JP2005207356A - Pump - Google Patents

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JP2005207356A
JP2005207356A JP2004016592A JP2004016592A JP2005207356A JP 2005207356 A JP2005207356 A JP 2005207356A JP 2004016592 A JP2004016592 A JP 2004016592A JP 2004016592 A JP2004016592 A JP 2004016592A JP 2005207356 A JP2005207356 A JP 2005207356A
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hole
end plate
impeller
pump
case end
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JP4606031B2 (en
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Joji Nakada
穣二 中田
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OGIHARA SEISAKUSHO KK
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OGIHARA SEISAKUSHO KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump that can suppress the water immersion to a vent hole even if leaked water is produced via a through-hole of an impeller case caused by a mechanical seal or an abnormality of the mechanical seal. <P>SOLUTION: The pump is provided with a relief groove 31 extending from a through-hole 3a toward nearly downward in an outer surface of a void 9 side in the middle part of an end plate of an impeller case 30 and keeps the outside diameter of a drain board 40 smaller than the hole diameter of the through-hole 3a. Also, the pump is provided with a first open ring-shaped anti-water 32 having a first drainage clearance 32a that is provided protruding so as to cover the outer perimeter of the drain board 40 in its outer surface and coincides with the position of an escape groove 31. The outside diameter of the first open ring-shaped anti-water 32 is made to be smaller than the inside diameter of a central recess 2c of the end plate of a motor case 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、メカニカルシールを用いたポンプに関し、特に、メカニカルシールの異常時における水漏れ対策に関する。   The present invention relates to a pump using a mechanical seal, and more particularly to measures against water leakage when the mechanical seal is abnormal.

図８は自吸式ポンプを示す側面図、図９は従来の自吸式ポンプの側面断面図、図１０（Ａ）は図９におけるポンプ側モータケースを示す正面図、図１０（Ｂ）は図９におけるインペラケースを示す背面図である。   8 is a side view showing a self-priming pump, FIG. 9 is a side sectional view of a conventional self-priming pump, FIG. 10 (A) is a front view showing a pump side motor case in FIG. 9, and FIG. It is a rear view which shows the impeller case in FIG.

従来の自吸式ポンプは、モータ１のポンプ側モータケース２の正面側端面に継ぎ合うインペラケース（ポンプケーシング）３と、そのインペラケース３の正面側端面に仕切板４及びゴムパッキン５を挟んで重ね合わせたポンプカバー（エンドケーシング）６とを有し、取付ボルトで相互連結した積層型構造となっている。モータ１のステータ１ａ及びロータ１ｂはポンプ側モータケース２と反ポンプ側モータケース７とで支持されている。ボールベアリング１ｃ，１ｄで軸承されたモータシャフト８の一端はインペラケース３側へ長く突出している。   The conventional self-priming pump has an impeller case (pump casing) 3 joined to the front side end surface of the pump side motor case 2 of the motor 1, and a partition plate 4 and a rubber packing 5 sandwiched between the front side end surfaces of the impeller case 3. It has a pump cover (end casing) 6 superposed on each other, and has a laminated structure interconnected with mounting bolts. The stator 1 a and the rotor 1 b of the motor 1 are supported by a pump side motor case 2 and an anti-pump side motor case 7. One end of the motor shaft 8 supported by the ball bearings 1c and 1d protrudes long toward the impeller case 3 side.

ポンプ側モータケース２の端板部は、モータシャフト８が貫通するための中央孔２ａと、この中央孔２ａの周りにモータ内部の空冷するための４つの長孔状通気口２ｂとを有し、その端板部の正面側（ポンプ側）の中央孔２ａの周囲には中央凹部２ｃが形成されていると共に、端板部の周縁側には空部９を空けてインペラケース３を支持するためのブラケット２ｄが一体的に形成されている。ポンプ側モータケース２の端板部の背面側にはボールベアリング１ｃの収納部を区画するための環状壁２ｅが一体的形成されている。なお、２ｆは開口である。   The end plate portion of the pump-side motor case 2 has a central hole 2a through which the motor shaft 8 passes, and four long hole-like vent holes 2b for cooling air inside the motor around the central hole 2a. A central recess 2c is formed around the central hole 2a on the front side (pump side) of the end plate portion, and the impeller case 3 is supported by leaving an empty portion 9 on the peripheral side of the end plate portion. A bracket 2d is integrally formed. On the back side of the end plate portion of the pump-side motor case 2, an annular wall 2e for partitioning the storage portion of the ball bearing 1c is integrally formed. 2f is an opening.

インペラケース３は、モータシャフト８が貫通するための貫通孔３ａとインペラ１１を収めるためのインペラ室３ｂとを有する。インペラケース３の端板中央部はモータケース２の端板部側に突出した２段絞り構造であって、その内部はメカニカルシール１１を内蔵するためのメカニカルシール収納部３ｃとなっている。メカニカルシール１０は、２段目絞り部３ｆ内に収められた固定環１１ａと、モータシャフト８の先端側に外嵌した防錆用インペラボス１２に嵌る回転環１１ｂとから成る。回転環１１ｂはコイルばね１３によりスラスト方向に弾力付勢されている。回転環１１ｂの固定環１１ａ側にはシールリングＡが位置し、固定環１１ａの回転環１１ｂ側にフローティングシートＢが位置し、シールリングＡとフローティングシートＢとの摺接部に流体膜が形成されて、インペラ室３ｂからの漏水を防止している。モータシャフト８の先端雄ねじ部はインペラ１０の円錐状央部にインサートしたインサートボス１０ａに螺着している。なお、３ｅは１段目絞り部３ｇとインペラケース３の周縁との間で径方向に肉付けしたリブである。   The impeller case 3 has a through hole 3a for the motor shaft 8 to pass therethrough and an impeller chamber 3b for accommodating the impeller 11. The central portion of the end plate of the impeller case 3 has a two-stage throttle structure protruding toward the end plate portion of the motor case 2, and the inside thereof is a mechanical seal housing portion 3 c for incorporating the mechanical seal 11. The mechanical seal 10 includes a stationary ring 11 a housed in the second-stage throttle portion 3 f and a rotating ring 11 b fitted to a rust-proof impeller boss 12 fitted on the front end side of the motor shaft 8. The rotating ring 11b is elastically biased by the coil spring 13 in the thrust direction. The seal ring A is positioned on the fixed ring 11a side of the rotating ring 11b, the floating sheet B is positioned on the rotating ring 11b side of the fixed ring 11a, and a fluid film is formed at the sliding contact portion between the seal ring A and the floating sheet B. Thus, water leakage from the impeller chamber 3b is prevented. The front male screw portion of the motor shaft 8 is screwed to an insert boss 10 a inserted in the conical central portion of the impeller 10. Reference numeral 3e denotes a rib that is thickened in the radial direction between the first-stage throttle portion 3g and the periphery of the impeller case 3.

メカニカルシール１１の構造・機能上、水漏れは皆無ではなく、ごく微量ながら水漏れが生じるものの、通例はインペラケース３内を滲むように伝う程度であるため、蒸発してしまうが、蒸発しきれない水漏れ量の対策として、モータシャフト８のポンプ側モータケース２とインペラケース３との間には水切り板１４が固定されている。この水切り板１４は貫通孔３ａを通るインペラボス１２の先端とモータシャフト８の段差部とに挟まれている。貫通孔３ａを介して水切り板１４に達した水は水切り板１４の遠心力によって飛散し、ブラケット２ｄ又はポンプ側モータケース２の端板部に付着した後、蒸発してしまうので、開口２ｆから外部への滴り落ちはない。   Due to the structure and function of the mechanical seal 11, there is no water leakage, and although there is a very small amount of water leakage, it usually evaporates because it is transmitted to the impeller case 3 so that it can evaporate. As a countermeasure against the amount of water leakage, a draining plate 14 is fixed between the pump-side motor case 2 and the impeller case 3 of the motor shaft 8. The draining plate 14 is sandwiched between the tip of the impeller boss 12 passing through the through hole 3 a and the step portion of the motor shaft 8. Since the water that has reached the draining plate 14 through the through hole 3a is scattered by the centrifugal force of the draining plate 14 and adheres to the bracket 2d or the end plate portion of the pump-side motor case 2, it evaporates from the opening 2f. There is no dripping outside.

ところが、万が一、メカニカルシール１１又はメカニカルシール取付け部に異常が生じた場合、多量の漏水が生じることから、この対策を講じる必要がある。   However, in the unlikely event that an abnormality occurs in the mechanical seal 11 or the mechanical seal mounting portion, a large amount of water leaks, so this countermeasure needs to be taken.

ここで漏水経路を検討すると、図１１（Ａ）に示す如く、インペラケース３の貫通孔３ａの孔面を伝って流れ出た水は回転する水切り板１４の外周縁側に触れると共に、図１１（Ｂ）に示す如く、インペラボス１２を伝って流れ出た水は水切り板１４の内周側まで達するため、水切り板１４に触れた水が遠心力によって外方向へ飛び散るので、ブラケット２ｄ又はポンプ側モータケース２の端板部に付着し、その端板部を伝って流れ下り、開口２ｆを介して外部へ排出される。しかし、その端板部を伝い下る過程では一部の漏水が通気口２ｂを介してモータ内部にまで浸入してしまい、モータの絶縁性能やボールベアリング１ｃの性能を損なう虞がある。   Examining the water leakage path here, as shown in FIG. 11 (A), the water flowing out through the hole surface of the through hole 3a of the impeller case 3 touches the outer peripheral side of the rotating draining plate 14, and FIG. ), The water flowing out through the impeller boss 12 reaches the inner peripheral side of the draining plate 14, so that the water that touched the draining plate 14 scatters outward due to centrifugal force, so that the bracket 2d or the pump side motor case 2 Is attached to the end plate portion, flows down along the end plate portion, and is discharged to the outside through the opening 2f. However, in the process of traveling down the end plate portion, some water leaks into the motor through the vent 2b, which may impair the insulation performance of the motor and the performance of the ball bearing 1c.

インペラボス１２の先端を水切り板１４に当てずに離し、水切り板１４をモータシャフト８に固定した場合でも、貫通孔３ａの孔面を伝って流れ出す漏水経路が問題となる。   Even when the tip of the impeller boss 12 is moved away from the draining plate 14 and the draining plate 14 is fixed to the motor shaft 8, the water leakage path that flows out through the hole surface of the through hole 3a becomes a problem.

そこで、上記問題点に鑑み、本発明の第１の課題は、万が一、インペラケースの貫通孔の孔面を伝って流れ出す漏水があっても、モータケース側の通気口への浸水を防止できるポンプを提供することにある。また、本発明の第２の課題は、万が一、モータシャフトを伝って流れ出す漏水があっても、モータケース側の通気口への浸水を防止できるポンプを提供することにある。   Accordingly, in view of the above problems, the first problem of the present invention is that a pump that can prevent water from entering the vent on the motor case side even if water leaks out through the hole surface of the through hole of the impeller case. Is to provide. A second object of the present invention is to provide a pump that can prevent water from entering the air vent on the motor case side even if water leaks out along the motor shaft.

先ず、本発明の第１の手段に係るポンプは、モータシャフトが貫通するための中央孔及びモータ内部を空冷するための通気口を備えたモータケース側端板部と、モータシャフトの先端側が貫通するための貫通孔を備えモータケース側端板部寄りに突出して内部にメカニカルシールを収めるインペラケース側端板中央部と、モータケース側端板部とインペラケース側端板中央部との間でモータシャフトに固定された水切り板と、モータケース側端板部とインペラケース側端板中央部との間に画成された空部の底側に連通する開口とを有する。   First, in the pump according to the first means of the present invention, a motor case side end plate portion provided with a central hole through which the motor shaft penetrates and a vent hole for air-cooling the inside of the motor, and a front end side of the motor shaft pass through. Between the impeller case side end plate center part and the motor case side end plate part, and the impeller case side end plate center part. A draining plate fixed to the motor shaft, and an opening communicating with the bottom side of the hollow portion defined between the motor case side end plate portion and the impeller case side end plate central portion.

そして、第１の課題を解決するために、本発明は、インペラケース側端板中央部の空部側の外面において貫通孔から略下方向に延びる逃がし溝を設けて成ることを特徴とする。   In order to solve the first problem, the present invention is characterized in that a relief groove extending substantially downward from the through hole is provided on the outer surface of the impeller case side end plate at the center of the hollow portion.

斯かる構成においては、万が一、インペラケースの貫通孔の孔面を伝って流れ出す漏水が発生しても、その水は逃がし溝を介して略下方向に流れ落ちるため、水の水切り板に触れる度合いが少なくなるので、水切り板による貫通孔の孔面からの漏水の飛散を低減でき、その分、通気口への浸水を抑制できる。   In such a configuration, even if water leaks out through the hole surface of the through hole of the impeller case, the water flows substantially downward through the escape groove, so the degree of touching the water draining plate is low. Since it decreases, the scattering of the water leakage from the hole surface of the through-hole by a draining board can be reduced, and the flooding to a vent can be suppressed by that much.

また、水切り板の外径が貫通孔の孔径よりも小さい場合には、流れ落ちる水の水切り板に触れる度合いが少なくなるので、水切り板による貫通孔の孔面からの漏水の飛散を低減でき、その分、通気口への浸水を抑制できる。   In addition, when the outer diameter of the draining plate is smaller than the hole diameter of the through hole, the degree of contact with the draining plate of the water that flows down is reduced, so that scattering of water leakage from the hole surface of the through hole by the draining plate can be reduced. Minutes and water entry into the vent can be suppressed.

ここで、水切り板の外径を小さくする程、また逃がし溝の流断面を大きくする程、貫通孔の孔面を伝って流れ出す水が水切り板に当たる度合いを低減できるものであるが、前者の場合、モータシャフトを伝って漏水する水を水切り板の遠心力で飛散させる作用が弱まることになるため、水切り板の外径の小径化には限界があるので、モータシャフトの外径（その先端側にインペラボスが外嵌する場合はそのインペラボスの外径）と貫通孔の孔径との略中間であることが望ましい。   Here, the smaller the outer diameter of the draining plate and the larger the flow cross-section of the escape groove, the more the water flowing out through the hole surface of the through hole can be reduced to the draining plate. Since the action of scattering the water leaking through the motor shaft by the centrifugal force of the draining plate is weakened, there is a limit to reducing the outer diameter of the draining plate. When the impeller boss is externally fitted, the outer diameter of the impeller boss) and the hole diameter of the through hole are preferably approximately in the middle.

第２の課題を解決するため、本発明は、インペラケース側端板中央部の空部側の外面において水切り板の外周を覆うように突設し、逃がし溝の位置に略合致する第１の水抜き隙間を有する第１の開環状水避けを備えて成る。   In order to solve the second problem, according to the present invention, a first projecting projection is provided so as to cover the outer periphery of the draining plate on the outer surface of the hollow portion of the impeller case side end plate central portion, and substantially matches the position of the escape groove. Comprising a first open annular water avoidance with a drain gap.

斯かる構成においては、万が一、モータシャフトを伝って流れ出す漏水が発生しても、水切り板の遠心力で飛散した水が第１の開環状水避けよって遮られるため、第１の開環状水避けの第１の水抜き隙間を介して略下方向に流れ落ちので、通気口への浸水を抑制できる。また、貫通孔の孔面を伝って流れ出す水が逃がし溝で全部排水できずに、一部が水切り板に触れても、これが第１の開環状水避けの第１の水抜き隙間を介して略下方向に流れ落ちので、通気口への浸水を抑制できる。   In such a configuration, even if water leaks out through the motor shaft, the water scattered by the centrifugal force of the draining plate is blocked by the first open ring water avoidance, so the first open ring water avoidance is avoided. Since it flows down substantially downward through the first drain gap, it is possible to suppress water from entering the vent. Moreover, even if a part of the water that flows out through the hole surface of the through-hole escapes to the drainage groove and touches the draining plate, this may pass through the first drain gap to avoid the first open annular water. Since it flows down substantially downward, it is possible to suppress water from entering the vent.

ここで万が一、インペラケース内の圧力が異常高圧となった場合、第１の開環状水避けがモータケース側端板部寄りへ多少変形してこれに当たり、第１の開環状水避けとモータケース側端板部との隙間を介した水抜き効果が減じる虞がある。そこで、モータケース側端板部の空部側の外面において中央孔の周囲に中央凹部を形成し、第１の開環状水避けの外径を中央凹部の内径よりも小径とする。異常圧力の際でも第１の開環状水避けが中央凹部内に入り込むため、モータケース側端板部に当たり難くなり、第１の開環状水避けとモータケース側端板部との隙間を確保でき、異常圧力時の水抜き効果の低減を抑制できる。また、水切り板の外周を第１の開環状水避けと中央凹部の内周面とでオーバーラップ的ないし２重遮蔽的に覆うこともでき、その分、通気口への浸水を抑制できる。しかも、モータケースとインペラケースとの離間距離を長くせずに済む。   If the pressure in the impeller case becomes abnormally high, the first avoidance of the open annular water is slightly deformed toward the end plate of the motor case side. There is a possibility that the effect of draining water through the gap with the side end plate portion may be reduced. Therefore, a central recess is formed around the center hole on the outer surface of the motor case side end plate portion around the center hole, and the outer diameter to avoid the first open annular water is made smaller than the inner diameter of the center recess. Even when the pressure is abnormal, the first avoidance of the open annular water enters the central recess, making it difficult to hit the end plate of the motor case side, and the clearance between the avoidance of the first open annular water and the end case of the motor case side can be secured. The reduction of the draining effect at the time of abnormal pressure can be suppressed. Moreover, the outer periphery of the draining plate can be covered in an overlapping manner or a double shielding manner by avoiding the first open annular water and the inner peripheral surface of the central recess, and accordingly, water infiltration into the vent can be suppressed. In addition, it is not necessary to increase the distance between the motor case and the impeller case.

また、モータシャフトの先端側に外嵌するインペラボスの先端が水切り板に当接しており、インペラボスは先細状に形成されている場合には、先細状のインペラボスでは先端になるにつれ遠心力が漸減するため、インペラボスを伝って流れ出す水が水切り板に到達し難くなるので、水切り板からの飛散自体を抑制できる。また、インペラボスは先細状であるため、ポンプ組立て時においてメカニカルシールの回転環を装着し易くなる。   In addition, when the impeller boss that is externally fitted to the tip end of the motor shaft is in contact with the draining plate, and the impeller boss is formed in a tapered shape, the centrifugal force gradually decreases as the tip of the tapered impeller boss becomes the tip. Therefore, since the water flowing out through Impellers hardly reaches the draining plate, it is possible to suppress scattering itself from the draining plate. Further, since the impeller boss is tapered, it becomes easy to mount the rotating ring of the mechanical seal when the pump is assembled.

本発明の第２の手段に係るポンプも、モータシャフトが貫通するための中央孔及びモータ内部を空冷するための通気口を備えたモータケース側端板部と、モータシャフトの先端側が貫通するための貫通孔を備えモータケース側端板部寄に突出して内部にメカニカルシールを収めるインペラケース側端板中央部と、モータケース側端板部とインペラケース側端板中央部との間でモータシャフトに固定された水切り板と、モータケース側端板部とインペラケース側端板中央部との間に画成された空部の底側に連通する開口とを有する。   The pump according to the second means of the present invention also has a motor case side end plate portion provided with a central hole through which the motor shaft penetrates and a vent hole for air-cooling the inside of the motor, and the tip end side of the motor shaft penetrates. A motor shaft between the impeller case side end plate center portion that protrudes toward the motor case side end plate portion and houses the mechanical seal therein, and the motor case side end plate portion and the impeller case side end plate center portion. And an opening communicating with the bottom side of the empty space defined between the motor case side end plate portion and the impeller case side end plate central portion.

そして、第１及び第２の課題を解決するために、本発明は、モータケース側端板部の空部側の外面のうち通気口の内周側において水切り板の外周を覆うように突設して中央凹部を形成し、中央凹部から略下方向に配向する第２の水抜き隙間を有する第２の開環状水避けを備えて成ることを特徴とする。   In order to solve the first and second problems, the present invention is provided so as to cover the outer periphery of the draining plate on the inner peripheral side of the vent hole on the outer surface on the empty side of the end plate portion on the motor case side. And forming a central recess, and a second open-circular water avoidance having a second drainage gap oriented substantially downward from the central recess.

斯かる構成においては、万が一、インペラケースの貫通孔の孔面を伝って流れ出す漏水が発生し、またモータシャフトを伝って流れ出す漏水が発生した場合、漏水の水切り板による飛散が第２の開環状水避けよって遮られて第２の水抜き隙間から流れ落ちるため、通気口への浸水を抑制できる。   In such a configuration, in the unlikely event that water leaks out through the hole surface of the through hole of the impeller case, and water leaks out through the motor shaft, splashing by the water draining plate is caused by the second open ring. Since it is blocked by the avoidance of water and flows down from the second drainage gap, it is possible to prevent water from entering the vent.

メカニカルシール又はメカニカルシールの異常によりインペラケースの貫通孔を介した漏水が発生しても、通気口への浸水を抑制できるため、モータの絶縁性能や軸受けの性能が損なわれるのを防ぐことができる。   Even if water leaks through the through-hole of the impeller case due to a mechanical seal or mechanical seal abnormality, it is possible to prevent water from entering the vent hole, thus preventing the motor insulation performance and bearing performance from being impaired. .

次に、本発明の実施形態を添付図面に基づいて説明する。   Next, embodiments of the present invention will be described with reference to the accompanying drawings.

図１は本発明の実施例１に係る自吸式ポンプの側面断面図、図２（Ａ）は同自吸式ポンプにおけるインペラケースを示す背面図、図２（Ｂ）はその側面断面図である。   1 is a side sectional view of a self-priming pump according to a first embodiment of the present invention, FIG. 2 (A) is a rear view showing an impeller case in the self-priming pump, and FIG. 2 (B) is a side sectional view thereof. is there.

本例の自吸式ポンプも、従来の自吸式ポンプと同様に、モータ１のポンプ側モータケース２の正面側端面に継ぎ合うインペラケース（ポンプケーシング）３０と、そのインペラケース３０の正面側端面に仕切板４及びゴムパッキン５を挟んで重ね合わせたポンプカバー（エンドケーシング）６とを有し、取付ボルトで相互連結した積層型構造となっている。モータ１のステータ１ａ及びロータ１ｂはポンプ側モータケース２と反ポンプ側モータケース７とで支持されている。ボールベアリング１ｃ，１ｄで軸承されたモータシャフト８の一端はインペラケース３０側へ長く突出している。   Similarly to the conventional self-priming pump, the self-priming pump of this example also has an impeller case (pump casing) 30 joined to the front end surface of the pump-side motor case 2 of the motor 1 and the front side of the impeller case 30. The end surface has a pump cover (end casing) 6 that is overlapped with the partition plate 4 and the rubber packing 5 sandwiched therebetween, and has a laminated structure in which they are interconnected with mounting bolts. The stator 1 a and the rotor 1 b of the motor 1 are supported by a pump side motor case 2 and an anti-pump side motor case 7. One end of the motor shaft 8 supported by the ball bearings 1c and 1d protrudes long toward the impeller case 30 side.

ポンプ側モータケース２の端板部は、モータシャフト８が貫通するための中央孔２ａと、この中央孔２ａの周りにモータ内部の空冷するための４つの長孔状通気口２ｂとを有し、その端板部の正面側（ポンプ側）の中央孔２ａの周囲には中央凹部２ｃが形成されていると共に、端板部の周縁側には空部９を空けてインペラケース３を支持するためのブラケット２ｄが一体的に形成されている。ポンプ側モータケース２の端板部の背面側にはボールベアリング１ｄの収納部を区画するための環状壁２ｅが一体的形成されている。なお、２ｆは通気又は水抜き用の開口である。   The end plate portion of the pump-side motor case 2 has a central hole 2a through which the motor shaft 8 passes, and four long hole-like vent holes 2b for cooling air inside the motor around the central hole 2a. A central recess 2c is formed around the central hole 2a on the front side (pump side) of the end plate portion, and the impeller case 3 is supported by leaving an empty portion 9 on the peripheral side of the end plate portion. A bracket 2d is integrally formed. On the back side of the end plate portion of the pump-side motor case 2, an annular wall 2e for defining a storage portion for the ball bearing 1d is integrally formed. 2f is an opening for venting or draining water.

インペラケース３０は、モータシャフト８が貫通するための貫通孔３ａとインペラ１１を収めるためのインペラ室３ｂとを有する。インペラケース３の端板中央部はモータケース２の端板部側に突出した２段絞り構造であって、その内部はメカニカルシール１１を内蔵するメカニカルシール収納部３ｃとなっている。メカニカルシール１０は、２段目絞り部３ｆ内に収められた固定環１１ａと、モータシャフト８の先端側に外嵌した先細状の防錆用インペラボス２０に嵌る回転環１１ｂとから成る。回転環１１ｂはコイルばね１３によりスラスト方向に弾力付勢されている。回転環１１ｂの固定環１１ａ側にはシールリングＡが位置し、固定環１１ａの回転環１１ｂ側にフローティングシートＢが位置し、シールリングＡとフローティングシートＢとの摺接部に流体膜が形成されて、インペラ室３ｂからの漏水を防止している。モータシャフト８の先端雄ねじ部はインペラ１０の円錐状央部にインサートしたインサートボス１０ａに螺着している。なお、３ｅは１段目絞り部３ｇとインペラケース３の周縁との間で径方向に肉付けしたリブである。   The impeller case 30 has a through hole 3a through which the motor shaft 8 passes and an impeller chamber 3b in which the impeller 11 is stored. The central portion of the end plate of the impeller case 3 has a two-stage throttle structure that protrudes toward the end plate portion of the motor case 2, and the inside thereof is a mechanical seal housing portion 3 c in which a mechanical seal 11 is incorporated. The mechanical seal 10 includes a stationary ring 11a housed in the second-stage throttle portion 3f, and a rotating ring 11b fitted to a tapered rust-proof impeller boss 20 fitted on the front end side of the motor shaft 8. The rotating ring 11b is elastically biased by the coil spring 13 in the thrust direction. The seal ring A is positioned on the fixed ring 11a side of the rotating ring 11b, the floating sheet B is positioned on the rotating ring 11b side of the fixed ring 11a, and a fluid film is formed at the sliding contact portion between the seal ring A and the floating sheet B. Thus, water leakage from the impeller chamber 3b is prevented. The front male screw portion of the motor shaft 8 is screwed to an insert boss 10 a inserted in the conical central portion of the impeller 10. Reference numeral 3e denotes a rib that is thickened in the radial direction between the first-stage throttle portion 3g and the periphery of the impeller case 3.

図２に示す如く、インペラケース３０の端板中央部である２段目絞り部３ｆの空部９側の外面において、貫通孔３ａから略下方向に延びる逃がし溝３１が形成されている。また、２段目絞り部３ｆの空部９側の外面において、水切り板４０の外周を覆う第１の開環状水避け３２が一体的に突設している。この第１の開環状水避け３２は逃がし溝３１の位置に略合致する第１の水抜き隙間３２ａを有する。水切り板４０はモータシャフト８の段差部と先細状のインペラボス２０とに挟まれて固定されている。水切り板４０の外径は貫通孔３ａの孔径よりも小径であって、インペラボス２０の外径と貫通孔３ａの孔径との略中間である。第１の開環状水避け３２の外径は中央凹部２ｃの内径よりも小径となっている。   As shown in FIG. 2, a relief groove 31 extending substantially downward from the through hole 3 a is formed on the outer surface of the second stage throttle portion 3 f that is the center portion of the end plate of the impeller case 30 on the empty portion 9 side. In addition, a first open annular water avoidance 32 that covers the outer periphery of the draining plate 40 protrudes integrally on the outer surface of the second stage throttle portion 3f on the empty portion 9 side. The first open annular water avoidance 32 has a first drain gap 32 a that substantially matches the position of the escape groove 31. The draining plate 40 is sandwiched and fixed between the stepped portion of the motor shaft 8 and the tapered impeller boss 20. The outer diameter of the draining plate 40 is smaller than the diameter of the through-hole 3a, and is approximately between the outer diameter of the impeller boss 20 and the diameter of the through-hole 3a. The outer diameter of the first open annular water avoidance 32 is smaller than the inner diameter of the central recess 2c.

このような貫通孔３ａの周囲構造においては、図３に示す如く、万が一、インペラケース３０の貫通孔３ａの孔面を伝って流れ出す漏水が発生しても、その水は逃がし溝３１を介して略下方向に伝い下り、また水切り板４０の外径が貫通孔３ａの孔径よりも小さいため、流れ落ちる水は水切り板４０に触れ難くなり、水切り板４０による貫通孔３ａの孔面からの漏水の飛散を低減でき、その分、通気口２ｂへの浸水を抑制できる。   In such a surrounding structure of the through-hole 3a, as shown in FIG. 3, even if water leaks out through the hole surface of the through-hole 3a of the impeller case 30, the water passes through the escape groove 31. Since the outer diameter of the draining plate 40 is smaller than the hole diameter of the through hole 3a, it is difficult for the water that flows down to touch the draining plate 40, and water leaks from the hole surface of the through hole 3a by the draining plate 40. Spattering can be reduced, and the amount of water entering the vent 2b can be suppressed accordingly.

また、図４に示す如く、万が一、インペラボス２０を伝って流れ出す漏水が発生しても、水切り板４０の遠心力で飛散した水が第１の開環状水避け３２よって遮られるため、第１の開環状水避け３２の第１の水抜き隙間３２ａを介して略下方向に流れ落ちので、通気口２ｂへの浸水を抑制できる。しかも、貫通孔３ａの孔面を伝って流れ出す水が逃がし溝３１で全部排水できずに、一部が水切り板に触れても、これが第１の開環状水避け３２の第１の水抜き隙間３２ａを介して略下方向に流れ落ちので、通気口２ｂへの浸水を抑制できる。   In addition, as shown in FIG. 4, even if water leaks out through the impeller boss 20, water scattered by the centrifugal force of the draining plate 40 is blocked by the first open annular water avoidance 32. Since it flows down substantially downward through the first drain gap 32a of the open annular water avoidance 32, it is possible to suppress water intrusion into the vent 2b. Moreover, even if the water flowing out through the hole surface of the through-hole 3a cannot be drained completely by the escape groove 31 and partly touches the draining plate, this is the first drain gap of the first open annular water avoidance 32. Since it flows down substantially downwards through 32a, the inundation to the vent 2b can be suppressed.

インペラケース内の圧力が異常高圧となった場合、第１の開環状水避け３２がモータケース２の端板部寄りへ多少変形してこれに当たり、第１の開環状水避け３２とモータケース２の端板部との隙間を介した水抜き効果が減じる虞があるものの、第１の開環状水避け３２の外径が中央凹部２ｃの内径よりも小径となっているため、異常圧力の際でも第１の開環状水避け３２が中央凹部２ｃ内に入り込むので、モータケース２の端板部に当たり難くなり、第１の開環状水避け３２とモータケース２の端板部との隙間を確保でき、異常圧力時の水抜き効果の低減を抑制できる。   When the pressure in the impeller case becomes abnormally high, the first open annular water avoidance 32 is slightly deformed toward the end plate portion of the motor case 2 and hits the first open annular water avoidance 32 and the motor case 2. Although there is a possibility that the draining effect through the gap with the end plate portion may be reduced, the outer diameter of the first open annular water avoidance 32 is smaller than the inner diameter of the central recess 2c. However, since the first open annular water avoidance 32 enters the central recess 2c, it is difficult to hit the end plate portion of the motor case 2, and a clearance between the first open annular water avoidance 32 and the end plate portion of the motor case 2 is secured. It is possible to suppress the reduction of the draining effect at the time of abnormal pressure.

更に、水切り板４０の外周を第１の開環状水避け３２と中央凹部２ｃの内周面とでオーバーラップ的ないし２重遮蔽的に覆うこともでき、その分、通気口２ｂへの浸水を抑制できる。しかも、モータケース２とインペラケース３０との離間距離を長くせずに済む。   Further, the outer periphery of the draining plate 40 can be covered in an overlapping or double shielding manner by the first open annular water avoidance 32 and the inner peripheral surface of the central recess 2c. Can be suppressed. In addition, it is not necessary to increase the distance between the motor case 2 and the impeller case 30.

インペラボス２０は先細状であるため、インペラボス２０では先端になるにつれ遠心力が漸減するので、インペラボス２０を伝って流れ出す水が水切り板４０に到達し難くなり、水切り板４０からの飛散自体を抑制できる。しかも、先細状のインペラボス２０を用いると、ポンプ組立て時においてメカニカルシール１１の回転環１１ｂを装着し易くなる。   Since the impeller boss 20 is tapered, the centrifugal force gradually decreases as the impeller boss 20 reaches the tip, so that the water flowing through the impeller boss 20 does not easily reach the draining plate 40, and scattering from the draining plate 40 itself can be suppressed. . Moreover, when the tapered impeller boss 20 is used, it is easy to mount the rotating ring 11b of the mechanical seal 11 when the pump is assembled.

図５は本発明の実施例２に係る自吸式ポンプの側面断面図、図６（Ａ）は実施例２におけるモータケースを示す側面断面図、図６（Ｂ）はその正面図である。なお、図５及び図６において、図１又は図９に示す部分と同一部分には同一参照符号を付し、その説明を省略する。   5 is a side sectional view of a self-priming pump according to Embodiment 2 of the present invention, FIG. 6A is a side sectional view showing a motor case in Embodiment 2, and FIG. 6B is a front view thereof. 5 and 6, the same parts as those shown in FIG. 1 or 9 are denoted by the same reference numerals, and the description thereof is omitted.

本例のモータケース２の端板部において、空部９側の外面のうち通気口２ｂの内周側には、水切り板１４の外周を覆う第２の開環状水避け５０が一体的に突設している。この第２の開環状水避け５０は中央凹部２ｃから略下方向に配向する絞り状の第２の水抜き隙間５０ａを有する。従って、各通気口２ｂの開口縁は外側よりも内側の方が空部９側に突出しており、第２の開環状水避け５０内に従来よりも深い中央凹部２ｃが画成されている。   In the end plate portion of the motor case 2 of the present example, a second open annular water avoidance 50 covering the outer periphery of the draining plate 14 integrally projects on the inner peripheral side of the vent hole 2b in the outer surface on the empty portion 9 side. Has been established. This second open-circular water avoidance 50 has a drawn-shaped second drain gap 50a that is oriented substantially downward from the central recess 2c. Therefore, the opening edge of each vent 2b protrudes toward the empty portion 9 from the inside to the outside, and a central recess 2c deeper than the conventional one is defined in the second open-circular water avoidance 50.

このような構成においては、図７に示す如く、万が一、インペラケース３の貫通孔３ａの孔縁を伝って流れ出す漏水が発生し、またインペラボス１２を伝って流れ出す漏水が発生した場合、漏水の水切り板１４による飛散が第２の開環状水避け５０よって遮られて第２の水抜き隙間５０ａから流れ落ちるため、通気口２ｂへの浸水を抑制できる。この第２の開環状水避け５０はボールベアリング１ｄを収めるための環状壁２ｅを空部９側に突出させて形成すれば済むため、モータケース２の成形型の修正だけで済み、低コスト化を図ることができる。   In such a configuration, as shown in FIG. 7, in the unlikely event that water leaks out through the edge of the through hole 3 a of the impeller case 3 and water leaks out through the impeller boss 12, Since scattering by the plate 14 is blocked by the second open annular water avoidance 50 and flows down from the second drain gap 50a, it is possible to prevent water from entering the vent 2b. Since this second open annular water avoidance 50 only needs to be formed by projecting the annular wall 2e for accommodating the ball bearing 1d toward the hollow portion 9, it is only necessary to modify the mold of the motor case 2, thereby reducing the cost. Can be achieved.

なお、実施例１と実施例２とを合せた構造とし、水切り板４０の外周を内側の第１の開環状水避け３２と外側の第２の開環状水避け５０とで２重に囲む構造としても良い。   In addition, it is set as the structure which combined Example 1 and Example 2, and the outer periphery of the draining board 40 is enclosed with the 1st open ring water avoidance 32 inside and the 2nd open ring water avoidance 50 outside. It is also good.

本発明の実施例１に係る自吸式ポンプの側面断面図である。It is side surface sectional drawing of the self-priming pump which concerns on Example 1 of this invention. （Ａ）は実施例１におけるインペラケースを示す背面図、（Ｂ）はその側面断面図である。(A) is the rear view which shows the impeller case in Example 1, (B) is the side sectional drawing. （Ａ）は実施例１においてインペラケースの貫通孔の孔面を伝って流れ出す漏水態様を示す側面断面図、図３（Ｂ）は（Ａ）中のＡ−Ａ′線で切断した状態を示す矢視図である。(A) is side surface sectional drawing which shows the water leakage aspect which flows out through the hole surface of the through-hole of an impeller case in Example 1, FIG.3 (B) shows the state cut | disconnected by the AA 'line in (A). It is an arrow view. （Ａ）は実施例１においてインペラボスを伝って流れ出す漏水態様を示す側面断面図、（Ｂ）は図４（Ａ）中のＡ−Ａ′線で切断した状態を示す矢視図である。(A) is side surface sectional drawing which shows the water leakage aspect which flows out through impeller boss in Example 1, (B) is an arrow line view which shows the state cut | disconnected by the AA 'line in FIG. 4 (A). 本発明の実施例２に係る自吸式ポンプの側面断面図である。It is side surface sectional drawing of the self-priming pump which concerns on Example 2 of this invention. （Ａ）は実施例２におけるモータケースを示す側面断面図、（Ｂ）はその正面図である。(A) is side sectional drawing which shows the motor case in Example 2, (B) is the front view. （Ａ）は実施例２においてインペラケースの貫通孔を介して流れ出す漏水態様を示す側面断面図、図７（Ｂ）は（Ａ）中のＡ−Ａ′線で切断した状態を示す矢視図である。(A) is side surface sectional drawing which shows the water leakage aspect which flows out through the through-hole of an impeller case in Example 2, FIG.7 (B) is an arrow line view which shows the state cut | disconnected by the AA 'line in (A). It is. 自吸式ポンプを示す側面図である。It is a side view which shows a self-priming pump. 従来の自吸式ポンプの側面断面図である。It is side surface sectional drawing of the conventional self-priming pump. （Ａ）は図９におけるポンプ側モータケースを示す正面図、（Ｂ）は図９におけるインペラケースを示す背面図である。(A) is a front view which shows the pump side motor case in FIG. 9, (B) is a rear view which shows the impeller case in FIG. （Ａ）は従来の自吸式ポンプにおいてインペラケースの貫通孔の孔面を伝って流れ出す漏水態様を示す側面断面図、（Ｂ）は従来の自吸式ポンプにおいてインペラボスを伝って流れ出す漏水態様を示す側面断面図である。(A) is side surface sectional drawing which shows the water leakage aspect which flows out through the hole surface of the through-hole of an impeller case in the conventional self-priming pump, (B) is the water leakage aspect which flows out through Impellers in the conventional self-priming pump. It is side surface sectional drawing shown.

符号の説明Explanation of symbols

１…モータ
１ａ…ステータ
１ｂ…ロータ
１ｃ，１ｄ…ボールベアリング
２…ポンプ側モータケース
２ａ…中央孔
２ｂ…長孔状通気口
２ｃ…中央凹部
２ｄ…ブラケット
２ｅ…環状壁
２ｆ…通気又は水抜き用の開口
３，３０…インペラケース（ポンプケーシング）
３ａ…貫通孔
３ｂ…インペラ室
３ｃ…メカニカルシール収納部
３ｅ…リブ
３ｆ…２段目絞り部
３ｇ…１段目絞り部
４…仕切板
５…ゴムパッキン
６…ポンプカバー（エンドケーシング）
７…反ポンプ側モータケース
８…モータシャフト
９…空部
１０…インペラ
１０ａ…インサートボス
１１ａ…固定環
１１ｂ…回転環
１２，２０…防錆用インペラボス
１３…コイルばね
１４，４０…水切り板
３１…逃がし溝
３２…第１の開環状水避け
３２ａ…第１の水抜き隙間
５０…第２の開環状水避け
５０ａ…第２の水抜き隙間
Ａ…シールリング
Ｂ…フローティングシート DESCRIPTION OF SYMBOLS 1 ... Motor 1a ... Stator 1b ... Rotor 1c, 1d ... Ball bearing 2 ... Pump side motor case 2a ... Central hole 2b ... Long hole-shaped vent 2c ... Central recessed part 2d ... Bracket 2e ... Annular wall 2f ... For ventilation or drainage Opening 3,30 ... impeller case (pump casing)
3a ... Through-hole 3b ... Impeller chamber 3c ... Mechanical seal housing 3e ... Rib 3f ... Second stage throttle 3g ... First stage throttle 4 ... Partition plate 5 ... Rubber packing 6 ... Pump cover (end casing)
7 ... Anti-pump side motor case 8 ... Motor shaft 9 ... Empty portion 10 ... Impeller 10a ... Insert boss 11a ... Fixed ring 11b ... Rotating ring 12, 20 ... Rust impeller 13 ... Coil springs 14, 40 ... Drain plate 31 ... Relief groove 32 ... first open annular water avoidance 32a ... first drain clearance 50 ... second open annular avoidance 50a ... second drain clearance A ... sealing ring B ... floating sheet

Claims (7)

モータシャフトが貫通するための中央孔及びモータ内部を空冷するための通気口を備えたモータケース端板部と、前記モータシャフトの先端側が貫通するための貫通孔を備え前記モータケース端板部側に突出して内部にメカニカルシールを収めるインペラケース端板中央部と、前記モータケース端板部と前記インペラケース端板中央部との間で前記モータシャフトに固定された水切り板と、前記モータケース端板部と前記インペラケース端板中央部との間に画成された空部の底側に連通する開口とを有するポンプであって、
前記インペラケース端板中央部の前記空部側の外面において、前記貫通孔から略下方向に延びる逃がし溝を設けて成ることを特徴とするポンプ。 A motor case end plate portion provided with a central hole for the motor shaft to penetrate and a vent hole for air-cooling the inside of the motor, and a motor case end plate portion side provided with a through hole for the front end side of the motor shaft to pass through An impeller case end plate central portion that protrudes into the housing and houses a mechanical seal therein, a drainer plate fixed to the motor shaft between the motor case end plate portion and the impeller case end plate central portion, and the motor case end A pump having an opening communicating with a bottom side of an empty portion defined between a plate portion and a central portion of the impeller case end plate,
A pump characterized in that an escape groove extending substantially downward from the through hole is provided on the outer surface of the impeller case end plate at the center of the hollow portion. 前記水切り板の外径を前記貫通孔の孔径よりも小径として成ることを特徴とする請求項１に記載のポンプ。 The pump according to claim 1, wherein an outer diameter of the draining plate is smaller than a diameter of the through hole. 前記水切り板の外径が前記モータシャフトの外径と前記貫通孔の孔径との略中間であることを特徴とする請求項１又は請求項２に記載のポンプ。 3. The pump according to claim 1, wherein an outer diameter of the draining plate is substantially intermediate between an outer diameter of the motor shaft and a diameter of the through hole. 前記インペラケース端板中央部の前記空部側の外面において前記水切り板の外周を覆うように突設し、前記逃がし溝の位置に略合致する第１の水抜き隙間を有する第１の開環状水避けを備えて成ることを特徴とする請求項１乃至請求項３のいずれか一項に記載のポンプ。 A first open ring having a first drainage gap projecting so as to cover the outer periphery of the draining plate on the outer surface of the hollow portion side of the center portion of the impeller case end plate and substantially matching the position of the escape groove The pump according to any one of claims 1 to 3, wherein the pump is provided with water avoidance. 前記モータケース端板部の前記空部側の外面において前記中央孔の周囲に中央凹部を形成し、前記第１の開環状水避けの外径を前記中央凹部の内径よりも小径として成ることを特徴とする請求項１乃至請求項４のいずれか一項に記載のポンプ。 A central concave portion is formed around the central hole on the outer surface of the motor case end plate portion around the hollow portion, and an outer diameter for avoiding the first open annular water is smaller than an inner diameter of the central concave portion. The pump according to any one of claims 1 to 4, wherein the pump is characterized. 前記モータシャフトの先端側に外嵌するインペラボスの先端が前記水切り板に当接しており、前記インペラボスは先細状に形成されていることを特徴とする請求項１乃至請求項５のいずれか一項に記載のポンプ。 6. The impeller boss externally fitted to the tip end side of the motor shaft is in contact with the draining plate, and the impeller boss is formed in a tapered shape. 6. The pump described in. モータシャフトが貫通するための中央孔及びモータ内部を空冷するための通気口を備えたモータケース端板部と、前記モータシャフトの先端側が貫通するための貫通孔を備え前記モータケース端板部側に突出して内部にメカニカルシールを収めるインペラケース端板中央部と、前記モータケース端板部と前記インペラケース端板中央部との間で前記モータシャフトに固定された水切り板と、前記モータケース端板部と前記インペラケース端板中央部との間に画成された空部の底側に連通する開口とを有するポンプであって、
前記モータケース端板部の前記空部側の外面のうち前記通気口の内周側において前記水切り板の外周を覆うように突設して中央凹部を形成し、前記中央凹部から前記略下方向に配向する第２の水抜き隙間を有する第２の開環状水避けを備えて成ることを特徴とするポンプ。 A motor case end plate portion provided with a central hole for the motor shaft to penetrate and a vent hole for air-cooling the inside of the motor, and a motor case end plate portion side provided with a through hole for the front end side of the motor shaft to pass through An impeller case end plate central portion that protrudes into the housing and houses a mechanical seal therein, a drainer plate fixed to the motor shaft between the motor case end plate portion and the impeller case end plate central portion, and the motor case end A pump having an opening communicating with a bottom side of an empty portion defined between a plate portion and a central portion of the impeller case end plate,
A central recess is formed by projecting so as to cover the outer periphery of the draining plate on the inner peripheral side of the vent of the outer surface of the motor case end plate portion on the inner peripheral side, and substantially downward from the central recess. A pump comprising a second open annular water avoidance having a second drainage gap oriented in
JP2004016592A 2004-01-26 2004-01-26 pump Expired - Lifetime JP4606031B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009127635A (en) * 2007-11-19 2009-06-11 Ntn Corp Constant velocity universal joint

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5136105U (en) * 1974-09-10 1976-03-17
JP2000073962A (en) * 1998-06-18 2000-03-07 Asmo Co Ltd Fluid pump device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5136105U (en) * 1974-09-10 1976-03-17
JP2000073962A (en) * 1998-06-18 2000-03-07 Asmo Co Ltd Fluid pump device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009127635A (en) * 2007-11-19 2009-06-11 Ntn Corp Constant velocity universal joint

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