Special tool for dismantling impeller of large axial flow pump

Abstract

The utility model relates to a special tool for dismantling an impeller of a large axial flow pump. The special tool for dismantling the impeller of the large axial flow pump comprises a top shaft and a jack, and further comprises two sets of pull rods which are symmetrically arranged, round holes are formed in one ends of the pull rods, square holes are formed in the other ends of the pull rods, and cross beams are inserted into the square holes; wherein the cross beam is fixed with the bottom of the jack, and the top of the jack is connected with the bottom of the top shaft. As one end of the pull rod is fixed with the impeller through the round hole, the other end of the pull rod is fixed with the cross beam through the square hole, and no welding seam is generated between the pull rod and the cross beam, the tool is not easy to crack and deform in the dismounting process, and the dismounting operation can be continuously carried out.

Description

Technical Field

[0001] The present application relates to the technical field of axial flow pumps, and in particular to a special tool for removing an impeller of a large axial flow pump. Background Art

[0002] An axial flow pump is a pump that transports liquid along the axis by the force exerted by the blades of the impeller. The impeller of a common axial flow pump includes the following components: an impeller hub, 2 to 7 blades mounted on the impeller hub, and a moving impeller head mounted at the end of the impeller hub. The impeller hub, blades, and moving impeller head together form an impeller. The impeller rotates in a cylindrical pump casing. Fixed guide vanes are installed on the pump casing above the impeller to eliminate the rotational motion of the liquid, convert it into axial motion, and convert the kinetic energy of the rotational motion into pressure energy. Axial flow pumps are mainly suitable for low-head and high-flow applications, such as irrigation, drainage, dock drainage, water level regulation of canal locks, or as large circulating water pumps in power plants. Axial flow pumps with higher head (made into two stages when necessary) can be used for water jet propulsion of shallow-water ships.

[0003] At present, the impeller is removed by combining the temperature difference method and the top pressure method. The top pressure method requires the use of disassembly tools, such as Figure 4 As shown, the disassembly tool consists of a ring 1, two tie rods 2 and a cross beam 3. One end of the tie rod 2 is welded to the end face of the ring 1, and the other end is welded and fixed to the cross beam 3. The basic process is as follows: the ring 1 is connected to the impeller mouth ring with bolts to fix the tool on the impeller, a bracket is placed to support the tie rod 2, a top shaft 4 and a jack 5 are placed between the two tie rods 2, and the jack 5 is fixed on the cross beam 3, and then the impeller hub is heated to expand due to the heat, and then the top shaft 4 is pushed by the jack 5 to apply an axial thrust to the impeller shaft, and the impeller is slowly pulled out and separated from the impeller shaft.

[0004] However, during the disassembly process of the conventional disassembly tool, the welds between the pull rod 2 and the ring 1 and the crossbeam 3 are prone to cracking, thereby causing the tool to deform and the disassembly operation to be forced to be stopped. Utility Model Content

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a special tool for removing the impeller of a large axial flow pump.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] A special tool for removing a large axial flow pump impeller, comprising a top shaft and a jack, and the special tool for removing a large axial flow pump impeller also includes:

[0008] Two sets of tie rods are symmetrically arranged, one end of the tie rod is provided with a round hole, the other end is provided with a square hole, and a crossbeam is inserted into the square hole;

[0009] The crossbeam is fixed to the bottom of the jack, and the top of the jack is connected to the bottom of the top shaft.

[0010] Optionally, the end of the pull rod with the circular hole is in the shape of a circular ring, the outer diameter of the circular ring is 220 mm, and the inner diameter of the circular hole is 120 mm.

[0011] Optionally, the square hole is 122 mm long and 72 mm wide.

[0012] Optionally, the crossbeam is 400 mm long, 120 mm wide and 72 mm thick.

[0013] Optionally, the pull rod and the cross beam are made of Q235 carbon steel.

[0014] Optionally, the large axial flow pump impeller removal special tool is sprayed with an anti-rust paint layer as a whole.

[0015] Beneficial effects of the present application: Since one end of the tie rod is fixed to the impeller through a round hole and the other end is fixed to the cross beam through a square hole, no weld is produced between the tie rod and the cross beam. Therefore, during the disassembly process, the tool is not prone to cracking and deformation, allowing the disassembly operation to continue.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0018] Figure 1 It is a top view of a special tool for removing a large axial flow pump impeller shown in an embodiment of the present application;

[0019] Figure 2 It is a front view of a special tool for removing a large axial flow pump impeller shown in an embodiment of the present application;

[0020] Figure 3 is a side view of a pull rod shown in an embodiment of the present application;

[0021] Figure 4 It is a structural schematic diagram of a traditional disassembly tool in the background technology of this application.

[0022] Figure numerals: 1 circular ring, 2 pull rod, 3 cross beam, 4 top shaft, 5 jack, 6 round hole, 7 square hole, 8 rotating rod. DETAILED DESCRIPTION

[0023] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific situation.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0028] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0029] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0030] In order to make the purpose, technical solutions and beneficial effects of the present application clearer, the preferred embodiments of the present application will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technical personnel.

[0031] Embodiment 1:

[0032] See also Figure 1 , Figure 2 and Figure 3 , a special tool for removing a large axial flow pump impeller, comprising a top shaft 4 and a jack 5, and the special tool for removing a large axial flow pump impeller also includes:

[0033] Two sets of tie rods 2 are symmetrically arranged, one end of the tie rod 2 is provided with a round hole 6, the other end is provided with a square hole 7, and a crossbeam 3 is inserted into the square hole 7;

[0034] The cross beam 3 is fixed to the bottom of the jack 5 , and the top of the jack 5 is connected to the bottom of the top shaft 4 .

[0035] Specifically, the two groups of tie rods 2 are symmetrically arranged on both sides of the top shaft 4 with the top shaft 4 as the symmetry center. A round hole 6 is opened at one end of the tie rod 2, and the round hole 6 matches the nut in the impeller ring. A square hole 7 is opened at the other end of the tie rod 2, and the square hole 7 matches the size of the crossbeam 3 so that the crossbeam 3 can be inserted into the square hole 7. The length of the crossbeam 3 is greater than the spacing between the two groups of tie rods 2.

[0036] When in use, extend one end of the two sets of tie rods 2 with round holes 6 into the impeller mouth ring, and a nut is provided in the impeller mouth ring. The round hole 6 is sleeved on the nut to fix the tie rod 2 and the impeller of the axial flow pump, and one end of the cross beam 3 passes through the two square holes 7 in sequence, so that the cross beam 3 is inserted into the tail of the tie rod 2, and the bottom of the jack 5 is fixed to the side wall of the cross beam 3, and the top of the jack 5 is connected to the bottom of the top shaft 4, and the top of the top shaft 4 abuts the impeller shaft. The tool is placed on the bracket so that the tie rod 2 and the jack 5 are supported to prevent the two from floating in the air, and then the impeller hub is heated to expand due to the heat, and then the rotating rod 8 of the jack 5 is rotated so that the jack 5 pushes the top shaft 4 to move toward the end away from the cross beam 3, and the top shaft 4 applies axial thrust to the impeller shaft, and the impeller is slowly pulled out and separated from the impeller shaft, thereby completing the disassembly operation;

[0037] In this embodiment, since one end of the tie rod 2 is fixed to the impeller through the round hole 6, and the other end is fixed to the cross beam 3 through the square hole 7, no weld is generated between the tie rod 2 and the cross beam 3. Therefore, during the disassembly process, the tool is not prone to cracking and deformation, so that the disassembly operation can be carried out continuously.

[0038] In addition, when installing the ring 1, the traditional disassembly tool needs to use multiple bolts to fix the ring 1 to the impeller, and the installation process is time-consuming. In this embodiment, only two circular holes 6 need to be sleeved on the nuts in the impeller mouth ring to fix the tie rod 2 to the impeller, which effectively reduces the installation time.

[0039] In addition, during the disassembly process of conventional disassembly tools, bolts are prone to breakage, which may cause the bolts to fly out and cause danger. In the present embodiment, the round hole 6 is sleeved on the nut to fix the tie rod 2 to the impeller, thereby avoiding the phenomenon of bolts flying out and causing danger.

[0040] Embodiment 2:

[0041] See also Figure 1 , Figure 2 and Figure 3 Based on the first embodiment, further and optionally, the end of the pull rod 2 with the circular hole 6 is in a circular ring shape, the outer diameter of the circular ring is 220 mm, and the inner diameter of the circular hole 6 is 120 mm.

[0042] Specifically, the outer diameter of the ring is reasonably set according to the inner diameter of the impeller ring. In the present embodiment, the outer diameter of the ring is set to 220 mm according to the inner diameter of the impeller ring of the axial flow pump impeller that needs to be disassembled this time, so as to facilitate the end of the pull rod 2 to smoothly extend into the impeller ring. Since the outer diameter of the nut in the impeller ring is 120 mm, the inner diameter of the circular hole 6 is also set to 120 mm, so as to facilitate the circular hole 6 to be fastened to the nut.

[0043] Further and optionally, the square hole 7 is 122 mm long and 72 mm wide.

[0044] Specifically, the width of one end of the pull rod 2 with the square hole 7 is 220 mm, which is consistent with the outer diameter of the ring. The square hole 7 is 122 mm long and 72 mm wide, and its length and width dimensions match those of the beam 3 to facilitate the insertion and fixation of the beam 3.

[0045] Further and optionally, the crossbeam 3 is 400 mm long, 120 mm wide and 72 mm thick.

[0046] Specifically, the length of the crossbeam 3 is 400 mm, which is greater than the spacing between the two sets of pull rods 2, so that after the crossbeam 3 is fixed in the square hole 7, it can extend a little further, thereby ensuring that the crossbeam 3 is not easy to slide out when the jack 5 applies force; the width of the crossbeam 3 is consistent with the length of the square hole 7, and the thickness of the crossbeam 3 is consistent with the width of the square hole 7. The two match each other and are tightly connected.

[0047] Further and optionally, the pull rod 2 and the cross beam 3 are made of Q235 carbon steel.

[0048] Specifically, Q235 carbon steel is a low-carbon steel with excellent plasticity and toughness, and its strength and hardness are relatively high. Its tensile strength is not less than 370MPa, and its yield point is not less than 235MPa. In the construction field, Q235 carbon steel is often used to make steel bars, steel plates, steel sections, etc., and has good bearing capacity and durability;

[0049] In addition, Q235 carbon steel also has good processing performance and can be processed by bending, curling, etc.

[0050] Compared with other high-strength steels, Q235 carbon steel has lower cost and lighter weight, which can reduce the overall weight of the tool.

[0051] Further and optionally, the special tool for removing the large axial flow pump impeller is sprayed with an anti-rust paint layer as a whole.

[0052] Specifically, the anti-rust paint layer can protect the tool surface from chemical or electrochemical corrosion from the atmosphere, water, etc., and can effectively avoid the direct invasion of various corrosive substances in the atmosphere, thereby maximizing the service life of the tool.

[0053] In summary, in the present application, since one end of the tie rod 2 is fixed to the impeller through the round hole 6, and the other end is fixed to the cross beam 3 through the square hole 7, no weld is generated between the tie rod 2 and the cross beam 3, so during the disassembly process, the tool is not prone to cracking and deformation, so that the disassembly operation can be carried out continuously;

[0054] In addition, when installing the ring 1, the traditional disassembly tool needs to use multiple bolts to fix the ring 1 to the impeller, and the installation process is time-consuming. In the present application, only two circular holes 6 need to be sleeved on the nuts in the impeller mouth ring to fix the tie rod 2 to the impeller, which effectively reduces the installation time.

[0055] In addition, during the disassembly process of conventional disassembly tools, bolts are easily broken, which may cause the bolts to fly out and cause danger. In the present application, the round hole 6 is sleeved on the nut to fix the tie rod 2 and the impeller, thereby avoiding the phenomenon of bolts flying out and causing danger.

[0056] The tie rod 2 and the cross beam 3 of the present application are made of Q235 carbon steel, which is easy to process, low in cost and light in weight while ensuring strength;

[0057] The present application sprays an anti-rust paint layer on the tool surface, which can protect the tool surface from chemical or electrochemical corrosion from the atmosphere, water, etc., and can effectively avoid the direct invasion of various corrosive substances in the atmosphere, thereby maximizing the service life of the tool.

[0058] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A special tool for removing the impeller of a large axial flow pump, comprising a top shaft (4) and a jack (5), characterized in that: The special tool for removing the large axial flow pump impeller also includes: Two sets of pull rods (2) are symmetrically arranged, one end of the pull rod (2) is provided with a round hole (6), the other end is provided with a square hole (7), and a crossbeam (3) is inserted into the square hole (7); The crossbeam (3) is fixed to the bottom of the jack (5), and the top of the jack (5) is connected to the bottom of the top shaft (4).

2. The special tool for removing the impeller of a large axial flow pump according to claim 1, characterized in that: One end of the pull rod (2) with a circular hole (6) is in a circular ring shape, the outer diameter of the circular ring is 220 mm, and the inner diameter of the circular hole (6) is 120 mm.

3. The special tool for removing the impeller of a large axial flow pump according to claim 1, characterized in that: The square hole (7) is 122 mm long and 72 mm wide.

4. The special tool for removing the impeller of a large axial flow pump according to claim 1, characterized in that: The crossbeam (3) is 400 mm long, 120 mm wide and 72 mm thick.

5. The special tool for removing the impeller of a large axial flow pump according to claim 1, characterized in that: The pull rod (2) and the cross beam (3) are made of Q235 carbon steel.

6. The special tool for removing the impeller of a large axial flow pump according to claim 1, characterized in that: The large-scale axial flow pump impeller removal special tool is sprayed with an anti-rust paint layer on its entirety.

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