CN103157634A - Annular circulation cleaning device in expansion pipe - Google Patents
Annular circulation cleaning device in expansion pipe Download PDFInfo
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- CN103157634A CN103157634A CN201310096269XA CN201310096269A CN103157634A CN 103157634 A CN103157634 A CN 103157634A CN 201310096269X A CN201310096269X A CN 201310096269XA CN 201310096269 A CN201310096269 A CN 201310096269A CN 103157634 A CN103157634 A CN 103157634A
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- expansion
- seat
- cleaning device
- sliding sleeve
- circulation cleaning
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- 238000004140 cleaning Methods 0.000 title claims abstract description 45
- 210000002445 nipple Anatomy 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 7
- 239000004576 sand Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000029058 respiratory gaseous exchange Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Abstract
The invention relates to an annular circulation cleaning device in an expansion pipe, which comprises an expansion cone seat and an expansion cone sleeved on the upper part of the expansion cone seat; the inner pipe wall of the expansion cone seat is hermetically provided with a sliding sleeve, and the inner wall surface of the sliding sleeve is provided with an annular groove; a positioning seat is fixedly arranged at the bottom of the expansion conical seat, a central hole communicated with the expansion pipe launching cavity is axially arranged on the positioning seat, and a first pressure spring is arranged between the positioning seat and the sliding sleeve; a plurality of through holes are formed in the pipe wall of the upper part of the expansion conical seat along the circumferential direction, and the through holes are sealed and shielded by the side wall of the upper end of the sliding sleeve; and a starting cleaning plug is axially arranged in the sliding sleeve. The annular circulation cleaning device in the expansion pipe provides a solution for sticking sand or other foreign matters in an expansion cone working area in the construction process; the annular space on the inner wall of the expansion pipe and the working area of the expansion cone can be cleaned circularly, and the area to be expanded is kept clean, so that the smooth expansion construction is ensured.
Description
Technical field
The invention relates to a kind of expansion tube construction tool for petroleum industry, relate in particular to annular space circulation cleaning device in a kind of expansion tube.
Background technology
Bulged tube technology is a new technology that is surging forward in recent years, and it can be applicable to the operation process such as drilling well, completion and oil recovery, well workover.The expansion tube expansion process is the process of body flow harden, expansion fashion has the modes such as mechanical type, fluid pressure type, the conventional expansion pipe tool that uses at the serious well that shakes out at present, the contact surface that be difficult to guarantee swollen cone workspace (that is: expansion cone contact with expansion tube zone) in operation process cleans, so be easy to occur the sticking card of sand card or other foreign matters, hinder carrying out smoothly of expanding, even cause constructing unsuccessfully.
Thus, the inventor proposes annular space circulation cleaning device in a kind of expansion tube, to overcome the defective of prior art by means of being engaged in experience and the practice of relevant industries for many years.
Summary of the invention
The object of the present invention is to provide annular space circulation cleaning device in a kind of expansion tube, can realize wash cycles expansion tube inwall annular space and expansion cone workspace, keep treating the breathing space cleaning, thus the carrying out smoothly of the construction of guaranteeing to expand.
The object of the present invention is achieved like this, annular space circulation cleaning device in a kind of expansion tube, and this circulation cleaning device includes the sheathed expansion cone of expansion cone seat and expansion cone seat top; The inner tubal wall sealing shroud of described expansion cone seat is provided with a sliding sleeve, and the internal face of described sliding sleeve is provided with an annular groove; Described expansion cone seat bottom is fixed with a positioning seat, is axially arranged with conducting on this positioning seat in the centre bore of expansion tube emission cavity, is provided with the first stage clip between this positioning seat and sliding sleeve; The tube wall on described expansion cone seat top is along being circumferentially with a plurality of open-works, and described a plurality of open-works are blocked by sliding sleeve upper end sidewall sealing; Be axially arranged with one in described sliding sleeve and start the cleaning obstruction; Described startup is cleaned to stop up and is included upper spring seat, lower spring cup and positioning pipe from top to bottom, and described upper spring seat comprises that sealed sliding is located at the plunger portion in sliding sleeve, and this plunger portion top upwards is provided with clamp column; Described positioning pipe top is fixedly connected with the lower spring cup bottom; Be provided with the second stage clip between described upper and lower spring base; Described lower spring cup and outside, positioning pipe upper end are provided with a sleeve, and the upper end of this sleeve is fixedly connected on the bottom of plunger portion; Described positioning pipe is divided into supporting section, active section and positioning section from top to bottom, the external diameter of described active section is greater than the external diameter of supporting section and positioning section, described positioning section is arranged in the centre bore of positioning seat, be provided with the changeover portion of flaring between described supporting section and active section, have the gap between the outer wall of described active section and the inwall of sleeve; On the barrel of described sleeve, the position of corresponding described supporting section is circumferentially with a plurality of location open-work, corresponding each location open-work is provided with locating detent outside described supporting section, described locating detent is made of the projection of arc bottom base and the setting of base upside, described projection is arranged in the open-work of described location, the bottom surface of described arc bottom base reclines with the periphery of supporting section is corresponding, is provided with making leaf spring between the upper bottom surface of arc bottom base and sleeve lining.
In a better embodiment of the present invention, the internal face of described expansion cone seat is stepped, and the outer wall of described sliding sleeve is also for stepped accordingly; The axial upper side edge of described sliding sleeve annular groove is provided with chamfering.
In a better embodiment of the present invention, the cone angle of the changeover portion between described supporting section and active section is 0～30 degree.
In a better embodiment of the present invention, the gap between described active section outer wall and sleeve lining equals the thickness sum of locating detent base and making leaf spring.
In a better embodiment of the present invention, described positioning pipe is axially arranged with a guide hole; The plunger portion below is to having guide pillar, and this guide pillar passes lower spring cup and is slidedly arranged in the guide hole of positioning pipe.
In a better embodiment of the present invention, described the second compression spring sleeve is located on described guide pillar.
In a better embodiment of the present invention, described clamp column is provided with annular groove.
In a better embodiment of the present invention, described plunger portion periphery is provided with sealed rubber ring.
In a better embodiment of the present invention, the external pipe nipple in described expansion cone seat top; Described pipe nipple is provided with the through hole with the corresponding conducting of a plurality of open-works of expansion cone seat; Outer wall at pipe nipple is provided with the axial notch relative with through hole.
In a better embodiment of the present invention, described location open-work and projection are square.
From the above mentioned, annular space circulation cleaning device in expansion tube of the present invention is for sand card or the sticking card of other foreign matters of swollen cone workspace in work progress provides solution; Can realize wash cycles expansion tube inwall annular space and expansion cone workspace, keep treating the breathing space cleaning, thus the carrying out smoothly of the construction of guaranteeing to expand.
Description of drawings
The following drawings only is intended to the present invention is done and schematically illustrates and explain, not delimit the scope of the invention.Wherein:
Fig. 1: be the perspective view of annular space circulation cleaning device in expansion tube of the present invention.
Fig. 2: be the surface structure schematic diagram of annular space circulation cleaning device in expansion tube of the present invention.
Fig. 3: be the sectional structure schematic diagram of annular space circulation cleaning device in expansion tube of the present invention.
Fig. 4: clean the perspective view of stopping up for starting in the present invention.
Fig. 5: be the structural representation of positioning pipe in the present invention.
Fig. 6 A: clean the structural representation that the locating detent that stops up does not stretch out state for starting in the present invention.
Fig. 6 B: be A-A cross-sectional view in Fig. 6 A.
Fig. 7 A: clean the structural representation that the locating detent that stops up stretches out state for starting in the present invention.
Fig. 7 B: be B-B cross-sectional view in Fig. 7 A.
Fig. 8 A: be the sectional structure schematic diagram of locating detent in the present invention.
Fig. 8 B: be the perspective view of locating detent in the present invention.
Fig. 9: access diagram is suppressed in the expansion when starting the cleaning obstruction for not being lowered in the present invention.
Figure 10: the wash cycles access diagram when starting the cleaning obstruction for being lowered in the present invention.
The specific embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast description of drawings the specific embodiment of the present invention.
as Fig. 1, Fig. 2, shown in Figure 3, the present invention proposes annular space circulation cleaning device 100 in a kind of expansion tube, this circulation cleaning device 100 includes the sheathed expansion cone 2 of expansion cone seat 1 and expansion cone seat 1 top, as shown in Figure 3, described expansion cone seat 1 and expansion cone 2 are arranged in expansion tube 9 (in Fig. 3 shown in chain-dotted line), the inner tubal wall sealing shroud of described expansion cone seat 1 is provided with a sliding sleeve 3, the internal face of described sliding sleeve 3 is provided with an annular groove 31, described expansion cone seat 1 bottom is fixed with a positioning seat 4, is axially arranged with conducting on this positioning seat 4 in the centre bore 41 of expansion tube 9 emission cavities, is provided with the first stage clip 5 between this positioning seat 4 and sliding sleeve 3, the tube wall on described expansion cone seat 1 top is along being circumferentially with a plurality of open-works 11, and described open-work 11 is positioned at the upside of expansion cone 2, and in the present embodiment, described open-work 11 is evenly equipped with four, and described a plurality of open-works 11 are blocked by sliding sleeve 3 upper end sidewall sealings, be axially arranged with one in described sliding sleeve 3 and start cleaning obstruction 6, as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6 A, Fig. 6 B, Fig. 7 A and Fig. 7 B, described startup is cleaned obstruction 6 and is included upper spring seat 61, lower spring cup 62 and positioning pipe 63 from top to bottom, described upper spring seat 61 comprises that sealed sliding is located at the plunger portion 611 of sliding sleeve 3 inwalls, this plunger portion 611 tops upwards are provided with clamp column 612, described clamp column 612 is provided with annular groove 6121, plunger portion 611 belows are to having guide pillar 613, described positioning pipe 63 is axially arranged with a guide hole 635, and this guide pillar 613 passes lower spring cup 62 and is slidedly arranged in the guide hole 635 of positioning pipe 63, described positioning pipe 63 tops are fixedly connected with lower spring cup 62 bottoms, be provided with the second stage clip 64 between described upper spring seat 61, lower spring cup 62, this second stage clip 64 is set on described guide pillar 613, the outside of described lower spring cup 62 and positioning pipe 63 upper ends is provided with a sleeve 65, and the upper end of this sleeve 65 is fixedly connected on the bottom of plunger portion 611, and (when above-mentioned the second stage clip 64 did not compress, the lower end of sleeve 65 was positioned near the medium position of positioning pipe 63, so that during the second stage clip 64 pressurized, sleeve 65 has enough displacement), as shown in Figure 5, described positioning pipe 63 is divided into respectively supporting section 631, active section 632 and positioning section 633 from top to bottom, the external diameter of described active section 632 is greater than the external diameter of supporting section 631 and positioning section 633, described positioning section 633 wears and fixes in the centre bore 41 of positioning seat 4, be provided with the changeover portion 634 of flaring between described supporting section 631 and active section 632, have the gap between the inwall of the outer wall of described active section 632 and sleeve 65, as Fig. 3, shown in Figure 4, on the barrel of described sleeve 65, the position of corresponding described supporting section 631 is circumferentially with a plurality of square location open-work 651, corresponding each square location open-work 651 is provided with locating detent 66 (at this moment in described supporting section 631 outsides, the second spring 64 is not compressed, start cleaning obstruction 6 and be in off working state), described locating detent 66 is made of (as Fig. 8 A the square projection 662 of arc bottom base 661 and base 661 upside settings, shown in Fig. 8 B), described square projection 662 is arranged in described square location open-work 651, corresponding the reclining of periphery of the bottom surface of described arc bottom base 661 and supporting section 631, be provided with making leaf spring 67 between the upper bottom surface of arc bottom base 661 and sleeve 65 inwalls.In the present embodiment, described making leaf spring 67 is planar structure, and the intermediate position is provided with the open-work that can pass described square projection 662.
From the above mentioned, annular space circulation cleaning device in expansion tube of the present invention is for sand card or the sticking card of other foreign matters of swollen cone workspace in work progress provides solution; Can realize wash cycles expansion tube inwall annular space and expansion cone workspace, keep treating the breathing space cleaning, from face the carrying out smoothly of construction of guaranteeing to expand.
Further, as shown in Figure 3, the internal face of described expansion cone seat 1 is made as stepped, and the outer wall of described sliding sleeve 3 is also for stepped accordingly; The axial upper side edge of the annular groove 31 of described sliding sleeve 3 is provided with chamfering 311, and after suppressing end, described chamfering 311 is convenient to locating detent 66 and is separated from this annular groove 31.
As shown in Figure 5, the cone angle beta of described changeover portion 634 is 0～30 degree; As shown in Fig. 7 A, the size in the gap between described active section 632 outer walls and sleeve 65 inwalls equals the thickness sum of locating detent base 661 and making leaf spring 67.
As shown in Figure 4, in the present embodiment, described plunger portion 611 peripheries are provided with sealed rubber ring 6111.
As Fig. 1, shown in Figure 3, the external pipe nipple 7 in described expansion cone seat 1 top; Described pipe nipple 7 is provided with the through hole 71 with a plurality of open-works 11 corresponding conductings of expansion cone seat 1; Outer wall at pipe nipple 7 is provided with the axial notch 72 relative with through hole 71, so that when cleaning expansion tube inwall and expansion cone workspace, current are current smoothly.
in expansion tube of the present invention, the use procedure of annular space circulation cleaning device is, when carrying out the normal expansion construction, described startup is cleaned and is stopped up 6 first not being lowered in described sliding sleeve 3, as shown in Figure 9, at this moment, the open-work 11 on expansion cone seat 1 top blocks and seals (the first stage clip 5 compresses sliding sleeve 3) by sliding sleeve 3, by expansion cone seat 1, passage is suppressed in the expansion of centre bore 41 completes of sliding sleeve 3 and positioning seat 4, for the construction of expanding provides the airtight stable pressing system of building, pressure promotion expansion cone seat 1 and expansion cone 2 are up, (principle and the method for described expansion tube expansion construction are same as the prior art for expansion tube 9 normal expansion, do not repeat them here).in the construction of expanding, when running into the sticking card of swollen cone workspace sand card or other foreign matters, by on put and put when there is no positive effect, to start cleaning obstruction 6 is lowered in sliding sleeve 3, promoted to start to clean by hydraulic pressure and stop up 6 arrival predeterminated positions (that is: described positioning section 633 wears and fixes in the centre bore 41 of positioning seat 4), at this moment, start to clean stop up sleeve 65 in 6 promote locating detents 66 by the supporting section 631 of positioning pipe through changeover portions 634 to active section 632 motions (as shown in Fig. 6 A and Fig. 7 A), at this moment, locating detent 66 is by changeover portion 634 jack-up (or lifting) and snapping in the annular groove 31 of sliding sleeve 3 gradually, fluid pressure continues to promote locating detent 66 by sleeve 65 and moves down, after the pressure of thrust greater than the first stage clip 5, thrust will promote sliding sleeve 3 by locating detent 66 and move down, as shown in figure 10, at this moment, the upper end sidewall of sliding sleeve 3 is opened a plurality of open-works 11 on expansion cone seat 1, make cleaning fluid enter annular space in expansion tube by described open-work 11, realize thus wash cycles expansion tube inwall annular space and expansion cone working face, and then complete unfreezing.After unfreezing is completed, be lowered to fishing tool in oil pipe, trip out to start to clean and stop up 6; Stopped suppressing this moment, and locating detent 66 has been separated from the cannelure 31 in sliding sleeve 3 under the effect of the first stage clip 5, the second stage clip 64 and making leaf spring 67; Fishing tool cleans with startup the clamp column 612 of stopping up 6 tops and docks, and this moment, fishing tool blocked the annular groove 6121 of clamp column 612, lifted fishing tool, can trip out the startup cleaning and stop up 6.After tripping out startup cleaning obstruction, continue build-up pressure, expansion tube continues normal expansion.
Annular space circulation cleaning device in expansion tube of the present invention is for sand card or the sticking card of other foreign matters of swollen cone workspace in work progress provides solution; Can realize wash cycles expansion tube inwall annular space and expansion cone workspace, keep treating the breathing space cleaning, thus the carrying out smoothly of the construction of guaranteeing to expand.
The above only is the schematic specific embodiment of the present invention, is not to limit scope of the present invention.Any those skilled in the art, the equivalent variations of having done under the prerequisite that does not break away from design of the present invention and principle and modification all should belong to the scope of protection of the invention.
Claims (10)
1. annular space circulation cleaning device in an expansion tube, this circulation cleaning device includes the sheathed expansion cone of expansion cone seat and expansion cone seat top; It is characterized in that: the inner tubal wall sealing shroud of described expansion cone seat is provided with a sliding sleeve, and the internal face of described sliding sleeve is provided with an annular groove; Described expansion cone seat bottom is fixed with a positioning seat, is axially arranged with conducting on this positioning seat in the centre bore of expansion tube emission cavity, is provided with the first stage clip between this positioning seat and sliding sleeve; The tube wall on described expansion cone seat top is along being circumferentially with a plurality of open-works, and described a plurality of open-works are blocked by sliding sleeve upper end sidewall sealing; Be axially arranged with one in described sliding sleeve and start the cleaning obstruction; Described startup is cleaned to stop up and is included upper spring seat, lower spring cup and positioning pipe from top to bottom, and described upper spring seat comprises that sealed sliding is located at the plunger portion in sliding sleeve, and this plunger portion top upwards is provided with clamp column; Described positioning pipe top is fixedly connected with the lower spring cup bottom; Be provided with the second stage clip between described upper and lower spring base; Described lower spring cup and outside, positioning pipe upper end are provided with a sleeve, and the upper end of this sleeve is fixedly connected on the bottom of plunger portion; Described positioning pipe is divided into supporting section, active section and positioning section from top to bottom, the external diameter of described active section is greater than the external diameter of supporting section and positioning section, described positioning section is arranged in the centre bore of positioning seat, be provided with the changeover portion of flaring between described supporting section and active section, have the gap between the outer wall of described active section and the inwall of sleeve; On the barrel of described sleeve, the position of corresponding described supporting section is circumferentially with a plurality of location open-work, corresponding each location open-work is provided with locating detent outside described supporting section, described locating detent is made of the projection of arc bottom base and the setting of base upside, described projection is arranged in the open-work of described location, the bottom surface of described arc bottom base reclines with the periphery of supporting section is corresponding, is provided with making leaf spring between the upper bottom surface of arc bottom base and sleeve lining.
2. annular space circulation cleaning device in expansion tube as claimed in claim 1, it is characterized in that: the internal face of described expansion cone seat is stepped, the outer wall of described sliding sleeve is also for stepped accordingly; The axial upper side edge of described sliding sleeve annular groove is provided with chamfering.
3. annular space circulation cleaning device in expansion tube as claimed in claim 1, it is characterized in that: the cone angle of the changeover portion between described supporting section and active section is 0～30 degree.
4. annular space circulation cleaning device in expansion tube as claimed in claim 1, it is characterized in that: the gap between described active section outer wall and sleeve lining equals the thickness sum of locating detent base and making leaf spring.
5. annular space circulation cleaning device in expansion tube as claimed in claim 1, it is characterized in that: described positioning pipe is axially arranged with a guide hole; The plunger portion below is to having guide pillar, and this guide pillar passes lower spring cup and is slidedly arranged in the guide hole of positioning pipe.
6. annular space circulation cleaning device in expansion tube as claimed in claim 5, it is characterized in that: described the second compression spring sleeve is located on described guide pillar.
7. annular space circulation cleaning device in expansion tube as claimed in claim 1, it is characterized in that: described clamp column is provided with annular groove.
8. annular space circulation cleaning device in expansion tube as claimed in claim 1, it is characterized in that: described plunger portion periphery is provided with sealed rubber ring.
9. annular space circulation cleaning device in expansion tube as claimed in claim 1, is characterized in that: the external pipe nipple in described expansion cone seat top; Described pipe nipple is provided with the through hole with the corresponding conducting of a plurality of open-works of expansion cone seat; Outer wall at pipe nipple is provided with the axial notch relative with through hole.
10. annular space circulation cleaning device in expansion tube as claimed in claim 1, it is characterized in that: described location open-work and projection are square.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310096269.XA CN103157634B (en) | 2013-03-25 | 2013-03-25 | Annular circulation cleaning device in expansion pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310096269.XA CN103157634B (en) | 2013-03-25 | 2013-03-25 | Annular circulation cleaning device in expansion pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103157634A true CN103157634A (en) | 2013-06-19 |
| CN103157634B CN103157634B (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310096269.XA Active CN103157634B (en) | 2013-03-25 | 2013-03-25 | Annular circulation cleaning device in expansion pipe |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3747674A (en) * | 1971-05-06 | 1973-07-24 | Tri State Oil Tools Inc | Wash-over pipe spear apparatus |
| US4603743A (en) * | 1985-02-01 | 1986-08-05 | Mwl Tool & Supply Company | Hydraulic/mechanical setting tool and liner hanger |
| US4877085A (en) * | 1988-12-27 | 1989-10-31 | Pullig Jr Joe G | Manually operated spear apparatus |
| CN2756816Y (en) * | 2004-12-17 | 2006-02-08 | 王仁前 | Sand-proof pipe external gravel filling sand-proof well-flushing compensator |
| CN201705260U (en) * | 2010-05-12 | 2011-01-12 | 中国石油天然气股份有限公司 | Hydraulic jet blockage removing device |
| CN202673220U (en) * | 2012-06-26 | 2013-01-16 | 郝建广 | Ejector for blocking removal |
| CN102979481A (en) * | 2012-12-18 | 2013-03-20 | 中国石油天然气股份有限公司 | Anti-blocking constant pressure switch of water injection pipe column |
| CN203235722U (en) * | 2013-03-25 | 2013-10-16 | 中国石油天然气股份有限公司 | Annular circulation cleaning device in expansion pipe |
-
2013
- 2013-03-25 CN CN201310096269.XA patent/CN103157634B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3747674A (en) * | 1971-05-06 | 1973-07-24 | Tri State Oil Tools Inc | Wash-over pipe spear apparatus |
| US4603743A (en) * | 1985-02-01 | 1986-08-05 | Mwl Tool & Supply Company | Hydraulic/mechanical setting tool and liner hanger |
| US4877085A (en) * | 1988-12-27 | 1989-10-31 | Pullig Jr Joe G | Manually operated spear apparatus |
| CN2756816Y (en) * | 2004-12-17 | 2006-02-08 | 王仁前 | Sand-proof pipe external gravel filling sand-proof well-flushing compensator |
| CN201705260U (en) * | 2010-05-12 | 2011-01-12 | 中国石油天然气股份有限公司 | Hydraulic jet blockage removing device |
| CN202673220U (en) * | 2012-06-26 | 2013-01-16 | 郝建广 | Ejector for blocking removal |
| CN102979481A (en) * | 2012-12-18 | 2013-03-20 | 中国石油天然气股份有限公司 | Anti-blocking constant pressure switch of water injection pipe column |
| CN203235722U (en) * | 2013-03-25 | 2013-10-16 | 中国石油天然气股份有限公司 | Annular circulation cleaning device in expansion pipe |
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| Publication number | Publication date |
|---|---|
| CN103157634B (en) | 2014-11-05 |
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