CN211314172U - Hollow pumping aid - Google Patents
Hollow pumping aid Download PDFInfo
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- CN211314172U CN211314172U CN201921591957.2U CN201921591957U CN211314172U CN 211314172 U CN211314172 U CN 211314172U CN 201921591957 U CN201921591957 U CN 201921591957U CN 211314172 U CN211314172 U CN 211314172U
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Abstract
The utility model discloses a hollow helps takes out ware, include: a core tube as a base tube; further comprising: the pumping-assisting body is sleeved outside the core pipe, and the outer wall of the middle section of the core pipe is radially reduced in diameter, so that an annular space is formed between the outer wall of the core pipe and the inner wall of the pumping-assisting body; the pumping-assisting body is provided with a liquid discharge hole which is communicated in the radial direction. The utility model discloses help the oil-well pump to pump oil, improve the pump efficiency, reduce plunger upper end pressure differential, improve the life-span.
Description
Technical Field
The utility model belongs to the technical field of the oil production equipment technique and specifically relates to a hollow helps takes out ware.
Background
The low-permeability reservoir is a main yield position of a victory oil field, but the main lifting process at present is that a conventional machine rod pump (1) is deep in pumping and low in submergence, so that the pumping efficiency is low; (2) the low-permeability oil reservoir generally contains gas (10-280m3/m3), and the high gas-liquid ratio causes the pumping efficiency of an oil well pump to be greatly reduced;
the early research forms a sucker-rod pump effect-lifting device of a deep pumping well and an oil extraction device ZL201720603718.9 using the sucker-rod pump effect-lifting device, and the technology adopts a core tube, an outer cylinder and a coupling, so that the structure is simpler, and the application of a straight inclined well is met; the oil well pumping aid ZL94247199.7 has a valve ball and a valve seat in the pumping aid, and has good sealing performance.
However, these pumping aids cannot be applied to oil wells with severe wax deposition, and these wells need to be electrically heated and mixed with hot water to reduce viscosity, but the rod-type graded pumping aids have no channel inside and cannot meet the requirements at present.
Application No.: 201610327641.7, filing date: 2016-05-17 auxiliary oil pumping synergist comprises a core rod, a centering sleeve sleeved on the core rod, and a ring valve arranged on the core rod, wherein the ring valve is positioned below the centering sleeve, a limiting part is arranged above the centering sleeve, the centering sleeve is movably arranged between the limiting part and the ring valve, an oil guide channel is arranged between the outer wall of the core rod and the inner wall of the centering sleeve, the centering sleeve comprises a body and a first closed male head arranged at the lower end of the body, a closed female head is arranged on the ring valve, and the first closed male head is matched with the closed female head. Compared with the prior art, the auxiliary oil pumping synergist provided by the invention has the following advantages: the invention has simple structure, few parts and convenient assembly, can effectively reduce the abrasion between the sucker rod and the oil pipe, can realize the pumping assistance of well fluid and improve the pump efficiency of the oil well pump.
Application No.: 201410664625.8, filing date: 2014-11-19 discloses a pumping aid for an oil well pump. The pumping aid comprises: the screen pipe is used for filtering oil well output liquid; the liquid inlet cylinder comprises an upper section, a middle section and a lower section, and the lower section of the liquid inlet cylinder is connected with the upper end of the sieve tube; the rotary mixer is arranged in the liquid inlet cylinder and comprises a rotating shaft and blades arranged on the rotating shaft; the upper end of the oil pipe is connected with a pump seat of the oil well pump, and the lower end of the oil pipe is connected with the upper section of the liquid inlet cylinder; the flow velocity changing device is arranged in the oil pipe and comprises at least one stage of flow velocity transmitter; the ejector is arranged at the top end of the oil pipe and is positioned in the pump seat; the ejector comprises an ejection cylinder and a spiral plate arranged on the outer side of the ejection cylinder. The invention can improve the instantaneous linear velocity of the produced liquid of the oil well without electricity under the premise of unchanged stratum pressure and liquid supply capacity, so that the pressure energy of the produced liquid can be changed into energy, the liquid flow velocity is accelerated, the liquid flow state is changed, the filling factor of a pump is improved, and the yield is increased.
Application No.: 201210395953.3, filing date: 2012-10-18 relates to a centralizer for a sucker rod. The pumping-assisted centralizer of the sucker rod comprises a central rod, and a centralizing body cylinder is sleeved outside the central rod. After the invention is installed in the sucker rod string, the eccentric wear of the sucker rod, the oil pumping pipe and the oil well pump can be effectively reduced, and the invention can play an obvious pumping-assisting role, thereby improving the pump efficiency and prolonging the service life of the whole underground oil pumping equipment. In addition, the invention has simple structure, reliable work and wider application prospect.
Application No.: 201120207240.0, filing date: 2011-06-20A liquid-increasing pumping-aid device for oil-extracting well in oil field is composed of central rod, upper centralizing body, core tube, sealing sleeve, wear-reducing main body, lower centralizing body and locking nut. The sliding seal assembly consisting of the core pipe, the seal sleeve and the antifriction main body is sleeved on the central rod and can freely slide. The liquid increasing pumping aid is arranged on the sucker rod string, can isolate stratum output liquid in a tubing string on the upper part of an oil well pump into a plurality of sections, and lifts the stratum output liquid to a well mouth by utilizing the power of the sucker rod string, thereby playing the roles of reducing the outlet pressure of the oil well pump and assisting in lifting. The liquid increasing pumping aid adopts an elastic steel body antifriction mechanism, is sand-resistant and wear-resistant, and can effectively prolong the service life of the oil well pump.
Application No.: 200620003610.8, filing date: 2006-02-10 can realize plastic friction between a centralizing slide block and the inner diameter of an oil pipe, avoid hard abrasion between pipe rods in an inclined shaft section, prolong the service life of the pipe rods and prolong the effective production time of an oil well. The righting slide block moves up and down within a limited length range, under the action of liquid column pressure and liquid column lifting force, the action of the righting slide block enables liquid to flow in the passage male buckle connector and the section hoop passage body cavity, the moving valve in the section hoop passage body cavity and the moving valve on the pump piston are synchronously switched on to operate, the pressure field of a liquid column in an oil pipe is changed, the pressure of the liquid column on the piston is reduced, the oil pipe thread is screwed, the leakage between the valve of the pump, the piston and a pump cylinder is reduced, the pump efficiency is improved, and the oil pumping assisting effect is good. The worn righting slide block can be replaced during workover operation, so that the assembly does not need to be replaced any more in a labor-saving and time-saving manner, the cost is reduced, and the economic benefit is improved.
Technical scheme and the technical problem that will solve and the beneficial effect who produces of above disclosure technique all with the utility model discloses inequality, to the utility model discloses more technical characteristics and the technical problem and the beneficial effect that will solve all do not have the technological inspiration in the above technical document that discloses.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hollow helps takes out ware can improve pump efficiency and life to solve the problem that exists among the prior art.
In order to achieve the above object, the present invention adopts the following technical solution, a hollow pumping aid, comprising:
a core tube as a base tube;
further comprising:
the pumping-assisting body is sleeved outside the core pipe, and the outer wall of the middle section of the core pipe is radially reduced in diameter, so that an annular space is formed between the outer wall of the core pipe and the inner wall of the pumping-assisting body; the pumping-assisting body is provided with a liquid discharge hole which is communicated in the radial direction.
Further, still include:
the hollow rod coupling is connected to the external thread of the upper port of the core pipe in a thread-buckling mode.
Furthermore, a small-end outer boss is arranged on the outer wall of the core pipe and close to the upper port of the core pipe, the outer diameter of the small-end outer boss is the same as the inner diameter of the pumping assisting body, namely, the inner wall of the upper port of the pumping assisting body is in axial sliding connection with the outer wall of the small-end outer boss, and meanwhile, the outer diameter of the small-end outer boss is smaller than the outer diameter of the lower port of the hollow rod coupling.
Furthermore, a large-end outer boss is arranged on the outer wall of the core tube and close to the lower end opening of the core tube, and the outer diameter of the large-end outer boss is larger than the inner diameter of the pumping-assisting body, namely the lower end opening of the pumping-assisting body is axially limited by the large-end outer boss.
Further, the upper end of the annular space is transited to the small-end outer boss through a smooth transition surface.
Further, the lower end of the annular space is transited to the large-end outer boss through a smooth transition surface.
Furthermore, the pumping-assisting body is a sleeve, and when the lower end of the pumping-assisting body is abutted against the large-end outer boss, the axial distance from the upper end face of the pumping-assisting body to the lower end face of the hollow rod coupling is 15-18 mm.
Furthermore, when the lower end of the pumping-assisting body is abutted against the large-end outer boss, the upper part of the liquid discharge hole of the pumping-assisting body is higher than the lower edge of the small-end outer boss of the core pipe.
Furthermore, 3-4 liquid discharge holes are uniformly distributed on the pumping-aid body, and the length of each liquid discharge hole is 40-55 mm.
Furthermore, a sealing ring is further arranged at the connection position of the internal thread of the hollow rod coupling and the external thread at the upper end of the core pipe.
Further, the outer wall of the lower end of the core pipe is provided with core pipe lower external threads.
Compared with the prior art, the utility model following beneficial effect has:
1. the oil well pump is beneficial to pumping oil, the pump efficiency is improved, the pressure difference at the upper end of the plunger is reduced, and the service life is prolonged;
because the piston effect who imitates the device is carried, when the sucker rod subassembly sets up a plurality of deep pumping well sucker rod pumps along axial direction and carries the effect device, deep pumping well sucker rod pump carries the effect device promptly the utility model discloses, can share most pressure differential about the plunger by a plurality of effect devices of carrying, reduced the pressure differential on plunger top greatly to the leakage loss and the rate of wear between plunger and pump barrel have been reduced greatly, have improved the pump efficiency, have reduced wearing and tearing. The oil well pump can work normally even under the condition that the plunger is abraded greatly, so that the actual working life of the oil well pump is prolonged.
2. The sucker rod is righted, and the friction between the sucker rod and the oil pumping pipe is reduced;
the effect device is imitated in the improvement of access reasonable quantity, can reach fine sucker rod and right the effect, alleviates the friction between sucker rod and oil pipe, improves the running life, and design strength is greater than the sucker rod, and is little to the fault rate influence.
3. The service life of the whole underground oil pumping equipment is prolonged.
Drawings
Fig. 1 is a schematic structural view of the hollow pumping aid of the present invention.
In the figure: the hollow rod coupling 1, the core pipe 2, the sealing ring 3, the pumping-assisting body 4 and the liquid discharge hole 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
referring to fig. 1, the present invention provides a technical solution: a hollow extraction aid, comprising:
a core tube 2 as a base tube;
further comprising:
the pumping-assisting body 4 is sleeved outside the core pipe, and the outer wall of the middle section of the core pipe is radially reduced in diameter, so that an annular space is formed between the outer wall of the core pipe and the inner wall of the pumping-assisting body;
the pumping-assisting body is provided with a liquid discharge hole 5 which is through in the radial direction.
Further comprising:
the hollow rod coupling 1 is connected to the external thread of the upper port of the core pipe in a thread-buckling mode.
The outer wall of the core pipe is provided with a small-end outer boss close to the upper port of the core pipe, the outer diameter of the small-end outer boss is the same as the inner diameter of the pumping assisting body, namely, the inner wall of the upper port of the pumping assisting body is connected with the outer wall of the small-end outer boss in an axial sliding mode, and meanwhile, the outer diameter of the small-end outer boss is smaller than the outer diameter of the lower port of the hollow rod coupling.
The outer wall of the core pipe and the position close to the lower end opening of the core pipe are provided with a large-end outer boss, the outer diameter of the large-end outer boss is larger than the inner diameter of the pumping-assisting body, and the lower end opening of the pumping-assisting body is axially limited by the large-end outer boss.
The upper end of the annular space is transited to the small-end outer boss through a smooth transition surface.
The lower end of the annular space is transited to the large-end outer boss through a smooth transition surface.
The pumping-assisting body is a sleeve, and when the lower end of the pumping-assisting body is abutted against the large-end outer boss, the axial distance from the upper end face of the pumping-assisting body to the lower end face of the hollow rod coupling is 15-18 mm.
When the lower end of the pumping-assisting body is abutted against the large-end outer boss, the upper part of a liquid discharge hole of the pumping-assisting body is higher than the lower edge of the small-end outer boss of the core pipe.
3-4 liquid discharge holes are uniformly distributed on the pumping-aid body, and the length of each liquid discharge hole is 40-55 mm.
And a sealing ring is further arranged at the joint of the internal thread of the hollow rod coupling and the external thread at the upper end of the core pipe.
And the outer wall of the lower end of the core pipe is provided with core pipe lower external threads.
The large outer diameter end 2-2 of the core tube 2 is positioned at the lower part, one end of a liquid discharge hole of the pumping-aid body 4 is upward and penetrates through the core tube 2, a sealing ring 3 is sleeved in an o-shaped groove at the small end 2-1 of the core tube 2, and a hollow coupling 1 is connected with a thread at one end sleeved with the sealing ring;
the core pipe 2 is of a hollow structure, the inner diameter of the core pipe is consistent with that of a hollow rod to be connected, the upper thread and the lower thread of the core pipe 2 are hollow rod threads, and the outer diameter of the large end 2-2 at the lower part of the core pipe is larger than that of the small end 2-1; the outer diameter of the middle part is 1-2mm larger than that of the connecting hollow rod; the two ends and the middle part are in smooth transition without stress concentration;
the inner diameter of the pumping-aid body 4 is smaller than the outer diameters of the large end part 2-2 of the core tube 2 and the hollow coupling 1 and is slightly larger than the small end part 2-1 of the core tube 2, 3-4 liquid drainage holes which penetrate through the pumping-aid body 4 are arranged on the pumping-aid body 4, and the length of each liquid drainage hole is 40mm-55 mm; the outer wall of the lower end of the pumping-assisting body is in arc transition 4-1, and the outer wall of the upper end of the pumping-assisting body is also in arc transition.
When the assembled hollow pumping aid is vertically placed, the upper part of a liquid discharge hole of the pumping aid body 4 is slightly higher than the lower edge of the small end of the core pipe 2;
the distance between the assembled pumping-assisting body 4 and the hollow rod coupling 1 is preferably 15-18 mm;
when the hollow pumping aid goes into the well, the male buckle end is kept to be lower, and the female buckle end is kept to be upper.
When the pumping unit goes upward, the pumping-aid body 4 is seated on the outer boss at the lower end of the core pipe and is matched with the outer boss to form a seal, so that the liquid at the upper part of the pumping-aid device is lifted; the liquid on the upper part of the pumping aid flows downwards through the gap between the pumping aid body and the oil pipe.
When the pumping unit descends, the pumping aid body 4 moves upwards and props against the lower part of the coupling by the friction force between the pumping aid body 4 and the oil pipe, and most of the fluid flows between the pumping aid body 4 and the core pipe 2 and then flows through the liquid discharge hole 5.
Example 2:
referring to fig. 1, the present invention provides a technical solution: a hollow extraction aid, comprising:
a core tube 2 as a base tube;
further comprising:
the pumping-assisting body 4 is sleeved outside the core pipe, and the outer wall of the middle section of the core pipe is radially reduced in diameter, so that an annular space is formed between the outer wall of the core pipe and the inner wall of the pumping-assisting body;
the pumping-assisting body is provided with a liquid discharge hole 5 which is through in the radial direction.
Further comprising:
the hollow rod coupling 1 is connected to the external thread of the upper port of the core pipe in a thread-buckling mode.
The outer wall of the core pipe is provided with a small-end outer boss close to the upper port of the core pipe, the outer diameter of the small-end outer boss is the same as the inner diameter of the pumping assisting body, namely, the inner wall of the upper port of the pumping assisting body is connected with the outer wall of the small-end outer boss in an axial sliding mode, and meanwhile, the outer diameter of the small-end outer boss is smaller than the outer diameter of the lower port of the hollow rod coupling.
The outer wall of the core pipe and the position close to the lower end opening of the core pipe are provided with a large-end outer boss, the outer diameter of the large-end outer boss is larger than the inner diameter of the pumping-assisting body, and the lower end opening of the pumping-assisting body is axially limited by the large-end outer boss.
The upper end of the annular space is transited to the small-end outer boss through a smooth transition surface.
The lower end of the annular space is transited to the large-end outer boss through a smooth transition surface.
The pumping-assisting body is a sleeve, and when the lower end of the pumping-assisting body is abutted against the large-end outer boss, the axial distance from the upper end face of the pumping-assisting body to the lower end face of the hollow rod coupling is 15-18 mm.
When the lower end of the pumping-assisting body is abutted against the large-end outer boss, the upper part of a liquid discharge hole of the pumping-assisting body is higher than the lower edge of the small-end outer boss of the core pipe.
3-4 liquid discharge holes are uniformly distributed on the pumping-aid body, and the length of each liquid discharge hole is 40-55 mm.
Example 3:
referring to fig. 1, the present invention provides a technical solution: a hollow extraction aid, comprising:
a core tube 2 as a base tube;
further comprising:
the pumping-assisting body 4 is sleeved outside the core pipe, and the outer wall of the middle section of the core pipe is radially reduced in diameter, so that an annular space is formed between the outer wall of the core pipe and the inner wall of the pumping-assisting body;
the pumping-assisting body is provided with a liquid discharge hole 5 which is through in the radial direction.
Further comprising:
the hollow rod coupling 1 is connected to the external thread of the upper port of the core pipe in a thread-buckling mode.
The outer wall of the core pipe is provided with a small-end outer boss close to the upper port of the core pipe, the outer diameter of the small-end outer boss is the same as the inner diameter of the pumping assisting body, namely, the inner wall of the upper port of the pumping assisting body is connected with the outer wall of the small-end outer boss in an axial sliding mode, and meanwhile, the outer diameter of the small-end outer boss is smaller than the outer diameter of the lower port of the hollow rod coupling.
The outer wall of the core pipe and the position close to the lower end opening of the core pipe are provided with a large-end outer boss, the outer diameter of the large-end outer boss is larger than the inner diameter of the pumping-assisting body, and the lower end opening of the pumping-assisting body is axially limited by the large-end outer boss.
The upper end of the annular space is transited to the small-end outer boss through a smooth transition surface.
The lower end of the annular space is transited to the large-end outer boss through a smooth transition surface.
The pumping-assisting body is a sleeve, and when the lower end of the pumping-assisting body is abutted against the large-end outer boss, the axial distance from the upper end face of the pumping-assisting body to the lower end face of the hollow rod coupling is 15-18 mm.
When the lower end of the pumping-assisting body is abutted against the large-end outer boss, the upper part of a liquid discharge hole of the pumping-assisting body is higher than the lower edge of the small-end outer boss of the core pipe.
Example 4:
referring to fig. 1, the present invention provides a technical solution: a hollow extraction aid, comprising:
a core tube 2 as a base tube;
further comprising:
the pumping-assisting body 4 is sleeved outside the core pipe, and the outer wall of the middle section of the core pipe is radially reduced in diameter, so that an annular space is formed between the outer wall of the core pipe and the inner wall of the pumping-assisting body;
the pumping-assisting body is provided with a liquid discharge hole 5 which is through in the radial direction.
Further comprising:
the hollow rod coupling 1 is connected to the external thread of the upper port of the core pipe in a thread-buckling mode.
The outer wall of the core pipe is provided with a small-end outer boss close to the upper port of the core pipe, the outer diameter of the small-end outer boss is the same as the inner diameter of the pumping assisting body, namely, the inner wall of the upper port of the pumping assisting body is connected with the outer wall of the small-end outer boss in an axial sliding mode, and meanwhile, the outer diameter of the small-end outer boss is smaller than the outer diameter of the lower port of the hollow rod coupling.
The outer wall of the core pipe and the position close to the lower end opening of the core pipe are provided with a large-end outer boss, the outer diameter of the large-end outer boss is larger than the inner diameter of the pumping-assisting body, and the lower end opening of the pumping-assisting body is axially limited by the large-end outer boss.
The upper end of the annular space is transited to the small-end outer boss through a smooth transition surface.
The lower end of the annular space is transited to the large-end outer boss through a smooth transition surface.
Example 5:
referring to fig. 1, the present invention provides a technical solution: a hollow extraction aid, comprising:
a core tube 2 as a base tube;
further comprising:
the pumping-assisting body 4 is sleeved outside the core pipe, and the outer wall of the middle section of the core pipe is radially reduced in diameter, so that an annular space is formed between the outer wall of the core pipe and the inner wall of the pumping-assisting body;
the pumping-assisting body is provided with a liquid discharge hole 5 which is through in the radial direction.
Further comprising:
the hollow rod coupling 1 is connected to the external thread of the upper port of the core pipe in a thread-buckling mode.
The outer wall of the core pipe is provided with a small-end outer boss close to the upper port of the core pipe, the outer diameter of the small-end outer boss is the same as the inner diameter of the pumping assisting body, namely, the inner wall of the upper port of the pumping assisting body is connected with the outer wall of the small-end outer boss in an axial sliding mode, and meanwhile, the outer diameter of the small-end outer boss is smaller than the outer diameter of the lower port of the hollow rod coupling.
The outer wall of the core pipe and the position close to the lower end opening of the core pipe are provided with a large-end outer boss, the outer diameter of the large-end outer boss is larger than the inner diameter of the pumping-assisting body, and the lower end opening of the pumping-assisting body is axially limited by the large-end outer boss.
In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A hollow extraction aid, comprising:
a core tube as a base tube;
it is characterized by also comprising:
the pumping-assisting body is sleeved outside the core pipe, and the outer wall of the middle section of the core pipe is radially reduced in diameter, so that an annular space is formed between the outer wall of the core pipe and the inner wall of the pumping-assisting body; the pumping-assisting body is provided with a liquid discharge hole which is communicated in the radial direction.
2. The hollow extraction aid of claim 1, further comprising:
the hollow rod coupling is connected to the external thread of the upper port of the core pipe in a thread-buckling mode.
3. The hollow pumping aid according to claim 2, wherein the outer wall of the core tube is provided with a small-end outer boss at a position close to the upper port of the core tube, the outer diameter of the small-end outer boss is the same as the inner diameter of the pumping aid body, namely, the inner wall of the upper port of the pumping aid body is axially slidably connected with the outer wall of the small-end outer boss, and the outer diameter of the small-end outer boss is smaller than the outer diameter of the lower port of the hollow rod coupling.
4. The hollow extraction aid according to claim 2 or 3, wherein a large-end outer boss is arranged on the outer wall of the core tube and close to the lower port of the core tube, and the outer diameter of the large-end outer boss is larger than the inner diameter of the extraction aid body, namely the lower port of the extraction aid body is axially limited by the large-end outer boss.
5. A hollow pumping aid according to claim 3, wherein the upper end of the annular space transitions to the small end outer boss with a rounded transition surface.
6. A hollow pumping aid according to claim 3, wherein the lower end of the annular space transitions to a large end external boss with a rounded transition surface.
7. A hollow pumping aid according to claim 3, 5 or 6, wherein the pumping aid is a sleeve, and the axial distance from the upper end face of the pumping aid to the lower end face of the hollow rod coupling is 15-18mm when the lower end of the pumping aid abuts against the large-end outer boss.
8. The hollow pumping aid according to claim 3, 5 or 6, wherein when the lower end of the pumping aid body abuts against the large-end outer boss, the upper part of the liquid discharge hole of the pumping aid body is higher than the lower edge of the small-end outer boss of the core tube.
9. The hollow pumping aid according to claim 3, 5 or 6, wherein 3-4 drainage holes are uniformly distributed on the pumping aid body, and the length of each drainage hole is 40-55 mm.
10. The hollow pumping aid according to claim 2, 3, 5 or 6, wherein a sealing ring is further installed at the connection position of the internal thread of the hollow rod coupling and the external thread at the upper end of the core tube.
11. The hollow pumping aid according to claim 2, 3, 5 or 6, wherein the outer wall of the lower end of the core tube is provided with lower core tube external threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921591957.2U CN211314172U (en) | 2019-09-23 | 2019-09-23 | Hollow pumping aid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921591957.2U CN211314172U (en) | 2019-09-23 | 2019-09-23 | Hollow pumping aid |
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| CN211314172U true CN211314172U (en) | 2020-08-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790041A (en) * | 2021-09-17 | 2021-12-14 | 江天科技有限公司 | Multifunctional pumping aid with righting function |
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2019
- 2019-09-23 CN CN201921591957.2U patent/CN211314172U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790041A (en) * | 2021-09-17 | 2021-12-14 | 江天科技有限公司 | Multifunctional pumping aid with righting function |
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