Spray pump impeller shaft sealing device and mounting method

Abstract

The invention discloses a spray pump impeller shaft sealing device and a mounting method, which are applied to ships propelled by water spraying. Comprising an annular steel washer, a circular through hole used for installing the annular steel washer is formed in a baffle according to the axis center line, and the axis center line penetrates through the circle center of the circular through hole; the outer circle of the annular steel washer is fixed on the circumference of the circular through hole, and the annular steel washer has margins on the two sides of the circular through hole; the sealing device located on the outer side of the baffle is fixed to the outer side face of the annular steel washer, and the inlet runner shaft pipe located on the inner side of the baffle is directly or indirectly fixed to the inner side face of the annular steel washer. The annular steel washer is welded in the through hole, the annular steel washer is directly fixed through the tool, the installation precision of a follow-up sealing device during installation is improved, and the perpendicularity of the installation plane of the sealing device and the center line of a shaft system is ensured. Moreover, the installation process of the sealing device is simplified, and the operation difficulty is reduced.

Description

Technical Field

[0001] The invention relates to ship technology, and in particular to a jet pump impeller shaft sealing device and an installation method. Background Art

[0002] In the ship water jet propulsion system, one end of the impeller shaft is connected to the impeller immersed in seawater, and the other end is connected to the shaft system in the cabin. In order to ensure the watertightness of the impeller shaft when passing through the inlet flow channel, a shaft tube is provided on the inlet flow channel, and a baffle is provided at the end of the shaft tube, and an impeller shaft sealing device is installed on the baffle.

[0003] At present, there are two main installation types of impeller shaft seals: Type 1 is to weld a steel washer on the inlet flow channel shaft tube baffle, and the impeller shaft seal is installed on the steel washer by screws, such as Figure 1 As shown; Type 2 is to first adjust the impeller shaft sealing device into place and then fix it with a tooling, then pour the epoxy pad 8 between the impeller shaft sealing device and the inlet flow channel shaft tube baffle, and finally use screws to connect the inlet flow channel shaft tube baffle and the sealing device through the epoxy pad, as shown Figure 2 shown.

[0004] The installation surface of the jet pump impeller shaft seal device must be vertical to the center line of the shaft system. Type 1 uses a steel washer directly welded to the inlet flow channel shaft tube baffle. The steel washer has a high verticality requirement. Since the deformation of the baffle during welding is difficult to control within the range required by the seal device, and the steel washer is difficult to process on site, this installation type is very difficult to construct. Type 2 is easier to achieve the installation requirements of the impeller shaft seal device in terms of technology, but the epoxy resin has poor impact resistance and is difficult to meet the impact resistance requirements of ships. Summary of the invention

[0005] In view of the above-mentioned defects in the prior art, a jet pump impeller shaft sealing device and an installation method are provided, which meet the installation requirements of the impeller shaft sealing device and adapt to the impact resistance environment of the ship.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] In the first aspect, a jet pump impeller shaft sealing device is used in a ship using water jet propulsion;

[0008] It includes an annular steel washer. According to the center line of the shaft system, a circular through hole for installing the annular steel washer is opened on the baffle, and the center line of the shaft system passes through the center of the circular through hole. The outer circle of the annular steel washer is fixed on the circumference of the circular through hole, and the annular steel washer has a margin on both sides of the circular through hole. The sealing device located on the outside of the baffle is fixed on the outer surface of the annular steel washer, and the inlet flow channel shaft tube located on the inside of the baffle is directly or indirectly fixed on the inner side surface of the annular steel washer.

[0009] According to the above technical solution, a transition installation tube is provided between the inner side surface of the annular steel washer and the inlet flow channel shaft tube, and the two ends of the transition installation tube are respectively fixedly connected to the inner end surface of the annular steel washer and the end of the inlet flow channel shaft tube.

[0010] According to the above technical solution, the transition mounting pipe adopts a trumpet-shaped pipe, and the cross-sectional dimensions at any point are circular; the dimension of the end of the transition mounting pipe close to the inlet flow channel shaft tube is the same as the end dimension of the inlet flow channel shaft tube, and the dimension of the end of the transition mounting pipe close to the annular steel washer is within the range of the inner diameter and outer diameter of the annular steel washer.

[0011] According to the above technical solution, the inner diameter of one end of the transition installation pipe close to the annular steel washer is the same as the inner diameter of the annular steel washer, and a chamfer is provided in the area of ​​the annular steel washer close to the transition installation pipe.

[0012] According to the above technical scheme, the sealing device is fixedly installed on the annular steel gasket by bolts, and a sealing structure is provided between the two; a double-sided welding fixed connection form is adopted between the inlet flow channel shaft tube and the transition mounting tube, between the transition mounting tube and the annular steel gasket, and between the annular steel gasket and the baffle.

[0013] In a second aspect, a method for installing a jet pump impeller shaft sealing device adopts any of the jet pump impeller shaft sealing devices described above, and the installation method includes: opening a circular through hole on the baffle plate, fixing the annular steel gasket in the annular through hole by means of tooling, and ensuring that the annular steel gasket and the mounting surface of the sealing device and the center line of the shaft system meet the verticality requirements; then welding the annular steel gasket to the circular through hole of the baffle plate.

[0014] According to the above technical solution, if the jet pump impeller shaft sealing device includes a transition installation pipe, the transition installation pipe is fixed on the inner side of the annular steel gasket before the annular steel gasket is fixed in the annular through hole by tooling.

[0015] According to the above technical solution, before the annular steel washer is fixed in the annular through hole by the tooling, a hole is punched according to the outer diameter of the annular steel washer with the intersection of the baffle and the center line of the shaft system as the center of the circle, and a certain margin gap is left.

[0016] According to the above technical solution, the length of the transition installation pipe is set according to demand; after determining the length of the transition installation pipe, the length of the inlet flow channel shaft pipe is determined according to the length of the transition installation pipe and the welding position of the transition installation pipe and the annular steel gasket.

[0017] According to the above technical solution, after the baffle and the annular steel gasket are welded and fixed, the transition installation pipe and the inlet flow channel pipe are welded and fixed first, and then the sealing device is fixed to the outer end face of the annular steel gasket by bolts.

[0018] The present invention has the following beneficial effects:

[0019] 1. Set a circular through hole on the baffle with the intersection of the center line of the shaft system and the baffle as the center of the circle. The size of the circular through hole is slightly larger than the outer ring size of the annular steel washer. Place the annular steel washer in the circular through hole. After the tooling adjusts the annular steel washer into place, fix the annular steel washer on the baffle by welding. At this time, whether the baffle is deformed due to welding will not affect the verticality of the end face of the annular steel washer and the center line of the shaft system. In addition, since the inlet flow channel shaft tube is subsequently directly or intermittently welded to the annular steel washer, it can effectively avoid the situation in the prior art that after the annular steel washer has been welded to the baffle, the inlet flow channel shaft tube is welded to the baffle again, causing the baffle to deform for the second time.

[0020] Based on the above structure, the annular steel gasket is directly fixed by the tooling to improve the installation accuracy of the subsequent sealing device and ensure the verticality between the installation plane of the sealing device and the center line of the shaft system. In addition, the installation process of the sealing device is simplified and the difficulty of the operation is reduced.

[0021] 2. Since the size of the existing sealing device is larger than the size of the inlet flow channel shaft tube, a transition installation tube is provided between the inner side of the annular steel gasket and the inlet flow channel shaft tube to facilitate the fixed connection of the inlet flow channel shaft tube and the sealing device on the annular steel gasket, or to reduce the size of the annular steel gasket.

[0022] 3. A chamfer is provided on the annular cylinder gasket to facilitate the welding of the transition mounting pipe and the annular steel gasket and to ensure the reliability of the welding between the two.

[0023] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 This is a schematic diagram of the direct welding installation of the steel washer and the baffle;

[0026] Figure 2 This is a schematic diagram of the pouring epoxy installation form;

[0027] Figure 3 It is a schematic diagram of the structure of the spray pump according to the embodiment of the present invention;

[0028] Figure 4 1. It is an installation diagram of a jet pump impeller shaft sealing device according to an embodiment of the present invention;

[0029] In the figure, 1. spray pump structure; 2. annular steel gasket; 3. baffle; 4. shaft system; 5. sealing device; 6. inlet flow channel shaft tube; 7. transition installation pipe; 8. epoxy gasket. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 The principles and features of the present invention are described, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. In the following paragraphs, the present invention is described in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0031] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] like Figure 1 As shown, in the existing structure, the inlet flow channel shaft tube is directly welded to the inner side of the baffle, the annular steel gasket is directly welded to the outer side of the baffle, and then the sealing device is installed on the other side of the annular steel gasket by bolts. The shaft system passes through the inlet flow channel shaft tube, the baffle, the annular steel gasket and the sealing device in sequence, and the sealing device is a common existing structure.

[0034] In this solution, the baffle plate is required to ensure the verticality between the plane where the annular steel gasket installation surface is located and the center line of the shaft system. On the one hand, since the two sides of the baffle plate need to be welded to the inlet flow channel shaft tube and the annular steel gasket respectively, the baffle plate will deform during the welding process, causing the verticality of the plane where the baffle plate is located and the center line of the shaft system to change, and the end face of the annular steel gasket will also change accordingly, making the installation position of the sealing device uncertain. On the other hand, when the annular steel gasket is welded to the baffle plate, it may be necessary to process the welding surface of the annular steel gasket on site, which increases the difficulty of on-site construction.

[0035] Reference Figure 1 to Figure 4 As shown, the jet pump impeller shaft sealing device provided by the present invention is applied to a ship using water jet propulsion, and a jet pump structure 1 is arranged inside the ship.

[0036] Example 1

[0037] It includes an annular steel washer 2. According to the center line of the shaft system, a circular through hole for installing the annular steel washer is opened on the baffle 3, and the center line of the shaft system 4 passes through the center of the circular through hole. The outer circle of the annular steel washer is fixed on the circumference of the circular through hole, and the annular steel washer has a margin on both sides of the circular through hole. The sealing device 5 located on the outside of the baffle is fixed on the outer surface of the annular steel washer, and the inlet flow channel shaft tube 6 located on the inside of the baffle is directly or indirectly fixed on the inner side surface of the annular steel washer.

[0038] In this embodiment, a circular through hole is set on the baffle with the intersection of the axis center line and the baffle as the center of the circle. The size of the circular through hole is slightly larger than the outer ring size of the annular steel washer. The annular steel washer is placed in the circular through hole. After the annular steel washer is adjusted into place by the tooling, the annular steel washer is fixed to the baffle by welding. At this time, whether the baffle is deformed due to welding will not affect the verticality of the end face of the annular steel washer and the axis center line. In addition, since the inlet flow channel shaft tube is subsequently directly or intermittently welded to the annular steel washer, it can effectively avoid the situation in the prior art that the inlet flow channel shaft tube is welded to the baffle after the annular steel washer has been welded to the baffle, causing the baffle to deform.

[0039] Based on the above structure, the annular steel gasket is directly fixed by the tooling to improve the installation accuracy of the subsequent sealing device, ensure the verticality of the installation plane of the sealing device and the center line of the shaft system, and meet the runout tolerance of the contact installation surface of the annular steel gasket and the sealing device, and the verticality tolerance of the contact installation surface of the shaft system center line and the sealing device less than 0.1mm.

[0040] Example 2

[0041] The structure and principle of the second embodiment are similar to those of the first embodiment, except that: since the size of the existing sealing device is larger than the size of the inlet flow channel shaft tube, in order to facilitate the fixed connection of the two on the annular steel gasket or to reduce the size of the annular steel gasket, a transition installation tube 7 is provided between the inner side surface of the annular steel gasket and the inlet flow channel shaft tube, and the two ends of the transition installation tube are respectively fixedly connected to the inner end surface of the annular steel gasket and the end of the inlet flow channel shaft tube.

[0042] In Example 2, the transition mounting tube adopts a trumpet-shaped pipe or a conical pipe, and the cross-sectional dimensions at any point are circular; the dimension of the end of the transition mounting tube close to the inlet flow channel shaft tube is the same as the end dimension of the inlet flow channel shaft tube, and the dimension of the end of the transition mounting tube close to the annular steel washer is within the range of the inner diameter and outer diameter of the annular steel washer.

[0043] Preferably, the inner diameter of one end of the transition mounting tube close to the annular steel washer is the same as the inner diameter of the annular steel washer. In order to facilitate the welding connection between the annular steel washer and the transition mounting tube, a chamfer is provided in the area of ​​the annular steel washer close to the transition mounting tube.

[0044] In Examples 1 and 2, the sealing device is fixedly mounted on the annular steel gasket by bolts, and a sealing structure is provided between the two; a double-sided welding fixed connection form is adopted between the inlet flow channel shaft tube and the transition installation tube, between the transition installation tube and the annular steel gasket, and between the annular steel gasket and the baffle. The double-sided welding means that both sides of the contact surface of the two components are welded, as shown in the figure.

[0045] The present invention also provides a method for installing a jet pump impeller shaft sealing device, using any of the above-described jet pump impeller shaft sealing devices.

[0046] Example 1

[0047] Installation methods include:

[0048] S1: With the intersection of the baffle and the center line of the shaft system as the center of the circle, punch a hole according to the outer diameter of the annular steel washer and leave a certain margin gap.

[0049] S2: A circular through hole is opened on the baffle, and the annular steel gasket is fixed in the annular through hole by a fixture, and the position of the annular steel gasket is adjusted to ensure that the mounting surface of the annular steel gasket and the center line of the shaft system meet the verticality requirements; then the annular steel gasket is welded to the circular through hole of the baffle.

[0050] S3: After the baffle and the annular steel gasket are welded and fixed, the annular steel gasket and the inlet flow channel are welded and fixed first, and then the sealing device is fixed to the outer end face of the annular steel gasket by bolts. During the installation of the sealing device on the annular steel gasket, the annular steel gasket is checked again. After confirming that there is no damage, no defects and the tolerance meets the requirements, the sealing device and the annular steel gasket are assembled according to the installation requirements of the sealing device.

[0051] With this installation method, the on-site installation workflow is simple and there is no need for on-site personnel to process the structure according to the centering result of the sealing device; the welding surface is small, the welding quality is controllable, and the thermal deformation is small; after installation, the sealing device can adapt to the impact-resistant environment.

[0052] Example 2

[0053] S1: Fix the transition installation pipe on the inner side of the annular steel washer. Specifically, the annular steel washer and the transition installation pipe are pre-processed in the workshop, and the parts are ensured to meet the tolerance requirements, and the annular steel washer and the transition installation pipe are connected by double-sided welding.

[0054] S2: With the intersection of the baffle and the center line of the shaft system as the center of the circle, punch a hole according to the outer diameter of the annular steel washer and leave a certain margin gap.

[0055] S3: Open a circular through hole on the baffle, fix the annular steel washer in the circular through hole by a fixture, adjust the position of the annular steel washer and ensure that the mounting surface of the annular steel washer and the center line of the shaft system meet the verticality requirements; then weld the annular steel washer to the circular through hole of the baffle.

[0056] S4: After the baffle and the annular steel gasket are welded and fixed, the transition installation pipe and the inlet flow channel pipe are welded and fixed first, and then the sealing device is fixed to the outer end face of the annular steel gasket by bolts. During the installation of the sealing device on the annular steel gasket, the annular steel gasket is checked again. After confirming that there is no damage, no defects and the tolerance meets the requirements, the sealing device and the annular steel gasket are assembled according to the installation requirements of the sealing device.

[0057] Among them, in Example 2, S1 and S2 can be interchanged.

[0058] In Examples 1 and 2 of the installation method of the above-mentioned jet pump impeller shaft sealing device, the length of the transition mounting pipe is set according to demand; after determining the length of the transition mounting pipe, the length of the inlet flow channel shaft pipe is determined according to the length of the transition mounting pipe and the welding position of the transition mounting pipe and the annular steel gasket, and the processing is completed on site.

[0059] In addition, during the assembly process, parts are not allowed to be knocked, hit, scratched or rusted. All welds should be polished and painted.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. Jet pump impeller shaft sealing device, used in ships using water jet propulsion; Features: It includes an annular steel washer. According to the center line of the shaft system, a circular through hole for installing the annular steel washer is opened on the baffle, and the center line of the shaft system passes through the center of the circular through hole. The outer circle of the annular steel washer is fixed on the circumference of the circular through hole, and the annular steel washer has a margin on both sides of the circular through hole. The sealing device located on the outside of the baffle is fixed on the outer surface of the annular steel washer, and the inlet flow channel shaft tube located on the inside of the baffle is directly or indirectly fixed on the inner side surface of the annular steel washer.

2. The jet pump impeller shaft sealing device according to claim 1, characterized in that: A transition installation pipe is arranged between the inner side of the annular steel washer and the inlet flow channel shaft pipe, and the two ends of the transition installation pipe are respectively fixedly connected to the inner end surface of the annular steel washer and the end of the inlet flow channel shaft pipe.

3. The jet pump impeller shaft sealing device according to claim 2, characterized in that: The transition installation pipe adopts a trumpet-shaped pipe, and the cross-sectional dimensions at any point are circular; the dimension of the end of the transition installation pipe close to the inlet flow channel shaft pipe is the same as the end head dimension of the inlet flow channel shaft pipe, and the dimension of the end of the transition installation pipe close to the annular steel washer is within the inner diameter and outer diameter range of the annular steel washer.

4. The jet pump impeller shaft sealing device according to claim 3, characterized in that: The inner diameter of one end of the transition installation pipe close to the annular steel washer is the same as the inner diameter of the annular steel washer, and a chamfer is arranged in the area of ​​the annular steel washer close to the transition installation pipe.

5. The jet pump impeller shaft sealing device according to claim 2, characterized in that: The sealing device is fixedly installed on the annular steel gasket by bolts, and a sealing structure is provided between the two; a double-sided welding fixed connection form is adopted between the inlet flow channel shaft tube and the transition mounting tube, between the transition mounting tube and the annular steel gasket, and between the annular steel gasket and the baffle.

6. The installation method of the jet pump impeller shaft sealing device is characterized by: A jet pump impeller shaft sealing device as described in any one of claims 1 to 5 is used, and the installation method includes: opening a circular through hole on the baffle, fixing the annular steel gasket in the annular through hole by means of tooling, and ensuring that the annular steel gasket and the mounting surface of the sealing device and the center line of the shaft system meet the verticality requirements; and then welding the annular steel gasket to the circular through hole of the baffle.

7. The method for installing the jet pump impeller shaft sealing device according to claim 6, characterized in that: If the jet pump impeller shaft sealing device includes a transition installation pipe, the transition installation pipe is fixed on the inner side surface of the annular steel gasket before the annular steel gasket is fixed in the annular through hole by the tooling.

8. The method for installing the jet pump impeller shaft sealing device according to claim 6 or 7, characterized in that: Before the annular steel washer is fixed in the annular through hole by the tooling, a hole is punched according to the outer diameter of the annular steel washer with a certain margin gap, taking the intersection of the baffle and the center line of the shaft system as the center of the circle.

9. The method for installing the jet pump impeller shaft sealing device according to claim 7, characterized in that: The length of the transition installation pipe is set according to the demand; after the length of the transition installation pipe is determined, the length of the inlet flow channel shaft pipe is determined according to the length of the transition installation pipe and the welding position of the transition installation pipe and the annular steel gasket.

10. The method for installing the jet pump impeller shaft sealing device according to claim 6, characterized in that: After the baffle and the annular steel gasket are welded and fixed, the transition installation pipe and the inlet flow channel pipe are welded and fixed first, and then the sealing device is fixed to the outer end face of the annular steel gasket by bolts.

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