pressure seal structure of the hydraulic pipe expander according to claim 1, wherein: the piston is characterized in that a guide sleeve (7) is sleeved in the piston sliding hole, the piston rod (31) is connected to an inner hole of the guide sleeve (7) in a sliding mode, and the sealing locking ring (4) and the high-pressure sealing ring (5) are arranged below the guide sleeve (7).
6. The high-pressure seal structure of the hydraulic pipe expander according to claim 5, wherein: and an O-shaped ring II (8) is arranged between the piston rod (31) positioned between the guide sleeve (7) and the sealing locking ring (4) and the piston sliding hole.
7. The high-pressure seal structure of the hydraulic pipe expander according to claim 1, wherein: including output portion, high pressure cylinder (9), organism (10), hydro-cylinder (11) that from top to bottom set gradually, pressure boost water cavity (2) set up on output portion, hydraulic oil chamber (1) sets up on hydro-cylinder (11), has seted up through-hole one and through-hole two on high pressure cylinder (9) and organism (10) respectively, and concatenation formation about through-hole one and through-hole two the piston slide opening.
8. The high-pressure seal structure of the hydraulic pipe expander according to claim 7, wherein: the upper port of the second through hole is provided with a mounting groove, a mounting space is formed between the lower end face of the high-pressure cylinder (9) and the groove bottom face of the mounting groove, a guide copper ring (12) is sleeved on a piston rod (31) located in the mounting space, and the lower end face of the high-pressure sealing ring (5) is abutted against the upper end face of the guide copper ring (12).
9. The high-pressure seal structure of the hydraulic pipe expander according to any one of claims 1 to 8, wherein: the cone angle (alpha) of the inner conical surface is 30-60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020013358.9U CN211437671U (en) | 2020-01-02 | 2020-01-02 | High-pressure sealing structure of hydraulic pipe expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020013358.9U CN211437671U (en) | 2020-01-02 | 2020-01-02 | High-pressure sealing structure of hydraulic pipe expander |
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| Publication Number | Publication Date |
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| CN211437671U true CN211437671U (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020013358.9U Active CN211437671U (en) | 2020-01-02 | 2020-01-02 | High-pressure sealing structure of hydraulic pipe expander |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117450204A (en) * | 2023-12-22 | 2024-01-26 | 江苏耐玛鑫精密机械有限公司 | Nitrogen spring sealing structure and working principle thereof |
-
2020
- 2020-01-02 CN CN202020013358.9U patent/CN211437671U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117450204A (en) * | 2023-12-22 | 2024-01-26 | 江苏耐玛鑫精密机械有限公司 | Nitrogen spring sealing structure and working principle thereof |
| CN117450204B (en) * | 2023-12-22 | 2024-03-08 | 江苏耐玛鑫精密机械有限公司 | Nitrogen spring sealing structure and working method thereof |
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