CN217080973U - Bidirectional hydraulic driving mechanism suitable for underground environment - Google Patents

Abstract

The utility model provides a two-way hydraulic drive mechanism suitable for environment in pit, include: the piston type piston pump comprises a cylinder body, piston rods, an upper mandrel, a lower mandrel, a sealing cover and a one-way plunger pump, wherein the upper mandrel and the lower mandrel are positioned between the two piston rods and are respectively connected with one piston rod; the inner sides of the two pistons and the cylinder body form a constant volume oil cavity, the outer sides of the two pistons and the cylinder body and the corresponding sealing covers form variable volume oil cavities, oil ducts are arranged between the constant volume oil cavity and the two variable volume oil cavities respectively, and two-position two-way electromagnetic valves and one-way plunger pumps are arranged on the oil ducts. The utility model discloses an integrate the oil pump inside the hydro-cylinder, realize the two-way controllable of hydro-cylinder, simplify whole actuating mechanism's mounting structure simultaneously, have the installation swift, maintain convenient characteristics, be applicable to oil gas well borehole operation and measure, can effectively improve production efficiency.

Description

Bidirectional hydraulic driving mechanism suitable for underground environment

Technical Field

The utility model relates to a mechanical equipment especially relates to oil gas well mechanical equipment, specifically is a two-way hydraulic drive mechanism suitable for environment in the pit.

Background

In downhole measurements of oil and gas wells, some downhole tools and testing mechanisms need to be able to be moved and repositioned. Because some testing mechanisms and downhole tools are generally low in mass and cannot be reset by means of gravity, the driving of the testing mechanisms and the downhole tools must be bidirectional, and therefore, the driving mechanism of the existing downhole tools generally adopts a bidirectional controllable hydraulic cylinder with an oil pump and an oil cylinder separated from each other. And the oil gas well's environment is complicated and be full of the fluid in the pit, and oil pump and cylinder body need two at least installation positions usually, and its installation is very inconvenient with the dismantlement, and in addition, at actuating mechanism well and the in-process that returns ground, the oil circuit between oil pump and the hydro-cylinder is connected and also often damaged and breaks down, not only influences production efficiency, has still increased the maintenance process.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the background art, the utility model aims at providing a two-way hydraulic drive mechanism suitable for environment in pit, it is through integrating the oil pump inside the hydro-cylinder, realizes the two-way controllable of hydro-cylinder, simplifies whole actuating mechanism's mounting structure simultaneously, has the installation swift, maintains convenient characteristics, can effectively improve production efficiency.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a bi-directional hydraulic drive mechanism adapted for use in a downhole environment, comprising: the piston rods are coaxial with the cylinder body, and each piston rod correspondingly penetrates through the sealing cover at the same end and is in sliding fit with the sealing cover;

the upper mandrel and the lower mandrel are positioned between the two piston rods and are respectively connected with one piston rod, and the upper mandrel and the lower mandrel are not coaxial with the cylinder body; the upper core shaft and the lower core shaft are connected through nuts, pistons which are connected with the cylinder body in a sliding mode are fixedly arranged on the upper core shaft and the lower core shaft, the two pistons form a plunger pump seat, the two sides of the plunger pump seat respectively form oil cavities with the corresponding sealing covers and the cylinder body, two oil ducts are arranged inside the plunger pump seat through pipelines, two oil cavities are communicated with two ends of each oil duct, a two-position two-way electromagnetic valve and a one-way plunger pump are arranged on the oil ducts, the conveying directions of the two-position two-way electromagnetic valves are opposite, the two-position two-way electromagnetic valves are used for controlling the on-off of the oil ducts, and the one-way plunger pump is used for driving oil to flow.

The one-way plunger pump is fixedly arranged on the end face of the outer side of the piston and located in the oil cavity, a driving motor of the one-way plunger pump is a speed reducing motor, the speed reducing motor located on one side of the upper mandrel is fixedly arranged on the upper mandrel, and the speed reducing motor located on one side of the lower mandrel is fixedly arranged on the lower mandrel.

The upper mandrel and the lower mandrel are respectively connected with corresponding piston rods through transition joints, and connecting nuts are respectively arranged at two ends of each transition joint; the piston rod, the upper mandrel, the lower mandrel and the transition joint are communicated with each other.

One end of the sealing cover is in threaded connection and sealing with the cylinder body, the other end of the sealing cover is in threaded connection with a flange, and the flange is used for connecting an external driven structure; and external threads are respectively arranged at two ends of the piston rod and are used for fixedly connecting an external mounting structure.

The sealing cover is internally provided with an oil supplementing channel, one end of the oil supplementing channel is communicated with the oil cavity, and the other end of the oil supplementing channel is provided with a sealing plug screw.

The sealing structure is characterized in that a sealing end cover is arranged between the sealing cover and the piston rod, the sealing end cover is sleeved on the piston rod and is in threaded connection with the sealing cover, a combined sealing element is arranged between the sealing end cover and the sealing cover, the combined sealing element comprises a spacer ring and a sealing ring, the spacer ring is sleeved on the piston rod, and the two ends of the spacer ring are respectively provided with the sealing ring.

The utility model has the advantages that: the utility model discloses an integrate the oil pump inside the hydro-cylinder, realize the two-way controllable of hydro-cylinder, simplify whole actuating mechanism's mounting structure simultaneously, have the installation swift, maintain convenient characteristics, be applicable to oil gas well borehole operation and measure, can effectively improve production efficiency.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of a partial structure of the present invention.

In the figure: 1. the oil-filling type piston pump comprises a cylinder body, 2, a piston rod, 3, an upper mandrel, 4, a lower mandrel, 5, a sealing cover, 6, a one-way plunger pump, 7, a nut, 8, a piston, 9, a plunger pump seat, 10, an oil cavity, 11, an oil passage, 12, a two-position two-way electromagnetic valve, 13, a driving motor, 14, a transition joint, 15, a flange, 16, an oil supplementing passage, 17, a sealing plug, 18, a sealing end cover, 19, a spacer ring, 20, a sealing ring, 21 and a connecting nut.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, a bidirectional hydraulic driving mechanism suitable for a downhole environment comprises: the piston type plunger pump comprises a cylinder body 1,piston rods 2, anupper mandrel 3, a lower mandrel 4, sealing covers 5 and a one-way plunger pump 6, wherein the sealing covers 5 and thepiston rods 2 are arranged at two ends of the cylinder body 1, thepiston rods 2 are coaxial with the cylinder body 1, and eachpiston rod 2 correspondingly penetrates through thesealing cover 5 at the same end and is in sliding fit with thesealing cover 5; specifically, the connection and sealing between thesealing cover 5 and the cylinder body 1 belong to the known technology, in one embodiment of the present invention, thesealing cover 5 is provided with external threads and is in threaded connection with the cylinder body 1, and the part outside the threaded connection is sealed by a sealing ring;

theupper mandrel 3 and the lower mandrel 4 are positioned between the twopiston rods 2 and are respectively connected with onepiston rod 2, and theupper mandrel 3 and the lower mandrel 4 are not coaxial with the cylinder body 1 because the mounting position of the one-way plunger pump 6 needs to be set aside; theupper mandrel 3 and the lower mandrel 4 are connected through anut 7,pistons 8 which are connected with a cylinder body 1 in a sliding mode are fixedly arranged on theupper mandrel 3 and the lower mandrel 4, the twopistons 8 form a plunger pump seat 9, two sides of the plunger pump seat 9 respectively formoil cavities 10 with acorresponding sealing cover 5 and the cylinder body 1, twooil ducts 11 are arranged inside the plunger pump seat 9 through pipelines, two ends of eachoil duct 11 are communicated with the twooil cavities 10, two-position two-wayelectromagnetic valves 12 and one-way plunger pumps 6 are arranged on theoil ducts 11, the conveying directions of the two one-way plunger pumps 6 are opposite, the two-position two-wayelectromagnetic valves 12 are used for controlling the on-off of theoil ducts 11, and the one-way plunger pumps 6 are used for driving oil to flow.

The utility model discloses a principle is that the piston rod end is fixed and the cylinder body removes, by cylinder body drive object motion, in the cylinder body, has set up two one-way plunger pump 6 that direction of delivery is opposite and has joined in marriage oil the utility model discloses an in the embodiment, left one-way plunger pump 6 control rightside oil pocket 10 increases, and the one-way plunger pump 6 control leftside oil pocket 10 on right side increases.

Specifically, taking the volume of theleft oil chamber 10 as an example, the left one-way plunger pump 6 and the right two-position two-wayelectromagnetic valve 12 are firstly closed, then the right one-way plunger pump 6 and the left two-position two-wayelectromagnetic valve 12 are opened, at this time, the right one-way plunger pump 6 injects oil into theleft oil chamber 10 from theright oil chamber 10, and when the volume of theleft oil chamber 10 is increased, the cylinder body moves to the right; on the contrary, if the volume of the left oil chamber is to be restored to the initial state, or the volume of theright oil chamber 10 is to be increased, the right one-way plunger pump 6 and the left two-position two-way solenoid valve 12 are closed, and then the left one-way plunger pump 6 and the right two-position two-way solenoid valve 12 are opened, at this time, the cylinder body will move to the left side until the maximum stroke is reached.

In the above principle, how the one-way plunger pump 6 drives the oil to move in one direction in theoil passage 11 is a known technology, and the oil passage for pumping the oil in one oil chamber into one oil chamber by using the one-way plunger pump 6 and the two-position two-way solenoid valve 12 is also a known technology, so that the patent does not fully illustrate the oil passage, and theoil passage 11 in fig. 1 and 2 only shows a part of the oil passage. Specifically, taking the oil path for driving the right oil chamber to increase as an example, the following is briefly described:

the two ends of anoil path 11 are respectively communicated with aleft oil chamber 10 and aright oil chamber 10, a left one-way plunger pump 6 is arranged at the left end of theoil path 11, oil is pumped into theoil path 11 from the left oil chamber after the oil path is opened, an input port of a right two-position two-wayelectromagnetic valve 12 is connected to the right end of theoil path 11, an output port of the right two-position two-way electromagnetic valve is connected with theright oil chamber 10, and the oil flows into theright oil chamber 10 from theleft oil chamber 10 under the driving of the left one-way plunger pump 6 after the oil path is opened.

In the utility model, thedriving motor 13 of the one-way plunger pump 6 and the power supply line of the two-position two-wayelectromagnetic valve 12 can be led in from thesealing cover 5 through the oil cavity and thepiston 8, thepiston 8 is axially provided with line holes communicating two end surfaces of thepiston 8, watertight contact pins are arranged in the line holes, and the power supply line passes through the watertight contact pins; it can also be introduced from the piston rod through the upper spindle and the lower spindle, respectively, according to a similar principle.

In the scheme, the threads at the two ends of thenut 7 are the left-handed threads and the right-handed threads respectively, so that firm connection can be ensured during connection and the nut is not easy to loosen; in an embodiment of the utility model, a sealing ring is also arranged between thenut 7 and theupper mandrel 3, and a sealing ring is also arranged between thenut 7 and the lower mandrel 4, so as to prevent oil from entering the upper mandrel and the lower mandrel from a gap at the joint;

the one-way plunger pump 6 is fixedly arranged on the end face of the outer side of thepiston 8 and is positioned in theoil cavity 10, the drivingmotor 13 of the one-way plunger pump 6 is a speed reducing motor, the speed reducing motor positioned on one side of the upper mandrel is fixedly arranged on the upper mandrel, and the speed reducing motor positioned on one side of the lower mandrel is fixedly arranged on the lower mandrel.

Theupper mandrel 3 and the lower mandrel 4 are respectively connected with thecorresponding piston rods 2 throughtransition joints 14, and two ends of eachtransition joint 14 are respectively provided with a connectingnut 21; thepiston rod 2, theupper mandrel 3, the lower mandrel 4 and thetransition joint 14 are communicated with each other inside.

One end of the sealingcover 5 is in threaded connection and sealing with the cylinder body 1, the other end of the sealing cover is in threaded connection with aflange 15, and theflange 15 is used for connecting an external driven structure; and external threads are respectively arranged at two ends of thepiston rod 2 and are used for fixedly connecting an external mounting structure.

Anoil supplementing channel 16 is arranged in the sealingcover 5, one end of theoil supplementing channel 16 is communicated with theoil cavity 10, and asealing screw plug 17 is arranged at the other end of theoil supplementing channel 16.

The sealing structure is characterized in that a sealingend cover 18 is arranged between thesealing cover 5 and thepiston rod 2, the sealingend cover 18 is sleeved on thepiston rod 2 and is in threaded connection with thesealing cover 5, a combined sealing element is arranged between the sealingend cover 18 and thesealing cover 5, the combined sealing element comprises aspacer ring 19 and asealing ring 20, thespacer ring sleeve 19 is arranged on thepiston rod 2, and the two ends of thespacer ring 20 are respectively provided with thesealing ring 20.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

The part of the utility model not detailed is prior art.

Claims (6)

1. A bi-directional hydraulic drive mechanism adapted for use in a downhole environment, comprising: cylinder body (1), piston rod (2), go up dabber (3), dabber (4), sealed lid (5) and one-way plunger pump (6), characterized by:

the two ends of the cylinder body (1) are respectively provided with a sealing cover (5) and a piston rod (2), the piston rods (2) are coaxial with the cylinder body (1), and each piston rod (2) correspondingly penetrates through the sealing cover (5) at the same end and is in sliding fit with the sealing cover (5);

the upper mandrel (3) and the lower mandrel (4) are positioned between the two piston rods (2) and are respectively connected with one piston rod (2), and the upper mandrel (3) and the lower mandrel (4) are not coaxial with the cylinder body (1); the oil cylinder is characterized in that the upper mandrel (3) and the lower mandrel (4) are connected through a nut (7), pistons (8) which are connected with the cylinder body (1) in a sliding mode are fixedly arranged on the upper mandrel (3) and the lower mandrel (4), the two pistons (8) form a plunger pump seat (9), oil cavities (10) are formed in the two sides of the plunger pump seat (9) and the corresponding sealing cover (5) and the cylinder body (1) respectively, two oil ducts (11) are arranged inside the plunger pump seat (9) through pipelines, two oil cavities (10) are communicated with the two ends of each oil duct (11), a two-position two-way electromagnetic valve (12) and a one-way plunger pump (6) are arranged on each oil duct (11), the two-position two-way electromagnetic valve (12) is opposite in conveying direction of the two-position two-way electromagnetic valve (6), the two-position two-way electromagnetic valve (12) is used for controlling the on-off of the oil ducts (11), and the one-way plunger pump (6) is used for driving oil to flow.

2. A bi-directional hydraulic drive mechanism adapted for use in a downhole environment as claimed in claim 1, wherein: the one-way plunger pump (6) is fixedly installed on the end face of the outer side of the piston (8) and located in the oil cavity (10), a driving motor (13) of the one-way plunger pump (6) is a speed reducing motor, the speed reducing motor located on one side of the upper mandrel (3) is fixedly installed on the upper mandrel (3), and the speed reducing motor located on one side of the lower mandrel (4) is fixedly installed on the lower mandrel (4).

3. A bi-directional hydraulic drive mechanism adapted for use in a downhole environment as claimed in claim 1, wherein: the upper mandrel (3) and the lower mandrel (4) are respectively connected with the corresponding piston rods (2) through transition joints (14), and two ends of each transition joint (14) are respectively provided with a connecting nut (21); the piston rod (2), the upper mandrel (3), the lower mandrel (4) and the transition joint (14) are communicated with each other inside.

4. A bi-directional hydraulic drive mechanism adapted for use in a downhole environment as claimed in claim 1, wherein: one end of the sealing cover (5) is in threaded connection and sealing with the cylinder body (1), the other end of the sealing cover is in threaded connection with a flange (15), and the flange (15) is used for being connected with an external driven structure; and external threads are respectively arranged at two ends of the piston rod (2) and are used for fixedly connecting an external mounting structure.

5. A bi-directional hydraulic drive mechanism adapted for use in a downhole environment as claimed in claim 1, wherein: an oil supplementing channel (16) is arranged in the sealing cover (5), one end of the oil supplementing channel (16) is communicated with the oil cavity (10), and a sealing screw plug (17) is arranged at the other end of the oil supplementing channel.

6. A bi-directional hydraulic drive mechanism adapted for use in a downhole environment as claimed in claim 1, wherein: sealed lid (5) and piston rod (2) between be equipped with end cover (18), end cover (18) cover establish on piston rod (2) and with sealed lid (5) threaded connection, be equipped with the combined seal spare between end cover (18) and sealed lid (5), the combined seal spare includes spacer ring (19) and sealing washer (20), and spacer ring cover 19 is established on piston rod (2), and spacer ring 20 both ends are equipped with sealing washer (20) respectively.

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