CN111502962A - Stress relief structure and design method for integrated design of multi-stage compressor unit - Google Patents

Abstract

The invention discloses a stress relief structure and a design method for multi-stage compressor unit integrated design, and relates to the technical field of multi-stage compressor unit integrated design; the spring combination structure comprises a plurality of spring hangers arranged on a support lug of the interstage equipment, a first lifting lug is arranged on the spring mounting support, a second lifting lug is arranged on the support lug of the interstage equipment, so that the interstage equipment is arranged at a position close to the position just below a corresponding compressor pipe orifice, and the interstage equipment is lifted by the spring hangers; by implementing the technical scheme, the technical problem that the pipeline centralized arrangement difficulty of the existing integrated design equipment is high can be solved; the displacement deformation of each pipeline is absorbed and coordinated by adopting a spring combined structure, so that the stress and the load of the pipeline do not exceed allowable values, the aim of reducing the length of the pipeline and the number of elbows to the maximum extent is fulfilled, the optimized integrated design of a compressor unit is realized, the normal operation of the compressor is ensured, and the working efficiency of the compressor is greatly improved.

Description

Stress relief structure and design method for integrated design of multi-stage compressor unit

technical field

The invention relates to the technical field of integrated design of multi-stage compressor units, and more particularly, to a stress relief structure and a design method for integrated design of multi-stage compressor units.

Background technique

In the field of petrochemical technology, compressors are usually the largest energy consumers, and multi-stage compressors are the most common form of large-scale compressors. Multi-stage compressor units are widely used in petrochemical plants. The medium reaches the required pressure. The multi-stage compressor unit has many interstage equipment and pipelines, and the traditional multi-stage compressor unit equipment pipeline layout is complicated. The unit equipment adopts rigid support, and one end of the pipeline is connected with the compressor nozzle, and the other end is connected with the unit equipment In this way, both ends of each pipeline of the unit are completely fixed, which requires the pipeline to have sufficient length and a large number of elbows in all directions to meet the stress requirements of the pipeline and the force requirements of the nozzle of the equipment, thereby making the unit The equipment is arranged far away from the compressor, which results in a large space for the unit layout, and a large amount of materials such as pipes and elbows. At the same time, the energy consumption of the compressor will also increase, and the efficiency of the compressor unit is extremely low.

In view of the above technical problems, the integrated design of the inter-stage equipment, pipelines and other units of the multi-stage compressor unit is carried out to minimize the length of the pipeline and the number of elbows, and the unit is arranged in the smallest space range, thereby improving the efficiency of the compressor. It becomes a technical problem that those skilled in the art need to solve urgently.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problem that the centralized arrangement of pipelines of the existing integrated design equipment is difficult, the purpose of the present invention is to provide a stress relief structure and a design method for the integrated design of a multi-stage compressor unit, the purpose of which is to use the spring combination structure to absorb and Coordinate the displacement and deformation of each pipeline, which can not only effectively bear the weight of interstage equipment and pipelines, but also form a whole between the interstage equipment and pipelines, and use natural compensation methods to solve the pipeline stress, so that the pipeline stress and load do not exceed the allowable values. , in order to achieve the purpose of minimizing the length of the pipeline and the number of elbows, realize the optimal integrated design of the compressor unit, ensure the normal operation of the compressor, and effectively and greatly improve the working efficiency of the compressor.

The technical scheme adopted in the present invention is as follows:

The stress relief structure of the integrated design of the multi-stage compressor unit includes a spring combination structure and a spring mounting bracket for installing the spring combination structure, and the spring combination structure includes a plurality of spring hangers arranged on the lugs of the inter-stage equipment. The spring mounting bracket is provided with a first lifting lug, and the interstage equipment supporting lug is provided with a second lifting lug. One end of the spring hanger is hinged with the first lifting lug, and the other end of the spring The lifting lugs are hinged, so that the interstage equipment is arranged in a position close to the immediate lower part of the nozzle of the corresponding compressor, and the spring hanger is used to support and suspend the interstage equipment.

According to the analysis of the inventor of the present application, the integrated design of the multi-stage compressor unit is to arrange the equipment pipelines in a centralized manner. Since the interstage equipment adopts rigid support, the pipeline direction is simple and has no natural compensation ability, which will cause excessive pipeline stress and pipeline to compressor. The thrust of the nozzle, the key to the integrated design of the compressor unit is to control the pipeline stress and the force of the equipment nozzle, and the difficulty of the integrated design of the multi-stage compressor is that it is difficult to reduce the pipeline stress and the compressor nozzle load, which is very difficult. It is easy to exceed the allowable value and cause the compressor to fail to operate; according to this analysis, this technical solution uses a spring combination structure to replace the rigid support of the equipment between the stages, so as to form a space between the equipment and the pipeline. The overall and natural compensation method is adopted to solve the pipeline stress. The thermal expansion and deformation of each pipeline are absorbed and coordinated by the spring combination structure, so that the pipeline stress and nozzle load do not exceed the allowable value, thereby achieving the design of minimizing the length of the pipeline and the number of elbows. The purpose is to rationally arrange the compressors and equipment between all levels, and use simple pipes to connect the inlet and outlet of the compressor and the nozzles of the intermediate equipment at all levels, so as to realize the optimal integrated design of the compressor unit, ensure the normal operation of the compressor, and maximize the efficiency of the compressor. To improve the working efficiency of the compressor, the design structure is simple but ingenious and reasonable, which can effectively solve the key difficulties in the integrated design of the multi-stage compressor unit, and at the same time achieve a significant and effective engineering practice effect.

Optionally, the first lifting lug is welded on the spring mounting bracket, and the second lug is welded on the interstage equipment support lug, and the support lug extends horizontally outward along the diameter direction of the interstage equipment side wall. , a pair of support lugs are arranged oppositely at both ends of the interstage equipment. Therefore, the spring hanger can bear the weight of interstage equipment and pipelines without restricting their downward displacement, and the articulation between the two ends of the spring hanger and the first lifting lug and the second lifting lug does not limit the interstage The equipment is displaced along its axial direction, so that the interstage equipment and the connecting pipeline are considered together as a whole, and the natural compensation method is used to solve the pipeline stress problem.

Optionally, there is a lifting lug hole at the lower end of the first lifting lug, so that the upper end of the spring hanger is hinged on the first lifting lug through the bolt bearing pin through the corresponding lifting lug hole; the upper end of the second lifting lug has a lifting lug hole , so that the lower end of the spring hanger is hinged on the second lifting lug through the bolt bearing pin through the corresponding lifting lug hole. The use of bolt load-bearing pins makes the spring hanger form a hinge structure with the first lifting lug and the second lifting lug at both ends. The ingenious design of the existing structure will not cost additional material design costs, and the spring combination structure can be effectively used to absorb and coordinate The displacement and deformation of each pipeline has good practicability.

As a preferred solution of the spring hanger, the spring hanger includes a spring body and a hanger rod connected to the lower end of the spring body, the upper end of the spring body is hinged with the first lifting lug, and the lower end of the hanger rod is connected to the second hanger. Lifting lugs are hinged.

Optionally, the first lifting lug is a single-board lifting lug, and the second lifting lug is a double-plate lifting lug.

As another preferred solution of the spring hanger, the spring hanger includes a spring body and a hanger rod connected to the upper end of the spring body, the lower end of the spring body is hinged with the second lifting lug, and the upper end of the hanger rod is connected to the first hanger. A lifting lug is hinged.

Optionally, the first lifting lug is a double-plate suspension lug, and the second suspension lug is a single-plate suspension lug.

Optionally, the bolt bearing pins are installed horizontally along the radial plane of the interstage equipment. In this way, in a limited installation space, the interstage equipment can be moved along its axial direction without restricting its vertical displacement, which saves the arrangement space of the unit and facilitates the realization of the optimal integrated design of the compressor unit.

On the other hand, the present invention also provides a stress relief design method for the integrated design of a multi-stage compressor unit, applying the stress relief structure described in any one of claims 1-8, and the stress relief design method comprises the following steps:

S1, determine the position of the compressor, including its plane position and installation height;

S2, determine the position of the inter-stage equipment, so that the inter-stage equipment is arranged in the vicinity of the position near the nozzle of the corresponding compressor;

S3, determine the direction of the connecting pipeline according to the nozzle of the interstage equipment and the nozzle of the corresponding compressor, and the direction of the pipeline is as simple as possible;

S4, use the spring combination structure to hang the lugs at both ends of the interstage equipment on the spring mounting bracket, and arrange to determine the position and basic form of the spring combination structure;

S5, carry out the overall stress analysis of each interstage equipment and the corresponding pipeline connected to the compressor nozzle. The analysis uses the compressor nozzle as the fixed end of the pipeline. The overall stress analysis includes the analysis and calculation of the pipeline stress, the compressor nozzle force and Spring data in the spring composite structure;

S6, modify and adjust the position of the compressor, the position of the interstage equipment or the installation position of the upper part of the spring combination structure according to the overall stress analysis result in step S5, so that the pipeline stress and the force of the compressor nozzle meet the allowable values.

Preferably, the spring combination structure includes at least two spring hangers correspondingly arranged on the lugs close to both ends of the interstage equipment; in step S6, modifying and adjusting the position of the interstage equipment adopts the modification and adjustment of the lug position of the interstage equipment .

As mentioned above, the present invention has at least the following beneficial effects compared to the prior art:

1. The stress relief structure of the present invention adopts the spring combination structure to replace the rigid support of the equipment between all levels, so that the thermal expansion deformation of each pipeline is absorbed and coordinated by the spring combination structure, so that the pipeline stress and the nozzle load do not exceed the allowable value, so that the To achieve the design goal of minimizing the length of the pipeline and the number of elbows, the compressors and equipment between stages can be reasonably arranged, and the inlet and outlet of the compressor and the nozzles of the intermediate equipment at all levels can be connected with simple pipelines to achieve the optimal compressor unit. Integrated design.

2. The spring combination structure of the present invention can not only effectively bear the weight of interstage equipment and pipelines, but also does not limit its downward displacement, and the hinge between the two ends of the spring hanger and the first lifting lug and the second lifting lug does not. Limit the displacement of the interstage equipment along its axial direction, so that the interstage equipment and the connecting pipeline are considered together as a whole, and the natural compensation method is used to solve the problem of pipeline stress, and then solve the technical problems of pipeline stress and compressor nozzle load; simple and easy It can be realized and can save a lot of engineering costs.

3. The spring combination structure provided by the present invention fully considers the coordination of the temperature difference deformation of the pipeline and the load of the compressor nozzle; after the overall stress analysis of the interstage equipment and the pipeline, the data of the springs (including installation load, spring stiffness, displacement), so that the nozzle of the compressor meets the force requirements, so that the spring combination structure is suitable for this application scenario and has achieved significant and effective engineering practice results.

4. The stress-relieving structure design method of the present invention breaks the conventional method of increasing the length of the pipeline to reduce the stress of the pipeline to solve the technical problem that the integrated design makes the centralized arrangement of the equipment pipeline difficult, but fully considers the arrangement of the unit in the smallest. Within the scope of space, a simple and effective natural compensation method is used to control the stress of the pipeline and the force of the nozzle of the equipment, so as to ensure the simple direction of the pipeline and realize the optimal integrated design of the compressor unit, ensure the normal operation of the compressor, and maximize the To improve the working efficiency of the compressor, the design structure is simple but ingenious and reasonable, and it can save a lot of investment, bring significant economic benefits to the enterprise, and has a good application prospect and promotion and use value.

Description of drawings

The invention will be described by way of specific embodiments with reference to the accompanying drawings, wherein

1 is a schematic diagram of the arrangement of the stress relief structure of the integrated design of the multi-stage compressor unit according to an exemplary embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the stress relief structure in FIG. 1 according to an exemplary embodiment of the present invention.

Description of reference numerals: 1-compressor nozzle one; 2-compressor nozzle two; 3-pipeline one; 4-pipeline two; 5-spring hanger one; 6-spring hanger two; 7-spring hanger 3; 8-spring hanger four; 9-interstage equipment (cooler); 10-spring body; 11-suspender; 12-first lifting lug; 13-second lifting lug; 14-bolt bearing pin 1; 15-bolt bearing pin two; 16-support lug; 17-spring mounting bracket.

Detailed ways

All features disclosed in this specification, or all disclosed steps in a method or process, may be combined in any way except mutually exclusive features and/or steps.

Any feature disclosed in this specification (including any accompanying claims, abstract), unless expressly stated otherwise, may be replaced by other equivalent or alternative features serving a similar purpose. That is, unless expressly stated otherwise, each feature is but one example of a series of equivalent or similar features.

The embodiment is basically shown in Figures 1 to 2: this embodiment provides a stress relief structure with an integrated design of a multi-stage compressor unit, which is applied to the inter-stage equipment (cooler) 9 and the pipeline of the multi-stage compressor unit. In the integrated design of the unit, it includes a spring combination structure and a spring mounting bracket 17 for installing the spring combination structure. Specifically, the spring combination structure includes a plurality of spring hangers arranged on the interstage equipment lugs 16. This implementation is implemented in A pair of support lugs 16 are oppositely provided at both ends of the equipment between the levels, and each support lug 16 is correspondingly provided with a spring hanger, thereby having four spring hangers, namely spring hanger 1, spring hanger 5 and spring hanger. 26. Spring hanger three 7 and spring hanger four 8; this embodiment uses the spring combination structure composed of spring hangers, which can not only bear the weight of interstage equipment and pipelines, but also does not limit their downward displacement; spring mounting brackets 17 is provided with a first lifting lug 12, on the interstage equipment support lug 16 is provided a second lifting lug 13, the upper end of the spring hanger is hinged with the first lifting lug 12, and the lower end of the spring hanger is connected with the second lifting lug 13 Hinged, so that the interstage equipment is arranged near the position directly below the corresponding compressor nozzle, and four spring hangers are used to support the interstage equipment.

In order to ensure the installation stability of the stress relief structure, in this embodiment, the first lifting lug 12 is welded on the spring mounting bracket 17, and the second lifting lug 13 is welded on the interstage equipment support lug 16, and the support lug 16 is connected by the interstage equipment side. The wall extends horizontally outward along its diameter direction, and the hinge between the two ends of the spring hanger and the first lifting lug 12 and the second lifting lug 13 does not limit the axial displacement of the interstage equipment, so that the interstage equipment and the The connecting pipelines are considered together as a whole, and the natural compensation method is used to solve the pipeline stress problem.

As shown in FIG. 2 , the spring hanger in this embodiment includes a spring body 10 and a suspension rod 11 connected to the lower end of the spring body 10 . The ears 13 are hinged, specifically, the first lifting lug 12 is a single-plate lifting lug, the second lifting lug 13 is a double-plate lifting lug, and there is a lifting lug hole at the lower end of the single-plate lifting lug, so that the spring body in the spring hanger The upper end of the 10 is hinged on the veneer lifting lug through the bolt bearing pin through the corresponding lifting lug hole, specifically, the bolt bearing pin 14 is hinged on the veneer lifting lug through the corresponding lifting lug hole; the upper end of the double plate lifting lug has a lifting lug hole, In order to make the lower end of the suspension rod 11 in the spring hanger hinged on the double-plate lifting lug through the bolt bearing pin through the corresponding lifting lug hole, specifically, the bolt bearing pin 2 15 is hinged on the double-plate lifting lug through the corresponding lifting lug hole, and the bolt The load-bearing pins are installed horizontally along the radial plane of the interstage equipment. In this embodiment, the bolt bearing pin is used to make the spring hanger and the first lifting lugs 12 and the second lifting lugs 13 at both ends form a hinge structure. The existing structure is cleverly designed without extra material design cost, and the spring can be effectively used. The combined structure to absorb and coordinate the displacement and deformation of each pipeline has good practicability.

From the above, in this embodiment, the spring combination structure can not only effectively bear the weight of the interstage equipment and the pipeline, but does not limit its downward displacement, and the two ends of the spring hanger are connected to the first lifting lug 12 and the second lifting lug 13. The articulation between the interstage equipment does not limit the axial displacement of the interstage equipment, so that the interstage equipment and the connecting pipeline are considered together as a whole, and the natural compensation method is used to solve the pipeline stress problem, and then solve the pipeline stress and compressor nozzle. The technical problem of the load; it is simple and easy to implement, and can save a lot of engineering costs; the stress relief structure design method in this embodiment breaks the conventional way of thinking of solving the technical problem that the integrated design makes the centralized arrangement of equipment pipelines difficult by improving the stress strength of the pipeline. Instead, we should fully consider arranging the unit in the smallest space, and use a simple and effective natural compensation method to control the stress of the pipeline and the force of the equipment nozzle, so as to ensure the simple direction of the pipeline and realize the optimal compressor unit. The integrated design ensures the normal operation of the compressor and maximizes the working efficiency of the compressor. The design structure is simple but ingenious and reasonable, which can save a lot of investment, bring significant economic benefits to the enterprise, and has a good application prospect and promotion value. .

Embodiment 2

The second embodiment is basically the same as the first embodiment, except that the spring body 10 and the suspension rod 11 of the spring hanger in the spring combination structure provided in this embodiment are designed differently (not shown) in the corresponding positions. The spring hanger includes: The spring body 10 and the suspension rod 11 connected to the upper end of the spring body 10, the lower end of the spring body 10 is hinged with the second lifting lug, and the upper end of the suspension rod 11 is hinged with the first lifting lug; correspondingly, the first lifting lug is a double-plate suspension The second lifting lug is a single-plate lifting lug with a lifting lug hole at the lower end of the double-plate lifting lug, so that the upper end of the suspension rod 11 in the spring hanger is hinged on the double-plate lifting lug through the corresponding lifting lug hole through the bolt load-bearing pin The upper end of the veneer lifting lug has a lug hole, so that the lower end of the spring body 10 in the spring hanger is hinged on the veneer lug through the bolt bearing pin through the corresponding lug hole, and the bolt bearing pin is along the radial direction of the interstage equipment. The plane is installed horizontally, so that the interstage equipment can be moved along its axial direction within a limited installation space, and its vertical displacement is not restricted, which saves the unit layout space and facilitates the realization of the optimal integrated design of the compressor unit. .

Embodiment 3

On the other hand, FIG. 1 shows a schematic diagram of the arrangement of the stress relief structure of the integrated design of the multi-stage compressor unit according to the exemplary embodiment of the present invention. According to the present invention, this embodiment also provides an integrated design of the multi-stage compressor unit. A stress relief design method, which applies the stress relief structure in the first embodiment, the stress relief design method includes the following steps:

S1, determine the position of the compressor, including its plane position and installation height;

S2, determine the position of the inter-stage equipment (cooler) 9, so that the inter-stage equipment is arranged in a position near the directly below the nozzle of the corresponding compressor;

S3, determine the direction of the connecting pipeline according to the nozzle of the interstage equipment and the nozzle of the corresponding compressor, and the direction of the pipeline is as simple as possible;

S4, use the spring combination structure to support the lugs 16 at both ends of the interstage equipment (cooler) 9 on the spring mounting bracket 17, and arrange to determine the position and basic form of the spring combination structure;

S5, perform an overall stress analysis on each interstage device and the corresponding pipeline 1 3 connected to the compressor nozzle 1 and the pipeline 2 4 connected to the compressor nozzle 2 2. The analysis is based on the compressor nozzle nozzle 1 and the compression The nozzle 2 of the compressor is used as the fixed end of the pipeline, and the overall stress analysis includes analyzing and calculating the pipeline stress, the force of the compressor nozzle and the spring data in the spring combination structure;

S6, modify and adjust the position of the compressor, the position of the interstage equipment or the installation position of the upper part of the spring combination structure according to the overall stress analysis result in step S5, so that the pipeline stress and the force of the compressor nozzle meet the allowable values.

In this embodiment, the spring combination structure includes two spring hangers correspondingly arranged on the lugs 16 near the two ends of the interstage equipment (cooler) 9; Usually, it is necessary to modify the design and perform pipeline stress analysis several times to meet the requirements; modifying the design includes adjusting the position of the intermediate equipment, modifying the pipeline direction, etc. As the preferred solution of this embodiment, the most effective and simplest method is to modify and adjust in step S6. The position of the interstage equipment is adjusted by modifying the position of the lugs of the interstage equipment.

It is worth noting that there must be two water inlet and outlet pipes connected to the underground water pipe between the equipment at each level. The diameter of these two pipes is not large, but it is necessary to pay attention to their influence on the interstage equipment. If neither affects the spring combination structure The normal function of the device, and at the same time, it can have a good stabilization effect on the inter-stage equipment in the horizontal direction.

The following is a comparison of the stress analysis results of the prior art with the overall stress analysis results applied to the integrated design of the multi-stage compressor unit for the stress relief structure of the present embodiment:

Comparative scheme 1: The stress relief structure in Example 1 is completely adopted, that is, spring hanger 1 5, spring hanger 2 6, spring hanger 3 7 and For spring hanger No. 8, the overall stress analysis results after installation are shown in Table 1, which fully meet the requirements of engineering specifications.

Table 1 The analysis results of the force and moment of the compressor nozzle with the stress relief structure of the first embodiment

Comparative scheme 2: Part of the stress relief structure in Example 1 is adopted, that is, a spring hanger 1 and a spring hanger 2 are arranged on one end lug of the interstage equipment shown in Figure 1, and the other end lug of the interstage equipment is provided. The spring hanger 3 and spring hanger 4 are not installed on the top. The overall stress analysis results after installation are shown in Table 2. The numerical values of the operating conditions in the table below are extremely large and do not meet the requirements of the engineering specification.

Table 2 Part of the analysis results of the force and moment of the compressor nozzle using the stress relief structure of Example 1

Comparative scheme 3: The stress relief structure in Example 1 is not used at all, that is, the lugs at both ends of the interstage equipment shown in Figure 1 are supported by rigid structures, and the overall stress analysis results after installation are shown in Table 3. The numerical values of the operating conditions in the table are extremely large and do not meet the requirements of the engineering specification.

Table 3 Analysis results of the force and moment of the compressor nozzle without the stress relief structure of Example 1

It can be seen from the comparison that the analysis technology results of the above three schemes show that the integrated design of energy saving and efficiency increase of the compressor unit can be realized by completely adopting the stress relief structure in the first embodiment, while the other two schemes cannot realize the energy saving and efficiency increase of the compressor unit. integrated design.

To sum up, the stress relief structure of this embodiment adopts the spring combination structure to replace the rigid support of the equipment between all levels, so that the thermal expansion deformation of each pipeline is absorbed and coordinated by the spring combination structure, so that the pipeline stress and the nozzle load do not exceed the allowable limit. In order to achieve the design purpose of minimizing the length of the pipeline and the number of elbows, the spring composite structure fully considers the coordination of the temperature difference deformation of the pipeline and the load of the compressor nozzle; after the overall stress analysis of the interstage equipment and pipeline, the calculation The data of each spring (including installation load, spring stiffness, and displacement) make the compressor nozzle meet the force requirements, so that the spring combination structure is suitable for this application scenario and achieves significant and effective engineering practice results; after the overall stress The analysis results show that the integrated design of the compressor unit can be well realized, the compressors and the equipment between all levels can be arranged reasonably, and the inlet and outlet of the compressor and the nozzles of the intermediate equipment at all levels can be connected with simple pipelines, which can reduce a lot of pipeline materials. And layout space, and greatly improve the efficiency of the compressor, has a good application prospect and promotion value, suitable for promotion and application.

The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims (10)

1. Stress relief structure of multistage compressor unit integrated design, its characterized in that: the spring mounting support is used for mounting the spring combination structure, the spring combination structure comprises a plurality of spring hangers arranged on an interstage equipment support lug, a first lifting lug is arranged on the spring mounting support, a second lifting lug is arranged on the interstage equipment support lug, one end of each spring hanger is hinged to the first lifting lug, the other end of each spring hanger is hinged to the second lifting lug, so that the interstage equipment is arranged at a position close to and near the position right below a corresponding compressor pipe orifice, and the spring hangers are used for supporting and lifting the interstage equipment.

2. The multi-stage compressor assembly designed stress relief structure of claim 1, wherein: the first lifting lug is welded on the spring mounting bracket, the second lifting lug is welded on a support lug of the interstage equipment, the support lug extends horizontally outwards from the side wall of the interstage equipment along the diameter direction of the interstage equipment, and a pair of support lugs are oppositely arranged at two ends of the interstage equipment.

3. The multi-stage compressor assembly designed stress relief structure of claim 1, wherein: the lower end of the first lifting lug is provided with a lifting lug hole, so that the upper end of the spring hanging bracket is hinged on the first lifting lug through a bolt bearing pin passing through the corresponding lifting lug hole; and the upper end of the second lifting lug is provided with a lifting lug hole, so that the lower end of the spring lifting bracket passes through the corresponding lifting lug hole through a bolt bearing pin and is hinged on the second lifting lug.

4. The multi-stage compressor assembly designed stress relief structure of claim 3, wherein: the spring hanger comprises a spring body and a hanging rod connected to the lower end of the spring body, the upper end of the spring body is hinged to the first lifting lug, and the lower end of the hanging rod is hinged to the second lifting lug.

5. The multi-stage compressor assembly designed stress relief structure of claim 4, wherein: the first lifting lug is a single-plate lifting lug, and the second lifting lug is a double-plate lifting lug.

6. The multi-stage compressor assembly designed stress relief structure of claim 3, wherein: the spring hanger comprises a spring body and a hanging rod connected to the upper end of the spring body, the lower end of the spring body is hinged to the second lifting lug, and the upper end of the hanging rod is hinged to the first lifting lug.

7. The multi-stage compressor assembly designed stress relief structure of claim 6, wherein: the first lifting lug is a double-plate lifting lug, and the second lifting lug is a single-plate lifting lug.

8. The multi-stage compressor assembly designed stress relief structure of claim 3, wherein: the bolt bearing pin is horizontally arranged and installed along the radial plane of the interstage equipment.

9. The stress relief design method for the integrated design of the multistage compressor unit is characterized by comprising the following steps of: applying the stress relief structure of any of claims 1 to 8, said stress relief design method comprising the steps of:

s1, determining the position of the compressor, including the plane position and the installation height of the compressor;

s2, determining the position of the interstage equipment, so that the interstage equipment is arranged at a position close to and near the position right below the corresponding compressor nozzle;

s3, determining the direction of the connecting pipeline according to the interstage equipment pipe orifice and the corresponding compressor pipe orifice;

s4, using a spring combination structure to suspend the support lugs at two ends of the interstage equipment on a spring mounting bracket;

s5, performing overall stress analysis on each interstage device and the pipeline correspondingly connected with the pipe orifice of the compressor, wherein the pipe orifice of the compressor is used as a fixed end of the pipeline, and the overall stress analysis comprises analyzing and calculating the pipeline stress, the stress of the pipe orifice of the compressor and the spring data in the spring combined structure;

and S6, modifying and adjusting the position of the compressor, the position of the interstage equipment or the mounting position of the upper part of the spring combination structure according to the overall stress analysis result in the step S5, so that the pipeline stress and the stress of the nozzle of the compressor meet allowable values.

10. The method for designing stress relief for an integrated design of a multistage compressor assembly according to claim 9, wherein: the spring combination structure comprises at least two spring hangers which are respectively and correspondingly arranged on support lugs close to two ends of the interstage equipment; modifying the position of the adjusting interstage device in step S6 adopts modifying the position of the lug of the adjusting interstage device.

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