JP4493069B2 - Submersible pump shaft seal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft sealing device suitable for a submersible pump, in particular, having low cost and good assembling workability without manufacturing a special shaft, and holding its sealing performance without the abnormal wear of a shaft even in liquid including sand and slurry, the residence of the liquid in a circular gap on the outer periphery of a shaft guide-down portion and the face roughness and opening due to the accumulation of deposits resulting in the poor start of the pump or biting between sliding faces. <P>SOLUTION: A fixed sealing ring 6 is supported by a housing 1, the shaft guide-down portion 7 having a fitted shaft sleeve 14 is loosely fitted to the fixed sealing ring 6 and a shaft through-hole 4 to hold a circular gap 8 on the outer peripheral face of the shaft sleeve 14, a rotary sealing ring 9 is fitted to the shaft sleeve 14 so that it is rotated right over the fixed sealing ring 6 together with the shaft and has slide contact with the fixed sealing ring with spring energization, and a stirring blade 13 extending decliningly to the rotating direction of the shaft is attached to the outer peripheral face of the shaft sleeve 14. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の技術分野】
本発明は、水中ポンプ等に装着される軸封装置に関するものである。
【０００２】
【従来技術とその問題点】
周知のように水中ポンプでは一般に、ポンプ渦流室とオイル室との間に介在する隔壁の中央にシャフト貫通孔が穿設されており、該貫通孔の上端外周に凹設された環溝には軸封装置の固定密封環が嵌着され、該固定密封環およびシャフト貫通孔に遊嵌されたシャフト導下部の外周には環状間隙が保有され、固定密封環の直上においてシャフトと共に回転しバネ付勢により固定密封環と摺接するよう回転密封環がシャフト導下部に嵌合されているが、上記環状間隙に停留している液体が摺動発熱等により固形物を析出し、その析出物が固定密封環およびシャフト貫通孔の内周に付着し、それが堆積してポンプの始動不良の原因となり、また、上記析出物が固定密封環と回転密封環との摺接面間へ噛み込んで面荒れや面開きを惹起してシール性能が阻害されることになる。このような問題を解消させるため、シャフト導下部の外周にスパイラル溝を刻設して、シャフトの回転に伴うネジポンプ作用で析出物をポンプ室側へ押し出させようとするものがある（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開２０００−２７４３８０号公報 （図１）
【０００４】
【発明が解決しょうとする課題】
しかし特許文献１の構造では、汎用のシャフトを使用することができず専用のものを製作することが必要なためコスト高となり、且つシャフトの強度にも問題を残すことになる。
また、回転密封環の組込み時にスパイラル溝によってOリング等付帯部材が損傷され易いという、組立上の困難性をも伴うことになる。更にまた、特許文献１の構造によれば、油中など粘性の強い液体中での使用には適しているが、工事現場のように砂やスラリー等を含む液体中で使用すれば、シャフトに刻設されているスパイラル溝が異常摩耗を来たし、シャフトの早期折損事故を招く要因となる。
また、上記スパイラル溝の摩耗に伴う補修作業についてはシャフト全体の交換という大修理となって多大の修理費用を要することになる。
【０００５】
本発明は上述の課題を解決して、専用のシャフトを製作することを要せず汎用のシャフトを使用して強度を低下させることなく、ローコストで組立作業も容易に行われ且つ砂やスラリー等によるシャフトの異常摩耗がなく、固定密封環およびシャフト貫通孔の内周とシャフト導下部に嵌装された軸スリーブの外周の環状間隙内を撹拌して液体の停留を阻止し、析出物の堆積によるポンプの始動不良を来たすことがなく、摺接面間への上記析出物や液中の異物等の噛み込みによる面荒れや面開きを生じさせることもなく、シール性能が保持せられ、水中ポンプ用として好適な軸封装置を提供することを目的とする。
【０００６】
【発明の構成】
本発明に係る水中ポンプ軸封装置では、シャフト貫通孔の上端外側に環溝を凹設して固定密封環支承用のハウジングを構成し、軸封装置の固定密封環を上記環溝内へ該固定密封環の背端面と該環溝の底面とを当接するように嵌着させ、軸スリーブを嵌装させたシャフト導下部を回転密封環と固定密封環およびシャフト貫通孔の各内周に遊嵌させた軸スリーブの外周に環状間隙を保有させ、上記固定密封環の直上においてシャフトと共に回転しバネ付勢により固定密封環と摺接するよう回転密封環をシャフトに嵌合させ、回転密封環と固定密封環の内周を同径とすると共にシャフト貫通孔内周径を該固定密封環内周と同径に形成し、該回転密封環と固定密封環およびシャフト貫通孔の各内周面に向けて外方へシャフトの回転方向に向って下り勾配として下端をポンプ室内に導延される撹拌ブレードを軸スリーブの外周面に突設した水中ポンプ軸封装置を提供する。
【０００７】
【実施例】
以下本発明の水中ポンプ軸封装置の実施例を、図１および図２と共に説明をする。
【０００８】
１はポンプ室２とオイル室３との間に介在する隔壁であり、中央に穿設されたシャフト貫通孔４の上端外側に環溝５を凹設して固定密封環支承用のハウジングを構成し、軸封装置の固定密封環６を上記環溝５内へ該固定密封環６の背端面と該環溝５の底面とを当接するように嵌着させる。７は原動機のシャフト導下部であり、オイル室３からポンプ室２へ亘る部位には軸スリーブ１４が嵌装されていて、該部位を回転密封環９と固定密封環６およびシャフト貫通孔４の各内周に遊嵌させた軸スリーブ１４の外周に環状間隙８を保有させる。
【０００９】
９は固定密封環６の直上において軸スリーブ１４の上端近くの外周へ遊嵌される回転密封環であり、ベローズ１０およびリテーナ１１を介してシャフトと共に回転するよう装着せられ、コイルスプリング１２のバネ付勢により固定密封環６と摺接される回転密封環９と固定密封環６の内周を同径とすると共にシャフト貫通孔４内周径を該固定密封環６内周と同径に形成する。軸スリーブ１４の外周面には上記回転密封環９と固定密封環６およびシャフト貫通孔４の各内周面に向けて外方へシャフトの回転方向に向って下り勾配として下端をポンプ室２内に導延される撹拌ブレード１３が突設されている。
【００１０】
【作用】
シャフトが回転して水中ポンプが駆動すれば、環状間隙８内の液体は回転密封環９と固定密封環６およびシャフト貫通孔４の各内周面に近接する撹拌ブレード１３により撹拌されて効率よくポンプ室２側へ押し出され、環状間隔８内に停留することがないので、液中の析出物が回転密封環９や固定密封環６やシャフト貫通孔４の各内周面に付着して堆積することを防止するのみでなく、冷却作用によって固形物の析出そのものを防止することになる。また、回転密封環９の組込み時にベローズ１０等付帯部材が損傷されることもない。
【００１１】
更に、上記撹拌ブレード１３の送水による冷却作用に加えて回転密封環９と固定密封環６との摺接面の摺動発熱が該固定密封環６の背端面と該環溝５の底面との当接面の熱伝導作用により低温側のポンプ室２の液へ吸熱させることで、より一層効率の良い冷却作用を発揮することができる。
【００１２】
【発明の効果】
本発明によれば、専用のシャフトを製作することを要せず汎用のシャフトを使用して強度を低下させることなく、ローコストで組立作業も容易に行われ、回転密封環９と固定密封環６およびシャフト貫通孔４の各内周とシャフト導下部７に嵌装された軸スリーブ１４の外周における環状間隙８内の液体を回転密封環９と固定密封環６およびシャフト貫通孔４の各内周面に近接する撹拌ブレード１３により撹拌され効率よくポンプ室２側へ押し出されることで停留を阻止すると共に冷却作用を生じ、析出物の堆積によるポンプの始動不良を来たすことがなく、固定密封環６と回転密封環９との摺接面間への上記析出物や液中の異物等の噛み込みによる面荒れや面開きを生じることもなく、シール性能が保持せられ、砂やスラリー等を含む液体に対してもシャフトの異常摩耗がなく、攪拌ブレード１３が摩耗すれば軸スリーブ１４のみを交換すれば足り、シャフト全体を交換する必要がなく、特に水中ポンプ用として好適な軸封装置が得られるという利点がある。
【００１３】
更に、上記撹拌ブレード１３の送水による冷却作用に前記熱伝導作用が相俟ることで回転密封環９と固定密封環６との摺接面の摺動発熱がより一層低く抑えられるため、上記析出物の発生抑制およびシール性能の安定に寄与するという効果も有している。
【図面の簡単な説明】
【図１】 本発明の水中ポンプ軸封装置の要部縦断側面図である。
【図２】 本発明装置における軸スリーブの底面図である。
【符号の説明】
１ 固定密封環支承用のハウジング
２ ポンプ室
４ シャフト貫通孔
５ 環溝
６ 固定密封環
７ シャフト導下部
８ 環状間隙
９ 回転密封環
１３ 撹拌ブレード
１４ 軸スリーブ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shaft seal device mounted on a submersible pump or the like.
[0002]
[Prior art and its problems]
As is well known, in a submersible pump, a shaft through hole is generally formed in the center of a partition wall interposed between a pump vortex chamber and an oil chamber, and an annular groove recessed in the outer periphery of the upper end of the through hole is provided in the submerged pump. A fixed seal ring of the shaft seal device is fitted, and an annular gap is held on the outer periphery of the shaft guide lower part that is loosely fitted in the fixed seal ring and the shaft through hole, and rotates with the shaft directly above the fixed seal ring and with a spring. The rotary seal ring is fitted to the shaft guide lower part so as to be in sliding contact with the fixed seal ring by the force, but the liquid retained in the annular gap precipitates solid matter due to sliding heat generation, and the precipitate is fixed. It adheres to the inner circumference of the seal ring and shaft through-hole, and it accumulates and causes the start failure of the pump, and the deposit is caught between the sliding contact surfaces of the fixed seal ring and the rotary seal ring. Sealing performance by causing roughing and face opening It will be inhibited. In order to solve such a problem, a spiral groove is engraved on the outer periphery of the shaft guide lower part, and there is an attempt to push the precipitate to the pump chamber side by the screw pump action accompanying the rotation of the shaft (for example, patent) Reference 1).
[0003]
[Patent Document 1]
JP 2000-274380 A (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in the structure of Patent Document 1, a general-purpose shaft cannot be used, and it is necessary to manufacture a dedicated one. Therefore, the cost is increased, and the strength of the shaft also remains a problem.
In addition, there is a difficulty in assembling that an accessory member such as an O-ring is easily damaged by the spiral groove when the rotary seal ring is assembled. Furthermore, according to the structure of Patent Document 1, it is suitable for use in a viscous liquid such as oil, but if used in a liquid containing sand or slurry as in a construction site, the shaft is used. The engraved spiral groove causes abnormal wear, which causes an early breakage of the shaft.
Further, the repair work associated with the wear of the spiral groove is a large repair of replacing the entire shaft, and requires a great repair cost.
[0005]
The present invention solves the above-mentioned problems, does not require the production of a dedicated shaft, uses a general-purpose shaft, does not reduce the strength, can be easily assembled at low cost, and is made of sand, slurry, etc. no abnormal wear of the shaft by, by stirring the fixed seal ring and the shaft through hole inner circumference and the shaft guide fitted at the bottom instrumentation is within the outer periphery of the annular gap of the shaft sleeve prevents retention of liquid, the deposition of precipitate The pump does not start poorly due to the above, and the sealing performance is maintained without causing surface roughening or surface opening due to biting of the above deposits or foreign matter in the liquid between the sliding contact surfaces. An object of the present invention is to provide a shaft seal device suitable for a pump.
[0006]
[Structure of the invention]
In the submersible pump shaft seal device according to the present invention, a ring groove is formed on the outer side of the upper end of the shaft through-hole to form a housing for supporting a fixed seal ring, and the fixed seal ring of the shaft seal device is inserted into the ring groove. The back end surface of the fixed seal ring and the bottom surface of the ring groove are fitted in contact with each other, and the shaft guide lower portion on which the shaft sleeve is fitted is allowed to play freely on the inner circumferences of the rotary seal ring, the fixed seal ring, and the shaft through hole. An annular gap is retained on the outer periphery of the fitted shaft sleeve, and the rotary seal ring is fitted to the shaft so as to rotate together with the shaft immediately above the fixed seal ring and slidably contact the fixed seal ring by spring bias. The inner diameter of the fixed seal ring is made the same diameter and the inner diameter of the shaft through hole is made the same diameter as the inner diameter of the fixed seal ring, and the inner circumference of each of the rotary seal ring, the fixed seal ring and the shaft through hole is formed. Facing down toward the direction of shaft rotation Stirring blades cast guiding the lower end in the pump chamber to provide a water pump shaft sealing device projecting from the outer peripheral surface of the shaft sleeve as.
[0007]
【Example】
An embodiment of the submersible pump shaft seal device of the present invention will be described below with reference to FIGS.
[0008]
Reference numeral 1 denotes a partition wall interposed between the pump chamber 2 and the oil chamber 3, and a ring groove 5 is formed outside the upper end of the shaft through hole 4 drilled in the center to constitute a housing for fixed sealing ring support. Then, the fixed sealing ring 6 of the shaft seal device is fitted into the ring groove 5 so that the back end surface of the fixed sealing ring 6 and the bottom surface of the ring groove 5 are in contact with each other. Reference numeral 7 denotes a shaft guide lower part of the prime mover, and a shaft sleeve 14 is fitted in a portion extending from the oil chamber 3 to the pump chamber 2, and this portion is connected to the rotary seal ring 9, the fixed seal ring 6 and the shaft through hole 4. An annular gap 8 is held on the outer periphery of the shaft sleeve 14 loosely fitted to each inner periphery.
[0009]
Reference numeral 9 denotes a rotary seal ring that is loosely fitted to the outer periphery near the upper end of the shaft sleeve 14 immediately above the fixed seal ring 6. The rotary seal ring 9 is mounted so as to rotate together with the shaft via the bellows 10 and the retainer 11. The inner circumference of the rotary seal ring 9 and the fixed seal ring 6 that are slidably contacted with the fixed seal ring 6 by biasing are made the same diameter, and the inner diameter of the shaft through-hole 4 is made the same diameter as the inner circumference of the fixed seal ring 6. To do. On the outer peripheral surface of the shaft sleeve 14, the lower end in the pump chamber 2 is inclined downward toward the rotational direction of the shaft toward the inner peripheral surfaces of the rotary seal ring 9, the fixed seal ring 6 and the shaft through hole 4. An agitating blade 13 is provided so as to be extended.
[00 10 ]
[Action]
When the shaft rotates and the submersible pump is driven, the liquid in the annular gap 8 is agitated by the agitating blades 13 adjacent to the inner peripheral surfaces of the rotary sealing ring 9, the fixed sealing ring 6 and the shaft through hole 4, and efficiently. Since it is pushed out to the pump chamber 2 side and does not stay within the annular interval 8, deposits in the liquid adhere to and accumulate on the inner peripheral surfaces of the rotary seal ring 9, the fixed seal ring 6 and the shaft through hole 4. In addition to preventing this, the cooling action prevents the solid matter from being precipitated. Further, the auxiliary member such as the bellows 10 is not damaged when the rotary seal ring 9 is assembled.
[0011]
Further, in addition to the cooling action of the agitating blade 13 due to the water supply, the sliding heat generation of the sliding contact surface between the rotary sealing ring 9 and the stationary sealing ring 6 causes the back end surface of the stationary sealing ring 6 and the bottom surface of the annular groove 5 to By making the liquid in the pump chamber 2 on the low temperature side absorb heat by the heat conduction action of the contact surface, a more efficient cooling action can be exhibited.
[00 12 ]
【The invention's effect】
According to the present invention, it is not necessary to manufacture a dedicated shaft, and a general-purpose shaft is used and the strength is not lowered, and the assembly work is easily performed at a low cost. In addition, the liquid in the annular gap 8 on the inner periphery of the shaft through-hole 4 and the outer periphery of the shaft sleeve 14 fitted to the shaft guide lower portion 7 allows the liquid in the rotary seal ring 9 and the fixed seal ring 6 and the inner periphery of the shaft through-hole 4 to Stirring is performed by the stirring blade 13 close to the surface and the pumping blade 2 is efficiently pushed out to the pump chamber 2 side to prevent the suspension and cause a cooling action. The seal performance is maintained without causing surface roughening or surface opening due to biting of the above-mentioned precipitates or foreign matter in the liquid between the sliding contact surfaces of the rotary seal ring 9 and the sand, slurry, etc. To liquid Even if there is no abnormal wear of the shaft, it is sufficient to replace only the shaft sleeve 14 if the stirring blade 13 is worn. There is no need to replace the entire shaft, and a shaft seal device suitable for an underwater pump can be obtained. There are advantages.
[0013]
Furthermore, since the heat conduction action is combined with the cooling action of the stirring blade 13 due to the water supply, the sliding heat generation on the sliding contact surface between the rotary seal ring 9 and the fixed seal ring 6 can be further suppressed, and thus the precipitation It also has the effect of contributing to the suppression of the generation of objects and the stability of sealing performance.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of an essential part of a submersible pump shaft seal device of the present invention.
FIG. 2 is a bottom view of a shaft sleeve in the device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing for fixed sealing ring support 2 Pump chamber 4 Shaft through-hole 5 Ring groove 6 Fixed sealing ring 7 Shaft guide lower part 8 Annular gap 9 Rotating sealing ring 13 Stirring blade 14 Shaft sleeve

Claims (1)

水中ポンプのシャフト貫通孔（４）の上端外側に環溝（５）を凹設して固定密封環支承用のハウジング（１）を構成し、軸封装置の固定密封環（６）を上記環溝（５）内へ該固定密封環（６）の背端面と該環溝（５）の底面とを当接するように嵌着させ、軸スリーブ（１４）を嵌装させたシャフト導下部（７）を回転密封環（９）と固定密封環（６）およびシャフト貫通孔（４）の各内周に遊嵌させた軸スリーブ（１４）の外周に環状間隙（８）を保有させ、上記固定密封環（６）の直上においてシャフトと共に回転しバネ付勢により固定密封環（６）と摺接するよう回転密封環（９）をシャフトに嵌合させ、回転密封環（９）と固定密封環（６）の内周を同径とすると共にシャフト貫通孔（４）内周径を該固定密封環（６）内周と同径に形成し、該回転密封環（９）と固定密封環（６）およびシャフト貫通孔（４）の各内周面に向けて外方へシャフトの回転方向に向って下り勾配として下端をポンプ室（２）内に導延される撹拌ブレード（１３）を軸スリーブ（１４）の外周面に突設したことを特徴とする水中ポンプ軸封装置。 A ring groove (5) is formed on the outer side of the upper end of the shaft through hole (4) of the submersible pump to form a housing (1) for fixed seal ring support, and the fixed seal ring (6) of the shaft seal device is connected to the above ring. The shaft guide lower part (7) in which the back end face of the fixed sealing ring (6) and the bottom face of the annular groove (5) are fitted into the groove (5) and the shaft sleeve (14) is fitted. ) Is held on the outer periphery of the shaft sleeve (14) loosely fitted on the inner periphery of each of the rotary seal ring (9), the fixed seal ring (6) and the shaft through hole (4), and the fixed The rotary seal ring (9) and the fixed seal ring (9) are fitted to the shaft so as to rotate together with the shaft immediately above the seal ring (6) and come into sliding contact with the fixed seal ring (6) by spring bias. The inner circumference of 6) has the same diameter and the shaft through hole (4) has the same inner diameter as the inner circumference of the stationary seal ring (6). The lower end of the rotary seal ring (9), the fixed seal ring (6), and the shaft through hole (4) is inclined downward toward the rotation direction of the shaft toward the inner peripheral surface of the pump chamber (2 ) A submerged pump shaft seal device characterized in that a stirring blade (13) led into the shaft sleeve (14) protrudes from the outer peripheral surface of the shaft sleeve (14).

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