CN219388295U - Piston rod sealing structure, hydraulic cylinder and hydraulic hoist - Google Patents
Piston rod sealing structure, hydraulic cylinder and hydraulic hoist Download PDFInfo
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- CN219388295U CN219388295U CN202320373505.7U CN202320373505U CN219388295U CN 219388295 U CN219388295 U CN 219388295U CN 202320373505 U CN202320373505 U CN 202320373505U CN 219388295 U CN219388295 U CN 219388295U
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Abstract
The utility model relates to the technical field of hydraulic sealing, and aims to provide a piston rod sealing structure, a hydraulic cylinder and a hydraulic hoist. The piston rod sealing structure has the advantages that leakage can not occur even if the axis of the piston rod is deviated, and the sealing effect is good. The piston rod sealing structure comprises: the device comprises an end cover, a piston rod, a rotating piece and a sealing assembly; the end cover has a hollow structure; the piston rod passes through the end cover; the rotating piece is arranged between the end cover and the piston rod, the outer wall of the rotating piece is in rotary contact with the inner wall of the end cover, the inner wall of the rotating piece is in sliding contact with the outer wall of the piston rod, and the piston rod is suitable for driving the rotating piece to rotate under the driving of gravity; the seal assembly includes a first seal disposed between the rotor and the piston rod. The utility model solves the problems that the sealing failure of the V-shaped sealing ring and the leakage of hydraulic oil can occur when the piston rod in the hydraulic cylinder in the prior art adopts the V-shaped sealing ring for sealing and the piston rod obliquely extends and the extending length is longer.
Description
Technical Field
The utility model relates to the technical field of hydraulic sealing, in particular to a piston rod sealing structure, a hydraulic cylinder and a hydraulic hoist.
Background
The flood discharge gate is a gate provided in a flood control structure such as an overflow dam, and the flow rate, water level, etc. in the vicinity can be adjusted by opening/closing the flood discharge gate to prevent the occurrence of flood. Because the flood discharge gate has a large volume and requires a large operating force when being opened or closed, a special mechanism is generally arranged to control the action of the flood discharge gate. The common mechanism is a hydraulic hoist, the hydraulic hoist controls a hydraulic cylinder through a hydraulic system, the hydraulic cylinder is driven to act through hydraulic pressure, and then the hydraulic cylinder is used for opening/closing a flood discharge gate.
When a piston rod of a hydraulic cylinder in the existing hydraulic hoist is sealed, a V-shaped sealing ring is generally adopted for dynamic sealing. Because the flood discharge gate is in an inclined state when in a closed state, the piston rod is inclined and extends, and the piston rod is large in size and heavy. The piston rod is in an inclined extending state for a long time, when the extending length is long, the phenomenon that the axis of the piston rod is not coincident with the axis of the cylinder barrel of the hydraulic cylinder can occur under the influence of the gravity of the piston rod, and the compression of the V-shaped sealing ring is uneven, so that the dynamic sealing failure and the hydraulic oil leakage can occur.
Disclosure of Invention
Therefore, the utility model aims to overcome the defects that when a piston rod in a hydraulic cylinder in the prior art is sealed by a V-shaped sealing ring and the extending length of the piston rod is longer, the sealing failure of the V-shaped sealing ring and the leakage of hydraulic oil occur, and further provides a piston rod sealing structure, a hydraulic cylinder and a hydraulic hoist which have good sealing effect and can not leak even if the axis of the piston rod is deviated.
In order to solve the above problems, the present utility model provides a piston rod sealing structure comprising:
an end cap having a hollow structure;
a piston rod passing through the end cap;
the rotating piece is arranged between the end cover and the piston rod, the outer wall of the rotating piece is in rotary contact with the inner wall of the end cover, the inner wall of the rotating piece is in sliding contact with the outer wall of the piston rod, and the piston rod is suitable for driving the rotating piece to rotate under the driving of gravity of the piston rod;
the seal assembly comprises a first seal member arranged between the rotating member and the piston rod.
Optionally, the inner wall of end cover has seted up the sphere groove, the outer wall of rotating the piece is the sphere, the outer wall of rotating the piece with the sphere groove rotates the contact.
Optionally, a mounting groove is formed at one end of the rotating member, and the first sealing member is disposed in the mounting groove.
Optionally, the device further comprises a gland, wherein the gland is fixedly connected with one end of the end cover.
Optionally, one end of the gland is inserted into the hollow structure and abuts one end of the first seal.
Optionally, one end of the gland inserted into the hollow structure is in a step shape, and a contact part of the gland and the first sealing element is in an arc shape.
Optionally, the first sealing member is a V-shaped sealing ring.
Optionally, the seal assembly further includes a second seal member and a third seal member, the second seal member is disposed between the rotating member and the end cap, and the third seal member is disposed between the gland and the end cap.
The hydraulic cylinder comprises the piston rod sealing structure and a cylinder barrel, wherein one end of the end cover, which is far away from the gland, is fixedly connected with the cylinder barrel, and the cylinder barrel and the end cover are coaxially arranged.
A hydraulic hoist comprises the hydraulic cylinder.
The utility model has the following advantages:
1. according to the piston rod sealing structure provided by the utility model, the piston rod is arranged in the hollow structure of the end cover, the rotating piece is arranged between the end cover and the piston rod, the outer wall of the rotating piece is in rotary contact with the inner wall of the end cover, and the first sealing piece is arranged between the rotating piece and the piston. When the piston rod obliquely extends out, the axis of the piston rod deviates from the axis of the end cover under the action of gravity, and the rotating part is driven to rotate at the moment, so that the first sealing part is ensured to be stressed uniformly, and the first sealing part can be sealed normally and cannot fail.
2. According to the piston rod sealing structure provided by the utility model, the second sealing element is arranged between the rotating element and the end cover, the third sealing element is arranged between the gland and the end cover, and oil leakage is prevented from the joint of the rotating element and the end cover and the joint of the gland and the end cover by arranging the second sealing element and the third sealing element, so that the sealing effect is good.
3. The hydraulic cylinder provided by the utility model adopts the piston rod sealing structure, and the piston rod sealing structure is fixed by connecting one end of the end cover, which is far away from the gland, with the cylinder barrel. The piston cylinder of the hydraulic cylinder extends obliquely and is kept in an inclined state for a long time, so that the sealing performance can be ensured, and leakage can not occur.
4. According to the hydraulic hoist provided by the utility model, the hydraulic hoist is used for controlling the flood discharge gate, and even if the extension length of the piston rod is long and the piston rod is kept in an inclined state for a long time, the dynamic seal cannot fail and cannot leak. The sealing effect is good, the service life is long, and the sealing device is not easy to damage.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a piston rod sealing structure of the present utility model;
fig. 2 is an enlarged view of part of a of fig. 1 according to the present utility model.
Reference numerals illustrate:
1. an end cap; 2. a piston rod; 3. a rotating member; 401. a first seal, 402, a second seal, 403, a third seal; 5. and (5) pressing cover.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1 and 2, the piston rod sealing structure is a preferred embodiment of the piston rod sealing structure of the present utility model, and the piston rod sealing structure can be applied to a hydraulic cylinder, particularly a hydraulic cylinder in which the piston rod 2 is in an inclined state for a long time and has a large self weight. The piston rod sealing structure can automatically compensate deviation when the axis of the piston rod 2 deviates, and the sealing element is sealed reliably.
The piston rod sealing structure comprises: an end cap 1, a piston rod 2, a rotor 3 and a sealing assembly. The end cap 1 has a hollow structure for providing the piston rod 2. The inner wall of the end cover 1 is provided with a spherical groove for being matched and connected with the rotating piece 3.
The piston rod 2 is arranged in the hollow structure of the end cover 1, and the piston rod 2 and the end cover 1 are coaxially arranged. The length of the piston rod 2 is longer than that of the end cap 1, and the piston rod 2 is retractable in the axial direction thereof.
The rotating member 3 is arranged between the end cover 1 and the piston rod 2, the outer wall of the rotating member 3 is in rotary contact with the inner wall of the end cover 1, the inner wall of the rotating member 3 is in sliding contact with the outer wall of the piston rod 2, and the piston rod 2 is suitable for driving the rotating member 3 to rotate under the driving of gravity. Specifically, the outer wall of the rotating member 3 is a spherical surface, and the outer wall of the rotating member 3 is in rotary contact with the spherical surface groove. In addition, an installation groove is provided at one end of the rotating member 3. The mounting groove is formed in the end portion of the rotating member 3, and one end of the mounting groove is opened.
Further, the seal assembly comprises a first seal 401, the first seal 401 being arranged between the rotor 3 and the piston rod 2. Specifically, the first seal member 401 is disposed in a mounting groove on the rotating member 3, and the first seal member 401 is preferably a V-shaped seal ring.
When the piston rod 2 is tilted out of the cavity of the end cap 1, the axis of the piston rod 2 will be slightly offset due to the heavy weight of the piston rod 2, i.e. the axis of the piston rod 2 is no longer parallel to the axis of the end cap 1, due to the influence of gravity. At this time, the outer wall of the spherical surface of the rotating member 3 slides in the spherical groove of the end cover 1, so that the first sealing member 401 is always compressed uniformly, and the sealing effect is ensured.
The piston rod sealing structure also comprises a gland 5, and the gland 5 is fixedly connected with one end of the end cover 1. One end of the gland 5 is inserted into the hollow structure of the end cap 1 and abuts against one end of the first seal member 401 to restrict displacement of the first seal member 401. In addition, the end of the gland 5 inserted into the hollow structure is in a step shape, and the contact part of the gland and the first sealing member 401 is in an arc shape, so that the rotation member 3 and the first sealing member 401 can rotate synchronously.
Further, the seal assembly further comprises a second seal 402 and a third seal 403, the second seal 402 being arranged between the rotor 3 and the end cap 1, the third seal 403 being arranged between the gland 5 and the end cap 1. Specifically, in this embodiment, the second seal 402 and the third seal 403 are preferably O-rings. By providing the second seal 402 and the third seal 403, the tightness of the piston rod sealing structure as a whole is improved, and oil leakage from the joints between the components is prevented.
The embodiment also provides a hydraulic cylinder, including foretell piston rod seal structure and cylinder, the one end and the cylinder fixed connection of gland 5 are kept away from to end cover 1, and cylinder and end cover 1 coaxial line set up. One end of the piston rod 2 is arranged in the cylinder barrel, and the other end extends out from one end of the end cover 1 away from the cylinder barrel.
The embodiment also provides a hydraulic hoist, which comprises the hydraulic cylinder, a hydraulic pump, a control valve, a hydraulic pipeline and the like. The hydraulic pump, the control valve and the hydraulic cylinder are connected through a hydraulic pipeline, pressure oil is supplied to the control valve through the hydraulic cylinder and then to the hydraulic cylinder, and the piston rod is controlled to act through the control valve. The output end of the piston rod is connected with the flood discharge gate to control the opening/closing of the flood discharge gate.
The working process of the hydraulic hoist provided in this embodiment is described below:
when the flood discharge gate needs to be closed, oil is pumped by the hydraulic pump and is conveyed to the control valve, then reaches the hydraulic cylinder from the control valve, and the piston rod 2 is pushed to extend by the hydraulic oil. When the piston rod 2 reaches a specified stroke, the piston rod 2 is kept in the current length and angle state by the control valve. When the piston rod 2 is in an inclined state for a long time, the axis of the piston rod 2 is offset and is no longer parallel to the axis of the cylinder barrel under the action of gravity. At this time, the outer wall of the rotating member 3 rotates in the spherical groove, so the first sealing member 401 also rotates along with the rotation, and the lower half part of the first sealing member 401 is not stressed too much under the action of gravity, so that the compression of the upper half part and the lower half part is uneven, and a gap is formed at the joint of the upper half part and the lower half part and the piston rod 2, so that the oil leakage phenomenon occurs.
When the flood discharge gate needs to be opened, the hydraulic cylinder is controlled by the control valve, so that the piston rod 2 moves reversely (i.e. retracts towards the cylinder barrel direction) until the flood discharge gate is completely opened.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (10)
1. A piston rod sealing structure, comprising:
an end cover (1), the end cover (1) having a hollow structure;
a piston rod (2), the piston rod (2) passing through the end cap (1);
the rotating piece (3) is arranged between the end cover (1) and the piston rod (2), the outer wall of the rotating piece (3) is in rotating contact with the inner wall of the end cover (1), the inner wall of the rotating piece (3) is in sliding contact with the outer wall of the piston rod (2), and the piston rod (2) is suitable for driving the rotating piece (3) to rotate under the driving of gravity;
the sealing assembly comprises a first sealing element (401), and the first sealing element (401) is arranged between the rotating element (3) and the piston rod (2).
2. The piston rod sealing structure according to claim 1, wherein a spherical groove is formed in the inner wall of the end cover (1), the outer wall of the rotating member (3) is spherical, and the outer wall of the rotating member (3) is in rotational contact with the spherical groove.
3. The piston rod sealing structure according to claim 1, wherein a mounting groove is provided at one end of the rotating member (3), and the first sealing member (401) is provided in the mounting groove.
4. The piston rod sealing structure according to claim 1, further comprising a gland (5), wherein the gland (5) is fixedly connected with one end of the end cap (1).
5. A piston rod sealing arrangement according to claim 4, characterized in that one end of the gland (5) is inserted into the hollow structure and abuts one end of the first seal (401).
6. The piston rod sealing structure according to claim 5, wherein one end of the gland (5) inserted into the hollow structure is stepped and a contact portion with the first sealing member (401) is arc-shaped.
7. The piston rod sealing arrangement according to claim 1, wherein the first seal (401) is a V-shaped sealing ring.
8. The piston rod sealing structure according to claim 4, wherein the sealing assembly further comprises a second sealing member (402) and a third sealing member (403), the second sealing member (402) being arranged between the rotating member (3) and the end cap (1), the third sealing member (403) being arranged between the gland (5) and the end cap (1).
9. A hydraulic cylinder, characterized by comprising the piston rod sealing structure according to any one of claims 4-6, and further comprising a cylinder barrel, wherein one end of the end cover (1) far away from the gland (5) is fixedly connected with the cylinder barrel, and the cylinder barrel and the end cover (1) are coaxially arranged.
10. A hydraulic hoist comprising the hydraulic cylinder of claim 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320373505.7U CN219388295U (en) | 2023-02-28 | 2023-02-28 | Piston rod sealing structure, hydraulic cylinder and hydraulic hoist |
| JP2023001063U JP3242215U (en) | 2023-02-28 | 2023-03-31 | Piston rod seal structure, hydraulic cylinder and hydraulic hoist |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320373505.7U CN219388295U (en) | 2023-02-28 | 2023-02-28 | Piston rod sealing structure, hydraulic cylinder and hydraulic hoist |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219388295U true CN219388295U (en) | 2023-07-21 |
Family
ID=86537461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320373505.7U Active CN219388295U (en) | 2023-02-28 | 2023-02-28 | Piston rod sealing structure, hydraulic cylinder and hydraulic hoist |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3242215U (en) |
| CN (1) | CN219388295U (en) |
-
2023
- 2023-02-28 CN CN202320373505.7U patent/CN219388295U/en active Active
- 2023-03-31 JP JP2023001063U patent/JP3242215U/en active Active
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| Publication number | Publication date |
|---|---|
| JP3242215U (en) | 2023-06-02 |
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