Double-shell horizontal multi-stage centrifugal pump with built-in balance pipe structure

Abstract

The utility model relates to a double-shell horizontal multi-stage centrifugal pump with a built-in balance pipe structure, which is characterized in that a shaft penetrates through a guide vane, a last-stage guide vane, a first-stage middle section, a middle section and a last-stage middle section, is provided with a first-stage impeller, a tap middle section, a second-stage impeller and a balance disc, and is arranged in a barrel part; a driving end bearing component is arranged outside the cylinder body component; a pump cover provided with a balance sleeve and a balance sleeve gland is arranged on the discharge side of the barrel part through a stud and a nut; a sealing box body is arranged on the other side of the outer part of the barrel body part; a sealing part and a non-driving end bearing part are sequentially arranged at the rear part of the sealing box body; according to the technical scheme, the problems that in the prior art, an existing double-shell horizontal multi-stage centrifugal pump needs to be externally connected with a circulation pipeline, so that the pipeline is complex, the number of leakage points is large, and the risk coefficient is large are solved.

Description

Technical Field

[0001] The double - casing horizontal multi - stage centrifugal pump with an internal balance pipe structure of the present utility model relates to the technical field of multi - stage centrifugal pumps, and particularly to a double - casing horizontal multi - stage centrifugal pump with an internal balance pipe structure applicable to working conditions such as high temperature, high pressure, flammable, explosive, and corrosive conditions. Background Art

[0002] Currently, in petrochemical plants, in some occasions with requirements for high temperature, high pressure, flammability, explosiveness, and corrosion resistance, when the requirements for pump leakage points are extremely high, the following problems will be encountered when selecting pump equipment:

[0003] Using ordinary balance pipeline connection methods (such as Figure 3 , Figure 4 ), the balance pipe pipeline is complex, and the large number of leakage points leads to an increased leakage risk. When dealing with hazardous media, it may cause relatively large losses, and the risk coefficient for leakage in the above - mentioned working conditions is relatively large.

[0004] In view of the problems existing in the above - mentioned prior art, it is very necessary to research and design a new type of double - casing horizontal multi - stage centrifugal pump with an internal balance pipe structure to overcome the problems existing in the prior art. Summary of the Invention

[0005] In view of the technical problems of the existing double - casing horizontal multi - stage centrifugal pump that requires an external circulation pipeline, resulting in a complex pipeline, many leakage points, and a relatively large risk coefficient, a double - casing horizontal multi - stage centrifugal pump with an internal balance pipe structure is provided. The present utility model mainly obtains a new type of double - casing horizontal multi - stage centrifugal pump with an internal balance pipe structure, which has a novel, compact structure, an internal balance pipeline, no external pipeline for the pump body, low leakage points, high efficiency, and a long service life by setting a balance pipeline inside the pump structure.

[0006] The technical means adopted by the present utility model are as follows:

[0007] A double - casing horizontal multi - stage centrifugal pump with an internal balance pipe structure includes: a drive - end bearing component, a cylinder component, a first - stage middle section, a first - stage impeller, a tapped middle section, a diffuser, a secondary impeller, a middle section, a last - stage middle section, a last - stage diffuser, a pump cover, a balance sleeve, a balance - sleeve gland, a balance disk, a seal housing, a non - drive - end bearing component, and a shaft; the shaft passes through the diffuser, the last - stage diffuser, the first - stage middle section, the middle section, and the last - stage middle section, and the first - stage impeller, the tapped middle section, the secondary impeller, and the balance disk are installed on it, and it is installed inside the cylinder component; the drive - end bearing component is installed outside the cylinder component; the pump cover equipped with the balance sleeve and the balance - sleeve gland is installed on the discharge side of the cylinder component through studs and nuts; the seal housing is installed on the other side outside the cylinder component; a seal component and a non - drive - end bearing component are successively installed at the rear of the seal housing;

[0008] Furthermore, an internal balance pipe structure is also provided inside the cylinder body component and the pump cover;

[0009] Furthermore, the inlet end of the internal balance pipe structure is located on the pump cover, and the outlet end is located at the pump body inlet of the cylinder body component.

[0010] Furthermore, the internal balance pipe structure includes: a balance hole provided inside the pump cover, and a return hole provided inside the cylinder body component;

[0011] Furthermore, the balance hole is connected to the return hole to form a loop inside the pump housing.

[0012] Furthermore, one end of the balance hole communicates with the cavity formed by the balance sleeve, the balance sleeve gland, the balance disk and the seal housing, and the other end is connected to the front end of the return hole;

[0013] Furthermore, the rear end opening of the return hole is located inside the pump body inlet;

[0014] Furthermore, the high-pressure medium after the secondary impeller flows along the gap between the balance disk and the balance sleeve and the balance sleeve gland, enters the return hole of the cylinder body component through the balance hole on the pump cover and flows into the pump body inlet. The medium forms a loop inside the pump housing, realizing the internal balance pipeline, achieving the purpose of balancing the axial force, and there is no external pipeline for the pump body.

[0015] Compared with the prior art, the present utility model has the following advantages:

[0016] 1. For the double-casing horizontal multi-stage centrifugal pump with the internal balance pipe structure provided by the present utility model, through the assembly relationship between the pump cover and the cylinder body component and the pressure difference of the medium at different positions, the medium forms a loop inside the housing, realizing the internal balance pipeline, reducing the external connection pipeline of the pump, improving the safety of the pump, and reducing the piping cost of the pump;

[0017] 2. For the double-casing horizontal multi-stage centrifugal pump with the internal balance pipe structure provided by the present utility model, due to the internal balance pipeline, the leakage points of the pump are reduced, the volumetric loss is reduced, and the efficiency and reliability of the pump are improved

[0018] 3. For the double-casing horizontal multi-stage centrifugal pump with the internal balance pipe structure provided by the present utility model, this advantage is particularly prominent when transporting high-temperature, high-pressure, flammable, explosive, and corrosive media; its large-scale market launch will surely produce positive social benefits and remarkable economic benefits.

[0019] In summary, applying the technical solution of the present utility model solves the problems in the prior art that the existing double-casing horizontal multi-stage centrifugal pump needs to be externally connected with a circulation pipeline, resulting in complex pipelines, many leakage points, and a relatively high risk coefficient. Brief Description of the Drawings

[0020] 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 required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Attached Figure 1 is a schematic structural diagram of the present invention;

[0022] Attached Figure 2 is a schematic diagram of the medium flowing in the built-in balance pipeline;

[0023] Attached Figure 3 is a front view of the connection method of the existing external balance pipeline;

[0024] Attached Figure 4 is a side view of the connection method of the existing external balance pipeline.

[0025] In the figure: 1. Driving end bearing component; 2. Cylinder component; 2.1. Return hole; 2.2. Pump body inlet; 3. First stage middle section; 4. First stage impeller; 5. Tap middle section; 6. Guide vane; 7. Secondary impeller; 8. Middle section; 9. Last stage middle section; 10. Last stage guide vane; 11. Pump cover; 11.1. Balance hole; 12. Balance sleeve; 13. Balance sleeve gland; 14. Balance disk; 15. Sealing box body; 16. Non-driving end bearing component; 17. Shaft. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will detail the present invention with reference to the drawings and in combination with the embodiments.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model: the orientation words "inside, outside" refer to the inside and outside relative to the outline of each component itself.

[0031] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the drawing is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding interpretations are made for the spatial relative descriptions used here.

[0032] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, these terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0033] As shown in the figure, the present utility model provides a double-casing horizontal multi-stage centrifugal pump with an internal balancing pipe structure, including: a drive-end bearing component 1, a casing component 2, a first-stage intermediate section 3, a first-stage impeller 4, a tapping intermediate section 5, a diffuser 6, a secondary impeller 7, an intermediate section 8, a last-stage intermediate section 9, a last-stage diffuser 10, a pump cover 11, a balancing sleeve 12, a balancing sleeve gland 13, a balancing disc 14, a sealing housing 15, a non-drive-end bearing component 16, and a shaft 17; the shaft 17 passes through the diffuser 6, the last-stage diffuser 10, the first-stage intermediate section 3, the intermediate section 8, and the last-stage intermediate section 9, and the first-stage impeller 4, the tapping intermediate section 5, the secondary impeller 7, and the balancing disc 14 are installed thereon and are arranged inside the casing component 2; the drive-end bearing component 1 is installed outside the casing component 2; the pump cover 11 equipped with the balancing sleeve 12 and the balancing sleeve gland 13 is installed on the discharge side of the casing component 2 through studs and nuts; the sealing housing 15 is installed on the other side outside the casing component 2; a sealing component and a non-drive-end bearing component 16 are successively installed at the rear of the sealing housing 15; an internal balancing pipe structure is further provided inside the casing component 2 and the pump cover 11; the inlet end of the internal balancing pipe structure is located on the pump cover 11, and the outlet end is located at the pump body inlet 2.2 of the casing component 2.

[0034] The internal balancing pipe structure includes: a balancing hole 11.1 provided inside the pump cover 11, and a return hole 2.1 provided inside the casing component 2; the balancing hole 11.1 communicates with the return hole 2.1 to form a loop inside the pump casing.

[0035] One end of the balance hole 11.1 communicates with the cavity formed by the balance sleeve 12, the balance sleeve gland 13, the balance disk 14 and the sealing housing 15, and the other end is connected to the front end of the return hole 2.1; the rear end opening of the return hole 2.1 is located inside the pump body inlet 2.2; the high-pressure medium after the secondary impeller 7 flows along the gap between the balance disk 14 and the balance sleeve 12 and the balance sleeve gland 13, enters the return hole 2.1 of the cylinder body component through the balance hole 11.1 on the pump cover 11 and flows into the pump body inlet 2.2. The medium forms a loop inside the pump housing, realizing an internal balance pipeline, achieving the purpose of balancing the axial force, and there is no external pipeline for the pump body.

[0036] 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 it; 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 they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-casing horizontal multi-stage centrifugal pump with a built-in balance pipe structure, comprising: The driving end bearing component (1), cylinder component (2), first-stage middle section (3), first-stage impeller (4), tapping middle section (5), guide vane (6), secondary impeller (7), middle section (8), last-stage middle section (9), last-stage guide vane (10), pump cover (11), balance sleeve (12), balance sleeve gland (13), balance disk (14), seal housing (15), non-driving end bearing component (16) and shaft (17); the shaft (17) passes through the guide vane (6), last-stage guide vane (10), first-stage middle section (3), middle section (8) and last-stage middle section (9), and the first-stage impeller (4), tapping middle section (5), secondary impeller (7) and balance disk (14) are installed on it, and it is installed inside the cylinder component (2); the driving end bearing component (1) is installed outside the cylinder component (2); the pump cover (11) equipped with the balance sleeve (12) and balance sleeve gland (13) is installed on the discharge side of the cylinder component (2) through studs and nuts; the seal housing (15) is installed on the other side outside the cylinder component (2); the seal component and non-driving end bearing component (16) are successively installed at the rear of the seal housing (15); it is characterized in that: An internal balance pipe structure is further provided inside the cylinder component (2) and the pump cover (11); The inlet end of the internal balance pipe structure is located on the pump cover (11), and the outlet end is located at the pump body inlet (2.2) of the cylinder component (2).

2. The double-casing horizontal multi-stage centrifugal pump with the internal balance pipe structure according to claim 1, characterized in that: The internal balance pipe structure includes: a balance hole (11.1) provided inside the pump cover (11), and a return hole (2.1) provided inside the cylinder component (2); The balance hole (11.1) is communicated with the return hole (2.1) to form a loop inside the pump housing.

3. The double-casing horizontal multi-stage centrifugal pump with the internal balance pipe structure according to claim 2, characterized in that: One end of the balance hole (11.1) is communicated with the cavity formed by the balance sleeve (12), balance sleeve gland (13), balance disk (14) and seal housing (15), and the other end is communicated with the front end of the return hole (2.1); The rear end opening of the return hole (2.1) is located inside the pump body inlet (2.2); The high-pressure medium after the secondary impeller (7) flows along the gap between the balance disk (14) and the balance sleeve (12), balance sleeve gland (13), enters the return hole (2.1) of the cylinder component through the balance hole (11.1) on the pump cover (11) and flows into the pump body inlet (2.2). The medium forms a loop inside the pump housing, realizing the internal balance pipeline, achieving the purpose of balancing the axial force, and there is no external pipeline for the pump body.

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