CN110671356B - Sealing structure of horizontal split pump and mounting method thereof - Google Patents
Sealing structure of horizontal split pump and mounting method thereof Download PDFInfo
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- CN110671356B CN110671356B CN201910954491.6A CN201910954491A CN110671356B CN 110671356 B CN110671356 B CN 110671356B CN 201910954491 A CN201910954491 A CN 201910954491A CN 110671356 B CN110671356 B CN 110671356B
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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
- F04D29/086—Sealings especially adapted for liquid pumps
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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
Abstract
The invention provides a sealing structure of a horizontal split pump and an installation method thereof, and solves the problems that the process requirement of the existing horizontal split pump adopting hard-to-hard metal sealing is high, the flat gasket sealing cost is high, the gluing sealing reliability is poor, and interstage sealing is lacked. The sealing structure comprises a three-dimensional sealing groove and an integrated sealing element matched with the three-dimensional sealing groove; the three-dimensional sealing groove is formed by sealing ring sealing grooves which are respectively positioned on the peripheries of the N shell sealing rings and sealing grooves on the upper pump body and the lower pump body; the sealing grooves on the upper pump body and the lower pump body comprise two pump body sealing grooves on the middle opening surface of the lower pump body and two pump shaft end sealing grooves; two ends of the two pump body sealing grooves are respectively connected with the two pump shaft end sealing grooves, and each sealing ring sealing groove is connected with the two pump body sealing grooves; n is determined by the stage number of the horizontal split pump, the impeller form and the impeller arrangement position.
Description
Technical Field
The invention belongs to the sealing technology of split pumps, and particularly relates to a sealing structure of a horizontal split pump and an installation method thereof.
Background
The horizontal split pump has the structural characteristics of quickly replacing a rotor part and a quick-wear part, the overhaul and maintenance time of the pump can be shortened, and the split sealing technology and the sealing capacity are main aspects for limiting the application of the horizontal split pump.
At present, the main sealing modes of the split-face sealing are hard-to-hard metal sealing, flat gasket sealing, glue coating sealing and the like, and the sealing of the three modes has a certain effect on the split-face sealing, but the interstage sealing is lacked. The hard-to-hard metal sealing has extremely high requirements on the process and the processing capacity, and the common process is difficult to realize; secondly, the flat gasket sealing requires a processing technology and is very high in cost; the gluing and sealing are more economical among the three, but have poor reliability, and are less used in the industry.
Disclosure of Invention
The invention aims to solve the problems that the process requirement of the existing horizontal split pump adopting hard-on-hard metal sealing is high, the flat gasket sealing cost is high, the gluing sealing reliability is poor, and interstage sealing is lacked, and provides a sealing structure of the horizontal split pump and an installation method thereof.
The conception of the invention is as follows:
the integral sealing element is matched with a three-dimensional sealing groove arranged around the pump body and the liquid filling cavity, so that the sealing effect between the horizontal split pump split surface and the impeller stage is achieved, and the horizontal axial surface and the radial full-surrounding sealing effect is achieved.
In order to achieve the purpose, the technical solution provided by the invention is as follows:
a sealing structure of a horizontal split pump is characterized by comprising a three-dimensional sealing groove and an integrated sealing element matched with the three-dimensional sealing groove;
the three-dimensional sealing groove is formed by sealing ring sealing grooves which are respectively positioned on the peripheries of the N shell sealing rings and sealing grooves on the upper pump body and the lower pump body; the sealing ring sealing grooves are sealing grooves on the periphery of each shell sealing ring, namely, each liquid filling cavity is sealed to form an independent sealing cavity so as to realize pump cavity interstage sealing;
the sealing grooves on the upper pump body and the lower pump body comprise two pump body sealing grooves and two pump shaft end sealing grooves;
the two pump body sealing grooves are respectively positioned between a pump body bolt hole of the lower pump body at two sides of the pump shaft and a volute chamber flow channel and are used for realizing the sealing between a pump liquid cavity and an atmosphere side and between a pump cavity and a pump cavity;
the two pump shaft end sealing grooves are respectively positioned on the pump shaft sealing end faces formed at the two ends of the upper pump body and the lower pump body and are used for realizing the sealing between the mechanical sealing cavity and the mechanical sealing gland;
two ends of the two pump body sealing grooves are respectively communicated with the two pump shaft end sealing grooves, each sealing ring sealing groove is communicated with the two pump body sealing grooves to jointly form a three-dimensional sealing groove, and the integrated sealing element is arranged in the sealing groove to realize full-surrounding three-dimensional sealing of the horizontal split pump;
the integrated sealing element consists of two sealing rings A matched with the sealing groove of the pump body, a sealing ring B matched with the sealing groove of the sealing ring and two sealing rings C matched with the sealing groove of the pump shaft end;
the N is determined by the stage number of the horizontal split pump, the impeller form and the impeller arrangement position;
in order to reduce the sealing pretightening force of the main bolt with the middle opening surface and prolong the service life of the integrated sealing element, the pump body sealing groove is arranged close to the volute chamber flow channel and is positioned at 1/3 between the volute chamber flow channel and the pump body bolt hole, and the minimum distance from the pump body sealing groove to the pump body bolt hole is 1/2 of the diameter of the bolt; the pump shaft end sealing groove is positioned between a connecting bolt of the mechanical sealing device and the outer diameter of the shaft end sealing cavity; the sealing groove of the sealing ring is arranged to avoid the stopping device on the sealing ring.
Furthermore, the pump body sealing groove is communicated with each sealing ring sealing groove through a cavity sealing groove positioned on the middle opening surface of the lower pump body, and the condition is suitable for the condition of low sealing pressure;
or the pump body sealing grooves are designed according to the type and are directly communicated with each sealing ring sealing groove, so that the weak points of the integrated sealing element are avoided, and the integrated sealing element is suitable for being used when the sealing pressure is high.
Furthermore, the three-dimensional sealing groove is a rectangular groove, is easy and convenient to machine, and has a width of 7.30 +0.25mm, depth of 4.240 +0.10mm; of course, other shapes of grooves may be used, such as: v-shaped groove, triangular groove.
Further, due to the fact that cylindrical static seals and planar static seals exist in the matching seal between the three-dimensional sealing groove and the integrated sealing element, the compression rate W% of the integrated sealing element is 15%;
W％＝(d0-h)/d0
wherein d is0The outer diameter of the rubber ring in the integrated sealing element is h, and the depth of the groove is h.
Further, the integrated sealing element is integrally formed or bonded.
Further, the integrated sealing element is a one-step molded injection molding rubber ring or a one-step molded fast bonding colloid.
The invention also provides an installation method of the sealing structure of the horizontal split pump, which is characterized by comprising the following steps:
1) installing an integral seal element in a seal groove located on the lower pump body;
2) cutting off a sealing ring C and a sealing ring B which are matched with the pump shaft end sealing groove and the sealing ring sealing groove to form a notch;
3) mounting a rotor assembly on the lower pump body along with the shell sealing ring through the notch, wherein the rotor assembly comprises an assembled shaft, an impeller, a bearing box and a rotor;
4) aligning and bonding the notches by using an adhesive to recover an integrated sealing element, so that the sealing ring B and the sealing ring C are respectively positioned in a sealing groove of the sealing ring and a sealing groove at the pump shaft end which are matched with the sealing ring B and the sealing ring C;
5) and the upper pump body and the lower pump body are mounted in a covering manner.
Further, in the step 2), the sealing ring C and the sealing ring B which are installed in a matched manner with the pump shaft end sealing groove and the sealing ring sealing groove are cut off along the position of the axial lead of the inlet side of the pump body which deviates from the middle opening surface by 20 degrees plus or minus 5 degrees to form a notch, so that the rotor assembly is convenient to install, and the influence on the rubber ring of the sealing element is reduced when the upper and lower pump bodies are installed in a closed manner; in the actual installation process, the negative deviation can be adopted for the large pump body, and the positive deviation can be adopted for the small pump body.
The invention has the advantages that:
1. the invention realizes the sealing of the leakage of the pump cavity and the atmosphere side open face, the interstage leakage of the pump cavity and the leakage between the mechanical seal cavity and the mechanical seal gland by arranging the seal grooves around the pump body and the liquid filling cavity and sealing each liquid filling cavity by using the three-dimensional fully-surrounded seal element to form an independent seal cavity, thereby realizing the fully-surrounded three-dimensional sealing of the horizontal split pump. The invention reduces the machining difficulty and the requirement on machining equipment while meeting the sealing requirement, improves the machining efficiency and reduces the machining and manufacturing cost; on the premise of meeting the sealing effect, the method can reduce the weight of the pump shell by at least 5 percent, reduce the material cost and obviously reduce the cost and improve the efficiency of high-quality products; meanwhile, the processing requirement on the split surface of the horizontal split pump can be properly reduced, the number of main bolts is properly reduced, the processing and the use of bolt holes and main bolt nuts are reduced, and the cost is further reduced on the whole.
2. The pump body sealing groove is only selected to be arranged on the lower pump body, so that the installation of the sealing element is convenient, if the groove is formed in the upper pump body, the installation and alignment are not facilitated, and the upper pump body and the lower pump body are easy to misplace during cover closing installation, so that the sealing ring is damaged and fails.
3. The present invention can reduce seal element costs in high pressure applications compared to hard-to-hard metal seals and flat gasket seals.
4. The installation method of the sealing structure can ensure that the integrated sealing element is just installed in the sealing groove of the sealing ring at the periphery of the sealing ring of the shell and the sealing grooves of the upper pump body and the lower pump body, and the sealing element is integrated, so that accurate sealing can be achieved, and the effect of fully surrounding and sealing the horizontal axial surface and the radial direction is realized.
Drawings
FIG. 1 is a schematic plan view of a first seal structure of the present invention;
FIG. 2 is a schematic perspective view of a seal groove in a first seal structure of the present invention;
FIG. 3 is a schematic perspective view of an integral seal element of a first seal configuration of the present invention;
FIG. 4 is a schematic perspective view of a horizontal split pump employing a first seal configuration of the present invention;
FIG. 5 is a schematic perspective view of a horizontal split pump employing a second seal configuration of the present invention;
the reference numbers are as follows:
1-sealing a groove on a pump body; 11-cavity sealing groove; 2-pump shaft end sealing groove; 3-sealing the sealing ring to seal the groove; 4-pump body bolt hole.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
a sealing structure of a horizontal split pump comprises a three-dimensional sealing groove and an integrated sealing element matched with the three-dimensional sealing groove.
The three-dimensional sealing groove is formed by sealing ring sealing grooves 3 which are respectively positioned on the peripheries of the N shell sealing rings and sealing grooves on the upper pump body and the lower pump body; the sealing groove 3 of the sealing ring is arranged to avoid the stopping device on the sealing ring; the sealing grooves on the upper pump body and the lower pump body comprise two pump body sealing grooves 1 and two pump shaft end sealing grooves 2; the two pump body sealing grooves 1 are respectively positioned between a pump body bolt hole and a volute chamber flow channel of a middle opening surface of a lower pump body on two sides of a pump shaft and used for realizing sealing between a pump liquid cavity and an atmosphere side and between a pump cavity and the pump cavity, and in order to reduce the sealing pretightening force of a main bolt of the middle opening surface and prolong the service life of an integrated sealing element, the pump body sealing grooves are arranged close to the volute chamber flow channel, are positioned at 1/3 positions of the volute chamber flow channel and the pump body bolt hole, and have the minimum distance from the pump body bolt hole of 1/2 of the diameter of the; the two pump shaft end sealing grooves 2 are respectively positioned on the pump shaft sealing end faces formed at the two ends of the upper pump body and the lower pump body, and are specifically positioned between a connecting bolt of a mechanical sealing device and the outer diameter of a shaft end sealing cavity, so as to realize the sealing between the mechanical sealing cavity and a mechanical sealing gland; the two ends of the two pump body sealing grooves 1 are respectively connected with the two pump shaft end sealing grooves 2, each sealing ring sealing groove 3 is connected with the two pump body sealing grooves 1 to jointly form a three-dimensional sealing groove, and the integrated sealing element is arranged in the sealing groove to realize the full-surrounding three-dimensional sealing of the horizontal split pump; n is determined by the stage number of the horizontal split pump, the impeller form and the impeller arrangement position.
In the present embodiment, as shown in fig. 1 to 5, the horizontal split pump is a single-stage double-suction pump, and therefore, there are two sealing ring sealing grooves 3 respectively located outside each housing sealing ring; in the sealing grooves of the upper pump body and the lower pump body, two ends of two pump body sealing grooves 1 are connected with two pump shaft end sealing grooves 2, and two sealing ring sealing grooves 3 are connected with the two pump body sealing grooves 1 to jointly form a three-dimensional sealing groove; under the condition of lower sealing pressure, the pump body sealing groove 1 is communicated with each sealing ring sealing groove through a cavity sealing groove 11 positioned on the middle open surface of the lower pump body, as shown in fig. 2 specifically; under the condition of high sealing pressure, in order to avoid the weak point of the integrated sealing element and break through the integrated sealing element by high pressure, the sealing grooves of the pump body are designed along with the shape and are directly communicated with each sealing groove of the sealing ring through the sealing grooves, and the sealing grooves are specifically shown in fig. 5; the integrated sealing element consists of two sealing rings A matched with the pump body sealing groove 1, two sealing rings B matched with the sealing ring sealing groove 3 and two sealing rings C matched with the pump shaft end sealing groove 2.
The three-dimensional sealing groove is a rectangular groove, is simple and convenient to process and has a width of 7.30 +0.25mm, depth of 4.240 +0.10mm; of course, other shapes of grooves may be used, such as: v-shaped groove, triangular groove.
After the upper pump shell and the lower pump shell are in butt joint, a closed three-dimensional sealing groove is formed, and the integrated sealing element is installed in the sealing groove to realize full-surrounding three-dimensional sealing of the horizontal split pump. The specific installation method is as follows:
1) installing an integrated sealing element in a sealing groove on a lower pump body, wherein at the moment, two sealing rings A are just fittingly installed in two pump body sealing grooves 1 (certainly, the two sealing rings A also comprise cavity sealing grooves), and the lower parts of two sealing rings C are just fittingly installed in two pump shaft end sealing grooves 2 respectively;
2) cutting off the positions of a sealing ring C and a sealing ring B (namely the upper parts of the sealing ring C and the sealing ring B) which are matched with the pump shaft sealing groove and the sealing ring sealing groove 3 and are arranged along the axial lead of the inlet side of the pump body and deviate from the middle opening surface angle by 20 degrees +/-5 degrees (negative deviation is adopted for a large pump body, and positive deviation is adopted for a small pump body), and forming a notch;
3) mounting a rotor assembly on the lower pump body along with the shell sealing ring through the notch, wherein the rotor assembly comprises an assembled shaft, an impeller, a bearing box and a rotor;
4) aligning and bonding the notches by using an adhesive to recover an integrated sealing element, so that a sealing ring B and a sealing ring C are respectively positioned in a sealing groove 3 of a sealing ring and a sealing groove 2 at the pump shaft end, which are matched with the sealing ring B and the sealing ring C;
5) the upper pump body and the lower pump body are installed in a closed cover mode, and at the moment, the integrated sealing element and the three-dimensional sealing groove can be sealed in a matched mode.
Generally, for the compression rate of the sealing element, the cylindrical static seal is 10-15%; the plane static seal is 15% -30%; the reciprocating motion seal is 10% -15%; the rotary seal has an inner diameter 3-5% larger than the shaft and an outer diameter compression ratio 3-8%; the low friction seal is generally 5-8%; in the invention, because the matching seal between the three-dimensional sealing groove and the integrated sealing element has cylindrical static seal and planar static seal, the compression rate W% of the integrated sealing element is 15%;
W％＝(d0-h)/d0
wherein d is0The outer diameter of a rubber ring in the integrated sealing element is h, and the depth of the groove is h; the housing can be slotted according to corresponding sealing parameters.
The invention uses the integrated sealing element and the three-dimensional sealing groove to cooperate to play the role of sealing the horizontal split pump, and the sealing grooves are arranged on the periphery of the shell sealing ring and the sealing surface of the pump body, and the integrated sealing element is arranged in the combined three-dimensional sealing groove, so that each liquid filling cavity in the pump forms an independent sealing unit (namely, each cavity of the sealed liquid is mutually independent), thereby achieving the purpose of preventing the leakage phenomena between the liquid filling cavities and the atmosphere side. The used integrated sealing element is not limited to a one-step molded injection molding rubber ring and similar quick sealing colloid; the integrated sealing element can be integrated or bonded or filled with colloid so as to achieve the effect of fully surrounding and sealing the horizontal axial surface and the radial direction.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present disclosure.
Claims (8)
1. The utility model provides a seal structure of horizontal split pump which characterized in that: the sealing device comprises a three-dimensional sealing groove and an integrated sealing element matched with the three-dimensional sealing groove;
the three-dimensional sealing groove is formed by sealing ring sealing grooves (3) which are respectively positioned on the peripheries of the N shell sealing rings and sealing grooves on the upper pump body and the lower pump body;
the sealing grooves on the upper pump body and the lower pump body comprise two pump body sealing grooves (1) and two pump shaft end sealing grooves (2);
the two pump body sealing grooves (1) are respectively positioned between a pump body bolt hole (4) of a lower pump body middle opening surface at two sides of the pump shaft and a volute chamber runner;
the two pump shaft end sealing grooves (2) are respectively positioned on the pump shaft sealing end faces formed at the two ends of the upper pump body and the lower pump body;
two ends of the two pump body sealing grooves (1) are respectively communicated with the two pump shaft end sealing grooves (2), and each sealing ring sealing groove (3) is communicated with the two pump body sealing grooves (1);
the integrated sealing element consists of two sealing rings A matched with the pump body sealing groove (1), a sealing ring B matched with the sealing ring sealing groove (3) and two sealing rings C matched with the pump shaft end sealing groove (2);
the N is determined by the stage number of the horizontal split pump, the impeller form and the impeller arrangement position;
the pump body sealing groove (1) is arranged close to the volute chamber flow channel, is positioned at 1/3 between the volute chamber flow channel and the pump body bolt hole (4), and has the minimum distance from the pump body bolt hole being 1/2 of the diameter of the bolt;
the pump shaft end sealing groove is positioned between a connecting bolt of the mechanical sealing device and the outer diameter of the shaft end sealing cavity;
the sealing groove of the sealing ring is arranged to avoid the stopping device on the sealing ring.
2. A seal structure of a horizontal split pump according to claim 1, wherein:
the pump body sealing groove (1) is communicated with each sealing ring sealing groove (3) through a cavity sealing groove (11) positioned on the middle opening surface of the lower pump body;
or the pump body sealing groove is designed along with the type and is directly communicated with each sealing ring sealing groove through the pump body sealing groove.
3. A seal structure of a horizontal split pump according to claim 1, wherein: the three-dimensional sealing groove is a rectangular groove with the width of
A depth of
4. A seal structure of a horizontal split pump according to claim 3, wherein: the compression ratio W% of the integrated seal member is 15%;
W％＝(d0-h)/d0
wherein d is0The outer diameter of the rubber ring in the integrated sealing element is h, and the depth of the groove is h.
5. A seal structure of a horizontal split pump according to claim 2, wherein: the integrated sealing element is integrally formed or bonded.
6. A seal structure of a horizontal split pump according to claim 1, wherein: the integrated sealing element is an injection molding rubber ring formed in one step or a quick bonding colloid formed in one step.
7. A method of installing a seal structure of a horizontal split pump according to claim 1, comprising the steps of:
1) installing an integral seal element in a seal groove located on the lower pump body;
2) cutting off a sealing ring C and a sealing ring B which are matched with the pump shaft end sealing groove (2) and the sealing ring sealing groove (3) to form a notch;
3) mounting a rotor assembly on the lower pump body along with the shell sealing ring through the notch, wherein the rotor assembly comprises an assembled shaft, an impeller, a bearing box and a rotor;
4) aligning and bonding the notches by using an adhesive to recover an integrated sealing element, so that a sealing ring B and a sealing ring C are respectively positioned in a sealing groove (3) of a sealing ring and a sealing groove (2) at the pump shaft end, which are matched with the sealing ring B and the sealing ring C;
5) and the upper pump body and the lower pump body are mounted in a covering manner.
8. The mounting method according to claim 7, wherein: in the step 2), the sealing ring C and the sealing ring B which are matched with the pump shaft end sealing groove (2) and the sealing ring sealing groove (3) are cut off along the position of the axial lead of the inlet side of the pump body which deviates from the middle opening surface by 20 degrees +/-5 degrees to form a notch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910954491.6A CN110671356B (en) | 2019-10-09 | 2019-10-09 | Sealing structure of horizontal split pump and mounting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910954491.6A CN110671356B (en) | 2019-10-09 | 2019-10-09 | Sealing structure of horizontal split pump and mounting method thereof |
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| Publication Number | Publication Date |
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| CN110671356A CN110671356A (en) | 2020-01-10 |
| CN110671356B true CN110671356B (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910954491.6A Active CN110671356B (en) | 2019-10-09 | 2019-10-09 | Sealing structure of horizontal split pump and mounting method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112922903A (en) * | 2021-03-23 | 2021-06-08 | 西安航天泵业有限公司 | Horizontal split pump capable of realizing diversion of leaked liquid |
Citations (3)
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|---|---|---|---|---|
| CN107781165A (en) * | 2017-10-20 | 2018-03-09 | 项达章 | Centrifugal pump is driven in a kind of horizontal type level |
| CN208396942U (en) * | 2018-07-07 | 2019-01-18 | 普仑斯(福建)泵业有限公司 | The single-stage double-suction middle-opening pump that anti-seal ring falls off |
| CN208831335U (en) * | 2018-07-21 | 2019-05-07 | 浙江东航消防泵业有限公司 | A kind of middle-opening pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10309416B2 (en) * | 2012-11-29 | 2019-06-04 | Ruhrpumpen Sa De Cv | Seal system for centrifugal pumps having axially split casings |
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2019
- 2019-10-09 CN CN201910954491.6A patent/CN110671356B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107781165A (en) * | 2017-10-20 | 2018-03-09 | 项达章 | Centrifugal pump is driven in a kind of horizontal type level |
| CN208396942U (en) * | 2018-07-07 | 2019-01-18 | 普仑斯(福建)泵业有限公司 | The single-stage double-suction middle-opening pump that anti-seal ring falls off |
| CN208831335U (en) * | 2018-07-21 | 2019-05-07 | 浙江东航消防泵业有限公司 | A kind of middle-opening pump |
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