CN221003242U - High-pressure mouth ring flushing seal cavity structure of cantilever centrifugal pump - Google Patents

Abstract

The utility model discloses a high-pressure port ring flushing seal cavity structure of a cantilever centrifugal pump, which is characterized in that a protective flushing channel is arranged, external high-pressure flushing fluid enters a second connecting structure through the second flushing channel, solid particles remained at the second connecting structure are flushed out, abnormal abrasion of the second connecting structure is avoided, the failure rate is reduced, the service life is prolonged, meanwhile, a part of flushing liquid is flushed to a seal cavity through the protective flushing channel, the mechanical seal structure is flushed, flushing fluid in the seal cavity can flow into a backflow cavity under the action of pressure difference, and is discharged by an impeller after entering a working cavity through a balance hole of the backflow cavity, on the other hand, the pressure in the seal cavity is always higher than the pressure in the backflow cavity of the impeller, so that solid particles are completely prevented from entering the seal cavity, self-circulation flushing is realized, the structure is more compact, the flushing efficiency is higher, and the mechanical seal life is prolonged.

Description

High-pressure mouth ring flushing seal cavity structure of cantilever centrifugal pump

Technical Field

The utility model relates to the technical field of centrifugal pumps, in particular to a high-pressure mouth ring flushing seal cavity structure of a cantilever type centrifugal pump.

Background

The cantilever type centrifugal pump is often used as a quenching oil circulating pump for an ethylene device, the pumped quenching oil contains a large amount of solid particles such as coke particles, the solid particles can enter a mechanical sealing structure arranged between a pump cover and a pump shaft through a gap between shaft sleeves of the pump shaft, so that abnormal abrasion is caused to the mechanical sealing structure, the mechanical sealing structure is often leaked, the service life of the mechanical sealing structure is greatly shortened, great inconvenience is brought to maintenance of the centrifugal pump, and the service performance of the centrifugal pump is further influenced.

Disclosure of Invention

The utility model aims to provide a high-pressure mouth ring flushing seal cavity structure of a cantilever centrifugal pump, which solves the problems that in the prior art, solid particles enter a mechanical seal structure arranged between a pump cover and a pump shaft to cause abnormal abrasion of the mechanical seal, so that the mechanical seal structure is frequently leaked, the service life of the mechanical seal structure is greatly shortened, great inconvenience is brought to maintenance of the centrifugal pump, and the service performance of the centrifugal pump is further influenced.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The high-pressure mouth ring flushing seal cavity structure of the cantilever centrifugal pump comprises a pump body, a pump cover, a pump shaft and an impeller, wherein a medium inlet and a medium outlet are formed in the pump body, a working cavity communicated with the medium inlet and the medium outlet is formed in the pump body, the pump cover is used for sealing the working cavity of the pump body, the pump shaft is arranged on the pump cover and extends to the working cavity, the impeller is arranged on the pump shaft and is positioned in the working cavity, a seal cavity is formed between the pump shaft and the pump cover, and a mechanical seal structure is arranged in the seal cavity;

the first end of impeller is through first connection structure and the rotatable coupling of pump body, the second end of impeller is through second connection structure and pump cover rotatable coupling, be equipped with on the pump body with the first flushing channel of first connection structure intercommunication, be equipped with second flushing channel, protection flushing channel, backward flow chamber on the pump cover, be equipped with balance hole intercommunication on the impeller backward flow chamber with the medium entry, the second flushing channel with second connection structure intercommunication, wherein, the second flushing channel intercommunication outside flushing equipment and second connection structure, protection flushing channel intercommunication second connection structure with the sealed chamber, backward flow chamber with second connection structure intercommunication.

Further, be equipped with the second installation cavity between pump cover and the impeller, second connection structure locates in the second installation cavity, second connection structure is including rotating pump cover mouth ring and the second impeller mouth ring of connecting, pump cover mouth ring is fixed to be located the inner peripheral wall of pump cover, the fixed cover of second impeller mouth ring is located on the impeller periphery wall, be equipped with the intercommunication on the pump cover mouth ring the second flushing hole of second impeller mouth ring periphery wall, the second flushing channel is through second installation cavity with the second flushing hole reaches the gap between pump cover mouth ring and the second impeller mouth ring communicates respectively the protection flushing channel with the backward flow chamber.

Further, a labyrinth communication channel is arranged between the backflow cavity and the second installation cavity.

Further, a shaft sleeve and a lining which are matched with each other are arranged between the pump shaft, the impeller and the pump cover, the shaft sleeve is sleeved on the pump shaft, the two axial ends of the shaft sleeve are respectively abutted to shaft shoulders of the impeller and the pump shaft, and the lining is arranged between the shaft sleeve and the pump cover.

Further, be equipped with first installation cavity between the pump body with the impeller, first connection structure is located first installation cavity is interior, first connection structure is including rotating pump body mouth ring and the first impeller mouth ring of connecting, pump body mouth ring is fixed to be located the inner peripheral wall of pump body, the fixed cover of first impeller mouth ring is located on the impeller periphery wall, be equipped with the intercommunication on the pump body mouth ring the first washing hole of first impeller mouth ring periphery wall, first washing passageway is through first installation cavity, first washing hole and the clearance intercommunication between pump body mouth ring and the first impeller mouth ring the working cavity.

Further, the impeller is mounted to the pump shaft by a nut.

The utility model provides a high-pressure port ring flushing seal cavity structure of a cantilever centrifugal pump, external high-pressure flushing liquid enters a first connecting structure through a first flushing channel, so that solid particles in pumped media are prevented from entering a rotating gap between a pump port ring and a first impeller port ring, the first flushing channel is arranged to prevent the solid particles from entering the first connecting structure, abnormal abrasion of the first connecting structure is avoided, the failure rate is reduced, the service life is prolonged, and similarly, external high-pressure flushing liquid enters a second connecting structure through a second flushing channel, so that the rotating gap between the pump port ring and the second impeller port ring keeps positive pressure to prevent the solid particles from entering the second connecting structure, the abnormal abrasion of the second connecting structure is avoided, the failure rate is reduced, the service life is prolonged, meanwhile, a part of flushing liquid enters a working cavity through a balance hole under the rotating action of an impeller, so that the solid particles in the pumped media enter the seal cavity through the rotating gap between a shaft sleeve and a liner, and the other part of the flushing liquid always enter the seal cavity through the protection channel, and the pressure difference between the seal cavity and the seal cavity is always kept, and the seal cavity is completely discharged through the seal cavity after the high-pressure is guaranteed, on the other hand, the pressure difference between the seal cavity and the seal cavity is always kept through the seal cavity is completely sealed through the seal cavity, and the seal cavity is completely sealed cavity is avoided, on the seal cavity is completely sealed through the seal cavity, and the seal cavity is completely sealed through the seal cavity is completely through the seal cavity, and the seal cavity is completely through the seal cavity, and self-circulation flushing is realized, the structure is more compact, the flushing efficiency is higher, and the service life of the mechanical seal is prolonged.

Drawings

FIG. 1 is a schematic illustration of the high pressure port ring flushing seal cavity structure of a cantilever centrifugal pump in an embodiment of the utility model;

Fig. 2 is a partially enlarged schematic view at a in fig. 1.

In the figure: 1. a pump body; 2. a pump cover; 3. a pump shaft; 4. an impeller; 101. a media inlet; 102. a medium outlet; 103. a working chamber; 104. a first flush channel; 105. a first mounting cavity; 106. a pump body collar; 107. a first impeller collar; 108. a first flushing hole; 201. sealing the cavity; 202. a mechanical seal structure; 203. a second flush channel; 204. protecting the flushing channel; 205. a reflow chamber; 206. a balance hole; 207. a second mounting cavity; 208. a pump cover collar; 209. a second impeller collar; 210. a second flushing hole; 211. a labyrinth communication passage; 301. a shaft sleeve; 302. a bushing; 303. and (3) a nut.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, an embodiment of the present utility model provides a high-pressure port ring flushing seal cavity structure of a cantilever centrifugal pump, including a pump body 1, a pump cover 2, a pump shaft 3 and an impeller 4, wherein the pump body 1 is provided with a medium inlet 101 and a medium outlet 102, a working cavity 103 communicated with the medium inlet 101 and the medium outlet 102 is arranged in the pump body 1, the pump cover 2 is used for sealing the working cavity 103 of the pump body 1, the pump shaft 3 is mounted on the pump cover 2 and extends to the working cavity 103, the impeller 4 is mounted on the pump shaft 3 and is positioned in the working cavity 103, a seal cavity 201 is arranged between the pump shaft 3 and the pump cover 2, and a mechanical seal structure 202 is arranged in the seal cavity 201, generally, the pump shaft 3 is externally connected with a power source, and drives the impeller 4 to rotate by driving the pump shaft 3 to suck medium from the medium inlet 101 into the working cavity 103 and then discharge the medium from the medium outlet 102 through the impeller 4, and the mechanical seal structure 202 between the pump shaft 3 and the pump cover 2 can avoid the medium from entering the power source from the working cavity 103 to cause the centrifugal pump failure;

The first end of impeller 4 is rotatably connected with pump body 1 through first connection structure, the second end of impeller 4 is rotatably connected with pump cover 2 through second connection structure, be equipped with on the pump body 1 with the first flushing channel 104 of first connection structure intercommunication, be equipped with second flushing channel 203 on the pump cover 2, protection flushing channel 204, backflow chamber 205, be equipped with balanced hole 206 intercommunication backflow chamber 205 and medium entry 101 on the impeller 4, second flushing channel 203 and second connection structure intercommunication, wherein, second flushing channel 203 and first flushing channel 104 intercommunication outside flushing equipment, protection flushing channel 204 intercommunication second connection structure and seal chamber 201, backflow chamber 205 and second connection structure intercommunication, balanced hole 206 is used for intercommunication backflow chamber 205 and working chamber 103 intercommunication medium entry 101 promptly.

Specifically, the external high-pressure flushing liquid enters the first connecting structure through the first flushing channel 104, so that positive pressure is kept in a rotation gap between the pump body port ring 106 and the first impeller port ring 107 to avoid solid particles in pumped media from entering, or solid particles remained at the first connecting structure are flushed into the working cavity 103 and then discharged from the medium outlet 102 through the impeller 4 when the pump is restarted after shutdown, and the first flushing channel 104 is arranged to avoid the solid particles from entering the first connecting structure, so that abnormal abrasion of the first connecting structure is avoided, the failure rate is reduced, and the service life is prolonged; similarly, the external high-pressure flushing liquid enters the second connecting structure through the second flushing channel 203, so that the rotation gap between the pump cover opening ring 208 and the second impeller opening ring 209 is kept positive pressure, solid particles are prevented from entering the second connecting structure, and solid particles remained at the second connecting structure can be flushed out when the machine is started again after the machine is stopped, so that abnormal abrasion of the second connecting structure is avoided, the failure rate is reduced, and the service life is prolonged; meanwhile, a part of flushing liquid enters the working cavity 103 from the balance hole 206 through the backflow cavity 205, and is discharged from the medium outlet 102 under the rotation action of the impeller 4, so that flushing liquid in the backflow cavity 205 is guaranteed to be positive pressure and can flow into the backflow cavity 205 through a rotation gap between the shaft sleeve 301 and the bushing 302, solid particles in pumping medium are prevented from entering the sealing cavity 201 through the rotation gap between the shaft sleeve 301 and the bushing 302, another part of flushing liquid is flushed to the sealing cavity 201 through the protection flushing channel 204, the mechanical sealing structure 202 is flushed, and the backflow cavity 205 is communicated with high-pressure flushing liquid through the protection flushing channel 204 and the second flushing channel 203 because the backflow cavity 205 is communicated with the working cavity 103 of the impeller 4, so that the pressure in the sealing cavity 201 is always higher than the pressure of the backflow cavity 205 communicated with the working cavity 103.

In this embodiment, the protection flushing channel 204 is provided on the pump cover 2 in a bypass manner, and the high-pressure flushing fluid can be used for flushing the mechanical seal structure 202, so that the high-pressure external flushing mechanism is not required to be additionally configured for flushing the mechanical seal structure 202, the flushing fluid is saved, and the energy is saved and the environment is protected.

Further, a second mounting cavity 207 is arranged between the pump cover 2 and the impeller 4, a second connection structure is arranged in the second mounting cavity 207, the second connection structure comprises a pump cover opening ring 208 and a second impeller opening ring 209 which are rotationally connected, the pump cover opening ring 208 is fixedly arranged on the inner peripheral wall of the pump cover 2, the second impeller opening ring 209 is fixedly sleeved on the peripheral wall of the impeller 4, a second flushing hole 210 which is communicated with the outer peripheral wall of the second impeller opening ring 209 is arranged on the pump cover opening ring 208, the second flushing channel 203 is communicated with the protective flushing channel 204 and the backflow cavity 205 through the second mounting cavity 207 and the second flushing hole 210, and gaps between the pump cover opening ring 208 and the second impeller opening ring 209 are respectively communicated with each other, namely, in order to ensure the rotation of the pump shaft 3, gaps are reserved between the second impeller opening ring 209 and the pump cover opening ring 208, in order to avoid abrasion of the second impeller opening ring 209 and the pump cover opening ring 208, high-pressure flushing liquid is discharged from the second flushing channel 205 through the second impeller opening ring 203 to the inner peripheral wall, and then enters the inner peripheral wall of the protective sleeve portion of the pump cover ring 208, and then enters the flushing channel 204 through the gap portion of the second flushing channel 205, and the inner peripheral wall of the pump opening ring is kept at a certain pressure, and the inner peripheral portion of the gap is kept at a certain pressure, and the inner side of the flushing channel is a sealing gap is provided, and the inner side of the inner gap is provided with a sealing gap, and the flushing channel is provided with a sealing gap, and the flushing channel is provided.

Preferably, a labyrinth communication channel 211 is arranged between the reflux cavity 205 and the second installation cavity 207, the labyrinth communication channel 211 is generally in a concave-convex runner design, and by the action of the labyrinth communication channel 211 of the pump cover 2, the pressure relief and throttling of flushing liquid can be realized, so that the consumption of the flushing liquid is greatly reduced, and the cost is saved.

In this embodiment, a shaft sleeve 301 and a bushing 302 are disposed between the pump shaft 3, the impeller 4 and the pump cover 2, the shaft sleeve 301 is sleeved on the pump shaft 3, and two axial ends of the shaft sleeve 301 are respectively abutted against shaft shoulders of the impeller 4 and the pump shaft 3, the bushing 302 is disposed between the shaft sleeve 301 and the pump cover 2, the rotation installation between the pump shaft 3 and the pump cover 2 and the impeller 4 is realized through the bushing 302 and the shaft sleeve 301, meanwhile, the liquid in the seal cavity 201 can be reduced from flowing into the backflow cavity 205 through the bushing 302 and the bushing 301, and because the pressure in the seal cavity 201 is always higher than the pressure in the backflow cavity 205 of the impeller 4, flushing liquid in the seal cavity 201 can flow into the backflow cavity 205 through a gap between the bushing 301 and the bushing 302, so that backflow circulation discharge of flushing liquid is realized.

Further, a first mounting cavity 105 is arranged between the pump body 1 and the impeller 4, a first connecting structure is arranged in the first mounting cavity 105, the first connecting structure comprises a pump body orifice ring 106 and a first impeller orifice ring 107 which are rotationally connected, the pump body orifice ring 106 is fixedly arranged on the inner peripheral wall of the pump body 1, the first impeller orifice ring 107 is fixedly sleeved on the outer peripheral wall of the impeller 4, a first flushing hole 108 communicated with the outer peripheral wall of the first impeller orifice ring 107 is arranged on the pump body orifice ring 106, and a first flushing channel 104 is communicated with the working cavity 103 through the first mounting cavity 105, the first flushing hole 108 and a gap between the pump body orifice ring 106 and the first impeller orifice ring 107; the high-pressure flushing fluid is input into the first mounting cavity 105 through the first flushing channel 104, then flows into the gap between the pump body orifice ring 106 and the first impeller orifice ring 107 through the first flushing hole 108, so as to flush the assembly surfaces of the pump body orifice ring 106 and the first impeller orifice ring 107 and maintain positive pressure in the gap, and solid particles are prevented from entering or remaining in the gap between the pump body orifice ring 106 and the first impeller orifice ring 107, so that the abrasion of the pump body orifice ring 106 and the first impeller orifice ring 107 is avoided, and the service life of the pump body orifice ring is influenced.

In this embodiment, the impeller 4 is mounted on the pump shaft 3 through the nut 303, the pump shaft 3 is mounted on the pump cover 2 through the shaft sleeve 301 and the bushing 302, and the impeller 4 is mounted at one end of the pump shaft 3 through the nut 303 in a fastening manner, so that the working stability of the centrifugal pump is ensured.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. A high-pressure mouth ring flushing seal cavity structure of a cantilever centrifugal pump is characterized in that: the pump comprises a pump body, a pump cover, a pump shaft and an impeller, wherein a medium inlet and a medium outlet are formed in the pump body, a working cavity communicated with the medium inlet and the medium outlet is formed in the pump body, the pump cover is used for sealing the working cavity of the pump body, the pump shaft is arranged on the pump cover and extends to the working cavity, the impeller is arranged on the pump shaft and is positioned in the working cavity, a sealing cavity is formed between the pump shaft and the pump cover, and a mechanical sealing structure is arranged in the sealing cavity;

The first end of impeller is through first connection structure and the rotatable coupling of pump body, the second end of impeller is through second connection structure and pump cover rotatable coupling, be equipped with on the pump body with the first flushing channel of first connection structure intercommunication, be equipped with second flushing channel, protection flushing channel, backward flow chamber on the pump cover, be equipped with balance hole intercommunication on the impeller backward flow chamber with the medium entry, the second flushing channel with second connection structure intercommunication, wherein, the second flushing channel intercommunication outside flushing equipment and second connection structure, protection flushing channel intercommunication second connection structure with the sealed chamber, backward flow chamber with second connection structure intercommunication.

2. The high pressure port ring flushing seal cavity structure of a cantilever centrifugal pump according to claim 1, wherein: the pump cover with be equipped with the second installation cavity between the impeller, second connection structure locates the second installation intracavity, second connection structure is including rotating pump cover mouth ring and the second impeller mouth ring of connecting, pump cover mouth ring is fixed to be located the inner peripheral wall of pump cover, second impeller mouth ring cover is fixed to be located on the impeller periphery wall, be equipped with the intercommunication on the pump cover mouth ring the second flushing hole of second impeller mouth ring periphery wall, the second flushing channel is through the second installation cavity with the second flushing hole reaches the pump cover mouth ring with clearance intercommunication respectively between the second impeller mouth ring the protection flushing channel with the backward flow chamber.

3. The high pressure port ring flushing seal cavity structure of a cantilever centrifugal pump according to claim 2, wherein: and a labyrinth communication channel is arranged between the reflux cavity and the second installation cavity.

4. A high pressure port ring flushing seal cavity structure for a cantilever centrifugal pump according to claim 3, wherein: the pump shaft, the impeller and the pump cover are provided with a shaft sleeve and a lining which are matched with each other, the shaft sleeve is sleeved on the pump shaft, two axial ends of the shaft sleeve are respectively abutted to shaft shoulders of the impeller and the pump shaft, and the lining is arranged between the shaft sleeve and the pump cover.

5. The high pressure port ring flushing seal cavity structure of a cantilever centrifugal pump according to claim 4, wherein: the pump body with be equipped with first installation cavity between the impeller, first connection structure is located first installation cavity is internal, first connection structure is including rotating pump body mouth ring and the first impeller mouth ring of connecting, pump body mouth ring is fixed to be located the inner peripheral wall of pump body, the fixed cover of first impeller mouth ring is located on the impeller periphery wall, be equipped with the intercommunication on the pump body mouth ring the first washing hole of first impeller mouth ring periphery wall, first washing passageway is through first installation cavity, first washing hole and the clearance intercommunication between pump body mouth ring and the first impeller mouth ring the working cavity.

6. The high-pressure port ring flushing seal cavity structure of a cantilever centrifugal pump according to any one of claims 1 to 5, wherein: the impeller is mounted to the pump shaft by a nut.