CN208456568U - A kind of resistance oil nozzle sleeve of fast demountable - Google Patents
A kind of resistance oil nozzle sleeve of fast demountable Download PDFInfo
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- CN208456568U CN208456568U CN201820911138.0U CN201820911138U CN208456568U CN 208456568 U CN208456568 U CN 208456568U CN 201820911138 U CN201820911138 U CN 201820911138U CN 208456568 U CN208456568 U CN 208456568U
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- oil nozzle
- resistance
- oil
- cartridge filter
- threeway
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Abstract
The utility model relates to a kind of resistance oil nozzle sleeves of fast demountable, the upper port of threeway is screwed with sealing plug, oil nozzle is installed in the oil nozzle seat of threeway lower end inner cavity, the lower end of oil nozzle is plugged in oil nozzle seat centre bore, multiple tracks oil nozzle sealing ring is embedded on the lower circumferential of oil nozzle, the middle bench of oil nozzle is pressed in above oil nozzle seat, the lower ending opening of oil nozzle centre bore, the upper end of oil nozzle centre bore extends to the middle section of oil nozzle, multiple oil nozzle radial holes are evenly distributed on the circumference in oil nozzle middle section, the inner termination of each oil nozzle radial hole connects with oil nozzle centre bore respectively, the upper end of oil nozzle is equipped with oil nozzle external screw thread, cartridge filter is screwed on oil nozzle external screw thread, multiple filter hole are evenly distributed in the circumferential wall of cartridge filter, the upper end opening of cartridge filter；The upper surface center of oil nozzle is equipped with oil nozzle screw-threaded counterbore, is screwed with pull rod in oil nozzle screw-threaded counterbore, the upper end of pull rod extends to the top of high pressure oil inlet.The resistance oil nozzle sleeve is greatly improved disassembly efficiency and safety, and sand control ability is stronger.
Description
Technical field
The utility model relates to a kind of resistance oil nozzle sleeve more particularly to a kind of resistance oil nozzle sleeves of fast demountable, belong to production facilities
Technical field.
Background technique
Resistance oil nozzle sleeve is an indispensable accessory in petroleum industry production, is widely used in electric pump well, flowing well, steam injection well
Deng matching, be typically mounted at the threeway of wellhead oil tree with production tree, for controlling oil pressure and oil pump capacity.Traditional
Resistance oil nozzle sleeve includes threeway, and the left port of threeway is high pressure oil inlet, and the inner cavity of high pressure oil inlet is equipped with oil nozzle seat, at oil nozzle seat
Be screwed with oil nozzle, the left end of oil nozzle is equipped with sand control cap, and the centre exit of threeway is low pressure oil outlet downwards, low pressure oil outlet with
Standpipe connection, the right output port of threeway are equipped with dismountable sealing silk plug, i.e. sealing silk plug is mounted on low-pressure end.The height of 35MPa
Pressure oil flows out after the filtering of sand control cap from the centre bore of oil nozzle, and pressure reduction to 4MPa, low pressure oil is downwardly into low pressure pipe.
In oil recovery process, oil nozzle or sand control cap quickly increase once blocking and will lead to well head pressure, the reason is that sand control cap
Eyelet is few easily stifled, needs to close the valve of high-voltage end and low-pressure end at this time, lays down the sealing silk plug of resistance oil nozzle sleeve threeway right output port, uses
Spanner insertion oil nozzle hexagonal counterbore in oil nozzle is screwed off from oil nozzle seat, then from the right output port of resistance oil nozzle sleeve threeway take out oil nozzle and
Sand control cap and oil nozzle are screwed on by sand control cap after clearing up sand control cap or replacement oil nozzle, then from the right output port of resistance oil nozzle sleeve threeway to
Oil nozzle is tightened in oil nozzle seat by left insertion again eventually by spanner.
Sometimes up to ten times or so, existing resistance oil nozzle sleeve is cumbersome and not when unloading oil nozzle for a well inspection in one day disassembly
Safety, is mainly manifested in the following aspects: after 1. oil nozzles unscrew, usually hanging over driving end by the hexagonal counterbore of oil nozzle itself
Portion, to right translation until taking out from the right output port of resistance oil nozzle sleeve threeway, in the process, oil nozzle is easy to fall off from spanner, falls into
In the standpipe of resistance oil nozzle sleeve threeway, then to take out needs and go to war, it is cumbersome.2. oil nozzle is installed, driving end is also hung over
Portion's level is inserted into the left, equally there is the danger fallen into standpipe.3. taking oil nozzle at present is opened at resistance oil nozzle sleeve down stream low pressure end,
Sometimes oil nozzle is blocked, and low-pressure end does not have pressure, can high pressure end pressure do not drop a bit, it is abnormally dangerous at this moment to unload oil nozzle, is easy hair
Raw casualty accident.
Utility model content
The purpose of this utility model is that overcoming problems of the prior art, a kind of oil of fast demountable is provided
Muzzle can prevent the case where oil nozzle is fallen into production flow line generation, greatly improve disassembly efficiency and safety, and sand control ability is more
By force.
In order to solve the above technical problems, the resistance oil nozzle sleeve of a kind of fast demountable of the utility model, including resistance oil nozzle sleeve threeway,
The middle part of the resistance oil nozzle sleeve threeway is high pressure oil inlet, and the lower port of the resistance oil nozzle sleeve threeway is low pressure oil outlet, the oil nozzle
The upper port for covering threeway is disassembly mouth, and the upper port of the resistance oil nozzle sleeve threeway is screwed with sealing plug, the resistance oil nozzle sleeve threeway
Lower end inner cavity is welded with oil nozzle seat, is equipped with oil nozzle seat centre bore along the axis of the oil nozzle seat, is equipped with oil in the oil nozzle seat
Mouth, the oil nozzle be it is up big and down small step-like, the lower end of the oil nozzle is plugged in the oil nozzle seat centre bore, the oil nozzle
Lower circumferential on embedded with multiple tracks oil nozzle sealing ring realize the sealing between oil nozzle seat center bore inner wall, in the oil nozzle
Portion's step is pressed on the upper surface of the oil nozzle seat, and the axis along the oil nozzle is equipped with oil nozzle centre bore, the oil nozzle centre bore
Lower ending opening, the upper end of the oil nozzle centre bore extends to the middle section of oil nozzle, is uniformly distributed on the circumference in the oil nozzle middle section
There are multiple oil nozzle radial holes, the inner termination of each oil nozzle radial hole connects with oil nozzle centre bore respectively, and the upper end of the oil nozzle is set
There is oil nozzle external screw thread, cartridge filter is screwed on the oil nozzle external screw thread, is evenly distributed in the circumferential wall of the cartridge filter multiple
Filter hole, the upper end opening of the cartridge filter；The upper surface center of the oil nozzle is equipped with oil nozzle screw-threaded counterbore, the oil nozzle screw thread
Pull rod is screwed in counterbore, the upper end of the pull rod extends to the top of the high pressure oil inlet.
Compared with the existing technology, the utility model achieves following the utility model has the advantages that when installing, and cartridge filter is first screwed in oil
Then the lower end of pull rod is screwed in the upper end center of oil nozzle by the upper end of mouth, then clamp pull rod for oil nozzle and be downwardly into oil nozzle
It covers in threeway, until the lower end of oil nozzle is plugged in the centre bore of oil nozzle seat, is then screwed in the upper port of resistance oil nozzle sleeve threeway close
Seal plug screw.In use, high pressure oil inlet of the high pressure oil in the middle part of resistance oil nozzle sleeve threeway enters in resistance oil nozzle sleeve, first downwards through cartridge filter mistake
Filter retains clast and dregs, is introduced into oil nozzle radial hole after the outflow of each filter hole, then enter oil nozzle center from oil nozzle radial hole
Hole is simultaneously downwardly into low pressure oil outlet, and oil nozzle is pressed in oil nozzle seat by the oil pressure of high pressure oil, and pine will not occur in use process
De- phenomenon, oil nozzle sealing ring ensure the sealing between oil nozzle seat.The elder generation when the dregs in cartridge filter are excessive, need to take out oil nozzle
Pressure release emptying, and high-voltage end valve is first closed, it is rear to close low-pressure end valve, then lay down the sealing spiral shell of resistance oil nozzle sleeve threeway upper end
Plug, is integrally extracted oil nozzle together with cartridge filter by pull rod upwards, after clearing up cartridge filter and dredging oil nozzle, after reinstalling, is beaten
Low-pressure end valve is first opened when opening, after open high-voltage end valve, the valve plate of low-pressure end standpipe valve is had little effect.Due to oil nozzle
Vertical installation, the centre bore of oil nozzle seat is less than the outer diameter of oil nozzle, so that oil nozzle in disassembly process, will not fall into production flow line
In, avoid the trouble that oil nozzle is taken out from production flow line.Mounting and dismounting oil nozzle is carried out in resistance oil nozzle sleeve high-voltage end, is avoided out
Existing oil nozzle blocks the risk of hurting sb.'s feelings for making high pressure oil build the pressure, operation more safe ready.The area of cartridge filter is bigger, and filter hole is more
More, sand control ability is stronger, reduces the dismounting frequency of oil nozzle.
As the improvement of the utility model, the upper end of the pull rod is equipped with the pull ring being linked together with pull rod.Pass through pull ring
More easily control pull rod connection oil nozzle can be pulled out, further save the time of dismounting oil nozzle.
Oil nozzle gasket, institute are set with below the oil nozzle middle bench as a further improvement of the utility model,
The lower end surface for stating oil nozzle gasket is pressed on the upper surface of the oil nozzle seat.On the basis of circumferential sealing, increase oil nozzle sealing
The end face seal of pad, can be further improved sealing effect.
The bottom wall central of the cartridge filter is equipped in the cartridge filter upwardly extended as a further improvement of the utility model,
Heart swivel nut, cartridge filter center swivel nut are screwed on the oil nozzle external screw thread.Oil nozzle is screwed in by cartridge filter center swivel nut
It is more convenient to be operated under external environment on external screw thread, and make the concentricity of cartridge filter and oil nozzle more preferable.
The annular section of the cartridge filter bottom wall is also evenly distributed with multiple mistakes as a further improvement of the utility model,
Filter opening.Can more filter hole number, improve filter capacity.
It is convex to be equipped with the cartridge filter outwardly protruded for the upper port of the cartridge filter as a further improvement of the utility model,
The outer wall middle part of circle, the cartridge filter flange collar is embedded with cartridge seal circle, the periphery of the cartridge seal circle and the oil
The inner wall of muzzle threeway fits.On the one hand guarantee that all high pressure oils fully enter the inner cavity of cartridge filter and are filtered, it is another
Aspect plays a supporting role to the upper end of cartridge filter.
The lower end of the sealing plug is screwed in the upper of the resistance oil nozzle sleeve threeway as a further improvement of the utility model,
In port, the middle part of the sealing plug is equipped with the plug screw flange collar outwardly protruded, and the lower end surface of the plug screw flange collar is equipped with plug screw
Gasket, the plug screw gasket are pressed at the top of the upper port of the resistance oil nozzle sleeve threeway, and the upper end of the sealing plug is equipped with spiral shell
Fill in turret head.With screwing for sealing plug, plug screw gasket is compacted, and realizes sealing；Turret head is screwed or is revolved convenient for spanner
Loose sealing plug.
Detailed description of the invention
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments, and attached drawing only provides ginseng
It examines and illustrates to use, it is non-to limit the utility model.
Fig. 1 is the structural schematic diagram of the resistance oil nozzle sleeve of the utility model fast demountable.
Fig. 2 is the cross-sectional view of oil nozzle in Fig. 1.
Fig. 3 is the cross-sectional view of cartridge filter in Fig. 1.
Fig. 4 is the structural schematic diagram of pull rod in Fig. 1.
Fig. 5 is the main view of sealing plug in Fig. 1.
In figure: 1. resistance oil nozzle sleeve threeways；1a. high pressure oil inlet；1b. low pressure oil outlet；2. sealing plug；2a. plug screw flange collar；
2b. plug screw turret head；3. oil nozzle seat；4. oil nozzle；4a. oil nozzle centre bore；4b. oil nozzle radial hole；4c. oil nozzle external screw thread；4d.
Oil nozzle screw-threaded counterbore；5. cartridge filter；5a. filter hole；5b. cartridge filter center swivel nut；5c. cartridge filter flange collar；6. pull rod；6a. is drawn
Ring；7. oil nozzle sealing ring；8. oil nozzle gasket；9. cartridge seal circle；10. plug screw gasket.
Specific embodiment
As shown in Figure 1, the resistance oil nozzle sleeve of the utility model fast demountable includes resistance oil nozzle sleeve threeway 1, in resistance oil nozzle sleeve threeway 1
Portion is high pressure oil inlet 1a, and the lower port of resistance oil nozzle sleeve threeway 1 is low pressure oil outlet 1b, and the upper port of resistance oil nozzle sleeve threeway 1 is disassembly
Mouthful, the upper port of resistance oil nozzle sleeve threeway 1 is screwed with sealing plug 2, and the lower end inner cavity of resistance oil nozzle sleeve threeway 1 is welded with oil nozzle seat 3, along oil
The axis of mouth seat 3 is equipped with oil nozzle seat centre bore, and oil nozzle 4 is equipped in oil nozzle seat 3, and oil nozzle 4 is up big and down small step-like, oil nozzle
4 lower end is plugged in oil nozzle seat centre bore, embedded with the realization of multiple tracks oil nozzle sealing ring 7 and oil nozzle on the lower circumferential of oil nozzle 4
Sealing between seat center bore inner wall, the middle bench of oil nozzle 4 are pressed on the upper surface of oil nozzle seat 3, and the axis along oil nozzle 4 is equipped with
The upper end of oil nozzle centre bore 4a, the lower ending opening of oil nozzle centre bore 4a, oil nozzle centre bore 4a extend to the middle section of oil nozzle 4, oil nozzle
Be evenly distributed with multiple oil nozzle radial hole 4b on the circumference in middle section, the inner termination of each oil nozzle radial hole 4b respectively with oil nozzle centre bore
4a connects, and the upper end of oil nozzle 4 is equipped with oil nozzle external screw thread 4c, is screwed with cartridge filter 5, the circle of cartridge filter 5 on oil nozzle external screw thread 4c
Multiple filter hole 5a, the upper end opening of cartridge filter 5 are evenly distributed on peripheral wall；The upper surface center of oil nozzle 4 is equipped with oil nozzle screw thread
It is screwed with pull rod 6 in counterbore 4d, oil nozzle screw-threaded counterbore 4d, the upper end of pull rod 6 extends to the top of high pressure oil inlet 1a.
When installation, cartridge filter 5 is first screwed in the upper end of oil nozzle 4, the lower end of pull rod 6 is then screwed in the upper of oil nozzle 4
Then end center clamps pull rod 6 and oil nozzle 4 is downwardly into resistance oil nozzle sleeve threeway 1, until the lower end of oil nozzle 4 is plugged on oil nozzle seat 3
Centre bore in, then screw on sealing plug 2 in the upper port of resistance oil nozzle sleeve threeway 1.In use, high pressure oil is from resistance oil nozzle sleeve threeway 1
The high pressure oil inlet 1a at middle part enters in resistance oil nozzle sleeve, first filters through cartridge filter 5 downwards, clast and dregs is retained, from each filter hole
Oil nozzle radial hole 4b is introduced into after 5a outflow, then enters oil nozzle centre bore 4a from oil nozzle radial hole 4b and to be downwardly into low pressure fuel-displaced
Oil nozzle 4 is pressed in oil nozzle seat 3 by mouth 1b, the oil pressure of high pressure oil, and phenomenon, oil nozzle sealing ring will not be got loose in use process
7 ensure the sealing between oil nozzle seat 3.
When the dregs in cartridge filter 5 are excessive, need to take out oil nozzle 4, elder generation's pressure release is vented, and first closes high-voltage end valve,
Low-pressure end valve is closed afterwards, the sealing plug 2 of 1 upper end of resistance oil nozzle sleeve threeway is then laid down, by pull rod 6 by oil nozzle 4 together with filtering
Cylinder 5 is whole upwards to be extracted, and after clearing up cartridge filter 5 and dredging oil nozzle 4, after reinstalling, when opening first opens low-pressure end valve, after open
High-voltage end valve has little effect the valve plate of low-pressure end standpipe valve.Since oil nozzle 4 is vertically installed, the center of oil nozzle seat 3
The outer diameter that hole is less than oil nozzle 4 avoids taking from production flow line so that oil nozzle 4 will not fall into production flow line in disassembly process
The trouble of oil outlet 4.Mounting and dismounting oil nozzle 4 is carried out in resistance oil nozzle sleeve high-voltage end, and avoiding the occurrence of oil nozzle 4 and blocking makes high pressure oil
The risk of hurting sb.'s feelings to build the pressure, operation more safe ready.The area of cartridge filter 5 is bigger, and filter hole 5a is more, and sand control ability is stronger,
Reduce the dismounting frequency of oil nozzle 4.
The upper end of pull rod 6 is equipped with the pull ring 6a being linked together with pull rod 6, can be more easily control by pull rod 6 by pull ring 6a
It is connected to oil nozzle 4 to pull out, further saves the time of dismounting oil nozzle 4.
Oil nozzle gasket 8 is set with below oil nozzle middle bench, the lower end surface of oil nozzle gasket 8 is pressed in oil nozzle seat 3
On upper surface.On the basis of circumferential sealing, increases the end face seal of oil nozzle gasket 8, can be further improved sealing effect.
The bottom wall central of cartridge filter 5 is equipped with the cartridge filter center swivel nut 5b upwardly extended, and cartridge filter center swivel nut 5b is screwed on
On oil nozzle external screw thread 4c.It is screwed on oil nozzle external screw thread 4c by cartridge filter center swivel nut 5b, it is more convenient in external environment
Lower operation, and make cartridge filter 5 and the concentricity of oil nozzle 4 more preferable.
The annular section of 5 bottom wall of cartridge filter is also evenly distributed with multiple filter hole 5a, can the more number of filter hole 5a,
Improve filter capacity.
The upper port of cartridge filter 5 is equipped with the cartridge filter flange collar 5c outwardly protruded, is embedded in the middle part of the outer wall of cartridge filter flange collar 5c
There is cartridge seal circle 9, the periphery of cartridge seal circle 9 and the inner wall of resistance oil nozzle sleeve threeway 1 fit.On the one hand guarantee all
The inner cavity that high pressure oil fully enters cartridge filter 5 is filtered, and is on the other hand played a supporting role to the upper end of cartridge filter 5.
The lower end of sealing plug 2 is screwed in the upper port of resistance oil nozzle sleeve threeway 1, and the middle part of sealing plug 2 is equipped with convex
The lower end surface of plug screw flange collar 2a out, plug screw flange collar 2a are equipped with plug screw gasket 10, and plug screw gasket 10 is pressed in resistance oil nozzle sleeve threeway 1
Upper port at the top of, the upper end of sealing plug 2 is equipped with plug screw turret head 2b.With screwing for sealing plug 2, plug screw gasket 10
It is compacted, realizes sealing；Turret head screws or unscrews sealing plug 2 convenient for spanner.
The foregoing is merely the preferable possible embodiments of the utility model, patent that is non-therefore limiting to the utility model
Protection scope.In addition to the implementation, the utility model can also have other embodiments.It is all to use equivalent replacement or equivalent change
The technical solution to be formed is changed, is all fallen in the protection scope of the requires of the utility model.Technology of the utility model without description is special
Sign can realize that details are not described herein by or using the prior art.
Claims (7)
1. a kind of resistance oil nozzle sleeve of fast demountable, including resistance oil nozzle sleeve threeway, the middle part of the resistance oil nozzle sleeve threeway is high pressure oil inlet,
The lower port of the resistance oil nozzle sleeve threeway is low pressure oil outlet, and the upper port of the resistance oil nozzle sleeve threeway is disassembly mouth, it is characterised in that:
The upper port of the resistance oil nozzle sleeve threeway is screwed with sealing plug, and the lower end inner cavity of the resistance oil nozzle sleeve threeway is welded with oil nozzle seat, edge
The axis of the oil nozzle seat is equipped with oil nozzle seat centre bore, and oil nozzle is equipped in the oil nozzle seat, and the oil nozzle is up big and down small
Step-like, the lower end of the oil nozzle is plugged in the oil nozzle seat centre bore, and multiple tracks is embedded on the lower circumferential of the oil nozzle
Oil nozzle sealing ring realizes the sealing between oil nozzle seat center bore inner wall, and the middle bench of the oil nozzle is pressed in the oil nozzle seat
On upper surface, the axis along the oil nozzle is equipped with oil nozzle centre bore, the lower ending opening of the oil nozzle centre bore, the oil nozzle center
The upper end in hole extends to the middle section of oil nozzle, and multiple oil nozzle radial holes, each oil nozzle are evenly distributed on the circumference in the oil nozzle middle section
The inner termination of radial hole connects with oil nozzle centre bore respectively, and the upper end of the oil nozzle is equipped with oil nozzle external screw thread, outside the oil nozzle
It is screwed with cartridge filter on screw thread, multiple filter hole, the upper end of the cartridge filter are evenly distributed in the circumferential wall of the cartridge filter
Opening；The upper surface center of the oil nozzle is equipped with oil nozzle screw-threaded counterbore, is screwed with pull rod, the drawing in the oil nozzle screw-threaded counterbore
The upper end of bar extends to the top of the high pressure oil inlet.
2. the resistance oil nozzle sleeve of fast demountable according to claim 1, it is characterised in that: the upper end of the pull rod is equipped with and drawing
The pull ring that bar is linked together.
3. the resistance oil nozzle sleeve of fast demountable according to claim 1, it is characterised in that: the lower section of the oil nozzle middle bench
It is set with oil nozzle gasket, the lower end surface of the oil nozzle gasket is pressed on the upper surface of the oil nozzle seat.
4. the resistance oil nozzle sleeve of fast demountable according to claim 1 or 2 or 3, it is characterised in that: the bottom wall of the cartridge filter
Center is equipped with the cartridge filter center swivel nut upwardly extended, and cartridge filter center swivel nut is screwed on the oil nozzle external screw thread.
5. the resistance oil nozzle sleeve of fast demountable according to claim 4, it is characterised in that: the ring-shaped area of the cartridge filter bottom wall
Domain is also evenly distributed with multiple filter hole.
6. the resistance oil nozzle sleeve of fast demountable according to claim 1 or 2 or 3, it is characterised in that: the upper end of the cartridge filter
Mouth is equipped with the cartridge filter flange collar outwardly protruded, is embedded with cartridge seal circle, the mistake in the middle part of the outer wall of the cartridge filter flange collar
The periphery of filter cylinder sealing ring and the inner wall of the resistance oil nozzle sleeve threeway fit.
7. the resistance oil nozzle sleeve of fast demountable according to claim 1 or 2 or 3, it is characterised in that: under the sealing plug
End is screwed in the upper port of the resistance oil nozzle sleeve threeway, and the middle part of the sealing plug is equipped with the plug screw flange collar outwardly protruded, institute
The lower end surface for stating plug screw flange collar is equipped with plug screw gasket, and the plug screw gasket is pressed in the upper port top of the resistance oil nozzle sleeve threeway
The upper end in portion, the sealing plug is equipped with plug screw turret head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820911138.0U CN208456568U (en) | 2018-06-13 | 2018-06-13 | A kind of resistance oil nozzle sleeve of fast demountable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820911138.0U CN208456568U (en) | 2018-06-13 | 2018-06-13 | A kind of resistance oil nozzle sleeve of fast demountable |
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| Publication Number | Publication Date |
|---|---|
| CN208456568U true CN208456568U (en) | 2019-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820911138.0U Active CN208456568U (en) | 2018-06-13 | 2018-06-13 | A kind of resistance oil nozzle sleeve of fast demountable |
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| CN (1) | CN208456568U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111941342A (en) * | 2020-08-20 | 2020-11-17 | 中国人民解放军第五七二一工厂 | Special tool and method for assembling right-angle rotatable oil nozzle |
-
2018
- 2018-06-13 CN CN201820911138.0U patent/CN208456568U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111941342A (en) * | 2020-08-20 | 2020-11-17 | 中国人民解放军第五七二一工厂 | Special tool and method for assembling right-angle rotatable oil nozzle |
| CN111941342B (en) * | 2020-08-20 | 2024-02-09 | 中国人民解放军第五七二一工厂 | Right-angle rotatable oil nozzle assembly special tool and assembly method |
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