CN211852137U - Standing valve and deep-draw pump - Google Patents

Abstract

The utility model relates to a standing valve and deep-draw pump, wherein, the standing valve includes the standing valve cover, standing valve ball and solid fixed valve seat, be formed with a plurality of first muscle of rightting along its axial extension on the middle part inner wall of standing valve cover, a plurality of first muscle of rightting are arranged along standing valve cover circumference interval, every first inner wall of righting the muscle is the cambered surface, the diameter of the first circular through-hole that the inner wall of a plurality of first muscle of righting encloses is greater than the diameter of solid fixed valve ball, solid fixed valve seat establishes and is greater than the internal diameter of solid fixed valve seat in the below of first muscle of righting and the diameter of solid fixed valve ball. The utility model provides a standing valve and deep-draw pump can reduce the clearance between standing valve ball and the standing valve cover, reduces the swing range of standing valve ball for the falling of standing valve ball can the centering, prevents the leakage problem that the standing valve seat caused because of the eccentric wear.

Description

Standing valve and deep-draw pump

Technical Field

The utility model belongs to the technical field of the sucker-rod pump oil recovery technology among the oil recovery, especially, relate to a standing valve and deep-draw pump, mainly used thin oil recovery.

Background

The low-permeability reservoir is unbalanced in injection and production, the formation energy is gradually reduced along with the extension of the production time, the pump hanging depth is gradually deepened, and the times of the movable valve cover breakage, pump blockage and pump leakage detection pump wells are greatly increased. At present, the problem of fracture of a traveling valve cover is solved by mainly adopting three structures, namely an upper traveling valve moves downwards, a long plunger traveling valve removes a pump cylinder and a solid plunger; the pump is prevented from being jammed due to various sundries by adopting a protection device on the pump, a multifunctional anti-jamming device and other matched tools; the double-cylinder structure is adopted to solve the problem of pump expansion so as to prolong the service life of the pump cylinder.

The methods all achieve the purposes of prolonging the pump detection period of the oil well to a certain extent and achieving certain measure effects, but still have the following problems:

(1) the use of the matched tools increases the adoption cost, and the increase of the matched tools makes the production string more complicated and reduces the reliability and safety of the string; meanwhile, the anti-blocking capability is poor due to the fact that the deposition space of the tool is limited and the matched tool is used; however, if a matching tool is not added, iron chips or other impurities generated by eccentric wear of the pipe rod and the like are deposited in the pump, so that the pump clamping phenomenon is serious, and the normal work of the pump is influenced.

(2) In order to guarantee that liquid can pass through the standing valve smoothly when the feed liquor among the prior art, the clearance between general standing valve ball and the standing valve cover inner wall is great, and general clearance is 7 ~ 8 mm. However, the too large gap easily causes a large swing range of the ball, the ball is not easy to center when falling, and the fixed valve seat is easy to be eccentrically worn, so that the fixed valve is easy to leak; meanwhile, the falling time of the fixed valve ball is generally long, and the fixed valve is not closed timely, so that the fixed valve can be lost.

(3) Iron chips or other impurities are easy to deposit on the traveling valve seat, so that the sealing of the traveling valve is not tight, and the leakage of the traveling valve is caused.

Therefore, the inventor provides a fixed valve and a deep-pumping pump by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a standing valve and deep-draw pump can reduce the clearance between standing valve ball and the standing valve cover, reduces the swing range of standing valve ball for the falling of standing valve ball can the centering, prevents the leakage problem that the standing valve seat caused because of the eccentric wear.

The purpose of the utility model can be realized by adopting the following technical scheme:

the utility model provides a fixed valve, which comprises a fixed valve cover, a fixed valve ball and a fixed valve seat; a plurality of first righting ribs extending along the axial direction are formed on the inner wall of the middle part of the fixed valve cover, the plurality of first righting ribs are distributed at intervals along the circumferential direction of the fixed valve cover, the inner wall of each first righting rib is an arc surface, and the diameter of a first circular through hole formed by the inner walls of the plurality of first righting ribs in a surrounding mode is larger than the diameter of the fixed valve ball; the fixed valve seat is arranged below the first righting rib, and the diameter of the fixed valve ball is larger than the inner diameter of the fixed valve seat.

In a preferred embodiment of the present invention, the diameter of the first circular through hole is 2mm larger than the diameter of the fixed valve ball.

The utility model discloses an in a preferred embodiment, still including fixing the elasticity canceling release mechanical system in the fixed valve cover, elasticity canceling release mechanical system's lower extreme supports and leans on fixed valve ball.

The utility model discloses an in a preferred embodiment, elasticity canceling release mechanical system includes and establishes the reset spring on stop screw with the fixed stop screw and the cover that the fixed valve bonnet is fixed, and reset spring's lower extreme supports and leans on the fixed valve ball.

The utility model also provides a deep-draw pump, include: a vertically arranged pump barrel; the traveling valve comprises a traveling valve cover fixed at the lower end of the pump barrel, a liquid outlet hole communicated with the outlet end of the traveling valve and the outer side of the traveling valve cover is arranged in the side wall of the traveling valve cover, and a first axial through hole communicated with the inlet end of the traveling valve and the inner cavity of the pump barrel is also arranged in the side wall of the traveling valve cover; the fixed valve is fixed at the lower end of the traveling valve cover, and the outlet end of the fixed valve is communicated with the inlet end of the traveling valve; and the solid plunger can be sleeved in the pump barrel in a sliding manner.

The utility model discloses an among the preferred embodiment, be equipped with the passageway that overflows that the bottom was run through to the axial in the lower part of the valve bonnet that moves about, be equipped with the bulge loop that the diameter reduces at the middle part of overflowing the passageway, be equipped with the valve ball that moves about that can the shutoff overflowed the passageway between the top surface of valve bonnet that moves about and the bulge loop, the traveling valve exit end that the top of bulge loop constitutes overflows the traveling valve entry end that the passageway bottom constitutes.

In a preferred embodiment of the present invention, the liquid outlet is in the shape of a horn which is gradually enlarged outwards.

In a preferred embodiment of the present invention, the traveling valve further comprises a traveling valve seat connection pipe fixed to the inner wall of the lower end of the flow passage; a floating valve seat is propped between the middle part of the flow passage and the upper end of the floating valve seat connecting pipe, and the floating valve seat forms a convex ring.

In a preferred embodiment of the present invention, the fixed valve further comprises a fixed valve connection pipe and a fixed valve seat connection pipe; the upper end and the lower end of the fixed valve connecting pipe are respectively fixed with the lower end of the moving valve cover and the upper end of the fixed valve cover, the upper end of the fixed valve seat connecting pipe is fixedly connected with the lower end of the fixed valve cover, and the upper end of the fixed valve connecting pipe forms a fixed valve outlet end.

In a preferred embodiment of the present invention, the length of the solid plunger is greater than the length of the pump barrel, and the diameter of the solid plunger is the same as the inner diameter of the pump barrel.

In a preferred embodiment of the present invention, the solid plunger includes an upper plunger connector, a plunger rod and a lower plunger connector fixed in sequence from top to bottom, and the lower end of the lower plunger connector is a tapered conical surface tapering downward.

In a preferred embodiment of the present invention, the deep-pumping pump further comprises an outer tube, a two-way joint and a sand setting tail tube with a closed lower end, which are sequentially fixed from top to bottom; the outer tube is sleeved on the outer wall of the pump barrel at intervals, the annular accommodating space is formed at the intervals, the upper end of the two-way connector is fixed to the lower end of the fixed valve, a liquid inlet hole for communicating the outer side of the two-way connector with the inlet end of the fixed valve is formed in the side wall of the two-way connector, and a second axial through hole for communicating the annular accommodating space with the inner cavity of the sand settling tail pipe is formed in the side wall of the two-way connector.

In a preferred embodiment of the present invention, a sieve tube is disposed on the outer wall of the two-way joint and at a position corresponding to the liquid inlet hole.

In a preferred embodiment of the present invention, the pump barrel comprises an upper pump barrel, a centering connection pipe, a lower pump barrel and a lower connection pipe which are fixed in sequence from top to bottom; the upper end sleeve of going up the pump barrel is equipped with the cover of rightting, and the outer wall of righting the cover and the outer wall of righting the takeover are all formed with a plurality of pieces of righting along circumference interval, and this interval is linked together with annular accommodation space.

The utility model discloses an among the preferred embodiment, still be fixed with the direction in the upper end of outer tube and take over, the muscle is right to a plurality of second along its axial extension that are formed with on the lower extreme inner wall of direction takeover, and a plurality of second are right the muscle and are arranged along direction takeover circumference interval, and the inner wall that the muscle was right to every second is the cambered surface, and the diameter of the circular through-hole of second that the inner wall of muscle was right to a plurality of second encloses is greater than the diameter of solid plunger.

From the above, in the fixed valve and the deep-pumping pump of the present invention, the plurality of first centering ribs are disposed in the fixed valve cover, and the circular channel surrounded by the first centering ribs is used as the valve ball moving channel, so that the gap between the circular channel and the fixed valve ball is small and the swing range of the fixed valve ball is limited; and the interval between the area between two adjacent first righting muscle and the fixed valve ball is great and as the main inlet channel during feed liquor, and the overwhelming majority of liquid all passes through from main inlet channel during feed liquor, and only a small part of liquid passes through from the motion passageway. Therefore, through setting up of first muscle of righting separately valve ball motion passageway and main inlet channel, liquid can pass through smoothly when both having guaranteed the feed liquor, and the swing range when again to the motion of fixed valve ball constitutes certain limiting action, has reduced the swing range of fixed valve ball for the fixed valve ball whereabouts can the centering, and then has prevented the fixed valve leakage problem that the standing valve seat caused because of the eccentric wear, and simple structure.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: for the utility model provides a structure cross-sectional view on upper portion of deep-pumping pump.

FIG. 2: for the utility model provides a structure cross-sectional view of the lower part of deep-pumping pump.

FIG. 3: a cross-sectional view of the stationary valve housing of fig. 2 taken along the direction M-M.

FIG. 4: is a cross-sectional view taken along the direction N-N in fig. 3.

FIG. 5: is a cross-sectional view taken along the line a-a in fig. 1.

FIG. 6: which is a cross-sectional view taken along the direction B-B in fig. 1.

FIG. 7: is a cross-sectional view taken along the direction C-C in fig. 1.

FIG. 8: which is a cross-sectional view taken along the direction D-D in fig. 2.

FIG. 9: which is a cross-sectional view taken along the direction E-E in fig. 2.

FIG. 10: is a cross-sectional view taken along the direction F-F in fig. 2.

The reference numbers illustrate:

1. a pump barrel; 11. an upper pump barrel; 111. a centralizing sleeve; 12. righting the connecting pipe; 13. a pump cylinder is arranged; 14. a lower connection pipe;

2. a traveling valve; 21. a traveling valve cover; 211. a liquid outlet hole; 212. a first axial through hole; 22. a floating valve ball; 23. a traveling valve seat; 24. a movable valve seat connecting pipe;

3. a fixed valve; 31. a fixed valve connection pipe; 32. a limit screw; 33. fixing the valve cover; 331. a first righting rib; 34. a return spring; 35. fixing the valve ball; 36. a fixed valve seat; 37. a fixed valve seat connecting pipe;

4. a plunger upper joint; 5. a plunger rod; 6. a plunger lower joint;

7. an outer tube; 71. guiding the connecting pipe; 711. a second strengthening rib; 72. an oil pipe nipple; 73. a tubing coupling;

8. a two-way joint; 81. a liquid inlet hole; 82. a second axial through hole; 83. a screen pipe; 831. a screen pipe positioning sleeve;

9. a sand setting tail pipe; 91. a tail connecting pipe; 92. and (5) plugging with a thread.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 2, 3 and 4, the present embodiment provides a fixed valve 3 including a fixed valve cover 33, a fixed valve ball 35 and a fixed valve seat 36. A plurality of first righting ribs 331 extending along the axial direction are formed on the inner wall of the middle portion of the fixed valve cover 33, the plurality of first righting ribs 331 are arranged along the circumferential direction of the fixed valve cover 33 at intervals, the inner wall of each first righting rib 331 is an arc surface (the arc surface extending along the circumferential direction of the fixed valve cover 33), and the diameter of a first circular through hole formed by the inner walls of the plurality of first righting ribs 331 is larger than that of the fixed valve ball 35. The stationary valve seat 36 is disposed below the first centering rib 331 and the diameter of the stationary valve ball 35 is larger than the inner diameter of the stationary valve seat 36.

Wherein, the fixed valve cover 33 is the tubular structure of both ends open-ended, and the diameter of general first circular port is greater than the diameter 2mm of fixed valve ball 35, and the clearance between fixed valve ball 35 and the first muscle 331 inner wall of righting promptly is 1mm, and then has reduced the clearance between fixed valve ball 35 and the fixed valve cover 33. And the maximum clearance between the area between two adjacent first righting muscle 331 and fixed valve ball 35 still sets up to 7 ~ 8mm to as main inlet channel, liquid can pass through smoothly when guaranteeing the feed liquor. Generally, four first centering ribs 331 may be provided as shown in fig. 3, and a sidewall of an area between two adjacent first centering ribs 331 is arc-shaped, and of course, other numbers of first centering ribs 331 may also be provided as required, and this embodiment is only for example.

Therefore, in the fixed valve 3 of the present embodiment, the plurality of first centering ribs 331 are provided in the fixed valve housing 33, and a circular channel surrounded by the first centering ribs is used as a valve ball movement channel, so that a gap between the first centering ribs and the fixed valve ball 35 is small, and a certain limitation is provided for a swing range of the fixed valve ball 35; and the gap between the area between two adjacent first righting ribs 331 and the fixed valve ball 35 is larger and is used as a main liquid inlet channel during liquid inlet, most of liquid passes through the main liquid inlet channel during liquid inlet, and only a small part of liquid passes through the moving channel. Therefore, the valve ball movement channel and the main liquid inlet channel are separated through the arrangement of the first righting rib 331, liquid can smoothly pass through the valve ball movement channel when liquid inlet is guaranteed, a certain limiting effect is formed on the swing range of the fixed valve ball 35 during movement, the swing range of the fixed valve ball 35 is reduced, the fixed valve ball 35 can fall in a centering mode, the problem that the fixed valve seat 36 is lost due to eccentric wear due to the fact of the fixed valve 3 is solved, and the structure is simple.

In a specific implementation manner, in order to avoid the leakage of the fixed valve 3 caused by the untimely falling of the fixed valve ball 35, the fixed valve 3 further comprises an elastic reset mechanism fixed in the fixed valve cover 33, and the lower end of the elastic reset mechanism abuts against the fixed valve ball 35. In this way, the fixed valve ball 35 can elastically abut against the fixed valve seat 36 under the action of the elastic return mechanism, and the fixed valve 3 is closed. Through the setting of elasticity canceling release mechanical system, can force fixed valve ball 35 to reset, reduce the whereabouts time of fixed valve ball 35, and then avoid the fixed valve 3 that causes because of the fixed valve ball 35 whereabouts lags the problem of leaking.

In practical application, as shown in fig. 2 and 9, the elastic return mechanism includes a limit screw 32 fixed to the fixed valve cover 33 and a return spring 34 sleeved on the limit screw 32, and a lower end of the return spring 34 abuts against the fixed valve ball 35.

The cross section of the head of the limit screw 32 is generally in an oblong shape, two ends of the oblong head are in threaded connection with the inner wall of the upper end of the fixed valve cover 33, and a gap between two sides of the oblong head and the inner wall of the fixed valve cover 33 forms a liquid flow passage so as to enable liquid to flow. The reset spring 34 is sleeved on the screw rod of the limit screw 32, and the length of the reset spring 34 is greater than that of the screw rod, so that the bottom end of the reset spring 34 is always supported on the fixed valve ball 35 to play a reset role. In addition, the length of the screw shaft of the limit screw 32 is such that the vertical movement of the fixed ball 35 is always located in the ball movement path. Of course, in practical applications, the elastic reset mechanism may also be implemented by other structures, and this embodiment is only an example.

As shown in fig. 1 to 4 and 8, the present embodiment further provides a deep-pumping pump, which includes a vertically arranged pump cylinder 1, a traveling valve 2, the above-mentioned fixed valve 3 and a solid plunger.

The traveling valve 2 comprises a traveling valve cover 21 fixed at the lower end of the pump barrel 1, a liquid outlet 211 communicating the outlet end of the traveling valve 2 with the outside of the traveling valve cover 21 (i.e. an annular accommodating space described below) is arranged in the side wall of the traveling valve cover 21, and a first axial through hole 212 communicating the inlet end of the traveling valve 2 with the inner cavity of the pump barrel 1 is arranged in the side wall of the traveling valve cover 21. The fixed valve 3 is fixed at the lower end of the traveling valve cover 21, the outlet end of the fixed valve 3 is communicated with the inlet end of the traveling valve 2, and the solid plunger piston can be slidably sleeved in the pump barrel 1.

Specifically, when liquid needs to be fed, the fixed valve 3 is opened, the traveling valve 2 is closed, the solid plunger moves upwards, at the moment, well liquid flows out from the outlet end of the fixed valve 3 after passing through the fixed valve 3, and then enters the inner cavity of the pump barrel 1 through the first axial through hole 212 to complete liquid feeding. When liquid needs to be drained, the fixed valve 3 is closed, the traveling valve 2 is opened, well liquid in the inner cavity of the pump barrel 1 enters the inlet end of the traveling valve 2 through the first axial through hole 212 and then flows into an annular accommodating space through the outlet end of the traveling valve 2 and the liquid outlet hole 211 to finish drainage.

The deep-pumping pump in this embodiment sets up solid plunger and traveling valve 2 separately, and traveling valve 2 no longer establishes inside solid plunger, because the pump footpath of every deep-pumping pump all has size restriction, consequently, under the limited condition in pump footpath, the traveling valve bonnet 21 of this embodiment is bigger for establishing the structure in the plunger with traveling valve 2 in the current, and then has increased the intensity of traveling valve bonnet 21, has avoided the fracture of traveling valve bonnet 21. Meanwhile, the solid plunger does not overflow any more, and the whole solid plunger is of a solid structure, so that the strength of the solid plunger is greatly increased. The whole deep-pumping pump is simple in structure, convenient to process, low in cost and capable of guaranteeing that an oil well is normal, prolonging the pump inspection period, reducing the oil extraction cost and improving the oil well time rate, and matched tools in the prior art are not required to be added.

In a specific implementation manner, as shown in fig. 2 and 8, a flow passage axially penetrating through the bottom is provided at the lower part of the moving valve cover 21, a collar with a reduced diameter is provided at the middle part of the flow passage, a moving valve ball 22 capable of blocking the flow passage is provided between the top surface of the moving valve cover 21 and the collar, the top end of the collar constitutes the outlet end of the moving valve 2, and the bottom end of the flow passage constitutes the inlet end of the moving valve 2.

Specifically, the traveling valve ball 22 is disposed opposite to the liquid outlet hole 211, and when the traveling valve 2 is opened, foreign matter outside the traveling valve 2 is likely to enter the traveling valve 2 through the liquid outlet hole 211 to cause the traveling valve 2 to leak, so in practical use, the liquid outlet hole 211 is in a flared shape gradually expanding outward in order to avoid the foreign matter entering the traveling valve 2 during liquid outlet and to reduce upward resistance when the liquid flows out from the liquid outlet hole 211.

Therefore, when the liquid is discharged, the impurities outside the traveling valve 2 (i.e. the impurities in the annular accommodating space described below) basically do not enter the traveling valve 2 through the liquid outlet hole 211, but deposit along the inner wall of the lower part of the trumpet-shaped liquid outlet hole 211 to the bottom of the annular accommodating space described below, so that the impurities are prevented from depositing on the convex ring (i.e. the traveling valve seat 23 described below), and the traveling valve 2 is prevented from being leaked due to the untight sealing of the traveling valve 2.

In order to facilitate processing and installation, the traveling valve 2 further comprises a traveling valve seat connecting pipe 24 fixed with the inner wall of the lower end of the flow passage, a traveling valve seat 23 is supported between the middle part of the flow passage and the upper end of the traveling valve seat connecting pipe 24, and the traveling valve seat 23 forms the convex ring. The diameter of the floating valve ball 22 is larger than the inner diameter of the floating valve seat 23, a first limiting step with a reduced diameter is formed upwards on the inner wall of the middle part of the flow passage, the top surface of the floating valve seat 23 abuts against the first limiting step, the bottom surface of the floating valve seat 23 abuts against the top surface of the floating valve seat connecting pipe 24, and the outer wall of the floating valve seat connecting pipe 24 is in threaded connection with the inner wall of the lower end of the flow passage.

Further, the above-described fixed valve 3 further includes a fixed valve nipple 31 and a fixed valve seat nipple 37 for convenience of processing and installation. The upper end and the lower end of the fixed valve connecting pipe 31 are respectively fixed with the lower end of the moving valve cover 21 and the upper end of the fixed valve cover 33, the upper end of the fixed valve seat connecting pipe 37 is fixedly connected with the lower end of the fixed valve cover 33, and the upper end of the fixed valve connecting pipe 31 forms the outlet end of the fixed valve 3.

The upper outer wall of the fixed valve adapter 31 is screwed to the lower inner wall of the traveling valve housing 21, and the lower inner wall of the fixed valve adapter 31 is screwed to the upper outer wall of the fixed valve housing 33. The lower end inner wall of the fixed valve cover 33 is located below the first righting rib 331 to form a second limiting step with a reduced diameter, the top surface of the fixed valve seat 36 abuts against the second limiting step, the bottom surface of the fixed valve seat 36 abuts against the top surface of the fixed valve seat connecting pipe 37, and the upper end outer wall of the fixed valve seat connecting pipe 37 is in threaded connection with the lower end inner wall of the fixed valve cover 33.

Further, in order to avoid pump jamming caused by foreign matters entering the pump barrel 1, the length of the solid plunger is larger than that of the pump barrel 1, and the diameter of the solid plunger is the same as the inner diameter of the pump barrel 1. So, no matter how do solid plunger reciprocate, the upper end of solid plunger all is located the outside of pump barrel 1, simultaneously because the diameter of solid plunger is the same with the internal diameter of pump barrel 1 for there is not the clearance confession debris between solid plunger and the pump barrel 1 to pass through, and then has avoided getting into debris in the pump barrel 1.

In order to facilitate processing and installation, the solid plunger comprises an upper plunger connector 4, a plunger rod 5 and a lower plunger connector 6 which are sequentially fixed from top to bottom, and the lower end of the lower plunger connector 6 is a conical surface which is gradually reduced downwards, so that the solid plunger can smoothly move downwards and can play a role in guiding when moving downwards. Wherein, generally, the top surface of the upper end of the plunger upper joint 4 is provided with an internal thread hole so as to be fixed with the sucker rod when in use. The inner wall of the upper end of the plunger rod 5 is in threaded connection with the outer wall of the lower end of the plunger upper joint 4, and the inner wall of the lower end of the plunger rod 5 is in threaded connection with the outer wall of the upper end of the plunger lower joint 6.

Further, if the oil pipe column is directly sleeved outside the pump barrel 1, iron chips or other impurities are easily deposited in the pump and continuously accumulated due to the fact that the lower end is a dead cavity when the oil pipe column is used, and the pump is easily clamped. Therefore, in order to avoid the pump jamming phenomenon caused by the deposition of iron chips or other impurities in the pump, as shown in fig. 1, 2 and 10, the whole deep-pumping pump further comprises an outer pipe 7, a double-way joint 8 and a sand setting tail pipe 9 with a closed lower end, wherein the outer pipe 7, the double-way joint 8 and the sand setting tail pipe are sequentially fixed from top to bottom. The outer tube 7 is sleeved on the outer wall of the pump barrel 1 at intervals, the intervals form an annular accommodating space, the upper end of the two-way joint 8 is further fixed with the lower end of the fixed valve 3, a liquid inlet hole 81 for communicating the outer side of the two-way joint 8 with the inlet end of the fixed valve 3 (namely the lower end of the fixed valve seat connecting tube 37) is arranged in the side wall of the two-way joint 8, and a second axial through hole 82 for communicating the annular accommodating space with the inner cavity of the sand setting tail tube 9 is further arranged in the side wall of the two-way joint 8.

For the convenience of liquid feeding, the liquid feeding hole 81 is generally formed by inclining the sidewall of the double-way joint 8 to the inner cavity of the double-way joint 8. For convenience of processing and installation, the sand setting tail pipe 9 comprises a tail connecting pipe 91 and a pipe plug 92 which are fixed up and down, and the upper end of the tail connecting pipe 91 is fixedly connected with the lower end of the two-way joint 8. The lower outer wall of the rear adapter 91 is generally screwed with the upper inner wall of the plug 92.

When the pump is used, scrap iron or other impurities on the pump are deposited and then enter the annular accommodating space, then enter the sand setting tail pipe 9 through the second axial through hole 82, and the impurities in the sand setting tail pipe 9 can be cleaned by disassembling the plug 92 after construction is finished. From this, through the setting of bi-pass joint 8 for inlet channel separates with sand setting passageway, and debris can deposit in sand setting tail pipe 9, can regularly clear up sand setting tail pipe 9 as required, has avoided debris to pile up in the pump (mainly avoid debris constantly to pile up in annular accommodation space), and then effectively avoids mechanical debris such as iron fillings and oil well sand production, scale deposit to deposit in the pump and the card pump that causes.

In order to avoid the pump blockage problem caused by the fact that impurities in well liquid enter the pump barrel 1 along with the well liquid during liquid feeding, a sieve pipe 83 is sleeved on the outer wall of the double-way connector 8 and the position corresponding to the liquid feeding hole 81 so as to filter the impurities in the well liquid. Generally, a screen pipe positioning sleeve 831 is further welded on the outer wall of the tail connecting pipe 91 in a sleeved mode, the lower end of the screen pipe 83 abuts against the upper end of the screen pipe positioning sleeve 831, and the screen pipe 83 is welded and fixed with the two-way joint 8 and the outer wall of the tail connecting pipe 91.

Further, for the convenience of processing and installation, and at the same time, the pump barrel 1 is centered, and as shown in fig. 1, 2, 6 and 7, the pump barrel 1 includes an upper pump barrel 11, a centering connection pipe 12, a lower pump barrel 13 and a lower connection pipe 14, which are sequentially fixed from top to bottom. The upper end of the upper pump barrel 11 is sleeved with a centering sleeve 111, a plurality of centering blocks are formed on the outer wall of the centering sleeve 111 and the outer wall of the centering connecting pipe 12 at intervals along the circumferential direction, and the intervals are communicated with the annular accommodating space.

Generally, the outer wall of the upper end of the upper pump barrel 11 is in threaded connection with the inner wall of the centering sleeve 111, the outer wall of the lower end of the upper pump barrel 11 is in threaded connection with the inner wall of the upper end of the centering connecting pipe 12, the outer wall of the upper end of the lower pump barrel 13 is in threaded connection with the inner wall of the lower end of the centering connecting pipe 12, the outer wall of the lower end of the lower pump barrel 13 is in threaded connection with the inner wall of the upper end of the lower connecting pipe 14, and the outer wall of the lower end of the lower joint is in. The centering sleeve 111, the centering block on the outer wall of the centering sleeve 111, the outer wall of the centering connecting pipe 12 and the centering block on the outer wall of the centering connecting pipe are generally formed into a whole, and gaps are arranged between the centering block on the centering sleeve 111 and the centering block on the centering connecting pipe 12 and the inner wall of the upper pump barrel 11, and the gaps are generally 1-2 mm.

Further, in order to achieve the guiding and centering function when the solid plunger is inserted into the pump barrel 1 and facilitate iron chips or other impurities to smoothly enter the annular accommodating space, as shown in fig. 1 and 5, a guiding connection pipe 71 is further fixed at the upper end of the outer pipe 7, a plurality of second centering ribs 711 extending along the axial direction of the guiding connection pipe are formed on the inner wall of the lower end of the guiding connection pipe 71, the second centering ribs 711 are circumferentially arranged along the guiding connection pipe 71 at intervals, the inner wall of each second centering rib 711 is an arc surface, and the diameter of a second circular through hole formed by the inner walls of the second centering ribs 711 is larger than the diameter of the solid plunger (specifically, the diameter of the circular hole is larger than the diameter of the plunger rod 5).

Wherein, the diameter of general this circular through-hole of second is greater than the scope of the diameter of solid plunger and is 2 ~ 4mm, and when solid plunger went into pump barrel 1, directly just can just be just to pump barrel 1 to second circular port income, avoids the skew. In order to facilitate the smooth downward movement of the solid plunger, the top surface of each second centering rib 711 is formed with an inclined surface which is inclined upward from the inner cavity of the guide adapter 71 to the outer wall of the guide adapter 71. The area between the second centering ribs 711 is used for iron chips or other impurities to deposit and pass, and generally the area is made as large as possible, for example, three second centering ribs 711 may be provided as shown in fig. 5, and the side wall of the area between two adjacent second centering ribs 711 is arc-shaped. Of course, the guide connection tube 71 can be made in other forms as required, as long as it is convenient for the solid plunger to center into the pump and for impurities to deposit and pass through, and this embodiment is only for illustration.

In addition, in order to facilitate connection with a tubing when in use, a tubing nipple 72 and a tubing collar 73 are sequentially fixed on the upper end of the guide adapter 71 from bottom to top. The inner wall of the upper end of the general guide connection pipe 71 is in threaded connection with the outer wall of the lower end of the tubing nipple 72, the outer wall of the upper end of the tubing nipple 72 is in threaded connection with the inner wall of the lower end of the tubing coupling 73, and the inner wall of the upper end of the tubing coupling 73 is in threaded connection with the outer wall of the lower end of the tubing when the guide connection pipe is used.

In order to better understand the scheme of the embodiment, the following detailed description is made on the working process of the whole deep-pumping pump in the embodiment, specifically as follows:

and (3) well descending: the upper end of an oil pipe coupling 73 is connected with an oil pipe and then is put into the well, the upper end of a plunger upper joint 4 is connected with a sucker rod and then a solid plunger is put into a pump barrel 1, the solid plunger can move up and down along with the sucker rod, and the pump barrel 1 and an outer pipe 7 are not moved.

An upstroke: the solid plunger moves upwards along with the sucker rod, the traveling valve 2 sits on the traveling valve seat 23 under the action of self-weight to close the traveling valve 2, the fixed valve 3 leaves the fixed valve seat 36 under the action of sinking pressure to open the fixed valve 3, well fluid enters the fixed valve 3 through the sieve tube 83 and the fluid inlet hole 81, enters the inner cavity of the pump barrel 1 through the fixed valve seat connecting tube 37, the fixed valve seat 36, the fixed valve cover 33, the fixed valve connecting tube 31 and the first axial through hole 212 on the traveling valve cover 21 (because the pressure generated during fluid inlet is smaller than the self-weight of the traveling valve ball 22, in the fluid inlet stage, a part of the well fluid enters the traveling valve seat 24 and the traveling valve seat 23, the traveling valve ball 22 is not jacked out by the connecting tube, and the traveling valve 2 still keeps a closed state, so that fluid inlet.

A down stroke: the solid plunger moves downwards along with the sucker rod, the fixed valve ball 35 is seated on the fixed valve seat 36 under the action of self weight and the return spring 34 to close the fixed valve 3, when the solid plunger moves downwards, the pressure of the inner cavity of the pump barrel 1 is increased and is larger than the pressure in the annular accommodating space, the inlet end of the traveling valve 2 is communicated with the inner cavity of the pump barrel 1 through the first axial through hole 212, so that the pressure at the inlet end of the traveling valve 2 is also increased along with the increase of the pressure in the inner cavity of the pump barrel 1, namely the pressure in the traveling valve seat connecting pipe 24 and the traveling valve seat 23 is increased, and when the pressure is larger than the pressure in the annular accommodating space, the traveling valve ball 22 is jacked to open the. At this time, the liquid in the inner cavity of the pump barrel 1 enters the annular accommodating space through the first axial through hole 212, the floating valve seat connecting pipe 24, the floating valve seat 23 and the liquid outlet hole 211, and finally the liquid in the annular accommodating space moves upwards to enter the oil pipe, so that the liquid discharge of the pump is realized.

The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (15)

1. A fixed valve is characterized by comprising a fixed valve cover, a fixed valve ball and a fixed valve seat;

a plurality of first righting ribs extending along the axial direction of the fixed valve cover are formed on the inner wall of the middle of the fixed valve cover, the first righting ribs are distributed at intervals along the circumferential direction of the fixed valve cover, the inner wall of each first righting rib is an arc surface, and the diameter of a first circular through hole formed by the inner walls of the first righting ribs in a surrounding mode is larger than that of the fixed valve ball; the fixed valve seat is arranged below the first righting rib, and the diameter of the fixed valve ball is larger than the inner diameter of the fixed valve seat.

2. The fixed valve of claim 1,

the diameter of the first circular through hole is 2mm larger than that of the fixed valve ball.

3. The fixed valve of claim 1,

the valve also comprises an elastic reset mechanism fixed in the fixed valve cover, and the lower end of the elastic reset mechanism is abutted against the fixed valve ball.

4. The fixed valve of claim 3,

the elastic reset mechanism comprises a limit screw fixed with the fixed valve cover and a reset spring sleeved on the limit screw, and the lower end of the reset spring is abutted against the fixed valve ball.

5. A deep draw pump, comprising:

a vertically arranged pump barrel;

the traveling valve comprises a traveling valve cover fixed at the lower end of the pump barrel, a liquid outlet hole communicated with the outlet end of the traveling valve and the outer side of the traveling valve cover is arranged in the side wall of the traveling valve cover, and a first axial through hole communicated with the inlet end of the traveling valve and the inner cavity of the pump barrel is also arranged in the side wall of the traveling valve cover;

the fixed valve of any one of claims 1 to 4, fixed to the lower end of the traveling valve housing, with the fixed valve outlet end communicating with the traveling valve inlet end;

and the solid plunger can be sleeved in the pump barrel in a sliding manner.

6. Deep-draw pump according to claim 5,

the lower part of the moving valve cover is provided with a flow passage which axially penetrates through the bottom, the middle part of the flow passage is provided with a convex ring with a reduced diameter, a moving valve ball which can block the flow passage is arranged between the top surface of the moving valve cover and the convex ring, the top end of the convex ring forms the outlet end of the moving valve, and the bottom end of the flow passage forms the inlet end of the moving valve.

7. Deep-draw pump according to claim 6,

the liquid outlet hole is in a horn shape which is gradually expanded outwards.

8. The deep draw pump of claim 6, wherein the traveling valve further comprises a traveling valve seat adapter fixed to an inner wall of a lower end of the transfer passage;

and a moving valve seat is propped between the middle part of the overflowing channel and the upper end of the moving valve seat connecting pipe, and the moving valve seat forms the convex ring.

9. The deep draw pump of claim 5, wherein the fixed valve further comprises a fixed valve nipple and a fixed valve seat nipple;

the upper end and the lower end of the fixed valve connecting pipe are respectively fixed with the lower end of the moving valve cover and the upper end of the fixed valve cover, the upper end of the fixed valve seat connecting pipe is fixedly connected with the lower end of the fixed valve cover, and the upper end of the fixed valve connecting pipe forms the outlet end of the fixed valve.

10. Deep-draw pump according to claim 5,

the solid plunger is longer than the pump barrel, and the diameter of the solid plunger is the same as the inner diameter of the pump barrel.

11. Deep-draw pump according to claim 5,

the solid plunger comprises an upper plunger connector, a plunger rod and a lower plunger connector which are sequentially fixed from top to bottom, and the lower end of the lower plunger connector is a conical surface which is gradually reduced downwards.

12. The deep suction pump according to claim 5, further comprising an outer pipe, a two-way joint, and a sand setting tail pipe having a closed lower end, which are sequentially fixed from top to bottom;

the outer tube is established on the pump barrel outer wall at interval ground cover, and this interval constitutes annular accommodation space, the bi-pass connects the upper end still with the standing valve lower extreme is fixed, be equipped with the feed liquor hole that the intercommunication bi-pass connects the outside and standing valve entry end in the lateral wall that the bi-pass connects, still be equipped with the intercommunication in the lateral wall that the bi-pass connects annular accommodation space with the second axial through-hole of sand setting tail pipe inner chamber.

13. Deep-draw pump according to claim 12,

the outer wall of the double-way connector is sleeved with a sieve tube at a position corresponding to the liquid inlet hole.

14. The deep-drawing pump of claim 12, wherein the pump cylinder comprises an upper pump cylinder, a centering connection pipe, a lower pump cylinder and a lower connection pipe which are sequentially fixed from top to bottom;

the upper end sleeve of the upper pump barrel is provided with a centering sleeve, the outer wall of the centering sleeve and the outer wall of the centering connecting pipe are circumferentially provided with a plurality of centering blocks at intervals, and the intervals are communicated with the annular accommodating space.

15. Deep-draw pump according to claim 12,

the upper end of the outer pipe is further fixed with a guide connecting pipe, a plurality of second righting ribs extending along the axial direction of the guide connecting pipe are formed on the inner wall of the lower end of the guide connecting pipe, the second righting ribs are distributed at intervals along the circumferential direction of the guide connecting pipe, the inner wall of each second righting rib is an arc surface, and the diameter of a second circular through hole formed by the inner walls of the second righting ribs is larger than that of the solid plunger.

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