KR20170092808A - Structure of double sealing for vertical multi-stage pump - Google Patents

Structure of double sealing for vertical multi-stage pump Download PDF

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Publication number
KR20170092808A
KR20170092808A KR1020160013941A KR20160013941A KR20170092808A KR 20170092808 A KR20170092808 A KR 20170092808A KR 1020160013941 A KR1020160013941 A KR 1020160013941A KR 20160013941 A KR20160013941 A KR 20160013941A KR 20170092808 A KR20170092808 A KR 20170092808A
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KR
South Korea
Prior art keywords
sealing member
seal
space
impeller
fluid
Prior art date
Application number
KR1020160013941A
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Korean (ko)
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KR101818075B1 (en
Inventor
배영석
Original Assignee
주식회사 세고산업
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Priority to KR1020160013941A priority Critical patent/KR101818075B1/en
Publication of KR20170092808A publication Critical patent/KR20170092808A/en
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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
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/106—Shaft sealings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/344—Pressing means the pressing force being applied by means of an elastic ring supporting the slip-ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/3452—Pressing means the pressing force resulting from the action of a spring

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

Abstract

The present invention relates to a double sealing structure of a multi-stage multi-stage pump. More particularly, the present invention relates to an impeller installation space (120) connected to an inlet (110) for the purpose of preventing the risk of leakage of a first fluid, And a discharge space 140 formed in the periphery of the impeller mounting space is connected to the outlet 150 so that the impeller 121 installed in the impeller mounting space 120 Lt; RTI ID = 0.0 > 1 < / RTI > A seal sleeve 170 coupled to an outer surface of the shaft between the impeller 121 and the motor; An actual housing having a second hollow fluid space 183 formed on an outer circumferential surface of the seal sleeve and having an inlet port 181 and an outlet port 182 and having a first hollow portion 184 formed on the upper side and a lower end opened; A seal cover coupled to a lower end of the seal housing and having a second hollow portion at a center thereof; An upper first sealing member 210 'in contact with the outer surface of the seal sleeve, an upper second sealing member 220' in contact with the inner surface of the first hollow portion, and an upper side second sealing member 220 'in contact with the upper side first and second sealing members, An upper mechanical seal 200 'including a rotating ring 230'; A lower first sealing member 210 "contacting the outer surface of the seal sleeve, a lower second sealing member 220" contacting the inner surface of the second hollow portion, and a lower rotatable member contacting the lower first and second sealing members, A lower mechanical chamber 200 "comprising a tingling ring 230 "; Through which it is discharged to the circulation path of the second fluid at the time of leakage of the first fluid, thereby preventing the danger due to the leakage of the first fluid.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double-

The present invention relates to an improved structure of a mechanical seal of a three-stage multi-stage pump used to prevent fluid leakage in a multi-stage pump for pumping various fluids.

In general, a vertical multi-stage pump is also called a vertical pump or a high-pressure pump. It is installed in the middle of a water pipe (water pipe) to send water to a high place in a water tank, And a sealing structure called a mechanical seal is installed inside the pump to prevent leakage of the fluid.

FIG. 1 is a cross-sectional view showing a sealing structure of a conventional multi-stage pump, and FIG. 2 is an enlarged view of a portion 'A' of FIG.

1 and 2, an inlet 110 and an outlet 150 are formed on one side and the other side of a multi-stage multi-stage pump 100, and an inlet 110 and an outlet 150 formed between the inlet 110 and the outlet 150 The impeller mounting space 120 is provided with an impeller 121 connected to a shaft 160 of a motor and a discharge space 140 formed around the impeller mounting space 120 with multi- And a passage 130 is formed between the impeller installation space 120 and the discharge space 140. [

Accordingly, when the shaft 160 and the impeller 121 rotate according to the rotation of the motor, the first fluid is sucked into the impeller installing space 120 through the inlet 110, and the first fluid sucked into the impeller installing space 120 The fluid is discharged to the discharge space 140 through the passage 130 of the partition wall and then discharged to the outlet 150 to discharge the first fluid at a high pressure.

At this time, a seal cover 101 is formed between the motor and the impeller 121, and a hollow portion 102 through which the shaft 160 passes is formed in the center of the seal cover 101, The mechanical chamber 200 is formed to prevent the first fluid from leaking to the hollow portion 102.

The mechanical seal 200 includes a first sealing member 210 closely attached to the outer surface of the shaft 160, a second sealing member 220 closely attached to the inner surface of the hollow portion 102, And a rotating ring 230 interposed between the first and second sealing members 210 and 220 so as to be closely attached to the first and second sealing members 210 and 220 .

Here, the first sealing member 210 has a cylindrical shape, and has a flange protruding outwardly from the upper and lower outer peripheral surfaces, and a spring 211 is interposed between the upper and lower flanges to maintain the repulsive force in the vertical direction .

The inner diameter of the first sealing member 210 and the outer diameter of the shaft 160 are made to be close to each other to prevent leakage of the first fluid and the second sealing member 220 and the hollow portion 102, A silicon ring 221 is provided between the first ring and the second ring to prevent leakage of the first fluid.

However, as shown in the patent document 1, the mechanical seal 200 has a lifetime of a certain period of time. If the mechanical seal 200 has a lifetime exceeding a certain period of time, leakage may occur. That is, between the first sealing member 210 and the shaft 160, Leakage occurs between the ring 230 and each of the first and second sealing members 210 and 220 or between the second sealing member 220 and the seal cover 101 so that the first fluid flows into the hollow portion 102 If the first fluid is volatile oil, if the leaked oil leaks to the electrically operated motor side, it may be ignited to cause fire or explosion.

Therefore, there is a demand for an improved sealing structure that can prevent the leakage of the first fluid to the motor side at the source even if the first fluid leaks due to the mechanical seal being unexpectedly obsolete.

1. Korean Patent No. 10-1473237

The present invention for solving the above-mentioned problems of the prior art can prevent fluid from flowing to the motor side owing to the leakage of the multi-stage multi-stage pump. In addition, when a toxic, acidic or explosive fluid is used, So that a risk factor can be removed without causing a contamination of the pump.

In order to achieve the above object, the present invention provides a double-

And an impeller connected to the shaft of the motor is provided in the impeller mounting space formed between the inlet and the outlet, and a discharge space formed around the impeller mounting space with the partition wall therebetween Stage pump connected to the outlet for discharging the first fluid sucked into the impeller installing space by the impeller rotation to the outlet via the passage and the discharge space of the partition wall;

A cylindrical seal sleeve coupled to an outer surface of the shaft between the impeller and the motor;

A space is formed in the outer circumferential surface of the seal sleeve so as to form a second fluid diesel oil space, an inlet and an outlet connected to the second fluid diesel oil space, a first hollow portion through which the seal sleeve passes, An open threaded housing;

A seal cover coupled to a lower end of the seal housing and having a second hollow portion through which the seal sleeve passes;

An upper second sealing member which is in close contact with an inner surface of the first hollow portion and an upper rotating member which is in close contact with the upper first sealing member and the upper second sealing member, An upper mechanical chamber including a ring;

A lower first sealing member disposed at a lower portion of the upper mechanical chamber and closely contacting an outer surface of the seal sleeve; a lower second sealing member closely contacting an inner surface of the second hollow portion; A lower mechanical seal including a lower rotatable ring closely contacting the two sealing members; And a control unit.

According to the double-sealing structure of the multi-stage pump of the present invention, by applying the double mechanical seal between the motor and the impeller, it is possible to prevent the first fluid discharged through the multi-stage pump from leaking to the motor side, The first fluid is circulated in a mixed state with the second fluid even when the first fluid leaks, so that the first fluid can be prevented from leaking to the motor side have.

Therefore, safety can be improved even in the case of transferring dangerous fluids such as toxic, acidic, volatile or explosive.

1 is a cross-sectional view showing a sealing structure of a conventional multi-stage pump.
2 is an enlarged view of a portion 'A' in Fig.
3 is a cross-sectional view showing a double-sealing structure of a three-stage multi-stage pump according to a first embodiment of the present invention.
4 is a cross-sectional view of a mechanical seal portion as a main portion of Fig. 3;
5 is a cross-sectional view showing a double-sealing structure of a three-stage multi-stage pump according to a second embodiment of the present invention.
6 is a cross-sectional view of a mechanical seal portion as a main portion of Fig. 5;

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 3 to 6. FIG. It should be understood, however, that there is no intention to limit the invention to the particular form disclosed herein, and that the appended claims are not to be construed as limiting the present invention, The detailed description of the contents overlapping with those described in Document 1 will be omitted.

3 is a cross-sectional view showing a double-sealing structure of a multi-stage multi-stage pump according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view of a mechanical seal portion as a recess in FIG.

3 and 4, the double sealing structure of the multi-stage multi-stage pump according to the first embodiment of the present invention is such that the double mechanical seals 200 'and 200' 'are provided in the multi- .

An inlet 110 and an outlet 150 are formed on one side and the other side of the three-stage multi-stage pump 100. A motor (not shown) is installed in the impeller installation space 120 formed between the inlet 110 and the outlet 150, And a discharge space 140 formed at the periphery of the impeller installation space 120 with a plurality of partition walls therebetween is connected to the outlet 150, A passage 130 is formed between the impeller installing space 120 and the discharge space 140. This is a typical structure and has been described with reference to FIG. 1, so a detailed description thereof will be omitted.

The present invention for applying the double mechanical seals 200 'and 200' 'to the three-stage multi-stage pump 100 includes the seal sleeve 170, the seal housing 180, the seal cover 190 and the upper mechanical seal 200 'and a lower mechanical seal 200' '.

The seal sleeve 170 has a cylindrical shape coupled to the outer surface of the shaft 160 between the impeller 121 and the motor and is an element that rotates in conjunction with the rotation of the shaft 160.

The seal housing 180 has a space formed therein so that a second fluid diesel oil space 183 is formed on an outer circumferential surface of the seal sleeve 170 and is connected to the second fluid diesel oil space 183 on one side and the other side, And has an inlet 181 and an outlet 182. A first hollow portion 184 through which the seal sleeve 170 passes is formed on the upper side and a lower end is opened.

The inlet 181 is connected to the inlet duct 181 and the outlet 182 is connected to the outlet 182 to neutralize the second fluid, Or the like can be introduced through the inlet port 181 and discharged to the outlet port 182 through the second fluid diesel fuel space 183.

The seal cover 190 is fastened to the lower end of the seal housing 180 by bolts or the like so as to close the open face of the seal housing 180, The second hollow portion 191 is formed.

The upper mechanical seal 200 'includes an upper first sealing member 210' closely contacting the outer surface of the seal sleeve 170 and an upper second sealing member 210 'closely contacting the inner surface of the first hollow portion 183. And an upper rotating ring 230 'closely contacting the upper first sealing member 210' and the upper second sealing member 220 '.

Here, the term 'closely coupled' means that two elements are in contact with each other to prevent leakage at least. For example, the upper first sealing member 210 'is made of elastic material such as rubber or silicone , The inner diameter of the upper first sealing member 210 'and the outer diameter of the seal sleeve 170 are made to be 1: 1 or the inner diameter of the upper first sealing member 210' is made smaller, (Not shown) such as silicone or rubber between the upper second sealing member 220 'and the first hollow portion 183 to prevent leakage of the fluid, .

The lower mechanical seal 200 '' is for sealing the second hollow 191 of the seal cover 190 and is disposed below the upper mechanical seal 200 ' A lower first sealing member 210 "closely contacting the inner surface of the second hollow portion 191 and a lower second sealing member 220" closely contacting the inner surface of the second hollow portion 191. The lower first sealing member 210 " And a lower rotating ring 230 "which is in close contact with the second sealing member 220 ".

Here, the term 'close' means that the two elements are in contact with each other to prevent at least leakage, and the same structure as the close mechanical structure of the upper mechanical chamber 200 'can be applied.

The upper first sealing member 210 'is disposed in the second fluid diesel space 183 and the lower end of the upper first sealing member 210' is disposed in the outer peripheral surface of the seal sleeve 170, And the upper end of the upper first sealing member 210 'may be in contact with the upper rotating ring 230'.

The lower first sealing member 210 "is disposed in the impeller installation space 120 under the seal cover 190 and the lower end of the lower first sealing member 210" And the upper end of the lower first sealing member 210 '' is disposed in contact with the lower rotating ring 230 ''.

At this time, when the pressure in the second fluid diesel oil space 183 is larger than the pressure in the impeller installing space 120, the lower second sealing member 220 '' may be pushed toward the lower first sealing member 210 ' In this case, since the second fluid may leak into the impeller installation space 120, it is preferable that the pressure in the second fluid light space 183 is smaller than the pressure in the impeller installation space 120.

With this configuration, the first fluid in the impeller installation space 120 is leaked due to the deterioration of the lower mechanical chamber 200 "(for example, the lower rotating ring 210 " rotating together with the lower first sealing member 210" (Between the first lower sealing member 230 '' and the lower second sealing member 220 '' that is fixed without rotation) and flows into the second fluid diesel space 183, the upper mechanical seal 200 'does not leak to the motor side. And is discharged through the outlet 182 together with the second fluid circulating through the second fluid diesel oil space 183, so that leakage to the motor side can be originally blocked.

FIG. 5 is a cross-sectional view showing a double-sealing structure of a multi-stage multi-stage pump according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view of a mechanical seal portion as a recess in FIG.

The double-sealing structure of the multi-stage multi-stage pump according to the second embodiment of the present invention with reference to Figs. 5 and 6 is different from that of the first embodiment only in the arrangement of the lower mechanical chamber 200 " And the remaining components are structurally the same. Therefore, repeated description of components having the same structure is omitted, and the arrangement of the lower mechanical chamber 200 "will be described below.

6, the lower mechanical seal 200 '' is for sealing the second hollow portion 191 of the seal cover 190, and the lower first seal member 210 '' is provided on the upper portion of the seal cover 190 ' And the upper end of the lower first sealing member 210 "is held in contact with the lower end of the support ring 172 fixed to the outer peripheral surface of the seal sleeve 170, And the lower end of the one-sealing member 210 "is disposed in contact with the lower rotating ring 230 ".

At this time, when the pressure in the second fluid diesel oil space 183 is smaller than the pressure in the impeller installing space 120, the lower second sealing member 220 '' may be pushed toward the lower first sealing member 210 ' In this case, since the first fluid may leak into the second fluid diesel oil space 183, the pressure in the second fluid diesel oil space 183 is preferably larger than the pressure in the impeller installing space 120.

With this configuration, when the leakage occurs due to the deterioration of the lower mechanical chamber 200 '', the pressure of the second fluid diesel oil space 183 is greater than the pressure of the impeller installing space 120, 120 so that leakage of the first fluid can be prevented originally and thus the first fluid can not be abraded or abraded due to the use of a fluid having abrasive or acidity or an explosion-dangerous or viscous fluid. It can be safely used even when defects or clogging occur.

The upper first sealing member 210 'and the lower first sealing member 210' are made of elastic material such as rubber or silicone. Each of the upper first sealing member 210 'and the lower first sealing member 210' has a cylindrical shape, (Not shown) protruding outwardly from the flange, and a coil spring is interposed between the upper and lower flanges to maintain a repulsive force with respect to each flange. In this case, each of the first sealing members 210 ' 210 "push the respective rotating rings 230 'and 230" to increase the contact force with the respective second sealing members 220' and 220 ", thereby improving the airtightness.

Although the present invention has been described in connection with the preferred embodiments described above, it will be appreciated by those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention, All such changes and modifications are intended to be within the scope of the appended claims.

100: stage type multi-stage pump 110: inlet
120: impeller installation space 121: impeller
130: passage 140: discharge space
150: outlet 160: shaft
170: seal sleeve
171: Supporting protrusion 172: Supporting ring
180: seal housing
181: Inlet port 182: Outlet port
183: second fluid diesel oil space 184: first hollow portion
190: seal cover 191: second hollow portion
200: Mechanical seal
210: first sealing member 211: spring
220: second seal member 221: o-ring
230: rotating ring

Claims (7)

And an impeller connected to the shaft of the motor is provided in the impeller mounting space formed between the inlet and the outlet, and a discharge space formed around the impeller mounting space with the partition wall therebetween Stage pump connected to the outlet for discharging the first fluid drawn into the impeller installing space by the impeller rotation to the outlet via the passage and the discharge space of the partition wall;
A cylindrical seal sleeve coupled to an outer surface of the shaft between the impeller and the motor;
A space is formed in the outer circumferential surface of the seal sleeve so as to form a second fluid diesel oil space, an inlet and an outlet connected to the second fluid diesel oil space, a first hollow portion through which the seal sleeve passes, An open threaded housing;
A seal cover coupled to a lower end of the seal housing and having a second hollow portion through which the seal sleeve passes;
An upper second sealing member which is in close contact with an inner surface of the first hollow portion and an upper rotating member which is in close contact with the upper first sealing member and the upper second sealing member, An upper mechanical chamber including a ring;
A lower first sealing member disposed at a lower portion of the upper mechanical chamber and closely contacting an outer surface of the seal sleeve; a lower second sealing member closely contacting an inner surface of the second hollow portion; A lower mechanical seal including a lower rotatable ring closely contacting the two sealing members; The double-sealing structure of the multi-stage pump.
The apparatus according to claim 1, wherein the upper mechanical chamber
Wherein an upper first sealing member is disposed in the second fluid diesel oil space and a lower end of the upper first sealing member is held in abutment with an upper end of a support ring fixed to an outer peripheral surface of the seal sleeve, And the upper rotating ring is brought into contact with the upper rotating ring.
3. The method of claim 2,
The lower first mechanical seal chamber is disposed in the impeller mounting space at the lower end of the seal cover and the lower end of the lower first seal member is held in abutment with the upper end of the support protrusion protruded from the lower end of the seal sleeve, And the upper end of the sealing member is in contact with the lower rotating ring.
The method of claim 3,
And the pressure in the second fluid diesel oil space is smaller than the pressure in the impeller installing space.
3. The method of claim 2,
Wherein the lower mechanical seal is disposed such that the lower first sealing member is disposed in the second fluid diesel oil space and the upper end of the lower first sealing member is held in abutment with the lower end of the support ring fixed to the outer peripheral surface of the seal sleeve, And the lower end of the member is in contact with the lower rotating ring.
6. The method of claim 5,
Wherein the pressure in the second fluid diesel oil space is greater than the pressure in the impeller installation space.
7. The method according to any one of claims 1 to 6,
The upper first sealing member and the lower first sealing member are made of a stretchable material and have a cylindrical tubular shape and have a flange protruding outwardly from the upper and lower outer circumferential surfaces respectively. So that a repulsive force acts on the double-layered pump.
KR1020160013941A 2016-02-04 2016-02-04 Structure of double sealing for vertical multi-stage pump KR101818075B1 (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
KR1020160013941A KR101818075B1 (en) 2016-02-04 2016-02-04 Structure of double sealing for vertical multi-stage pump

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KR20170092808A true KR20170092808A (en) 2017-08-14
KR101818075B1 KR101818075B1 (en) 2018-01-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200120864A (en) * 2019-04-11 2020-10-22 왈러스 펌프 코퍼레이션 리미티드 Vertical pump structure
CN112628146A (en) * 2020-12-31 2021-04-09 上海凯泉泵业（集团）有限公司 Multistage double suction pump with vertical structure

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4633396B2 (en) * 2004-07-16 2011-02-16 株式会社荏原製作所 Centrifugal pump
JP4785996B1 (en) * 2011-03-29 2011-10-05 株式会社寺田ポンプ製作所 Oil lifter device for lubricating sliding surface in oil chamber shaft seal device of submersible pump
KR101370556B1 (en) * 2013-10-18 2014-03-06 대웅기업주식회사 Dual sealing structure for underwater pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200120864A (en) * 2019-04-11 2020-10-22 왈러스 펌프 코퍼레이션 리미티드 Vertical pump structure
US11415145B2 (en) * 2019-04-11 2022-08-16 Walrus Pump Co., Ltd. Vertical pump structure
CN112628146A (en) * 2020-12-31 2021-04-09 上海凯泉泵业（集团）有限公司 Multistage double suction pump with vertical structure

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