Tool for disassembling and assembling impeller of axial flow pump

Abstract

The utility model discloses an axial flow pump impeller disassembling and assembling tool which comprises a rod piece, the rod piece is divided into a first section and a second section, the outer diameter of the second section is larger than that of the first section, and the outer diameter of the second section is equal to that of a pump shaft; the puller assembly comprises at least two hook claws; when the tool is used for disassembling the impeller, the end, away from the first section, of the second section of the rod piece abuts against the tail end of the pump shaft, the upper edge of the second section of the rod piece is flush with the upper edge of the pump shaft, and an ejector rod of the puller assembly abuts against the end, away from the second section, of the first section of the rod piece. When the tool is used for disassembling the impeller, the propeller hub of the impeller can be stably transferred to the rod piece, due to the fact that the outer diameter of the first section of the rod piece is smaller than that of the second end of the rod piece, the propeller hub of the impeller can easily slide on the rod piece, and when the propeller hub of the impeller is completely pulled out of a pump shell, the propeller hub and the impeller are lifted to a preset area through the lifting belt.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump body overhauling tool field, concretely is a kind of axial flow pump impeller dismounting tool. BACKGROUND

[0002] It is known that an axial flow pump impeller is composed of four blades and a circular hub. The impeller nut is inside the hub to fix the impeller on the pump shaft. When disassembled with conventional tools, after the impeller nut is removed, it is difficult to safely lift the impeller out of the pump shell to the maintenance area directly due to the large weight of the impeller itself and the lack of lifting points. It is urgent to design a dismounting tool for an axial flow pump impeller with a circular hub. SUMMARY

[0003] To overcome the defects in the prior art, the utility model provides an axial flow pump impeller dismounting tool. When disassembling the impeller using the tool, one end of the second section of the rod away from the first section is connected to the end of the pump shaft, the top rod of the drawbar assembly abuts against one end of the first section of the rod away from the second section, the claws of the drawbar assembly catch the hub of the impeller, and the hub of the impeller is pulled from the pump shaft to the rod by the drawbar assembly. Since the outer diameter of the second section of the rod is equal to the outer diameter of the pump shaft, the hub of the impeller can be smoothly transferred to the rod. Since the outer diameter of the first section of the rod is smaller than the outer diameter of the second end, the hub of the impeller can easily slide on the rod until the hub of the impeller is completely pulled out of the pump shell. The hub with the impeller is lifted to the preset area by the lifting belt.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of an axial flow pump impeller dismounting tool, which comprises:

[0005] a rod, which is divided into a first section and a second section, the outer diameter of the second section is greater than that of the first section, and the outer diameter of the second section is equal to that of the pump shaft;

[0006] a drawbar assembly, which comprises at least two claws;

[0007] When disassembling the impeller using the tool, one end of the second section of the rod away from the first section abuts against the end of the pump shaft, and the upper edge of the second section of the rod is flush with the upper edge of the pump shaft. The top rod of the drawbar assembly abuts against one end of the first section of the rod away from the second section.

[0008] By the above scheme, when the above tool is used to disassemble the impeller, one end of the second section of the rod away from the first section is connected with the end of the pump shaft, the ejector rod of the ejector assembly abuts against one end of the first section of the rod away from the second section, the hook of the ejector assembly clamps the hub of the impeller, the hub of the impeller is pulled from the pump shaft to the rod by the ejector assembly, since the outer diameter of the second section of the rod is equal to the outer diameter of the pump shaft, the hub of the impeller can be smoothly transferred to the rod, since the outer diameter of the first section of the rod is smaller than the outer diameter of the second section, the hub of the impeller can easily slide on the rod until the hub of the impeller is completely pulled out of the pump shell, and the hub with the impeller is hoisted to a preset area by the hoisting belt.

[0009] Further, a first connecting section is arranged between the first section and the second section, and an outer wall surface of the first connecting section forms an angle of 10-20° with the first section. A slope of 10-20° is arranged between the first section and the second section as a buffer, so that the hub can smoothly slide from the second section to the first section of the rod. Compared with a step structure, the hub will obviously drop when sliding from the second section to the first section, so that the hub collides with the first section and can be damaged.

[0010] Further, an outer wall surface of the first connecting section forms an angle of 15° with the first section. The design of 15° will not make the first connecting section too long, and is relatively gentle.

[0011] Further, one end of the first section of the rod away from the second section is concave to form an interface, and the ejector rod of the ejector assembly can be inserted into the interface. The ejector rod of the ejector assembly is inserted into the interface, so as to avoid misalignment of the ejector rod and the rod when the ejector rod pulls the hub.

[0012] Further, when the second section of the rod is connected with the end of the pump shaft, the first section of the rod extends to the outside of the pump shell. The hoisting belt can directly hoist the hub along the rod out of the pump shell.

[0013] Further, a shaft sleeve is arranged, the shaft sleeve is detachably connected with the rod, the shaft sleeve is divided into a third section and a fourth section, the fourth section is sleeved outside the second section of the rod, the third section is sleeved outside the first section of the rod, the outer diameter of the fourth section is greater than that of the third section, and the outer diameter of the fourth section is less than or equal to the outer diameter of the pump shaft. The mutual friction between the hub and the rod can damage the surface of the rod and form barbs, which hinders the sliding of the hub and affects the disassembly efficiency. Therefore, a detachable shaft sleeve is sleeved outside the rod, and if the surface of the shaft sleeve forms barbs, the shaft sleeve can be replaced.

[0014] Further, a second connecting section is arranged between the third section and the fourth section of the shaft sleeve, and an angle between the second connecting section and the third section is 15°. The shaft sleeve also has a slope of 15° as a buffer for the sliding of the hub.

[0015] Furthermore, a stop block is provided at one end of the first section of the rod away from the second section, and the outer diameter of the stop block is larger than the inner diameter of the first section of the sleeve. The stop block is used to hold the sleeve in place to ensure that the sleeve remains in contact with the pump shaft during disassembly.

[0016] Furthermore, the shaft sleeve is clearance-fitted with the rod, and the rod can rotate relative to the shaft sleeve.

[0017] Furthermore, a step portion that matches the end of the pump shaft is provided on a side of the fourth section of the sleeve that is away from the third section.

[0018] Furthermore, the puller assembly includes:

[0019] A support, wherein the support is provided with a threaded hole;

[0020] A push rod, wherein the surface of the push rod is provided with a thread, the push rod passes through the threaded hole of the support and is threadedly connected to the support;

[0021] At least two hooks are provided on the support, and the hooks are distributed on both sides of the push rod.

[0022] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0023] In the present application, a rod is provided to abut between the pump shaft and the top rod of the puller, and the rod is divided into a first section and a second section. The outer diameter of the second section is less than or equal to the outer diameter of the pump shaft. When the tool is used to disassemble the impeller, the upper edge of the second section of the rod is flush with the upper edge of the pump shaft, so that the propeller hub can be smoothly transferred from the pump shaft to the rod. The outer diameter of the first section of the rod is smaller than that of the second section, and a 15° connecting section is provided between the first section and the second section. After the propeller hub slides smoothly from the second section to the first section through the 15° connecting section, the propeller hub can be directly lifted out of the pump casing along the rod by using a sling;

[0024] The present application provides a detachable sleeve on the outside of the rod to prevent the friction between the hub and the rod from causing the surface of the rod to be worn and burred. If the sleeve is worn, it can be directly replaced.

[0025] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some of the embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort on the premise that the accompanying drawings are not creative.

[0027] Figure 1 is a schematic diagram of the impeller disassembled by the axial flow pump impeller disassembly tool in the embodiment of the present application;

[0028] Figure 2 is a structural schematic diagram of the shaft sleeve in the embodiment of the present application;

[0029] Figure 3 is a structural schematic diagram of the rod in the first embodiment of the present application;

[0030] Figure 4 is a structural schematic diagram of the rod in the second embodiment of the present application.

[0031] The reference signs of the above accompanying drawings are as follows: 1, shaft sleeve; 11, third section; 12, fourth section; 13, second connecting section; 14, through hole; 2, rod; 21, limiting block; 22, first section; 23, second section; 24, first connecting section; 3, pump shaft; 41, support; 42, ejector rod; 43, hook claw. DETAILED DESCRIPTION

[0032] The technical schemes in the embodiments of the present application will be described clearly and completely in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0033] It should be noted that, in the description of the present application, the terms "first", "second", etc. are only used for description purpose and to distinguish similar objects, and there is no sequence between the two, and it cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0034] In combination with Figures 1-4 as shown.

[0035] Embodiment one: an axial flow pump impeller disassembly tool for disassembling a circular hub, comprising:

[0036] The shaft sleeve 1, as Figure 2As shown, the sleeve 1 is divided into a third section 11, a fourth section 12, and a second connecting section 13 connecting the third and fourth sections 11 and 12. The outer wall of the second connecting section 13 forms a 15° angle with the third section 11. The outer diameter of the fourth section 12 is larger than that of the third section 11 and equal to the outer diameter of the pump shaft 3. The sleeve is provided with a through hole 14 along its length.

[0037] Optionally, the outer diameter of the fourth section 12 may be smaller than the outer diameter of the pump shaft 3 , but when using the tool to disassemble the impeller, it is necessary to ensure that the upper edge of the fourth section 12 is flush with the upper edge of the pump shaft.

[0038] Optionally, the angle between the outer side wall of the second connecting section 13 and the third section 11 can also be set to 10° to 20°.

[0039] Optionally, the end of the pump shaft 3 has a first step protruding outward, and the end of the fourth section 13 of the sleeve 1 facing away from the third section 11 is concave to form a second step matching the first step.

[0040] The through hole of the sleeve 1 can be provided with a rod 2, Figure 1 、 3 As shown, a limit block 21 is provided at one end of the rod 2 close to the third section 11 of the sleeve 1. The limit block 21 is recessed into an interface at the end facing away from the rod 2, and the interface is semicircular. The outer diameter of the limit block 21 is larger than the outer diameter of the third section 11 of the sleeve 1. A threaded connection portion that matches the end of the pump shaft 3 is provided at one end of the rod 2 close to the fourth section 12 of the sleeve 1. It should be noted that, in this embodiment, the end of the pump shaft 3 has a concave threaded portion, and the threaded connection portion of the rod 2 can be connected to the concave threaded portion of the end of the pump shaft 3. The rod 2 is passed through the through hole of the sleeve 1, and the threaded connection portion of the rod 2 is tightened to the concave threaded portion of the end of the pump shaft 3, so that the sleeve 1 is close to the pump shaft 3. It should be noted that at this time, the third section 11 of the sleeve 1 extends outside the pump housing.

[0041] Optionally, the rod 2 may be an external hexagonal screw.

[0042] The tooling disclosed in this application also includes a puller assembly, which includes a support 41, a threaded hole is provided at the center of the support 41, and two hooks 43 are also provided on the support 41, and the two hooks 43 are symmetrically arranged about the threaded hole. A push rod 42 is passed through the threaded hole, and the surface of the push rod 42 is provided with threads, that is, the push rod 42 is threadedly connected to the support 41. After passing through the threaded hole of the support 41, the push rod 42 can be inserted into the interface of the limit block 21. It should be noted that the push rod 42 and the hooks 43 extend in the same direction.

[0043] Optionally, the support 41 can be disc-shaped, and two or more claws 43 can be arranged on the disc-shaped support 41, and the claws 43 can be uniformly distributed around the threaded hole of the support 41.

[0044] The steps of disassembling the hub using the above axial flow pump impeller disassembling tool are as follows:

[0045] The rod member 2 is inserted through the through hole of the shaft sleeve 1, and the threaded connection part of the rod member 2 is screwed with the internally recessed threaded part at the end of the pump shaft 3, so that the shaft sleeve 1 is tightly attached to the pump shaft 3.

[0046] The two claws 43 of the puller assembly are clamped on the inner side of the circular hub, and the end of the ejector rod 42 is inserted into the interface of the limiting block 21;

[0047] Since the ejector rod 42 and the support 41 are in threaded connection, rotating the ejector rod 42 can drive the support 41 to move along the ejector rod 42, thereby driving the hub to be separated from the pump shaft 3. During the process, the end of the ejector rod 42 is inserted into the semicircular interface, avoiding misalignment of the ejector rod 42 and the rod member 2 during rotation.

[0048] During the process, the hub is first pulled from the pump shaft 3 to the fourth section 12 of the shaft sleeve 1. Since the outer diameter of the fourth section 12 is equal to the outer diameter of the pump shaft 3, the process can be smoothly transitioned.

[0049] The hub located on the fourth section 12 of the shaft sleeve 1 is continuously pulled, and after passing through the 15° second connecting section 13, it is smoothly moved to the third section 11. Compared with the stepped structure, when the hub slides from the fourth section 12 to the third section 11, there will be a significant drop, causing the hub to collide with the third section 11, which may damage the hub. The 15° inclined second connecting section 12 acts as a buffer slope, allowing the hub to smoothly move along the slope to the third section 11, avoiding collision.

[0050] The puller assembly continuously pulls the hub along the third section 11 of the shaft sleeve 1 to the outside of the pump shell, and the hub is hoisted to a predetermined area by a sling.

[0051] It should be noted that during the sliding process of the hub on the shaft sleeve 1, the friction between the hub and the shaft sleeve 1 will wear the surface of the shaft sleeve 1, causing the surface of the shaft sleeve 1 to become barbed. The barbs will affect the sliding of the hub, thereby affecting the disassembly of the hub. Therefore, multiple shaft sleeves 1 can be prepared, and the worn shaft sleeve 1 can be replaced in time.

[0052] Optionally, multiple shaft sleeves 1 with different outer diameters can be prepared to adapt to pump shafts 3 with different outer diameters.

[0053] Embodiment two: an axial flow pump impeller disassembling tool for disassembling a circular hub, comprising:

[0054] The rod member 2, such as Figure 4As shown, the rod 2 is divided into a first section 22, a second section 23 and a first connecting section 24 connecting the first section 22 and the second section 23, and an angle between the outer side wall of the first connecting section 24 and the first section 22 is 15°. The outer diameter of the second section 23 is greater than the outer diameter of the first section 22, and the outer diameter of the second section 23 is less than or equal to the outer diameter of the pump shaft 3.

[0055] The first section 22 of the rod 2 is recessed at one end away from the second section 23 to form an interface, and the interface is semicircular.

[0056] The second section 23 of the rod 2 is provided with a threaded connection part at one end away from the first section 22 to cooperate with the end of the pump shaft 3. It should be noted that the end of the pump shaft 3 has a recessed threaded part, and the threaded connection part of the rod 2 can be connected with the recessed threaded part of the end of the pump shaft 3.

[0057] The puller assembly further comprises a support 41 provided with a threaded hole at the center, and the support 41 is further provided with two claws 43 symmetrically arranged about the threaded hole. A jack 42 is arranged in the threaded hole, and the surface of the jack 42 is provided with threads, that is, the jack 42 is threadedly connected with the support 41. The jack 42 can be inserted into the interface after penetrating through the threaded hole of the support 41. It should be noted that the jack 42 and the claws 43 extend in the same direction.

[0058] Compared with example one, example two saves the time cost and material cost of manufacturing the shaft sleeve 1.

[0059] The principle and implementation mode of the present application are described in the specific embodiments, and the above embodiment is only used to help understand the method and core idea of the present application. Meanwhile, for the general skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A tool for disassembling and assembling an axial flow pump impeller, characterized in that: include: a rod member, the rod member being divided into a first section and a second section, the outer diameter of the second section being larger than the outer diameter of the first section, the outer diameter of the second section being smaller than or equal to the outer diameter of the pump shaft, and an end of the second section of the pump shaft facing away from the first section being provided with a connecting portion that mates with an end of the pump shaft; A puller assembly, the puller assembly comprising at least two hooks; When using this tool to disassemble the impeller, the end of the second section of the rod facing away from the first section abuts against the end of the pump shaft, and the upper edge of the second section of the rod is flush with the upper edge of the pump shaft, and the top rod of the puller assembly abuts against the end of the first section of the rod facing away from the second section.

2. The axial flow pump impeller disassembly and assembly tool according to claim 1, characterized in that: A first connecting section is provided between the first section and the second section, and an angle of 10° to 20° is formed between an outer wall surface of the first connecting section and the first section.

3. The axial flow pump impeller disassembly and assembly tool according to claim 2, characterized in that: An angle of 15° is formed between the outer wall surface of the first connecting section and the first section.

4. The axial flow pump impeller disassembly and assembly tool according to claim 1 or 2, characterized in that: One end of the first section of the rod facing away from the second section is concave to form an interface, and the top rod of the puller assembly can be inserted into the interface.

5. The axial flow pump impeller disassembly and assembly tool according to claim 4, characterized in that: When the second section of the rod is connected to the end of the pump shaft, the first section of the rod extends outside the pump housing.

6. The axial flow pump impeller disassembly and assembly tool according to claim 1, characterized in that: It also includes a shaft sleeve, which is detachably connected to the rod member. The shaft sleeve is divided into a third section and a fourth section. The fourth section is sleeved outside the second section of the rod member, and the third section is sleeved outside the first section of the rod member. The outer diameter of the fourth section is larger than the outer diameter of the third section, and the outer diameter of the fourth section is less than or equal to the outer diameter of the pump shaft.

7. The axial flow pump impeller disassembly and assembly tool according to claim 6, characterized in that: A second connecting section is provided between the third section and the fourth section of the shaft sleeve, and an angle of 15° is formed between the second connecting section and the third section.

8. The axial flow pump impeller disassembly and assembly tool according to claim 6 or 7, characterized in that: A limiting block is provided at one end of the first section of the rod member which is away from the second section, and the outer diameter of the limiting block is greater than the inner diameter of the first section of the sleeve.

9. The axial flow pump impeller disassembly and assembly tool according to claim 8, characterized in that: The shaft sleeve is in clearance fit with the rod, and the rod can rotate relative to the shaft sleeve.

10. The axial flow pump impeller disassembly and assembly tool according to claim 1, characterized in that: The puller assembly includes: A support, wherein the support is provided with a threaded hole; A push rod, wherein the surface of the push rod is provided with a thread, the push rod passes through the threaded hole of the support and is threadedly connected to the support; At least two hooks are provided on the support, and the hooks are distributed on both sides of the push rod.

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