A method of installing a jet pump for a water jet propelled fire fighting vessel

Abstract

This invention relates to the field of fireboat water pump installation technology, specifically to a method for installing a water-spraying propelled fireboat's water pump. The method includes: S1. Initially positioning the water inlet channel on the hull plate, allowing the outlet flange of the water inlet channel to extend into the pump chamber; S2. Placing a dummy pump fixture in the pump chamber, the dummy pump fixture including a dummy pump body, with dummy pump feet at the bottom of the dummy pump body. The dummy pump feet are first anchored to the outlet flange of the water inlet channel using locating pins, and then fixed with bolts; a dummy pump shaft, which is a round tube, is installed on the top of the dummy pump body; S3. Butt-welding the water inlet channel to the hull plate, monitoring the relative position changes of the dummy pump shaft and the steel wire in real time; S4. After welding the water inlet channel, marking the center line of the dummy pump shaft, disassembling the fixture from the outlet flange of the water inlet channel, replacing the fixture with the actual pump, and completing the water pump installation. This installation method avoids inaccurate positioning due to welding deformation of the water inlet channel causing the center line of the water inlet channel to shift, which in turn leads to the shift of the pump shaft center line, thus improving the positioning and alignment accuracy.

Description

Technical Field

[0001] This invention relates to the field of water jet propulsion pump installation technology for fireboats, and specifically to a method for installing a water jet propulsion pump for fireboats. Background Technology

[0002] The traditional installation method for waterjet propulsion pumps involves treating the pump compartment as a single section of the hull, welding it in place, and then boring holes or pouring epoxy resin on the stern plate. Currently, the existing technology for installing waterjet propulsion pumps involves first welding the inlet channel to the bottom plate, then hoisting the upper pump body into the pump compartment through an opening in the stern plate. The front half is installed inside the pump compartment, and the rear half is installed outside, with the front end resting on the inlet channel outlet flange. The upper pump body and the inlet channel outlet flange are first anchored to the locating pin holes along the bow and stern centerlines using locating pins, and then bolted together. This reduces the need for on-site boring or epoxy resin pouring.

[0003] In practical applications, to ensure that the ship's propulsion performance and center of gravity meet design requirements, onboard equipment must be placed in designated locations. For example, the waterjet propulsion pump is placed at the stern, while the engine driving the waterjet propulsion pump needs to be located in the middle of the ship to maintain hull balance. In this case, the waterjet propulsion pump requires an extended connecting shaft to connect to the engine. Therefore, the levelness requirement for the waterjet propulsion pump is extremely high. Otherwise, if the waterjet propulsion pump's main shaft centerline deviates beyond tolerance, the long connection will amplify this deviation. For example, the engine installation in the forward engine room might result in the epoxy gasket thickness exceeding the allowable range due to vertical axis deviation, or horizontal axis deviation causing the engine to collide with the base structure and prevent installation.

[0004] Currently, it is necessary to weld the water inlet channel, and then connect the upper spray pump body after the water inlet channel is positioned.

[0005] The water inlet channel is made of aluminum alloy, a material prone to welding deformation. Therefore, the water inlet channel is very susceptible to deformation during welding, requiring on-site alignment guidance for positioning and welding. The current alignment methods are: 1. Hoisting the upper spray pump body into the spray pump chamber for trial assembly and alignment. However, due to the narrow space in the spray pump chamber, this method is difficult, unsafe, time-consuming, and requires significant manpower. Specific technical problems encountered include: 2. Hoisting the upper spray pump body into the spray pump chamber for trial assembly and alignment after drilling holes in the tail seal plate. Because the initial holes were not fully drilled, hoisting is very difficult and could easily injure equipment or personnel, affecting equipment and personnel safety. 3. To monitor and control changes in the shaft centerline caused by welding deformation, on-site alignment measurement is needed. However, relying solely on the center markings made in the water inlet channel is far from sufficient, leading to uncertainty in welding quality, increasing construction difficulty, and affecting the project schedule. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for installing a water-spraying pump for a fireboat. This method can effectively avoid the problem that inaccurate positioning of the water inlet channel will affect the welding deformation of the water inlet channel and cause the water pump to be misaligned, thus effectively improving the positioning and alignment accuracy, and thereby improving the accuracy of the center line of the pump spindle.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for installing a spray pump for a water-jet propelled fireboat is provided, comprising the following steps:

[0009] S1. Initially position the water inlet channel on the bottom plate of the ship so that the inlet of the water inlet channel and the bottom plate are both on the horizontal plane; the outlet of the water inlet channel is equipped with a flange so that the outlet flange of the water inlet channel extends into the spray pump chamber and the outlet flange of the water inlet channel is inclined at a certain angle on the horizontal plane.

[0010] S2. Place a dummy pump fixture in the pump chamber, wherein the dummy pump fixture includes a dummy pump body, and a dummy pump foot is connected to the bottom of the dummy pump body. The dummy pump foot is inclined at a certain angle on the horizontal plane. The dummy pump foot is provided with two positioning pin holes. The line connecting the positioning pin holes is the center line extending along the dummy pump foot. First, use positioning pins to anchor the dummy pump foot and the water inlet outlet flange in the positioning pin holes. Then, use bolts to connect and fix the dummy pump foot and the water inlet outlet flange.

[0011] A dummy pump shaft is welded to the top of the dummy pump body. The dummy pump feet are round tubes, so that the ends of the dummy pump shaft are concentric and horizontal. A steel wire is passed through the dummy pump shaft and extended horizontally and tightened and fixed as the theoretical center line of the shaft system.

[0012] S3. Weld the water inlet channel to the bottom plate and observe in real time whether the relative position of the dummy pump shaft and the steel wire changes. If it changes, it means that the center line of the water inlet channel has shifted. Adjust the welding direction of the water inlet channel in time according to the direction of the shift of the dummy pump shaft and the steel wire. If it does not change, it means that the center line of the water inlet channel has not shifted.

[0013] S4. After the inlet channel welding is completed, mark the center line position of the dummy pump shaft. Disassemble the dummy pump fixture from the inlet channel outlet flange. Mark and cut the spray pump mounting hole on the stern sealing plate. Replace the dummy pump fixture with the real pump. Anchor the real pump to the inlet channel outlet flange with locating pins at the head and stern center locating pin holes, and then connect them with bolts. At the same time, check whether the thickness of the engine base gasket is within the allowable range according to the marked position of the dummy pump shaft center line, and whether there is any contact between the engine and the base structure. Align the shaft system between the real pump and the engine to complete the spray pump installation.

[0014] In some embodiments, the dummy pump foot includes a belly with wings extending from both sides of the belly, the belly and the wings forming an I-shape;

[0015] The inlet flow channel outlet flange is bolted to the wings on both sides, and the dummy pump body is welded to the abdomen.

[0016] In some embodiments, the wing portions are provided with bolt holes and positioning pin holes. The dummy pump feet are first anchored to the center positioning pin holes at the ends by positioning pins through the positioning pin holes, and then connected to the outlet flange of the water inlet channel by bolts through the bolt holes.

[0017] In some embodiments, the bottom of the dummy pump body is provided with a triangular elbow plate, with one right-angle side of the triangular elbow plate connected to the dummy pump body and the other right-angle side connected to the dummy pump foot.

[0018] In some embodiments, when the outlet flange of the water inlet channel is tilted upward, a triangular elbow plate is used to connect the dummy pump foot, so that the dummy pump foot is connected to the tilted outlet flange of the water inlet channel in the tilting direction.

[0019] In some embodiments, the tilt direction of the dummy pump foot is the same as the tilt direction of the inlet channel outlet flange, and the tilted end of the dummy pump foot is connected to the tilted outlet flange of the inlet channel, with the tilt angle of the tilted end of the dummy pump foot being the same as the tilt angle of the tilted outlet flange of the inlet channel.

[0020] In some embodiments, the step of adjusting the welding direction of the inlet channel in a timely manner according to the offset direction of the dummy pump shaft and the steel wire includes:

[0021] Observe the offset direction of the dummy pump shaft and the steel wire, move the water inlet channel in the opposite direction of the offset direction until the relative position of the dummy pump shaft and the steel wire is reset, and then weld the water inlet channel.

[0022] In some embodiments, a water platform is also provided on the top of the dummy pump shaft, and a level 10 is placed on the water platform. The direction of welding deformation or centerline offset of the water inlet channel is monitored in real time by observing the movement direction of the level bubble in the level 10.

[0023] In some implementations, in step S2, the steel wire is extended along the axis of the dummy pump shaft.

[0024] In some embodiments, the inlet flow channel outlet flange is bolted to the dummy pump foot or the real pump bolt.

[0025] The beneficial effects of the present invention regarding the installation method of a spray pump for a water-jet propelled fireboat are as follows:

[0026] (1) The method for installing a water-jet propulsion fireboat according to the present invention involves installing a dummy pump fixture in the pump compartment when installing the water inlet channel. The dummy pump fixture is connected to the water inlet channel to be welded via a dummy pump foot. A horizontal dummy pump shaft is provided on the top of the dummy pump body, and a horizontally extending steel wire passes through the dummy pump shaft. The bottom of the dummy pump body is also fixed on the dummy pump foot. Since the dummy pump foot is connected to the water inlet channel, when the water inlet channel shifts, the water inlet channel will cause the dummy pump foot to shift, and the dummy pump foot will also cause the dummy pump body to shift. At this time, the dummy pump shaft on the dummy pump body will change relative to the steel wire. By observing the change in relative position between the steel wire and the dummy pump shaft, it is possible to detect whether the water inlet channel has shifted in time, thereby adjusting the welding position of the water inlet channel in time to ensure that the water inlet channel does not shift.

[0027] (2) The method for installing the spray pump for a water-jet propelled fireboat according to the present invention uses a dummy pump fixture to position and weld the inlet channel before installing the real pump. The dummy pump fixture can monitor in a timely manner whether the center line of the outlet flange of the inlet channel is offset due to welding deformation, resulting in inaccurate positioning and thus offset of the pump main shaft center line. In addition, the dummy pump is easy to adjust, reducing the construction difficulty. The two ends of the dummy pump have a margin of safety to facilitate the welding and processing of the inlet channel. The center line of the inlet channel is determined by positioning pins and then bolted, which facilitates quick and accurate positioning. The relative positional relationship between the steel wire and the dummy pump shaft can truly represent the accuracy of the pump main shaft center line, which is used to monitor and measure axis changes and adjustments, providing reliable measurement data. Finally, the engine is connected to the real pump according to the center line of the dummy pump shaft system, realizing the precise connection of the engine and avoiding offset.

[0028] (3) The method for installing a water jet propulsion fireboat according to the present invention ensures the safety of the water jet pump, effectively controls the construction accuracy, ensures that the welding construction quality of the water inlet channel meets the requirements of shipbuilding quality standards, saves time, ensures the safety of ship equipment and construction personnel, and improves the performance of ship products. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the working state of the dummy pump tooling structure according to a specific embodiment of the present invention.

[0030] Figure 2 yes Figure 1 A cross-sectional view of one of the faces.

[0031] Figure 3 yes Figure 1 A cross-sectional view of another side of the middle.

[0032] Figure 4 This is a top view of the working state of the dummy pump tooling structure according to a specific embodiment of the present invention.

[0033] Figure 5This is a schematic diagram of the structure of the dummy pump foot in a specific embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of a method for installing a water-jet propulsion fireboat according to a specific embodiment of the present invention.

[0035] Figure label:

[0036] 1. Bottom plate; 2. Inlet channel; 3. Dummy pump foot; 31. Belly; 32. Wing; 4. Dummy pump body; 41. Square tube; 5. Dummy pump shaft; 6. Steel wire; 320. Locating pin hole; 321. Bolt hole; 8. Triangular elbow plate; 9. Water platform; 10. Level; 11. Channel outlet flange. Detailed Implementation

[0037] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Likewise, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0038] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” as used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0039] The water inlet channel is made of aluminum alloy, a material prone to welding deformation. Therefore, the water inlet channel is very susceptible to deformation during welding, requiring on-site alignment guidance for positioning and welding. The current alignment method involves hoisting the upper spray pump body into the spray pump chamber for trial assembly and alignment. However, due to the narrow space in the spray pump chamber, this method is difficult, unsafe, time-consuming, and requires significant manpower. Specific technical problems include: 1. Hoisting the upper spray pump body into the spray pump chamber for trial assembly and alignment after drilling holes in the tail seal plate is challenging because the initial holes were not fully drilled, making hoisting extremely difficult and increasing the risk of injury to equipment or personnel, thus affecting equipment and personnel safety. 2. To monitor and control changes in the shaft centerline caused by welding deformation, on-site alignment measurement is needed. However, relying solely on the center markings made in the water inlet channel is insufficient, leading to uncertainty in welding quality, increasing construction difficulty, and impacting the project schedule. To address these technical problems, the following implementation method is provided.

[0040] Example

[0041] Please see Figures 1-6 This embodiment discloses a method for installing a spray pump for a water-jet propulsion fireboat, including the following steps:

[0042] S1. Initially position the water inlet channel 2 on the bottom plate 1 so that the inlet of the water inlet channel 2 and the bottom plate 1 are both on the horizontal line; the outlet of the water inlet channel 2 is equipped with a flange so that the outlet flange of the water inlet channel 2 extends into the spray pump chamber and the outlet flange of the water inlet channel 2 is inclined at a certain angle on the horizontal plane.

[0043] Specifically, the water inlet channel 2 is welded to the aluminum bottom plate 1, and the base connecting the water inlet channel 2 to the actual pump extends into the pump chamber, which is used to install the actual pump and connect it to the water inlet channel 2. However, before installing the actual pump, a dummy pump fixture is used to replace it. The dummy pump fixture is used to position and monitor whether the water inlet channel 2 has shifted. After the water inlet channel 2 is positioned and welded, the dummy pump fixture can be directly replaced with the actual pump, and then the actual pump is connected to the water inlet channel 2.

[0044] S2. Place a dummy pump fixture in the pump chamber, wherein the dummy pump fixture includes a dummy pump body 4, and a dummy pump foot 3 is connected to the bottom of the dummy pump body 4. The dummy pump foot 3 is inclined at a certain angle on the horizontal plane. The dummy pump foot 3 is provided with two positioning pin holes 320. The line connecting the positioning pin holes 320 is the center line extending along the dummy pump foot 3. First, use positioning pins to anchor the dummy pump foot 3 and the outlet flange of the water inlet channel 2 in the positioning pin holes 320. Then, use bolts to fix the dummy pump foot 3 and the outlet flange of the water inlet channel 2.

[0045] A dummy pump shaft 5 is welded to the top of the dummy pump body 4. The dummy pump shaft 5 is a hollow round tube shaft, with the beginning and end of the dummy pump shaft 5 being concentric and horizontal. A steel wire 6 is passed through the dummy pump shaft 5 and extended horizontally and tightened and fixed as the theoretical center line of the shaft system.

[0046] Specifically, a dummy pump fixture is placed inside the pump chamber. The dummy pump body 4 in the dummy pump fixture has a dummy pump foot 3 at its bottom and a dummy pump shaft 5 at its top. The dummy pump foot 3 is connected to the outlet flange of the water inlet channel 2. When the water inlet channel 2 deforms or shifts, the water inlet channel 2 will cause the dummy pump foot 3 to move, which in turn will cause the dummy pump body 4 to move. The dummy pump shaft 5 on the dummy pump body 4 will then change its relative position with the steel wire 6. Based on this, it is possible to observe in real time whether the water inlet dummy pump shaft 5 has deformed.

[0047] S3. Butt weld the water inlet channel 2 to the bottom plate 1. Observe in real time whether the relative position of the dummy pump shaft 5 and the steel wire 6 changes. If it changes, it means that the center line of the water inlet channel 2 has shifted. Adjust the welding direction of the water inlet channel 2 in time according to the shift direction of the dummy pump shaft 5 and the steel wire 6. If it does not change, it means that the center line of the water inlet channel 2 has not shifted.

[0048] Specifically, during the welding process of the water inlet channel 2, since the water inlet channel 2 is made of aluminum and has a certain tilt angle, such as a tilt angle of 0°, the water inlet channel 2 will inevitably undergo some deformation during the welding process. Therefore, it is necessary to monitor in real time whether any displacement occurs during the welding process.

[0049] S4. After the inlet channel 2 is welded, mark the center line position of the main shaft of the dummy pump shaft 5. Disassemble the dummy pump fixture from the outlet flange of the inlet channel 2. Mark and cut the pump mounting hole on the stern sealing plate. Replace the dummy pump fixture with the real pump. Anchor the real pump to the outlet flange of the inlet channel 2 with locating pins at the 320-degree center locating pin holes at the stern and stern, and then connect them with bolts. At the same time, check whether the thickness of the engine base gasket is within the allowable range according to the marked position of the center line of the main shaft of the dummy pump shaft 5, and whether there is any contact between the engine and the base structure. Align the shaft system between the real pump and the engine to complete the pump installation.

[0050] Specifically, after welding is completed, the water inlet channel 2 has been welded and positioned. At this time, the dummy pump is replaced with the real pump, and the real pump is welded to the water inlet channel 2.

[0051] The above-mentioned method for installing the water-spraying pump on a fireboat employs a dummy pump fixture. First, the water inlet channel 2 is positioned and marked on the ship, saving time and effort and ensuring the safety of ship equipment and construction personnel. After positioning, the deformation of the base of the water inlet channel 2 during welding is monitored to guide the next welding direction. After the water inlet channel 2 is positioned and welded, the engine is connected to the real pump based on the center line of the dummy pump shaft 5. This ensures that the welding quality of key processes meets the requirements of the "China Shipbuilding Quality Standards" and improves the performance of ship products.

[0052] Please see Figure 5 In this embodiment, the dummy pump foot 3 includes an abdomen 31, and wings 32 extend from both sides of the abdomen 31, forming an I-shape with the abdomen 31 and the wings 32.

[0053] The outlet flange of the water inlet channel 2 is bolted to the wings 32 on both sides, and the dummy pump body 4 is welded to the abdomen 31.

[0054] Both sides 32 of the I-shaped dummy pump foot 3 can be easily installed on the outlet flange of the inlet channel 2. Specifically, the belly 31 of the I-shape is a mounting plate, through which the dummy pump foot 3 is welded to the dummy pump body 4; and another mounting plate extends from both sides of the I-shape as wings 32, which provide the dummy pump foot 3 with the installation position for the outlet flange of the inlet channel 2, so that the dummy pump foot 3 can be smoothly connected to the outlet flange of the inlet channel 2. Since the dummy pump body 4 is installed on the dummy pump foot 3, when the inlet channel 2 moves the dummy pump foot 3, the dummy pump foot 3 will also move the dummy pump body 4, which in turn moves the dummy pump shaft 5, realizing a change in the relative position between the dummy pump shaft 5 and the steel wire 6.

[0055] Please see Figure 5 In this embodiment, each of the wing portions 32 is provided with bolt holes 321 and positioning pin holes 320. The dummy pump foot 3 is bolted to the outlet flange of the water inlet channel 2 through the bolt holes 321, and the positioning pin holes 320 at the head and tail are anchored by positioning pins.

[0056] Specifically, the positioning pin hole 320 and bolt hole 321 are provided on the wing 32. The dummy pump foot 3 is first positioned by the positioning pin hole 320 and then fixed by the bolt through the bolt hole 321, so that the dummy pump foot 3 can be stably installed on the water inlet channel 2 and the dummy pump foot 3 can be stably installed on the dummy pump body 4.

[0057] Please see Figure 6 In this embodiment, the bottom of the dummy pump body 4 is provided with a triangular elbow plate 8, one right-angle side of the triangular elbow plate 8 is connected to the dummy pump body 4, and the other right-angle side is connected to the dummy pump foot 3.

[0058] The triangular elbow plate 8 serves to support the dummy pump body 4, so that the dummy pump body 4 can stand stably and will not shift unnecessarily due to instability. This ensures that the shift of the dummy pump body 4 is only caused by the shift of the water inlet channel 2, and ensures that the dummy pump body 4 can reflect the real shift of the water inlet channel 2.

[0059] Please see Figure 6 In this embodiment, when the outlet flange of the water inlet channel 2 is tilted upward, a triangular elbow plate 8 is used to connect the dummy pump foot 3, so that the dummy pump foot 3 is connected to the tilted outlet flange of the water inlet channel 2 in the tilting direction.

[0060] For example, in some cases, the outlet flange of the water inlet channel 2 is set with a 0° tilt angle. In order to adapt the dummy pump foot 3 to the tilt angle of the outlet flange of the water inlet channel 2, the dummy pump foot 3 is connected by a triangular elbow plate 8 so that the dummy pump foot 3 is connected to the outlet flange of the water inlet channel 2 in the tilt direction.

[0061] Please see Figure 1 In this embodiment, the tilt direction of the dummy pump foot 3 is the same as the tilt direction of the outlet flange of the inlet channel 2, and the tilt end of the dummy pump foot 3 is connected to the tilt outlet flange of the inlet channel 2. The tilt angle of the tilt end of the dummy pump foot 3 is the same as the tilt angle of the tilt outlet flange of the inlet channel 2.

[0062] Specifically, the dummy pump foot 3 is inclined along the direction that follows the tilt of the outlet flange of the inlet channel 2, and the dummy pump foot 3 will follow the same tilt angle as the outlet flange of the inlet channel 2.

[0063] In this embodiment, the step of adjusting the welding direction of the water inlet channel 2 in a timely manner according to the offset direction of the dummy pump shaft 5 and the steel wire 6 includes:

[0064] Observe the offset direction of the dummy pump shaft 5 and the steel wire 6, and move the water inlet channel 2 in the opposite direction of the offset direction until the relative position of the dummy pump shaft 5 and the steel wire 6 is reset. Then, spot weld the water inlet channel 2 together.

[0065] Specifically, the offset direction of the dummy pump shaft 5 and the steel wire 6 is the offset direction of the water inlet channel 2. At this time, the welding position of the water inlet channel 2 can be adjusted in the opposite direction, which provides intuitive guidance for the welding adjustment direction of the water inlet channel 2.

[0066] In this embodiment, a water platform 9 is also provided on the top of the dummy pump shaft 5, and a level 10 (not shown in the figure) is placed on the water platform 9. The direction of welding deformation or centerline offset of the water inlet channel 2 is monitored in real time by observing the movement direction of the level bubble in the level 10.

[0067] Specifically, the water platform 9 is a horizontal platform. The advantage of setting up a water platform 9 on top of the dummy pump shaft 5 is that it allows for observation of changes within the level gauge 10 on a horizontal surface. This level gauge 10 is a commercially available product. It utilizes the principle that a level bubble is centered to indicate horizontality, directly displaying angular displacement and measuring the degree of deviation of the measured surface from its horizontal, vertical, and tilted positions. During use, by observing the deviation of the level bubble on the level gauge 10, one can determine the direction in which the inlet channel 2 has deviated, and then adjust the welding in the opposite direction until the level bubble returns to its original position. Therefore, using the level gauge 10 further ensures the horizontality of the installation and prevents the inlet channel 2 from shifting.

[0068] In this embodiment, in step S2, the steel wire 6 extends along the axis of the dummy pump shaft 5.

[0069] The steel wire 6 extends through the axis of the dummy pump shaft 5 and is tightened and fixed as the theoretical center line of the shaft system. When observing whether the dummy pump shaft 5 and the steel wire 6 are offset, it is only necessary to observe whether the steel wire 6 is at the axis of the dummy pump shaft 5, which is convenient for observation.

[0070] In this embodiment, the dummy pump shaft 5 is an aluminum tube with a diameter of 100mm and a thickness of 8mm.

[0071] The dummy pump tooling is made of aluminum alloy, which is relatively lightweight, thus reducing the overall weight of the dummy pump tooling.

[0072] This method ensures that the dummy pump tooling meets the key characteristic values ​​required for the installation of a real pump. After processing, it is installed on the outlet flange of the inlet channel 2 and possesses the key characteristics of a real spray pump. Subsequently, the dummy pump tooling is positioned in the stern spray pump compartment, and the bottom plate 1 is butt-welded. During the subsequent formal welding process, the deformation of the welding construction of the inlet channel 2 is continuously monitored using the level 10 on the water platform 9 and the center line of the dummy pump shaft 5, guiding the next welding direction. After the positioning and welding of the inlet channel 2 is completed, the center line of the dummy pump shaft 5 guides the cutting of the remaining web plate of the engine mounting base and the positioning and welding of the panel, ensuring that the welding construction quality of the key process of the engine mounting base meets the requirements of the "China Shipbuilding Quality Standard".

[0073] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0074] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0075] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0076] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for installing a spray pump on a water-jet propelled fireboat, characterized in that, Includes the following steps: S1. Initially position the water inlet channel on the bottom plate of the ship so that the inlet of the water inlet channel and the bottom plate are on the horizontal line; the outlet of the water inlet channel is equipped with a flange so that the outlet flange of the water inlet channel extends into the spray pump chamber and the outlet flange of the water inlet channel is inclined at a certain angle on the horizontal plane. S2. Place a dummy pump fixture in the pump chamber, wherein the dummy pump fixture includes a dummy pump body, a dummy pump foot is connected to the bottom of the dummy pump body, the dummy pump foot is inclined at a certain angle on the horizontal plane, the dummy pump foot is provided with two positioning pin holes, the line connecting the positioning pin holes is the center line extending along the dummy pump foot, first use positioning pins to anchor the dummy pump foot and the water inlet outlet flange in the positioning pin holes, and then use bolts to fix the dummy pump foot and the water inlet outlet flange; A dummy pump shaft is welded to the top of the dummy pump body. The dummy pump shaft is a hollow circular tube shaft, with the beginning and end of the dummy pump shaft being concentric and horizontal. A steel wire is passed through the dummy pump shaft and extended horizontally and tightened and fixed as the theoretical center line of the shaft system. S3. Weld the water inlet channel to the bottom plate and observe in real time whether the relative position of the dummy pump shaft and the steel wire changes. If it changes, it means that the center line of the water inlet channel has shifted. Adjust the welding direction of the water inlet channel in time according to the direction of the shift of the dummy pump shaft and the steel wire. If it does not change, it means that the center line of the water inlet channel has not shifted. S4. After the inlet channel welding is completed, mark the center line position of the dummy pump shaft. Disassemble the dummy pump fixture from the inlet channel outlet flange. Mark and cut the spray pump mounting hole on the stern sealing plate. Replace the dummy pump fixture with the real spray pump. Anchor the real spray pump to the inlet channel outlet flange with locating pins at the head and tail center locating pin holes and then connect them with bolts. At the same time, check whether the thickness of the engine base gasket is within the allowable range according to the marked position of the dummy pump shaft center line, and whether there is any contact between the engine and the base structure. Align the shaft system between the real spray pump and the engine to complete the spray pump installation.

2. The method for installing a spray pump for a water-jet propulsion fireboat according to claim 1, characterized in that, The dummy pump foot includes a belly, with wings extending from both sides of the belly, and the belly and the wings forming an I-shape; The inlet flow channel outlet flange is bolted to the wings on both sides, and the dummy pump body is welded to the abdomen.

3. The method for installing a spray pump for a water-jet propulsion fireboat according to claim 2, characterized in that, Each of the wings is provided with bolt holes and positioning pin holes. The dummy pump foot is first anchored to the center positioning pin hole position at the head and tail through the positioning pin hole, and then connected to the outlet flange of the water inlet channel through the bolt hole.

4. The method for installing a spray pump for a water-jet propulsion fireboat according to claim 1, characterized in that, The bottom of the dummy pump body is provided with a triangular elbow plate, with one right-angle side of the triangular elbow plate connected to the dummy pump body and the other right-angle side connected to the dummy pump foot.

5. The method for installing a spray pump for a water-jet propulsion fireboat according to claim 4, characterized in that, When the outlet flange of the water inlet channel is tilted upward, a triangular elbow plate is used to connect the dummy pump foot, so that the dummy pump foot is connected to the tilted outlet flange of the water inlet channel in the tilting direction.

6. The method for installing a spray pump for a water-jet propulsion fireboat according to claim 5, characterized in that, The tilt direction of the dummy pump foot is the same as the tilt direction of the inlet channel outlet flange, and the tilt end of the dummy pump foot is connected to the tilt outlet flange of the inlet channel. The tilt angle of the tilt end of the dummy pump foot is the same as the tilt angle of the tilt outlet flange of the inlet channel.

7. The method for installing a spray pump for a water-jet propulsion fireboat according to claim 1, characterized in that, The step of adjusting the welding direction of the inlet channel in a timely manner according to the offset direction of the dummy pump shaft and the steel wire includes: Observe the offset direction of the dummy pump shaft and the steel wire, and move the water inlet channel in the opposite direction of the offset direction until the relative position of the dummy pump shaft and the steel wire is reset. Then, spot weld the water inlet channel together.

8. The method for installing a spray pump for a water-jet propulsion fireboat according to claim 1, characterized in that, A water platform is also set on the top of the dummy pump shaft, and a spirit level is placed on the water platform. The direction of welding deformation or centerline offset of the water inlet channel is monitored in real time by observing the movement direction of the bubble in the spirit level.

9. The method for installing a spray pump for a water-jet propulsion fireboat according to claim 1, characterized in that, In step S2, the steel wire is extended along the axis of the dummy pump shaft.

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