1. The utility model provides a wear-resisting high-efficient short stopper has pole pump, includes pump barrel (1), its characterized in that: fixed valve assembly (2) are installed to pump barrel (1) lower part, pump barrel (1) inner chamber is provided with traveling valve assembly (3), traveling valve assembly (3) upper end is connected and is connect top (4), hollow plunger (11) is connected to traveling valve assembly (3) lower extreme, hollow plunger (11) upper portion and lower part are one or more roll choked flow section of wearing (5), one or more cell body (6) are seted up in the outside at hollow plunger (11) middle part, the interior loading of cell body (6) is rather than main seal (7) of matched with.

2. A wear-resistant high-efficiency short plunger rod pump as set forth in claim 1, wherein: the hollow plunger (11) outer wall of the rolling choked flow antiwear section (5) is provided with more than three grooves (8), the grooves (8) are internally provided with spindle-shaped bodies (9) which are matched with the grooves, and the spindle-shaped bodies (9) can roll in the grooves (8).

3. A wear-resistant high-efficiency short plunger rod pump as set forth in claim 2, wherein: and a supporting bulge (10) is arranged in the groove (8).

4. A wear-resistant high-efficiency short plunger rod pump as set forth in claim 2, wherein: the connecting line of two end points of the spindle-shaped body (9) is an axis, and the axes of the spindle-shaped body (9) on the same rolling flow-resisting and wear-resisting section (5) are positioned on the same cross section.

5. A wear-resistant high-efficiency short plunger rod pump as set forth in claim 1, wherein: the main sealing body (7) is an elastic sealing ring.

6. A wear-resistant high-efficiency short plunger rod pump as set forth in claim 3, wherein: the spindle-shaped body (9) is made of wear-resistant rigid material.

Background

Pumping with a rod pump is a traditional and still dominating mechanical oil production device in the petroleum industry at home and abroad. The problems of the contradiction between the leakage and the abrasion between the plunger and the pump barrel of the rod oil pump always troubles the oil extraction workers for a long time: the smaller the leakage between the plunger and the pump barrel of the oil well pump is, the larger the friction resistance is, the larger the running resistance of the plunger is, the sand jam is easy to occur, and meanwhile, the higher the energy consumption of the oil well pump is, the aggravation and acceleration of the abrasion of the oil well pump are caused; the oil well pump has the advantages of large clearance between the plunger and the pump barrel, small friction resistance, reduced eccentric wear, low sand blocking probability, large pump loss and low pump efficiency. In addition, the pump inspection operation cost of the oil well pump is high, the repair utilization rate of the conventional oil well pump is low, a large number of oil well pumps cannot be reused, and the oil well pump is high in use cost and low in efficiency.

Related personnel have many improvements to the pole oil-well pump in the aspects such as structure, maintenance, have innovated many novel oil-well pump principles, design a series of novel special oil-well pumps. Low-wear-resistance oil well pump, elastic sealing short-piston oil well pump, combined plunger anti-blocking oil well pump, mechanical self-sealing plunger pump, hollow rod oil well pump, soft sealing plunger oil well pump, clearance self-compensating plunger pump, etc. The improvement is improved in clearance compensation (reducing the leakage rate) and friction resistance between the plunger and the pump barrel (reducing the energy consumption of single stroke), but the fundamental problem of sliding friction between the plunger and the pump barrel cannot be changed. The improved scheme still adopts a sliding friction mode, particularly in complex environments with large underground stress, sand, multiple interference factors and the like, the problems of sanding, eccentric wear and the like limit the wear resistance and tearing resistance of any material, and the problems of easy abrasion of the sliding friction with high strength for a long time, which causes the gradual increase of gaps, faster reduction of pump efficiency, increased resistance and the like.

Disclosure of Invention

In order to overcome the defects of the prior art, a wear-resistant efficient short plunger rod pump is provided to solve the problems in the background technology. The lower end of a traveling valve assembly is connected with a hollow plunger, the upper part and the lower part of the hollow plunger are rolling flow-resisting and wear-resisting sections, and the friction between the plunger and a pump barrel is reduced by using a rolling friction mode; the middle part of the hollow plunger is sleeved with a main sealing body which is a main sealing part to ensure the sealing performance of the pump barrel.

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a wear-resisting high-efficient short plunger has pole pump, includes the pump barrel, the standing valve assembly is installed to the pump barrel lower part, the pump barrel inner chamber is provided with traveling valve assembly, traveling valve assembly upper end is connected the top connection, hollow plunger is connected to traveling valve assembly lower extreme, hollow plunger upper portion and lower part are one or more rolling choked flow section of wearing, one or more cell bodies are seted up in the outside at hollow plunger middle part, the loading is rather than the main seal of matched with in the cell body. The pump barrel is a main carrier and a working space of the sucker-rod pump; the fixed valve assembly is switched on and off along with the pressure of a lower liquid column, the pressure between the hollow plunger and the pump cylinder and the self weight of the valve ball, so that liquid is allowed to enter the inner cavity of the pump cylinder when the fixed valve assembly is opened, and the liquid in the inner cavity of the pump cylinder is prevented from flowing out of the pump cylinder when the fixed valve assembly is closed; the traveling valve is switched on and off along with the pressure of a liquid column on the traveling valve, the pressure between the hollow plunger and the pump cylinder and the self weight of the valve ball, liquid is allowed to enter the upper space of the pump cylinder from the pump cylinder after the traveling valve is switched on, and the upper liquid is prevented from flowing back to the pump cylinder after the traveling valve is switched off; the hollow plunger piston is matched with the pump cylinder to change the pressure in the pump cylinder, and the change of the pressure drives the movable valve assembly and the fixed valve assembly to be opened and closed, so that liquid below the pump cylinder enters the upper space of the pump cylinder.

As a further technical scheme of the invention: the hollow plunger outer wall of the rolling choked flow anti-wear section is provided with more than three grooves, spindle-shaped bodies matched with the grooves are loaded in the grooves, and the spindle-shaped bodies can roll in the grooves. The spindle body rolls, so that rolling friction is realized between the hollow plunger and the pump barrel, and the friction force between the hollow plunger and the pump barrel is reduced.

As a further technical scheme of the invention: and a supporting bulge is arranged in the groove. The supporting bulges are arranged to reduce the contact area between the spindle-shaped body and the groove and reduce the internal friction between the groove and the spindle-shaped body, so that the spindle-shaped body can easily form a rigid wear-resistant rolling flow-resisting wear-resisting section. When the hollow plunger ascends and descends, the spindle-shaped body can form a seal with the hollow plunger under the action of force. The hollow plunger has a certain thickness, and the requirements of pressure bearing and wear resistance inside the hollow plunger are met.

As a further technical scheme of the invention: the connecting line of two end points of the spindle-shaped body is an axis, and the axes of the spindle-shaped body on the same rolling flow-resisting and wear-resisting section are positioned on the same cross section. The spindle-shaped body has the following shape: the maximum outer diameter circle of the cross section of the rolling flow-resisting and wear-resisting section is divided into N sections of arcs (N is more than 3), a spindle-shaped body is formed by rotating 360 degrees by taking the connecting line of two end points of each section of arc as an axis and taking the arc as an edge, and the axes of the spindle-shaped bodies on the same rolling flow-resisting and wear-resisting section are positioned on the same cross section. Then, matching grooves are formed on the hollow plunger according to the number and specification of the spindle-shaped bodies.

As a further technical scheme of the invention: the main sealing body is an elastic sealing ring. The main seal body makes up the deficiency of the seal width of the rolling flow-resisting and wear-resisting section, is a main seal part, and the elastic seal ring has a compression amount in the radial direction, and can have wear compensation in the radial direction according to the wear degree, thereby prolonging the service life of the seal section. When the main sealing body is worn to the same degree as the clearance between the rolling flow-resisting antiwear section and the pump barrel, the clearance between the main sealing body and the pump barrel is not increased any more, and the clearance can be small enough compared with the existing pump clearance.

As a further technical scheme of the invention: the spindle-shaped body is made of wear-resistant rigid material. The wear-resistant rigid material can be selected to have a low friction coefficient, so that the friction force is smaller during the rolling friction of the spindle-shaped body.

The invention has the beneficial effects that:

1. the upper part and the lower part of the hollow plunger piston are rolling flow-resisting and wear-resisting sections, the structure and the layout mode can move relatively between the hollow plunger piston and the pump barrel, and can form a rolling friction mode when indirectly encountering a solid obstacle or directly generating eccentric wear, reduce the friction between the plunger piston and the pump barrel by utilizing the rolling friction mode, slow down the wear and enhance the eccentric wear resistance and the sand wear resistance.

2. When the sucker-rod pump works, the hollow plunger of the sucker-rod pump continuously reciprocates, and when the hollow plunger moves towards one direction, the arc contact surface between the spindle-shaped body on the rolling flow-resisting wear-resisting section and the pump barrel can block part of large sand grains to continuously move towards the middle sealing section; or after being clamped by sand, the spindle body is forced to rotate and is matched with the pump barrel to crush sand grains; or is caught by sand particles and does not rotate. When the hollow plunger moves towards the other direction, sand grains are pushed away from the rolling flow-resisting wear-resisting section by the reverse acting force of fluid or the reverse rotation of the spindle body caused by the reverse friction force, so that the sand grains participating in extrusion and friction are reduced, the abrasion is reduced, and the energy consumption is reduced.

3. The sealing width between the rolling flow-resisting antiwear section and the pump barrel is linear, and the gap can be small enough to form sealing; the main sealing body in the middle of the hollow plunger has enough sealing width, and the gap cannot be expanded to exceed the maximum sealing gap of the rolling wear-resistant section, so that the device ensures the sealing performance of the pump barrel. A plurality of sections of sealing sections are arranged between the hollow plunger and the pump barrel, and each sealing section has different functions to form optimized combined type multilayer sealing, so that the plunger can be allowed to be shorter, the application range of the pump is favorably improved, and the pump efficiency and the lifting system efficiency are improved.

Drawings

FIG. 1 is a schematic view of the main structure of the present invention in the upstroke;

FIG. 2 is a schematic diagram of the main structure of the present invention in the down stroke;

FIG. 3 is a cross-sectional schematic view of a cross-section of a rolling flow resistant antiwear section.

In the figure: 1-pump cylinder, 2-fixed valve assembly, 3-traveling valve assembly, 4-upper joint, 5-rolling flow-resisting and wear-resisting section, 6-groove body, 7-main sealing body, 8-groove, 9-spindle body, 10-supporting protrusion and 11-hollow plunger.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a wear-resistant high-efficiency short plunger rod pump comprises a pump barrel 1, wherein the pump barrel 1 is a main carrier and a working space of the rod pump. The lower part of the pump barrel 1 is provided with a fixed valve assembly 2, and the fixed valve assembly 2 is switched on and off along with the pressure of a lower liquid column, the pressure between the hollow plunger 11 and the pump barrel 1 and the dead weight of a valve ball. The inner cavity of the pump barrel 1 is provided with a traveling valve assembly 3, and the traveling valve assembly 3 is opened and closed along with the pressure of a liquid column on the traveling valve assembly, the pressure between the hollow plunger 11 and the pump barrel 1 and the dead weight of a valve ball. The upper end of the traveling valve assembly 3 is connected with an upper joint 4, the upper joint 4 plays a role of a connecting rod, and the power transmitted by the rod is utilized to drive the rod pump to work.

The lower end of the traveling valve assembly 3 is connected with a hollow plunger 11, the hollow plunger 11 is divided into three parts, one or more rolling flow-blocking wear-resistant sections 5 are arranged on the upper part and the lower part, more than three grooves 8 are formed in the outer wall of the hollow plunger 11 for each rolling flow-blocking wear-resistant section 5, a spindle-shaped body 9 matched with the grooves 8 is connected in a rolling mode in the grooves 8, and the spindle-shaped body 9 can roll up and down along the inner wall of the pump barrel 1. When the spindle-shaped body 9 rolls in the groove 8, a support protrusion 10 is provided inside the groove 8. The supporting bulges 10 are arranged to reduce the contact area between the spindle-shaped body 9 and the groove 8 and reduce the internal friction between the groove 8 and the spindle-shaped body 9; and the spindle-shaped body 9 is made of wear-resistant rigid material, so that the friction force is smaller when the spindle-shaped body 9 is subjected to rolling friction, and the spindle-shaped body 9 can easily form a rigid wear-resistant rolling flow-resisting wear-resisting section.

The shape of the spindle-shaped body 9 is: the maximum outer diameter circle of the rolling flow resistance antiwear section 5 is divided into N sections of arcs (N is more than 3), and a spindle-shaped body formed by rotating 360 degrees by taking the connecting line of two end points of each section of arc as an axis and taking the arc as an edge can form the shape of a spindle-shaped body 9. Therefore, the axes of the spindle-shaped bodies 9 on the same rolling flow-resisting antiwear section 5 are located on the same cross section. Then, according to the number and specification of the spindle-shaped bodies 9, the hollow plunger is provided with a matched groove 8.

The outer side of the middle part of the hollow plunger 11 is provided with a groove body 6, a main sealing body 7 matched with the groove body 6 is arranged in the groove body 6, the outer side of the main sealing body 7 is in contact with the inner wall of the pump barrel 1, and the main sealing body 7 is made of elastic materials. The main sealing body 7 makes up the shortage of the sealing width of the rolling flow-resisting and wear-resisting section 5, is a main sealing part, and the main sealing body 7 made of elastic materials has a compression amount in the radial direction and can have wear compensation in the radial direction according to the wear degree, so that the service life of the main sealing body 7 is prolonged. When the primary sealing body 7 is worn to the same extent that the clearance between the primary sealing body 7 and the pump barrel 1 is equal to the clearance between the rolling flow-resisting wear section 5 and the pump barrel 1, the clearance between the primary sealing body 7 and the pump barrel 1 is not increased any more, and the clearance is small enough compared with the existing pump clearance.

The specific implementation mode of the invention is as follows:

example one

When the engine is in an up stroke (figure 1), the traveling valve assembly 3 and the hollow plunger 11 move upwards, if the friction between the rolling flow-resisting anti-wear section 5 at the upper part and the pump barrel 1, which is generated due to sand resistance, is greater than the rolling friction starting pressure of the spindle-shaped body 9, the spindle-shaped body 9 starts to roll, and crushed sand grains are rolled or sand grains are pushed to move; the sand grains between the rolling flow-resisting antiwear section 5 at the lower part and the pump barrel 1 fall down because the upper pressure of the sand grain accumulation point is higher than the lower pressure, a spindle-shaped body 9 partially blocking the accumulated sand grains and caused by friction starts to roll reversely, and the accumulated sand grains are pushed out. At this time, the traveling valve assembly 3 is closed by the liquid column pressure above the hollow plunger 11 in the pump cylinder 1, the volume of the inner cavity of the pump cylinder 1 below the hollow plunger 11 is increased, the pressure is reduced, the fixed valve assembly 2 is opened by the pressure difference between the upper and lower sides thereof, and the fluid is sucked into the pump cylinder 1. At the same time, if the pump cylinder 1 is gradually filled with liquid, the liquid of the hollow plunger 11 rises. The upstroke is the process of drawing liquid into the barrel 1 and the liquid rising above the hollow plunger 11.

Example two

When the lower stroke (figure 2) is performed, the traveling valve assembly 3 and the hollow plunger 11 move downwards, the pressure of the lower part of the sand between the upper rolling main sealing body 7 and the pump barrel 1 is larger than the upper part pressure due to the sand accumulation point, if the pressure difference is larger than the self weight of the sand, the sand begins to separate from the accumulation point, and if the accumulated sand in the upper stroke acts on the accumulation friction, the spindle-shaped body 9 begins to roll reversely, and the sand can be pushed out; the spindle-shaped body 9 between the rolling main sealing body 7 at the lower part and the pump barrel 1, which is caused by the friction due to the partial blockage and the accumulation of sand grains, starts to roll to extrude broken sand grains, so that the damage to the middle sealing section 7 is reduced. The hollow plunger 11 compresses the liquid between the fixed valve assembly 2 and the traveling valve assembly 3: when the pressure in the pump cylinder 1 increases to be larger than the sinking pressure of the pump cylinder 1, the fixed valve assembly 2 is closed firstly, when the pressure in the pump cylinder 1 increases to be larger than the liquid pressure above the hollow plunger 11, the traveling valve assembly 3 is jacked open, and the liquid below the hollow plunger 11 enters the upper part of the hollow plunger 11 through the traveling valve assembly 3, so that the pump cylinder 1 discharges the liquid. The down stroke is a process of discharging liquid from the pump barrel 1 to the upper part of the hollow plunger 11. In the moving process of the hollow plunger 11, rolling friction can be formed between the rolling flow resistance anti-wear section 5 and the pump barrel 1 due to eccentric wear, and the wear speed of the eccentric wear on the main body of the hollow plunger 11 and the pump barrel 1 can be reduced.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.