CN220726645U - Multistage feed pump and synthetic ammonia device - Google Patents

Abstract

The application provides a multistage feed pump and synthetic ammonia device, wherein multistage feed pump includes pump case and balanced cover, and the pump case has out the water section, and balanced cover is fixed to be set up on out the water section, and the water section is close to and sets up flutedly on the terminal surface of balanced cover, and the recess is the annular, is provided with the sealing member in the recess. The end face of the water outlet section, which is close to the balance sleeve, is provided with the groove, and the sealing piece is arranged in the groove, so that internal leakage at the annular joint surface between the water outlet section and the balance sleeve can be avoided, cavitation damage at the joint surface can be prevented, the service lives of the water outlet section and the balance sleeve are prolonged, the failure rate of the multistage water supply pump is reduced, and the maintenance cost is reduced; meanwhile, the axial balance force can be prevented from being damaged due to flushing leakage, the gap between the balance disc and the balance sleeve is ensured to be between 0.1mm and 0.2mm, so that the balance disc can safely operate, and the service life of the multistage water supply pump is prolonged.

Description

Multistage feed pump and synthetic ammonia device

Technical Field

The application belongs to the technical field of feed pumps, and particularly relates to a multistage feed pump and an ammonia synthesis device.

Background

The multistage water supply pump comprises a balancing mechanism, the balancing mechanism consists of a balancing disc, a balancing sleeve gland and other parts, all axial forces under the working condition can be balanced, and the thrust bearing bears residual axial forces possibly generated by the balancing mechanism under special conditions, so that the abrasion of the balancing mechanism is reduced, the impeller centering is ensured, and the requirement of mechanical seal on the rotor serial quantity is met.

However, when the water supply pump is used for boiler water supply of the synthetic ammonia device, as the boiler water supply is saturated water at about 125 ℃, the saturated water at about 125 ℃ is greatly different from the physical properties of the water at about 125 ℃ and is extremely easy to be vaporized, especially when the pressure difference at two ends of a leakage channel is extremely large and the leakage flow speed is extremely fast, the leakage easily occurs at the annular joint surface of the balance sleeve and the water outlet section, cavitation damage is easily formed at the joint surface of the balance sleeve and the water outlet section, and the safety operation of the balance device is endangered. The maintenance treatment method generally comprises replacing the damaged balance sleeve, but the water outlet section adjacent to the balance sleeve is damaged, and if the water outlet section is replaced by a larger and more expensive part, a plurality of maintenance costs are increased, the water outlet section is kept for use, the corroded trace of the water outlet section is more obvious, the internal leakage is more serious, and the time interval for re-occurrence of faults is shortened.

Disclosure of Invention

Therefore, the technical problem to be solved by the application is to provide a multistage feed pump and an ammonia synthesis device with few faults and long service life.

In order to solve the problems, the application provides a multistage water supply pump in one aspect, including pump case and balanced cover, the pump case has a water section, balanced cover is fixed to be set up on the water section, the water section is close to set up flutedly on the terminal surface of balanced cover, the recess is annular, be provided with the sealing member in the recess.

Optionally, the grooves include a first groove and a second groove, and a plane where the first groove is located is perpendicular to a plane where the second groove is located.

Optionally, the width of the groove is A, A is more than or equal to 4mm and less than or equal to 5mm, the height of the groove is B, and B is more than or equal to 7mm and less than or equal to 8mm.

Optionally, the multistage water feed pump further comprises a pump shaft and a throttle shaft sleeve, the throttle shaft sleeve is sleeved on the pump shaft, the throttle shaft sleeve is arranged on the radial inner side of the balance sleeve, and a radial gap between the throttle shaft sleeve and the balance sleeve is C, wherein C is more than or equal to 0.4mm and less than or equal to 0.6mm.

Optionally, a spiral groove is formed in the peripheral wall of the throttle sleeve, and the rotation direction of the spiral groove is opposite to the rotation direction of the pump shaft.

Optionally, the multistage water feed pump further comprises an impeller, the impeller is sleeved on the pump shaft, and the diameter of an impeller suction inlet is D, and D is more than or equal to 158mm and less than or equal to 160mm.

Optionally, the impeller is multistage impeller, equidistant setting between the multistage impeller, multistage impeller with the pump shaft can dismantle the connection.

Optionally, the multi-stage feed pump further comprises a guide vane and a middle section, wherein the middle section is arranged on the radial outer side of the multi-stage impeller, the guide vane is arranged between two adjacent impellers, and the guide vane is a multi-stage guide vane.

Optionally, the multistage feed pump is made of martensitic stainless steel, and the sealing element is an O-shaped sealing ring.

In another aspect of the present application, an ammonia plant is provided, including the multi-stage feed pump described above.

Advantageous effects

The embodiment of the utility model provides a multistage water supply pump and an ammonia synthesis device, wherein the multistage water supply pump is provided with a groove on the end surface of a water outlet section, which is close to a balance sleeve, and a sealing piece is arranged in the groove, so that internal leakage at an annular joint surface between the water outlet section and the balance sleeve can be avoided, cavitation damage at the joint surface can be prevented, the service lives of the water outlet section and the balance sleeve are prolonged, the failure rate of the multistage water supply pump is reduced, and the maintenance cost is reduced; meanwhile, the axial balance force can be prevented from being damaged due to flushing leakage, the gap between the balance disc and the balance sleeve is ensured to be between 0.1mm and 0.2mm, so that the balance disc can safely operate, and the service life of the multistage water supply pump is prolonged.

Drawings

FIG. 1 is a schematic view of a multistage feedwater pump according to an embodiment of the present application;

fig. 2 is a partial enlarged view at a in fig. 1.

The reference numerals are expressed as:

1. a pump housing; 11. a water outlet section; 12. a middle section; 2. a balance sleeve; 3. a groove; 31. a first groove; 32. a second groove; 4. a seal; 5. a pump shaft; 6. a throttle sleeve; 7. an impeller; 8. guide vanes.

Detailed Description

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Referring to fig. 1 to 2 in combination, according to an aspect of the embodiment of the present application, there is provided a multistage water feeding pump, including a pump casing 1 and a balance sleeve 2, the pump casing 1 has a water outlet section 11, the balance sleeve 2 is fixedly disposed on the water outlet section 11, a groove 3 is formed on an end surface of the water outlet section 11, which is close to the balance sleeve 2, the groove 3 is in a ring shape, and a sealing member 4 is disposed in the groove 3.

The groove 3 is formed in the end face, close to the balance sleeve 2, of the water outlet section 11, and the sealing piece 4 is arranged in the groove 3, so that internal leakage at the annular joint surface between the water outlet section 11 and the balance sleeve 2 can be avoided, cavitation damage at the joint surface can be prevented, the service lives of the water outlet section 11 and the balance sleeve 2 are prolonged, the failure rate of the multistage water supply pump is reduced, and the maintenance cost is reduced; meanwhile, the axial balance force can be prevented from being damaged due to flushing leakage, the gap between the balance disc and the balance sleeve 2 is ensured to be between 0.1mm and 0.2mm, so that the balance disc can safely operate, and the service life of the multistage water supply pump is prolonged.

Wherein, multistage feed pump is used for improving liquid flow pressure.

Specifically, the multistage water feed pump comprises a pump shell 1, wherein the pump shell 1 comprises a water inlet section, a middle section 12 and a water outlet section 11. The middle section 12 is internally provided with a multi-stage impeller 7 and a multi-stage guide vane 8, and when the pump works, liquid enters the pump from the water inlet section, sequentially flows through each stage impeller 7 and the guide vane 8 to be pressurized step by step until reaching the last stage, and then is sent into the water outlet section 11 to be discharged.

Wherein, multistage feed pump still includes balanced cover 2, and balanced cover 2 is fixed to be set up on play water section 11, and balanced cover 2 is connected with play water section 11, and its connected mode can be bolted connection or welding etc. this application does not do further limit.

Specifically, the balancing sleeve 2 is a stator component of the multistage water supply pump, and the section of the balancing sleeve 2 perpendicular to the central axis of the balancing sleeve 2 is two L-shaped patterns taking the central axis of the balancing sleeve 2 as a symmetrical center.

The end face of the water outlet section 11, which is close to the balance sleeve 2, is provided with a groove 3, namely, the end face of the water outlet section 11, which is attached to the balance sleeve 2, is provided with the groove 3.

Wherein the width of the groove 3 is A, A is more than or equal to 4mm and less than or equal to 5mm, the height of the groove 3 is B, and B is more than or equal to 7mm and less than or equal to 8mm.

Specifically, in the embodiment of the present application, the width of the groove 3 is preferably 4.5mm, and the height of the groove 3 is preferably 7.5mm.

Wherein the recess 3 may be annular or the like.

Specifically, be provided with sealing member 4 in the recess 3, sealing member 4 and recess 3 form the seal structure of play water section 11 and balanced cover 2, can avoid high-pressure liquid to take place to reveal from the annular faying surface department between play water section 11 and the balanced cover 2, can avoid its annular faying surface to take place the cavitation phenomenon simultaneously, improved the life of play water section 11 and balanced cover 2.

In this embodiment, the sealing element 4 is a high-temperature-resistant O-ring.

In the embodiment of the application, the parts such as the pump shell 1 and the guide vane 8 sleeve of the multistage water supply pump are made of martensitic stainless steel, so that the flushing resistance of the through-flow part inside the pump shell 1 can be effectively enhanced, and the service life of the multistage water supply pump is prolonged.

The groove 3 comprises a first groove 31 and a second groove 32, and the plane of the first groove 31 is perpendicular to the plane of the second groove 32.

By arranging the first groove 31 and the second groove 32, and enabling the plane of the first groove 31 to be perpendicular to the plane of the second groove 32, the annular joint surface between the water outlet section 11 and the balance sleeve 2 can be sealed for multiple times, and the sealing effect is improved.

The plurality of first grooves 31 may be disposed, and a plane where the plurality of first grooves 31 are located is perpendicular to the central axis of the balance sleeve 2; the second grooves 32 may be provided in plurality, and the planes of the second grooves 32 are parallel to the central axis of the balance sleeve 2.

Specifically, the sealing elements 4 are disposed in the first groove 31 and the second groove 32, the high-pressure liquid reaches the first groove 31 first, the first groove 31 and the sealing elements 4 are combined to perform primary sealing on the high-pressure liquid, for example, the high-pressure liquid leaks from the first groove 31 and reaches the second groove 32, the second groove 32 and the sealing elements 4 are combined to perform secondary sealing on the high-pressure liquid, it is understood that the amount of liquid leaking from the first groove 31 is less, the pressure is lower, and when the high-pressure liquid flows to the second groove 32, the second groove 32 and the sealing elements 4 can be completely sealed, and the sealing effect is further improved by arranging the first groove 31 and the second groove 32.

The multistage water feed pump further comprises a pump shaft 5 and a throttle shaft sleeve 6, wherein the throttle shaft sleeve 6 is sleeved on the pump shaft 5, the throttle shaft sleeve 6 is arranged on the radial inner side of the balance sleeve 2, and a radial gap between the throttle shaft sleeve 6 and the balance sleeve 2 is C, wherein C is more than or equal to 0.4mm and less than or equal to 0.6mm.

By providing the throttle sleeve 6, the pressure in the balance chamber can be stabilized to achieve the effect of reducing the leakage amount.

The multistage water feed pump further comprises a pump shaft 5, a balance disc and a throttle sleeve 6, wherein the pump shaft 5, the balance disc and the throttle sleeve 6 are rotor components of the multistage water feed pump.

Wherein, the balance disc sets up in the one side that the balance sleeve 2 kept away from the section of intaking, and the balance disc cover is established on pump shaft 5.

Specifically, a gap of 0.1mm-0.2mm exists between the balance disc and the balance sleeve 2 so as to form a water film, and a balance chamber is formed between the balance disc and the balance sleeve 2 and is used for balancing the axial force of the multistage water supply pump.

The throttle shaft sleeve 6 is annular, the throttle shaft sleeve 6 is arranged on the radial inner side of the balance sleeve 2, and the throttle shaft sleeve 6 is sleeved on the pump shaft 5.

Wherein, the radial clearance between the throttle sleeve 6 and the balance sleeve 2 is C, C is more than or equal to 0.4mm and less than or equal to 0.6mm.

Specifically, in the embodiment of the application, the radial clearance between the throttle sleeve 6 and the balance sleeve 2 is 0.45mm, and the high-pressure liquid enters the balance chamber after being depressurized by the throttle sleeve 6.

Wherein, the peripheral wall of the throttle sleeve 6 is provided with a spiral groove which extends along the axial direction of the throttle sleeve 6.

Specifically, the direction of rotation of the spiral groove is opposite to the direction of rotation of the pump shaft 5. The liquid pressure flowing through the throttle sleeve 6 can be reduced by setting the spiral direction of the spiral groove opposite to the rotation direction of the pump shaft 5, so that the liquid pressure in the balance chamber is reduced, the pressure in the balance chamber can be stabilized, the sensitivity of the balance disc and the balance sleeve 2 and the uniformity of water film formation are improved, and the working stability of the multistage water supply pump is improved.

The multistage water feed pump further comprises an impeller 7, the impeller 7 is sleeved on the pump shaft 5, and the diameter of a suction inlet of the impeller 7 is D, and D is more than or equal to 158mm and less than or equal to 160mm.

Specifically, in the embodiment of the present application, the suction port diameter of the impeller 7 is preferably 159mm. The diameter of the suction inlet of the impeller 7 is 159mm, so that the suction resistance of the impeller 7 can be effectively reduced, the necessary cavitation allowance is reduced to be below 4.8mH20, the water conservancy loss and the power consumption are effectively reduced, and the working stability of the multistage water supply pump is improved.

The impellers 7 are multistage impellers 7, the multistage impellers 7 are arranged at equal intervals, and the multistage impellers 7 are detachably connected with the pump shaft 5.

The impeller 7 and the pump shaft 5 are connected in a detachable mode through the fixed connection before, the purpose of increasing and decreasing the number of stages of the impeller 7 according to actual production needs to increase and decrease the water outlet pressure of the multistage water feeding pump can be achieved, the cost is reduced compared with the scheme of the frequency conversion device, the equipment is simple in structure and convenient to assemble and disassemble, and the working efficiency is improved.

Wherein, impeller 7 can set up a plurality of, and impeller 7 sets up quantity and can confirm according to actual demand, does not do further limit this application, and in this application embodiment, impeller 7 is ten grades of impellers 7.

The multistage feed pump further comprises a guide vane 8 and a middle section 12, the middle section 12 is arranged on the radial outer side of the multistage impellers 7, the guide vane 8 is arranged between two adjacent impellers 7, and the guide vane 8 is a multistage guide vane 8.

The guide vane 8 is arranged to collect liquid flowing out of the impeller 7 of the upper stage, convert the direction and transmit the liquid to the inlet of the impeller 7 of the lower stage, and the guide vane 8 is arranged to guide the liquid flow, so that the working stability of the multistage water feeding pump is improved.

The middle section 12 is a middle part of the pump casing 1, and the middle section 12 is provided on the outer peripheral side of the multistage impeller 7.

Specifically, a partition plate is arranged in the middle section 12, and the guide vane 8 is arranged in the middle section 12 through the partition plate.

Wherein, guide vane 8 can set up a plurality ofly, and in this application embodiment, guide vane 8 sets up nine, and nine guide vanes 8 all set up the export side at impeller 7, and guide vane 8 sets up between two adjacent impellers 7 promptly.

In another aspect of the embodiments of the present application, a synthetic ammonia device is provided, including the multi-stage feed pump described above.

Wherein, the ammonia synthesis device comprises three multistage feed pumps.

Specifically, the consumption parameters of spare parts before and after the improvement of the three multistage water feed pumps are shown in the following table:

wherein, 2018 and 2019 are the spare part consumption conditions of the multi-stage feed pump improvement, and 2020-2023 are the spare part consumption conditions of the multi-stage feed pump improvement.

The embodiment of the utility model provides a multistage water supply pump and an ammonia synthesis device, wherein the multistage water supply pump is provided with a groove 3 on the end surface of a water outlet section 11, which is close to a balance sleeve 2, and a sealing piece 4 is arranged in the groove 3, so that internal leakage at the annular joint surface between the water outlet section 11 and the balance sleeve 2 can be avoided, cavitation damage at the joint surface can be prevented, the service lives of the water outlet section 11 and the balance sleeve 2 are prolonged, the fault rate of the multistage water supply pump is reduced, and the maintenance cost is reduced; meanwhile, the axial balance force can be prevented from being damaged due to flushing leakage, the gap between the balance disc and the balance sleeve 2 is ensured to be between 0.1mm and 0.2mm, so that the balance disc can safely operate, and the service life of the multistage water supply pump is prolonged.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiment of the present utility model is not intended to limit the utility model to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model. The foregoing is merely a preferred embodiment of the present application and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the present application.

Claims (9)

1. The multistage water supply pump is characterized by comprising a pump shell (1) and a balance sleeve (2), wherein the pump shell (1) is provided with a water outlet section (11), the balance sleeve (2) is fixedly arranged on the water outlet section (11), a groove (3) is formed in the end face, close to the balance sleeve (2), of the water outlet section (11), the groove (3) is annular, and a sealing element (4) is arranged in the groove (3);

the groove (3) comprises a first groove (31) and a second groove (32), and the plane where the first groove (31) is located is perpendicular to the plane where the second groove (32) is located.

2. The multistage feed pump according to claim 1, characterized in that the width of the grooves (3) is A,4 mm.ltoreq.A.ltoreq.5 mm, the height of the grooves (3) is B,7 mm.ltoreq.B.ltoreq.8 mm.

3. The multistage feed pump according to claim 1, further comprising a pump shaft (5) and a throttle sleeve (6), wherein the throttle sleeve (6) is sleeved on the pump shaft (5), the throttle sleeve (6) is arranged on the radial inner side of the balance sleeve (2), and a radial gap between the throttle sleeve (6) and the balance sleeve (2) is C, wherein C is more than or equal to 0.4mm and less than or equal to 0.6mm.

4. A multistage feed pump according to claim 3, characterized in that the peripheral wall of the throttle sleeve (6) is provided with a helical groove, the direction of rotation of which is opposite to the direction of rotation of the pump shaft (5).

5. The multistage water feed pump according to claim 3, further comprising an impeller (7), wherein the impeller (7) is sleeved on the pump shaft (5), and the diameter of a suction inlet of the impeller (7) is D, and D is more than or equal to 158mm and less than or equal to 160mm.

6. The multistage feed pump according to claim 5, characterized in that the impellers (7) are multistage impellers (7), the multistage impellers (7) are arranged at equal intervals, and the multistage impellers (7) are detachably connected with the pump shaft (5).

7. The multistage feed pump according to claim 6, further comprising a guide vane (8) and a middle section (12), the middle section (12) being arranged radially outside the multistage impellers (7), the guide vane (8) being arranged between two adjacent impellers (7), the guide vane (8) being a multistage guide vane (8).

8. Multistage feed pump according to claim 1, characterized in that the multistage feed pump material is martensitic stainless steel and the seal (4) is an O-ring.

9. An ammonia plant comprising a multistage feed pump according to any one of claims 1 to 8.