KR20120102622A - Miniature sludge lance apparatus - Google Patents

Abstract

Miniature sludge lances for steam generators in pressurized water reactors are provided. The sludge lance is configured to enter the steam generator through the inspection opening and has a body sufficiently thin to fit between adjacent tubes. The sludge lance rail has at least two types of nozzle assemblies that can be attached to the sludge lance rail. One nozzle assembly rotates and the other nozzle assembly translates in the vertical direction. A drive assembly, a mounting assembly, an oscillating assembly, and a flow straightener are also provided.

Description

Mini sludge lance unit {MINIATURE SLUDGE LANCE APPARATUS}

Cross Reference of Related Application

This application is filed on Nov. 3, 2009, US Patent Application No. 61 / 257,584, entitled "MINIATURE SLUDGE LANCE APPARATUS", Nov. 6, 2009, US Patent Application No. 61 / 258,794 (name of invention). : "HAMMERHEAD", and US Patent Application No. 61 / 257,597 filed on Nov. 3, 2009, entitled "MINIATURE NOZZLE FLOW STRAIGHTENER FOR 90 DEGREE BEND".

The present invention relates to a cleaning apparatus for a steam generator, and more particularly to a small sludge lance configured to pass between adjacent tubes in a steam generator.

Pressurized water reactors use a steam generator to maintain separation of water passing through the fuel ("first order") and water passing through the electricity generating turbine ("second order"). The steam generator includes an outer shell defining at least one first space, at least one first fluid inlet, at least one first fluid outlet, at least one second fluid inlet, at least one second steam outlet, and the at least one first And a plurality of tubes of substantially uniform size extending and in fluid communication between the fluid inlet and the at least one first fluid outlet. That is, the first order passes through a manifold that divides the first order into a plurality of streams passing through the plurality of tubes. Such a manifold may be located inside or outside the steam generator shell, but is preferably disposed inside the steam generator shell. The second order may also pass through a manifold, or may simply pass through multiple inlets / outlets, but typically through a single inlet and a single outlet. A typical steam generator is cylindrical, about 6 feet high and about 12 feet in diameter.

The tubes are arranged in a substantially regular pattern that extends substantially vertically and has a narrow gap that is substantially uniform between adjacent tubes. Moreover, the tube generally has an overall shape of inverted “U” and is connected to a flat plate having a plurality of openings therethrough. Such a flat plate, or tube sheet, substantially separates the at least one first fluid inlet and the at least one first fluid outlet, together with the other plate, to form the manifold described above. Thus, within the steam generator shell, the tube has a rising side (high temperature) and a falling side (low temperature). There is a gap between these two sides, which is identified as a "tube lane." The steam generator shell has openings at various heights on either side of the tube lane. Generally, the openings are arranged in opposing pairs. A 6 inch diameter through is typical for the opening in the tube lane axis. Since the tube lane is formed by the dome of the U-shaped tube, access to the center of the steam generator is along the tube lane.

In operation, the first order is communicated through the tube and the second order passes the tube. As this operation is made, the secondary water is heated and the primary water is cooled. During operation of the pressurized hard water steam generator, deposits appear on the secondary side as the secondary water changes to steam. Such particulate deposits, or sludges, are deposited on the outer surface of the tube and on the most exposed surface, mainly on top of the tube sheet. Periodic cleaning of the sediment is desired to maintain good heat transfer and water flow in the steam generator. Typical cleaning is performed by spraying high pressure and high volume water jets that flow along the tube lane axis of the steam generator where a wide gap exists. That is, a "lance" configured to spray high pressure water travels through the tube lanes, allowing water to flow generally in the transverse direction (ie, generally perpendicular to the tube lane axis) and downwards between the tubes. Configured to spray. This spray removes most of the sludge from the tube sheet to remove the sludge from the exposed side of the tube. Chemical treatment may proceed prior to washing. However, this cleaning pattern may leave sludge between the dense patterns of the tubes and is less effective at locations away from the tube lanes.

In order to regulate the auxiliary-side water flow pattern in the steam generator, a device called a tube lane block is installed in some steam generators. The tube lane block can prohibit access for equipment cleaning through the 6 inch penetration. Support plate structures (stray rods) located within the tube bundle of the steam generator are other obstacles that can prevent effective cleaning. Due to the various internal physical limitations in the tube lane (which is the area along the centerline of the tube due to the minimum bending radius of the Row 1 tube), the tube sheet leg (high or low depending on the position of the inlet nozzle) may be May not be properly cleaned by conventional lancing equipment mounted in a hand hole. Access to the tube bundles is further limited by the arrangement of blowdown pipes and Tube Lane Blocking Devices (TLBD) located directly along the centerline of the hand holes in the tube lanes.

In addition to the tube lane approach, some steam generators have openings that are small inspection penetrations of about 2 inches in diameter located at various orientations and heights around the steam generator. After entry through the inspection penetration, access is limited by the gap between adjacent tubes. Such openings are generally not used for cleaning because the problem is the precise placement and injection of high pressure cleaning jets and the delivery of high water volumes within confinement and inspection penetrations of adjacent tube spacings. This through portion may be disposed at an angle from the center of the tube lane. Sludge lancing is typically not achieved through these penetrations due to their physical size and location. Thus, the tube lanes in these steam generators are basically inaccessible and are easy to accumulate sludge and debris between TLBDs and below the blowdown pipe. In addition, certain installations are prohibited from hand-lancing with static jets impinging directly on the tube sheet and adjacent steam generator tubes-which can be used through inspection penetrations to clean this area. Limit manual lancing of type. Sludge lancing technicians experience high doses or radiation with equipment that does not provide automated mechanical means of rotation or vibration of high velocity jets down the tube gap.

During steam generator cleaning (tube lane or inspection opening approaching), high pressure and high volume water is sprayed into the steam generator and sprayed transversely to the longitudinal axis of the lance. That is, the water must be redirected 90 degrees to wash between the tubes. The turbulence of the water due to the 90 degree deflection greatly increases the divergence of the existing water jet.

It is an object of the present invention to provide a small sludge lance configured to pass between adjacent tubes in a steam generator.

Cleaning, or “sludge lancing,” of the tube sheet and tube outer surface can be accomplished efficiently and essentially, automatically, through the inspection opening by inserting a cleaning tool or “lance” through an inspection penetration narrower than the tube gap. . Of course, assume that the lance can be aligned with the tube line, and assume that the lance can be positioned to spray a high speed jet generally parallel to the tube sheet. The test fixture lancing system disclosed below has the ability to be automatically indexed for tube bundle spacing, and in one embodiment, simulated jet oscillation features exhibiting a rotation-to-linear motion for a high speed lancing head suspended at the tube sheet level. It includes. Such a system shortens the time required for sludge lancing to lower the radiation dose.

The disclosed and claimed concept generally provides a sludge lance configured to pass through a narrow tube gap. The sludge lance includes a nozzle assembly having a lateral nozzle. Thus, as the nozzle assembly is indexed, ie as it advances by a distance equal to a multiple of the tube gap spacing, fluid may be sprayed through the tube gap that cleans adjacent tubes.

The nozzle assembly preferably includes a plurality of lateral nozzles spaced about the tube gap width. The "lateral nozzle" is configured to spray perpendicular to the longitudinal axis of the sludge lance. That is, as the sludge lance advances between two tube lines, the nozzle sprays laterally, cleaning two lines and more than two lines. In such a structure, the nozzle assembly can index the plurality of tube gaps between the cleaning sprays. For example, if there are three nozzles, the nozzle assembly may spray between the first three tube gaps and then advance / index to the fourth to sixth tube gaps and spray again. Alternatively, regardless of the number of nozzles on the nozzle assembly, the sludge lance can index one tube gap at a time, cleaning each tube gap (excluding the last tube gap) multiple times.

The disclosed and claimed concepts also include segmented rails. The rail forms a passage through which water or other detergent passes before the nozzle assembly. Elliptical shaped water passages and associated end seals allow for high fluid flow. Lower water passages can be balanced against joint load, eliminating the need for internal support structures. The rail also includes a drive shaft configured to move the nozzle assembly. The nozzle assembly is connected to the first end of the rail, which is inserted into the steam generator. A water manifold is connected to the second end of the rail, which second end is maintained outside of the steam generator. Moreover, an oscillation assembly is arranged at the second end of the rail and configured to provide motion to the drive shaft.

On the other hand, it is desirable that as few separate components be inserted into the steam generator as this situation increases the likelihood of accidentally dropping components into the steam generator. Thus, in place of the opposing openings, if there is only one inspection opening, at a certain orientation and height on the steam generator shell, the rail can be essentially as long as the diameter of the steam generator. On the other hand, steam generators are often located in confined spaces in which extended rails cannot be fitted. Therefore, it is preferable that the rail is segmented. That is, a plurality of similar rail assemblies are connected together to form a rail. Rail assemblies may be of uniform length to reduce manufacturing costs, or may have varying lengths, reducing the number of components while still being useful in limited space. For example, five feet, three feet, and two feet of rail assemblies can be used to form a rail having a total length of ten feet, but these rail assemblies provide a six foot space around the steam generator. Can still be manipulated in.

The rail is moved longitudinally by the device assembly. The drive assembly is configured to support and accurately index the rail. The drive assembly is disposed on the mounting assembly connected to the inspection opening. The mounting assembly has an alignment (adjustment) device to properly align the rail in the tube gap between the two lines. Small misalignment adjacent the inspection openings causes the first end of the rail to contact the tube as the rail advances. This is undesirable because movement of the lance can be limited.

Two nozzle assembly embodiments are disclosed herein. Both nozzle assemblies can use the same rail and drive assembly, but each uses a different type of oscillation motion. Thus, the oscillation assembly is slightly different for each embodiment. In one embodiment, the oscillation is simulated by mechanically raising or lowering the nozzle assembly (with a high speed water jet) against the hydrostatic operating pressure developed by the jet geometry.

In another embodiment, the nozzle assembly is configured to rotate over an arc of 180 degrees. Using opposite nozzles this creates a spray that covers 360 degrees. Anti-backlash mechanisms enable accurate nozzle sweep orientation. That is, when the drive shaft is segmented, there is a possibility that the segments cannot maintain their orientation with respect to each other due to tolerances in the connection. This misalignment is noticeable when high pressure water is sprayed. This is a disadvantage because the nozzle assembly must be properly oriented to pass through the tube gap.

In this structure, the small sludge lance provides a fast, accurate and repeatable setup.

The invention will be better understood when reading the following description of the preferred embodiment in conjunction with the accompanying drawings.

1 is an isometric view of a steam generator.
FIG. 2 is a top sectional view of the steam generator of FIG. 1.
3 is a detailed top cross-sectional view of a steam generator showing one embodiment of a small sludge lance.
4 is a detailed side cross-sectional view of a steam generator showing one embodiment of a small sludge lance.
5 is a side cross-sectional view of a portion of the rail.
6 is a side cross-sectional view of one embodiment of a nozzle assembly and a head assembly.
7 is a side cross-sectional view of the rail assembly.
8 is a side cross-sectional view of a portion of an oscillator assembly and a water manifold.
9 is a side cross-sectional view of the second end of the rail assembly.
10 is a side cross-sectional view of the first end of the rail assembly.
11 is a top view of the drive assembly.
12 is a side view of the drive assembly.
13 is a rear end view of the drive assembly.
14 is a schematic side view of the drive assembly.
15 is a detailed side cross-sectional view of the steam generator showing the positioning assembly.
16 is an end view of the nozzle orientation reset device.
17 is a detailed side cross-sectional view of a steam generator showing another embodiment of a small sludge lance.
18 is a detailed side cross-sectional view of the shrinkage assembly. 18A is a detailed side cross-sectional view of the sliding head assembly of FIG. 18.
19 is a detailed side cross-sectional view of another embodiment of a small sludge lance.
20 is a detailed side cross-sectional view of another embodiment of an oscillator assembly.
21 is a detailed side cross-sectional view of the nozzle assembly.
22 is an end view of the flow straightener.
23 is a side view of the mounting assembly.
24 is an end view of the mounting assembly.
25 is a top view of the mounting assembly.

The term " connected " as used herein means interworking between two or more elements, whether direct or indirect, as long as interlocking is made.

As used herein, the term "directly connected" means that the two elements are in direct contact with each other.

As used herein, “fixedly connected” or “fixed” means that the two components are connected to move as if they were one while maintaining a certain orientation with respect to each other. The fixed component may or may not be directly connected.

As used herein, the term "temporarily connected" means that the two components are connected in such a way that the components can be easily separated without damaging the components. "Temporarily connected" components are easily accessible or easy to manipulate. For example, the nut on the exposed bolt is "temporarily connected", but a typical transmission case sealed by a plurality of fasteners is not "temporarily connected".

As used herein, the term "corresponding" means that the two structural components have a size that engages each other with a minimum amount of friction. Thus, the opening corresponding to the member has a size slightly larger than that of the member, so that the member can pass through the opening with minimal friction.

As used herein, "keyed coupling", "keyed socket", "keyed opening", and "keyed end" are two components that are temporarily fixed together. It has a structure. This can be realized by a set screw connection or extension or lug disposed in the bore or passage. The extension and the socket have cross-sectional shapes corresponding to each other, not circular. As such, the extension cannot rotate in the socket. The key elements may have a cross-sectional shape, such as but not limited to a hexagon (eg, a general nut), a "D" shape, or a rectangle. The key connection provides a temporary connection, for example, by welding or gluing, unless otherwise connected, or otherwise difficult to access.

The term "unit" as used herein means that the component is created in a single piece or a single unit. That is, a component comprising pieces that are created separately and joined together in one unit are not "unit" components or "units".

As used herein, the body moving in the " longitudinal direction " means that the body moves in a direction aligned along the longitudinal (longitudinal) axis of the body.

As used herein, the term "operatively engaged" when used in reference to a gear, or other component with teeth, causes the teeth of the gears to engage each other such that the rotation of one gear also rotates the other gear. Means.

1 and 2 show a steam generator 10 associated with a pressurized water reactor (not shown). A more complete description of the steam generator 10 is disclosed in US Patent Application Publication No. 2008/0121194, the contents of which are included in the present invention, and generally, the steam generator 14 defines a closed space 14. Generally cylindrical elongated shell 12, at least one first fluid inlet 16, at least one first fluid outlet 18, at least one second fluid inlet 20, and at least one A plurality of tubes of substantially uniform size extending in fluid communication between the second fluid outlet 22 and the at least one first fluid inlet 16 and the at least one first fluid outlet 18. It includes. Such cylindrical shell 12 is generally oriented to have a longitudinal axis extending substantially vertically. The tube 24 is connected in a sealed manner to the tube sheet 23 which forms part of the manifold in the sealed space separating the fluid inlet 16 and the fluid outlet 18. As shown in FIG. 1, the tube 24 generally follows a path having the shape of an inverted “U”. As shown in FIGS. 2 and 3, the tubes 24 are arranged in a substantially regular pattern with a narrow gap 25 that is substantially uniform between adjacent tubes 24. Tube gap 25 is typically between about 0.29 and 0.41 inches, more typically about 0.33 inches. As also shown, the “U” shape of the tube 24 creates a tube lane 26 that extends across the center of the shell 12. On both sides of the tube lane 26 there is a tube lane access opening 30. Typically, the diameter of the rounded tube lane access opening 30 is typically between about 5 and 8 inches, more generally about 6 inches. Moreover, the shell 12 has at least one inspection opening 32 disposed adjacent the plurality of tubes 24 that is not aligned with the tube lane 26. In general, the round inspection opening 32 generally has a diameter between about 1 and 1/2 to 4 inches, and more generally about 2 inches in diameter. The tube lane access opening 30 and inspection opening 32 may be located at a plurality of heights of the shell 12.

During operation of the pressurized water reactor, the primary water from the reactor passes through the tube 24 through at least one first fluid inlet 16 and is removed from the steam generator 10 through at least one first fluid outlet 18. do. The second order water enters the steam generator 10 through at least one second fluid inlet 20 and exits the steam generator 10 through the at least one second steam outlet 22. As the second order passes through the outer surface of the tube 24, the second order is converted to steam so that sludge between the tubes 24, on the tube sheet 23 and on other structures of the steam generator 10. (sludge) is left. In general, access to a full sized sludge lance (not shown) is through the tube lane access opening 30.

As shown in FIGS. 3 and 4, the small sludge lance 50 includes a mounting assembly 52, a drive assembly 54, an elongated rail 56, a nozzle assembly 58, and an oscillator assembly 60 (preferred). It is included. The small sludge lance 50 has a structure that, unlike the full-size sludge lance, is inserted into the steam generator 10 through the inspection opening 32. Moreover, the portion of the small sludge lance 50 that enters the steam generator 10, ie the rail 56 and the nozzle assembly 58, is sized to pass between the adjacent tubes 24, that is, the tube gap 25. It has a size to pass through.

Mounting assembly 52 has a structure for supporting drive assembly 54 and rail 56. The drive assembly 54 has a structure for moving the rail 56 through the inspection opening 32. Moreover, drive assembly 54 is connected to mounting assembly 52. The rail 56 has a body 70 and a drive shaft 72 (FIG. 5). The rail body 70 has a first end 74 and a second end 76. In general, as used herein, the first end 74 of the rail body is the end that moves into the steam generator 10. As shown in FIG. 5, the rail body 70 is sized to pass between adjacent tubes 24, as described above. The rail body 70 forms a water passage 78 and a drive shaft passage 80. The drive shaft 72 is rotatably disposed in the drive shaft passage 80. The rail body 70 is movably connected to the drive assembly 54. The water passage 78 of the rail has a structure in fluid communication with a water source (not shown), which is typically a high pressure water source. The water may comprise a cleanser, or the fluid may be a cleanser. As used herein, “water” means the fluid used to clean the tube 24.

As shown in FIG. 6, the nozzle assembly 58 has body assemblies 400, 500 (FIG. 19) that are sized to pass between adjacent tubes 24. Body assemblies 400 and 500 of the nozzle assembly also form a water passage 401. The body assemblies 400, 500 of the nozzle assembly are connected to the rail body 70 using the body assembly water passage 401 of the nozzle assembly in fluid communication with the water passage 78 of the rail body. In this configuration, as the rail body 70 moves through the inspection opening 32, the nozzle assembly 58 passes between the adjacent tubes 24. Since the nozzle assembly 58 passes between the adjacent tubes 24 and one use of the small sludge lance 50 is to wash a plurality of tubes, the water is generally transverse, i.e. the length of the rail 56 Sprayed in a direction generally perpendicular to the direction axis. More preferably, the water is sprayed at a slight downward slope to impinge the sludge over the tube sheet 23. Accordingly, the body assemblies 400, 500 of the nozzle assembly preferably have an elongate shape and include at least two lateral nozzles 600. The at least two lateral nozzles 600 are longitudinally spaced apart from each other on the body assemblies 400, 500 of the nozzle assembly, and the nozzles 600 are substantially the same distance between the centerlines of two adjacent tubes 24. That is, it is more preferred that they are spaced apart by equal distances between the centerlines of adjacent tube gaps 25). Moreover, nozzle assembly 58 may include four nozzles 600, which nozzles 600 are arranged in opposing pairs. In this structure, the paired nozzles 600 face in substantially opposite directions. Thus, water is sprayed in two directions. The nozzle assembly 58 may be located in and act on different tube gaps 25. That is, the nozzle assembly 58 can spray high pressure water through the tube gap 25, thus allowing the tube 24 immediately adjacent to the nozzle assembly 58 and the tubes 24 in various lines beyond it. Can be washed

The small sludge lance 50 may utilize at least two types of nozzle assemblies 58. Each nozzle assembly 58, ie, the rotating nozzle assembly 58A and the vertical reciprocating nozzle assembly 58B (FIG. 19), is shown in detail below. Each type of nozzle assembly 58A, 58B has an associated oscillator assembly 60A, 60B. The remaining components of the small sludge lance 50 can be used with any nozzle assembly 58. Thus, the following description will first address common components and then discuss two types of nozzle assemblies 58A and 58B.

As described above, the rail 56 has a body 70 and a drive shaft 72. The rail body 70 has a first end 74 and a second end 76. The rail body 70 is substantially rigid. The rail body 70 is sized to pass between adjacent tubes 24. The corners of the rail body 70 may be chamfered to reduce the chance of sharp edges in contact with the tube 24. The rail body 70 preferably has a rectangular cross-sectional shape having a height greater than the width. In this structure, the water passage 78 of the rail main body is larger than other shapes (for example, circular cross sections), so that a sufficient amount of water can be provided. It is also preferred that the water passage 78 of the rail body has an elliptical cross-sectional shape. In this configuration, there is less turbulence as water enters the nozzle assembly 58. The drive shaft passage 80 of the rail body is generally circular. Drive shaft 72 is generally circular. The drive shaft 72 has a first end 82 (FIG. 6) and a second end 84 (FIG. 8). The first and second ends 82, 84 of the drive shaft are preferably keyed connections (keys and key sockets 134, 136, described below), and as described below, are connected to the keys for key connection. do.

The rail body 70 has a length sufficient to reach all the tubes 24 of the steam generator. Thus, if the diameter of the steam generator shell 12 is 10 feet and all inspection openings 32 have opposing inspection openings 32, the rail body 70 will be about 5 feet long. If the diameter of the steam generator shell 12 is 10 feet and the inspection opening 32 does not have an opposite opening, the rail body 70 will be about 10 feet long.

However, the steam generator 10 is not always disposed in a facility having a gap of 10 feet or more around the steam generator 10. Thus, rail 56 can be segmented. That is, rail 56 may include modular rail assemblies 90 and water manifold 92 as shown in FIGS. 7 and 8. The rail assemblies 90 are connected together and have a structure that is connected to the water manifold 92 to form a rail 56. Thus, the selected component for the rail 56, ie the second end 84 of the drive shaft, is shown as part of the selected assembly. Each rail assembly 90 has a drive shaft segment 4 and an elongated body 96. As before, the body 96 of each rail assembly is elongated and has a first end 98 and a second end 100. Moreover, the body 96 of each rail assembly preferably has a rectangular cross section that forms an elliptical water passage 99 and a generally circular drive shaft passage 101. The body 96 of each rail assembly is sized to pass between adjacent tubes 24.

Moreover, the body 96 of each rail assembly includes a water passage seal 102. The water passage seal 102 of the body of the rail assembly may be disposed on either or both of the ends 98, 100 of the body of the rail assembly, but not at the first end 98 of the body of the rail assembly. It is preferable to arrange. That is, for the body 96 of each rail assembly, there is an associated seal 102 at the first end 98 of the body of the rail assembly. When the body 96 of the rail assembly is connected together as described below, each water passage seal 102 has a structure that is sealingly engaged with the body 96 of an adjacent rail assembly. Each water passage seal 102 is preferably disposed in a recess 104 in the axial face of the first end 74 of the rail body. The seal groove 104 extends around the water passage 78 of the rail body and provides support for the water passage seal 102. Furthermore, seal support frame 106 may be disposed within seal recess 104 to provide additional support for seal 102. Moreover, the body 96 of each rail assembly may have a longitudinal window 108 therein. The longitudinal window 108 is aligned with the drive shaft passageway 101 and provides communication with the drive shaft passageway 101. The longitudinal window 108 can easily manufacture the drive shaft passage 101 (reduces the length that the drive shaft passage 101 must be cut from each end of the body 96 of the rail assembly), and the threaded drive The drive shaft segment 94 can be retained when connecting the shaft segment, allowing the user to observe the drive shaft segment 94 in use.

The body 96 of each rail assembly preferably has a substantially uniform length between about 6.0 and 24.0 inches, more preferably about 10 inches. Preferably, the length of the body 96 of each rail assembly is a multiple of the tube pitch. Accordingly, the rail assemblies 90 can be mixed with each other. That is, for each steam generator 10 model (the tube 24 spacing is substantially uniform), the body 96 of the rail assembly is the sprocket hole 200 described below, when the length is a multiple of the tube pitch. And the spacing of positioning indicia 308 is evenly spaced on the body 96 of each level assembly. Alternatively, the body 96 of the rail assembly may be sized to fit within the facility in which the steam generator 10 is located, while the number of body 96 of the rail assembly required to extend between the steam generators 10. The body 96 of the rail assembly may have different lengths in a size to minimize it. For example, in the case of the steam generator 10 with a diameter of 10 feet, the body 96 of the rail assembly may have a length of 5 feet, 3 feet, and 2 feet.

As shown in FIG. 8, the water manifold 92 has a structure in fluid communication with a water supply source (not shown), in particular, a high pressure water supply source (not shown). The water manifold 92 has a drive shaft segment 110 and a body 112. The body 112 of the water manifold has a first end 114 and a second end 116. The body 112 of the water manifold has a water passage 118 and a drive shaft passage 120. The first end 114 of the body of the water manifold is connected to the second end 100 of the body 96 of the rail assembly disposed at the second end 76 of the rail body. That is, as described above, the second end 76 of the rail body is the end of the rail body 70 located outside of the steam generator 10. Thus, regardless of how many rail assemblies 90 are used to form the rails 56, the water manifold 92 is the body 96 of the rail assembly at the second end 76 of the rail body. Is connected to.

As noted above, drive shaft 72 is a substantially cylindrical elongated body configured to rotate in drive shaft passageway 80. As shown in FIG. 7, when the drive shaft 72 is divided into drive shaft segments 94, the drive shaft segments 94 have a structure that is temporarily fixed to each other by couplings. That is, each drive shaft segment 94 has a first end 130 and a second end 132. The drive shaft segment ends 130, 132 are extensions 134 or sockets 136, and depending on the nozzle assembly 58A, 58B used, the first end 130 of each drive shaft segment is a keyed extension. 134A or a screw extension 134B, and the second end 132 of each drive shaft segment is a keyed socket 136A or a screw socket 136B. Furthermore, as shown in FIG. 8, the drive shaft segment 110 of the water manifold has a first end 140 and a second end 142, depending on the type of drive shaft 72 used. All are keyed extensions 134A or threaded extensions 134B. That is, the first end 140 of the drive shaft segment of the water manifold corresponds to the type of socket 136 of the drive shaft segment in use. When the rail body 70 is segmented, the second end 142 of the drive shaft segment of the water manifold is such that the second end 142 of the drive shaft segment of the water manifold is always the second end ( As located at 76, it is the second end 84 of the drive shaft. Thus, all drive shaft segments 94 and drive shaft segments 110 of the water manifold may be temporarily fixed to each other to form drive shafts 72.

As explained below, the drive shaft 72 is preferably configured to move in the longitudinal direction. As shown in FIGS. 9 and 10, this is aided by at least one bearing 150 disposed between the drive shaft 72 and the drive shaft passageway 80 of the rail body. When the rail body 70 is segmented, at least one bearing 150 is disposed between each drive shaft segment 94 and the drive shaft passage 101 of the body of each rail assembly. More preferably, there are two bearings 150 in the body 96 of each rail assembly, one between each adjacent drive shaft segment end 130, 132. At least one bearing 150 is held in a desired position adjacent each drive shaft segment end 130, 132 by securing the bearing to the body 96 of the rail assembly by a spring pin 153. Moreover, each drive shaft segment 94 includes at least one reducing diameter 152 and preferably includes one decreasing diameter 152 per bearing 150. Each reduced diameter portion 152 forms a channel in which the bearing 150 is disposed. The ends of each reducing diameter 152 prevent the bearing 150 from moving past the reducing diameter 152. Since at least one bearing 150 is fixed in place relative to the body 96 of the rail assembly, this has the effect of trapping the drive shaft segment 94 on the body 96 of the rail assembly. More preferably, the reduced diameter 152 is longer than the associated bearing 150, allowing the drive shaft segment 94 to travel a short distance in the longitudinal direction relative to the body 96 of the rail assembly. Each of the at least one bearing 150 has a predetermined length, and the reduced diameter portion 152 of each drive shaft segment has an axial length that is greater than the length of the at least one bearing 150. With respect to the first embodiment described below, the relative lengths of the bearing 150 and the reducing diameter portion 152 move the drive shaft segment 94 to between about 0.125 inches and 0.375 inches, more preferably about 0.25 inches. Let's do it. In the second embodiment described below, the drive shaft segment 94 is configured to move between about 1.0 inch and 2.0 inch, more preferably about 1.25 inch.

The body 96 of each rail assembly has a connection assembly 160 disposed at each end 98, 100. The connecting assembly 160 of each rail body is substantially identical such that any two rail bodies 70 can be connected to each other. That is, the connection assembly 160 of each rail body has a first component 162 and a second component 163. The first end 98 of the body of each rail assembly has a first component 162 of the connection assembly, and the second end 120 of each rail body has a second component 163 of the connection assembly. Have Thus, the body 96 of the rail assembly can be connected in series. If desired, the first component 162 of each connection assembly is at least one screw fastener 164 and the second component 163 of each connection assembly is at least one threaded bore 166. )All. At least one screw fastener 164 is disposed in an elongated pocket 165 generally extending longitudinally at the first end 98 of the body of the rail assembly. A retaining body 167 is disposed in the elongated pocket 165 and held in place by the spring pin 153. Retainer 167 prevents at least one screw fastener 164 from being removed from elongated pocket 165, reducing the chance of the component entering the steam generator 10.

One nozzle assembly 58A utilizes a head assembly 170 disposed at the first end 74 of the rail body, as shown in FIG. 6. If alternating nozzle assemblies 58A and 58B are not used, elements of head assembly 170 may be integrated into rail body 70. Thus, the components described with respect to the head assembly 170 may also be considered part of the rail body 70. Head assembly 170 is configured to movably support nozzle assembly 58A, as described below. Head assembly 170 has a body 172 having a first end 174 and a second end 176. The body 172 of the head assembly defines a water passage 178, which is elliptical if desired, and a drive shaft passage 180, which is generally circular. The body 172 of the head assembly is sized to pass between adjacent tubes 24. The second end 176 of the body of the head assembly, when assembled, is configured to be connected to the first end 98 of the body 96 of the rail assembly disposed at the first end 74 of the rail. That is, as the water manifold 92 is disposed at the rear end of the rail 56, ie the second end 76, the head assembly 170 is the front end of the rail 56, ie the first end. Disposed at 74. Furthermore, the water passage 178 and the drive shaft passage 180 of the body of the head assembly may include the water passage 78 of the rail body and the drive shaft passage 80 of the rail body, or the water passage of the body of the adjacent rail assembly. 99) and the size, shape, and location of the drive shaft passageway 101 of the body of the rail assembly. Moreover, the water passage seal 102 of the body of the rail assembly is configured to seal against the body 172 of the head assembly. In this structure, the body 172 of the head assembly, the body 96 of the at least one rail assembly, and the body 112 of the water manifold form an elongated rail water passage 78 and a drive shaft passage 80. .

As described above, the rail body 70 or the body 96 of the rail assembly is elongate and, if desired, has a rectangular cross section. Thus, the rail body 70 or the body 96 of the rail assembly has two broad sides (hereinafter lateral side 190 (FIG. 3) and inner side 192 (FIG. 3)) and two narrow transverse sides. 194, 196 (FIG. 4). The lateral side 194 of one rail body has a plurality of sprocket holes 200 (FIG. 5). When the rail 56 is formed from the body 96 of the rail assembly, the sprocket hole 200 maintains a consistent gap across the interface between the body 96 of the adjacent rail assembly. The transverse side 196 of the other rail body is generally smooth, if desired. The sprocket hole 200 is configured to be engaged by the drive assembly 54.

As shown in FIGS. 11-13, the drive assembly 54 has a motor 210, a housing assembly 212, and a non-slip drive 213 and at least one guide surface 216. The non-slip drive 213 may be a gear system or a rack and pinion (not shown), but is not limited thereto and may be the drive sprocket 214 if desired. Motor 210 has an output shaft 218, and motor 218 of the drive assembly is connected to drive sprocket 214. The output shaft 218 is connected to the drive sprocket 214. The at least one guide surface 216 is configured to keep the rail body 70 or the body 96 of the rail assembly in contact with the drive sprocket 214. The rail body 70 or the body 96 of the rail assembly is disposed between the guide surface 216 and the sprocket 214 using a sprocket hole 200 that engages the sprocket pin 215. If desired, the sprocket pins 215 are threaded. The housing assembly 212 of the drive assembly includes an upper case 220 and a lower case 222. The upper case 220 and the lower case 222 are movably connected to each other and configured to translate relative to each other. More preferably, the upper case 220 and the lower case 222 are configured to move over a single axis in substantially the same plane (ie, the upper case 220 and the lower case 222 move over a single axis). Translation in one plane).

As shown in FIG. 14, to achieve this control motion of the upper case 220 and the lower case 222, the housing assembly 212 of the drive assembly includes two elongated guide pin passages 224 and two elongated. Guide pin 226. The guide pin passage 224 extends through both the upper case 220 and the lower case 222. That is, the guide pin passage 224 is branched and aligned on each of the upper case 220 and the lower case 222. The guide pin passageway 224 longitudinal axis is disposed in the same plane and extends substantially parallel to each other. If desired, the guide pin passage 224 includes a linear bearing 225 disposed within the lower case 222 guide pin passage 224. Furthermore, the lower case 222 guide pin passage 224 preferably includes a threaded portion 227 and the guide pin 226 has a corresponding screw 228 such that the guide pin 226 has a corresponding passage 224. To be connected to. The guide pin 226 is preferably disposed in the guide pin passage 224 and connected to the lower case 222.

Moreover, the upper case 220 and the lower case 222 are configured to be biased toward each other. By this bias, components connected to the upper case 220 and the lower case 222 can be coupled with the lateral sides 194, 196 of the rail body 70. This bias may be affected by a device such as a tension spring connected to both the upper case 220 and the lower case 222, but is preferably affected by the bias assembly 230 on one guide pin 226. Guide pin bias assembly 230 includes bias device 232, knob 234, and threaded end 236 on associated guide pin 226. Moreover, the associated guide pin passage 224 has a portion 238 having a wide diameter, and thus, when the guide pin 226 is disposed within the guide pin passage 224 having a portion 238 having a wide diameter. An annular space 240 is created. Guide pin passage 224 having a wide diameter portion 238 is preferably disposed on the upper side of the branched guide pin passage 224. The bias device 232, which is a compression spring 242 if desired, is disposed in the annular space 240. The threaded end 236 of the guide pin is disposed adjacent the upper case 220. That is, the threaded end 236 of the guide pin is in the upper portion of the branched guide pin passageway 224. Knob 234 has a screw opening 244. The knob 234 is disposed on the threaded end 236 of the guide pin. In this structure, the bias device 232 is disposed between the knob 234 and the bottom of the annular space 240. This structure allows the bias assembly 230 to bias the upper case 220 and the lower case 222 toward each other.

In order to achieve the desired effect of the components connected to the upper case 220 and the lower case 222, which engage the lateral sides 194, 196 of the rail body 70, the drive sprocket 214 and the at least one Guide surface 216 should be connected to different portions of housing assembly 212 of the drive assembly. Although the position may be reversed, in the embodiment shown in the figure, the drive sprocket 214 is rotatably connected to the lower case 222 and at least one guide surface 216 is disposed on the upper case 220. In this structure, the drive sprocket 214 and the at least one guide surface 216 engage the opposing transverse sides 194, 196 of the rail body 70. While at least one guide surface 216 may be a cam surface, in a preferred embodiment, at least one guide surface 216 is at least one guide wheel 250 rotatably attached to the upper case 220. For a higher level of control of the rail body 70, at least one guide wheel 250 may have three guide wheels 250. If desired, the guide wheel 250 and the sprocket 214 (not the teeth 215 of the sprocket) have substantially the same diameter. The axes of the three guide wheels 250 and the sprocket 214 are arranged in a substantially regular pattern. This structure effectively creates a longitudinal path through which the rail body 70 passes. When the guide wheel 250 and / or the sprocket 214 have different diameters, the same effect can be obtained by arranging the three guide wheels 250 and the sprocket 214 in a quadrilateral pattern.

The system of the guide wheel 250 is mounted on the cam surface to reduce wear and tear on the sides of the rail body 70 as the guide wheel 250 and the sprocket 214 act repeatedly on the rail body 70. It is desirable to set. Wear and wear can be further reduced by rotating at least one guide wheel 250 perpendicular to the sprocket 214 at the same speed as the sprocket. This is realized by the gear assembly 260 of the drive assembly connected to the sprocket 214 and configured to rotate the at least one guide wheel 250. The gear assembly 260 of the drive assembly includes a first gear 262, a second gear 264, a third gear 266, a fourth gear 268, a first elongated link 270, and a second elongated link. And (272). The first gear 262 is fixed to the sprocket 214 and shares the same axis of rotation. The second gear 264 is fixed to the at least one guide wheel 250. The first link 270 has a first end 274 and a second end 276. The first link 270 is sized to rotatably support the first gear 262, the third gear 266, and the fourth gear 268 in a operatively engaged state. That is, the first link 270 is long enough for the first gear 262, the third gear 266, and the fourth gear 268 to be rotatably mounted, but the first gear 262, the third The gear 266 and the fourth gear 268 are not long enough to fail to engage with each other. The second link 272 has a first end 278 and a second end 280. The second link 272 is sized to support the second gear 264 and the fourth gear 268 in a operatively engaged state. The first end 274 of the first link is rotatably connected to the lower case 222, the axis of rotation corresponding to the axis of rotation of the sprocket 214. The first end 278 of the second link is rotatably connected to the upper case, the axis of rotation corresponding to the axis of rotation of the at least one guide wheel 250. Moreover, the second end 276 of the first link and the second end 280 of the second link are rotatably connected together and share a rotation axis with the fourth gear 268. In this structure, the gear assembly 260 of the drive assembly maintains the gears 262, 264, 266, 268 in operative engagement at the two links 270, 272, and the second end 276, 280 joints. Configured to rotate relative to each other around. The two links 270, 272 rotate relative to each other around the second end 276, 280 joint as the upper case 220 and the lower case 222 move as described above. Thus, in this structure, regardless of the spacing between the upper case 220 and the lower case 222, the sprocket 214 and at least one wheel 250 is to engage the gears (262, 264, 266, 268). Stay connected through

Although drive assembly 54 and elongated rail 56 have been described, rail 56 passes through a path between drive assembly sprocket 214 and guide wheel 250 and rail 56 is rotated by sprocket 214. Can be confirmed. As the motor 210 of the drive assembly rotates the sprocket 214, the rail 54 moves in and out of the steam generator 10. Moreover, when the rails 56 are segmented, the rail assemblies 90 may be attached to each other during the cleaning process. That is, to clean the tube 24 closest to the inspection opening 32, a single rail assembly 90 is connected to the nozzle assembly 58 and to the water manifold 92. The rail 56 then passes through the drive assembly 54, the nozzle assembly 58 is inserted into the steam generator 10 and the tube 24 is cleaned. The water manifold 92 does not pass through the drive assembly 54. Thus, when the tube 24 closest to the inspection opening 32 is cleaned, the water manifold 92 may be detached from the first rail assembly 90, and then the second rail assembly 90 may be the first. It may be connected to the rail assembly 90, and the water manifold 92 is connected to the second rail assembly 90 again. The rail 56 is now longer, and the first end 74 of the rail body can move further into the steam generator 10. This process can be repeated by adding additional rail assemblies 90 until the rails 5 have a length sufficient to extend between the steam generators 10.

However, it is desirable to align the nozzle 600 with the tube gap 25 before the cleaning process takes place. That is, as described above, it is desirable to substantially align the spray with the center of the tube gap 25 in order for the cleaning spray to reach as many tubes 24 as possible. Moreover, because the various inspection openings 32 can be spaced differently from the adjacent tube 214, the position of the tube 24 must be determined before inserting the rail 56 with the nozzle assembly 58. Thus, as shown in FIG. 15, the rail 56 may have a positioning assembly 300 temporarily connected to the rail 56. Positioning assembly 300 includes a body 302, a stop 304, an adjustable pointer assembly 306, and a plurality of indicia 308 (FIG. 4). The body 302 of the positioning assembly has dimensions substantially similar to the body 96 of the rail assembly, but does not include an internal passageway. The body 302 of the positioning assembly is connected to the first end of the rail 56 and becomes the first end 74 of the rail. The stop 304 is connected to the body 302 of the positioning assembly, ie to the first end 74 of the rail. The stop 304 has a size that does not pass between adjacent tubes 24. The adjustable pointer assembly 306 is movably connected to the drive assembly 54 adjacent the rail 56 and is configured to move in a direction substantially parallel to the longitudinal axis of the rail 56. The bow markings 308 are disposed on the rails 56. Indication 308 is preferably a line or line segment extending between the outer surface 190 of the rail body. The marks 308 are spaced apart by multiples of the centerline distance of the tube, preferably with a multiple of one. Moreover, the distance between the stop 304 and the mark 308 is known and when the stop is in contact with the tube 24 the mark is placed at a known distance from the center line of the tube 24 and / or the center line of the tube gap 25. The distance between the stop 304 and the indication 308 is configured to be.

In this structure, the body 302 of the positioning assembly is inserted into the steam generator as described above, but instead of passing between the tubes 24, the stop 304 is the tube 24 closest to the inspection opening 32. Will contact. Thus, the position of the tube 24 closest to the inspection opening 32 can be determined. Once the position of the tube 24 closest to the inspection opening 32 is known, the adjustable pointer assembly 306 is positioned to coincide with one of the marks 308. The adjustable pointer assembly 306 is then temporarily fixed in this position. The rail 56 then exits from the steam generator 10 and a nozzle assembly 58 is attached to the rail 56. Rail 56 is reinserted into steam generator 10 and rail 56 moves until adjustable pointer assembly 306 is aligned with mark 308 again. In such a structure, the nozzle 600 will be disposed substantially at the center line of the tube gap 25. After the cleaning spray has been applied, rail 56 is forwarded until the adjustable pointer assembly 306 is aligned with the next mark 308 indicating that the nozzle 600 is now positioned in the next tube gap 25. It can be indexed (moved). This operation can be repeated until all tube gaps 25 have been cleaned. In the case where the rail 56 includes a plurality of rail assemblies 90, at least one mark 308 includes a plurality of marks 308 disposed on each rail assembly 90.

The adjustable pointer assembly 306 includes an elongated body 312 having an indicator 314 and at least one fastener 310. Moreover, drive assembly 54 includes at least one fastener opening 313 adjacent to rail 56. The body 312 of the adjustable pointer assembly has a longitudinal slot 316 therein. At least one fastener 310 of adjustable pointer assembly 306 is disposed through slot 316 of the body of one adjustable pointer assembly and connects to at least one fastener opening 313 of drive assembly 54. do. Thus, the body 312 of the adjustable pointer assembly is movably connected to the drive assembly 54, can move longitudinally and be temporarily fixed to the drive assembly.

The nozzle assembly 58 includes a nozzle that is essentially fixed, but preferably includes a movable nozzle 600 to increase the effective cleaning area capable of supplying water. The motion of the nozzle 600 is generated by the oscillator assembly 300 (FIG. 1). Oscillator assembly 330 is configured to produce periodic motion and is coupled to drive shaft 72. Thus, the drive shaft 72 also moves periodically. As shown in FIG. 8, the oscillator assembly 330 (FIG. 4) includes a housing assembly 332, a motor assembly 334 (FIG. 1) with an elongated output shaft 336, and a gear assembly 338. Include. The motor assembly 334 of the oscillator assembly is connected to the housing assembly 332 of the oscillator assembly. The motor assembly 334 of the oscillator assembly may include a control assembly 450 and a sensor assembly 452 having an encoder 454 and a mechanical resistance sensor 456, all of which are described in detail and schematically below. Is shown. The motor assembly 334 of the oscillator assembly is configured to rotate the output shaft 336 in two directions. That is, the motor assembly 334 of the oscillator assembly can rotate the output shaft 336 of the motor of the oscillator assembly in two directions.

As mentioned above, the sludge lance 50 must often operate in a tight quaters. As such, although the longitudinal axis of the motor assembly 334 and / or output shaft 336 of the oscillator assembly may be aligned with the longitudinal axis of the drive shaft 72, the oscillator assembly 330 may be driven by the drive shaft 72. It is desirable to extend approximately perpendicular to the longitudinal axis of the to reduce the overall length of the sludge lance 50. Thus, it is preferable that the gear assembly 338 of the oscillator assembly is a meter gear assembly. The gear assembly 338 of the oscillator assembly has a first gear 340, a second gear 342, and a meter gear socket member 343. The gear assembly first and second gears 340, 342 of the oscillator assembly are connected. The first gear 340 is fixed to the output shaft 336 of the motor of the oscillator assembly. The second gear 342 is connected to the meter gear socket member 343 forming the keyed opening 344. That is, in the case of each embodiment of the nozzle assemblies 58A, 58B, the gear assembly 338 of the oscillator assembly has different meter gear socket members 343. The meter gear socket member 343 has a flange 352 that is generally perpendicular to the tubular portion 350. The meter gear socket member tubular portion 350 is disposed in the central opening of the second meter gear 342. The meter gear socket member tubular portion 350 is hollow and forms a keyed socket. The meter gear socket member flange 352 includes a fastener opening 354 that is aligned with the screw bore hole 356 in the second meter gear 342. Instead of using the metric gear socket member 343 to adapt the assembly for use with the two embodiments of the nozzle assemblies 58A, 58B, the second gear 342 is a single nozzle assembly 58A, 58B. It may be formed to have a particular opening (not shown) for use with the. Thus, as used herein, "second keyed opening" means the equivalent structure of a second gear 342 having an associated meter gear socket member 343, or a second gear 342 having a keyed opening.

The second end 84 of the drive shaft extends from the rail body 70 and, as described above, the outer perimeter can be a keyed extension 134 or connected to a key 134 for a keyed opening. That is, in the first embodiment, the second end 84 of the drive shaft is the key, and in the second embodiment, the second end 84 of the drive shaft has a thread and passes through the nut 570. As used herein, the nut 570 is a movable portion of the second end 84 of the drive shaft, such that the structure is the second of the drive shaft being a key having a size corresponding to the metric gear socket member keyed opening 344. Same as end 84.

In the case of the keyed second end 346 of any kind of drive shaft, the drive shaft 72 can move through the keyed opening 344 of the second gear. That is, when there is no thread at the second end 84 of the drive shaft, the second end 84 of the drive shaft, more specifically the keyed second end 84 of the drive shaft, is the keyed opening 344 of the second gear. Sliding through). If there is a thread at the second end 84 of the drive shaft, the drive shaft 72 is moved through the screw collar 570 by the rotation of the threaded collar 570, and the drive shaft 72 is Travel through the keyed opening 344 of the second gear. Thus, the keyed second end 346 of the drive shaft is disposed in the keyed opening 344 of the second gear, and the drive shaft 72 can move axially through the second gear 342.

Both embodiments of nozzle assemblies 58A and 58B include bodies 400 and 500 of elongated nozzle assemblies. As mentioned above, it is preferred that there are at least two lateral nozzles 600. The nozzle 600 is in fluid communication with the water passage 401 of the body of the nozzle assembly, and at least two lateral nozzles 600 are configured to move relative to the rail 56. That is, the main body 400, 500 of the nozzle assembly is connected to the drive shaft 72, and the nozzle main body 400, 500 moves relative to the rail 56 as the drive shaft 72 moves.

In one embodiment, nozzle assembly 58A provides a rotating nozzle 600. That is, as shown in FIG. 6, the body 400 of the nozzle assembly has an elongated, substantially hollow, and substantially linear tube 402, which tube 402 has a first end 404, an intermediate portion. 406, and a second end 408. The main body 400 of the nozzle assembly forms a water passage 401 of the main body of the nozzle assembly. The body 400 of the nozzle assembly is configured to be rotatably connected to the rail 56, or, in the case of a segmented rail, to be rotatably connected to the head assembly 170, and to The second end 408 and the intermediate portion 406 of the body of the nozzle assembly are disposed within the rail body 70 (or within the body 172 of the head assembly), and the first end 404 of the body of the nozzle assembly is Extends from the first end 74 of the rail (or from the first end 174 of the body of the head assembly).

In this embodiment, the nozzle 600 is an extension 403 that is generally perpendicular from the body 400 of the nozzle assembly. It is preferred that there are six nozzles 600, three nozzles 600 extending parallel to one another in a first direction, and three other nozzles 600 extending in opposite directions. The opposing nozzles 600 preferably share substantially the coaxial axis. Moreover, the combined length of the opposing vertical extensions 403 has a larger width than the tube gap 25 for the insertion of the rail 56. Thus, the longitudinal axis of the vertical extension 408 must be oriented in a direction substantially parallel to the longitudinal axis of the tube 25 during insertion of the rail 55 and subsequent longitudinal movements. During cleaning, the body 400 of the nozzle assembly, thus the vertical extension 403, rotates to about 180 degrees to provide a larger cleaning area. That is, the motor assembly 334 of the oscillator assembly is configured to reciprocate the drive shaft 72 as follows. First, the motor assembly 334 of the oscillator assembly moves the drive shaft 72 by about 90 degrees in the first direction. The motor assembly 334 of the oscillator assembly then returns the drive shaft 72 to its original orientation. The motor assembly 334 of the oscillator assembly then moves the drive shaft 72 by about 90 degrees in the second opposite direction. This means that the vertical extension 403 moves over about 180 degrees. During this rotation, the vertical extension 403 rotates into the tube gap 25 between the tubes adjacent to the rail 56. Moreover, the distal end of the body 400 of the nozzle assembly may include a cap 409 that is soft, for example non-metallic. This flexible cap 409 protects the tube 24 from damage if the rail 56 is not properly aligned with the tube gap 25 for insertion. Moreover, the cap 409 preferably has a larger width or diameter than the rail body 70. Therefore, the rail body 70 should be prohibited from moving into a gap narrower than the rail body 70. Moreover, the vertical extension 403 can also include a non-metallic sleeve 411. The sleeve 411 helps protect the tube 24 when the body 400 of the nozzle assembly is not properly aligned with the vertical extension 403 disposed in the tube gap 25.

In the case of this embodiment, the longitudinal axis of the nozzle body 400 is aligned with the drive shaft 72. Thus, the nozzle body 400 is spaced apart from the water passage 78 (or the water passage 178 of the head assembly) of the rail body and will not be in fluid communication. Thus, at the first end 74 of the rail body (or within the head assembly 170), the water passage 78 of the rail body (or the water passage 178 of the head assembly) and the drive shaft passage of the rail body ( There is a first end fluid passageway 410 between 80 (or drive shaft passageway 180 of the head assembly). Moreover, there is at least one fluid port 412 in the middle portion 406 of the body of the nozzle assembly. At least one fluid port 412 of the nozzle assembly is located in the first end fluid passage 410 of the rail body. At least one fluid port 412 is in fluid communication with the water passage 401 of the nozzle body. Accordingly, at least one fluid port 412 communicates fluid between the water passage 78 (or water passage 178 of the head assembly) of the rail body and the water passage 401 of the nozzle body. If desired, the edges of the at least one fluid port 4120 are cut at an angle corresponding to the fluid flow direction to reduce turbulence.

In this structure, the high pressure water is exposed to the drive shaft passage 80. In order to prevent the penetration of water into the drive shaft passage 80, a seal is provided. In particular, the intermediate portion 406 of the body of the nozzle assembly comprises a solid portion 414 disposed between the keyed socket 420 of the second end of the body of the nozzle assembly described below and the water passage 401 of the nozzle body. do. The body 400 of the nozzle assembly includes a seal assembly 416 having a plurality of seals 415. The plurality of seals 415 are disposed around the body 400 of the nozzle assembly and are configured to substantially prevent water from escaping around the body 400 of the nozzle assembly. Seal assembly 416 includes at least a first seal 415A and a second seal 415B. The first seal 415A is disposed immediately adjacent to the first end 74 of the rail body and is configured to prevent water from passing through the first end 74 of the rail body. Bearings can also be arranged in this position. The second seal 415B is disposed around the solid portion 414 of the body of the nozzle assembly and is configured to prevent water from passing through the drive shaft passage 80. The second seal 415B may include a radial channel (not shown) configured to communicate water in the transverse direction. This type of seal 415B requires an outlet passage 418 (FIG. 4) in the body 172 of the head assembly. In such a structure, water forced down the drive shaft passageway 80 may exit the body 172 of the head assembly.

Moreover, the nozzle body 400 can be configured to rotate around the longitudinal axis of the nozzle body, providing a larger coverage area for cleaning spray. If desired, the second end 407 of the body of the nozzle assembly forms a keyed socket 420. Moreover, as described above, the first end 82 of the drive shaft is a key 134. The key 134 at the first end of the drive shaft corresponds to the keyed socket 420 at the second end of the body of the nozzle assembly. Thus, when the nozzle body 400 is partially disposed within the rail body 70 (or the body 170 of the head assembly), the keyed first end 134 of the drive shaft is the keyed socket of the second end of the nozzle body. Temporarily fixed to 420, the nozzle body 400 rotates by the rotation of the drive shaft 72.

There is a potential problem with the body 400 of the nozzle assembly when the rail 56 is formed from the rail assembly 90. That is, as described above, when the particular extension 403 is substantially parallel to the longitudinal axis of the tube 25, the user may move the nozzle body 400 in the steam generator 10 as only the nozzle body 400 moves. The orientation of) must be known. However, when the drive shaft 72 is segmented and connected by the keyed extension 134 and the socket 136, there is a possibility of a "play" of the connection. Each connection has a tolerance, and when the tolerance is multiplied by the number of connections, the effect of the combined tolerance can be very significant. That is, when the second end 84 of the drive shaft is in the original orientation, that is, when the nozzle body 400 is properly aligned during insertion, the vertical extension 403 causes the tube gap 25 by the combined tolerance. May exist within).

To address this problem, the keyed extension 134 and the socket 136 are tapered, and the drive shaft 72 is biased towards the first end 82 of the drive shaft. Keyed extension 134 is shown in FIG. 7A. The keyed socket 136 has a corresponding shape. The keyed socket 136 is tapered and has a major cross-sectional area (large cross-sectional area) immediately adjacent to the drive shaft segment 94 and an auxiliary cross-sectional area (small cross-sectional area) remote from the drive shaft segment 94. Moreover, as described below, the drive shaft 72 is biased towards the first end 82 of the drive shaft by the plunger 434 described below. This bias reduces / controls the “play” between the drive shaft segments 94. To ensure a tight fit between each keyed extension 134 and keyed socket 136, keyed extension 134 can be sharply tapered between 0.0 degrees and 4.0 degrees, and more preferably socket 136 Can be sharpened to about 2.0 degrees. As described above, the drive shaft 72 is configured to slide through the keyed opening 344 of the oscillator assembly second gear as described above, and drive to bias the keyed extension 134 into the keyed socket 136. It is desirable to bias the shaft 72 in the forward direction. As shown in FIG. 8, this is accomplished by a keyed socket insertion assembly 430 on the housing assembly 332 of the oscillator assembly. The keyed socket insertion assembly 430 is configured to engage with the drive shaft 72 and bias the drive shaft 72 toward the first end 74 of the rail body. Keyed socket insertion assembly 430 includes a generally tubular, keyed body 432, plunger 434, bias device 436, and cap 438. The radially outer surface of the body 432 of the keyed socket insertion assembly has a shape corresponding to the keyed opening 344 of the second gear. The body 432 of the keyed socket insertion assembly also has an elongated keyed passage 440. The keyed passage 440 of the body of the keyed socket insertion assembly is configured to correspond to the keyed second end 84 of the drive shaft. The plunger 434 of the keyed socket insertion assembly is disposed in the elongated passage 440 of the body of the keyed socket insertion assembly. A cap 438 of the keyed socket insertion assembly is connected to the body 432 of the keyed socket insertion assembly at the rear end of the elongated passage 440 of the body of the keyed socket insertion assembly. A biasing device 436 of the keyed socket insert assembly, which is preferably a compression spring 437, is disposed between the plunger 434 of the keyed socket insert assembly and the cap 438 of the keyed socket insert assembly and the plunger ( 434 is configured to bias towards the first end 74 of the rail body. Thus, the plunger 434 of the keyed socket insertion assembly engages with the drive shaft 72 to bias the drive shaft 72 toward the first end 74 of the rail body.

As noted above, the vertical extension 403 must be oriented in a direction substantially parallel to the longitudinal axis of the tube 25 during insertion of the rail 56 and during subsequent longitudinal movements. In general, the orientation of the vertical extension 403 is monitored by the motor control assembly 450 (shown schematically in FIG. 1) of the oscillator assembly. That is, the motor control assembly 450 of the oscillator assembly is configured to receive input, generally electronic signal carrying data, from the sensor assembly 452. The sensor assembly 452 (shown schematically in FIG. 1) is a mechanical resistance sensor 456 (shown schematically in FIG. 1) and an encoder 454 (FIG. 1) configured to track the orientation of the drive shaft 72. Schematically shown at 1). The resistance sensor 456 is generally a current sensor that detects the amount of current being used by the motor assembly 334 of the oscillator assembly. Both the encoder 454 and the mechanical resistance sensor 456 generate an input received by the motor control assembly 450 of the oscillator assembly. That is, the motor assembly 334 of the oscillator assembly operates in response to input, for example in response to an input from an operator, and operates to receive input from the encoder 454 and the resistance sensor 456. The encoder 454 is configured to track the position of the gear in the gear assembly 338 of the oscillator assembly and is configured to provide position data to the motor control assembly 450 of the oscillator assembly. As the gear assembly 338 of the oscillator assembly is placed in a relatively fixed orientation relative to the drive shaft 72, the orientation of the drive shaft 72 is also known. The encoder 454 is reset whenever the rail 56 is inserted into the steam generator 10 after the rail body 70 is positioned in the proper orientation. Since the motor control assembly 450 of the oscillator assembly is electronic, the loss of power causes the system to lose track of the orientation of the vertical extension 403. This is undesirable because the longitudinal movement of the rail 56 with the vertical extension 403 in an orientation other than substantially aligned with the longitudinal axis of the tube 24 may damage the tube 24. Thus, nozzle orientation reset device 460 is included in oscillator assembly 330.

The nozzle orientation reset device 460 is configured to position the body 400 of the nozzle assembly of the body, and thus the vertical extension 403 with the nozzle, generally vertically, in a selected orientation. The nozzle orientation reset device 460 includes an end plate 462 and a lug 464 as shown in FIG. 6. End plate 462 is disposed adjacent body 432 of the keyed socket insertion assembly. That is, the end plate 462 is disposed in a plane generally perpendicular to the axis of rotation of the drive shaft 72 adjacent to the body 432 (FIG. 6) of the keyed socket insertion assembly. End plate 462 has an arcuate channel 466. The end plate arcuate channel 466 has a center substantially aligned with the axis of rotation of the drive shaft 72. Lug 464 is disposed on and extends axially from the body 432 of the keyed socket insertion assembly. Lug 464 is sized and positioned to be movably disposed in arcuate channel 466. Thus, as motor assembly 334 of the oscillator assembly is actuated, lug 464 reciprocates in channel 466. The arcuate channel 466 extends over 180 degrees and when the vertical extension 403 is substantially aligned with the longitudinal axis of the tube 24, the lug 464 is positioned substantially center of the channel 466. do.

By moving the lug 464 within the channel 466 until the lug 464 contacts one end on the channel 466, the orientation of the body 400 of the nozzle assembly is reset (ie, the motor of the oscillator assembly). 450 is reset). The motor control assembly 450 of the oscillator assembly is preferably programmed to have data indicating the angle between the end of the channel 466 and the neutral position. When contact is made, the resistance sensor 456 provides position input data to the motor control assembly 450 of the oscillator assembly, and the motor control assembly 450 of the oscillator assembly uses the encoder position data to provide a nozzle, that is, a vertical orientation. Reposition portion 403 to the selected, ie, neutral, orientation.

In the second embodiment shown in FIG. 17, the nozzle assembly 58B is configured to move the nozzle 600 vertically. That is, in the second embodiment, the nozzle assembly 58B includes an elongated body assembly 500 having an elongated first end 502, an intermediate portion 504, and an elongated second end 506. The body assembly intermediate portion 504 of the nozzle assembly is arcuate and preferably extends over an arc of about 90 degrees, and thus, the first end 502 of the body assembly of the nozzle assembly and the second end of the body assembly of the nozzle assembly. 506 are disposed at approximately right angles to each other. The nozzle 600 is disposed at the first end 502 of the body assembly of the nozzle assembly. The nozzle 600 is configured to move vertically because the first end 502 of the body assembly of the nozzle assembly is configured to collapse. That is, the first end 520 of the body assembly of the nozzle assembly has a first position in which the first end 502 of the body assembly of the nozzle assembly extends, and the first end 502 of the body assembly of the nozzle assembly contracts. And move between the second positions. If desired, in use, the second end 506 of the body assembly of the nozzle assembly extends generally in the horizontal direction from the rail 56, and the body assembly middle 504 of the nozzle assembly is curved downward. In this configuration, the nozzle 600 is lower when the first end 502 of the body assembly of the nozzle assembly is in the first position than when the first end 502 of the body assembly of the nozzle assembly is in the second position. Is placed at a height.

The first end 502 of the body assembly of the nozzle assembly is configured to fold through a bellows device, but in a preferred embodiment, movement of the nozzle 600 is achieved by the retraction assembly 520 (FIG. 18). do. That is, the body assembly 500 of the nozzle assembly includes a body member 510 and a shrinkage assembly 520. The body member 510 of the assembly of the body of the nozzle assembly is a substantially rigid member having an elongated first end 512, an intermediate portion 514, and an elongated second end 516. The body member intermediate portion 514 of the body assembly of the nozzle assembly is arcuate and preferably extends over an arc of about 90 degrees, and thus, the first end 512 of the body member of the body assembly of the nozzle assembly and the nozzle assembly. The second ends 516 of the body members of the body assembly are disposed at approximately right angles to each other. The retraction assembly 520 includes a cable 522 and a sliding head assembly 524. As shown in FIGS. 18 and 19, the sliding head assembly 524 is movably connected to the first end 512 of the body member of the body assembly of the nozzle assembly and is longitudinally relative to the first end 512. It is configured to go to. The cable 522 of the retraction assembly is movably disposed on the body member 510 of the body assembly of the nozzle assembly and is connected to the sliding head assembly 524. In such a structure, movement of the cable 522 of the shrinkage assembly moves the sliding head assembly 524. The nozzle 600 is disposed on the sliding head assembly 5240. Thus, the movement of the sliding head assembly 524 relative to the first end 512 of the body member of the body assembly of the nozzle assembly generally occurs along a vertical axis.

The body member 510 of the body assembly of the nozzle assembly forms a plurality of passages. For example, in this embodiment, the water passage 401 of the nozzle assembly is divided into a first elongated high pressure channel 530 and a second elongated high pressure water channel 532. The first and second high pressure channels 530, 532 are disposed on substantially the same plane and extend substantially parallel to each other. One or both of the high pressure channels 530, 532 may include a passage in fluid communication with the body 544 of the sliding head assembly. In this configuration, the water pressure acts to bias the body 544 of the sliding head assembly to the first position as described below. Furthermore, at the first end 512 of the body member of the body assembly of the nozzle assembly, there are two bores 536, which are preferably configured, to support a pair of gear shafts 540, 542.

That is, at the first end 512 of the body member of the body assembly of the nozzle assembly a pair of outwardly extending generally parallel to the longitudinal axis of the first end 512 of the body member of the body assembly of the nozzle assembly There are guide shafts, ie first and second guide shafts 540, 542. The first and second guide shafts 540, 542 interact with the sliding head assembly 524. Sliding head assembly 524 further includes a body 544. The body 544 of the sliding head assembly is movably connected to the first and second elongated guide shafts 540, 542 of the sliding head assembly, and the body 544 of the sliding head assembly is the body member of the body assembly of the nozzle assembly. Between the first extended position spaced from the first end 512 of the second position where the body 544 of the sliding head assembly is disposed proximate to the first end 512 of the body member of the body assembly of the nozzle assembly. Configured to move. If desired, the body 544 of the sliding head assembly defines two passages 546 having sizes corresponding to the first and second guide shafts 540, 542. Thus, the body 544 of the sliding head assembly may be slidably connected to the first and second guide shafts 540, 542. Moreover, the cable 522 of the reaction assembly is connected to the body 544 of the sliding head assembly. Thus, the operation of the cable 522 is the sliding head assembly across the first and second guide shafts 540, 542 and relative to the first end 512 of the body member of the body assembly of the nozzle assembly. The main body 544 is moved.

The body 544 of the sliding head assembly further defines two water passages 546. The water passage 546 of the body of the sliding head assembly generally terminates at the lateral nozzle 600, as shown in FIG. 18A. The nozzle 600 may open in the same direction, but may open in opposite directions or in both transverse directions. Sliding head assembly 524 further includes a first elongated high pressure tube 550 and a second elongated high pressure water tube 552. First and second high pressure tubes 550, 552 are connected to the body 544 of the sliding head assembly. The first and second high pressure channels 530, 532 are sized to receive the first and second high pressure tubes 550, 552. Moreover, each of the first and second high pressure tubes 550, 552 is connected and in fluid communication with one of the high pressure channels 530, 532 and one of the water passages 546 of the body of the sliding head assembly. There is a seal 554 around the first and second high pressure tubes 550, 552, and the seal 554 comprises the first and second high pressure tubes 550, 552 and the first and second high pressure channels 530. 532). In such a structure, as the body 544 of the sliding head assembly moves between the first and second positions, the first and second high pressure tubes 550, 552 are moved to the first and second high pressure channels 530, 532. Move in and out. Finally, the body 544 of the sliding head assembly is protected by a shell 556 disposed around the body 544 of the sliding head assembly and connected to the second end 516 of the body member of the body assembly of the nozzle assembly. Can be. The shell 556 of the body of the sliding head assembly has a slot 558 (FIG. 17), the slot 558 extending over the traveling path of the nozzle 600 and aligned with the traveling path of the nozzle 600.

Nozzle assembly 58B does not rotate as in the embodiment with nozzle assembly 58A, and the motion of drive shaft 72 should be longitudinal motion. That is, in the present embodiment, the drive shaft 72 has a first position where the drive shaft 72 extends from the first end 74 of the rail body, and the drive shaft 72 has a second end ( Configured to move longitudinally within rail 56 between second positions that move toward 76. Moreover, the first end 82 of the drive shaft is a threaded connection or another type of temporary flexible connection. Cable 522 has a first end 526 and a second end 528. The second end 528 of the cable is configured to be temporarily fixed to the first end 82 of the drive shaft. The first end 82 of the drive shaft is temporarily connected to the second end 528 of the cable. Thus, upon longitudinal movement of drive shaft 72, cable 522 can move longitudinally within body member 510 of the body assembly of the nozzle assembly.

The longitudinal motion of the drive shaft 72 is generated by the oscillator assembly 330. Many of the oscillator assemblies 330 are the same as described above, and like reference numerals will be described below. That is, the motor assembly 334 and the gear assembly 338 are substantially the same as described above. A notable difference between the previous and present embodiments is in connection with the drive shaft 72. In the previous embodiment, the drive shaft 72 is required for rotation to rotate the nozzle assembly 58A. In this embodiment, the drive shaft 72 must move in the longitudinal direction. This is achieved by having a thread 576 on the second end 84 of the drive shaft, and as described above between the second end 84 of the drive shaft and the gear assembly 338 of the oscillator assembly. This is accomplished by placing 570.

That is, in this embodiment, the second end 84 of the drive shaft includes a screw collar 570. Screw collar 570 has a keyed outer radial surface 572 and, if desired, has a threaded inner surface 574 of square shape. The outer radial surface 572 of the threaded collar has a shape corresponding to the keyed opening 344 of the second gear. The second end 84 of the drive shaft also has a thread 576. The threaded portion 576 of the second end of the drive shaft extends beyond the second end 76 of the rail body to be exposed. The screw collar 570 is disposed in the keyed opening 344 of the second gear. In this structure, the operation of the motor assembly 334 of the oscillator assembly rotates the screw collar 570. Thus, as the threaded portion 576 of the second end of the drive shaft is disposed and engaged in the screw inner surface 574 of the screwed collar, rotation of the screw collar 570 causes the threaded portion 576 of the second end of the drive shaft to be engaged. Translate along the screw collar 570. This creates the longitudinal motion of the drive shaft 72.

In order to actuate this structure and prevent the drive shaft segments 94 from releasing from each other, the drive shaft 72 should not rotate. Moreover, there is still a need to know the structure and / or location of the body 500 of the nozzle assembly in case of power loss. That is, as described above, the motor assembly 334 of the oscillator assembly includes the motor control assembly 450 of the electronic oscillator assembly configured to track the position of the nozzle assembly 58. Since the motor control assembly 450 of the oscillator assembly is electrical, power loss can cause the motor control assembly 450 of the oscillator assembly to lose data regarding the position of the nozzle assembly 58B. In this embodiment, both of these functions are achieved by the oscillator assembly nozzle position reset device 580.

The nozzle position reset device 580 includes a drive shaft extension 582, a movable mark 584, a fixed mark 586, and a keyed opening 588. Drive shaft extension 582 extends longitudinally from second end 84 of the drive shaft. The drive shaft extension 582 is key shaped and may be an elongated portion of the second end 82 of the drive shaft extending beyond the threaded portion 576 of the second end of the drive shaft. A movable mark 584 is disposed on the second end 84 of the drive shaft, and more preferably on the drive shaft extension 582. The stationary mark 586 is disposed adjacent the drive shaft extension 582 and may simply be the outer surface of the housing assembly 332 of the oscillator assembly. If desired, when the body 544 of the sliding head assembly is in the first position, the two nozzle position reset device indications 584, 586 are aligned. As the drive shaft 72 moves longitudinally toward the second end 76 of the rail body, moving the cable 522 and the body 544 of the sliding head assembly, two nozzle position reset devices are shown ( 584 and 586 are spaced apart from each other. In order to reset the position of the body 544 of the sliding head assembly, the two nozzle position reset device indications 584, 586 must be rearranged. That is, the motor assembly 334 of the oscillator assembly operates in the direction necessary to return the two nozzle position reset device indications 584, 586 to their alignment. Thus, when the position of the movable mark 584 is compared to the fixed mark 586, the position of the drive shaft 72 relative to the rail body 70 is displayed. In a preferred embodiment, the housing assembly 332 of the oscillator assembly includes an offset end plate 590 spaced axially from the screw collar 570. Offset end plate 590 has a keyed opening 588 therethrough. The opening 588 of the offset end plate is sized to penetrate the drive shaft extension 582. The stationary mark 584 is disposed on the offset end plate 590. In addition, the keyed drive shaft extension 582 through the keyed opening 588 prevents rotation of the drive shaft 72. Thus, as the screw collar 570 rotates, the orientation of the drive shaft 72 is maintained and the interaction with the screw collar 570 causes the drive shaft 72 to translate in the longitudinal direction.

In both nozzle assembly embodiments 58A, 58B, the water flow is from the direction of water travel in the body 400, 500 of the nozzle assembly, in the transverse direction that the nozzle 600 faces, as shown in FIG. It should rotate about 90 degrees. This change in direction creates turbulence, particularly when located close to the nozzle 600, resulting in an irregular spray pattern from the nozzle 600. At least one flow straightener 602 is disposed in the at least one nozzle 600 to return the water flow to normal laminar flow. As shown in FIG. 22, the flow straightener 602 includes a body 604 having a plurality of passages 606. The passages 606 of the flow straighteners extend substantially parallel to each other. The body 604 of the at least one flow straightener is preferably a generally circular disk, with passages 606 of the flow straightener extending axially. If desired, the flow straightener 602 is disposed in at least one of the transverse nozzles 600, as opposed to the upstream position of the bodies 400, 500 of the nozzle assembly. If desired, the diameter of the body 604 of each flow straightener is between about 0.1 and 0.2 inches, more preferably about 0.15 inches. It is preferred that there are between about 10 and 30 flow straightener passages 606, and more preferably there are about 19 flow straightener passages 606. The diameter of the passage 606 of the flow straightener is between about 0.01 and 0.03 inches, more preferably about 0.02 inches.

The mounting assembly 52 is configured to be adjustable to connect to the steam generator 10 and to allow the sludge lance 50, and more specifically the rail 56, to be aligned with the tube gap 25. If desired, as shown in FIGS. 23-25, the mounting assembly 52 may include a vertical first plate 701, a horizontal second plate 702, and a floating third plate 704. "L" -shaped mounting bracket 700 and fastener assembly 706. The first plate 701 is configured to be connected to the inspection opening 32. That is, the inspection opening 32 includes a fastener hole used to secure a cover (not shown) to the inspection opening 32. The fastener assembly 706 includes an opening (not shown) of the first plate 701 and a fastener 708 configured to penetrate into the inspection opening 32 fastener hole. The second plate 702 is fixed to the first plate 701 at approximately right angles. That is, the second plate 702 generally extends in the horizontal direction. The third plate 704 is movably connected to the second plate 702. The fastener assembly 706 is configured to temporarily secure the third plate 704 to the second plate 702.

That is, the third plate 704 is configured to be adjustable relative to the inspection opening 32 and the second plate 702. For example, the second plate 702 includes two transversely extending slots 710 (FIG. 25). The third plate 704 includes a first screw opening 712 and a second screw opening 714 (FIG. 24). The first screw opening 712 and the second screw opening 714 are aligned with one of the second plate lateral extension slots 710 when the third plate 704 is disposed over the second plate 702. It is composed. Fastener assembly 706 includes two screw knobs 720. Each screw knob 720 is configured to extend upwardly through one of the second plate lateral extension slots 710 and to be threaded into one of the third plate screw openings 712, 714. do. In this configuration, the third plate 704 can move transversely with respect to the second plate 702, and when the proper position is reached, the screw knob 720 is tightened to secure the second plate 702. 3 Plate 704 is temporarily fixed.

Moreover, the angle of the longitudinal axis of the rail relative to the inspection opening 32 can be adjusted. That is, the third plate 704 includes a drive assembly connection 730. Drive assembly connection 730 is configured to rotate drive assembly 54 relative to third plate 704. That is, the second plate 702 includes an arcuate slot 732 disposed on the longitudinal axis of the second plate 702. The third plate 704 has an upwardly extending lug 734 disposed on the longitudinal axis of the second plate 702. The third plate 704 also has an arcuate slot 735 disposed on the longitudinal axis of the third plate 704. Fastener assembly 706 includes third screw knob 720. The drive assembly 54 has two mounting openings, namely a first mounting opening 736 (FIG. 14) corresponding to the mounting assembly lug 734, and a second mounting opening having a thread corresponding to the screw knob 720. 738 (FIG. 14). The second mounting opening 738 is configured to align with the second plate arcuate slot 732 when the third plate 704 is disposed on the second plate 702. When assembled, the drive assembly 54 is disposed on the third plate 704, the mounting assembly lug 734 is disposed on the first mounting opening 736, and the screw knob 720 is provided with a thread. 2 are disposed (ie, engaged) in the mounting opening 738. In this structure, the drive assembly 54 can rotate around the mounting assembly lug 734 until the desired angle is reached. When the drive assembly 54 is aligned, the screw knob 720 penetrates into the second mounting opening 738 through the second plate arcuate slot 732 and the third plate arcuate slot 735. In order to temporarily secure the drive assembly 54 to the third plate 704, the screw knob 720 is tightened.

Each of the second plate 702 and the third plate 704 may have a set of marks 740, 742. Mounting assembly indications 740 and 742 are preferably scale or similar markings. The position of the mounting assembly indications 740, 742 relative to each other can be recorded when the sludge lance 50 is successfully used (meaning the rail 56 is properly aligned with the tube gap 25). Thereafter, the second plate 702 and the third plate 704 may be pre-positioned relative to each other according to the recorded position after the sludge lance 50 is used in the corresponding inspection opening 32.

While specific embodiments of the invention have been described in detail, those skilled in the art will appreciate that various modifications and alternatives to these details can be made in light of the overall teachings of the disclosure. Accordingly, the specific embodiments disclosed are only illustrative and are not intended to limit the scope of the invention, which is to be given the full scope of the appended claims and all equivalents thereof.

Claims (62)

A miniature sludge lance for use in a steam generator, the steam generator comprising a shell defining a confined space, at least one first fluid inlet, at least one first fluid outlet, and at least one first A second fluid inlet, at least one second fluid outlet, and a plurality of substantially uniformly sized tubes extending between and in fluid communication with the at least one first fluid inlet and the at least one first fluid outlet. Wherein the tubes are arranged in a substantially regular pattern with substantially uniform, narrow gaps between adjacent tubes, and wherein the shell has at least one inspection opening disposed adjacent the plurality of tubes. In the sludge lance,
A mounting assembly configured to support the drive assembly and the rail;
A drive assembly coupled to the mounting assembly and configured to move a rail through the inspection opening;
An elongated rail having a body and a drive shaft, wherein the rail body has a first end and a second end, the rail body is sized to pass between adjacent tubes, and the rail body has a water passage and a drive shaft passage. And the drive shaft is rotatably disposed within the drive shaft passage, the rail body is movably connected to the drive assembly, and the rail water passage is configured to be in fluid communication with the water source. With long rails,
A nozzle assembly having a body assembly, wherein the body assembly of the nozzle assembly is sized to pass between adjacent tubes, the body assembly of the nozzle assembly forms a water passage, and the body assembly of the nozzle assembly is connected to the rail body. And the water passage of the body assembly of the nozzle assembly includes the nozzle assembly in fluid communication with the water passage of the rail body,
As the rail body moves through the inspection opening, the nozzle assembly passes between adjacent tubes.
Compact sludge lance. The method of claim 1,
The body assembly of the nozzle assembly is elongated and includes at least two transverse nozzles.
Compact sludge lance. The method of claim 2,
The at least two transverse nozzles are longitudinally spaced apart from each other on the body assembly of the nozzle assembly, and the nozzles are spaced at substantially the same distance between centerlines of two adjacent tubes.
Compact sludge lance. The method of claim 3, wherein
The at least two lateral nozzles comprise four nozzles, the nozzles being arranged in opposing pairs, the pair of nozzles facing substantially opposite directions.
Compact sludge lance. The method of claim 1,
The rail comprises a plurality of rail assemblies and a water manifold,
Each said rail assembly has a drive shaft segment and an elongated body,
The body of each said rail assembly has a first end and a second end, and forms a water passage and a drive shaft passage, the body of each said rail assembly is sized to pass between adjacent tubes,
Each said drive shaft segment having a first end and a second end, each said drive shaft end being configured to be a coupling;
The water manifold is configured to be in fluid communication with a water source, and has a drive shaft segment and a body, the body of the water manifold has a first end and a second end, and forms a water passage and a drive shaft passage; ,
A first end of the body of the water manifold is connected to a second end of the body of the rail assembly disposed at the second end of the rail body,
The drive shaft segment of the water manifold and the drive shaft segment of each rail assembly are temporarily fixed to each other to form the drive shaft.
Compact sludge lance. The method of claim 5, wherein
Each of the drive shaft segments includes at least one bearing disposed between the drive shaft segment and a drive shaft passageway of the body of the rail assembly.
Compact sludge lance. The method according to claim 6,
Each said drive shaft segment comprising at least one reducing diameter,
Each said at least one bearing is disposed at a reduced diameter of said drive shaft segment,
The bearing is secured to the body of the rail assembly such that each drive shaft segment is trapped within the body of the associated rail assembly.
Compact sludge lance. The method of claim 7, wherein
Each said at least one bearing has a predetermined length,
The reduced diameter portion of each said drive shaft segment has an axial length that is greater than the length of said at least one bearing.
Compact sludge lance. The method of claim 8,
Each said rail assembly comprises a connection assembly having a first connection component disposed at a first end of a body of said rail assembly and a second connection component disposed at a second end of a body of said rail assembly; ,
The connecting assembly is configured to connect the rail assemblies in series
Compact sludge lance. The method of claim 9,
A first connecting component of the connecting assembly of each said rail assembly comprises at least one screw fastener disposed at a first end of a body of said rail assembly,
The second connecting component of the connecting assembly of each of the rail assemblies includes at least one threaded bore disposed at the second end of the body of the rail assembly.
Compact sludge lance. 11. The method of claim 10,
Each said rail assembly comprises a water passage seal,
A water passage seal of each said rail assembly is disposed at a first end of a body of an associated rail assembly, and each said water passage seal is configured to be sealingly coupled with a body of an adjacent rail assembly.
Compact sludge lance. The method of claim 5, wherein
The body of each said rail assembly has a substantially uniform length
Compact sludge lance. The method of claim 5, wherein
The rail includes a head assembly, the head assembly configured to movably support the nozzle assembly, the head assembly having a first end and a second end and the body of the head assembly having a water passage and a drive shaft passage. A main body having a shape, the main body of the head assembly having a size passing through adjacent tubes,
A second end of the body of the head assembly is connected to a first end of the body of the rail assembly disposed at the first end of the rail,
The body of the head assembly, the body of the at least one rail assembly, and the body of the water manifold form the rail water passage and the drive shaft passage.
Compact sludge lance. The method of claim 1,
The rail body has a transverse side, at least one transverse side of the rail body has a plurality of sprocket holes,
The drive assembly has a motor, a housing assembly, a drive sprocket, and at least one guide surface,
The motor has an output shaft, the motor is configured to rotate the output shaft, the output shaft is connected to the drive sprocket,
The at least one guide surface is configured to maintain the rail body in contact with the sprocket,
The rail body is disposed between the guide surface and the sprocket, the sprocket hole engaging with the sprocket teeth
Compact sludge lance. 15. The method of claim 14,
The housing assembly of the drive assembly includes an upper case and a lower case,
The upper case and the lower case are movably connected to each other and configured to translate relative to each other, wherein the upper case and the lower case are configured to move on the axis in substantially the same plane.
Compact sludge lance. The method of claim 15,
The housing assembly of the drive assembly includes two elongated guide pin passages and two elongated guide pins,
The guide pin passage extends through both the upper case and the lower case,
The longitudinal axes of the guide pin passages are arranged in the same plane and extend substantially parallel to each other,
The guide pin is disposed in the guide pin passage is connected to the lower case
Compact sludge lance. 17. The method of claim 16,
One said guide pin comprises a bias assembly with a biasing device, a knob, and a threaded end on an associated guide pin,
One said guide pin passageway has a wide diameter portion, so that an annular space is created when the guide pin is disposed in the passage having a wide diameter portion,
The bias device is disposed in the annular space,
The screw end of the guide pin is disposed adjacent to the upper case,
The knob has a screw opening, the knob is disposed on a threaded end of the guide pin,
The biasing device is disposed between the knob and a lower portion of the annular space,
The bias assembly biases the upper case and the lower case toward each other.
Compact sludge lance. The method of claim 15,
The drive sprocket is rotatably connected to the lower case,
The at least one guide surface is disposed on the upper case,
The drive sprocket and the at least one guide surface engage with opposite lateral sides of the rail.
Compact sludge lance. The method of claim 15,
The at least one guide surface is at least one guide wheel rotatably attached to the upper case.
Compact sludge lance. The method of claim 19,
The at least one guide wheel is three guide wheels,
The guide wheel and the sprocket have substantially the same diameter,
The axes of the three guide wheels and the sprocket are arranged in a substantially rectangular pattern
Compact sludge lance. The method of claim 19,
The drive assembly further includes a gear assembly, the gear assembly configured to be connected to the sprocket to rotate the at least one guide wheel.
Compact sludge lance. 22. The method of claim 21,
The gear assembly of the drive assembly comprises a first gear, a second gear, a third gear, a fourth gear, a first elongated link, and a second elongated link,
The first gear is fixed to the sprocket,
The second gear is fixed to the at least one guide wheel,
The first link has a first end and a second end, the first link is sized to rotatably support the first gear, the third gear, and the fourth gear in an operatively engaged state;
The second link has a first end and a second end, the second link is sized to support the second gear and the fourth gear in an operatively engaged state;
A first end of the first link is rotatably connected to the lower case, and a rotation axis corresponds to the sprocket rotation axis;
A first end of the second link is rotatably connected to the upper case, a rotation axis corresponding to the at least one guide wheel rotation axis,
The second end of the first link and the second end of the second link are rotatably connected together.
Compact sludge lance. The method of claim 1,
The tubes in the plurality of tubes have a centerline, the centerlines of the tubes being spaced substantially uniformly so as to have a substantially uniform centerline distance between adjacent tubes,
The rail includes a positioning assembly, the positioning assembly includes a body, a stop, an adjustable pointer assembly, and a plurality of indicia,
The stop is connected to the first end of the rail and is sized so as not to pass between adjacent tubes,
The adjustable pointer assembly is movably connected to the drive assembly adjacent the rail and configured to move in a direction substantially parallel to the longitudinal axis of the rail,
The plurality of marks are disposed on the rail, the marks being spaced apart by a multiple of the centerline distance of the tube.
Compact sludge lance. 24. The method of claim 23,
The rail comprises a plurality of rail assemblies,
The at least one mark includes a plurality of marks disposed on each rail assembly.
Compact sludge lance. 24. The method of claim 23,
The drive assembly includes at least one fastener opening adjacent the rail,
The adjustable pointer assembly comprises at least one fastener and an elongated body,
The body of the adjustable pointer assembly has a longitudinal slot therein,
At least one fastener of the adjustable pointer assembly is disposed through one slot of the body of the adjustable pointer assembly and is connected to at least one fastener opening of the drive assembly.
Compact sludge lance. The method of claim 1,
The rail includes an oscillator assembly configured to produce periodic motion,
The oscillator assembly is operably connected to the drive shaft such that the drive shaft moves periodically.
Compact sludge lance. The method of claim 26,
The oscillator assembly comprises a housing assembly, a motor having an elongated output shaft, and a gear assembly,
A motor of the oscillator assembly is connected to a housing assembly of the oscillator assembly,
The gear assembly of the oscillator assembly has a first gear and a second gear, the first gear and the second gear are operably connected,
The first gear is fixed to an output shaft of a motor of the oscillator assembly,
The second gear has a keyed opening,
A second end of the drive shaft extends from the rail, the second end of the drive shaft is key shaped,
The keyed second end of the drive shaft is disposed in the keyed opening of the second gear,
The drive shaft is movable in the axial direction through the second gear
Compact sludge lance. The method of claim 27,
The gear assembly of the oscillator assembly is a meter gear assembly.
Compact sludge lance. The method of claim 27,
The body of the nozzle assembly is elongated and includes at least two lateral nozzles, the nozzle in fluid communication with a water passage in the nozzle body,
The at least two transverse nozzles are configured to move relative to the rail
Compact sludge lance. 30. The method of claim 29,
The body of the nozzle assembly is connected to the drive shaft,
By the movement of the drive shaft, the nozzle body is moved relative to the rail
Compact sludge lance. 31. The method of claim 30,
The rail body includes a first end fluid passage between the water passage and the drive shaft passage, the first end fluid passage being disposed at a first end of the rail body,
The body of the nozzle assembly is an elongate, substantially hollow, substantially linear tube, the tube having a first end, a middle part and a second end,
The body of the nozzle assembly is configured to be rotatably connected to the rail, the second end of the body of the nozzle assembly and the intermediate portion of the body of the nozzle assembly are disposed within the rail body, and the first end of the body of the nozzle assembly. Extends from the first end of the rail,
At least one fluid port is located in the middle of the body of the nozzle assembly, at least one fluid port of the nozzle assembly is located in a first end fluid passage of the rail body, and the fluid port is a water passage of the nozzle body. In fluid communication with the at least one fluid port for communicating fluid between the water passage of the rail body and the water passage of the nozzle body,
The nozzle body is configured to rotate about a longitudinal axis of the nozzle body
Compact sludge lance. The method of claim 31, wherein
The second end of the body of the nozzle assembly forms a keyed socket,
The first end of the drive shaft is a key corresponding to the keyed socket of the second end of the body of the nozzle assembly,
When the body of the nozzle assembly is partially disposed within the rail body, the keyed first end of the drive shaft is temporarily fixed to the keyed socket of the second end of the body of the nozzle assembly such that rotation of the drive shaft is prevented. To rotate the nozzle body
Compact sludge lance. 33. The method of claim 32,
The housing assembly of the oscillator assembly comprises a keyed socket insertion assembly,
The keyed socket insertion assembly is configured to engage the drive shaft and bias the drive shaft toward the first end of the rail body.
Compact sludge lance. 34. The method of claim 33,
The keyed socket insertion assembly comprises a generally tubular keyed body, a plunger, a biasing device, and a cap,
The outer radial surface of the body of the keyed socket insert assembly has a shape corresponding to the keyed opening of the second gear, the body of the keyed socket insert assembly further has an elongated keyed passage, and of the body of the keyed socket insert assembly The keyed opening is configured to correspond to the keyed second end of the drive shaft,
The plunger of the keyed socket insertion assembly is disposed in an elongated passage of the body of the keyed socket insertion assembly,
The cap of the keyed socket insertion assembly is connected to the body of the keyed socket insertion assembly at the rear end of the elongated passage of the body of the keyed socket insertion assembly,
The biasing device of the keyed socket insert assembly is disposed between the plunger of the keyed socket insert assembly and the cap of the keyed socket insert assembly to bias the plunger of the keyed socket insert assembly toward the first end of the rail body. Become,
A plunger of the keyed socket insertion assembly engages with the drive shaft to bias the drive shaft toward the first end of the rail body.
Compact sludge lance. 35. The method of claim 34,
The biasing device of the keyed socket insert assembly is a spring
Compact sludge lance. 36. The method of claim 35,
The rail comprises a plurality of rail assemblies,
Each said rail assembly has a drive shaft segment and an elongated body,
The body of each said rail assembly has a first end and a second end, and forms a water passage and a drive shaft passage, the body of each said rail assembly is sized to pass between adjacent tubes,
Each said drive shaft segment having a first end and a second end, each said drive shaft end being configured to be a keyed connection,
Each said keyed connection comprises a tapered extension and a corresponding tapered socket
Compact sludge lance. The method of claim 36,
Each tapered extension is tapered sharply by about 0.0 to 4.0 degrees than the respective tapered socket.
Compact sludge lance. 39. The method of claim 37,
Each tapered extension tapered about 2.0 degrees sharper than each said tapered socket.
Compact sludge lance. 35. The method of claim 34,
The oscillator assembly includes a nozzle orientation reset device configured to position the body of the nozzle assembly such that the nozzle is disposed in a selected orientation.
Compact sludge lance. 40. The method of claim 39,
The motor of the oscillator assembly comprises a control assembly and a sensor assembly, the sensor assembly comprising an encoder and a mechanical resistance sensor,
The control assembly is configured to operate a motor of the oscillator assembly in response to an input, and to receive input from the encoder and the resistance sensor,
The encoder is configured to track the position of the gear within the gear assembly of the oscillator assembly and to provide position data to a motor control assembly of the oscillator assembly.
Compact sludge lance. 41. The method of claim 40,
The nozzle orientation reset device comprises an end plate and a lug,
The end plate is disposed adjacent the body of the keyed socket insertion assembly, the end plate is disposed in a plane generally perpendicular to the axis of rotation of the drive shaft, the end plate having an arcuate channel on the end plate,
The arcuate channel of the end plate has a center substantially aligned with the axis of rotation of the drive shaft,
The body of the keyed socket insertion assembly has lugs extending in the axial direction, the lugs having a size movably disposed in the arcuate channel,
The lug is disposed within the arcuate channel,
As the motor assembly of the oscillator assembly operates the lug reciprocates in the channel,
When the motor of the oscillator assembly is reset, the lug reciprocates in the channel until it contacts each end of the channel, and when the contact is made, the resistance sensor is connected to the motor control assembly of the oscillator assembly. Provide position input data, wherein the motor control assembly of the oscillator assembly uses the encoder position data to reposition the nozzle to a selected orientation.
Compact sludge lance. 33. The method of claim 32,
An intermediate portion of the body of the nozzle assembly includes a solid portion disposed between the water passage of the nozzle body and the keyed socket of the second end of the nozzle body,
The body of the nozzle assembly includes a seal assembly having a plurality of seals, wherein the plurality of seals are arranged around the body of the nozzle assembly to substantially prevent water from escaping around the body of the nozzle assembly,
The seal assembly comprises at least a first seal and a second seal,
The first seal is disposed immediately adjacent the first end of the rail body and is configured to prevent water from passing through the first end of the rail body,
The second seal is arranged around the solid portion of the body of the nozzle assembly to prevent water from passing through the drive shaft passageway.
Compact sludge lance. 43. The method of claim 42,
The water passage at the first end of the rail body has an elliptical cross-sectional shape
Compact sludge lance. 44. The method of claim 43,
The at least two transverse nozzles are longitudinally spaced apart from each other on the body of the nozzle assembly, and the nozzles are spaced at substantially the same distance between centerlines of two adjacent tubes.
Compact sludge lance. 44. The method of claim 43,
The at least two transverse nozzles comprise six nozzles, the nozzles being arranged in three pairs, the pair of nozzles facing substantially opposite directions
Compact sludge lance. 31. The method of claim 30,
The nozzle assembly comprises an elongated body assembly having an elongated first end, an intermediate portion and an elongated second end,
The intermediate portion of the body assembly of the nozzle assembly is arcuate such that the first end of the body assembly of the nozzle assembly and the second end of the body assembly of the nozzle assembly are disposed approximately perpendicular to each other,
The nozzle is disposed at a first end of the body assembly of the nozzle assembly,
The first end of the body assembly of the nozzle assembly is configured to be folded
Compact sludge lance. 47. The method of claim 46,
The body assembly of the nozzle assembly includes a body member and a retract assembly,
The body member of the body assembly of the nozzle assembly is substantially rigid and has an elongated first end, an intermediate portion, and an elongated second end,
The body member intermediate portion of the body assembly of the nozzle assembly is arcuate such that the first end of the body member of the body assembly of the nozzle assembly and the second end of the body member of the body assembly of the nozzle assembly are disposed at approximately right angles to each other; ,
The retract assembly includes a cable and a sliding head assembly,
The sliding head assembly is movably connected to the first end of the body member of the body assembly of the nozzle assembly and is configured to move longitudinally relative to the first end of the body member of the body assembly of the nozzle assembly,
The cable of the shrinkage assembly is movably disposed within the body member of the body assembly of the nozzle assembly and is connected to the sliding head assembly such that movement of the cable of the shrinkage assembly moves the sliding head assembly,
The nozzle is disposed on the sliding head assembly
Compact sludge lance. 49. The method of claim 47,
Within the body member of the body assembly of the nozzle assembly, the water passage of the nozzle assembly is divided into a first elongated high pressure channel and a second elongated high pressure water channel, wherein the first and second high pressure channels are disposed in substantially the same plane Extend substantially parallel to each other,
The sliding head assembly comprises a body and at least first and second elongated guide shafts,
The first and second elongated guide shafts of the sliding head assembly are connected to and extend from the first end of the body member of the body assembly of the nozzle assembly, and the first and second elongated guide shafts are disposed on the same plane and Extending substantially parallel to each other, the first and second elongated guide shafts also extend substantially parallel to the longitudinal axis of the first end of the body member of the body assembly of the nozzle assembly,
The body of the sliding head assembly is movably connected to the first and second elongated guide shafts of the sliding head assembly, wherein the body of the sliding head assembly is spaced apart from the first end of the body member of the body assembly of the nozzle assembly. The extended first position and the second position at which the body of the sliding head assembly is disposed proximate to the first end of the body member of the body assembly of the nozzle assembly,
Operation of the cable moves the body of the sliding head assembly.
Compact sludge lance. 49. The method of claim 48,
The sliding head assembly comprises a first elongated high pressure tube and a second elongated high pressure water tube, the first and second high pressure tubes being connected to a body of the sliding head assembly,
The first and second high pressure channels are sized to receive the first and second high pressure tubes,
Each of the first and second high pressure tubes is in fluid communication with one of the high pressure channels and one nozzle;
As the body of the sliding head assembly moves between the first position and the second position, the first and second high pressure tubes move into and out of the first and second high pressure channels.
Compact sludge lance. The method of claim 49,
The drive shaft is longitudinally within the rail between a first position in which the drive shaft extends from a first end of the rail body and a second position in which the drive shaft moves toward a second end of the rail body. Configured to go to
Compact sludge lance. 51. The method of claim 50,
A second end of the body of the nozzle assembly forms a fixed connection,
The cable has a first end and a second end, the second end of the cable being a fixed connection,
The first end of the drive shaft is a fixed connection configured to correspond to a fixed connection of a second end of a cable of the nozzle assembly.
Compact sludge lance. 52. The method of claim 51,
The housing assembly of the oscillator assembly comprises a threaded collar, the screw collar having a keyed outer radial surface and a screw inner surface,
The outer radial surface of the screw collar has a shape corresponding to the keyed opening of the second gear,
The second end of the drive shaft has a threaded portion, the threaded portion of the second end of the drive shaft extends beyond the second end of the rail body,
The screw collar is disposed in the keyed opening of the second gear such that operation of the motor of the oscillator assembly rotates the screw collar,
The threaded portion of the second end of the drive shaft is disposed within the threaded inner surface of the screw collar and engages with the threaded inner surface of the screw collar such that rotation of the screw collar causes the threaded portion of the second end of the drive shaft to engage the screwed collar. Translating through
Compact sludge lance. 53. The method of claim 52,
The oscillator assembly includes a nozzle position reset device configured to identify a position of the sliding head assembly.
Compact sludge lance. 54. The method of claim 53,
The nozzle position reset device includes a drive shaft extension, a movable mark, and a fixed mark,
The drive shaft extension extends longitudinally from the second end of the drive shaft,
The movable mark is disposed on the drive shaft extension,
The fixed mark is disposed adjacent the drive shaft extension,
Comparing the position of the movable mark relative to the stationary mark to indicate the position of the drive shaft relative to the rail body;
Compact sludge lance. 54. The method of claim 53,
The housing assembly of the oscillator assembly comprises an offset end plate axially spaced from the screw collar,
The offset end plate has an opening therethrough, the opening of the offset end plate has a size through which the drive shaft extension can pass,
The fixed mark is disposed on the offset end plate
Compact sludge lance. The method of claim 1,
The nozzle assembly includes at least one flow straightener.
Compact sludge lance. 57. The method of claim 56,
The at least one flow straightener includes a body having a plurality of passages therethrough, the passages extending substantially parallel to each other.
Compact sludge lance. 58. The method of claim 57,
The body of the at least one flow straightener is a generally circular disk and the passage of the flow straightener extends in the axial direction.
Compact sludge lance. 58. The method of claim 57,
The at least one flow straightener is disposed in at least one of the lateral nozzles.
Compact sludge lance. The method of claim 1,
The mounting assembly comprises a vertical first plate, a horizontal second plate, a floating third plate, and a fastener assembly,
The first plate is configured to be connected to the inspection opening,
The second plate is fixed to the first plate at approximately a right angle,
The third plate is movably connected to the second plate,
The fastener assembly is configured to temporarily secure the third plate to the second plate
Compact sludge lance. 64. The method of claim 60,
The second plate comprises two transversely extending slots,
The third plate comprises a first screw opening and a second screw opening, the first screw opening and the second screw opening being configured to align with one transversely extending slot of the second plate,
The fastener assembly includes two threaded knobs, each threaded knob extending upward through one transversely extending slot of the second plate, and a first screw opening of the third plate. And screwed into one of the second screw openings,
When the screw knob is tightened, the third plate is temporarily fixed to the second plate.
Compact sludge lance. 62. The method of claim 61,
The second plate comprises an arcuate slot disposed on a longitudinal axis of the second plate,
The third plate has an upwardly extending lug disposed on the longitudinal axis of the second plate,
The third plate comprises an arcuate slot disposed on a longitudinal axis of the third plate,
The fastener assembly comprises a third screw knob,
The drive assembly has two mounting openings, the two openings comprising a first mounting opening corresponding to the lug and a second mounting opening with a screw corresponding to the third knob,
The drive assembly is disposed on the third plate, the lug is disposed within the first mounting opening, and the third knob is disposed within the threaded second mounting opening.
Compact sludge lance.

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