WO2016058452A1 - 一种离心泵和轴流泵的轴封辅助冲洗系统 - Google Patents

一种离心泵和轴流泵的轴封辅助冲洗系统 Download PDF

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Publication number
WO2016058452A1
WO2016058452A1 PCT/CN2015/088224 CN2015088224W WO2016058452A1 WO 2016058452 A1 WO2016058452 A1 WO 2016058452A1 CN 2015088224 W CN2015088224 W CN 2015088224W WO 2016058452 A1 WO2016058452 A1 WO 2016058452A1
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pump
outlet pipe
flushing
shaft seal
outlet
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PCT/CN2015/088224
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English (en)
French (fr)
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邢宇
邢天宜
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邢宇
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Priority to US15/519,299 priority Critical patent/US20170234332A1/en
Publication of WO2016058452A1 publication Critical patent/WO2016058452A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning

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  • the invention relates to a shaft seal flushing system for a pump.
  • it relates to a shaft seal auxiliary flushing system for a centrifugal pump and an axial flow pump.
  • the continuous operation life is not less than 25000 hours under the condition that the pressure in the seal chamber is not higher than the pressure value set by the pressure switch [gauge pressure ⁇ 0.7 bar (10 psi)]; , running at least 8 hours in a row;
  • the inlets 21/22 and outlets 23/24 of the working fluids of the two pumps Parallel installation with pipelines, one of the centrifugal pumps is always running during operation, the other is parked and standby, the centrifugal pump 1 is operated as the main pump, and the pump of the centrifugal pump is kept in good condition and is ready for standby, in case the centrifugal pump 1 Pumping out the problem, immediately switch the centrifugal pump 2 pump to become the main pump operation, stop the operation of the centrifugal pump 1 pump immediately repair, after the repair, the centrifugal pump 1 pump becomes the standby pump to stop running, and always in good condition. Let the centrifugal pump 2 pump run continuously as the main pump to complete the process task of this small process. Centrifugal pump 1 and centrifugal pump 2 are installed in each small process in the entire process. The switching between them ensures that the entire process is run continuously at all times.
  • the backup pump In order to keep the material in the spare pump casing of the park at a liquid state, the backup pump should be insulated and heat-treated. Taking such measures for a long time, the stationary surface in the pump casing will adhere to a coking layer, and the longer the pump is stopped, the thicker the coking layer is, even the carbonization and deterioration, its properties are completely different from the actual material properties, regardless of How high the preheating temperature is, it cannot be returned to the liquid state and the mechanical seal moving ring is glued to the static ring. In this case, the standby pump is activated to cause it to run suddenly, and the risk of the mechanical seal being damaged is considerable.
  • the material conveyed by the pump may contain suspended particles, catalysts or other foreign matter particles. When the materials flow, they are suspended particles. When the materials stop flowing, they are precipitated by gravity. The sediment layer becomes thicker and thicker, gradually hardens, blocks the spring of the mechanical seal, and the moving ring and static ring that hold the mechanical seal. Even the mechanical ring and the static ring of the mechanical seal are bonded together. In this case, the standby pump is activated to cause it to run suddenly, and the risk of damage to the mechanical seal is considerable.
  • the best method is to have the performance parameters of the material in the sealed chamber of the backup pump the same as the performance parameters of the material in the main pump seal chamber.
  • the technical problem to be solved by the present invention is to provide a shaft of a centrifugal pump and an axial flow pump capable of flushing a sealed chamber of an unoperated backup pump while the working main running pump flushes its sealed chamber. Seal the auxiliary flushing system.
  • the technical solution adopted by the invention is: a shaft seal auxiliary flushing system of a centrifugal pump and an axial flow pump, comprising a main running pump and a standby pump respectively provided with the same shaft sealing flushing system, the shaft seal of the main running pump
  • the shaft seal flushing system of the flushing system and the backup pump are connected in parallel to each other to form a common shaft seal flushing system that communicates with each other.
  • the common shaft seal flushing system includes: flushing water from a first outlet pipe connected to a water outlet of the main running pump And a first switching valve disposed on the first outlet pipe for controlling the flushing water outflow, a second outlet pipe connected to the outlet of the standby pump, and a second outlet pipe disposed on the second outlet pipe for controlling the flushing water outflow a second switching valve, a first liquid guiding tube connected to the water outlets of the first outlet pipe and the second outlet pipe, wherein the water outlet of the first liquid guiding pipe is respectively connected to the sealing of the main running pump through the third outlet pipe
  • the flushing water inlet on the gland and the flushing water inlet on the gland of the backup pump through the fourth outlet pipe.
  • the first catheter is provided with a strainer or an orifice plate.
  • the first catheter is provided with a strainer and an orifice plate.
  • the first liquid guiding tube is further provided with a first heat exchanger and a first temperature indicator.
  • the shared flushing system includes: a first outlet pipe connected to the water outlet of the main running pump; and a first switching valve disposed on the first outlet pipe for controlling the flushing water to flow out, connected to the outlet of the standby pump a second outlet pipe on the nozzle and a second switching valve disposed on the second outlet pipe for controlling the outflow of the flushing water, and a hydrocyclone connected to the outlet of the first outlet pipe and the second outlet pipe, connected a second liquid guiding tube on the water purifying water outlet of the hydrocyclone and a third liquid guiding tube connected to the sewage separator water outlet, wherein the second liquid guiding tube is out
  • the water outlet is connected to the flushing water inlet disposed on the sealing gland of the main running pump through the fifth outlet pipe, and the flushing water inlet on the sealing gland of the standby pump is connected through the sixth outlet pipe, the third liquid guiding tube Connecting the water inlet end of the main running pump through the seventh outlet pipe and the third switching valve disposed on the seventh outlet pipe, and connecting the standby pump
  • the second catheter is provided with a second heat exchanger and a second temperature indicator.
  • the shaft seal auxiliary flushing system of the centrifugal pump and the axial flow pump of the present invention can be used to keep the fluid material parameters in the sealed chambers of the main and standby pumps at the same time. It not only reduces the risk of seal leakage when the standby pump is started or stopped, but also achieves the 1.3 sealing performance requirement in the API682 standard.
  • FIG. 1 is a schematic view showing the overall structure of a centrifugal pump or an axial flow pump shaft seal flushing system of a first example of the prior art
  • FIG. 2 is a schematic view showing the overall structure of a centrifugal pump or an axial flow pump shaft seal flushing system of a second example of the prior art
  • Figure 3 is a schematic view showing the overall structure of a centrifugal pump or an axial flow pump shaft seal flushing system of a first example of the present invention
  • FIG. 4 is a schematic view showing the overall structure of a centrifugal pump or an axial flow pump shaft seal flushing system of a second example of the present invention.
  • first switch valve 4 second switch valve
  • Second heat exchanger 12-2 Second temperature indicator
  • the shaft seal auxiliary flushing system of the centrifugal pump and the axial flow pump of the present invention is realized on the basis of the prior art as shown in FIG. 1 and FIG. 2, and is a main running pump and a standby pump of the prior art.
  • the washing system is implemented in parallel.
  • the shaft seal auxiliary flushing system of the centrifugal pump and the axial flow pump of the present invention includes: a main running pump 1 and a standby pump 2 respectively provided with the same shaft sealing flushing system,
  • the shaft seal flushing system of the main operation pump 1 and the shaft seal flushing system of the backup pump 2 are connected in parallel to each other to form a common shaft seal flushing system that communicates with each other.
  • a bypass line is taken from the auxiliary system pipeline of the high-pressure water outlet 23 of the main running pump 1 that is running, and this bypass is bypassed.
  • the pipeline is connected to the flushing water inlet on the sealing gland 11 of the standby pump 2 which is not currently involved in operation, so that the sealed flushing system is sealed while the main running pump 1 of the flushing operation is being sealed, and the flushing is not currently involved.
  • the seal of the standby pump 2 is operated. Since then, this spare pump that has not been involved in the operation is always in good condition, there is no risk of sealing leakage when starting the standby pump, and at the same time, the commitment to the continuous operation life of the seal is not less than 25,000 hours. step.
  • the shaft seal auxiliary flushing system of the centrifugal pump and the axial flow pump of the present invention when the working fluid flowing in the main running pump 1 is a pure working fluid, the common shaft seal flushing system is as shown in FIG.
  • the first outlet pipe 5 connected to the water outlet 23 of the main operation pump 1 and the first switch valve 3 disposed on the first outlet pipe 5 for controlling the outflow of the flushing water are connected to the backup pump 2 a second outlet pipe 6 on the flushing water outlet 24 and a second switching valve 4 disposed on the second outlet pipe 6 for controlling the outflow of the flushing water are connected to the outlet of the first outlet pipe 5 and the second outlet pipe 6 a first liquid guiding tube 7 on the nozzle, the water outlet of the first liquid guiding tube 7 is connected to the flushing water inlet on the sealing gland 10 of the main running pump 1 through the third outlet pipe 8, respectively, and through the fourth outlet
  • the water pipe 9 is connected to the flush water inlet on the sealing gland 11 of the backup pump 2.
  • the first liquid guiding tube 7 is provided with orifice plates 7-2 for controlling them.
  • a strainer 7-1 may also be provided in the first catheter 7 if it contains a small amount and is a large particle size of suspended particles.
  • the first catheter 7 is provided with a strainer 7-1 and an orifice plate 7-2 at the same time.
  • a first heat exchanger 7-3 and a first temperature indicator 7-4 may be provided.
  • the working process of the shaft seal auxiliary flushing system of the centrifugal pump and the axial flow pump of the present invention is as follows: when the main running pump 1 is working, the first switching valve 3 is opened, the second switching valve 4 is closed, and the flushing liquid is driven by the main running pump.
  • the water outlet 23 of 1 flows out through the first outlet pipe 5, the first switching valve 3, the first liquid guiding pipe 7 and the third water outlet pipe 8 into the flushing water inlet of the sealing gland 10 of the main running pump 1, and the fluid enters.
  • the mechanical seal chamber close to the end face of the friction pair, flushes the end face of the friction pair, and then passes through the mechanical seal and then enters the main running pump 1.
  • the rinsing liquid is sequentially passed through the first outlet pipe 5, the first switching valve 3, the first liquid guiding tube 7 and the fourth outlet pipe 9 through the water outlet 23 of the main running pump 1 into the sealing gland 11 of the standby pump 2.
  • the water inlet is flushed, the fluid enters the mechanical seal chamber, approaches the end face of the friction pair, flushes the end face of the friction pair, and then passes through the mechanical seal and enters the backup pump 2.
  • the main operation pump 1 and the backup pump 2 can be used interchangeably, that is, the backup pump 2 is used as the main operation pump, and the main operation pump 1 is used as the backup pump, and the operation process is as above.
  • the common shaft sealing flushing system 4 comprising: a first outlet pipe 5 connected to the water outlet 23 of the main operation pump 1 and a first switching valve 3 provided on the first outlet pipe 5 for controlling the outflow of the flushing water, connected a second outlet pipe 6 on the flush water outlet of the backup pump 2 and a second switch valve 4 disposed on the second outlet pipe 6 for controlling the flushing water outflow, connected to the first outlet pipe 5 and the second outlet pipe a hydrocyclone 13 on the water outlet of the 6 , a second liquid conduit 12 connected to the water outlet of the hydrocyclone 13 and a third liquid connected to the sewage outlet of the hydrocyclone 13 a liquid guiding tube 14, wherein the water outlet of the second liquid guiding tube 12 is respectively passed
  • the fifth outlet pipe 19 is connected to the flushing water inlet provided on the sealing gland 10 of the main running pump 1, and the flush
  • the working process of the shaft seal auxiliary flushing system of the centrifugal pump and the axial flow pump of the present invention is as follows: when the main running pump 1 is in operation, the first switching valve 3 and the third switching valve 16 are opened, and the second switching valve 4 is closed.
  • the fourth switch valve 18, the flushing liquid is from the water outlet 23 of the main running pump 1, and sequentially enters the hydrocyclone 13 through the first outlet pipe 5 and the first switching valve 3, and is separated by the hydrocyclone 13, and separated.
  • the clean water enters the flushing water inlet on the sealing gland 10 of the main running pump 1 through the second liquid guiding tube 12 and the fifth water outlet tube 19 in sequence, and the fluid enters the mechanical sealing chamber, approaches the end surface of the friction pair, rinses the end surface of the friction pair, and then rinses the end surface of the friction pair, and then The mechanical seal is passed over and then into the main operating pump 1.
  • the separated clean water enters the flushing water inlet on the sealing gland 11 of the standby pump 2 through the second liquid guiding tube 12 and the sixth outlet water pipe 20 in sequence, and the fluid enters the mechanical sealing chamber, approaches the end surface of the friction pair, and rinses the friction pair.
  • the end face then passes over the mechanical seal and enters the backup pump 2.
  • the separated dirty water containing a large amount of large specific gravity particles flows back to the water inlet 21 end of the main operation pump 1 through the third liquid guiding tube 14.
  • the main operation pump 1 and the backup pump 2 can be used interchangeably, that is, the backup pump 2 is used as the main operation pump, and the main operation pump 1 is used as the backup pump, and the operation process is as above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

一种离心泵和轴流泵的轴封辅助冲洗系统，有分别设置有相同轴封冲洗系统的主运行泵（1）和备用泵（2），主运行泵（1）的轴封冲洗系统和备用泵（2）的轴封冲洗系统相互并联连接构成相互连通的共用轴封冲洗系统。共用轴封冲洗系统是：连接在主运行泵（1）的出水口（23）上的第一出水管（5）和设置在第一出水管（5）上的用于控制冲洗水流出的第一开关阀门（3），连接在备用泵（2）的出水口（24）上的第二出水管（6）和设置在第二出水管（6）上的用于控制冲洗水流出的第二开关阀门（4），连接在第一出水管（5）和第二出水管（6）的出水口上的第一导液管（7），第一导液管（7）的出水口分别通过第三出水管（8）连接主运行泵（1）的密封压盖（10）上的冲洗水入口，以及通过第四出水管（9）连接备用泵（2）的密封压盖（11）上的冲洗水入口，通过该冲洗系统能时刻保持主、备泵密封腔里的流体物料参数相同。

Description

一种离心泵和轴流泵的轴封辅助冲洗系统 技术领域
本发明涉及一种泵的轴封冲洗系统。特别是涉及一种离心泵和轴流泵的轴封辅助冲洗系统。
背景技术
化工流程的离心泵在炼油和化工设备领域里扮演着极其重要的角色，如何延长机械密封的使用寿命是我们当今研究的重要课题，根据API682附录D(标准性附录)标准冲洗方案和辅助金属构件中的1.3密封性能要求中要求符合本标准的密封应达到下列性能：
(1)所有密封连续运行寿命不低于25000小时；
(2)抑制密封在抑制密封腔的压力不高于压力开关设定的泄漏压力值【表压≤0.7bar(10psi)】的条件下，连续运行寿命不低于25000小时；在主密封失效时，至少连续运行8小时；
(3)按美国环境署方法21测量，所有密封泄漏量都应控制在1000ml/m3(1000ppm vol)以内，或者满足用户当地颁布的更严标准，同时密封连续运行寿命不低于25000小时。
但是在实际操作的过程中往往达不到这样的性能要求，影响密封连续运行寿命的原因很多，下面我们就重点阐述影响密封连续运行寿命一个极其重要的原因。
每个炼油和化工的整个庞大工艺流程是由很多个小的、相对独立的工艺环节所组成，完成某一个小的工艺环节都离不开离心泵这个重要设备。如果其中一个小的工艺环节出了问题就会影响整个庞大工艺流程。为了保证设备运行安全，我们通常的做法是在每一个小的工艺环节所需要离心泵的位置上配置1和2两台泵，这两台泵的工作液的进口21/22和出口23/24用管线并联安装，在运行过程中总是其中一台离心泵运行，另一台停着备用，离心泵1作为主力泵运行，离心泵2泵时刻保持完好状态停着备用，万一离心泵1泵出了问题，马上切换离心泵2泵成为主力泵运行，停止运行的离心泵1泵立刻进行修复，修好以后离心泵1泵就变成了备用泵停止运行，并且时刻保持完好状态。让离心泵2泵作为主力泵连续运行去完成这个小的工艺环节的工艺任务。在整个庞大工艺流程中每个小的工艺环节里都配置离心泵1、离心泵2泵，它们来回切换就保证了整个庞大工艺流程每一时刻都不间断地运行。
但是在实际的化工流程里并不是想象的那么简单。当今，炼油和化工领域已经进入到了深加工，并且还向着更深的加工发展，这就意味着化工残留物越来越少，因此工艺参数越来越高，这样同一台泵里所输送的物料介质流动着和静止着两种情况的性质和状态往往差别非常大。运行着的主力泵泵壳里和密封腔里的物料介质是流动的而停着的备用泵泵壳里和密封腔里的物料介质是静止的。造成它们之间差别的原因是：
(1)有的物料在高温时呈液体状态，常温时呈固体状态。流动的物料各处的温度均匀而全部处于液体状态；停止流动的物料各处的温度不可能时时刻刻均匀，所以在备用泵泵壳里和密封腔里的物料部分处于固体状态，甚至于全部都处于固体状态。在这种情况下启动备用泵让其突然运行，这时机械密封被损坏的风险相当大。即便进行预热也无法做到充分，况且 预热需要很长的时间，可能影响生产。
(2)为了让停着的备用泵泵壳里的物料时刻处在液体状态就要对备用泵进行保温和伴热。采取这样的措施时间一长泵壳内的静止表面就会附着一层焦化层，而且停泵的时间越长这个焦化层越厚，甚至碳化变质，它的性质已经与实际物料性质完全不同，无论预热温度有多高它都无法变回到液体状态并且把机械密封动环与静环粘成一体，在这种情况下启动备用泵让其突然运行，机械密封被损坏的风险相当大。
(3)泵所输送的物料里可能含有悬浮颗粒、催化剂或其它的杂物颗粒。物料流动的时候它们是悬浮颗粒，物料停止流动的时候重力使其沉淀，沉淀层越来越厚，逐步变硬，堵住了机械密封的弹簧、把住了机械密封的动环和静环，甚至于将机械密封的动环和静环粘接成了一体。在这种情况下启动备用泵让其突然运行，机械密封被损坏的风险相当大。
(4)在停止运行的备用泵上由于机械密封、阀门和管线都有可能出现极其微小的渗漏，物料受重力的影响在泵壳和密封腔里的液面会逐渐降低，液面以上的空间就由物料的蒸汽和部分空气这样的气体所填充，把机械密封摩擦副的大部分体积暴露在气体里。空气里含有氧气，物料极有可能是易燃易爆品，在这时启动备用泵让其突然运行，机械密封突然在该气体里而不是在液体里高速旋转，摩擦副产生的摩擦热无法短时间散去，此时燃烧的三个条件就都具备了。轻则马上烧毁机械密封，使得泵很快就漏，必须停泵进行处理，从而影响生产。重则导致着火，给安全生产造成隐患。
(5)由于在长时间停着的备用泵泵壳里和密封腔里的物料沉积在零件与接触物料的那一部分表面，尤其是在机械密封弹性补偿组件上的辅助密封圈以及与它接触的轴的相应位置沉积了一些已经固化甚至于已经碳化了的物料附着在轴与密封圈之间形成了凸缘，阻碍补偿部件的正常工作，跟随能力下降，密封圈每次在轴上微动时都必须跃过这个凸缘，所以它们之间的摩擦力剧增，很快损坏密封圈造成泄漏。
因为存在上述这些原因，在切换主力泵和备用泵时总是伴随着密封泄漏的风险，此时机械密封最容易损坏。最好的方法就是让备用泵密封腔里物料介质的性能参数与正在运行中的主泵密封腔里物料介质的性能参数相同。
在现有技术里尤其是API682附录D(标准性附录)标准冲洗方案和辅助金属构件之中，虽然给出了全面的密封冲洗方案。但其所有的密封冲洗方案都是针对如何保护运行着的主力泵(说明书附图中的离心泵1泵)的冲洗方案。而并没有给出保护停止运行的备用泵2的密封冲洗方案。
发明内容
本发明所要解决的技术问题是，提供一种能够在工作着的主运行泵对自身的密封腔进行冲洗的同时也对未工作的备用泵的密封腔进行冲洗的离心泵和轴流泵的轴封辅助冲洗系统。
本发明所采用的技术方案是：一种离心泵和轴流泵的轴封辅助冲洗系统，包括有分别设置有相同轴封冲洗系统的主运行泵和备用泵，所述主运行泵的轴封冲洗系统和备用泵的轴封冲洗系统相互并联连接构成相互连通的共用轴封冲洗系统。
所述的共用轴封冲洗系统包括有：冲洗水来自连接在主运行泵的出水口上的第一出水管 和设置在第一出水管上的用于控制冲洗水流出的第一开关阀门，连接在备用泵的出水口上的第二出水管和设置在第二出水管上的用于控制冲洗水流出的第二开关阀门，连接在第一出水管和第二出水管的出水口上的第一导液管，所述的第一导液管的出水口分别通过第三出水管连接主运行泵的密封压盖上的冲洗水入口，以及通过第四出水管连接备用泵的密封压盖上的冲洗水入口。
所述的第一导液管上设置有粗滤器或孔板。
所述的第一导液管上设置有粗滤器和孔板。
所述的第一导液管上还设置有第一热交换器和第一温度指示器。
所述的共用冲洗系统包括有：连接在主运行泵的出水口上的第一出水管和设置在第一出水管上的用于控制冲洗水流出的第一开关阀门，连接在备用泵的出水口上的第二出水管和设置在第二出水管上的用于控制冲洗水流出的第二开关阀门，连接在第一出水管和第二出水管的出水口上的旋液分离器，连接在所述旋液分离器净水出水口上的第二导液管和连接在所述旋液分离器污水出水口上的第三导液管，其中，所述的第二导液管的出水口分别通过第五出水管连接设置在主运行泵的密封压盖上的冲洗水入口，以及通过第六出水管连接备用泵的密封压盖上的冲洗水入口，所述的第三导液管分别通过第七出水管和设置在第七出水管上的第三开关阀门连接主运行泵的入水口端，以及通过第八出水管和设置在第八出水管上的第四开关阀门连接备用泵的入水口端。
所述的第二导液管上设置有第二热交换器和第二温度指示器。
本发明的一种离心泵和轴流泵的轴封辅助冲洗系统，具有如下有益效果：
1、让停止运转的备用泵密封腔中的物料时刻处于液体状态，时刻保持主、备泵密封腔里的流体物料参数相同。
2、避免泵壳内的静止零件表面附着一层焦化层或碳化层，从而避免也了机械密封动环与静环粘成一体。
3、避免泵所输送的物料里可能含有悬浮颗粒、催化剂或其它的杂物颗粒。物料流动的时候它们是悬浮颗粒，采用本发明的冲洗就避免了物料因为停止流动的时候重力使其沉淀，沉淀层越来越厚，逐步变硬，堵住了机械密封的弹簧、把住了机械密封的动环和静环，甚至于将机械密封的动环和静环粘接成了一体。
4、避免了在长时间停止运行的备用泵上由于机械密封、阀门和管线都有可能出现极其微小的渗漏，物料介质受重力的影响在泵壳和密封腔里的液面会逐渐降低，液面以上的空间就由物料的蒸汽和部分空气这样的气体所填充，把机械密封摩擦副的大部分体积暴露在气体里。空气里含有氧气，物料介质极有可能是易燃易爆品，在这时启动备用泵让其突然运行，机械密封突然在该气体里而不是在液体里高速旋转，摩擦副产生的摩擦热无法短时间散去，此时燃烧的三个条件就都具备了。轻则马上烧毁机械密封，使得泵很快就漏，必须停泵进行处理，从而影响生产。重则导致着火，采用了本发明就消除了安全生产隐患。
5、避免了由于在长时间停着的备用泵泵壳里和密封腔里的物料沉积在零件暴露并且接触物料的那一部分表面，尤其是在机械密封弹性补偿组件上的辅助密封圈以及与它接触的轴的相应位置沉积了一些已经固化甚至于已经碳化了的物料附着在轴与密封圈之间形成凸缘，阻 碍补偿部件的正常工作，跟随能力下降，密封圈每次在轴上微动时都必须跃过这个凸缘，所以它们之间的摩擦力剧增，很快损坏密封圈造成泄漏，延长了机械密封的使用寿命。
综上所述，采用了本发明一种离心泵和轴流泵的轴封辅助冲洗系统，能时刻保持主、备泵密封腔里的流体物料参数相同。不但降低了备用泵的启、停时密封泄漏的风险，而且还能够实现API682标准里1.3密封性能要求。
附图说明
图1是现有技术的第一实例的离心泵或轴流泵轴封冲洗系统的整体结构示意图；
图2是现有技术的第二实例的离心泵或轴流泵轴封冲洗系统的整体结构示意图；
图3是本发明的第一实例的离心泵或轴流泵轴封冲洗系统的整体结构示意图；
图4是本发明的第二实例的离心泵或轴流泵轴封冲洗系统的整体结构示意图。
图中
1：主运行泵          2：备用泵
3：第一开关阀门      4：第二开关阀门
5：第一出水管        6：第二出水管
7：第一导液管        7-1：粗滤器
7-2：孔板            7-3：第一热交换器
7-4：第一温度指示器  8：第三出水管
9：第四出水管        10：密封压盖
11：密封压盖         12：第二导液管
12-1：第二热交换器   12-2：第二温度指示器
13：旋液分离器       14：第三导液管
15：第七出水管       16：第三开关阀门
17：第八出水管       18：第四开关阀门
19：第五出水管       20：第六出水管
21：入水口           22：入水口
23：出水口           24：出水口
25：泵轴             26：泵轴
具体实施方式
下面结合实施例和附图对本发明的一种离心泵和轴流泵的轴封辅助冲洗系统做出详细说明。
本发明的一种离心泵和轴流泵的轴封辅助冲洗系统，是在如图1、图2所示的现有技术的基础上实现的，是将现有技术的主运行泵和备用泵的洗系统相并联来实现的。本发明的一种离心泵和轴流泵的轴封辅助冲洗系统，具体如图3、图4所示，包括有：分别设置有相同轴封冲洗系统的主运行泵1和备用泵2，所述主运行泵1的轴封冲洗系统和备用泵2的轴封冲洗系统相互并联连接构成相互连通的共用轴封冲洗系统。即，在API682附录D(标准性附 录)标准冲洗方案和辅助金属构件之中，根据原有的标准密封冲洗方案，利用正在运行着的主运行泵1的高压出水口23的辅助系统管线接出一个旁路管线，将这个旁路管线与当前还没有参与运行的备用泵2的密封压盖11上的冲洗水入口相应位置连接，让这个密封冲洗系统在冲洗运行着的主运行泵1密封的同时，也冲洗着当前还没有参与运行的备用泵2的密封。从此以后这个当前还没有参与运行的备用泵时时刻刻都处于完好状态，不存在任何启动备用泵时密封泄漏的风险，与此同时向着密封连续运行寿命不低于25000小时这个承诺迈进了一大步。
本发明的一种离心泵和轴流泵的轴封辅助冲洗系统，当所述的主运行泵1中所流动工作液为纯净工作液时，所述的共用轴封冲洗系统如图3所示，包括有：连接在主运行泵1的出水口23上的第一出水管5和设置在第一出水管5上的用于控制冲洗水流出的第一开关阀门3，连接在备用泵2的冲洗水出水口24上的第二出水管6和设置在第二出水管6上的用于控制冲洗水流出的第二开关阀门4，连接在第一出水管5和第二出水管6的出水口上的第一导液管7，所述的第一导液管7的出水口分别通过第三出水管8连接主运行泵1的密封压盖10上的冲洗水入口，以及通过第四出水管9连接备用泵2的密封压盖11上的冲洗水入口。
当主运行泵1和备用泵2中的出口23、24压力与入口21、22压力之差超过0.3MPa时，所述的第一导液管7上设置有孔板7-2，用于控制它们之间的压力差。在所述的第一导液管7中如果含有少量并且是大粒度的悬浮颗粒时还可以设置有粗滤器7-1。
或者是，所述的第一导液管7上同时设置有粗滤器7-1和孔板7-2。
当所述的第一导液管7中需要控制冲洗液的温度时还可以设置有第一热交换器7-3和第一温度指示器7-4。
上述本发明的一种离心泵和轴流泵的轴封辅助冲洗系统的工作过程是：当主运行泵1工作时，打开第一开关阀门3，关闭第二开关阀门4，冲洗液由主运行泵1的出水口23流出依次经过第一出水管5、第一开关阀门3、第一导液管7和第三出水管8进入主运行泵1的密封压盖10上的冲洗水入口，流体进入机械密封腔，接近摩擦副端面，冲洗该摩擦副端面，然后越过机械密封再进入主运行泵1中。同时，冲洗液由主运行泵1的出水口23依次经过第一出水管5、第一开关阀门3、第一导液管7和第四出水管9进入备用泵2的密封压盖11上的冲洗水入口，流体进入机械密封腔，接近摩擦副端面，冲洗该摩擦副端面，然后越过机械密封再进入备用泵2中。
在上述运行的过程中，主运行泵1和备用泵2可以互换使用，即备用泵2用作主运行泵，而主运行泵1作为备用泵，其工作过程如上。
本发明的一种离心泵和轴流泵的轴封辅助冲洗系统，当所述的主运行泵1中所流动工作物料液体中含有大比重的悬浮颗粒时，所述的共用轴封冲洗系统如图4所示，包括有：连接在主运行泵1的出水口23上的第一出水管5和设置在第一出水管5上的用于控制冲洗水流出的第一开关阀门3，连接在备用泵2的冲洗水出水口上的第二出水管6和设置在第二出水管6上的用于控制冲洗水流出的第二开关阀门4，连接在第一出水管5和第二出水管6的出水口上的旋液分离器13，连接在所述旋液分离器13净水出水口上的第二导液管12和连接在所述旋液分离器13污水出水口上的第三导液管14，其中，所述的第二导液管12的出水口分别通 过第五出水管19连接设置在主运行泵1的密封压盖10上的冲洗水入口，以及通过第六出水管20连接备用泵2的密封压盖11上的冲洗水入口，所述的第三导液管14分别通过第七出水管15和设置在第七出水管15上的第三开关阀门16连接主运行泵1的入水口21端，以及通过第八出水管17和设置在第八出水管17上的第四开关阀门18连接备用泵2的入水口22端。所述的第二导液管12中需要控制冲洗液的温度时，还可以设置有第二热交换器12-1和第二温度指示器12-2。
上述本发明的一种离心泵和轴流泵的轴封辅助冲洗系统的工作过程是：当主运行泵1工作时，打开第一开关阀门3和第三开关阀门16，关闭第二开关阀门4和第四开关阀门18，冲洗液来自主运行泵1的出水口23，并且依次经过第一出水管5和第一开关阀门3进入旋液分离器13，经旋液分离器13进行分离，分离后的清水依次经第二导液管12和第五出水管19进入主运行泵1的密封压盖10上的冲洗水入口，流体进入机械密封腔，接近摩擦副端面，冲洗该摩擦副端面，然后越过机械密封再进入主运行泵1中。同时，分离后的清水依次经第二导液管12和第六出水管20进入备用泵2的密封压盖11上的冲洗水入口，流体进入机械密封腔，接近摩擦副端面，冲洗该摩擦副端面，然后越过机械密封再进入备用泵2中。分离后的含有大量大比重颗粒的脏水经第三导液管14后流回到主运行泵1的入水口21端。
在上述运行的过程中，主运行泵1和备用泵2可以互换使用，即备用泵2用作主运行泵，而主运行泵1作为备用泵，其工作过程如上。

Claims (7)

  1. 一种离心泵和轴流泵的轴封辅助冲洗系统，包括有分别设置有相同轴封冲洗系统的主运行泵(1)和备用泵(2)，其特征在于，所述主运行泵(1)的轴封冲洗系统和备用泵(2)的轴封冲洗系统相互并联连接构成相互连通的共用轴封冲洗系统。
  2. 根据权利要求1所述的一种离心泵和轴流泵的轴封辅助冲洗系统，其特征在于，所述的共用轴封冲洗系统包括有：冲洗水来自连接在主运行泵(1)的出水口(23)上的第一出水管(5)和设置在第一出水管(5)上的用于控制冲洗水流出的第一开关阀门(3)，连接在备用泵(2)的出水口(24)上的第二出水管(6)和设置在第二出水管(6)上的用于控制冲洗水流出的第二开关阀门(4)，连接在第一出水管(5)和第二出水管(6)的出水口上的第一导液管(7)，所述的第一导液管(7)的出水口分别通过第三出水管(8)连接主运行泵(1)的密封压盖(10)上的冲洗水入口，以及通过第四出水管(9)连接备用泵(2)的密封压盖(11)上的冲洗水入口。
  3. 根据权利要求2所述的一种离心泵和轴流泵的轴封辅助冲洗系统，其特征在于，所述的第一导液管(7)上设置有粗滤器(7-1)或孔板(7-2)。
  4. 根据权利要求2或3所述的一种离心泵和轴流泵的轴封辅助冲洗系统，其特征在于，所述的第一导液管(7)上设置有粗滤器(7-1)和孔板(7-2)。
  5. 根据权利要求2或3所述的一种离心泵和轴流泵的轴封辅助冲洗系统，其特征在于，所述的第一导液管(7)上还设置有第一热交换器(7-3)和第一温度指示器(7-4)。
  6. 根据权利要求1所述的一种离心泵和轴流泵的轴封辅助冲洗系统，其特征在于，所述的共用冲洗系统包括有：连接在主运行泵(1)的出水口(23)上的第一出水管(5)和设置在第一出水管(5)上的用于控制冲洗水流出的第一开关阀门(3)，连接在备用泵(2)的出水口(24)上的第二出水管(6)和设置在第二出水管(6)上的用于控制冲洗水流出的第二开关阀门(4)，连接在第一出水管(5)和第二出水管(6)的出水口上的旋液分离器(13)，连接在所述旋液分离器(13)净水出水口上的第二导液管(12)和连接在所述旋液分离器(13)污水出水口上的第三导液管(14)，其中，所述的第二导液管(12)的出水口分别通过第五出水管(19)连接设置在主运行泵(1)的密封压盖(10)上的冲洗水入口，以及通过第六出水管(20)连接备用泵(2)的密封压盖(11)上的冲洗水入口，所述的第三导液管(14)分别通过第七出水管(15)和设置在第七出水管(15)上的第三开关阀门(16)连接主运行泵(1)的入水口端(21)，以及通过第八出水管(17)和设置在第八出水管(17)上的第四开关阀门(18)连接备用泵(2)的入水口端(22)。
  7. 根据权利要求6所述的一种离心泵和轴流泵的轴封辅助冲洗系统，其特征在于，所述的第二导液管(12)上设置有第二热交换器(12-1)和第二温度指示器(12-2)。
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