CN103244309A - Solid rocket punching composite engine shell - Google Patents
Solid rocket punching composite engine shell Download PDFInfo
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- CN103244309A CN103244309A CN201310156772XA CN201310156772A CN103244309A CN 103244309 A CN103244309 A CN 103244309A CN 201310156772X A CN201310156772X A CN 201310156772XA CN 201310156772 A CN201310156772 A CN 201310156772A CN 103244309 A CN103244309 A CN 103244309A
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- afterburning chamber
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Abstract
The invention provides a solid rocket punching composite engine shell which comprises a gas generator shell. A secondary combustion chamber shell is connected at the rear end of the gas generator shell, connection of the gas generator shell and the secondary combustion chamber shell includes that four pairs of generator supporting lugs and secondary combustion chamber supporting lugs which are correspondingly distributed in an equal central angle manner are designed around the gas generator shell and the secondary combustion chamber shell, and the generator supporting lugs and the secondary combustion chamber supporting lugs are connected through bolts and nuts; four groups of generator bosses and secondary combustion chamber bosses are designed between the four pairs of the generator supporting lugs and the secondary combustion chamber supporting lugs around the gas generator shell and the secondary combustion chamber shell, and locking holes matched with the generator bosses and the secondary combustion chamber bosses are reserved on wedge-shaped connecting plates which are embedded in the generator bosses and the secondary combustion chamber bosses through the locking holes to lock the gas generator shell and the secondary combustion chamber shell; two ends of the locking holes of the wedge-shaped connecting plates are wedge surfaces, the locking holes of the wedge-shaped connecting plates are in clearance fit with circumferential sides of the generator bosses and the secondary combustion chamber bosses, and the wedge surfaces at the two ends are in interference fit. Four window seats used for being connected with a gas incoming pipeline are arranged on the outer surface of the secondary combustion chamber shell.
Description
Technical field
The invention belongs to solid-rocket punching press combined engine structure field, be specifically related to a kind of solid-rocket punching press combined engine housing.
Background technique
The engine metal housing of existing solid propellant rocket generally is welded to form by spinning cylinder, front and back end socket and front and back skirt.Housing docks by the front and back skirt with each cabin section, the general less convex parts of housing outer surface.The powder charge core is placed and the sticking adiabatic layer often passes through front and back end socket opening.The motor powder charge that the very difficult adaptation of this structure outer diameter is little, slenderness ratio is big and the requirement of sticking adiabatic layer.
The motor body slenderness ratio of solid rocket ramjet is bigger, and the axial load factor 30g, the transverse acceleration that bear reach 25g, and housing requires high to strength and stiffness, require quality light simultaneously, and the structure space of housing limits tighter because satisfying the aerodynamic configuration requirement.Housing outer surface need design ignition mechanism fitting seat, journal stirrup, boss, intake duct fixed mounting, housing and be connected with the inter-stage section with outer journal stirrup etc.The housing slenderness ratio reaches 11.5, motor body wall thickness little (1.5mm), and housing outer diameter little (260mm) is a difficult problem to powder charge and sticking adiabatic layer, requires shell construction will be convenient to powder charge, is convenient to the making of heat insulation layer.
Summary of the invention
The object of the present invention is to provide a kind of solid-rocket punching press combined engine housing.Light and the structure of architecture quality and technology are simple, and fabricating cost is cheap, can bear greater impact load, is convenient to powder charge and heat insulation layer again and makes.
Technological scheme of the present invention: solid-rocket punching press combined engine housing of the present invention comprises the gas generator housing, connect the afterburning chamber housing in gas generator housing rear end, the gas generator housing with the connection of afterburning chamber housing is: the design of gas generator housing and afterburning chamber housing periphery corresponding etc. the four pairs of generator journal stirrups and the afterburning chamber journal stirrup of central angle distribution, the generator journal stirrup is connected by bolt, nut with the afterburning chamber journal stirrup; Four groups of generator boss of design and afterburning chamber boss between the four pairs of generator journal stirrups of gas generator housing and afterburning chamber housing periphery and afterburning chamber journal stirrup, locking hole with generator boss and afterburning chamber boss coupling is arranged on the wedge shape connecting plate, the wedge shape connecting plate is pressed into generator boss and afterburning chamber boss by this locking hole embedding, with gas generator housing and the locking of afterburning chamber housing.
The two ends of the locking hole of described wedge shape connecting plate are wedge surface, namely are interior corner cut at the junction plane with the generator boss outside, i.e. top rake β, β=8 °～13 °, the locking hole of wedge shape connecting plate is corner cut outside the junction plane with the afterburning chamber boss outside is, i.e. back rake angle θ, θ=-2 °～-7 °; The peripheral side of the locking hole of wedge shape connecting plate and generator boss and afterburning chamber boss adopts Spielpassung, and the two ends wedge surface is the interference drive fit.
Four outer chord ears of central angles such as described afterburning chamber housing rear end distribution, outer chord ear comprises the ear body, and the blasting bolt mounting hole is arranged on the ear body, the stiffening rib of ear body both sides, there is the absorbing groove root of chord ear, ear body and stiffening rib junction outside, design lightening hole on the stiffening rib.
The ear body thickness of slab 6mm of described outer chord ear, the stiffening rib thickness of slab 5mm of both sides; Described absorbing groove width 5mm, dark 10mm, bottom land is diameter 5mm circular arc.
The front end of described gas generator housing is sealed by end socket, establish internal thread junction surface, diameter successively in gas generator housing front end inboard less than the locating face of thread joint face, the diameter guide ring less than locating face, the locating face coupling of end socket outer flanged surface and gas generator housing, the guide ring coupling of flange anchor ring and gas generator housing inboard; Plane coupling on the end face of flange of end socket and the gas generator housing, cooperate the plane with end face of flange and gas generator housing to compress by the outside thread junction surface on the swivel nut with internal thread junction surface on the gas generator housing, end face of flange design at end socket has seal groove, has the 2nd O RunddichtringO to place closure gasket groove to realize the end face static seal on the both ends of the surface surface of contact.
Have four on the described afterburning chamber housing outer surface for the window seat that is connected with intake duct, four central angles such as window seat distribute.
Described gas generator housing and afterburning chamber housing joint thicken and are to inserting structure, are having sealed groove to place an O RunddichtringO to the surface of contact of inserting.
Advantage of the present invention: gas generator and dock assembly manipulation with instrument room, afterburning chamber housing convenient, simple is beneficial to and guarantees circumferential assembly precision; Gas generator housing design is ingenious, simplify the structure, and is convenient to making, the inspection of powder charge and insulating structure in structural member manufacturing and the convenient slender member.
The present invention has realized that thin-wall case bears the impulsive load while good rigidly of higher stage separation, the requirement that quality is light.Considered technology capability simultaneously, reduced to be out of shape and guaranteed that heat insulation layer is press-fitted the into smooth implementation of afterburning chamber housing.The present invention has alleviated operation pressure, has reduced cost.
A journal stirrup end ring connection ear structure need bear stage separation load 70KN behind the afterburning chamber housing; bear bigger impulsive load; when having vibration damping absorbing effect in order to guarantee to connect an ear structure; also have enough intensity and rigidity; design has vibration damping vibration absorbing structure, lightening hole, falls stress absorbing groove etc.; and increasing the rigidity stiffening rib, the heat insulation layer in protection afterburning chamber housing thin-wall spinning cylinder and the afterburning chamber housing prevents because being out of shape excessive the damage.
Description of drawings
Fig. 1 is general structure schematic representation of the present invention.
Fig. 2 is gas generator housing of the present invention and afterburning chamber housing linkage structure schematic representation.
Fig. 3 is the A-A sectional view of Fig. 2.
Fig. 4 is the B-B sectional view of Fig. 2.
Fig. 5 is afterburning chamber shell construction schematic representation of the present invention.
Fig. 6 is outer chord ear structure schematic representation.
Fig. 7 is A chord ear partial enlarged drawing outside namely of Fig. 6.
Fig. 8 is gas generator housing partial enlarged drawing of the present invention.
Fig. 9 is the end socket partial enlarged drawing.
Figure 10 is the swivel nut partial enlarged drawing.
Figure 11 is gas generator housing of the present invention and end socket joint structure partial enlarged view.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As Fig. 1, Fig. 2, Fig. 3, Fig. 4: the present invention connects afterburning chamber housing 2 in gas generator housing 1 rear end, gas generator housing 1 with the connection of afterburning chamber housing 2 is: the 2 periphery designs of gas generator housing 1 and afterburning chamber housing corresponding etc. the four couples of generator journal stirrup 1a and the afterburning chamber journal stirrup 2a of central angle distribution, generator journal stirrup 1a is connected by bolt, nut 3 with afterburning chamber journal stirrup 2a; Give birth between the four couples of generator journal stirrup 1a of device housing 1 and afterburning chamber housing 2 peripheries and the afterburning chamber journal stirrup 2a and establish four groups of generator boss 1b and afterburning chamber boss 2b sending out combustion gas, locking hole with generator boss 1b and afterburning chamber boss 2b coupling is arranged on the wedge shape connecting plate 4, wedge shape connecting plate 4 is pressed into generator boss 1b and afterburning chamber boss 2b by this locking hole embedding, with gas generator housing 1 and 2 lockings of afterburning chamber housing.Wedge shape connects that to be connected circumferential transpostion interval uniform with the journal stirrup bolt.
The locking hole of described wedge shape connecting plate 4 is interior corner cut at the junction plane with the generator boss 1b outside, be top rake β, β=8 °～13 °, the locking hole of wedge shape connecting plate 4 is corner cut outside the junction plane with afterburning chamber boss (2b) outside is, back rake angle θ, θ=-2 °～-7 °.Wedge shape connecting plate 4 and generator boss 1b, the protruding 2b of afterburning chamber cooperate generator 1 and afterburning chamber 2 butt joint end faces are compressed by wedge surface and fit together, the peripheral side of the locking hole of wedge shape connecting plate 4 and generator boss 1b and afterburning chamber boss 2b adopts Spielpassung, monolateral gap 1mm, it is the interference drive fit that the two ends wedge surface cooperates, the locking hole of wedge shape connecting plate 4 is pre-processed, during assembling, join by the locking hole of wedge shape connecting plate 4 and to make generator boss 1b and afterburning chamber boss 2b wedge surface, be press-fitted then and put in place.This structure radial space takies less, does not influence under the aerodynamic configuration condition and increased tie point, has increased the coupling stiffness of linkage structure, has strengthened the bending resistance of thin-wall case.
Described generator body 1 is thickeied with afterburning chamber housing 2 joints and is to inserting structure, is having sealed groove to place first O-ring seals 5 to the surface of contact of inserting.
The present invention has realized that thin-wall case can bear higher stage separation impulsive load, transverse acceleration, simultaneously the light requirement of quality.Under the little prerequisite of radial space, solved a connection sealing difficult problem of dividing piece housing.Reduce the thin-wall case distortion, guaranteed that heat insulation layer is press-fitted the into smooth implementation of afterburning chamber housing, solved the difficult problem of technology capability, reduced cost.
As Fig. 5, Fig. 6, Fig. 7:
Four outer chord ear 2d of central angles such as described afterburning chamber housing 2 rear ends distribution, outer chord ear 2d comprises ear body 2d1, blasting bolt mounting hole 2d5 is arranged on the ear body 2d1, the stiffening rib 2d2 of ear body 2d1 both sides, there is absorbing groove 2d3 the root ear body 2d1 of chord ear 2d and stiffening rib 2d2 junction outside, and stiffening rib 2d2 goes up lightening hole 2d4.
The ear body 2d1 thickness of slab 6mm of described outer chord ear 2d, the stiffening rib 2d2 thickness of slab 5mm of both sides; The wide 5mm of described absorbing groove 2d3, dark 10mm, bottom land is diameter 5mm circular arc.
The outer chord ear end frame thick 10mm of portion of housing.Apart from end face 70mm scope housing wall thickness 4mm.The outer journal stirrup structural parameter of housing are many wheel optimal design results; both guaranteed that the outer journal stirrup of afterburning chamber housing can bear stage separation load; can not transfer loads on the housing thin-walled again, avoid the housing thin-walled to cause moderate finite deformation, protect the heat insulation layer in the afterburning chamber housing.
Four outer chord ear 2d structures need be born about 70KN stage separation load, impulsive load is bigger, and journal stirrup Root Stress maximum, structure are the weakest, require housing journal stirrup place structural strength enough, housing distortion is little, weight also wants light, and structure will satisfy the requirement of body aerodynamic configuration simultaneously.Only consider to increase journal stirrup and frame portion intensity, housing journal stirrup stress can significantly reduce, but housing thin-wall face stress and distortion are all bigger.Analyze from the casing rigidity handling characteristics, journal stirrup is ineffective after stage separation, but housing also need keep sufficient intensity and rigidity to satisfy follow-up usage requirement.The connection journal stirrup that adopts after the optimal design has vibration damping vibration absorbing structure, lightening hole, falls stress absorbing groove, rigidity stiffening rib etc., not only has vibration damping absorbing effect, also has enough intensity and rigidity simultaneously, and has reduced stress and the distortion of thin-wall case.
Have four on afterburning chamber housing 2 outer surfaces for the window seat 2e that is connected with intake duct, four central angles such as window seat distribute.Afterburning chamber is 4 intake duct connecting bases of distribution circumferentially, its structure and dimensional accuracy influence the performance of intake duct, heat insulating construction solidifies the back outside and adopts the structural type that fits into housing, the housing accuracy of form and position is had relatively high expectations, bring big difficulty for design and processing, especially on welded design technology.
Too many because of the boss of afterburning chamber housing 2 outer surfaces welding, and intake duct joint chair, front and back connect journal stirrup and can only be welded structure, and intake duct joint chair, front and back to connect journal stirrup be discontinuous construction, thickness differs greatly.The complexity of afterburning chamber shell construction brings big difficulty for the processing technology of housing, and after heat treatment and machine added, the afterburning chamber housing distortion was big, housing is long again, afterburning chamber heat insulation layer assembling difficulty easily produces stuck phenomenon, and the design proposal of motor afterburning chamber can't be realized.Excessive if rigid assembling heat insulation layer makes to have big additional stress on the heat insulation layer because of the cylinder distortion equally, thus the performance of heat insulation layer performance influenced.
As Fig. 8, Fig. 9, Figure 10, Figure 11:
The front end of gas generator housing 1 is by end socket 6 sealing, establishes internal thread junction surface 1e, diameter successively in gas generator housing 1 front end inboard less than the locating face 1d of thread joint face, the diameter guide ring 1c less than locating face; The locating face 1d coupling of end socket 6 outer flanged surface 6a and gas generator housing 1, the guide ring 1c coupling of flange anchor ring 6b and gas generator housing inboard; The end face of flange 6c of end socket and the coupling of the plane 1f on the gas generator housing, cooperate the plane 1f with end face of flange 6c and gas generator housing to compress by the outside thread junction surface 7a on the swivel nut 7 with internal thread junction surface 1e on the gas generator housing 1, end face of flange design at end socket has seal groove, has the 2nd O RunddichtringO 8 to place closure gasket groove to realize the end face static seal on the both ends of the surface surface of contact.End socket 6 is to become the wall thickness design, and the outer mold surface ellipsoid is than 1.97, and interior profile ellipsoid is than 2.02.
Gas generator housing of the present invention and dock assembly manipulation with instrument room, afterburning chamber housing convenient, simple is beneficial to and guarantees circumferential assembly precision; Gas generator housing design is ingenious, simplify the structure, and is convenient to making, the inspection of powder charge and insulating structure in structural member manufacturing and the convenient slender member.
Claims (8)
1. solid-rocket punching press combined engine housing, comprise gas generator housing (1), it is characterized in that: connect afterburning chamber housing (2) in gas generator housing (1) rear end, gas generator housing (1) with the connection of afterburning chamber housing (2) is: the design of gas generator housing (1) and afterburning chamber housing (2) periphery corresponding etc. four pairs of generator journal stirrups (1a) and the afterburning chamber journal stirrup (2a) of central angle distribution, generator journal stirrup (1a) is connected by bolt, nut (3) with afterburning chamber journal stirrup (2a); Between four pairs of generator journal stirrups (1a) of gas generator housing (1) and afterburning chamber housing (2) periphery and afterburning chamber journal stirrup (2a), design four groups of generator boss (1b) and afterburning chamber boss (2b), locking hole with generator boss (1b) and afterburning chamber boss (2b) coupling is arranged on the wedge shape connecting plate (4), wedge shape connecting plate (4) is pressed into generator boss (1b) and afterburning chamber boss (2b) by this locking hole embedding, with gas generator housing (1) and afterburning chamber housing (2) locking.
2. solid-rocket punching press combined engine housing according to claim 1, it is characterized in that: the two ends of the locking hole of wedge shape connecting plate (4) are wedge surface, namely be interior corner cut at the junction plane with generator boss (1b) outside, be top rake β, β=8 °～13 °, the locking hole of wedge shape connecting plate (4) is corner cut outside the junction plane with afterburning chamber boss (2b) outside is, i.e. back rake angle θ, θ=-2 °～-7 °; The peripheral side of the locking hole of wedge shape connecting plate (4) and generator boss (1b) and afterburning chamber boss (2b) adopts Spielpassung, and the two ends wedge surface is the interference drive fit.
3. solid-rocket punching press combined engine housing according to claim 1 and 2, it is characterized in that: central angles such as afterburning chamber housing (2) rear end distribution four outer chord ears (2d), outer chord ear (2d) comprises ear body (2d1), blasting bolt mounting hole (2d5) is arranged on the ear body (2d1), the stiffening rib (2d2) of ear body (2d1) both sides, the root of chord ear (2d), ear body (2d1) have absorbing groove (2d3) with stiffening rib (2d2) junction outside, and stiffening rib (2d2) is gone up design lightening hole (2d4).
4. solid-rocket punching press combined engine housing according to claim 3 is characterized in that: ear body (2d1) the thickness of slab 6mm of described outer chord ear (2d), the stiffening rib of both sides (2d2) thickness of slab 5mm; The wide 5mm of described absorbing groove (2d3), dark 10mm, bottom land is diameter 5mm circular arc.
5. solid-rocket punching press combined engine housing according to claim 1 and 2, it is characterized in that: the front end of described gas generator housing (1) is sealed by end socket (6), establish internal thread junction surface (1e) successively in gas generator housing (1) front end inboard, diameter is less than the locating face (1d) of thread joint face, diameter is less than the guide ring (1c) of locating face (1d), the flange anchor ring (6a) of end socket (6) outer and the locating face (1d) of gas generator housing (1) coupling, flange anchor ring (6b) mates with the guide ring (1c) of gas generator housing (1) inboard; The end face of flange (6c) of end socket (6) and the plane (1f) of gas generator housing (1) coupling, cooperated with internal thread junction surface (1e) on the gas generator housing (1) by the outside thread junction surface (7a) on the swivel nut (7) plane (1f) of end face of flange (6 c) with gas generator housing (1) compressed, end face of flange (6c) design at end socket has seal groove, has the 2nd O RunddichtringO (8) to place closure gasket groove to realize the end face static seal on the both ends of the surface surface of contact.
6. solid-rocket punching press combined engine housing according to claim 1 and 2 is characterized in that: have four on afterburning chamber housing (2) outer surface for the window seat (2e) that is connected with intake duct, four central angles such as window seat distributions.
7. solid-rocket punching press combined engine housing according to claim 1 and 2, it is characterized in that: described gas generator housing (1) is having sealed groove to place an O RunddichtringO (5) with the thickening of afterburning chamber housing (2) joint and for to inserting structure to the surface of contact of inserting.
8. solid-rocket punching press combined engine housing according to claim 3, it is characterized in that: the front end of described gas generator housing (1) is sealed by end socket (6), establish internal thread junction surface (1e) successively in gas generator housing (1) front end inboard, diameter is less than the locating face (1d) of thread joint face, diameter is less than the guide ring (1c) of locating face (1d), the flange anchor ring (6a) of end socket (6) outer and the locating face (1d) of gas generator housing (1) coupling, flange anchor ring (6b) mates with the guide ring (1c) of gas generator housing (1) inboard; The end face of flange (6c) of end socket (6) and the plane (1f) of gas generator housing (1) coupling, cooperated with internal thread junction surface (1e) on the gas generator housing (1) by the outside thread junction surface (7a) on the swivel nut (7) plane (1f) of end face of flange (6 c) with gas generator housing (1) compressed, end face of flange (6c) design at end socket has seal groove, has the 2nd O RunddichtringO (8) to place closure gasket groove to realize the end face static seal on the both ends of the surface surface of contact.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310156772.XA CN103244309B (en) | 2013-04-28 | 2013-04-28 | A kind of solid-rocket punching press combined engine housing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310156772.XA CN103244309B (en) | 2013-04-28 | 2013-04-28 | A kind of solid-rocket punching press combined engine housing |
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| CN103244309A true CN103244309A (en) | 2013-08-14 |
| CN103244309B CN103244309B (en) | 2016-01-20 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758663A (en) * | 2014-01-20 | 2014-04-30 | 西北工业大学 | Rocket-based combined cycle ejector mode performance test engine |
| CN105156230A (en) * | 2015-07-12 | 2015-12-16 | 杜善骥 | Working method of Laval nozzle effect stacking ram rocket |
| CN105626311A (en) * | 2016-03-03 | 2016-06-01 | 中国航天科工集团第六研究院四十一所 | Pin connection structure for metal shell of solid rocket engine |
| CN107795409A (en) * | 2017-06-09 | 2018-03-13 | 胡建新 | A kind of solid rocket ramjet gas flow adjusting means |
| CN108569422A (en) * | 2018-02-11 | 2018-09-25 | 浙江兆华机械制造有限公司 | A kind of rocket segmental structure |
| WO2019000932A1 (en) * | 2017-06-28 | 2019-01-03 | 北京蓝箭空间科技有限公司 | Inter-stage segment structure for carrier and carrier |
| CN109352273A (en) * | 2018-11-05 | 2019-02-19 | 首都航天机械有限公司 | One kind detecting coordination approach with interface for the assembly of lifting lug high-precision |
| CN109736969A (en) * | 2018-12-11 | 2019-05-10 | 上海新力动力设备研究所 | A kind of solid propellant rocket spinning shell of part convex |
| CN110076259A (en) * | 2019-05-29 | 2019-08-02 | 湖北三江航天江北机械工程有限公司 | The processing method of airborne pencil rocket burning chamber shell |
| CN115095451A (en) * | 2022-08-29 | 2022-09-23 | 北京凌空天行科技有限责任公司 | Spray pipe device |
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| US4766726A (en) * | 1985-12-27 | 1988-08-30 | Morton Thiokol, Inc. | Segmented case rocket motor |
| US5352312A (en) * | 1989-05-10 | 1994-10-04 | Thiokol Corporation | Method of insulating a rocket motor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758663A (en) * | 2014-01-20 | 2014-04-30 | 西北工业大学 | Rocket-based combined cycle ejector mode performance test engine |
| CN105156230A (en) * | 2015-07-12 | 2015-12-16 | 杜善骥 | Working method of Laval nozzle effect stacking ram rocket |
| CN105626311A (en) * | 2016-03-03 | 2016-06-01 | 中国航天科工集团第六研究院四十一所 | Pin connection structure for metal shell of solid rocket engine |
| CN107795409A (en) * | 2017-06-09 | 2018-03-13 | 胡建新 | A kind of solid rocket ramjet gas flow adjusting means |
| WO2019000932A1 (en) * | 2017-06-28 | 2019-01-03 | 北京蓝箭空间科技有限公司 | Inter-stage segment structure for carrier and carrier |
| CN108569422A (en) * | 2018-02-11 | 2018-09-25 | 浙江兆华机械制造有限公司 | A kind of rocket segmental structure |
| CN109352273A (en) * | 2018-11-05 | 2019-02-19 | 首都航天机械有限公司 | One kind detecting coordination approach with interface for the assembly of lifting lug high-precision |
| CN109736969A (en) * | 2018-12-11 | 2019-05-10 | 上海新力动力设备研究所 | A kind of solid propellant rocket spinning shell of part convex |
| CN110076259A (en) * | 2019-05-29 | 2019-08-02 | 湖北三江航天江北机械工程有限公司 | The processing method of airborne pencil rocket burning chamber shell |
| CN115095451A (en) * | 2022-08-29 | 2022-09-23 | 北京凌空天行科技有限责任公司 | Spray pipe device |
| CN115095451B (en) * | 2022-08-29 | 2022-12-20 | 陕西凌空科技有限公司 | Spray pipe device |
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|---|---|
| CN103244309B (en) | 2016-01-20 |
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