JP2010275948A - Fluid device and pump device - Google Patents

Fluid device and pump device Download PDF

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JP2010275948A
JP2010275948A JP2009130167A JP2009130167A JP2010275948A JP 2010275948 A JP2010275948 A JP 2010275948A JP 2009130167 A JP2009130167 A JP 2009130167A JP 2009130167 A JP2009130167 A JP 2009130167A JP 2010275948 A JP2010275948 A JP 2010275948A
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rotating shaft
outer peripheral
fluid
impeller body
partition member
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JP5410841B2 (en
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Nobuki Kokubo
信樹 小窪
Hideaki Ito
秀明 伊藤
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Nidec Instruments Corp
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Nidec Sankyo Corp
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  • Sealing Of Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid device such as a pump device and a hydraulic power generation device securing high liquid-tightness and airtightness even when a through hole is formed in a partition member intervened between an electromagnetic part and a fluid chamber. <P>SOLUTION: In the pump device 100, among a plurality of fixed members 11, the holder member 5 is formed with a cylindrical part 51 for receiving a seal member, which forms an annular space 80 between it and the outer peripheral surface of a rotating shaft 7 on a side where an motor part 2 is situated to the partition member 4, and a first annular seal member 8 contacting with the outer peripheral face of the rotating shaft 7 and with the inner peripheral face of the cylindrical part 51 for receiving the seal member is arranged in the annular space 80. On an outer peripheral side of the annular space 80, a second annular seal member 91 is caught between the partition member 4 and the holder member 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、電磁部と流体室との間に介在する隔壁部材に形成された貫通穴を電磁部から回転軸が貫通してインペラ体に連結されたポンプ装置や水力発電装置などの流体装置に関するものである。   The present invention relates to a fluid device such as a pump device or a hydraulic power generation device in which a rotating shaft passes through a through hole formed in a partition member interposed between an electromagnetic portion and a fluid chamber and is connected to an impeller body through the electromagnetic portion. Is.

ポンプ装置としては、モータ部（電磁部）とポンプ室（流体室）との間に介在する隔壁部材に形成された貫通穴をモータの回転軸が貫通してインペラ体に連結されたタイプのものが提案されており、かかるポンプ装置では、一般に、インペラ体に形成された連結用円筒部内に回転軸の端部が圧入された構造になっている。また、ポンプ装置では、ポンプ室を通過する液体が隔壁部材の貫通穴を介してモータ部の側に漏れることを防止するとともに、モータ部の側から隔壁部材の貫通穴を介してポンプ室に気泡が侵入しないように、インペラ体に形成された連結用円筒部と隔壁部材に設けたシール部材収納用筒部とによって構成された環状空間にオイルシールなどといった環状シール部材が設けられている（特許文献１、２参照）。   The pump device is of the type in which the rotating shaft of the motor passes through the through hole formed in the partition member interposed between the motor part (electromagnetic part) and the pump chamber (fluid chamber) and is connected to the impeller body In general, such a pump device has a structure in which an end portion of a rotating shaft is press-fitted into a connecting cylindrical portion formed in an impeller body. Further, in the pump device, the liquid passing through the pump chamber is prevented from leaking to the motor portion side through the through hole of the partition wall member, and air bubbles are introduced into the pump chamber from the motor portion side through the through hole of the partition wall member. An annular seal member such as an oil seal is provided in an annular space formed by a connecting cylindrical portion formed in the impeller body and a sealing member storage cylinder portion provided in the partition wall member (patent) References 1 and 2).

特開２０００−２１３４９１号公報JP 2000-213491 A 特開２００９−５９５４９号公報JP 2009-59549 A

しかしながら、特許文献１、２に記載の構成のように、インペラ体に形成された連結用円筒部の周りに環状シール部材を設けた構成では、液密性や気密性が低いという問題点がある。すなわち、インペラ体は、回転軸に連結されていることから、かかる連結部分の誤差などに起因してインペラ体に回転振れが発生し、液密性や気密性が低下する。また、インペラ体の連結用円筒部に回転軸を圧入した際、連結用円筒部がわずかでも変形すると、連結用円筒部の外周面の真円度が低下し、液密性や気密性が低下する。同様な問題点は、水力発電装置でも共通する課題である。   However, as in the configurations described in Patent Documents 1 and 2, the configuration in which the annular seal member is provided around the connecting cylindrical portion formed in the impeller body has a problem that liquid tightness and air tightness are low. . In other words, since the impeller body is connected to the rotating shaft, the impeller body is subjected to rotational vibration due to an error in the connecting portion, and the liquid-tightness and air-tightness are reduced. In addition, when the rotating shaft is press-fitted into the connecting cylindrical portion of the impeller body, if the connecting cylindrical portion is slightly deformed, the roundness of the outer peripheral surface of the connecting cylindrical portion is reduced, and the liquid tightness and air tightness are reduced. To do. Similar problems are common to hydroelectric generators.

以上の問題点に鑑みて、本発明の課題は、機構部と流体室との間に介在する隔壁部材に貫通穴を形成した場合でも高い液密性や気密性を確保することのできるポンプ装置や水力発電装置などの流体装置を提供することにある。   In view of the above problems, an object of the present invention is to provide a pump device that can ensure high liquid tightness and air tightness even when a through hole is formed in a partition member interposed between a mechanism portion and a fluid chamber. It is to provide a fluid device such as a hydroelectric generator.

上記課題を解決するために、本発明では、ロータおよびステータコイルが配置された電磁部と、インペラ体が配置された流体室と、該流体室と前記電磁部との間に介在する隔壁部材を含む複数の固定部材と、を有し、前記隔壁部材に形成された貫通穴を前記電磁部から回転軸が貫通して前記インペラ体に連結された流体装置において、前記複数の固定部材のいずれか１つの固定部材には、前記隔壁部材に対して前記電磁部が位置する側で前記回転軸の外周面との間に環状空間を構成するシール部材収納用筒部が形成され、前記環状空間には、前記回転軸の外周面および前記シール部材収納用筒部の内周面に接する第１環状シール部材が設けられていることを特徴とする。   In order to solve the above problems, in the present invention, an electromagnetic part in which a rotor and a stator coil are arranged, a fluid chamber in which an impeller body is arranged, and a partition member interposed between the fluid chamber and the electromagnetic part are provided. A fluid device in which a rotating shaft passes through a through hole formed in the partition wall member and is connected to the impeller body through any of the plurality of fixing members. One fixing member is formed with a sealing member storage cylinder portion that forms an annular space between the partition member and the outer peripheral surface of the rotary shaft on the side where the electromagnetic portion is located. Is provided with a first annular seal member that is in contact with the outer peripheral surface of the rotating shaft and the inner peripheral surface of the seal member storage tubular portion.

本発明において、流体装置はポンプ装置や水力発電装置として構成される。流体装置が水力発電装置である場合、インペラ体は発電用羽根車である。また、流体装置がポンプ装置である場合、インペラ体は、遠心型インペラ体、軸流型インペラ体等、「流体にエネルギーを与えるための羽根を持つ回転体」である。   In the present invention, the fluid device is configured as a pump device or a hydroelectric generator. When the fluid device is a hydroelectric generator, the impeller body is a power generation impeller. When the fluid device is a pump device, the impeller body is a “rotary body having blades for applying energy to the fluid” such as a centrifugal impeller body or an axial-flow impeller body.

本発明では、電磁部と流体室との間に介在する隔壁部材に形成された貫通穴を電磁部から回転軸が貫通してインペラ体に連結されており、流体装置がポンプ装置である場合、回転軸が回転すると、流体室でインペラ体が回転し、流体室での流体の吸入および吐出が行なわれる。また、流体装置が水力発電装置である場合、流体室を流れる流体によってインペラが回転すると、回転軸が回転して発電が行なわれる。ここで、複数の固定部材のいずれか１つの固定部材には、隔壁部材に対して電磁部が位置する側で回転軸の外周面との間に環状空間を構成するシール部材収納用筒部が形成され、かかる環状空間には、回転軸の外周面およびシール部材収納用筒部の内周面に接する第１環状シール部材が設けられている。このため、流体室から流体が回転軸の外周面を伝って電磁部の側に漏れることを防止することができるとともに、電磁部の側から回転軸の外周面を伝って流体室に気泡が侵入することを防止することができる。特に本発明では、第１環状シール部材が回転軸の外周面に直接、接しているため、第１環状シール部材がインペラ体と接している構造と違って、第１環状シール部材と回転軸との同芯度が高い。それ故、液密性や気密性が高いので、流体室から流体が回転軸の外周面を伝って電磁部の側に漏れることを確実に防止することができるとともに、電磁部の側から回転軸の外周面を伝って流体室に気泡が侵入することを確実に防止することができる。   In the present invention, when the rotating shaft passes through the through hole formed in the partition member interposed between the electromagnetic part and the fluid chamber from the electromagnetic part and is connected to the impeller body, and the fluid device is a pump device, When the rotation shaft rotates, the impeller body rotates in the fluid chamber, and the fluid is sucked and discharged in the fluid chamber. Further, when the fluid device is a hydroelectric power generation device, when the impeller is rotated by the fluid flowing through the fluid chamber, the rotating shaft rotates to generate power. Here, in any one of the plurality of fixing members, a sealing member housing cylinder portion that forms an annular space between the outer peripheral surface of the rotating shaft on the side where the electromagnetic portion is located with respect to the partition member. The annular space formed is provided with a first annular seal member that is in contact with the outer peripheral surface of the rotating shaft and the inner peripheral surface of the seal member housing cylinder. For this reason, fluid can be prevented from leaking from the fluid chamber along the outer peripheral surface of the rotating shaft to the electromagnetic unit side, and bubbles can enter the fluid chamber from the electromagnetic unit side through the outer peripheral surface of the rotating shaft. Can be prevented. Particularly in the present invention, since the first annular seal member is in direct contact with the outer peripheral surface of the rotary shaft, the first annular seal member and the rotary shaft are different from the structure in which the first annular seal member is in contact with the impeller body. High concentricity. Therefore, liquid-tightness and airtightness are high, so that it is possible to reliably prevent fluid from leaking from the fluid chamber to the electromagnetic part side along the outer peripheral surface of the rotary shaft, and from the electromagnetic part side to the rotary shaft. It is possible to reliably prevent bubbles from entering the fluid chamber through the outer peripheral surface of the fluid.

本発明において、前記複数の固定部材のうち、前記シール部材収納用筒部が形成されている固定部材は、前記回転軸に対するラジアル軸受を保持するホルダ部材であることが好ましい。かかる構成を採用すると、シール部材収納用筒部と回転軸との同芯度が高いので、第１環状シール部材と回転軸との同芯度が高い状態を確実に実現することができる。   In this invention, it is preferable that the fixing member in which the said cylinder part for sealing member accommodation is formed among these fixing members is a holder member holding the radial bearing with respect to the said rotating shaft. When such a configuration is adopted, the concentricity between the sealing member housing cylinder and the rotating shaft is high, so that a state where the concentricity between the first annular seal member and the rotating shaft is high can be reliably realized.

本発明において、前記環状空間より外周側では、前記隔壁部材と前記ホルダ部材との間に第２環状シール部材が挟持されていることが好ましい。かかる構成を採用すると、流体室から流体が隔壁部材とホルダ部材との間を伝って外部に漏れることを防止することができるとともに、外部から隔壁部材とホルダ部材との間を伝って流体室に気泡が侵入することを防止することができる。   In the present invention, it is preferable that a second annular seal member is sandwiched between the partition member and the holder member on the outer peripheral side from the annular space. When such a configuration is adopted, the fluid can be prevented from leaking from the fluid chamber to the outside through the partition member and the holder member, and from the outside to the fluid chamber through the partition member and the holder member. Air bubbles can be prevented from entering.

本発明において、前記貫通穴の内径寸法は、前記シール部材収納用筒部の内径寸法より小さく、前記環状空間において前記隔壁部材が位置する側の開口は、当該隔壁部材によって略封鎖されていることが好ましい。かかる構成を採用すると、第１環状シール部材が流体室の側にずれることを隔壁部材によって防止することができる。   In the present invention, the inner diameter dimension of the through hole is smaller than the inner diameter dimension of the sealing member accommodating cylinder, and the opening on the side where the partition member is located in the annular space is substantially sealed by the partition member. Is preferred. When such a configuration is adopted, the partition member can prevent the first annular seal member from shifting toward the fluid chamber.

本発明において、前記隔壁部材において前記流体室が位置する側に、前記インペラ体に直接あるいは摺動部材（例えば、スラストワッシャ）を介して当接して当該インペラ体および前記回転軸の前記電磁部側への変位を規制するスラスト受け部が設けられている構成を採用することができる。かかる構成によれば、スラスト受け部がモータ回転軸線の近くに位置するため、スラスト受け部での摺動ロスが小さいという利点がある。   In the present invention, on the side where the fluid chamber is located in the partition member, the impeller body abuts directly or via a sliding member (for example, a thrust washer), and the impeller body and the electromagnetic part side of the rotating shaft It is possible to employ a configuration in which a thrust receiving portion for restricting the displacement to the is provided. According to this configuration, since the thrust receiving portion is located near the motor rotation axis, there is an advantage that the sliding loss at the thrust receiving portion is small.

本発明において、前記インペラ体は、前記隔壁部材と対向する面側に、放射状に延在する複数の裏羽根を備え、当該裏羽根は、前記インペラ体において前記スラスト受け部と対向する環状領域の外周縁から径方向外側に延在していることが好ましい。かかる構成を採用すると、インペラ体の裏面側と隔壁部材との間に異物が侵入することを抑制することができる。また、貫通穴付近を負圧にすることができるので、第１環状シール部材のシール性能が低下しても、流体室から電磁部へ流体が漏れることを抑制することができる。   In the present invention, the impeller body includes a plurality of radially extending back blades on a surface facing the partition member, and the back blade is an annular region facing the thrust receiving portion in the impeller body. It is preferable that the outer peripheral edge extends radially outward. When such a configuration is adopted, it is possible to prevent foreign matter from entering between the back surface side of the impeller body and the partition member. Moreover, since the vicinity of the through hole can be set to a negative pressure, even if the sealing performance of the first annular seal member is lowered, it is possible to suppress the fluid from leaking from the fluid chamber to the electromagnetic part.

本発明において、前記回転軸において前記電磁部側に位置する端部には、前記ステータコイルに対して軸線方向で対向する底板部を備えた金属製のロータケースが連結され、前記底板部において前記ステータコイルと対向する面には絶縁シートが貼付されていることが好ましい。このように構成すると、ステータコイルとロータとの間には、ステータコイルとロータケースに貼付された絶縁シートとの間に介在する空気層からなる第１絶縁層と、絶縁シートからなる第２絶縁層とが設けられているため、絶縁性能に優れている。しかも、かかる絶縁構造であれば、流体装置内の狭い隙間に設けることができるので、流体装置の小型化を図るのに適している。   In the present invention, a metal rotor case having a bottom plate portion that is axially opposed to the stator coil is connected to an end portion of the rotating shaft that is located on the electromagnetic portion side, It is preferable that an insulating sheet is attached to a surface facing the stator coil. If comprised in this way, between a stator coil and a rotor, the 1st insulating layer which consists of an air layer interposed between a stator coil and the insulating sheet affixed on the rotor case, and the 2nd insulation which consists of an insulating sheet Since the layer is provided, the insulating performance is excellent. Moreover, such an insulating structure can be provided in a narrow gap in the fluid device, which is suitable for downsizing the fluid device.

本発明では、複数の固定部材のいずれか１つの固定部材には、隔壁部材に対して電磁部が位置する側で回転軸の外周面との間に環状空間を構成するシール部材収納用筒部が形成され、かかる環状空間には、回転軸の外周面およびシール部材収納用筒部の内周面に接する第１環状シール部材が設けられている。このため、流体室から流体が回転軸の外周面を伝って電磁部の側に漏れることを防止することができるとともに、電磁部の側から回転軸の外周面を伝って流体室に気泡が侵入することを防止することができる。特に本発明では、第１環状シール部材が回転軸の外周面に直接、接しているため、第１環状シール部材がインペラ体と接している構造と違って、第１環状シール部材と回転軸との同芯度が常に高い。それ故、液密性や気密性が高いので、流体室から流体が回転軸の外周面を伝って電磁部の側に漏れることを確実に防止することができるとともに、電磁部の側から回転軸の外周面を伝って流体室に気泡が侵入することを確実に防止することができる。   In the present invention, any one of the plurality of fixing members includes a sealing member housing cylinder portion that forms an annular space between the partition member and the outer peripheral surface of the rotating shaft on the side where the electromagnetic portion is located. The annular space is provided with a first annular seal member that is in contact with the outer peripheral surface of the rotary shaft and the inner peripheral surface of the seal member accommodating cylinder. For this reason, fluid can be prevented from leaking from the fluid chamber along the outer peripheral surface of the rotating shaft to the electromagnetic unit side, and bubbles can enter the fluid chamber from the electromagnetic unit side through the outer peripheral surface of the rotating shaft. Can be prevented. Particularly in the present invention, since the first annular seal member is in direct contact with the outer peripheral surface of the rotary shaft, the first annular seal member and the rotary shaft are different from the structure in which the first annular seal member is in contact with the impeller body. The concentricity of is always high. Therefore, liquid-tightness and airtightness are high, so that it is possible to reliably prevent fluid from leaking from the fluid chamber to the electromagnetic part side along the outer peripheral surface of the rotary shaft, and from the electromagnetic part side to the rotary shaft. It is possible to reliably prevent bubbles from entering the fluid chamber through the outer peripheral surface of the fluid.

（ａ）、（ｂ）は、本発明の実施の形態に係るポンプ装置の平面図、およびＡ−Ａ′断面図である。(A), (b) is the top view and AA 'sectional drawing of the pump apparatus which concern on embodiment of this invention. 本発明の実施の形態に係るポンプ装置の要部を拡大して示す断面図である。It is sectional drawing which expands and shows the principal part of the pump apparatus which concerns on embodiment of this invention. 本発明の実施の形態に係るポンプ装置に用いた隔壁部材の断面図、およびホルダ部材の断面図である。It is sectional drawing of the partition member used for the pump apparatus which concerns on embodiment of this invention, and sectional drawing of a holder member. 本発明の実施の形態に係るポンプ装置に用いたインペラ体の説明図である。It is explanatory drawing of the impeller body used for the pump apparatus which concerns on embodiment of this invention.

以下、本発明を実施するための形態について、図面を参照しながら説明する。本発明の流体装置は、ポンプ装置および水力発電装置の双方に適用できるが、以下、本発明をポンプ装置に適用した例を中心に説明する。   Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The fluid device of the present invention can be applied to both a pump device and a hydroelectric power generator. Hereinafter, an example in which the present invention is applied to a pump device will be mainly described.

図１（ａ）、（ｂ）は、本発明の実施の形態に係るポンプ装置の平面図、およびＡ−Ａ′断面図である。図２は、本発明の実施の形態に係るポンプ装置の要部を拡大して示す断面図であり、図２（ａ）にホルダ部材およびその周辺を拡大して示し、図２（ｂ）には隔壁部材の貫通穴およびその周辺をさらに拡大して示してある。図３（ａ）、（ｂ）は、本発明の実施の形態に係るポンプ装置に用いた隔壁部材の断面図、およびホルダ部材の断面図である。    1A and 1B are a plan view and a cross-sectional view taken along line AA ′ of a pump device according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a main part of the pump device according to the embodiment of the present invention. FIG. 2A shows an enlarged view of the holder member and its periphery, and FIG. Fig. 5 further shows the through hole of the partition member and the periphery thereof. 3A and 3B are a cross-sectional view of a partition wall member used in the pump device according to the embodiment of the present invention and a cross-sectional view of a holder member.

図１（ａ）、（ｂ）および図２に示す遠心型インペラ体を備えたポンプ装置１００（流体装置）は、例えば、全自動洗濯機において、洗濯部位に洗浄用の流体を汲み上げる流体ポンプであり、例えば、洗濯槽内の洗浄水を循環させて洗濯部位に供給する。また、本形態のポンプ装置１００は、排水ポンプなどとして用いることもできる。かかるポンプ装置１００を構成するにあたって、本形態では、以下に説明するように、ポンプとモータが一体構造となっている。   A pump device 100 (fluid device) having a centrifugal impeller body shown in FIGS. 1A, 1B, and 2 is a fluid pump that pumps a cleaning fluid to a washing site in, for example, a fully automatic washing machine. Yes, for example, the washing water in the washing tub is circulated and supplied to the washing site. Moreover, the pump apparatus 100 of this embodiment can also be used as a drainage pump or the like. In configuring the pump device 100, in this embodiment, the pump and the motor are integrated as described below.

本形態のポンプ装置１００は、ポンプ室１（流体室）とモータ部２（電磁部）との間に介在する隔壁部材４、ポンプケース３、およびホルダ部材５などの固定部材１１を備えており、隔壁部材４の一方面側にポンプケース３が被せられることによって、隔壁部材４の一方面側には、インペラ体６を備えたポンプ室１が構成されている。これに対して、隔壁部材４の他方面側には回転軸７を備えたモータ部２が構成されている。隔壁部材４、ポンプケース３およびホルダ部材５は、樹脂製であり、かかる樹脂材料としては、ガラスを混入したガラス入りＰＰ樹脂などの複合材料を用いることもある。   The pump device 100 of this embodiment includes a fixing member 11 such as a partition member 4, a pump case 3, and a holder member 5 interposed between the pump chamber 1 (fluid chamber) and the motor unit 2 (electromagnetic unit). The pump chamber 3 having the impeller body 6 is formed on one side of the partition member 4 by covering the pump case 3 on one side of the partition member 4. On the other hand, the motor part 2 provided with the rotating shaft 7 is comprised in the other surface side of the partition member 4. As shown in FIG. The partition member 4, the pump case 3, and the holder member 5 are made of resin, and as such a resin material, a composite material such as glass-filled PP resin mixed with glass may be used.

図１（ｂ）および図２に示すように、隔壁部材４においてモータ軸線Ｌ上には貫通穴４０が形成されており、モータ部２の側から突出した回転軸７は貫通穴４０を貫通してインペラ体６と圧入結合されている。このため、回転軸７が回転すると、ポンプ室１でインペラ体６が回転し、ポンプ室１での流体の吸入および吐出が行なわれる。   As shown in FIGS. 1B and 2, a through hole 40 is formed on the motor axis L in the partition member 4, and the rotating shaft 7 protruding from the motor part 2 side passes through the through hole 40. Thus, it is press-fitted to the impeller body 6. For this reason, when the rotating shaft 7 rotates, the impeller body 6 rotates in the pump chamber 1, and suction and discharge of fluid in the pump chamber 1 are performed.

（ポンプケース３および隔壁部材４の構成）
図２および図３（ａ）に示すように、ポンプケース３は、内側にインペラ体６が配置されたカップ状の本体部分３０と、この本体部分３０の上底部３６の中央からモータ軸線Ｌ方向に延在する円筒状の吸引管部３３と、本体部分３０の円筒状胴部３７からその接線方向に延在する吐出管部３５とを備えている。 (Configuration of pump case 3 and partition member 4)
As shown in FIG. 2 and FIG. 3A, the pump case 3 includes a cup-shaped main body portion 30 on which the impeller body 6 is disposed, and the center of the upper bottom portion 36 of the main body portion 30 in the direction of the motor axis L. And a discharge tube portion 35 extending in a tangential direction from the cylindrical body portion 37 of the main body portion 30.

隔壁部材４は、モータ部２側に開口するカップ形状を有しており、モータ軸線方向に垂直な板状本体部分４１と、板状本体部分４１の外周縁からモータ部２の側に起立する側壁部４９とを有している。隔壁部材４において、板状本体部分４１の略中央部分には、ポンプ室１に向けて突出した表側円筒部４２を備えており、かかる表側円筒部４２の内周側には、中央部分がモータ部２の側に凹んだ隔壁部４７が設けられている。隔壁部４７は、半径方向外側部分がポンプ室１に向けて斜めに突出したテーパ部４３になっており、かかるテーパ部４３の底部は、モータ軸線Ｌに対して直交する底板部４４になっている。底板部４４において、ポンプ室１の側に位置する表面側は、中央領域が浅い凹部４７８になっており、凹部４７８の底部の中央領域は、さらに浅く凹んだ凹部４７９になっている。   The partition member 4 has a cup shape that opens to the motor unit 2 side, and stands on the motor unit 2 side from the plate-like main body portion 41 perpendicular to the motor axial direction and the outer peripheral edge of the plate-like main body portion 41. And a side wall 49. In the partition wall member 4, a substantially central portion of the plate-like main body portion 41 is provided with a front side cylindrical portion 42 protruding toward the pump chamber 1, and the central portion is a motor on the inner peripheral side of the front side cylindrical portion 42. A recessed partition 47 is provided on the side of the part 2. The partition wall portion 47 is a tapered portion 43 whose outer portion in the radial direction protrudes obliquely toward the pump chamber 1, and the bottom portion of the tapered portion 43 is a bottom plate portion 44 orthogonal to the motor axis L. Yes. In the bottom plate portion 44, the surface side located on the pump chamber 1 side is a concave portion 478 having a shallow central region, and the central region at the bottom portion of the concave portion 478 is a concave portion 479 that is further shallowly recessed.

隔壁部４７において、底板部４４の中央には、回転軸７をモータ部２からポンプ室１に向けて貫通させる円形の貫通穴４０が形成されており、かかる貫通穴４０は、凹部４７９の中央で開口している。本形態において、貫通穴４０の内径寸法は、回転軸７の外径寸法よりわずかに大きい。このため、貫通穴４０の内周縁と回転軸７の外周面との間には狭い環状隙間が介在している。   In the partition wall portion 47, a circular through hole 40 is formed in the center of the bottom plate portion 44 to penetrate the rotary shaft 7 from the motor portion 2 toward the pump chamber 1. It is open at. In this embodiment, the inner diameter dimension of the through hole 40 is slightly larger than the outer diameter dimension of the rotating shaft 7. For this reason, a narrow annular gap is interposed between the inner peripheral edge of the through hole 40 and the outer peripheral surface of the rotating shaft 7.

隔壁部４７において、モータ部２が位置する裏面側には、モータ部２の側に向けて突出する円筒部４６が形成されており、円筒部４６は、貫通穴４０と同芯状に形成されている。円筒部４６の先端部では、内面側に２つの環状段部が形成されている。また、隔壁部４７の裏面側には、円筒部４６より内側に、円筒部４６と同芯状に環状突起４７１が形成されている。かかる環状突起４７１は円筒部４６に比較して突出寸法がかなり小さい。   In the partition wall portion 47, a cylindrical portion 46 that protrudes toward the motor portion 2 is formed on the back side where the motor portion 2 is located. The cylindrical portion 46 is formed concentrically with the through hole 40. ing. At the distal end of the cylindrical portion 46, two annular step portions are formed on the inner surface side. An annular protrusion 471 is formed on the back surface side of the partition wall 47 so as to be concentric with the cylindrical portion 46 on the inner side of the cylindrical portion 46. Such an annular protrusion 471 has a considerably small protrusion size compared to the cylindrical portion 46.

隔壁部材４の裏面側において、円筒部４６より外周側には、隔壁部４７に相当する部分を囲むようにモータ部２の側に突出する側板部４１１が形成されている。かかる側板部４１１、円筒部４６および側壁部４９は、後述するように、隔壁部材４とホルダ部材５とを連結する際、ホルダ部材５の位置決めなどに用いられる。   On the back surface side of the partition member 4, a side plate portion 411 that protrudes toward the motor portion 2 is formed on the outer peripheral side of the cylindrical portion 46 so as to surround a portion corresponding to the partition wall portion 47. The side plate portion 411, the cylindrical portion 46, and the side wall portion 49 are used for positioning the holder member 5 and the like when connecting the partition wall member 4 and the holder member 5, as will be described later.

図２に示すように、ポンプケース３は、本体部分３０が隔壁部材４の表側円筒部４２の外側に嵌った状態で、隔壁部材４と結合されている。表側円筒部４２の根元部分の外側には液密用および気密用のＯリング９２が装着されており、かかるＯリング９２は、ポンプケース３の本体部分３０の円筒状胴部３７の開放端側でわずかに拡径する段部と、表側円筒部４２の根元部分との間に挟持されている。   As shown in FIG. 2, the pump case 3 is coupled to the partition wall member 4 with the main body portion 30 fitted to the outside of the front side cylindrical portion 42 of the partition wall member 4. A liquid-tight and air-tight O-ring 92 is attached to the outer side of the base portion of the front-side cylindrical portion 42, and the O-ring 92 is on the open end side of the cylindrical body portion 37 of the main body portion 30 of the pump case 3. And is sandwiched between the stepped portion that slightly expands in diameter and the root portion of the front cylindrical portion 42.

（インペラ体６の構成）
図４は、本発明の実施の形態に係るポンプ装置１００に用いたインペラ体６の説明図であり、図４（ａ）、（ｂ）は、インペラ体６をポンプ室１の側からみた斜視図、およびモータ部２の側からみた斜視図である。 (Configuration of impeller body 6)
4A and 4B are explanatory views of the impeller body 6 used in the pump device 100 according to the embodiment of the present invention. FIGS. 4A and 4B are perspective views of the impeller body 6 viewed from the pump chamber 1 side. It is a perspective view seen from the figure and the motor part 2 side.

図２および図４（ａ）、（ｂ）に示すように、インペラ体６は、円板部６０と、この円板部６０の中央からポンプ室１側に突出する有底の連結用円筒部６５と、円板部６０においてポンプ室１側に面する表面側で起立する５枚の表羽根６１とを備えており、５枚の表羽根６１は、連結用円筒部６５の周りで等角度間隔に形成されている。   As shown in FIGS. 2 and 4 (a) and 4 (b), the impeller body 6 includes a disc portion 60 and a bottomed connecting cylindrical portion protruding from the center of the disc portion 60 toward the pump chamber 1 side. 65 and five front blades 61 standing on the surface side facing the pump chamber 1 in the disc portion 60, and the five front blades 61 are equiangular around the connecting cylindrical portion 65. It is formed at intervals.

また、インペラ体６は、円板部６０においてモータ部２側に面する裏面側に、円板部６０の中央からモータ部２の側に突出する環状突部６４と、環状突部６４の周りでモータ部２の側に向けて起立する１０枚の裏羽根６６とを備えており、１０枚の裏羽根６６は、環状突部６４の周りで等角度間隔に形成されている。裏羽根６６は、環状突部６４の外周縁から径方向外側に延在しており、裏羽根６６の径方向外側端部は、円板部６０の外周縁まで届いている。   Further, the impeller body 6 has an annular protrusion 64 projecting from the center of the disk part 60 toward the motor part 2 on the back surface side facing the motor part 2 side of the disk part 60, and around the annular protrusion 64. And 10 back blades 66 standing up toward the motor unit 2 side, and the 10 back blades 66 are formed around the annular projection 64 at equal angular intervals. The back blade 66 extends radially outward from the outer periphery of the annular protrusion 64, and the radially outer end of the back blade 66 reaches the outer periphery of the disc portion 60.

裏羽根６６において、モータ軸線Ｌ方向の寸法（幅寸法）は、円板部６０の中央側で大であるのに対して、外周側で小になっている。このため、裏羽根６６のモータ軸線方向のモータ部２側の端部は、外周側にいくに従ってモータ部２側から離間し、裏羽根６６のモータ軸線方向のモータ部２側の端部は、中央側にいくに従ってモータ部２側に接近している。但し、隔壁部材４の板状本体部分４１の表面側には、大径の凹部４７８が形成されているとともに、凹部４７８の中央には小径の凹部４７９が形成されている。このため、裏羽根６６のモータ軸線方向のモータ部２側の端部と、隔壁部材４の板状本体部分４１の表面側とは、径方向において略同一の間隔を隔てた形状になっている。また、裏羽根６６の外周側端部は、斜めに切断された形状のテーパ面６６０になっている。   In the back blade 66, the dimension (width dimension) in the motor axis line L direction is large on the central side of the disc portion 60, but small on the outer peripheral side. For this reason, the end of the back blade 66 on the motor unit 2 side in the motor axis direction is separated from the motor unit 2 side as going to the outer peripheral side, and the end of the back blade 66 on the motor unit 2 side in the motor axis direction is The closer to the center, the closer to the motor unit 2 side. However, a large-diameter concave portion 478 is formed on the surface side of the plate-like main body portion 41 of the partition wall member 4, and a small-diameter concave portion 479 is formed in the center of the concave portion 478. For this reason, the end of the back blade 66 in the motor axis direction on the motor unit 2 side and the surface side of the plate-like main body portion 41 of the partition wall member 4 have a shape that is substantially spaced apart in the radial direction. . Moreover, the outer peripheral side edge part of the back blade | wing 66 is the taper surface 660 of the shape cut | disconnected diagonally.

（モータ部２の構成）
図２に示すように、本形態のポンプ装置１００は、モータ部２の側にホルダ部材５を備えており、ホルダ部材５は、モータ軸線Ｌ方向に対して直交する方向に広がる板状本体部分５６と、この板状本体部分５６の略中央からモータ部２が位置する側に突出する軸受保持部５５とを備えている。軸受保持部５５には、回転軸７が貫通する軸穴５７が形成されており、かかる軸穴５７の内径寸法は回転軸７の外径寸法よりわずかに大きい。軸穴５７において、ホルダ部材５のモータ軸線Ｌ方向の両端には一対の環状段部５７２、５７３が形成されている。本形態では、かかる環状段部５７２、５７３に、回転軸７を回転可能に支持する円筒状のラジアル軸受２４、２５が保持されている。また、回転軸７において、ポンプ室１が位置する側とは反対側の端部にはワッシャ７７が取り付けられており、かかるワッシャ７７は、ラジアル軸受２５の端部に当接して回転軸７がポンプ室１の側に変位することを規制する。 (Configuration of motor unit 2)
As shown in FIG. 2, the pump device 100 of this embodiment includes a holder member 5 on the motor unit 2 side, and the holder member 5 is a plate-like main body portion that extends in a direction orthogonal to the motor axis L direction. 56 and a bearing holding portion 55 that protrudes from the approximate center of the plate-like main body portion 56 to the side where the motor portion 2 is located. A shaft hole 57 through which the rotating shaft 7 passes is formed in the bearing holding portion 55, and the inner diameter dimension of the shaft hole 57 is slightly larger than the outer diameter dimension of the rotating shaft 7. In the shaft hole 57, a pair of annular step portions 572 and 573 are formed at both ends of the holder member 5 in the motor axis L direction. In the present embodiment, cylindrical radial bearings 24 and 25 that rotatably support the rotary shaft 7 are held on the annular step portions 572 and 573. A washer 77 is attached to the end of the rotary shaft 7 opposite to the side where the pump chamber 1 is located. The washer 77 is in contact with the end of the radial bearing 25 so that the rotary shaft 7 Displacement to the pump chamber 1 side is regulated.

本形態では、回転軸７のポンプ室１側の端部７１は、隔壁部材４の貫通穴４０を貫通して、インペラ体６の円筒部６５の内側に圧入固定されており、回転軸７においてインペラ体６に嵌められる端部７１には、圧入結合を強化するためのローレットなどが形成されている。   In this embodiment, the end portion 71 on the pump chamber 1 side of the rotating shaft 7 passes through the through hole 40 of the partition wall member 4 and is press-fitted and fixed inside the cylindrical portion 65 of the impeller body 6. A knurling or the like is formed on the end 71 fitted to the impeller body 6 to reinforce the press-fit connection.

ホルダ部材５において、板状本体部分５６の略中央には、ポンプ室１の側に向けて円筒状のシール部材収納用筒部５１が突出しており、かかるシール部材収納用筒部５１は、回転軸７の外周面との間に環状空間８０を形成している。   In the holder member 5, a cylindrical seal member storage cylinder 51 protrudes toward the pump chamber 1 at the approximate center of the plate-like main body portion 56, and the seal member storage cylinder 51 rotates. An annular space 80 is formed between the outer peripheral surface of the shaft 7.

また、ホルダ部材５の板状本体部分５６において、シール部材収納用筒部５１の付け根部分の外周側は、隔壁部材４の円筒部４６に形成された２つの環状段部のうち、外周側の段部の内側に嵌る環状段部５９が形成されている。さらに、ホルダ部材５の板状本体部分５６においてポンプ室１の方を向く表面側には、隔壁部材４に形成した側板部４１１と係合する段部などが形成されており、ホルダ部材５と隔壁部材４とは、ホルダ部材５の板状本体部分５６と隔壁部材４の板状本体部分４１とは、モータ軸線Ｌ方向に所定の間隔があくように結合されている。   Further, in the plate-like main body portion 56 of the holder member 5, the outer peripheral side of the base portion of the sealing member storing cylinder portion 51 is the outer peripheral side of the two annular step portions formed in the cylindrical portion 46 of the partition wall member 4. An annular step 59 that fits inside the step is formed. Further, a stepped portion that engages with the side plate portion 411 formed on the partition wall member 4 is formed on the surface side facing the pump chamber 1 in the plate-like main body portion 56 of the holder member 5. With the partition member 4, the plate-like main body portion 56 of the holder member 5 and the plate-like main body portion 41 of the partition member 4 are coupled so as to have a predetermined interval in the motor axis L direction.

ホルダ部材５において、軸受保持部５５の外周側は、ステータコア２６を保持するコア保持部になっており、軸受保持部５５の外周側において板状本体部分５６から離間した位置には、ボルト２６０によって、複数枚のコア板を積層してなるステータコア２６が固定されている。また、ステータコア２６では、内側の環状部から径方向外側に向けて複数の突極が延在しており、かかる突極の周りにはステータコイル２７が巻回されている。   In the holder member 5, the outer peripheral side of the bearing holding portion 55 is a core holding portion that holds the stator core 26, and the outer peripheral side of the bearing holding portion 55 is separated from the plate-like main body portion 56 by a bolt 260. A stator core 26 formed by laminating a plurality of core plates is fixed. In the stator core 26, a plurality of salient poles extend radially outward from the inner annular portion, and a stator coil 27 is wound around the salient poles.

ホルダ部材５の板状本体部分５６において、ステータコア２６が位置する側には柱状突起５６１が複数、形成されており、かかる柱状突起５６１の端部には小突起が形成されている。本形態では、ステータコイル２７に給電するためのモータ基板２９の穴に柱状突起５６１の小突起を嵌めた後、小突起の先端部を押し潰すことにより、柱状突起５６１の先端部にモータ基板２９が保持されている。   In the plate-like main body portion 56 of the holder member 5, a plurality of columnar protrusions 561 are formed on the side where the stator core 26 is located, and small protrusions are formed at the ends of the columnar protrusions 561. In this embodiment, after the small protrusions of the columnar protrusions 561 are fitted in the holes of the motor substrate 29 for supplying power to the stator coil 27, the tip portions of the small protrusions are crushed so that the motor substrate 29 Is held.

（ロータの構成）
本形態のポンプ装置１００では、回転軸７においてポンプ室１が位置する側とは反対側の端部には、ステータコイル２７に対してモータ軸線Ｌ方向で対向する底板部２１８を備えた金属製のロータケース２１が連結されている。また、ロータケース２１において底板部２１８の外周縁から起立する円筒状胴部２１９の内周面にはステータコア２６に対して径方向外側で対向する円筒状のロータマグネット２２が保持されている。 (Configuration of rotor)
In the pump device 100 of the present embodiment, a metal plate provided with a bottom plate portion 218 that faces the stator coil 27 in the direction of the motor axis L at the end of the rotary shaft 7 opposite to the side where the pump chamber 1 is located. The rotor case 21 is connected. A cylindrical rotor magnet 22 that is opposed to the stator core 26 on the radially outer side is held on the inner peripheral surface of the cylindrical body 219 that stands up from the outer peripheral edge of the bottom plate 218 in the rotor case 21.

かかる構成のポンプ装置１００のモータ部２では、漏電防止という観点から、ステータコイル２７と金属製の回転軸７との間に十分な絶縁が必要である。そこで、本形態では、ロータケース２１においてステータコイル２７とモータ軸線Ｌ方向で対向する底板部２１８には、接着剤層によって絶縁性を有するＰＥＴ（ポリエチレンテレフタレート）等の樹脂シートを複数枚積層した絶縁シート２３が貼付されている。従って、本形態のポンプ装置１００において、ステータコイル２７とロータケース２１の底板部２１８との間には、ロータケース２１に貼付された絶縁シート２３との間に介在する空気層からなる第１絶縁層と、絶縁シート２３からなる第２絶縁層とが設けられている。   In the motor unit 2 of the pump device 100 having such a configuration, sufficient insulation is required between the stator coil 27 and the metal rotating shaft 7 from the viewpoint of preventing leakage. Therefore, in this embodiment, in the rotor case 21, the bottom plate portion 218 that faces the stator coil 27 in the direction of the motor axis L is an insulating layer in which a plurality of resin sheets such as PET (polyethylene terephthalate) having insulating properties are laminated by an adhesive layer. A sheet 23 is affixed. Therefore, in the pump device 100 of the present embodiment, the first insulation composed of an air layer interposed between the stator coil 27 and the bottom plate portion 218 of the rotor case 21 and the insulating sheet 23 attached to the rotor case 21. A layer and a second insulating layer made of the insulating sheet 23 are provided.

（ポンプ室１側とモータ部２側とのシール構造）
本形態では、回転軸７の端部は、隔壁部材４の貫通穴４０を貫通してインペラ体６に連結されている。このため、ポンプ室１の液体が隔壁の貫通穴４０を介してモータ部２の側に漏れるおそれがある。また、モータ部２の側から隔壁の貫通穴４０を介してポンプ室１に気泡が侵入するおそれがある。 (Seal structure between pump chamber 1 side and motor part 2 side)
In this embodiment, the end of the rotating shaft 7 passes through the through hole 40 of the partition wall member 4 and is connected to the impeller body 6. For this reason, the liquid in the pump chamber 1 may leak to the motor unit 2 side through the through hole 40 of the partition wall. Further, bubbles may enter the pump chamber 1 from the side of the motor unit 2 through the through hole 40 of the partition wall.

そこで、本形態では、ホルダ部材５には、回転軸７の外周面との間に環状空間８０を形成するシール部材収納用筒部５１が形成されており、かかる環状空間８０には第１環状シール部材８が設けられている。第１環状シール部材８の内周部分は回転軸７の外周面に接し、第１環状シール部材８の外周面はシール部材収納用筒部５１の内周面に接している。本形態では、第１環状シール部材８として、嵌め合い部としての外周側円環部８１と、内周側円環部８２とが連結部８３で繋がったゴム製のオイルシールが用いられており、内周側円環部に８２は、シールリップ部８２１とダストリップ部８２２とが円環状に形成されている。また、連結部８３において隔壁部材４と対向する外面には環状突起８３１が形成されており、かかる環状突起８３１は、隔壁部材４の裏面側に形成された環状突起４７１に当接している。   Therefore, in the present embodiment, the holder member 5 is formed with a seal member housing cylinder portion 51 that forms an annular space 80 between the outer peripheral surface of the rotating shaft 7 and the annular space 80 has a first annular shape. A seal member 8 is provided. The inner peripheral portion of the first annular seal member 8 is in contact with the outer peripheral surface of the rotary shaft 7, and the outer peripheral surface of the first annular seal member 8 is in contact with the inner peripheral surface of the seal member housing cylinder portion 51. In this embodiment, as the first annular seal member 8, a rubber oil seal is used in which an outer peripheral ring portion 81 as a fitting portion and an inner peripheral ring portion 82 are connected by a connecting portion 83. In the inner ring portion 82, a seal lip portion 821 and a dust lip portion 822 are formed in an annular shape. An annular protrusion 831 is formed on the outer surface of the connecting portion 83 facing the partition member 4, and the annular protrusion 831 is in contact with an annular protrusion 471 formed on the back surface side of the partition member 4.

ここで、貫通穴４０の内径寸法は、回転軸７の外径寸法よりわずかに大きく、シール部材収納用筒部５１の内径寸法よりかなり小さい。このため、環状空間８０において隔壁部材４が位置する側の開口は、隔壁部材４によって略封鎖されている。   Here, the inner diameter dimension of the through hole 40 is slightly larger than the outer diameter dimension of the rotating shaft 7, and is considerably smaller than the inner diameter dimension of the sealing member storing cylinder portion 51. For this reason, the opening on the side where the partition member 4 is located in the annular space 80 is substantially sealed by the partition member 4.

また、本形態では、ホルダ部材５と隔壁部材４とを結合すると、シール部材収納用筒部５１の付け根部分の外周側と、隔壁部材４の円筒部４６の段部との間には環状の隙間が形成されており、環状の隙間には第２環状シール部材９１が配置されている。すなわち、本形態では、ホルダ部材５と隔壁部材４とを結合する際、シール部材収納用筒部５１の外周側に第２環状シール部材９１を装着しておき、ホルダ部材５と隔壁部材４とを結合した際、ホルダ部材５と隔壁部材４との間に第２環状シール部材９１が挟持されるようにしてある。本形態において、第２環状シール部材９１としてゴム製のＯリングが用いられている。   Further, in this embodiment, when the holder member 5 and the partition wall member 4 are coupled, an annular shape is formed between the outer peripheral side of the base portion of the sealing member storage cylinder portion 51 and the step portion of the cylindrical portion 46 of the partition wall member 4. A gap is formed, and a second annular seal member 91 is disposed in the annular gap. That is, in this embodiment, when the holder member 5 and the partition wall member 4 are coupled, the second annular seal member 91 is mounted on the outer peripheral side of the seal member housing cylinder 51, and the holder member 5 and the partition wall member 4 The second annular seal member 91 is sandwiched between the holder member 5 and the partition member 4 when the two are joined. In this embodiment, a rubber O-ring is used as the second annular seal member 91.

（インペラ体６に対するスラスト受けの構造）
本形態では、隔壁部材４に対してモータ部２の側に第１環状シール部材８が配置され、隔壁部材４よりポンプ室１の側には第１環状シール部材８が配置されていない。そこで、本形態では、回転軸７においてインペラ体６との結合部付近に摺動部材であるスラストワッシャ６９を装着し、隔壁部材４においてスラストワッシャ６９と対向する環状領域によって、インペラ体６にスラストワッシャ６９を介して当接してインペラ体６および回転軸７のモータ部２側への変位を規制するスラスト受け部４８が構成されている。すなわち、本形態では、隔壁部材４において貫通穴４０の開口縁付近をインペラ体６および回転軸７のモータ部２側への変位を規制するスラスト受け部４８として利用している。なお、インペラ体６および隔壁部材４の材質によっては、スラストワッシャ６９を省略することもあり、この場合、隔壁部材４のスラスト受け部４８は、インペラ体６に直接、当接してインペラ体６および回転軸７のモータ部２側への変位を規制する。なお、小径の凹部４７８をスラスト受け部４８としても良い。 (Thrust receiving structure for the impeller body 6)
In the present embodiment, the first annular seal member 8 is disposed on the motor unit 2 side with respect to the partition member 4, and the first annular seal member 8 is not disposed on the pump chamber 1 side with respect to the partition member 4. Therefore, in this embodiment, a thrust washer 69 that is a sliding member is mounted in the vicinity of the coupling portion between the rotating shaft 7 and the impeller body 6, and the impeller body 6 is thrust by the annular region facing the thrust washer 69 in the partition wall member 4. A thrust receiving portion 48 is configured to abut against the washer 69 and restrict displacement of the impeller body 6 and the rotating shaft 7 toward the motor portion 2 side. In other words, in this embodiment, the vicinity of the opening edge of the through hole 40 in the partition member 4 is used as a thrust receiving portion 48 that restricts the displacement of the impeller body 6 and the rotating shaft 7 toward the motor portion 2. Depending on the material of the impeller body 6 and the partition member 4, the thrust washer 69 may be omitted. In this case, the thrust receiving portion 48 of the partition member 4 directly contacts the impeller body 6 and the impeller body 6 and The displacement of the rotating shaft 7 toward the motor unit 2 is restricted. Note that the small-diameter concave portion 478 may be used as the thrust receiving portion 48.

ここで、スラストワッシャ６９およびスラスト受け部４８は、インペラ体６の環状突部６４と外径寸法が略等しい。従って、裏羽根６６は、インペラ体６においてスラスト受け部４８と対向する環状領域の外周縁から径方向外側に延在していることになる。   Here, the thrust washer 69 and the thrust receiving portion 48 have substantially the same outer diameter as the annular protrusion 64 of the impeller body 6. Therefore, the back blade 66 extends radially outward from the outer peripheral edge of the annular region facing the thrust receiving portion 48 in the impeller body 6.

（本形態の主な効果）
以上説明したように、本形態のポンプ装置１００では、複数の固定部材１１のうち、ホルダ部材５には、隔壁部材４に対してモータ部２が位置する側で回転軸７の外周面との間に環状空間８０を構成するシール部材収納用筒部５１が形成され、かかる環状空間８０には、回転軸７の外周面およびシール部材収納用筒部５１の内周面に接する第１環状シール部材８が配置されている。このため、ポンプ室１から流体が回転軸７の外周面を伝ってモータ部２の側に漏れることを防止することができるとともに、モータ部２の側から回転軸７の外周面を伝ってポンプ室１に気泡が侵入することを防止することができる。 (Main effects of this form)
As described above, in the pump device 100 of the present embodiment, among the plurality of fixing members 11, the holder member 5 is connected to the outer peripheral surface of the rotating shaft 7 on the side where the motor unit 2 is located with respect to the partition member 4. A seal member storage cylinder 51 constituting an annular space 80 is formed between the first annular seal 80 and the annular space 80 in contact with the outer peripheral surface of the rotating shaft 7 and the inner peripheral surface of the seal member storage cylinder 51. A member 8 is arranged. For this reason, it is possible to prevent fluid from leaking from the pump chamber 1 along the outer peripheral surface of the rotary shaft 7 to the motor unit 2 side, and also from the motor unit 2 side through the outer peripheral surface of the rotary shaft 7 to the pump. Air bubbles can be prevented from entering the chamber 1.

特に本形態では、第１環状シール部材８が回転軸７の外周面に直接、接しているため、第１環状シール部材８がインペラ体６と接している構造と違って、液密性や気密性が高い。すなわち、インペラ体６の側に第１環状シール部材８を当接させると、回転軸７とインペラ体６との同芯度の誤差に起因して、回転軸７が回転した際にインペラ体６に回転振れが発生する結果、液密性や気密性が低下するという問題がある。しかるに本形態では、第１環状シール部材８が直接、回転軸７の外周面に当接しており、第１環状シール部材８と回転軸７との間では高い同芯度が常に維持されるため、かかる問題がない。また、インペラ体６において回転軸７が圧入された円筒部の外周面と第１環状シール部材８を当接させた構造の場合、回転軸７を圧入した際、インペラ体６の円筒部の外周面が変形してインペラ体６の円筒部の外周面と第１環状シール部材８との同芯度が低下し、液密性や気密性が低下するという問題や、インペラ体６の外周部に変形を防止する金属製のシール部材が必要となるが、本形態によれば、第１環状シール部材８が直接、回転軸７の外周面に当接しているので、かかる問題がない。   In particular, in this embodiment, since the first annular seal member 8 is in direct contact with the outer peripheral surface of the rotating shaft 7, unlike the structure in which the first annular seal member 8 is in contact with the impeller body 6, liquid-tightness and airtightness are achieved. High nature. That is, when the first annular seal member 8 is brought into contact with the impeller body 6, the impeller body 6 is rotated when the rotation shaft 7 is rotated due to the concentricity error between the rotation shaft 7 and the impeller body 6. As a result of the occurrence of rotational vibration, there is a problem that liquid tightness and air tightness are lowered. However, in this embodiment, the first annular seal member 8 is in direct contact with the outer peripheral surface of the rotary shaft 7, and high concentricity is always maintained between the first annular seal member 8 and the rotary shaft 7. There is no such problem. Further, in the structure in which the outer peripheral surface of the cylindrical portion into which the rotary shaft 7 is press-fitted in the impeller body 6 and the first annular seal member 8 are brought into contact, the outer periphery of the cylindrical portion of the impeller body 6 when the rotary shaft 7 is press-fitted. Due to the deformation of the surface, the concentricity between the outer peripheral surface of the cylindrical portion of the impeller body 6 and the first annular seal member 8 decreases, and the liquid-tightness and air-tightness decrease, and the outer peripheral portion of the impeller body 6 Although a metal seal member that prevents deformation is required, according to the present embodiment, the first annular seal member 8 is in direct contact with the outer peripheral surface of the rotating shaft 7, so there is no such problem.

それ故、本形態のポンプ装置１００は、液密性や気密性が高いので、ポンプ室１から流体が回転軸７の外周面を伝ってモータ部２の側に漏れることを確実に防止することができるとともに、モータ部２の側から回転軸７の外周面を伝ってポンプ室１に気泡が侵入することを確実に防止することができる。しかも、シール部材収納用筒部５１は、複数の固定部材１１のうち、ラジアル軸受２４、２５を保持するホルダ部材５に形成されているため、シール部材収納用筒部５１と回転軸７との同芯度が高い。それ故、第１環状シール部材８と回転軸７との同芯度が高い状態を確実に実現することができる。   Therefore, since the pump device 100 of this embodiment has high liquid-tightness and airtightness, it is possible to reliably prevent fluid from leaking from the pump chamber 1 along the outer peripheral surface of the rotating shaft 7 to the motor unit 2 side. In addition, air bubbles can be reliably prevented from entering the pump chamber 1 along the outer peripheral surface of the rotating shaft 7 from the motor unit 2 side. Moreover, since the sealing member accommodating cylinder 51 is formed on the holder member 5 that holds the radial bearings 24 and 25 among the plurality of fixing members 11, the sealing member accommodating cylinder 51 and the rotary shaft 7 High concentricity. Therefore, a state where the concentricity between the first annular seal member 8 and the rotary shaft 7 is high can be reliably realized.

また、本形態では、環状空間８０より外周側では、隔壁部材４とホルダ部材５との間に第２環状シール部材９１が挟持されているため、ポンプ室１から流体が隔壁部材４とホルダ部材５との間を伝って外部に漏れることを防止することができるとともに、外部から隔壁部材４とホルダ部材５との間を伝ってポンプ室１に気泡が侵入することを防止することができる。   Further, in this embodiment, the second annular seal member 91 is sandwiched between the partition wall member 4 and the holder member 5 on the outer peripheral side from the annular space 80, so that fluid flows from the pump chamber 1 to the partition wall member 4 and the holder member. 5 can be prevented from leaking to the outside through the gap between 5 and the air, and air bubbles can be prevented from entering the pump chamber 1 through the gap between the partition member 4 and the holder member 5 from the outside.

さらに、隔壁部材４の貫通穴４０の内径寸法は、シール部材収納用筒部５１の内径寸法より小さく、環状空間８０において前記隔壁部材４が位置する側の開口は、当該隔壁部材４によって略封鎖されている。このため、第１環状シール部材８がポンプ室１の側にずれることを隔壁部材４によって防止することができる。   Further, the inner diameter dimension of the through hole 40 of the partition wall member 4 is smaller than the inner diameter dimension of the sealing member housing cylinder portion 51, and the opening on the side where the partition wall member 4 is located in the annular space 80 is substantially sealed by the partition wall member 4. Has been. For this reason, the partition member 4 can prevent the first annular seal member 8 from being displaced toward the pump chamber 1.

また、隔壁部材４の貫通穴４０の内周縁は、回転軸７の外周面との間に狭い隙間を形成するほど、モータ軸線Ｌ近傍に位置しているため、隔壁部材４においてポンプ室１が位置する側に、インペラ体６にスラストワッシャ６９を介して当接してインペラ体６および回転軸７のモータ部２側への変位を規制するスラスト受け部４８を設けることができる。また、スラスト受け部４８は、モータ軸線Ｌの近くに位置するため、スラスト受け部４８での摺動ロスが小さいという利点がある。   Further, since the inner peripheral edge of the through hole 40 of the partition wall member 4 is positioned closer to the motor axis L so that a narrower gap is formed between the outer peripheral surface of the rotating shaft 7, the pump chamber 1 is located in the partition wall member 4. A thrust receiving portion 48 that abuts the impeller body 6 via a thrust washer 69 and restricts displacement of the impeller body 6 and the rotating shaft 7 toward the motor portion 2 can be provided on the side where the impeller body 6 is located. Further, since the thrust receiving portion 48 is located near the motor axis L, there is an advantage that the sliding loss at the thrust receiving portion 48 is small.

さらに、インペラ体６は、隔壁部材４と対向する面側に裏羽根６６を備えているため、インペラ体６の裏面側と隔壁部材４との間に異物が侵入することを抑制することができる。また、貫通穴４０付近を負圧にすることができるので、第１環状シール部材８が破損しても、貫通穴４０から流体が漏れることを抑制することができる。また、裏羽根６６の外周側端部は、斜めに切断された形状のテーパ面になっているため、糸屑などの異物が裏羽根６６に絡みにくい。   Furthermore, since the impeller body 6 includes the back blade 66 on the surface facing the partition wall member 4, it is possible to prevent foreign matter from entering between the back surface side of the impeller body 6 and the partition wall member 4. . Moreover, since the vicinity of the through hole 40 can be set to a negative pressure, it is possible to prevent fluid from leaking from the through hole 40 even if the first annular seal member 8 is damaged. Moreover, since the outer peripheral side end of the back blade 66 has a tapered surface that is cut obliquely, foreign matter such as yarn waste is less likely to get entangled with the back blade 66.

また、貫通孔４０と回転軸７との隙間部がインペラ体６の裏羽根６６と隔壁部材４７との間より小さい。このため、シール部材８が設けられている円筒状胴部３７（シール部材側）への異物の混入を確実に防止することができる。また、自給式ポンプでは、運転直後はポンプ室内の圧力が変動するが、本形態では、インペラ体６に裏羽根６６を設けるとともに、貫通孔４０の内径と回転軸７の外径との隙間を狭くしてあるので、ポンプ室１内の圧力変動がシール部材８の側に及ぶことを緩和することができる。それ故、シール部材８を用いたシール部での水漏れを抑制することができる。   Further, the gap between the through hole 40 and the rotary shaft 7 is smaller than between the back blade 66 and the partition member 47 of the impeller body 6. For this reason, it is possible to reliably prevent foreign matter from entering the cylindrical body portion 37 (sealing member side) where the sealing member 8 is provided. In the self-contained pump, the pressure in the pump chamber fluctuates immediately after operation. In this embodiment, the impeller body 6 is provided with the back blade 66 and a gap between the inner diameter of the through hole 40 and the outer diameter of the rotary shaft 7 is provided. Since it is made narrow, it can ease that the pressure fluctuation in the pump chamber 1 reaches the seal member 8 side. Therefore, water leakage at the seal portion using the seal member 8 can be suppressed.

さらにまた、回転軸７においてモータ部２側に位置する端部には、ステータコイル２７に対してモータ軸線Ｌ方向で対向する底板部２１８を備えた金属製のロータケース２１が連結され、底板部２１８においてステータコイル２７と対向する面には絶縁シート２３が貼付されている。このため、本形態のポンプ装置１００では、ステータコイル２７と回転軸７との間には、ステータコイル２７とロータケース２１に貼付された絶縁シート２３との間に介在する空気層からなる第１絶縁層と、複数枚の絶縁シート２３からなる第２絶縁層とが設けられているため、絶縁性能に優れている。しかも、かかる絶縁構造であれば、ポンプ装置１００内の狭い隙間に設けることができるので、ポンプ装置１００の小型化を図るのに適している。   Furthermore, a metal rotor case 21 having a bottom plate portion 218 that faces the stator coil 27 in the direction of the motor axis L is connected to an end portion of the rotary shaft 7 that is located on the motor portion 2 side. In 218, an insulating sheet 23 is affixed to the surface facing the stator coil 27. For this reason, in the pump device 100 according to the present embodiment, a first air layer is formed between the stator coil 27 and the rotating shaft 7 and includes an air layer interposed between the stator coil 27 and the insulating sheet 23 attached to the rotor case 21. Since the insulating layer and the second insulating layer composed of a plurality of insulating sheets 23 are provided, the insulating performance is excellent. In addition, such an insulating structure can be provided in a narrow gap in the pump device 100, which is suitable for downsizing the pump device 100.

１ ポンプ室（流体室）
２ モータ部（電磁部）
３ ポンプケース（固定部材）
４ 隔壁部材（固定部材）
５ ホルダ部材（固定部材）
６ インペラ体
７ 回転軸
８ 第１環状シール部材
１１ 固定部材
２１ ロータケース
２２ ロータマグネット
２３ 絶縁シート
２４、２５ ラジアル軸受
２６ ステータコア
２７ ステータコイル
４０ 貫通穴
４８ スラスト受け部
５１ シール部材収納用筒部
６１ 表羽根
６６ 裏羽根
６５ 連結用円筒部
６９ スラストワッシャ（摺動部材）
８０ 環状空間
９１ 第２環状シール部材
１００ ポンプ装置（流体装置） 1 Pump chamber (fluid chamber)
2 Motor part (electromagnetic part)
3 Pump case (fixing member)
4 Bulkhead member (fixing member)
5 Holder member (fixing member)
6 Impeller body 7 Rotating shaft 8 First annular seal member 11 Fixing member 21 Rotor case 22 Rotor magnet 23 Insulating sheet 24, 25 Radial bearing 26 Stator core 27 Stator coil 40 Through hole 48 Thrust receiving portion 51 Seal member receiving cylinder portion 61 Table Blade 66 Back blade 65 Connecting cylindrical part 69 Thrust washer (sliding member)
80 annular space 91 second annular seal member 100 pump device (fluid device)

Claims (8)

ロータおよびステータコイルが配置された電磁部と、インペラ体が配置された流体室と、該流体室と前記電磁部との間に介在する隔壁部材を含む複数の固定部材と、を有し、前記隔壁部材に形成された貫通穴を前記電磁部から回転軸が貫通して前記インペラ体に連結された流体装置において、
前記複数の固定部材のいずれか１つの固定部材には、前記隔壁部材に対して前記電磁部が位置する側で前記回転軸の外周面との間に環状空間を構成するシール部材収納用筒部が形成され、
前記環状空間には、前記回転軸の外周面および前記シール部材収納用筒部の内周面に接する第１環状シール部材が設けられていることを特徴とする流体装置。 An electromagnetic part in which a rotor and a stator coil are arranged, a fluid chamber in which an impeller body is arranged, and a plurality of fixing members including a partition member interposed between the fluid chamber and the electromagnetic part, In the fluid device in which a rotating shaft passes through the through hole formed in the partition member from the electromagnetic part and is connected to the impeller body,
Any one of the plurality of fixing members includes a sealing member housing cylinder portion that forms an annular space between the partition member and the outer peripheral surface of the rotating shaft on the side where the electromagnetic portion is located. Formed,
The fluid device, wherein the annular space is provided with a first annular seal member that is in contact with an outer peripheral surface of the rotating shaft and an inner peripheral surface of the sealing member housing cylinder portion. 前記複数の固定部材のうち、前記シール部材収納用筒部が形成されている固定部材は、前記回転軸に対するラジアル軸受を保持するホルダ部材であることを特徴とする請求項１に記載の流体装置。   2. The fluid device according to claim 1, wherein among the plurality of fixing members, the fixing member in which the sealing member housing cylinder portion is formed is a holder member that holds a radial bearing with respect to the rotating shaft. . 前記環状空間より外周側では、前記隔壁部材と前記ホルダ部材との間に第２環状シール部材が挟持されていることを特徴とする請求項２に記載の流体装置。   3. The fluid device according to claim 2, wherein a second annular seal member is sandwiched between the partition member and the holder member on the outer peripheral side of the annular space. 前記貫通穴の内径寸法は、前記シール部材収納用筒部の内径寸法より小さく、
前記環状空間において前記隔壁部材が位置する側の開口は、当該隔壁部材によって略封鎖されていることを特徴とする請求項２または３に記載の流体装置。 The inner diameter dimension of the through hole is smaller than the inner diameter dimension of the sealing member storage cylinder portion,
The fluid device according to claim 2 or 3, wherein the opening on the side where the partition member is located in the annular space is substantially sealed by the partition member. 前記隔壁部材において前記流体室が位置する側に、前記インペラ体に直接あるいは摺動部材を介して当接して当該インペラ体および前記回転軸の前記電磁部側への変位を規制するスラスト受け部が設けられていることを特徴とする請求項４に記載の流体装置。   A thrust receiving portion that restricts displacement of the impeller body and the rotating shaft toward the electromagnetic portion side by contacting the impeller body directly or via a sliding member on a side where the fluid chamber is located in the partition member. The fluid device according to claim 4, wherein the fluid device is provided. 前記インペラ体は、前記隔壁部材と対向する面側に、放射状に延在する複数の裏羽根を備え、
当該裏羽根は、前記インペラ体において前記スラスト受け部と対向する環状領域の外周縁から径方向外側に延在していることを特徴とする請求項５に記載の流体装置。 The impeller body includes a plurality of back blades extending radially on the surface facing the partition member,
The fluid device according to claim 5, wherein the back blade extends radially outward from an outer peripheral edge of an annular region facing the thrust receiving portion in the impeller body. 前記回転軸において前記流体室が位置する側とは反対側の端部には、前記ステータコイルに対して軸線方向で対向する底板部を備えた金属製のロータケースが連結され、
前記底板部において前記ステータコイルと対向する面には絶縁シートが貼付されていることを特徴とする請求項１乃至６の何れか一項に記載の流体装置。 A metal rotor case having a bottom plate portion that is opposed to the stator coil in the axial direction is connected to an end portion of the rotating shaft opposite to a side where the fluid chamber is located,
The fluid apparatus according to claim 1, wherein an insulating sheet is attached to a surface of the bottom plate portion that faces the stator coil. 請求項１乃至７の何れか一項に記載の流体装置からなることを特徴とするポンプ装置。   A pump device comprising the fluid device according to any one of claims 1 to 7.
JP2009130167A 2009-05-29 2009-05-29 Fluid device and pump device Expired - Fee Related JP5410841B2 (en)

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