WO2022213482A1 - 一种深井泵 - Google Patents

一种深井泵 Download PDF

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Publication number
WO2022213482A1
WO2022213482A1 PCT/CN2021/101107 CN2021101107W WO2022213482A1 WO 2022213482 A1 WO2022213482 A1 WO 2022213482A1 CN 2021101107 W CN2021101107 W CN 2021101107W WO 2022213482 A1 WO2022213482 A1 WO 2022213482A1
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Prior art keywords
pump
sleeve
wall
deep well
casing
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PCT/CN2021/101107
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English (en)
French (fr)
Inventor
刘伟
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台州佳迪泵业有限公司
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Publication of WO2022213482A1 publication Critical patent/WO2022213482A1/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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes
    • 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
    • F04D29/08—Sealings
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps

Definitions

  • the utility model belongs to the technical field of water pumps, in particular to a deep well pump.
  • the deep well pump is a kind of pump that enters the low water well for pumping and conveying water. It is widely used in farmland irrigation and drainage, industrial and mining enterprises, urban water supply and drainage, and misunderstanding treatment. Since the electric motor dives into the water at the same time, the structural requirements for the electric motor are more special than those of the general electric motor.
  • the pump casing of the traditional deep well pump is provided with a plastic casing. Due to the installation requirements, there is a gas ring cavity of a certain thickness between the plastic casing and the pump body.
  • the pressure of the water inlet is small and the water outlet. The higher the pressure, the greater the loss of the pressure difference to the plastic casing, and the greater the pressure difference generated by the higher the lift, the more easily the casing of the deep well pump is damaged, resulting in a shorter service life.
  • the purpose of the present utility model is to provide a solution to the above problems, and to provide a deep well pump, which can reduce the pressure difference existing between the pump body and the plastic casing, and ensure the advantages of the deep well pump's service life and the like.
  • a deep well pump comprises a casing, a pump shaft is arranged in the casing, a plurality of pump bodies formed in series are sleeved on the pump shaft, the outer wall of the pump body and the inner wall of the casing form an annular cavity, and the pump shaft is provided with a ring cavity.
  • the pressure dividing mechanism is sleeved, and the pressure dividing mechanism is arranged between the pump bodies at intervals.
  • the pressure dividing mechanism includes an inner shaft sleeve sleeved on the pump shaft.
  • the outer wall of the inner shaft sleeve is sleeved with an inner cylinder sleeve.
  • a plurality of reinforcing plates are radially extended from the outer side wall of the reinforcing plate, the outer end of the reinforcing plate is formed with an outer sleeve that is abutted against the inner wall of the casing, and a plurality of guiding cavities are formed between the reinforcing plates.
  • the utility model is further provided that the outer wall of the outer cylinder sleeve is provided with a ring groove, and an O-shaped sealing ring is clamped and connected in the ring groove.
  • the utility model is further provided that the lower end of the outer cylinder sleeve is formed with an annular clamping ring, and the upper end of the pump body is formed with a clamping ring groove matching with the clamping ring.
  • the pump body includes an impeller sleeve fixed on the pump shaft, the outer wall of the impeller sleeve radially extends with several impellers, the lower end of the impeller sleeve is fixed with a lower cover plate with a through hole, the lower cover A guide casing is fixedly connected to the outside of the plate, an impeller cavity for placing the impeller is formed between the guide casing and the lower cover plate, and the upper end of the guide casing is provided with the snap ring groove.
  • the utility model is further provided that the upper end of the outer sleeve is formed with a cover plate ring groove for the lower cover plates to abut against.
  • the utility model is further provided that the upper end of the pump body is provided with a water outlet valve seat, the water outlet is imitated to abut against the upper end of the guide shell, the lower end of the pump body is provided with a water inlet bracket, and the upper end of the bracket is in contact with the lower end of the water inlet bracket.
  • the edges of the cover plates touch each other.
  • the utility model utilizes the addition of a pressure dividing mechanism between the pump bodies of the deep well pumps connected in series, so that the pressure in the annular cavity is decomposed step by step, reducing the pressure difference between the upper and lower ends of the annular cavity, and preventing the casing from being damaged under a higher lift state. phenomenon, to ensure the service life of the deep well pump.
  • the outer wall of the outer sleeve of the present invention is further provided with a ring groove capable of installing an O-type sealing ring.
  • the addition of the sealing ring allows the outer sleeve to seal the ring cavity by grading. pressure difference at the end.
  • the matching snap ring groove and snap ring provided by the present utility model can increase the contact area of the pump body and the pressure dividing mechanism, and the improved contact area can enhance a certain tightness.
  • the pump body is installed step by step in the present invention, which not only facilitates installation, but also provides convenience for the maintenance process.
  • the outlet valve seat and the bracket of the present invention can fasten and seal the upper and lower ends of the pump body to ensure the normal operation of the impeller in the pump body.
  • Fig. 1 is the sectional schematic diagram of the present utility model
  • Fig. 2 is the enlarged schematic diagram of part A of the present utility model
  • Fig. 3 is the enlarged schematic diagram of part B of the present utility model
  • 3- pump body 30- ring cavity; 31- snap ring groove; 32- impeller sleeve; 33- lower cover plate; 330- impeller cavity; 34- guide casing; 35- impeller
  • a deep well pump includes a casing 1, a pump shaft 2 is arranged in the casing 1, and a plurality of pump bodies 3 connected in series are sleeved on the pump shaft 2, and the outer wall of the pump body 3 and the inner wall of the casing 1 form The annular cavity 30 , a pressure dividing mechanism 4 is sleeved on the pump shaft 2 , the pressure dividing mechanism 4 is arranged between the pump bodies 3 at intervals, and the pressure dividing mechanism 4 includes an inner shaft sleeve 40 sleeved on the pump shaft 2 .
  • the outer wall of the inner shaft sleeve 40 is provided with an inner cylinder sleeve 41, the outer side wall of the inner cylinder sleeve 41 radially extends with a number of reinforcing plates 42, and the outer end of the reinforcing plate 42 is formed with an outer sleeve 43 against the inner wall of the casing.
  • a plurality of guide cavities 44 are formed between the reinforcing plates 42 .
  • the pump body Since the pump body is connected in series, the pump body is sleeved on the pump shaft 2 step by step. The outer sleeve in the middle will abut against the inner wall of the casing, so that the annular cavity 30 is divided into two shorter cylindrical structures from a long cylindrical structure, which plays a role of partial pressure and makes the deep well pump in the process. The resulting pressure difference in the housing is reduced.
  • the annular cavity 30 can be formed into a plurality of shorter cylindrical structures, that is, the partial pressure effect is more obvious, and the multiple partial pressure
  • the design of the mechanism 4 can provide a higher head for the deep well pump, which makes it more efficient and has a longer life.
  • annular groove 45 is formed on the outer wall of the outer sleeve 43 , and an O-ring 450 is clamped in the annular groove 45 .
  • the outer sleeve 43 is attached to the inner wall of the casing 1 to achieve a theoretical partial pressure on the annular cavity 30, but there is a high requirement for the machining accuracy of the parts, so the outer sleeve 43 and the shell There is a certain gap in the inner wall, and the O-ring is used to achieve the sealing effect, which is easy to install while ensuring the sealing and reducing the processing requirements.
  • an annular snap ring 46 is formed on the lower end of the outer sleeve 43
  • a snap ring groove 31 is formed on the upper end of the pump body 3 , which is matched with the snap ring 46 .
  • the matching snap ring groove 31 and snap ring 46 can closely fit the upper end of the pump body 3 and the lower end of the outer sleeve 43 to ensure sealing and prevent water in the pump body from flowing into the ring cavity 30 .
  • the pump body 3 includes an impeller sleeve 32 fixed on the pump shaft 2 , a plurality of impellers 35 radially extend from the outer wall of the impeller sleeve 32 , and a lower cover plate 33 with a through hole is fixed at the lower end of the impeller sleeve 32
  • a guide casing 34 is fixedly connected to the outer side of the lower cover plate 33, an impeller cavity 330 for placing the impeller 35 is formed between the guide casing 34 and the lower cover plate 33, and the snap ring groove 31 is opened in the guide casing 34 the upper end of .
  • the upper end of the outer sleeve 43 is formed with a cover plate ring groove 430 for the lower cover plate 33 to abut against.
  • the sealing between the upper end of the outer sleeve 43 and the lower end of the pump body 3 , that is, the lower cover plate 33 is also enhanced to allow the liquid in the impeller cavity 330 to enter the annular cavity 30 .
  • the upper end of the pump body 3 is provided with a water outlet valve seat 5, and the water outlet valve seat 5 is in contact with the upper end of the guide shell 34, and the lower end of the pump body 3 is provided with a water inlet bracket 6. The upper end is in contact with the edge of the lower cover plate 33 .
  • the deep well pump provided by the utility model utilizes a pressure dividing mechanism arranged between the pump bodies arranged in series to perform partial pressure treatment on the annular cavity formed by the outer wall of the pump and the inner wall of the casing, so that the deep well pump can be operated in a high-lift working state and In the case of high flow rate, the pressure difference between the top and bottom of the ring cavity is reduced to ensure the service life of the casing and the work efficiency is higher.

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

Abstract

一种深井泵包括壳体（1），壳体（1）内设置有泵轴（2），泵轴（2）上套设有若干串联而成的泵体（3）。泵体（3）的外壁与壳体（1）的内壁形成环腔（30），泵轴（2）上套设有分压机构（4），分压机构（4）间隔设置在泵体（3）之间。分压机构（4）包括套设于泵轴（2）上的内轴套（40），内轴套（40）的外壁套设有内筒套（41），内筒套（41）的外侧壁径向延伸有若干加强板（42），加强板（42）外端成型有与壳体内壁相抵的外筒套（43），加强板（42）之间形成若干导流腔（44）。该深井泵的壳体不易损坏、使用寿命长。

Description

一种深井泵 技术领域
本实用新型属于水泵技术领域，特指一种深井泵。
背景技术
目前，深井泵是进入低下水井中进行抽吸和输送水的一种泵，被广泛应用于农田排灌、工矿企业、城市给排水和误会处理等。由于电动机同时潜入水中，故对于电动机的结构要求比一般电动机特殊。
传统的深井泵的泵体外套设有塑料外壳，由于安装需求，塑料外壳与泵体之间存在一定厚度的气体环腔，而在深井泵工作状态下时，导致进水口压力较小，出水口处压力较大，所产生的压力差对于塑料外壳有着较大的损耗，并且扬程越高所产生的压力差就越大，深井泵的外壳也就越容易损坏，导致使用寿命较短。
发明内容
本实用新型的目的是提供一种解决上述问题，而提供一种深井泵，其能够减小泵体与塑料壳体之间所存在的压力差，保障深井泵使用寿命等优点。
本实用新型的目的是这样实现的：
一种深井泵，包括壳体，壳体内设置有泵轴，泵轴上套设有若干串联而成的泵体，所述泵体的外壁与壳体的内壁形成环腔，所述泵轴上套设有分压机构，分压机构间隔设置在泵体之间，所述分压机构包括套设于泵轴上的内轴套，内轴套的外壁套设有内筒套，内筒套的外侧壁径向延伸有若干加强板，加强板外 端成型有与所述壳体内壁相抵的外筒套，所述加强板之间形成若干导流腔。
本实用新型进一步设置为，所述外筒套的外壁开设有环槽，环槽内卡接有O型密封圈。
本实用新型进一步设置为，所述外筒套的下端成型有环形的卡接圈，所述泵体的上端成型有与所述卡接圈相适配的卡接环槽。
本实用新型进一步设置为，所述泵体包括固定于泵轴上的叶轮套，叶轮套的外壁径向延伸有若干叶轮，所述叶轮套的下端固定有具有通孔的下盖板，下盖板的外固定连接有导流壳，导流壳与下盖板之间形成用于放置叶轮的叶轮腔，所述导流壳的上端开设有所述卡接环槽。
本实用新型进一步设置为，所述外筒套的上端形成有用于下盖板相抵的盖板环槽。
本实用新型进一步设置为，所述泵体的上端设置有出水阀座，出水仿作与所述导流壳的上端相抵，所述泵体下端设置有进水支架，支架的上端与所述下盖板的边沿相抵。
本实用新型相比现有技术突出且有益的技术效果是：
1、本实用新型利用在深井泵串联连接泵体之间增设分压机构，让环腔内的压力逐级分解，减少环腔上下两端的压力差，防止壳体在较高扬程状态下出现破损现象，保障深井泵的使用寿命。
2、本实用新型的进一步在外筒套的外壁开设有能够安装O型密封圈的环槽，密封圈的增设让外套筒将环腔分级密封效果更明显，减少分压后的环腔上下两端的压力差。
3、本实用新型的所设置的相适配的卡接环槽以及卡接圈能够将泵体以及分 压机构的接触面积进行增大，所提升的接触面积能够增强一定的密封性。
4、本实用新型中泵体逐级安装，不仅能够安装方便，同时对于检修过程也提供便利。
5、本实用新型的出水阀座以及支架能够为泵体的上下端进行紧固与密封，保障泵体内的叶轮正常工作。
附图说明
图1是本实用新型的剖面示意图；
图2是本实用新型局部A的放大示意图；
图3是本实用新型局部B的放大示意图；
附图标记：
1-壳体；
2-泵轴；
3-泵体；30-环腔；31-卡接环槽；32-叶轮套；33-下盖板；330-叶轮腔；34-导流壳；35-叶轮
4-分压机构；40-内轴套；41-内筒套；42-加强板；43-外筒套；430-盖板环槽；44-导流腔；45-环槽；450-O型密封圈；46-卡接圈；
5-出水阀座；6-进水支架。
具体实施方式
下面结合附图以具体实施例对本实用新型作进一步描述，参见图1一图3：
一种深井泵，包括壳体1，壳体1内设置有泵轴2，泵轴2上套设有若干串联而成的泵体3，所述泵体3的外壁与壳体1的内壁形成环腔30，所述泵轴2上套设有分压机构4，分压机构4间隔设置在泵体3之间，所述分压机构4包括 套设于泵轴2上的内轴套40，内轴套40的外壁套设有内筒套41，内筒套41的外侧壁径向延伸有若干加强板42，加强板42外端成型有与所述壳体内壁相抵的外筒套43，所述加强板42之间形成若干导流腔44。
在实际安装过程中，与传统的深井泵安装流程一致，由于是采用串联的泵体，泵体逐级套设于泵轴2上，套设若干后在套入分压机构，分压机构4中的外筒套则会与壳体的内壁相抵，让环腔30由较长的圆筒形结构，分为两个较短的圆筒形结构，起到分压作用，让深井泵在过程中所产生的作用在壳体内的压力差进行缩小。
值得一提的是，以若干个分压机构4套设在泵轴2上，就能将环腔30进行多个更短的圆筒形结构，即分压效果更为明显，多个分压机构4的设计，能够为深井泵提供更高的扬程，让其效率更高，同时寿命更长。
优选的，所述外筒套43的外壁开设有环槽45，环槽45内卡接有O型密封圈450。
实际装配过程中，外套筒43与壳体1的内壁进行贴合实现理论上的将环腔30进行分压，但对于零件的加工精准性有着较高的要求，所以外套筒43与壳体内壁存在一定的缝隙，领用O型密封环实现密封作用，易于安装的同时保障密封性，并减轻加工需求。
优选的，所述外筒套43的下端成型有环形的卡接圈46，所述泵体3的上端成型有与所述卡接圈46相适配的卡接环槽31。相适配的卡接环槽31与卡接圈46能够将泵体3上端与外筒套43下端紧密贴合，保证密封性，防止泵体内的水流入环腔30内。
优选的，所述泵体3包括固定于泵轴2上的叶轮套32，叶轮套32的外壁径 向延伸有若干叶轮35，所述叶轮套32的下端固定有具有通孔的下盖板33，下盖板33的外固定连接有导流壳34，导流壳34与下盖板33之间形成用于放置叶轮35的叶轮腔330，所述卡接环槽31开设于导流壳34的上端。
优选的，所述外筒套43的上端形成有用于下盖板33相抵的盖板环槽430。增强外筒套43上端与泵体3下端即下盖板33之间的密封性，也是为了将叶轮腔330内的液体进入环腔30内。
优选的，所述泵体3的上端设置有出水阀座5，出水阀座5与所述导流壳34的上端相抵，所述泵体3下端设置有进水支架6，进水支架6的上端与所述下盖板33的边沿相抵。
工作原理：
本实用新型所提供的深井泵，利用串联设置的泵体之间设置分压机构，将泵体外壁与壳体内壁所形成的环腔进行分压处理，让深井泵在高扬程工作状态下以及高流速的情况下，环腔上下压力差进行减小，保障壳体的使用寿命，工作效率更高。
上述实施例仅为本实用新型的较佳实施例，并非依此限制本实用新型的保护范围，故：凡依本实用新型的结构、形状、原理所做的等效变化，均应涵盖于本实用新型的保护范围之内。

Claims (6)

  1. 一种深井泵，包括壳体(1)，壳体(1)内设置有泵轴(2)，泵轴(2)上套设有若干串联而成的泵体(3)，其特征在于，所述泵体(3)的外壁与壳体(1)的内壁形成环腔(30)，所述泵轴(2)上套设有分压机构(4)，分压机构(4)间隔设置在泵体(3)之间，所述分压机构(4)包括套设于泵轴(2)上的内轴套(40)，内轴套(40)的外壁套设有内筒套(41)，内筒套(41)的外侧壁径向延伸有若干加强板(42)，加强板(42)外端成型有与所述壳体内壁相抵的外筒套(43)，所述加强板(42)之间形成若干导流腔(44)。
  2. 根据权利要求1所述的一种深井泵，其特征在于，所述外筒套(43)的外壁开设有环槽(45)，环槽(45)内卡接有O型密封圈(450)。
  3. 根据权利要求1或2所述的一种深井泵，其特征在于，所述外筒套(43)的下端成型有环形的卡接圈(46)，所述泵体(3)的上端成型有与所述卡接圈(46)相适配的卡接环槽(31)。
  4. 根据权利要求3所述的一种深井泵，其特征在于，所述泵体(3)包括固定于泵轴(2)上的叶轮套(32)，叶轮套(32)的外壁径向延伸有若干叶轮(35)，所述叶轮套(32)的下端固定有具有通孔的下盖板(33)，下盖板(33)的外固定连接有导流壳(34)，导流壳(34)与下盖板(33)之间形成用于放置叶轮(35)的叶轮腔(330)，所述卡接环槽(31)开设于导流壳(34)的上端。
  5. 根据权利要求4所述的一种深井泵，其特征在于，所述外筒套(43)的上端形成有用于下盖板(33)相抵的盖板环槽(430)。
  6. 根据权利要求4所述的一种深井泵，其特征在于，所述泵体(3)的上端设置有出水阀座(5)，出水阀座(5)与所述导流壳(34)的上端相抵，所述泵体(3)下端设置有进水支架(6)，进水支架(6)的上端与所述下盖板(33) 的边沿相抵。
PCT/CN2021/101107 2021-04-06 2021-06-19 一种深井泵 WO2022213482A1 (zh)

Applications Claiming Priority (2)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202971223U (zh) * 2012-10-08 2013-06-05 台州佳迪泵业有限公司 一种离心式深井泵
CN203404100U (zh) * 2013-06-18 2014-01-22 浙江大元泵业有限公司 高扬程潜水泵
US20140134013A1 (en) * 2011-06-17 2014-05-15 Ksb Aktiengesellschaft Immersion Pump and Method for Assembling an Immersion Pump
CN204755340U (zh) * 2015-07-29 2015-11-11 金华倍特泵业有限公司 一种深井潜水泵
CN209586711U (zh) * 2019-03-19 2019-11-05 浙江大元泵业股份有限公司 一种多腔结构的潜水泵

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140134013A1 (en) * 2011-06-17 2014-05-15 Ksb Aktiengesellschaft Immersion Pump and Method for Assembling an Immersion Pump
CN202971223U (zh) * 2012-10-08 2013-06-05 台州佳迪泵业有限公司 一种离心式深井泵
CN203404100U (zh) * 2013-06-18 2014-01-22 浙江大元泵业有限公司 高扬程潜水泵
CN204755340U (zh) * 2015-07-29 2015-11-11 金华倍特泵业有限公司 一种深井潜水泵
CN209586711U (zh) * 2019-03-19 2019-11-05 浙江大元泵业股份有限公司 一种多腔结构的潜水泵

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