CN208830921U - The locking tool of plunger - Google Patents
The locking tool of plunger Download PDFInfo
- Publication number
- CN208830921U CN208830921U CN201821169972.3U CN201821169972U CN208830921U CN 208830921 U CN208830921 U CN 208830921U CN 201821169972 U CN201821169972 U CN 201821169972U CN 208830921 U CN208830921 U CN 208830921U
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- claw
- pipe nipple
- bottom end
- circlip
- oil pipe
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Abstract
The utility model discloses a kind of locking tools of plunger, belong to oil gas field apparatus field.The tool includes: that sequentially connected pulling head, spiral pipe nipple, exhaust pipe nipple and fixing piece, fixing piece are fixed in oil pipe from top to bottom.Exhaust pipe nipple is hollow cylindrical configuration, and the side wall for being vented pipe nipple is provided with venthole, and the hollow space for being vented pipe nipple is connected to by venthole with the first annular space being vented between pipe nipple and oil pipe；Spiral pipe nipple separates the second annular space between first annular space and pulling head and oil pipe, and the groove of helical structure is provided on the outer wall of spiral pipe nipple, and the bottom end of groove is connected to first annular space, and top is connected to the second annular space.The utility model is fixed in oil pipe and realizes to the locking of plunger, and first annular space and the second annular space are connected to by setting spiral pipe nipple, output air-flow becomes spiral up draft after groove, improves the motive force of gas, and then improve the efficiency of plunger lift draining.
Description
Technical field
The utility model relates to oil gas field apparatus field, in particular to a kind of locking tool of plunger.
Background technique
During gas field development, the output gas in gas well is produced through oil pipe to well head.It is miscellaneous containing vapor etc. in output gas
Matter, in gas production process, vapor condenses deposition in oil pipe, forms oil pipe ponding, influences gas well liquid loading efficiency.
The prior art solves the problems, such as oil pipe ponding by following manner: will be in plunger tripping in oil pipe and positioned at oil pipe ponding
Lower section, output gas push plunger to move up, oil pipe ponding are taken out of to well head.By tripping in plunger repeatedly and by plunger lift to well
Mouthful, it can solve oil pipe ponding problem.When tripping in plunger, in order to avoid plunger falls to downwards shaft bottom, it is necessary in oil pipe
Predeterminated position locking tool is set plunger is limited.
Utility model content
The utility model embodiment provides a kind of locking tool of plunger, can solve above-mentioned technical problem.Particular technique side
Case is as follows:
A kind of locking tool of plunger, the tool application is in oil pipe, comprising: from top to bottom sequentially connected pulling head,
Spiral pipe nipple, exhaust pipe nipple and fixing piece, the fixing piece are fixed in the oil pipe；
The exhaust pipe nipple is hollow cylindrical configuration, the hollow space of the exhaust pipe nipple and the institute below the fixing piece
The connection of oil pipe space is stated, the side wall of the exhaust pipe nipple is provided with venthole, and the hollow space of the exhaust pipe nipple passes through described
First annular space between venthole and the exhaust pipe nipple and the oil pipe is connected to；
The spiral pipe nipple is used to separate second between the first annular space and the pulling head and the oil pipe
Annular space is provided with the groove of helical structure, the bottom end of the groove and first ring on the outer wall of the spiral pipe nipple
The connection of shape space, top is connected to second annular space.
In a kind of possible design, the outer wall of the groove is provided with elastic sealing element.
In a kind of possible design, the elastic sealing element is the rubber material of water-swellable.
In a kind of possible design, the fixing piece includes: spreader cone, claw and limit circlip；
The spreader cone is hollow cylindrical configuration, and the top of the spreader cone is connect with the bottom end of the exhaust pipe nipple and institute
The hollow space for stating spreader cone is connected to the hollow space of the exhaust pipe nipple；
The claw section is sleeved on the spreader cone, and the bottom end of claw is located at the lower section of the spreader cone, described
Limit circlip is connected to the bottom end of the claw；
When the bottom end of claw described in the limit circlip clamping, the bottom end outer diameter of the claw is less than box cupling in the oil pipe
The internal diameter at place, when the limit circlip de-chucking, the bottom end outer diameter of the claw is greater than the internal diameter at the box cupling and is less than
The internal diameter of the oil pipe.
In a kind of possible design, the side wall of the spreader cone be provided with cone cell protrusion, the cone cell protrusion with it is described
The inner wall of claw contacts.
In a kind of possible design, the limit circlip includes: the first circlip and the second circlip, and first circlip connects
Connect the first side in the claw bottom end, second circlip is connected to second side of the claw bottom end, first side with
Described second side is opposite；
First circlip includes sequentially connected first linkage section, the first fastening portion and the first unfreezing section, and described first
Linkage section is connected to the first side of the claw bottom end by first rotating shaft；
Second circlip includes sequentially connected second linkage section, the second fastening portion and the second unfreezing section, and described second
Linkage section is connected to second side of the claw bottom end by the second shaft；
When claw described in the limit circlip clamping, first fastening portion is attached in second side of the claw bottom end,
Second fastening portion is tightly attached on the first side of the claw bottom end, and the first unfreezing section and the second unfreezing section energy
It is fashionable by the box cupling under, unfreezing under the action of box cupling when moving up.
In a kind of possible design, the bottom end of the claw is provided with locking teeth, the locking teeth include fixed part and
Card-tight part, the top of the card-tight part is connect with the bottom end of the fixed part and the outer diameter of the fixed part is greater than the card-tight part
Outer diameter；
The fixed part is for being fixed on the box cupling, the card-tight part and first fastening portion and second card
Tight section contact.
In a kind of possible design, bolster is connected between the spiral pipe nipple and the exhaust pipe nipple.
In a kind of possible design, the pulling head are connect with the spiral short-section thread, and the pulling head and institute
It states and is limited between spiral pipe nipple by anti-turn screw.
Technical solution bring beneficial effect provided by the embodiment of the utility model includes at least:
The locking tool of plunger provided by the embodiment of the utility model is fixed in oil pipe by fixing piece and is realized to plunger
It is locking, and by between the setting spiral pipe nipple first annular space being connected between exhaust pipe nipple and oil pipe and pulling head and oil pipe
The second annular space, output air-flow becomes spiral up draft after groove, improves the motive force of gas, and then improve plunger
The efficiency of gaslift draining.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the top half structural schematic diagram of the locking tool of plunger provided by the embodiment of the utility model；
Fig. 2 is the lower half portion structural schematic diagram of the locking tool of plunger provided by the embodiment of the utility model；
Fig. 3 is the partial enlarged view of claw bottom end in the locking tool of plunger provided by the embodiment of the utility model.
Appended drawing reference respectively indicates:
1- pulling head,
2- spiral pipe nipple,
21- groove,
3- is vented pipe nipple,
31- venthole,
4- fixing piece,
41- spreader cone,
411- cone cell protrusion,
42- claw,
43- limits circlip,
The first circlip of 431-,
The first linkage section of 4311-,
The first fastening portion of 4312-,
4313- the first unfreezing section,
The second circlip of 432-,
The second linkage section of 4321-,
The second fastening portion of 4322-,
4323- the second unfreezing section,
5- elastic sealing element,
6- first rotating shaft,
The second shaft of 7-,
8- locking teeth,
81- fixed part,
82- card-tight part,
9- bolster,
10- anti-turn screw.
Specific embodiment
Unless otherwise defined, all technical terms used in the utility model embodiment all have and those skilled in the art
Normally understood identical meaning.To keep the purpose of this utility model, technical solution and advantage clearer, below in conjunction with attached
Figure is described in further detail the utility model embodiment.
The utility model embodiment provides a kind of locking tool of plunger, and the tool application is in oil pipe, such as attached drawing 1 and attached
Shown in Fig. 2, which includes: sequentially connected pulling head 1, spiral pipe nipple 2, exhaust pipe nipple 3 and fixing piece 4 from top to bottom, Gu
Determine part 4 to be fixed in oil pipe；
Exhaust pipe nipple 3 is hollow cylindrical configuration, and the oil pipe space for being vented 4 lower section of hollow space and fixing piece of pipe nipple 3 connects
Logical, the side wall of exhaust pipe nipple 3 is provided with venthole 31, and the hollow cylindrical configuration of exhaust pipe nipple 3 is short by venthole 31 and exhaust
First annular space connection between section 3 and oil pipe；
Spiral pipe nipple 2 is used to separate the second annular space between first annular space and pulling head 1 and oil pipe, and spiral is short
The groove 21 of helical structure is provided on the outer wall of section 2, the bottom end of groove 21 is connected to first annular space, top and the second ring
The connection of shape space.
The working principle of the locking tool of plunger provided by the embodiment of the utility model is illustrated below:
In application, pulling head 1 are connected on pulling and running tool, by pulling and running tool by the locking tool tripping in oil pipe of the plunger
In.After being lowered into predeterminated position, fixing piece 4 is fixed in oil pipe, and then the locking tool of the plunger is fixed in oil pipe.Output
Gas flows up into exhaust pipe nipple 3, flows out through the venthole 31 on exhaust 3 side wall of pipe nipple, into exhaust pipe nipple 3 and oil pipe
Between first annular space, subsequently into becoming spiral up draft during in the groove 21 of helical structure, flowing up
Into in the second annular space between pulling head 1 and oil pipe.When carrying out plunger lift, the plunger of tripping in oil pipe falls within pulling
On first 1, spiralling output air-flow drives plunger to move up.Flow velocity becomes after output gas enters in the groove 21 of helical structure
Fastly, pressure becomes larger, and flow direction becomes spiral, and gas push power improves, and has more when pushing plunger to move up
Good impact effect further increases the efficiency of plunger lift draining.
As it can be seen that the locking tool of plunger provided by the embodiment of the utility model is fixed on realization pair in oil pipe by fixing piece 4
Plunger it is locking, and by be arranged spiral pipe nipple 2 be connected to first annular space and the second annular space, output air-flow is through groove 21
After become spiral up draft, improve the motive force of gas, and then improve the efficiency of plunger lift draining.
In order to change fluid state of the output gas in spiral grooves 21 more thoroughly, as shown in Fig. 1, outside groove 21
Wall is provided with elastic sealing element 5.In the locking tool tripping in Tubing During Running of plunger, the outer diameter of elastic sealing element 5 is less than oil pipe
Outer diameter enables the locking tool normally casing into of plunger.After the locking tool of plunger is fixed, elastic sealing element 5 and oil pipe are in close contact,
It flow up output gas can only through groove 21, the fluid state of output gas changed more thoroughly.
It not being contacted with oil pipe for how to realize that elastic sealing element 5 is fashionable under, being in close contact to be formed with oil pipe after tripping in
Sealing, is illustrated below: elastic sealing element 5 is the rubber material of water-swellable.So set, elastic sealing element 5
Original outer diameter is less than the internal diameter of oil pipe, and elastic sealing element 5 gradually expands after the locking tool of plunger is fixed in oil pipe, tight with oil pipe
Contiguity touching forms sealing.
In the utility model embodiment, fixing piece 4 is fixed in oil pipe and then the locking tool of plunger is fixed in oil pipe,
For the structure of fixing piece 4, illustrated below:
As shown in Fig. 2, fixing piece 4 includes: spreader cone 41, claw 42 and limit circlip 43.Spreader cone 41 is hollow
Shape structure, and the top of spreader cone 41 is connect with the bottom end of exhaust pipe nipple 3；42 part of claw is sleeved on spreader cone 41, bottom end
Positioned at the lower section of spreader cone 41, the bottom end that circlip 43 is connected to claw 42 is limited；When limiting the bottom end of 43 clamping claw 42 of circlip,
The bottom end outer diameter of claw 42 is less than the internal diameter in oil pipe at box cupling, when limiting 43 de-chucking of circlip, the bottom end outer diameter of claw 42
Greater than the internal diameter at box cupling and less than the internal diameter of oil pipe.
It is understood that oil pipe is formed by connecting by multistage oil pipe pipe nipple, connected between adjacent pipe nipple by box cupling.Box cupling
The internal diameter at place is less than the diameter of tubing nipple, and above-mentioned pipe aperture refers to the internal diameter of tubing nipple.
When the locking tool of the tripping in plunger, the bottom end of 43 clamping claw 42 of circlip is limited, keeps the bottom end of claw 42 suitable
Benefit passes through predeterminated position of the tubing coupling tripping in into oil pipe.Then clamping of the limit circlip 43 to claw 42, claw 42 are released
The internal diameter that the diameter of bottom end is greater than box cupling is less than the internal diameter of oil pipe, and 42 bottom end of claw is fixed on box cupling, completes to fix.
42 part of claw is sleeved on spreader cone 41, and spreader cone 41 plays a part of to connect and struts claw 42, makes claw 42
Bottom diameter under no gripping orientation is greater than the internal diameter of box cupling.In order to enable spreader cone 41 to strut claw 42, spreader cone 41
Side wall be provided with cone cell protrusion 411, cone cell protrusion 411 is contacted with the inner wall of claw 42.
So set, cone cell protrusion 411 contacts and is located at the lower section on 42 top of claw with the inner wall of claw 42, to claw 42
Serve and strut, the bottom diameter of claw 42 is made to meet expected use demand.
How clamping and can after predeterminated position in being lowered into oil pipe is carried out to 42 bottom end of claw for limit circlip 43
De-chucking below illustrates the structure of limit circlip 43:
As shown in Fig. 3, limit circlip 43 includes: the first circlip 431 and the second circlip 432, and the first circlip 431 is connected to
First side of 42 bottom end of claw, the second circlip 432 are connected to second side of 42 bottom end of claw, and the first side is opposite with second side；The
One circlip 431 includes sequentially connected first linkage section 4311, the first fastening portion 4312 and the first unfreezing section 4313, the first connection
Section 4311 is connected to the first side of 42 bottom end of claw by first rotating shaft 6；Second circlip 432 includes sequentially connected second connection
The 4321, second fastening portion 4322 of section and the second unfreezing section 4323, the second linkage section 4321 are connected to claw 42 by the second shaft 7
Second side of bottom end.When limiting 43 clamping claw 42 of circlip, the first fastening portion 4312 is attached in second side of 42 bottom end of claw, the
Two fastening portions 4322 are tightly attached on the first side of 42 bottom end of claw, and the first unfreezing section 4313 and the second unfreezing section 4323 can be under
It is fashionable by box cupling, unfreezing under the action of box cupling when moving up.
Before tripping in, the first fastening portion 4312 is attached in second side of 42 bottom end of claw, the second fastening portion 4322 is attached to card
On first side of 42 bottom end of pawl, the first fastening portion 4312 and the second fastening portion 4322 are generated on 42 bottom end of claw and are directed radially towards
The power in center of circle direction shrinks 42 bottom end of claw.Unfreezing section (including the first unfreezing section 4313 and second unfreezing section 4323) at this time
Outer diameter be greater than the internal diameter of box cupling, and the outer diameter of unfreezing section is gradually reduced from top to bottom.When oil pipe passes downwardly through box cupling, unfreezing section
It is shunk under the action of the power of box cupling, box cupling can be passed through.When the locking tool of plunger is lowered into predeterminated position, it is locking above to mention plunger
Tool, when unfreezing section touches box cupling, unfreezing section moves downward under the action of box cupling, drives the first fastening portion 4312 and second
Fastening portion 4322 is detached from from the side wall of pulling claw bottom end, 42 de-chucking of claw.42 bottom end outer diameter of claw is greater than box cupling internal diameter at this time
And it is less than pipe aperture, when the continuation locking tool of tripping in plunger to 42 bottom end of claw and next box cupling contact, 42 bottom end of claw is solid
It is scheduled on the box cupling.It unclamps pulling and running tool to rise by pulling and running tool, the decentralization and fixation procedure of the locking tool of plunger can be completed.
In order to keep limit circlip 43 and the contact of 42 bottom end of claw preferable, the bottom end of claw 42 is provided with locking teeth 8, locking
Tooth 8 includes fixed part 81 and card-tight part 82, and the top of card-tight part 82 is connect with the bottom end of fixed part 81 and the outer diameter of fixed part 81
Greater than the outer diameter of card-tight part 82；
For being fixed on box cupling, card-tight part 82 connects fixed part 81 with the first fastening portion 4312 and the second fastening portion 4322
Touching.
So set, the first fastening portion 4312 and the second fastening portion 4322 are tightly attached to the first side and of card-tight part 82 respectively
Two sides make the outer diameter of 42 bottom end of claw be less than the internal diameter of box cupling by the contraction of card-tight part 82.First fastening portion 4312 and second
When fastening portion 4322 is removed from the two sides of card-tight part 82, the outer diameter of locking teeth 8 is greater than the internal diameter of box cupling, and the bottom surface of locking teeth 8 is fallen
It realizes and fixes on box cupling.
After the locking tool of the plunger is fixed in oil pipe, when carrying out plunger lift, plunger is put into oil pipe, plunger is fallen into
Onto pulling head 1, impact force when in order to fall into plunger does not cause larger damage, 2 He of spiral pipe nipple to the locking tool of plunger
Bolster 9 is connected between exhaust pipe nipple 3.
By the way that bolster 9 is arranged, impact force when to investment plunger is buffered, and improves the stability of the locking tool of plunger
And physical life.
Wherein, bolster 9 can be the buffer spring for being connected to spiral pipe nipple 2 and being vented between pipe nipple 3.In order to avoid bullet
The bending of spring cannot keep spiral pipe nipple 2 and exhaust pipe nipple 3 coaxially, and the inner space of buffer spring can also be arranged with limit
Bar, buffer spring carry out vibrating up and down outside gag lever post, be not only able to maintain vertical state and have avoided bending, but also can play good buffering
Effect.
Pulling head 1 are connected on spiral pipe nipple 2, and illustratively, pulling head 1 are threadedly coupled with spiral pipe nipple 2, and pulling head 1
It is limited between spiral pipe nipple 2 by anti-turn screw 10.So set, being easily installed and dismantling, and pass through setting anti-rotation
Screw 10 is avoided connecting caused by pulling head 1 and the relative rotation of spiral pipe nipple 2 and not fastened, and stability and safety are higher.
Wherein, it after pulling head 1 are threadedly coupled with spiral pipe nipple 2, can radially be bored in pulling head 1 and spiral pipe nipple 2
Hole can obtain the through-hole of alignment in pulling head 1 and spiral pipe nipple 2, anti-turn screw 10 is inserted and secured in through-hole i.e.
It can.When needing to dismantle, anti-turn screw 10 is first taken out, can be dismantled pulling head 1 and spiral pipe nipple 2 by rotating.
1 one side of pulling head when removing with pulling and running tool for connecting, another aspect, also support column during the work time
Plug, pulling head 1 may include support section, gripping section and the linkage section formed from top to bottom, and linkage section and 2 screw thread of spiral pipe nipple connect
It connects.The diameter of gripping section is less than the diameter of support section, is clamped on gripping section convenient for pulling and running tool, and plunger is made to fall in support section
On pressure be uniformly distributed.
The foregoing is merely the illustrative embodiments of the utility model, the protection model that is not intended to limit the utility model
It encloses, within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of utility model.
Claims (9)
1. a kind of locking tool of plunger, which is characterized in that the tool application is in oil pipe, comprising: is sequentially connected with from top to bottom
Pulling head (1), spiral pipe nipple (2), exhaust pipe nipple (3) and fixing piece (4), the fixing piece (4) be fixed in the oil pipe；
The exhaust pipe nipple (3) is hollow cylindrical configuration, under the hollow space and the fixing piece (4) of exhaust pipe nipple (3)
The oil pipe space connection of side, the side wall of exhaust pipe nipple (3) are provided with venthole (31), exhaust pipe nipple (3)
Hollow space is connected to by the first annular space between the venthole (31) and exhaust pipe nipple (3) and the oil pipe；
The spiral pipe nipple (2) is used to separate the between the first annular space and the pulling head (1) and the oil pipe
Second ring space is provided with the groove (21) of helical structure, the bottom end of the groove (21) on the outer wall of the spiral pipe nipple (2)
It is connected to the first annular space, top is connected to second annular space.
2. tool according to claim 1, which is characterized in that the outer wall of the groove (21) is provided with elastic sealing element
(5)。
3. tool according to claim 2, which is characterized in that the elastic sealing element (5) is the rubber material of water-swellable
Matter.
4. tool according to claim 1, which is characterized in that the fixing piece (4) includes: spreader cone (41), claw
(42) and circlip (43) are limited；
The spreader cone (41) is hollow cylindrical configuration, the bottom end on the top of the spreader cone (41) and exhaust pipe nipple (3)
It connects and the hollow space of the spreader cone (41) is connected to the hollow space of exhaust pipe nipple (3)；
The claw (42) is partially sleeved on the spreader cone (41), and the bottom end of the claw (42) is located at the spreader cone
(41) lower section, limit circlip (43) are connected to the bottom end of the claw (42)；
When the bottom end of claw (42) described in described limit circlip (43) clamping, the bottom end outer diameter of the claw (42) is less than the oil
Internal diameter in pipe at box cupling, when limit circlip (43) de-chucking, the bottom end outer diameter of the claw (42) is greater than described connect
Internal diameter at hoop and the internal diameter less than the oil pipe.
5. tool according to claim 4, which is characterized in that the side wall of the spreader cone (41) is provided with cone cell protrusion
(411), the cone cell raised (411) is contacted with the inner wall of the claw (42).
6. tool according to claim 4, which is characterized in that the limit circlip (43) include: the first circlip (431) and
Second circlip (432), first circlip (431) are connected to the first side of the claw (42) bottom end, second circlip
(432) it is connected to second side of the claw (42) bottom end, first side is opposite with described second side；
First circlip (431) includes sequentially connected first linkage section (4311), the first fastening portion (4312) and the first solution
Card section (4313), first linkage section (4311) are connected to the first side of the claw (42) bottom end by first rotating shaft (6)；
Second circlip (432) includes sequentially connected second linkage section (4321), the second fastening portion (4322) and the second solution
Card section (4323), second linkage section (4321) are connected to second side of the claw (42) bottom end by the second shaft (7)；
When claw (42) described in limit circlip (43) clamping, first fastening portion (4312) is attached to the claw (42) bottom
In the second side at end, second fastening portion (4322) is tightly attached on the first side of the claw (42) bottom end, and described first
Unfreezing section (4313) and the second unfreezing section (4323) can be fashionable by the box cupling under, in the work of the box cupling when moving up
With lower unfreezing.
7. tool according to claim 6, which is characterized in that the bottom end of the claw (42) is provided with locking teeth (8), institute
Stating locking teeth (8) includes fixed part (81) and card-tight part (82), top and the fixed part (81) of the card-tight part (82)
The outer diameter of bottom end connection and the fixed part (81) is greater than the outer diameter of the card-tight part (82)；
The fixed part (81) for being fixed on the box cupling, the card-tight part (82) and first fastening portion (4312) and
Second fastening portion (4322) contact.
8. tool according to claim 1, which is characterized in that between the spiral pipe nipple (2) and the exhaust pipe nipple (3)
It is connected with bolster (9).
9. tool according to claim 1, which is characterized in that the pulling head (1) and spiral pipe nipple (2) screw thread connect
It connects, and is limited between the pulling head (1) and the spiral pipe nipple (2) by anti-turn screw (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821169972.3U CN208830921U (en) | 2018-07-23 | 2018-07-23 | The locking tool of plunger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821169972.3U CN208830921U (en) | 2018-07-23 | 2018-07-23 | The locking tool of plunger |
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| Publication Number | Publication Date |
|---|---|
| CN208830921U true CN208830921U (en) | 2019-05-07 |
Family
ID=66307080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821169972.3U Active CN208830921U (en) | 2018-07-23 | 2018-07-23 | The locking tool of plunger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208830921U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439434A (en) * | 2020-11-06 | 2022-05-06 | 中国石油化工股份有限公司 | Plunger device |
-
2018
- 2018-07-23 CN CN201821169972.3U patent/CN208830921U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439434A (en) * | 2020-11-06 | 2022-05-06 | 中国石油化工股份有限公司 | Plunger device |
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