CN114893410A

CN114893410A - Urine pump with mechanical seal

Info

Publication number: CN114893410A
Application number: CN202210706241.2A
Authority: CN
Inventors: 董彬; 肖华忠
Original assignee: Dalian Xinhua Pump Industry Co ltd
Current assignee: Dalian Xinhua Pump Industry Co ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-08-12

Abstract

The invention relates to a mechanically sealed urine pump, wherein an impeller is arranged at the left end of a pump shaft and is arranged in a pump body, a liquid inlet is formed in the left side of the pump body, a liquid outlet is formed in the upper side of the pump body, the liquid inlet and the liquid outlet are both communicated with an inner cavity of the pump body, a pump body shell is arranged on the outer side of the pump body, a dead-angle-free heat insulation structure I is formed between the pump body shell and the pump body, a pump cover is fixedly arranged on the rear side of the pump body, a dead-angle-free heat insulation structure II is formed between the pump cover and the pump body, the impeller and the pump body are connected through a motion power sealing assembly, a guide conical sealing cavity is formed between the pump shaft and the pump body, and a mechanical sealing device is arranged in the guide conical sealing cavity. The invention has good sealing performance, has no leakage and no fault after continuous operation for 8000 hours, and saves manpower and material resources; the anti-crystallization and anti-particle structure is arranged, and the effects of preventing medium crystallization and material deposition are achieved.

Description

Urine pump with mechanical seal

Technical Field

The invention relates to the field of urine pumps, in particular to a mechanically sealed urine pump.

Background

Urine pumps are commonly used in triamine plants for the transport of molten urea solutions (containing 2% of trichlorocyanamide powder, small amounts of isocyanic acid) in urea production. Compared with other media, the medium has the characteristics of high temperature, easy crystallization and strong adsorbability, and has higher requirements on the pump and the sealing structure under the condition that the three media exist simultaneously.

The existing pump has some defects in use, on one hand, the pump is seriously sealed and leaked, and has larger potential safety hazards such as environmental protection and the like; on the other hand, crystallization often occurs because of the properties of the medium.

Disclosure of Invention

In order to overcome the defects of the prior art, a mechanically sealed urine pump is provided to solve the problems in the background art. According to the invention, the first dead-corner-free heat insulation structure and the second dead-corner-free heat insulation structure are arranged on the outer side of the pump body, so that crystallization is effectively avoided according to the characteristics of the medium; the impeller and the pump body upper body cover sealing ring I and the body cover sealing ring II form a motion power sealing ring, so that the effects of crystallization prevention, particle prevention and locking prevention are achieved; a mechanical sealing device is arranged in the guide conical sealing cavity and serves as a protective sealing structure for the particles and the easy crystallization.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the utility model provides a mechanical seal's urine pump, including the impeller, the impeller mounting is at the pump shaft left end and sets up in the pump body, the inlet is seted up on the left of the pump body, the liquid outlet is seted up to the pump body upside, inlet and liquid outlet all are linked together with pump inner chamber, the pump body outside is provided with pump body shell, form no dead angle insulation construction one between pump body shell and the pump body, the fixed pump cover that is provided with in pump body rear side, form no dead angle insulation construction two between the pump cover and the pump body, connect through motion power seal assembly between the impeller and the pump body, form the direction toper seal chamber between the pump shaft and the pump body, be provided with mechanical seal device in the direction toper seal chamber.

As a further technical scheme of the invention: the motion power sealing assembly comprises a first body cover sealing ring fixedly arranged on the front side and the rear side of the impeller, a second body cover sealing ring corresponding to the first body cover sealing ring is fixedly arranged in the pump body, and the second body cover sealing ring is in rotating fit with the first body cover sealing ring. The first body cover sealing ring and the second body cover sealing ring are both circular rings, the first body cover sealing ring rotates along with the impeller, the gap between the first body cover sealing ring and the second body cover sealing ring is small, the first body cover sealing ring and the second body cover sealing ring rotate statically to form spiral force, the efficiency is improved, and particles are prevented from being blocked and locked by dry grinding.

As a further technical scheme of the invention: and a first shaft sleeve and a second shaft sleeve are arranged around the outer side of the pump shaft.

As a further technical scheme of the invention: the mechanical sealing device comprises a static ring assembly and a movable ring assembly which are sleeved on the second shaft sleeve, the surfaces of the static ring assembly and the movable ring assembly are mutually attached and matched for use, an O-shaped sealing ring is arranged on the movable ring assembly, a spring and a gland are sequentially arranged on the right side of the static ring assembly, one end of the spring is fixed on the static ring assembly, and the other end of the spring is fixed on the inner end face of the gland. The mechanical sealing device is a particle and easy-crystallization protective sealing structure and plays a role in preventing medium crystallization and material deposition. The media particles or crystals can cause them to fail and fail to compensate for continued protection of the end face.

As a further technical scheme of the invention: the impeller and the pump shaft are connected through an impeller key. The shaft shoulder of the pump shaft is positioned with the impeller nut, and the impeller key transmits torque.

As a further technical scheme of the invention: the impeller and the pump body are internally provided with wing-shaped flow guide mechanisms. The impeller rotates to form strong flowing vortex toward the outlet, so that crystallization and particles are prevented from being formed, the phenomenon that a runner is blocked by precipitation is avoided, and the rapid starting of the standby pump is guaranteed.

The invention has the beneficial effects that:

according to the invention, the first dead-corner-free heat insulation structure and the second dead-corner-free heat insulation structure are arranged on the outer side of the pump body, so that the temperature of the medium in the pump body can be ensured to be constant by arranging the first dead-corner-free heat insulation structure and the second dead-corner-free heat insulation structure aiming at the characteristics that the medium has high temperature, is easy to crystallize and the like, and the crystallization is effectively prevented.

The impeller and the pump body are connected through the motion power sealing assembly, the motion power sealing assembly comprises a first body cover sealing ring fixedly arranged on the front side and the rear side of the impeller, two second body cover sealing rings corresponding to the first body cover sealing ring are fixedly arranged in the pump body, the first body cover sealing ring rotates along with the impeller, a gap between the first body cover sealing ring and the second body cover sealing ring is small, and the first body cover sealing ring rotates in a dynamic mode and the second body cover sealing ring in a static mode to form a spiral force, so that the efficiency is improved, and particle blockage and dry grinding locking are prevented.

According to the invention, the mechanical sealing device is arranged in the guide conical sealing cavity, and the mechanical sealing device is a particle and easy-crystallization protective sealing structure, so that the effects of preventing medium crystallization and material deposition are achieved.

The invention is characterized in that the impeller and the pump body are internally provided with the wing-shaped flow guide mechanism, the impeller rotates to form strong flow vortex toward the outlet, and the wing-shaped flow guide mechanism prevents the formation of crystals and particles, thereby avoiding the blockage of a flow passage by precipitation and ensuring the quick start of the standby pump.

The sealing device has good sealing performance, has no leakage and no fault after continuous operation for 8000 hours, and saves manpower and material resources; the anti-crystallization and anti-particle structure is arranged, and the effects of preventing medium crystallization and material deposition are achieved.

Drawings

FIG. 1 is a schematic view of the main structure of the present invention;

FIG. 2 is a schematic view of the main structure of the pump body;

FIG. 3 is a schematic view of the main structure of the mechanical seal device;

fig. 4 is a partially enlarged view of a in fig. 1.

In the figure: the pump comprises a pump body 1, an impeller 2, a pump shaft 3, a pump body 4, a liquid inlet 5, a liquid outlet 6, a pump body shell 7, a dead-corner-free heat preservation structure I, a pump cover 8, a dead-corner-free heat preservation structure II, a guide conical sealing cavity 10, a mechanical sealing device 11, a body cover sealing ring I, a body cover sealing ring II 13, a body cover sealing ring I, a shaft sleeve I14, a shaft sleeve II 15, a static ring assembly 16, a movable ring assembly 17, an O-shaped sealing ring 18, a spring 19, a gland 20, an impeller key 21 and a wing-shaped flow guide mechanism 22.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a mechanically sealed urine pump includes an impeller 1, the impeller 1 is installed at the left end of a pump shaft 2 and is arranged in a pump body 3, and the impeller 1 and the pump shaft 2 are connected through an impeller key 21. The shoulder of the pump shaft 2 is positioned with the impeller nut and the impeller key 21 transmits torque.

Referring to fig. 2, a liquid inlet 4 is arranged on the left side of the pump body 3, a liquid outlet 5 is arranged on the upper side of the pump body 3, and the liquid inlet 4 and the liquid outlet 5 are both communicated with the inner cavity of the pump body 3. The impeller 1 is driven by the pump shaft 2 to rotate, work is performed on media positioned among the blades, the media are thrown to the periphery from the center of the impeller 1 under the action of centrifugal force, and when fluid reaches the periphery of the impeller 1, the flow velocity is very high. The central pressure of the impeller 1 is reduced and is lower than the pressure of the inlet pipe, fluid flows into the impeller 1 through the liquid inlet 4 under the action of the pressure difference and continuously and circularly flows, and the medium is continuously sucked up. The pump body 3 collects the media thrown out from the blades, and the liquid flows along the gradually expanding direction of the volute-shaped channel in the pump body 3 and finally flows out from the liquid outlet 5, so that the kinetic energy of the fluid is converted into static pressure energy, and the energy loss is reduced. Therefore, the pump body 3 not only collects the liquid, but also is an energy conversion device, and the kinetic energy is converted into potential energy to form the flow rate and the lift of the pump.

Referring to fig. 1, a pump body housing 6 is arranged outside the pump body 3, and a dead-corner-free thermal insulation structure i 7 is formed between the pump body housing 6 and the pump body 3, that is, the dead-corner-free thermal insulation structure i 7 is a cavity formed between the pump body housing 6 and the pump body 3. The pump cover 8 is fixedly arranged on the rear side of the pump body 3, and the pump body 3 and the pump cover 8 are positioned by adopting a seam allowance and are connected by bolts. A dead-angle-free heat insulation structure II 9 is formed between the pump cover 8 and the pump body 3, and the dead-angle-free heat insulation structure II 9 is a cavity formed between the pump cover 8 and the pump body 3.

The liquid urine pump in triamine workshop has the following media: the medium has the characteristics of high temperature, easy crystallization and the like, and the temperature of the medium in the pump body 3 is ensured to be constant by arranging a dead-corner-free heat preservation mechanism I7 and a dead-corner-free heat preservation structure II 9, so that crystallization is effectively prevented.

Referring to fig. 1 and 4, the impeller 1 and the pump body 3 are connected through a motion power sealing assembly, the motion power sealing assembly comprises a first body cover sealing ring 12 fixedly arranged on the front side and the rear side of the impeller 1, two second body cover sealing rings 13 corresponding to the first body cover sealing ring 12 are fixedly arranged in the pump body 3, and the second body cover sealing rings 13 are in running fit with the first body cover sealing rings 12. Body lid sealing ring one 12 and body lid sealing ring two 13 are the ring shape, and body lid sealing ring one 12 is rotatory along with impeller 1, and the clearance is little between body lid sealing ring one 12 and the body lid sealing ring two 13, and one moves a quiet rotation, forms the screw power, raises the efficiency, prevents that the granule from blockking up and dry grinding locking.

Referring to fig. 1 and 3, a guide conical seal cavity 10 is formed between the pump shaft 2 and the pump body 3, and a mechanical seal device 11 is arranged in the guide conical seal cavity 10. The first shaft sleeve 14 and the second shaft sleeve 15 are arranged around the outer side of the pump shaft 2. The mechanical sealing device 11 comprises a static ring component 16 and a movable ring component 17 which are sleeved on a second shaft sleeve 15, the surfaces of the static ring component 16 and the movable ring component 17 are mutually attached and matched for use, an O-shaped sealing ring 18 is sleeved on the movable ring component 17, a spring 19 and a gland 20 are sequentially arranged on the right side of the static ring component 16, one end of the spring 19 is fixed on the static ring component 16, and the other end of the spring 19 is fixed on the inner end face of the gland 20. A mechanical sealing device 11 is arranged in the guide conical sealing cavity 10, and the mechanical sealing device 11 is a particle and easy-crystallization protective sealing structure and plays a role in preventing medium crystallization and material deposition. The media particles or crystals can cause them to fail and fail to compensate for continued protection of the end face.

Referring to fig. 1, inside the impeller 1 and the pump body 3 is a wing-shaped flow guide mechanism 22. Impeller 1 rotates and forms the vortex that flows toward the exit by force, prevents to form crystallization and granule to avoid deposiing and block up the runner, guarantee to be equipped with quick start of pump.

Referring to fig. 1, the impeller 1 adopts a high-efficiency hydraulic design, adopts CFD to calculate fluid dynamics, analyzes and calculates the pressure distribution and speed distribution relationship in the pump body 3, optimizes the flow channel design of the pump, ensures that the pump body 3 has a high-efficiency hydraulic shape line, and improves the efficiency of the pump. Referring to fig. 1, a bearing component is arranged on the right side of the pump shaft 2, and the pump cover 8 and the bearing component are positioned by adopting a seam allowance and are connected by bolts.

The specific implementation mode of the invention is as follows:

the pump shaft 2 is driven by the driving mechanism to rotate, so that the impeller 1 is driven to rotate, the impeller 1 is driven by the pump shaft 2 to rotate at a high speed, work is applied to media positioned among the blades, the media are thrown to the periphery from the center of the impeller 1 under the action of centrifugal force, and when fluid reaches the periphery of the impeller 1, the flow rate is very high. The central pressure of the impeller 1 is reduced and is lower than the pressure of the inlet pipe, fluid flows into the impeller 1 through the liquid inlet 4 under the action of the pressure difference and continuously and circularly flows, and the medium is continuously sucked up. The pump body 3 collects the media thrown out from the blades, and the liquid flows along the gradually expanding direction of the volute-shaped channel in the pump body 3 and finally flows out from the liquid outlet 5. Therefore, as long as the impeller 1 is continuously rotated, the medium is continuously sucked and discharged.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A mechanically sealed urine pump comprises an impeller (1), wherein the impeller (1) is arranged at the left end of a pump shaft (2) and is arranged in a pump body (3), a liquid inlet (4) is formed in the left side of the pump body (3), a liquid outlet (5) is formed in the upper side of the pump body (3), the liquid inlet (4) and the liquid outlet (5) are communicated with the inner cavity of the pump body (3), the pump is characterized in that a pump shell (6) is arranged on the outer side of the pump body (3), a dead-angle-free heat insulation structure I (7) is formed between the pump shell (6) and the pump body (3), a pump cover (8) is fixedly arranged on the rear side of the pump body (3), a dead-angle-free heat insulation structure II (9) is formed between the pump cover (8) and the pump body (3), the impeller (1) and the pump body (3) are connected through a motion power sealing assembly, a guide conical sealing cavity (10) is formed between the pump shaft (2) and the pump body (3), and a mechanical sealing device (11) is arranged in the guide conical sealing cavity (10).

2. A mechanically sealed urine pump according to claim 1, wherein: the motion power sealing assembly comprises a first body cover sealing ring (12) fixedly arranged on the front side and the rear side of the impeller (1), two second body cover sealing rings (13) corresponding to the first body cover sealing ring (12) are fixedly arranged in the pump body (3), and the second body cover sealing ring (13) is in running fit with the first body cover sealing ring (12).

3. A mechanically sealed urine pump according to claim 1, wherein: and a first shaft sleeve (14) and a second shaft sleeve (15) are arranged on the outer side of the pump shaft (2) in a surrounding manner.

4. A mechanically sealed urine pump according to claim 3, wherein: mechanical seal device (11) are including establishing quiet ring subassembly (16) and rotating ring subassembly (17) on axle sleeve two (15) at the cover, quiet ring subassembly (16) and rotating ring subassembly (17) surface laminate each other and cooperate the use, be provided with O type sealing washer (18) on rotating ring subassembly (17), quiet ring subassembly (16) right side sets gradually spring (19) and gland (20), the one end of spring (19) is fixed on quiet ring subassembly (16), the other end of spring (19) is fixed on the interior terminal surface of gland (20).

5. A mechanically sealed urine pump according to claim 1, wherein: the impeller (1) is connected with the pump shaft (2) through an impeller key (21).

6. A mechanically sealed urine pump according to claim 1, wherein: the impeller (1) and the pump body (3) are internally provided with wing-shaped guide mechanisms (22).