CN221299931U

CN221299931U - Shock absorber with floating piston

Info

Publication number: CN221299931U
Application number: CN202323391428.7U
Authority: CN
Inventors: 郑桂梅; 王惜鑫; 王世鸣
Original assignee: Bohai Trial Repair Tianjin Petroleum Engineering Technology Service Co ltd
Current assignee: Bohai Trial Repair Tianjin Petroleum Engineering Technology Service Co ltd
Filing date: 2023-12-13
Publication date: 2024-07-09
Anticipated expiration: 2033-12-13

Abstract

The utility model relates to the technical field of petroleum exploitation equipment, in particular to a shock absorber with a floating piston, which comprises a working cylinder and a piston rod, wherein the end part of the piston rod extends into the working cylinder; the top of the working cylinder is fixedly connected with an end cover, and one side of the end cover is connected with a check valve; the bottom of the piston rod is provided with a piston, the piston and the piston rod are fixedly connected with each other, and a floating piston is arranged below the piston; the lower extreme of floating piston is provided with the spring, and the one end and the mutual fixed connection of floating piston of spring, the other end and the bottom of working cylinder of spring are fixed connection each other. According to the utility model, by introducing the floating piston, the hydraulic balance between oil and gas can be effectively maintained, so that the damping characteristic of the shock absorber is kept stable, the shock absorbing effect change caused by unbalanced oil and gas pressure is avoided, the lateral pressure of the piston to the cylinder wall is reduced, more uniform hydraulic pressure distribution is formed, and the shock absorbing effect is improved.

Description

Shock absorber with floating piston

Technical Field

The utility model relates to the technical field of petroleum exploitation equipment, in particular to a shock absorber with a floating piston.

Background

Currently, in petroleum drilling, a drilling tool is driven to break rock, drill into the ground, and drill a borehole of a prescribed depth, and oil or gas is obtained by an oil or gas production machine. A general petroleum drilling machine mainly comprises a power machine, a transmission machine, a working machine and auxiliary equipment, wherein a damping device is arranged between a drilling tool body and the power output equipment, so that the action stress is reduced conveniently when the drilling tool interacts with a rock layer with larger hardness, the purpose of protecting the drilling tool is achieved, an internal floating piston is generally adopted during the operation of the conventional shock absorber, and the main technical characteristics are that: the engine oil is injected into the gap between the piston and the cylinder wall, and the hydraulic pressure difference is generated by the gap between the piston and the cylinder wall at two sides of the piston to resist the lateral force born by the piston and float the piston, so that the abrasion is greatly reduced, and the efficiency is improved. The piston is subjected to inertial forces and pressures during operation, creating side pressure to the cylinder wall. By injecting oil pressure into the gap between the piston and the cylinder wall, a pressure oil film is formed, and liquid friction is generated. For this purpose, there are several small oil holes on the cylinder wall, there are oil groove nets on the bearing surface of the piston both sides, and keep communicating with at least one small oil hole on the cylinder wall; according to the running condition of the piston, engine oil is pressed into a gap between the piston and a cylinder wall through the small oil holes in sequence, the engine oil fills the gap under the guidance of an oil groove net on the piston, an oil film is formed, when the lateral pressure of the piston on the cylinder wall is increased to enable the gap to be reduced, the oil resistance of the oil film is increased, the oil pressure is increased, the pressure of the piston is resisted, and the formation of liquid friction is ensured, so that the aims of reducing abrasion and improving efficiency are achieved.

However, the hydraulic balance between the oil and the gas in the shock absorber in the prior art is critical, and if the pressure of the oil and the gas is unbalanced, the damping characteristic of the shock absorber may be changed, thereby affecting the shock absorbing effect.

There is therefore a need for a shock absorber with a floating piston that solves the above-mentioned problems.

Disclosure of utility model

The utility model aims to provide a shock absorber with a floating piston, which can effectively maintain hydraulic balance between oil and gas by introducing the floating piston, so that the damping characteristic of the shock absorber is kept stable, the shock absorbing effect change caused by unbalanced oil and gas pressure is avoided, the side pressure of the piston to a cylinder wall is reduced, more uniform hydraulic pressure distribution is formed, and the shock absorbing effect is improved.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a shock absorber with a floating piston, comprising a working cylinder and a piston rod, wherein the end part of the piston rod extends into the working cylinder;

An end cover is fixedly connected to the top of the working cylinder, and a check valve is connected to one side of the end cover;

The bottom of the piston rod is provided with a piston, the piston and the piston rod are fixedly connected with each other, and a floating piston is arranged below the piston;

The floating piston comprises a cylinder body, a breathable film and a supporting plate, wherein the breathable film is adhered to the upper end of the cylinder body, the supporting plate is fixedly connected to the bottom of the cylinder body, and a plurality of through holes B are formed in the supporting plate;

The lower extreme of floating piston is provided with the spring, and the one end and the floating piston of spring are fixed connection each other, the other end of spring with the bottom of working cylinder is fixed connection each other.

Further, the piston comprises a piston disc, a gasket A and a gasket B, wherein the gasket A is fixedly connected to the top of the piston disc, the gasket B is fixedly connected to the bottom of the piston disc, and through holes A are formed in the gasket A, the piston disc and the gasket B.

Further, the piston and the piston rod are fixedly connected with each other through a connecting rod, one end of the connecting rod is fixedly connected with the piston rod, and the other end of the connecting rod penetrates through the piston and is mutually fixed with the piston through a fastening piece.

Further, the top fixedly connected with rings on the piston rod, the bottom fixedly connected with rings down of working cylinder.

The utility model has the advantages that: the utility model provides a shock absorber with a floating piston, which has the following technical effects:

1. According to the utility model, the hydraulic balance between oil and gas can be effectively maintained by introducing the floating piston, so that the damping characteristic of the shock absorber is kept stable; the support plate is fixedly connected to the bottom of the floating piston, and has the function of supporting and fixing the bottom of the floating piston, and a plurality of through holes B are formed in the support plate. The through holes B can be used for adjusting pressure balance between gas and liquid, influence damping characteristics of the shock absorber, avoid shock absorption effect change caused by unbalanced oil and gas pressure, and are beneficial to reducing side pressure of the piston to the cylinder wall, forming more uniform hydraulic pressure distribution and improving shock absorption effect.

2. According to the utility model, by improving the piston structure and the connecting mode, the drilling tool can be better protected, the action stress when the drilling tool interacts with the rock layer with high hardness is reduced, the service life of equipment is prolonged, the working environment of petroleum drilling operation is improved, the equipment loss is reduced, and the production efficiency is improved.

The utility model is helpful for solving the problems of hydraulic balance, damping effect stability and the like in the prior art, thereby providing more reliable and efficient support for petroleum drilling operation.

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 perspective view of the present utility model;

FIG. 2 is a schematic cross-sectional view of the present utility model;

FIG. 3 is a schematic cross-sectional view of a piston according to the present utility model;

FIG. 4 is a schematic view of an exploded construction of a floating piston according to the present utility model;

FIG. 5 is a schematic view of the structure of the present utility model in a compressed state;

Wherein:

1. a working cylinder; 2. A piston rod; 3. An upper hanging ring;

4. An end cap; 5. A check valve; 6. A piston;

601. A piston disc; 602. A gasket A; 603. A gasket B;

604. A fastening tab; 605. A through hole A; 606. A connecting rod;

7. a floating piston; 701. A breathable film; 702. A support plate;

703. a through hole B; 704. A cylinder; 8. A spring;

9. And a lower hanging ring.

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 unless explicitly stated and limited otherwise, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in 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," "third," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying any particular importance, but rather the terms "mounted," "connected," or the like are to be construed broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; 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 will be understood in specific cases by those of ordinary skill in the art.

Example 1:

Fig. 1 is a schematic perspective view of a structure of the present utility model, fig. 2 is a schematic cross-sectional view of the structure of the present utility model, fig. 3 is a schematic cross-sectional view of a piston of the present utility model, fig. 4 is a schematic explosion structure of a floating piston of the present utility model, fig. 5 is a schematic view of a structure of the present utility model in a compressed state, and a shock absorber with a floating piston shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5 includes a working cylinder 1 and a piston rod 2, wherein an end portion of the piston rod 2 extends into the working cylinder 1, pressure and force can be transmitted through movement of the piston rod 2, an upper suspension ring 3 is fixedly connected to a top portion of the piston rod 2, and a lower suspension ring 9 is fixedly connected to a bottom portion of the working cylinder 1 for installing and fixing a position of the shock absorber on a device;

The utility model is fixedly connected with the end cover 4 at the top of the working cylinder 1, the end cover 4 provides the sealing and supporting functions of the shock absorber, the liquid is ensured not to leak, one side of the end cover 4 is connected with the check valve 5, the check valve 5 is a valve connected with the end cover 4, and the function of the check valve is to control the flowing direction of the liquid in the piston rod 2. When an external impact force acts on the shock absorber, the check valve 5 can prevent liquid from flowing backwards, so that the shock absorber can work normally when suffering impact;

The piston 6 is arranged at the bottom of the piston rod 2, the piston 6 and the piston rod 2 are fixedly connected with each other through the connecting rod 606, one end of the connecting rod 606 is fixedly connected with the piston rod 2, the other end of the connecting rod 606 penetrates through the piston 6 and is mutually fixed with the piston 6 through the fastening piece 604, the piston 6 is used for receiving the pressure of liquid and is transmitted to the shock absorber through the piston rod 2, the floating piston 7 is arranged below the piston 6, the pressure of the liquid and the working state of the shock absorber are balanced through floating, meanwhile, the bottom of the floating piston 7 is provided with the spring 8, one end of the spring 8 is fixedly connected with the floating piston 7, and the other end of the spring 8 is fixedly connected with the bottom of the working cylinder 1 so as to absorb and relieve external impact force;

The piston 6 in the utility model comprises a piston disc 601, a gasket A602 and a gasket B603, wherein the gasket A602 is fixedly connected to the top of the piston disc 601, the gasket B603 is fixedly connected to the bottom of the piston disc 601, through holes A605 are formed in the gasket A602, the piston disc 601 and the gasket B603, the through holes A605 can change the pressure distribution of liquid in the floating piston 7 so as to influence the damping characteristic of the shock absorber, the floating piston 7 in the utility model comprises a cylinder 704, a gas permeable membrane 701 and a supporting plate 702, the cylinder 704 is a main structure of the floating piston 7 and plays a role of accommodating and supporting other parts, the overall shape and structural stability of the floating piston 7 are also provided, and the gas permeable membrane 701 is bonded to the upper end of the cylinder 704 and plays a role of realizing separation between gas (usually gas pressure) and liquid (such as engine oil) so as to form gas pressure balance. The air-permeable membrane 701 is made of special materials and structures, allows gas to pass through, but prevents liquid from penetrating, so that the balance of air pressure inside and outside the floating piston 7 is maintained, the supporting plate 702 is fixedly connected to the bottom of the cylinder 704, and a plurality of through holes B703 are formed in the supporting plate 702, and the through holes B703 can be used for adjusting the pressure balance between the gas and the liquid, so that the damping characteristic of the shock absorber is affected.

Working principle: when the shock absorber is in a stationary state, liquid is filled in the working cylinder 1, the piston rod 2 extends into the working cylinder 1, and when an external impact force acts on the shock absorber, the piston rod 2 is subjected to transmission of pressure and force. Pressure transmission: the utility model is provided with a spring 8 at the bottom of the floating piston 7, the spring 8 can absorb and relieve external impact force and provide additional buffering effect, the top of the piston rod 2 is fixedly connected with an upper hanging ring 3, the bottom of the working cylinder 1 is fixedly connected with a lower hanging ring 9, and the shock absorber is used for mounting and fixing. Meanwhile, a check valve 5 is connected to one side of the end cap 4. The check valve 5 is used as a valve to control the flow direction of the liquid in the piston rod 2, and when an external impact force acts on the shock absorber, the check valve 5 can prevent the liquid from flowing backwards, so that the shock absorber can work normally when being impacted.

In summary, the shock absorber with the floating piston 7 transmits pressure and force through the movement of the piston rod 2, absorbs and relieves external impact force through the spring 8, the check valve 5 controls the flow direction of liquid, and the floating piston 7 balances the pressure of the liquid, so that the damping characteristic of the shock absorber is kept stable, and a good shock absorbing effect is achieved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. A shock absorber with a floating piston, comprising a working cylinder (1) and a piston rod (2), the end of the piston rod (2) extending into the interior of the working cylinder (1);

the hydraulic cylinder is characterized in that the top of the working cylinder (1) is fixedly connected with an end cover (4), and one side of the end cover (4) is connected with a check valve (5);

The bottom of the piston rod (2) is provided with a piston (6), the piston (6) is fixedly connected with the piston rod (2), and a floating piston (7) is arranged below the piston (6);

The floating piston (7) comprises a cylinder (704), a ventilation membrane (701) and a support plate (702), wherein the ventilation membrane (701) is adhered to the upper end of the cylinder (704), the support plate (702) is fixedly connected to the bottom of the cylinder (704), and a plurality of through holes B (703) are formed in the support plate (702);

The lower extreme of floating piston (7) is provided with spring (8), and the one end and the mutual fixed connection of floating piston (7) of spring (8), the other end and the bottom of working cylinder (1) of spring (8) are fixed connection each other.

2. The shock absorber with the floating piston according to claim 1, wherein the piston (6) comprises a piston disc (601), a gasket a (602) and a gasket B (603), the gasket a (602) is fixedly connected to the top of the piston disc (601), the gasket B (603) is fixedly connected to the bottom of the piston disc (601), and through holes a (605) are formed in the gasket a (602), the piston disc (601) and the gasket B (603).

3. A shock absorber with a floating piston according to claim 1, characterized in that the piston (6) and the piston rod (2) are fixedly connected to each other by means of a connecting rod (606), one end of the connecting rod (606) is fixedly connected to the piston rod (2) to each other, and the other end of the connecting rod (606) penetrates the piston (6) and is mutually fixed to the piston (6) by means of a fastening piece (604).

4. A shock absorber with a floating piston according to claim 1, characterized in that the top of the piston rod (2) is fixedly connected with an upper suspension ring (3), and the bottom of the working cylinder (1) is fixedly connected with a lower suspension ring (9).