Sealing sleeve assembly at driving end of centrifugal pump and centrifugal pump

Abstract

The utility model provides a sealing sleeve assembly of a centrifugal pump driving end and a centrifugal pump, and belongs to the technical field of centrifugal pumps. Comprising a pump body, a shaft, a movable ring and a static ring, and further comprises a fixed piece arranged in the pump body and located at one end of the movable ring; the spring is arranged on the fixing sheet; the spring comprises an outer layer and an inner layer, the outer layer is made of common carbon steel, and the inner layer is made of invar alloy. The spring is arranged and is divided into the first section, the second section and the third section, and the screw pitch and the cross section area of each section are gradually reduced, so that stress can be better distributed, the stress is prevented from being concentrated on a certain point, the risk of fatigue failure is reduced, and the service life of the spring is prolonged. And meanwhile, the spring adopts a bimetal structure of which the outer layer is made of common carbon steel and the inner layer is made of invar alloy, so that the stable performance of the spring can be kept under complex working conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal pump technical field, especially centrifugal pump drive end's sealing sleeve subassembly and centrifugal pump. BACKGROUND

[0002] Centrifugal pump is a kind of fluid conveying equipment widely used, its drive end sealing sleeve subassembly is to prevent the liquid in the pump from leaking along the axis, ensure that centrifugal pump can effectively transport liquid in the running process, avoid liquid leakage to cause pollution to environment, cause corrosion to equipment foundation and surrounding facilities and other adverse effects;Prevent external air, dust, impurities etc. from entering the pump, avoid to cause pollution to the working medium in the pump, affect the normal operation and service life of pump.

[0003] At present, the existing centrifugal pump sealing technology usually adopts conventional spring, and the spring is usually designed with equal pitch and equal cross section, in the running process of centrifugal pump, especially when starting, stopping and load changing sharply, due to uneven force of dynamic ring, spring is prone to stress concentration phenomenon, which not only causes spring to fail due to fatigue prematurely, and service life is greatly reduced, but also causes unstable axial force of spring to dynamic ring, and further damages the sealing state of dynamic ring and static ring, and aggravates the risk of medium leakage, therefore, the application provides a kind of sealing sleeve subassembly of centrifugal pump drive end and centrifugal pump to meet the needs. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide a kind of sealing sleeve subassembly of centrifugal pump drive end to solve the existing centrifugal pump sealing technology, usually adopt conventional spring, when starting, stopping and load changing sharply, due to uneven force of dynamic ring, spring is prone to stress concentration phenomenon.

[0005] To solve the above technical problems, the utility model provides the following technical scheme.

[0006] A kind of sealing sleeve subassembly of centrifugal pump drive end, it include: pump body, shaft, dynamic ring and static ring, still include: fixed sheet, it is set in the pump body, and it is located at one end of the dynamic ring;Spring is set on the fixed sheet;The spring includes outer layer and inner layer, the outer layer adopts ordinary carbon steel material, the inner layer adopts inwag alloy material;The spring is divided into first section, second section and third section, the pitch of the first section is P1, the pitch of the third section is P2, the pitch of the second section is gradually changed from P1 to P2;The pitch of the first section, the pitch of the second section and the pitch of the third section gradually decrease;The area of the first section cross section, the area of the second section cross section and the area of the third section cross section gradually decrease.

[0007] Transition fillet is used between the first section, the second section and the third section.

[0008] Further comprising: two first notches arranged on the movable ring; and two second notches arranged on the stationary ring.

[0009] The first notch and the second notch cooperate to form a placement cavity, and the placement cavity is annular.

[0010] The surface of the sealing ring is made of a corrugated elastic material, which is used to adapt to the gap change between the movable ring and the stationary ring.

[0011] Further comprising: a third notch arranged on the movable ring and close to one end of the shaft, and the third notch is annular.

[0012] Further comprising: a sealing ring arranged on the third notch.

[0013] Further comprising: a ring seat arranged in the pump body and wrapping the spring away from one end of the fixed sheet.

[0014] A centrifugal pump comprising the sealing sleeve assembly of any one of the above.

[0015] Compared with the prior art, the utility model has at least the following beneficial effects.

[0016] In the above scheme, by arranging the spring, the spring is divided into a first section, a second section and a third section, and the pitch and cross-sectional area of each section are gradually reduced, which helps to better distribute stress and avoid stress concentration on a certain point, reduces the risk of fatigue failure, and at the same time, the spring adopts a bimetallic structure with an outer layer of ordinary carbon steel and an inner layer of invar, which helps the spring to maintain stable performance under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of the sealing sleeve assembly of the centrifugal pump driving end.

[0018] Figure 2 It is Figure 1 It is an enlarged view of A.

[0019] Figure 3 It is Figure 1 It is an enlarged view of B.

[0020] Figure 4 It is a schematic view of the spring structure.

[0021] Figure 5 It is a schematic view of the sealing ring structure.

[0022] Figure 6 It is a schematic view of the outer layer structure.

[0023] [REFERENCE SIGNS]

[0024] 1, pump body; 2, fixed sheet; 3, ring seat; 4, shaft; 5, spring; 6, moving ring; 7, static ring; 8, sealing ring; 9, first gap; 10, placing cavity; 11, sealing ring; 12, second gap; 13, third gap; 51, first section; 52, second section; 53, third section; 54, outer layer; 55, inner layer.

[0025] As shown in the drawings, in order to clearly realize the structure of the embodiment of the utility model, specific structures and devices are marked in the drawings, but this is only for the need of illustration, and is not intended to limit the utility model in the specific structure, device and environment, according to the specific need, the ordinary skilled in the art can adjust or modify these devices and environment, and the adjustment or modification still includes in the scope of the appended claims. DETAILED DESCRIPTION

[0026] The utility model provides a kind of sealing sleeve assembly of centrifugal pump driving end and centrifugal pump in combination with drawings and specific embodiments are described in detail below.It is explained here that, in order to make embodiment more detailed, the following embodiment is best, preferred embodiment, for some known technology, other alternative ways can also be used by the person skilled in the art to implement;And part of the drawings is only for more specific description of embodiment, and is not intended to be specific to the utility model.

[0027] As Figure 1 - Figure 6 The embodiment of the utility model provides a kind of sealing sleeve assembly of centrifugal pump driving end, including: pump body 1, shaft 4, moving ring 6 and static ring 7, still include: fixed sheet 2, it is arranged in pump body 1, and located in one end of moving ring 6;Spring 5 is arranged on fixed sheet 2;Spring 5 includes outer layer 54 and inner layer 55, outer layer 54 uses ordinary carbon steel material, and inner layer 55 uses invar alloy material;Spring 5 is divided into first section 51, second section 52 and third section 53, the pitch of first section 51 is P1, the pitch of third section 53 is P2, and the pitch of second section 52 is gradually changed from P1 to P2;The pitch of first section 51, the pitch of second section 52 and the pitch of third section 53 gradually decrease;The area of the cross section of first section 51, the area of the cross section of second section 52 and the area of the cross section of third section 53 gradually decrease.

[0028] The spring 5 adopts the material combination of outer layer 54 of common carbon steel and inner layer 55 of invar alloy. The invar alloy has a low thermal expansion coefficient, and can effectively reduce the uneven deformation of the spring 5 caused by thermal expansion and contraction when the temperature changes, such as temperature fluctuations during the start and stop process of the centrifugal pump. The common carbon steel provides sufficient strength to ensure the mechanical properties of the spring 5 as a whole. The spring 5 is divided into a first section 51, a second section 52 and a third section 53. The first section 51 has a pitch P1, the third section 53 has a pitch P2, and the pitch of the second section 52 gradually changes from P1 to P2, and the pitch of each section gradually decreases. This design makes the force distribution of the spring 5 more uniform when subjected to the force transmitted by the moving ring 6.

[0029] A transition fillet is provided between the first section 51, the second section 52 and the third section 53. By providing a transition fillet, the stress concentration phenomenon of the spring 5 during operation is reduced, effectively preventing the risk of fatigue fracture of the spring 5 caused by stress concentration.

[0030] It also includes two first notches 9 provided on the moving ring 6 and two second notches 12 provided on the static ring 7. The first notch 9 and the second notch 12 correspond to each other. By providing the placement cavity 10, a stable and precise installation position is provided for the sealing ring 8.

[0031] The first notch 9 and the second notch 12 cooperate to form the placement cavity 10, which is annular. The sealing ring 8 is arranged in the placement cavity 10. When the moving ring 6 produces instantaneous displacement due to vibration, the sealing ring 8 can move in the annular placement cavity 10, always maintaining close contact with the moving ring 6 and the static ring 7, ensuring that the sealing effect is not affected.

[0032] The surface of the sealing ring 8 adopts a corrugated elastic material, which is used to adapt to the gap change between the moving ring 6 and the static ring 7. When the temperature rises, the moving ring 6 and the static ring 7 may expand due to thermal expansion, causing the gap to become smaller. At this time, the corrugations of the sealing ring 8 will be compressed, using its elastic potential to adapt to this change, still maintaining a tight sealing state, and the corrugated elastic material of the sealing ring 8 can play a role in buffering and shock absorption.

[0033] It also includes a third notch 13 provided on the moving ring 6 and close to one end of the shaft 4, and the third notch 13 is annular. By providing the third notch 13, there is relative motion between the shaft 4 and the moving ring 6 during the operation of the centrifugal pump, which is easy to produce a gap, which is a potential channel for medium leakage, and the sealing ring 11 installed in the third notch 13 can effectively block this gap.

[0034] It also includes a sealing ring 11 arranged on the third notch 13. By providing the sealing ring 11, the sealing performance between the shaft 4 and the moving ring 6 is improved, and at the same time, due to the elasticity of the sealing ring 11, it can absorb the vibration and impact force generated by the relative motion between the shaft 4 and the moving ring 6 during the rotation of the shaft 4.

[0035] Further comprising: ring seat 3, set in the pump body 1, and the spring 5 is wrapped away from the one end of the fixed sheet 2. By setting the ring seat 3, the function of positioning the spring 5 is played, and by limiting the displacement of the spring 5, the uneven force of the moving ring 6 caused by the swing or deviation of the spring 5 is avoided, and the uniform fit of the sealing surface between the moving ring 6 and the static ring 7 is ensured.

[0036] A centrifugal pump comprising the sealing sleeve assembly of any one of the foregoing centrifugal pump driving end. The centrifugal pump is the prior art, which is not described here.

[0037] The technical scheme provided by the utility model, in the initial stage of centrifugal pump operation, the moving ring 6 is complex and changes greatly, and the larger pitch can make the spring 5 have better elastic deformation ability in this stage, and more flexibly adapt to the initial dynamic change of the moving ring 6, such as the instantaneous impact, vibration and other working conditions when the pump starts, to provide relatively stable support force for the moving ring 6, avoid displacement deviation of the moving ring 6 due to uneven force, and gradually transition to the other end of the spring 5, the pitch gradually decreases to P2, which means that the elastic deformation characteristics of the spring 5 are gradually adjusted, so that the sealing pressure between the moving ring 6 and the static ring 7 can be accurately maintained when the force of the moving ring 6 gradually stabilizes in the subsequent operation process, and the sealing effect is guaranteed; through the two sealing rings 8, double sealing is formed, which can adapt to the gap change between the moving ring 6 and the static ring 7, and reduce the risk of leakage.

[0038] The utility model covers any alternative, modification, equivalent method and scheme made on the essence and scope of the utility model. In order to make the public have thorough understanding of the utility model, the specific details are explained in detail in the above preferred embodiment of the utility model, and the utility model can also be completely understood without the description of these details for those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the utility model, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0039] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled in the art, without departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. A seal sleeve assembly for a drive end of a centrifugal pump, comprising: The pump body (1), the shaft (4), the dynamic ring (6) and the static ring (7) are characterized in that further comprising: The fixed sheet (2) is arranged in the pump body (1) and located at one end of the dynamic ring (6); The spring (5) is arranged on the fixed sheet (2); The spring (5) comprises an outer layer (54) and an inner layer (55), the outer layer (54) is made of ordinary carbon steel material, and the inner layer (55) is made of invar alloy material; The spring (5) is divided into a first section (51), a second section (52) and a third section (53), the first section (51) has a pitch P1, the third section (53) has a pitch P2, and the second section (52) has a pitch gradually changing from P1 to P2; The pitch of the first section (51), the pitch of the second section (52) and the pitch of the third section (53) gradually decrease; The cross-sectional area of the first section (51), the cross-sectional area of the second section (52) and the cross-sectional area of the third section (53) gradually decrease.

2. The seal cartridge assembly for a centrifugal pump drive end as claimed in claim 1, wherein, The first section (51), the second section (52) and the third section (53) adopt a transition fillet.

3. The seal cartridge assembly for a centrifugal pump drive end as claimed in claim 1, wherein, Further comprising: Two first notches (9) are arranged on the dynamic ring (6); Two second notches (12) are arranged on the static ring (7).

4. The seal cartridge assembly for a centrifugal pump drive end as recited in claim 3, wherein, The first notch (9) and the second notch (12) cooperate to form a placement cavity (10), and the placement cavity (10) is annular; A sealing ring (8) is arranged in the placement cavity (10).

5. The seal cartridge assembly for a centrifugal pump drive end as recited in claim 4, wherein, The surface of the sealing ring (8) is made of corrugated elastic material, which is used for self-adapting the gap change between the dynamic ring (6) and the static ring (7).

6. The seal cartridge assembly for a centrifugal pump drive end as recited in claim 1, wherein, Further comprising: A third notch (13) is arranged on the dynamic ring (6) and close to one end of the shaft (4), and the third notch (13) is annular.

7. The seal cartridge assembly for a centrifugal pump drive end as recited in claim 6, wherein, Further comprising: A sealing ring (11) is arranged on the third notch (13).

8. The seal cartridge assembly for a centrifugal pump drive end as recited in claim 1, wherein, Further comprising: A ring seat (3) is arranged in the pump body (1) and wraps one end of the spring (5) away from the fixed sheet (2).

9. A centrifugal pump characterized by The sealing sleeve assembly of the driving end of the centrifugal pump according to any one of claims 1-8. The sealing sleeve assembly of the driving end of the centrifugal pump according to any one of claims 1-8.

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