CN115450931A - Novel multi-stage centrifugal pump rotor calibration device and method - Google Patents

Abstract

The invention provides a novel multistage centrifugal pump rotor calibration device and method, which includes a housing support frame and a dynamic balancing machine, the housing support frame is fixedly installed on the base of the dynamic balancing machine; the multistage centrifugal pump core The package includes a core package lower shell, a shell mouth ring and a rotor assembly. The core pack lower shell is installed on the shell support frame, and the shell mouth ring is fixedly installed in the core pack lower shell. The rotor assembly is installed in the mouth ring of the housing, the shaft of the rotor assembly is connected to the dynamic balancing machine, the shaft is provided with multi-stage impellers, the impellers are equipped with an impeller mouth ring, and each stage The impellers are installed in the corresponding casing mouth rings, and the gap between the impeller mouth rings on each stage of the impeller and the corresponding casing mouth rings is 0.20-0.25mm. The technical scheme of the invention solves the problem that the conventional dynamic balance calibration method will cause damage to the rotor parts during disassembly and assembly, affect the service life of the multistage centrifugal pump, and the problem of low dynamic balance calibration accuracy.

Description

A novel multistage centrifugal pump rotor calibration device and method

technical field

The invention relates to the technical field of centrifugal pump rotor calibration, in particular to a novel multistage centrifugal pump rotor calibration device and method.

Background technique

The feed pumps of the refinery hydrogenation unit are all high-temperature, high-pressure multi-stage BB5 centrifugal pumps, which are also the core key pumps in the process of the unit, and play a vital role in the long-term operation of the unit. With the long operation period of the pump, the wearing efficiency of wearing parts decreases, and maintenance is required. The key step of maintenance is the dynamic balance calibration of the rotor. Since the core shell shell is an integral structure, it is respectively sleeved on each stage of the impeller of the rotor. The dynamic balance check needs to disassemble each stage impeller and take out the casing ring, and then reinstall each stage impeller to complete the rotor dynamic balance check. The following problems will exist in the disassembly process of the rotor parts:

(1) Due to the interference fit between the impeller and the shaft, it is necessary to use a baking handle to heat the impeller evenly to 320°C when disassembling the impeller. After the expansion difference between the impeller and the shaft occurs, the impeller is disassembled, because a small amount of plastic deformation will occur during the repeated heating process of the impeller , the grain size of the impeller material gradually becomes thicker, resulting in a decrease in the strength of the impeller, which will reduce the service life of the impeller;

(2) After checking that the dynamic balance of the rotor is qualified, it is necessary to disassemble the impeller again and reassemble the casing mouth ring with the impeller. At this time, it is impossible to verify whether the dynamic balance accuracy is affected during the assembly process after the impeller is reassembled;

The conventional dynamic balance calibration method will cause damage to the rotor parts during disassembly and assembly, which will affect the service life of the multistage centrifugal pump, and the dynamic balance calibration accuracy is low, the maintenance cycle is long, and the equipment integrity rate is reduced, which seriously affects the safety and stability of the device. run.

Contents of the invention

According to the technical problems of conventional multistage centrifugal pump rotor dynamic balance verification methods proposed above, a novel multistage centrifugal pump rotor verification device and method is provided.

The technical means adopted in the present invention are as follows:

A new type of multistage centrifugal pump rotor calibration device, including a housing support frame and a dynamic balancing machine, the housing support frame is fixedly installed on the base of the dynamic balancing machine; the multistage centrifugal pump core package includes a core package under the Housing, housing mouth ring and rotor assembly, the lower housing of the core pack is installed on the housing support frame, the housing mouth ring is fixedly installed in the lower housing of the core pack, and the rotor assembly is installed on the In the mouth ring of the housing, the shaft of the rotor assembly is connected to the dynamic balancing machine, the shaft is provided with multi-stage impellers, the impellers are equipped with an impeller mouth ring, and the impellers of each stage are installed In the corresponding casing mouth ring, the gap between the impeller mouth ring on each stage of the impeller and the corresponding casing mouth ring is 0.20-0.25 mm.

Further, the housing support frame includes a support platform and an arc-shaped support frame fixedly installed on the support platform, and the arc-shaped support frame includes arc-shaped support plates at both ends and a support plate for connecting the arc-shaped support plates. The connecting plate, the lower casing of the core package is installed on the arc support frame.

A novel multistage centrifugal pump rotor verification method, using the novel multistage centrifugal pump rotor verification device, specifically includes the following steps:

S1. Install the housing support frame on the base of the dynamic balancing machine through bolts;

S2. Take off the upper shell of the core pack of the multi-stage centrifugal pump core pack, place the lower shell of the core pack on the shell support frame, and adjust the lower shell of the core pack to the required position through the top wire installed on the shell support frame. height and level;

S3. Connect the shaft in the rotor assembly of the multi-stage centrifugal pump core package to the dynamic balancing machine, fix the housing mouth ring with the rotor assembly installed on the lower shell of the core package, and adjust the rotor assembly and the housing mouth ring to keep the same Shaft, and adjust the gap between the impeller ring on each impeller and the corresponding housing ring to 0.20-0.25mm;

S4. Perform a dynamic balance test on the rotor assembly with a dynamic balance machine, and complete the calibration according to the test results.

Compared with the prior art, the present invention has the following advantages:

The novel multi-stage centrifugal pump rotor calibration device and method provided by the present invention can improve the calibration accuracy of the rotor, reduce the number of disassembly and assembly of the rotor impeller, prolong the service life of the equipment, shorten the maintenance time, improve the integrity rate of the equipment, and ensure the safe and stable operation of the device; At the same time, since disassembly and assembly of the rotor impeller requires a very high technical level of maintenance personnel, the core package will need to be returned to the factory for maintenance during routine maintenance, and the maintenance cost is relatively high. Not high, the calibration result is more accurate, and the maintenance cost can be reduced.

Based on the above reasons, the present invention can be widely promoted in the field of multistage centrifugal pumps.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Figure 1 is a schematic diagram of the core pack structure of a multistage centrifugal pump.

Fig. 2 is a structural schematic diagram of the housing support frame of the present invention.

In the figure: 1, multi-stage centrifugal pump; 2, core-wrapped lower shell; 3, shell mouth ring; 4, rotor assembly; 41, impeller; 42, shaft; 5, shell support frame; 51, support platform; 52, arc support frame; 521, arc support plate; 522, connecting plate.

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. At the same time, it should be clear that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present invention, it should be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. indicate the orientation Or positional relationship is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. In the absence of a contrary description, these orientation words do not indicate or imply the device or element referred to. It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the scope of the present invention: the orientation words "inside and outside" refer to inside and outside relative to the outline of each part itself.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. its underlying device or construction". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. To limit the protection scope of the present invention.

Example 1

As shown in Fig. 1-2, the present invention provides a novel multi-stage centrifugal pump rotor calibration device, which includes a housing support frame 5 and a dynamic balancing machine, and the housing support frame 5 is fixedly installed on the dynamic balancing machine The base of the multistage centrifugal pump 1 core package includes the core package lower shell 2, the shell mouth ring 3 and the rotor assembly 4, the core package lower shell 2 is installed on the shell support frame 5, the shell The body mouth ring 3 is fixedly installed in the lower housing 2 of the core package, the rotor assembly 4 is installed in the housing mouth ring 3, and the shaft 42 of the rotor assembly 4 is connected to the dynamic balancing machine, so The shaft 42 is provided with a multi-stage impeller 41, the impeller 41 is equipped with an impeller mouth ring, and each stage of the impeller 41 is installed in the corresponding housing mouth ring 3, and each stage of the impeller 41 The gap between the impeller mouth ring and the corresponding housing mouth ring 3 is 0.20-0.25mm, so as to ensure that when the dynamic balance test is carried out, the rotor assembly will not be rubbed when rotating on the dynamic balancing machine, preventing The secondary damage of the impeller improves the accuracy of the dynamic balance inspection.

Further, the housing support frame 5 includes a support platform 51 and an arc-shaped support frame 52 fixedly installed on the support platform. The arc-shaped support frame 52 includes arc-shaped support plates 521 at both ends and for connecting the The connecting plate 522 of the arc-shaped support plate 521 , the lower shell of the core pack is installed on the arc-shaped support frame 52 .

A novel multistage centrifugal pump rotor verification method, using the novel multistage centrifugal pump rotor verification device, specifically includes the following steps:

S1. Install the housing support frame 5 on the base of the dynamic balancing machine through bolts;

S2. Remove the core package upper shell of the multistage centrifugal pump core package, place the core package lower shell 2 on the shell support frame 5, and adjust the core package lower shell through the top wire installed on the shell support frame 5 2 to the required height and keep it level;

S3. Connect the shaft 42 in the rotor assembly 4 of the core package of the multistage centrifugal pump to the dynamic balancing machine, fix the housing mouth ring 3 with the rotor assembly 4 installed on the lower housing 2 of the core package, and use a dial indicator and The feeler gauge adjusts the rotor assembly to be coaxial with the casing mouth ring 3, and adjusts the gap between the impeller mouth ring on each stage impeller 41 and the corresponding casing mouth ring 3 to be 0.20-0.25mm;

S4. Perform a dynamic balancing test on the rotor assembly 4 by a dynamic balancing machine, and complete the calibration according to the test results;

Specifically, step S4 specifically includes, when a dynamic balance machine is used for dynamic balance verification, two dynamic balance tests are performed, and the test results are compared, and when the test results on both sides meet the preset threshold, the last test result is output, and the process is completed. check.

Adopting the novel multi-stage centrifugal pump rotor verification device and method provided by the present invention, it is not necessary to repeatedly disassemble and assemble the casing ring on the impeller, the rotor assembly is moved as a whole, and the gap between the impeller ring and the casing ring is adjusted to ensure that the impeller After no friction occurs, the precise calibration of the rotor dynamic balance can be completed. The operation is simple, accurate, safe and reliable during the execution process. Compared with the conventional multi-stage rotor inspection method, it can save no less than 20 hours of work time and effectively improve the maintenance. efficiency.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (3)

1. The novel multi-stage centrifugal pump rotor calibration device is characterized by comprising a shell support frame and a dynamic balancing machine, wherein the shell support frame is fixedly arranged on a machine base of the dynamic balancing machine; the multistage centrifugal pump core package includes casing, casing choma and rotor subassembly under the core package, the casing install in under the core package casing support frame, casing choma fixed mounting in the core package is internal, the rotor subassembly install in the casing choma, the hub connection of rotor subassembly extremely the dynamic balancing machine, epaxial multistage impeller that is provided with, impeller mounting has the impeller choma, and each grade the impeller is all installed in correspondingly in the casing choma, each grade on the impeller choma is with corresponding clearance between the casing choma is 0.20-0.25mm.

2. The novel multistage centrifugal pump rotor calibration device of claim 1, wherein the casing support frame comprises a support platform and an arc-shaped support frame fixedly mounted on the support platform, the arc-shaped support frame comprises arc-shaped support plates at two ends and a connecting plate for connecting the arc-shaped support plates, and the core casing is mounted on the arc-shaped support frame.

3. A novel multi-stage centrifugal pump rotor calibration method is characterized in that the novel multi-stage centrifugal pump rotor calibration device of claim 1 is adopted, and the method specifically comprises the following steps:

s1, fixedly mounting a shell support frame on a base of a dynamic balancing machine through bolts;

s2, taking down the core cladding upper shell of the core cladding of the multistage centrifugal pump, placing the core cladding lower shell on a shell support frame, and adjusting the core cladding lower shell to a required height and keeping the core cladding lower shell horizontal through jackscrews arranged on the shell support frame;

s3, connecting a shaft in a rotor assembly of a multistage centrifugal pump core package to a dynamic balancing machine, fixedly installing a shell opening ring provided with the rotor assembly on a lower shell of the core package, adjusting the rotor assembly to be coaxial with the shell opening ring, and adjusting the gap between an impeller opening ring on each stage of impeller and the corresponding shell opening ring to be 0.20-0.25mm;

and S4, performing dynamic balance test on the rotor assembly through a dynamic balancing machine, and finishing verification according to a test result.

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