CN102121482A - Nozzle-adjustable steam ejector - Google Patents

Nozzle-adjustable steam ejector Download PDF

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Publication number
CN102121482A
CN102121482A CN 201110027632 CN201110027632A CN102121482A CN 102121482 A CN102121482 A CN 102121482A CN 201110027632 CN201110027632 CN 201110027632 CN 201110027632 A CN201110027632 A CN 201110027632A CN 102121482 A CN102121482 A CN 102121482A
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China
Prior art keywords
nozzle
chamber
steam
cone
ejector
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CN 201110027632
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Chinese (zh)
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CN102121482B (en
Inventor
孙家喜
张亚锋
葛高勇
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双良节能系统股份有限公司
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Publication of CN102121482A publication Critical patent/CN102121482A/en
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Abstract

The invention relates to a nozzle-adjustable steam ejector, which comprises a nozzle (6), a power steam chamber (7), an injection chamber (10), a mixing chamber (11), a pressure expansion chamber (12), an adjusting cone (2) and an adjusting cone positioning nut (4), wherein the power steam chamber (7), the injection chamber (10), the mixing chamber (11) and the pressure expansion chamber (12) are connected sequentially along the axial direction; the nozzle (6) transversely passes through the power steam chamber (7) and then enters the injection chamber (10); the end of the nozzle outside the power steam chamber (7) is flange-shaped; the nozzle (6) is connected with the power steam chamber (7) through a positioning bolt (5) and a positioning nut (18); a hand wheel (1) is arranged at one end of the adjusting cone (2); the cone-shaped end of the adjusting cone (2) passes through a nozzle flange; and the adjusting cone (2) is fixed with the nozzle flange together through the adjusting cone positioning nut (4) and an adjusting cone positioning bolt (20). In the invention, the optimal injection performance, namely the minimum power steam consumption designed for the ejector can be achieved.

Description

喷嘴可调式蒸汽喷射器 Adjustable steam ejector nozzle

技术领域 FIELD

[0001] 本发明涉及一种蒸汽喷射器。 [0001] The present invention relates to a steam injector. 属于喷射器技术领域。 It belongs to the technical field of the injector. 背景技术 Background technique

[0002] 一般蒸汽喷射器由喷嘴、引射室、混合室及扩压室四部分组成。 [0002] Usually the steam injector consists of four nozzles, ejector chamber, the mixing chamber and diffuser chambers. 其工作原理为:动力蒸汽进入喷嘴进行绝热膨胀并在喷嘴出口处形成超音速流,在引射室内高速气流带动引射蒸汽沿喷射器轴向流动,在混合室内两股蒸汽混合速度降低到音速以下,在扩压室内混合蒸汽流速降低压力升高,达到排出蒸汽所需参数。 Its working principle is: the motive steam into the nozzle for adiabatic expansion and forming a supersonic flow at the nozzle outlet, in the steam ejector driven ejector axial flow chamber in the high velocity gas ejector, to decrease the speed of sound in the mixing chamber two streams of steam mixing speed hereinafter, the diffuser mixing chamber to reduce the flow rate of the vapor pressure increases, exhaust steam parameters to achieve desired. 引射蒸汽与动力蒸汽质量流量的比值被称为引射系数,其为衡量喷射器性能优劣的主要指标。 Steam ejector motive steam mass flow ratio is referred to as entrainment coefficient, the main injector performance indicators to measure merits.

[0003] 在外部蒸汽参数确定的情况下,喷射器各个结构参数随之确定。 [0003] In the case of external steam parameters determined, along with the respective structural parameters of the injector is determined. 实际工业生产中外部蒸汽参数的变化,特别是在排出蒸汽流量大幅变化的情况下,喷射器的引射性能变化剧烈,无法达到喷射器所设计的最佳引射性能即最小的动力蒸汽耗量。 Practical commercial variation outside steam parameters, in particular in the case of substantial changes in the discharge flow rate of the steam, the performance of the ejector ejector severe fluctuations, the injector can not achieve the best designed ejector performance i.e. minimal motive steam consumption .

发明内容 SUMMARY

[0004] 本发明的目的在于克服上述不足,提供一种达到喷射器所设计的最佳引射性能即最小的动力蒸汽耗量的喷嘴可调式蒸汽喷射器。 [0004] The object of the present invention is to overcome the above disadvantages, to provide an injector designed to achieve optimal performance ejector i.e. the minimum power consumption of the steam nozzle adjustable steam injector.

[0005] 本发明的目的是这样实现的:一种喷嘴可调式蒸汽喷射器,所述蒸汽喷射器包括喷嘴、动力蒸汽室、引射室、混合室、扩压室、调节锥和调节锥定位螺母;所述动力蒸汽室、引射室、混合室和扩压室依次沿轴向连接,所述喷嘴横穿过动力蒸汽室进入引射室,且喷嘴圆形喉部与引射室锥形出口处于同一轴线上,喷嘴中部开设蒸汽进口,其将动力蒸汽室与喷嘴联通;所述喷嘴采用分段设计,一段为喷嘴出口部分,一段为喷嘴尾部,喷嘴上开设多个圆孔,喷嘴调节范围内这些圆孔始终处于动力蒸汽室内,动力蒸汽室外喷嘴端部为法兰状, 喷嘴通过定位螺栓和定位螺母与动力蒸汽室连接;所述调节锥一端安装手轮,锥形的一端横穿过喷嘴法兰,所述调节锥通过调节锥定位螺母和调节锥定位螺栓与喷嘴法兰固定在一起。 [0005] The object of the present invention is implemented as follows: A nozzle adjustable steam injector, the steam injector includes a nozzle, a power steam chamber, the ejector chamber, the mixing chamber, the diffuser chamber, adjusting cone and cone positioning adjustment nut; the power steam chamber, the ejector chamber, the mixing chamber and a diffuser chamber in turn axially connected across the power nozzle of the steam chamber into the ejector chamber, and the nozzle throat and the circular cone ejector chamber at the outlet on the same axis, the central open vapor inlet nozzle, which nozzle chamber and the motive steam Unicom; using the nozzle segment design, the outlet section of the nozzle section, the tail section of the nozzle, the nozzle defines a plurality of circular holes, nozzle adjustment the circular hole is always in the range of power steam chamber, the steam powered outdoor flange-shaped end of the nozzle, the nozzle connected by bolts and nuts positioned motive steam chamber; adjusting cone mounted at one end of the hand wheel, across the tapered end through the nozzle flange, by adjusting the regulator cone cone cone positioning adjustment nut and set screw together with the nozzle flange.

[0006] 本发明是通过改变蒸汽喷射器喷嘴内部结构、喷嘴与其它结构的位置关系来实现对喷射器性能的调节作用。 [0006] The present invention is achieved the regulation of the performance of the injector by varying a positional relationship between the steam injector nozzle internal structure, and other structures of the nozzle.

[0007] 本发明喷嘴可调式蒸汽喷射器具有以下优点: [0007] The nozzle of the invention the adjustable steam injectors will have the following advantages:

1、可在线调整喷嘴与混合室入口之间距离,改善了蒸汽喷射器的性能。 1, can adjust the distance between the line inlet nozzle and the mixing chamber, the improved performance of the steam ejector. 使喷射器可以在较宽的操作范围内仍保持最佳工作性能。 So that the injector can still maintain optimal performance over a wide operating range. 从而达到了节约动力蒸汽,降低系统能耗的目的。 So as to achieve the purpose of saving power of steam to reduce system power consumption.

[0008] 2、可调喷嘴喉部面积起到维持动力蒸汽压力和调整动力蒸汽用量的作用。 [0008] 2, functions to maintain the adjustable nozzle throat area and motive steam pressure steam amount adjusting power effect. 可以替代动力蒸汽管路上的流量调节阀。 May alternatively motive steam pipe line flow regulating valve.

[0009] 3、喷嘴内部设置多孔定位支撑板,确保调节锥与喷嘴喉部同轴,防止了蒸汽流量发生波动时调节锥发生震动,改善了喷嘴内部蒸汽流动的稳定性。 [0009] 3, is positioned inside the nozzle a perforated support plate, to ensure a coaxial nozzle throat adjusting cone and prevented adjusting cone vibration occurs steam flow fluctuations, improves the stability of the vapor flow inside the nozzle.

[0010] 4、结构简单,加工制作成本低,安装、拆卸简便。 [0010] 4, simple structure, low cost manufacture, install, and easy disassembly. 附图说明 [0011] 图1为本发明喷嘴可调式蒸汽喷射器结构示意图。 BRIEF DESCRIPTION [0011] FIG. 1 is a schematic structure of the steam injector nozzle of the present invention is adjustable. [0012] 图2为本发明的多孔定位支撑板结构示意图。 [0012] positioning the porous support structure 2 a schematic view of the plate of the present invention. [0013] 图3为图2的侧视图。 [0013] FIG. 3 is a side view of FIG. [0014] 图4为本发明的喷嘴局部结构示意图。 A partial schematic view of the nozzle structure [0014] FIG. 4 of the present invention. [0015] 图5为图4的侧视图。 [0015] FIG. 5 is a side view of FIG. [0016] 图6为本发明的调节锥定位螺母结构示意图。 [0016] FIG. 6 is a schematic view of a nut structure of the invention positioned taper adjustment. [0017] 图7为图6的侧视图。 [0017] FIG. 7 is a side view of FIG. [0018] 图8为本发明的定位螺栓固定件结构示意图。 Fixing bolts schematic structure [0018] FIG. 8 of the present invention. [0019] 图9为图8的侧视图。 [0019] FIG. 9 is a side view of FIG. 8. [0020] 图中附图标记: [0020] The reference numerals in FIG:

手轮1、调节锥2、定位螺栓固定件3、调节锥定位螺母4、定位螺栓5、喷嘴6、蒸汽进口6-1、动力蒸汽室7、动力蒸汽进口8、密封垫9、引射室10、混合室11、扩压室12、引射蒸汽进口13、多孔定位支撑板14、密封圈15、紧固螺栓16、密封圈17、定位螺母18、密封圈19、调节锥定位螺栓20。 Hand wheel 1, regulating cone 2, the positioning bolts fixing member 3, the positioning adjustment nut cone 4, bolts 5, 6 of the nozzle, steam inlet 6-1, motive steam chamber 7, the motive steam inlet 8, the gasket 9, the ejector chamber 10, the mixing chamber 11, the diffuser chamber 12, steam ejector inlet 13, positioning the porous support plate 14, sealing ring 15, the fastening bolt 16, the sealing ring 17, a positioning nut 18, the sealing ring 19, adjusting bolts 20 cone.

具体实施方式 Detailed ways

[0021] 参见图1,图1为本发明喷嘴可调式蒸汽喷射器结构示意图。 [0021] Referring to Figure 1, a schematic diagram of FIG 1 the steam injector nozzle Adjustable structural invention. 由图1可以看出,本发明喷嘴可调式蒸汽喷射器,包括喷嘴6、动力蒸汽室7、引射室10、混合室11、扩压室12、调节锥2和调节锥定位螺母4,所述动力蒸汽室7、引射室10、混合室11和扩压室12依次沿轴向连接,其中动力蒸汽室7与引射室10采用法兰和紧固螺栓16固定连接,其它均为焊接。 As can be seen from Figure 1, the adjustable nozzle of the present invention, a steam ejector 6 comprises a nozzle, the motive steam chamber 7, the ejector chamber 10, mixing chamber 11, the diffuser chamber 12, regulator cone adjusting cone positioning nut 2 and 4, the said motive steam chamber 7, the ejector chamber 10, mixing chamber 11 and diffuser chamber 12 in the axial direction are sequentially connected, wherein the motive steam ejector chamber 7 and the chamber 10 is fixedly connected to the flange 16 and fastening bolts, welding others are . 所述喷嘴6横穿过动力蒸汽室7进入引射室10,且喷嘴6圆形喉部与引射室10锥形出口处于同一轴线上。 The nozzle 6 crosses the motive steam ejector chamber 7 enters the chamber 10, and the circular nozzle throat 6 and the ejector outlet chamber 10 is tapered on the same axis. 喷嘴6中部开设蒸汽进口6-1,其将动力蒸汽室7与喷嘴6联通,如图4和图5。 6 defines the central vapor inlet nozzle 6-1, which motive steam chamber 6 and the nozzle 7 Unicom, Figures 4 and 5. 喷嘴6与动力蒸汽室7和引射室10之间采用密封圈17和密封圈15密封。 6 nozzle 7 between the power chamber and the vapor chamber 10 and the ejector 17 using the sealing ring 15 and sealing ring. 喷嘴6采用分段设计,一段为喷嘴出口部分,一段为喷嘴尾部。 6 using the nozzle segment design, the outlet section of the nozzle section, the tail section of the nozzle. 喷嘴6内设置多孔定位支撑板14,如图2和图3所示。 6 positioned within the nozzle a perforated support plate 14, as shown in FIGS. 2 and 3. 多孔定位支撑板14设置在所述喷嘴6中部,采用焊接连接。 Positioning the porous support plate 14 is provided in the middle of the nozzle 6 is connected by welding. 喷嘴上开设多个圆孔,喷嘴调节范围内这些圆孔始终处于动力蒸汽室7内,动力蒸汽通过这些圆孔进入喷嘴6中。 Defines a plurality of circular holes on the nozzle, the nozzle adjustment will always be in the range of circular holes motive steam chamber 7, motive steam into the nozzle 6 through the circular holes. 动力蒸汽室7外喷嘴端部为法兰状,两根定位螺栓5将喷嘴6与动力蒸汽室7连接在一起。 Dynamic vapor chamber outer end of the nozzle portion 7 of the flange-like, two bolts 5 with a nozzle 6 is connected to the motive steam chamber 7. 定位螺栓5上喷嘴法兰两侧各设置一个定位螺母18,调整定位螺母18的位置便将喷嘴出口拉近或推离混合室11入口位置。 A nozzle positioned on both sides of the flange bolts 5 are each a positioning nut 18 is provided to adjust the position of the positioning nut 18 put closer or away from the nozzle outlet 11 of the mixing chamber inlet position. 定位螺栓5顶部设置定位法兰,防止螺栓发生偏移而卡死喷嘴。 Top locating flange bolts 5 is provided to prevent the bolt jamming nozzle shifted. 所述调节锥2—端安装手轮1,锥形的一端横穿过喷嘴法兰和喷嘴内设置的多孔定位支撑板14。 The regulator cone 1 2- handwheel mounted end, the tapered end of the nozzle across the positioning flange and the porous support plate 14 disposed within the nozzle. 调节锥2与喷嘴6之间采用密封圈19密封,防止动力蒸汽外漏。 Regulation cone 2 and the nozzle 19 using a seal ring between 6 to prevent leakage of steam power. 所述调节锥定位螺母4通过两根调节锥定位螺栓20与喷嘴法兰固定在一起,如图6和图7。 Positioning the adjusting nut tapered cone 4 by two adjusting bolts 20 and the nozzle flange secured together, as shown in FIGS. 6 and 7. 通过旋转手轮可以实现调节锥的锥形端在喷嘴喉部的伸缩,从而来调节改变喷嘴喉部面积的作用。 It may be implemented telescopically adjustable cone tapered end of the nozzle throat by rotation of the handwheel, thereby changing the effect of adjusting the nozzle throat area.

[0022] 图8为本发明的定位螺栓固定件结构示意图。 Fixing bolts schematic structure [0022] FIG. 8 of the present invention. 图9为图8的侧视图。 9 is a side view of FIG. 8.

[0023] 本发明的动力蒸汽由动力蒸汽室7侧向的动力蒸汽进口8进入,通过喷嘴上的蒸汽进口6-1进入喷嘴6,在喷嘴的出口处蒸汽速度达到最大,带动由引射蒸汽进口13进入的 [0023] The present invention motive steam into the steam inlet 7 by the power of motive steam side chamber 8 through the steam inlet on the nozzle 6-1 into the nozzle 6, the steam velocity at the nozzle exit is maximized, promote the steam emitted by the primer 13 import entry

4蒸汽沿喷射器轴向流动,在混合室11内两股蒸汽充分混合,在扩压室12出口达到蒸汽排出参数。 Steam ejector 4 along the axial flow, the two strands of the steam mixed within the mixing chamber 11, the outlet diffuser chamber 12 reaches steam discharge parameters. 根据动力蒸汽进口8处参数,转动手轮1使调节锥2转动,调节锥2经调节锥定位螺母4和密封圈19在喷嘴6内前后运动,从而通过改变喷嘴6喉部面积达到调节动力蒸汽参数。 The parameters of the motive steam inlet 8, turning the handwheel 1 the adjustment cone 2 is rotated, adjusting the adjusted tapered cone 2 and 4 seal positioning nut 19 move back and forth within the nozzle 6, so as to regulate the power by varying the steam nozzle throat area 6 parameter. 改变设置在定位螺栓5上的定位螺母18的位置,喷嘴6经密封圈15和密封圈19沿喷射器轴向作前后运动,从而改变喷嘴6出口与混合室11入口之间的距离达到喷射器最佳引射性能即引射系数最大。 Changing the positioning nut 5 is provided on the position of the positioning bolts 18, the nozzle 6 via the seal ring 15 and the injector 19 in the axial direction back and forth movement, thereby changing the distance between the outlet 6 and the inlet of the mixing chamber 11 reaches the injector nozzle best ejector entrainment ratio i.e. maximum performance.

[0024] 改变排出和引射蒸汽参数的变工况下,重复上述实施方式从而使喷射器在最佳的引射性能下工作。 [0024] changing the discharge steam ejector and parameters varying conditions, the embodiment described above is repeated so that the injectors in optimal performance of the ejector.

Claims (5)

1. 一种喷嘴可调式蒸汽喷射器,其特征在于:所述蒸汽喷射器包括喷嘴(6)、动力蒸汽室(7)、引射室(10)、混合室(11)、扩压室(12)、调节锥(2)和调节锥定位螺母(4);所述动力蒸汽室(7)、引射室(10)、混合室(11)和扩压室(12)依次沿轴向连接,所述喷嘴(6)横穿过动力蒸汽室(7)进入引射室(10),且喷嘴(6)圆形喉部与引射室(10)锥形出口处于同一轴线上,喷嘴(6)中部开设蒸汽进口(6-1),其将动力蒸汽室(7)与喷嘴(6)联通;所述喷嘴(6)采用分段设计,一段为喷嘴出口部分,一段为喷嘴尾部,喷嘴上开设多个圆孔,喷嘴调节范围内这些圆孔始终处于动力蒸汽室(7)内,动力蒸汽室(7)外喷嘴端部为法兰状,喷嘴(6)通过定位螺栓(5)和定位螺母(18)与动力蒸汽室(7)连接;所述调节锥(2) —端安装手轮(1),锥形的一端横穿过喷嘴法兰,所述调节 An adjustable steam injector nozzle, wherein: said steam injector comprising a nozzle (6), the motive steam chamber (7), the ejector chamber (10), the mixing chamber (11), the diffuser chamber ( 12), adjusting cone (2) and cone positioning adjustment nut (4); said motive steam chamber (7), the ejector chamber (10), the mixing chamber (11) and a diffuser chamber (12) in turn connected axially the nozzle (6) crosses the motive steam chamber (7) into the ejector chamber (10), and the nozzle (6) and a circular throat of the ejector chamber (10) is tapered outlet on the same axis, the nozzle ( 6) central steam inlet opening (6-1), which will power the steam chamber (7) and the nozzle (6) Unicom; said nozzle (6) the segment design, the nozzle section is the outlet portion, the tail section of the nozzle, the nozzle and defines a plurality of circular holes, the circular holes of the nozzle is always in the power adjustment range of the steam chamber (7), (7) the outer end of the nozzle portion of the flange-like power to the vapor chamber, the nozzle (6) by bolts (5) and positioning nut (18) and the motive steam chamber (7); said adjusting cone (2) - mounted handwheel end (1), the tapered end of the nozzle across the flange, the adjustment (2)通过调节锥定位螺母(4)和调节锥定位螺栓(20)与喷嘴法兰固定在一起。 (2) secured together by the flange and the nozzle adjusting nut locating cone (4) and adjusting cone bolts (20).
2.根据权利要求1所述的一种喷嘴可调式蒸汽喷射器,其特征在于:所述喷嘴(6)内设置有多孔定位支撑板(14),多孔定位支撑板(14)设置在所述喷嘴(6)的中部,调节锥(2) 锥形的一端横穿过所述多孔定位支撑板(14)。 2. A nozzle adjustable steam injector according to claim 1, further comprising: positioning a support provided with a perforated plate (14), positioning the porous support plate (14) disposed in the said nozzle (6) middle nozzle (6), the adjusting cone (2) the tapered end of the porous positioned across the support plate (14).
3.根据权利要求1所述的一种喷嘴可调式蒸汽喷射器,其特征在于:所述定位螺栓(5) 顶部设置定位法兰。 A nozzle according to claim adjustable steam injector of claim 1, wherein: said bolts (5) disposed at the top locating flange.
4.根据权利要求1所述的一种喷嘴可调式蒸汽喷射器,其特征在于:所述调节锥(2)与喷嘴(6)之间采用密封圈(19)密封。 4. A nozzle adjustable steam injector according to claim 1, wherein: said adjusting (19) using a sealing ring between the cone (2) and the nozzle (6).
5.根据权利要求1所述的一种喷嘴可调式蒸汽喷射器,其特征在于:所述喷嘴(6)与动力蒸汽室(7)和引射室(10)之间采用密封圈(17、15)密封。 A nozzle according to an adjustable steam injector according to claim 1, characterized in that: the use of the sealing ring (17 between said nozzle (6) and the motive steam chamber (7) and ejector chamber (10), 15) sealed.
CN201110027632A 2011-01-26 2011-01-26 Nozzle-adjustable steam ejector CN102121482B (en)

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CN103363280A (en) * 2013-07-10 2013-10-23 西安交通大学 Assembling jet device
CN104075508A (en) * 2014-07-01 2014-10-01 浙江大学宁波理工学院 Ejector capable of automatically regulating area ratio along with condensing temperature and jet type refrigerating machine
CN105311977A (en) * 2014-08-22 2016-02-10 青岛高远热能动力设备有限公司 Linkage-adjustment ejector
CN106838902A (en) * 2016-12-12 2017-06-13 中国航天空气动力技术研究院 A kind of supersonic speed combustion gas injector
CN109701791A (en) * 2018-12-27 2019-05-03 集美大学 A kind of structure of adjustable injector nozzle position

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CN2625828Y (en) * 2003-05-22 2004-07-14 柳运领 Thermodynamic full efficiency autogenous pressure heat exchanger
CN2697567Y (en) * 2004-02-17 2005-05-04 曹振岭 Vapour injection adjustable instant heat exchanger
CN201916260U (en) * 2011-01-26 2011-08-03 双良节能系统股份有限公司 Steam ejector with adjustable nozzle

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US3607635A (en) * 1968-04-10 1971-09-21 Gen Electric Nuclear reactor with variable flow steam circulator
CN2177115Y (en) * 1993-10-10 1994-09-14 贾明浦 Adjustable ratio jet device
US5622655A (en) * 1995-04-10 1997-04-22 Hydro-Thermal Corporation Sanitary direct contact steam injection heater and method
CN2499130Y (en) * 2001-09-13 2002-07-10 四川省科学城高达测控公司 Adjustable steam spray device
CN2625828Y (en) * 2003-05-22 2004-07-14 柳运领 Thermodynamic full efficiency autogenous pressure heat exchanger
CN2697567Y (en) * 2004-02-17 2005-05-04 曹振岭 Vapour injection adjustable instant heat exchanger
CN201916260U (en) * 2011-01-26 2011-08-03 双良节能系统股份有限公司 Steam ejector with adjustable nozzle

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CN102678638A (en) * 2012-05-28 2012-09-19 中国瑞林工程技术有限公司 Adjustable water ejector vacuum pump
CN102678638B (en) * 2012-05-28 2014-12-10 中国瑞林工程技术有限公司 Adjustable water ejector vacuum pump
CN103363280A (en) * 2013-07-10 2013-10-23 西安交通大学 Assembling jet device
CN103363280B (en) * 2013-07-10 2016-06-29 西安交通大学 A kind of assembling ejector
CN104075508A (en) * 2014-07-01 2014-10-01 浙江大学宁波理工学院 Ejector capable of automatically regulating area ratio along with condensing temperature and jet type refrigerating machine
CN105311977A (en) * 2014-08-22 2016-02-10 青岛高远热能动力设备有限公司 Linkage-adjustment ejector
CN105311977B (en) * 2014-08-22 2017-05-31 青岛高远热能动力设备有限公司 Joint debugging formula injector
CN106838902A (en) * 2016-12-12 2017-06-13 中国航天空气动力技术研究院 A kind of supersonic speed combustion gas injector
CN106838902B (en) * 2016-12-12 2019-01-15 中国航天空气动力技术研究院 A kind of supersonic speed combustion gas injector
CN109701791A (en) * 2018-12-27 2019-05-03 集美大学 A kind of structure of adjustable injector nozzle position

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