WO2021241146A1 - Motor pump - Google Patents

Motor pump Download PDF

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Publication number
WO2021241146A1
WO2021241146A1 PCT/JP2021/017313 JP2021017313W WO2021241146A1 WO 2021241146 A1 WO2021241146 A1 WO 2021241146A1 JP 2021017313 W JP2021017313 W JP 2021017313W WO 2021241146 A1 WO2021241146 A1 WO 2021241146A1
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WO
WIPO (PCT)
Prior art keywords
pump
impeller
motor
casing
wall surface
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Application number
PCT/JP2021/017313
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French (fr)
Japanese (ja)
Inventor
銀春 曹
浩忠 長野
優 今川
健太 則定
Original Assignee
三相電機株式会社
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Application filed by 三相電機株式会社 filed Critical 三相電機株式会社
Priority to JP2022527623A priority Critical patent/JPWO2021241146A1/ja
Publication of WO2021241146A1 publication Critical patent/WO2021241146A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow

Definitions

  • the present invention relates to a motor pump, and more particularly to a technique for preventing wear of an impeller or the like.
  • Patent Document 1 discloses a canned type motor pump. This type of motor pump or magnet type motor pump has a relatively large play (usually about 1 mm) in the axial direction of the pump shaft. Further, the impeller of this type of motor pump is attached so as to be movable in the axial direction with respect to the pump shaft.
  • the motor pump is usually used with the axial direction oriented horizontally, but if the motor pump is used with the axial direction oriented vertically, the impeller descends due to its own weight when the operation is stopped. Contact the wall of the casing. When the operation is started in this state, the impeller starts to rotate in a state of being in contact with the wall surface of the pump casing, so that the side surface of the impeller and the wall surface of the pump casing are more likely to be worn.
  • the present invention has been devised in view of the above problems, and an object of the present invention is to provide a motor pump capable of suppressing the side surface of an impeller from coming into contact with a wall surface of a pump casing and being worn. ..
  • the motor pump according to the first aspect of the present invention includes a rotating portion of a motor fixed to a pump shaft, and first bearings and second bearings that rotatably support the pump shaft on both sides of the rotating portion of the motor.
  • a cascade impeller hereinafter referred to as "impeller" provided so as to rotate integrally with the pump shaft and at the same time be movable in the axial direction, and the motor and the impeller on the radial outer side of the first bearing. It includes an intermediate casing formed between them, and a pump casing main body that constitutes a pump casing accommodating the impeller together with the intermediate casing.
  • the motor pump is supported by the first bearing and the second bearing so that the pump shaft has play in the axial direction.
  • the impeller In a state where the rotating portion of the motor is in contact with the first bearing, the impeller is moved to the pump casing main body side of the impeller so that a predetermined value of clearance is secured between the side surface of the impeller and the wall surface of the pump casing main body.
  • a regulating member that regulates the movement of the pump shaft is fixed to the pump shaft.
  • a protrusion protruding toward the side surface of the impeller is formed on the wall surface of the intermediate casing.
  • the motor pump having such a configuration, it is possible to prevent the side surface of the impeller from coming into contact with the wall surface of the pump casing and being worn.
  • the motor pump according to the second aspect of the present invention is the motor pump according to the first aspect, and the predetermined value is 0.03 mm to 0.07 mm, from the wall surface of the pump casing main body to the wall surface of the intermediate casing.
  • the difference between the dimension and the thickness dimension of the impeller is 0.13 mm to 0.17 mm.
  • the motor pump according to the third aspect of the present invention is the motor pump according to the second aspect, and the protrusion dimension of the protrusion from the wall surface of the intermediate casing is 0.01 mm to 0.03 mm.
  • the motor pump according to the fourth aspect of the present invention further includes a spacer externally fitted and fixed to the pump shaft in the motor pump according to the first to third aspects.
  • the impeller is integrally rotated with respect to the spacer and is fitted so as to be movable in the axial direction at the same time.
  • the restricting member is fixed to the spacer on the side opposite to the intermediate casing of the impeller.
  • the motor pump according to the fifth aspect of the present invention is the motor pump according to the first to fourth aspects, and the pump chamber formed in the pump casing is composed of a substantially columnar space accommodating the pump shaft. It has a first part and a second part formed between the wall surface of the intermediate casing and the wall surface of the pump casing main body.
  • the flow path of the liquid is such that the pressure of the liquid located on the first bearing side of the impeller in the first part is higher than the pressure of the liquid located on the regulating member side of the impeller in the first part. It is formed in the motor pump.
  • the motor pump according to the sixth aspect of the present invention is the motor pump according to the first to fifth aspects, in which a through hole is formed in the pump shaft along the axis thereof.
  • the through hole has a reduced diameter portion whose diameter is reduced from the end portion on the motor side toward the end portion on the pump side.
  • the motor pump according to the present invention it is possible to prevent the side surface of the impeller from coming into contact with the wall surface of the pump casing and being worn.
  • FIG. 1 It is a bottom view of the motor pump shown in FIG. 1. It is an enlarged view of the part A of FIG. 1, and is the figure which shows the state which the impeller is in the center position of both wall surfaces of a pump casing.
  • FIG. 3 is an enlarged view of part B in FIG. It is an enlarged view of the part A of FIG. 1, and is the figure which shows the state which the downward movement of an impeller is restricted by a regulation member.
  • FIG. 5 is an enlarged view of part B in FIG. It is the figure which looked at the 2nd intermediate casing from the impeller side in the axial direction. The protruding part is painted black. It is a perspective view which looked at the impeller side of the 2nd intermediate casing. It is a figure which shows the rotating part of a pump shaft and a motor.
  • the motor pump 1 according to the present embodiment is provided with the motor 2 and the pump 3 integrally. A rotating portion 6 of the motor 2 and an impeller 7 of the pump 3 are provided on the pump shaft 4.
  • a canned motor pump 1 will be described as an example.
  • the motor pump 1 can also be used with the pump shaft 4 oriented in the horizontal direction.
  • each part of the motor pump 1 will be described in detail, but a case where the motor pump 1 is used with the pump shaft 4 oriented in the horizontal direction will also be appropriately described.
  • the motor 2 includes a rotating portion 6 and a stator 9.
  • the rotating portion 6 includes a rotor 13, a bearing washer 14, and the like.
  • the rotating portion 6 is fixed to the pump shaft 4 so as to rotate integrally with the pump shaft 4.
  • the rotor 13 includes a bracket 16 fixed to the pump shaft 4 and a magnet 17 (including a yoke) supported by the bracket 16.
  • the stator 9 is housed between the mold 11 formed in a substantially bottomed cylindrical shape and the back casing 12 fitted in the mold 11.
  • the stator 9 is composed of an electromagnetic coil or the like.
  • a fixing plate 8 is fitted on the upper part of the mold 11. The fixing plate 8 is fastened to the pump base 10 arranged under the end casing 23, which will be described later, with bolts 15.
  • the pump shaft 4 is rotatably supported by a first bearing 21 provided in the intermediate casing 19 described later and a second bearing 22 provided in the back casing 12.
  • first bearing 21 is provided below the rotating portion 6 of the motor 2
  • second bearing 22 is provided above the rotating portion 6 of the motor 2.
  • the lower bearing washer 14 abuts (contacts) the first bearing 21 due to the weight of the rotating portion 6 of the motor 2 and the weight of the pump shaft 4.
  • the upper bearing washer 14 is separated from the second bearing 22 by a predetermined dimension (for example, about 1 mm). This predetermined dimension is the amount of play that the pump shaft 4 has in the axial direction.
  • the pump 3 includes an impeller 7, an intermediate casing 19, an end casing 23, a regulating member 24, and the like.
  • the impeller 7 is provided on the pump shaft 4 below the first bearing 21. Specifically, the impeller 7 is provided so as to rotate integrally with the pump shaft 4 and at the same time to be movable in the axial direction.
  • the impeller 7 is a cascade impeller.
  • the impeller 7 includes a boss portion 7A, a disc portion 7B extending radially outward from the boss portion 7A, and a wing portion 7C formed on the outer periphery of the disc portion 7B. ing.
  • the impeller 7 is made of, for example, a resin material (for example, a PPS resin containing carbon fiber).
  • the boss portion 7A is externally fitted to a substantially cylindrical spacer 26 fixed to the pump shaft 4 (see FIG.
  • a key 27 is fitted to the outer peripheral portion of the spacer 26 so as to face the axial direction.
  • the key 27 is fitted (freely fitted) into the key groove 7Aa formed on the inner peripheral surface of the boss portion 7A of the impeller 7.
  • the impeller 7 is provided so as not to rotate with respect to the pump shaft 4, and is provided so as to be movable in the axial direction with respect to the pump shaft 4.
  • the spacer 26 is fixed to the pump shaft 4 by using a tolerance ring 28.
  • the intermediate casing 19 constitutes the pump casing 20 together with the end casing 23 which is the main body of the pump casing.
  • a pump chamber 30 is formed inside the pump casing 20 (see FIG. 3).
  • the intermediate casing 19 is formed between the motor 2 and the impeller 7 on the radial outer side of the first bearing 21.
  • the intermediate casing 19 is fixed to the flange portion 12a formed around the opening of the back casing 12.
  • a boss portion 19b is formed on the inner diameter side of the intermediate casing 19.
  • the first bearing 21 is fixedly installed on the inner diameter side of the boss portion 19b.
  • the intermediate casing 19 is configured by joining two members, a first intermediate casing 19A arranged on the motor 2 side and a second intermediate casing 19B arranged on the pump chamber 30 side.
  • the first intermediate casing 19A is constructed by using, for example, stainless steel (for example, SUS304).
  • the second intermediate casing 19B is configured by using, for example, a resin material (for example, a PPS resin containing glass fiber).
  • the pump chamber 30 is composed of a first part 30A, a second part 30B, and a third part 30C.
  • the first portion 30A is composed of a substantially columnar space, and accommodates the pump shaft 4, the boss portion 7A of the impeller 7, and the like.
  • the second part 30B accommodates the disc part 7B of the impeller 7.
  • the third part 30C accommodates the wing portion 7C of the impeller 7.
  • the pressure of the liquid located on the upper side (first bearing 21 side) of the impeller 7 in the first part 30A is lower than the impeller 7 in the first part 30A (regulatory member 24).
  • the liquid flow path is formed so as to be higher than the pressure of the liquid located on the side).
  • the boss portion 7A of the impeller 7 is located below the impeller 7 (regulator member 24 side) so as to be in contact with the regulation member 24 described later due to the difference between the two pressures.
  • the inner diameter D1 of the first portion 30A is set to be larger than the inner diameter D2 of the first portion 30A located above the impeller 7 (the receiving side of the first shaft 21).
  • the pump shaft 4 is formed with a through hole 4b along its axis 4a.
  • the through hole 4b has a reduced diameter portion that is reduced in diameter downward (reduced in diameter from the end portion on the motor 2 side toward the end portion on the pump 3 side).
  • the through hole 4b has a first reduced diameter portion 4c whose diameter is reduced downward at a predetermined angle and an angle larger than the predetermined angle downward from the lower end of the first reduced diameter portion 4c.
  • It has a second diameter-reduced portion 4d that is reduced in diameter at.
  • the lower portion 4e of the second reduced diameter portion 4d has a constant inner diameter.
  • the second portion 30B of the pump chamber 30 is formed between the wall surface 19a of the intermediate casing 19 and the wall surface 23a of the end casing 23.
  • the separation dimension L1 between the wall surfaces 19a and 23a is slightly larger than the thickness T of the disc portion 7B of the impeller 7.
  • the difference between the separation dimension L1 and the thickness T of the disc portion 7B can be, for example, within 0.15 mm ⁇ 0.02 mm, that is, 0.13 mm to 0.17 mm.
  • the third part 30C of the pump chamber 30 communicates with the suction port 31 for sucking the liquid and the discharge port 32 for discharging the liquid when the impeller 7 rotates.
  • the regulating member 24 is composed of a substantially cylindrical member having a female screw penetrating in the radial direction. The regulating member 24 is fixed to the spacer 26 by screwing the set screw 34 into the female screw in a state of being fitted to the spacer 26 on the lower side of the impeller 7 (in a state of being fitted externally). ..
  • a protrusion 35 protruding toward the side surface of the disc portion 7B of the impeller 7 is formed on the wall surface 19a of the intermediate casing 19 (the upper wall surface of the pump casing 20). (See Fig. 3). As shown in FIG. 3, when the impeller 7 is in the intermediate position between the wall surface 23a of the end casing 23 and the wall surface 19a of the intermediate casing 19, the protrusion 35 does not come into contact with the side surface of the disc portion 7B of the impeller 7. The dimensions of the protrusion 35 are set.
  • the dimension of the protrusion 35 protruding from the wall surface 19a of the intermediate casing 19 is set to be within 0.02 mm ⁇ 0.01 mm, that is, 0.01 mm to 0.03 mm.
  • a plurality (for example, four) of the protrusions 35 are provided at equal intervals in the circumferential direction.
  • the protrusion 35 has a small size that abuts on a part of the side surface of the disc portion 7B of the impeller 7.
  • the protrusion 35 is provided at a position closest to the pump shaft 4 on the wall surface 19a of the intermediate casing 19 (second intermediate casing 19B). Further, as shown in FIG.
  • a strip 19d protruding from the inner peripheral surface 19c of the second intermediate casing 19B forming the first portion 30A of the pump chamber 30 toward the center side (pump shaft 4 side) and parallel to the axial direction is inside. It is formed on the peripheral surface 19c.
  • the protrusion 35 is formed by the end portion of the strip 19d on the impeller 7 side protruding in the axial direction from the wall surface 19a.
  • the impeller 7 When the liquid is pumped by using the motor pump 1 configured as described above, the impeller 7 is lowered by its own weight until the bearing washer 14 of the rotating portion 6 of the motor comes into contact with the first bearing 21 when the operation is stopped. The impeller 7 is prevented from moving below a predetermined position by the regulating member 24. Therefore, a predetermined value of clearance is always secured between the impeller 7 and the wall surface 23a of the end casing 23. Therefore, at the start of operation, the impeller 7 rotates in a non-contact state with respect to the wall surface 23a of the end casing 23, and the lower side surface of the impeller 7 and the wall surface 23a of the end casing 23 do not wear.
  • the impeller 7 moves in one axial direction until the bearing washer 14 of the rotating portion 6 of the motor comes into contact with the first bearing 21 due to the positional relationship with the first bearing 21.
  • the impeller 7 does not move in one axial direction from the predetermined position due to the regulating member 24. Therefore, even when the motor pump 1 is used with the pump shaft 4 oriented in the horizontal direction, a predetermined value of clearance is always secured between the impeller 7 and the wall surface 23a of the end casing 23. Therefore, at the start of operation, the impeller 7 rotates in a non-contact state with respect to the wall surface 23a of the end casing 23, and the side surface of the impeller 7 and the wall surface 23a of the end casing 23 do not wear.
  • the impeller 7 moves irregularly in the vertical direction until a certain rotation speed is reached (in the case where the motor pump 1 is used with the pump shaft 4 oriented in the horizontal direction).
  • the impeller 7 moves irregularly in the axial direction) and may approach the wall surface 19a of the intermediate casing 19.
  • the protrusion 35 is formed on the wall surface 19a of the intermediate casing 19
  • the impeller 7 abuts on the protrusion 35 even if the impeller 7 approaches the wall surface 19a. Therefore, the impeller 7 does not rise any further and come into contact with the wall surface 19a. Therefore, the wall surface 19a of the intermediate casing 19 does not come into contact with the impeller 7 and wear.
  • the protrusion 35 has a small area seen from the axial direction, the disc portion 7B of the impeller 7 is less likely to be worn even if it comes into contact with the disc portion 7B of the impeller 7. Even if the disc portion 7B of the impeller 7 is worn, the worn portion is limited to a very small part, so that the performance of the pump is hardly affected.
  • the inner diameter D1 of the first portion 30A is set to be larger than the inner diameter D2 of the first portion 30A located above the impeller 7 (the receiving side of the first shaft 21). This contributes to the prevention of wear between the side surface of the impeller 7 and the wall surface 23a of the end casing 23.
  • a flow path is formed in which the pressure of the liquid applied to the upper end portion of the pump shaft 4 becomes larger than the pressure of the liquid applied to the lower end portion of the pump shaft 4 during normal operation. .. Further, the inner diameter of the through hole 4b formed in the pump shaft 4 is reduced from the upper side to the lower side so that the boss portion 7A of the impeller 7 is more easily in contact with the regulation member 24 by increasing the difference in pressure between them. The diameter is reduced (reduced from the end on the motor 2 side toward the end on the pump 3 side).
  • the through hole 4b provided in the pump shaft 4 has the first reduced diameter portion 4c and the second reduced diameter portion 4d described above, the air in the upper part in the back casing 12 The flow rate through which the casing 4b passes through the through hole 4b is suppressed, and the generation of a sudden negative pressure can be prevented. As a result, the impeller 7 suddenly behaves upward, and the load on the protrusion 35 receiving the impeller 7 does not increase.
  • the through hole 4b provided in the pump shaft 4 has the first reduced diameter portion 4c and the second reduced diameter portion 4d described above, the air in the inner part of the back casing 12 is provided.
  • the flow rate through which the casing 4b passes through the through hole 4b is suppressed, and the generation of a sudden negative pressure can be prevented.
  • the impeller 7 suddenly behaves in the other direction in the axial direction, and the load on the protrusion 35 receiving the impeller 7 does not increase.
  • the present invention can be applied to, for example, a canned motor pump.

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

Abstract

A motor pump according to the present invention has a restriction member (24) that, in a state in which a rotating part (6) of a motor (2) is in contact with a first bearing (21), is fixed to a pump shaft (4) and restricts movement of an impeller (7) toward a pump casing body (23) side so as to maintain a clearance of a prescribed value between a side surface of the impeller (7) and a wall surface (23a) of the pump casing body (23). A protrusion (35) which protrudes toward a side surface of the impeller (7) is formed on a wall surface (19a) of a middle casing (19). When the impeller (7) is in a middle position between the wall surface (23a) of the pump casing body (23) and the wall surface (19a) of the middle casing (19), the projection size of the protrusion (35) from the wall surface (19a) of the middle casing (19) is set such that the protrusion (35) does not contact the side surface on the middle casing side of the impeller (7).

Description

モータポンプMotor pump
　本発明は、モータポンプに関し、特にインペラ等の摩耗を防止する技術に関する。
　本願は、２０２０年５月２６日に日本で出願された特願２０２０－０９１００７号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a motor pump, and more particularly to a technique for preventing wear of an impeller or the like.
This application claims priority based on Japanese Patent Application No. 2020-091007 filed in Japan on May 26, 2020, the contents of which are incorporated herein by reference.
　例えば特許文献１には、キャンド方式のモータポンプが開示されている。この種のモータポンプやマグネット方式のモータポンプでは、ポンプシャフトの軸方向に比較的大きな遊び（通常１ｍｍ程度）が持たされている。また、この種のモータポンプのインペラは、ポンプシャフトに対して軸方向に移動可能に取り付けられている。 For example, Patent Document 1 discloses a canned type motor pump. This type of motor pump or magnet type motor pump has a relatively large play (usually about 1 mm) in the axial direction of the pump shaft. Further, the impeller of this type of motor pump is attached so as to be movable in the axial direction with respect to the pump shaft.
特許第５１７３６１９号公報Japanese Patent No. 5173619
　上記モータポンプにおいて、インペラが回転し始めた後は、インペラの軸方向位置が安定する回転速度に至るまで、インペラは軸方向に不規則に移動する。このとき、インペラは、ポンプケーシングの壁面に接触する。その結果、インペラの側面とポンプケーシングの壁面とに摩耗が生じる。 In the above motor pump, after the impeller starts to rotate, the impeller moves irregularly in the axial direction until the rotational speed at which the axial position of the impeller stabilizes is reached. At this time, the impeller comes into contact with the wall surface of the pump casing. As a result, wear occurs on the side surface of the impeller and the wall surface of the pump casing.
　このように、インペラの側面やポンプケーシングの壁面に摩耗が生じると、それらの間のクリアランスが大きくなる。クリアランスが大きくなると、ポンプの性能が低下してしまう。 In this way, when the side surface of the impeller and the wall surface of the pump casing are worn, the clearance between them becomes large. If the clearance is large, the performance of the pump will deteriorate.
　また、上記モータポンプは、通常、軸方向を水平方向に向けて使用されるが、仮に上記モータポンプの軸方向を上下に向けて使用する場合、運転停止時には、インペラは自重により下降してポンプケーシングの壁面に接触する。この状態で運転を開始すると、インペラがポンプケーシングの壁面に接触した状態で回転し始めるため、インペラの側面とポンプケーシングの壁面とにさらに摩耗が生じやすくなる。 Further, the motor pump is usually used with the axial direction oriented horizontally, but if the motor pump is used with the axial direction oriented vertically, the impeller descends due to its own weight when the operation is stopped. Contact the wall of the casing. When the operation is started in this state, the impeller starts to rotate in a state of being in contact with the wall surface of the pump casing, so that the side surface of the impeller and the wall surface of the pump casing are more likely to be worn.
　本発明は、かかる課題に鑑みて創案されたものであり、インペラの側面がポンプケーシングの壁面と接触して摩耗してしまうことを抑制することが可能なモータポンプを提供することを目的とする。 The present invention has been devised in view of the above problems, and an object of the present invention is to provide a motor pump capable of suppressing the side surface of an impeller from coming into contact with a wall surface of a pump casing and being worn. ..
　本発明の第１態様に係るモータポンプは、ポンプシャフトに固定されたモータの回転部と、前記モータの回転部の両側で前記ポンプシャフトを回転自在に支持する第１軸受および第２軸受と、前記ポンプシャフトに対して一体で回転すると同時に、軸方向へ移動可能に設けられたカスケードインペラ（以下「インペラ」という。）と、前記第１軸受の半径方向外側で、前記モータと前記インペラとの間に形成された中間ケーシングと、前記インペラを収容するポンプケーシングを前記中間ケーシングとともに構成するポンプケーシング本体と、を備える。前記モータポンプは、前記ポンプシャフトが軸方向に遊びを有するように前記第１軸受および前記第２軸受に支持されたものである。前記モータの回転部が前記第１軸受に接触した状態で、前記インペラの側面と前記ポンプケーシング本体の壁面との間に所定値のクリアランスが確保されるよう、前記インペラの前記ポンプケーシング本体側への移動を規制する規制部材が前記ポンプシャフトに対して固定されている。前記中間ケーシングの壁面に前記インペラの側面に向かって突出した突起が形成されている。前記インペラが前記ポンプケーシング本体の壁面と前記中間ケーシングの壁面との間の中間位置にあるとき、前記突起が前記インペラの中間ケーシング側の側面に接しないように、前記突起の前記中間ケーシングの壁面からの突出寸法が設定されている。 The motor pump according to the first aspect of the present invention includes a rotating portion of a motor fixed to a pump shaft, and first bearings and second bearings that rotatably support the pump shaft on both sides of the rotating portion of the motor. A cascade impeller (hereinafter referred to as "impeller") provided so as to rotate integrally with the pump shaft and at the same time be movable in the axial direction, and the motor and the impeller on the radial outer side of the first bearing. It includes an intermediate casing formed between them, and a pump casing main body that constitutes a pump casing accommodating the impeller together with the intermediate casing. The motor pump is supported by the first bearing and the second bearing so that the pump shaft has play in the axial direction. In a state where the rotating portion of the motor is in contact with the first bearing, the impeller is moved to the pump casing main body side of the impeller so that a predetermined value of clearance is secured between the side surface of the impeller and the wall surface of the pump casing main body. A regulating member that regulates the movement of the pump shaft is fixed to the pump shaft. A protrusion protruding toward the side surface of the impeller is formed on the wall surface of the intermediate casing. When the impeller is at an intermediate position between the wall surface of the pump casing main body and the wall surface of the intermediate casing, the wall surface of the intermediate casing of the protrusion is prevented from contacting the side surface of the impeller on the intermediate casing side. The protrusion dimension from is set.
　かかる構成を備えるモータポンプによれば、インペラの側面がポンプケーシングの壁面と接触して摩耗してしまうことを抑制することが可能である。 According to the motor pump having such a configuration, it is possible to prevent the side surface of the impeller from coming into contact with the wall surface of the pump casing and being worn.
　本発明の第２態様に係るモータポンプは、第１態様に係るモータポンプにおいて、前記所定値は、０．０３ｍｍ～０．０７ｍｍであり、前記ポンプケーシング本体の壁面から前記中間ケーシングの壁面までの寸法と、前記インペラの厚さ寸法との差が０．１３ｍｍ～０．１７ｍｍである。 The motor pump according to the second aspect of the present invention is the motor pump according to the first aspect, and the predetermined value is 0.03 mm to 0.07 mm, from the wall surface of the pump casing main body to the wall surface of the intermediate casing. The difference between the dimension and the thickness dimension of the impeller is 0.13 mm to 0.17 mm.
　本発明の第３態様に係るモータポンプは、第２態様に係るモータポンプにおいて、前記突起の前記中間ケーシングの壁面からの突出寸法は、０．０１ｍｍ～０．０３ｍｍである。 The motor pump according to the third aspect of the present invention is the motor pump according to the second aspect, and the protrusion dimension of the protrusion from the wall surface of the intermediate casing is 0.01 mm to 0.03 mm.
　本発明の第４態様に係るモータポンプは、第１態様～第３態様に係るモータポンプにおいて、前記ポンプシャフトに外嵌固定されたスペーサを更に備える。前記スペーサに対して前記インペラが一体で回転すると同時に軸方向へ移動可能に嵌め付けられる。前記規制部材は、前記インペラの前記中間ケーシングと反対側において前記スペーサに固定されている。 The motor pump according to the fourth aspect of the present invention further includes a spacer externally fitted and fixed to the pump shaft in the motor pump according to the first to third aspects. The impeller is integrally rotated with respect to the spacer and is fitted so as to be movable in the axial direction at the same time. The restricting member is fixed to the spacer on the side opposite to the intermediate casing of the impeller.
　本発明の第５態様に係るモータポンプは、第１態様～第４態様に係るモータポンプにおいて、前記ポンプケーシング内に形成されたポンプ室は、前記ポンプシャフトを収容した略円柱状の空間からなる第１部と、前記中間ケーシングの壁面と前記ポンプケーシング本体の壁面との間に形成される第２部と、を有する。前記第１部における前記インペラより前記第１軸受側に位置する液体の圧力が、前記第１部における前記インペラより前記規制部材側に位置する液体の圧力よりも高くなるように液体の流路がモータポンプ内に形成されている。前記２つの圧力の差によって前記インペラが前記規制部材に接するように、前記インペラより前記規制部材側に位置する前記第１部の内径が前記インペラより前記第１軸受側に位置する前記第１部の内径より大きく設定されている。 The motor pump according to the fifth aspect of the present invention is the motor pump according to the first to fourth aspects, and the pump chamber formed in the pump casing is composed of a substantially columnar space accommodating the pump shaft. It has a first part and a second part formed between the wall surface of the intermediate casing and the wall surface of the pump casing main body. The flow path of the liquid is such that the pressure of the liquid located on the first bearing side of the impeller in the first part is higher than the pressure of the liquid located on the regulating member side of the impeller in the first part. It is formed in the motor pump. The first part whose inner diameter of the first part located on the regulating member side of the impeller is located on the first bearing side of the impeller so that the impeller comes into contact with the regulating member due to the difference between the two pressures. It is set larger than the inner diameter of.
　本発明の第６態様に係るモータポンプは、第１態様～第５態様に係るモータポンプにおいて、前記ポンプシャフトには、その軸線に沿って貫通穴が形成されている。前記貫通穴は、前記モータ側の端部から前記ポンプ側の端部に向かって縮径した縮径部を有する。 The motor pump according to the sixth aspect of the present invention is the motor pump according to the first to fifth aspects, in which a through hole is formed in the pump shaft along the axis thereof. The through hole has a reduced diameter portion whose diameter is reduced from the end portion on the motor side toward the end portion on the pump side.
　本発明に係るモータポンプによれば、インペラの側面がポンプケーシングの壁面と接触して摩耗してしまうことを抑制できる。 According to the motor pump according to the present invention, it is possible to prevent the side surface of the impeller from coming into contact with the wall surface of the pump casing and being worn.
本発明の実施形態に係るモータポンプの断面図である。It is sectional drawing of the motor pump which concerns on embodiment of this invention. 図１に示すモータポンプの底面図である。It is a bottom view of the motor pump shown in FIG. 1. 図１のＡ部拡大図であって、インペラがポンプケーシングの両壁面の中央位置にある状態を示す図である。It is an enlarged view of the part A of FIG. 1, and is the figure which shows the state which the impeller is in the center position of both wall surfaces of a pump casing. 図３のＢ部拡大図である。FIG. 3 is an enlarged view of part B in FIG. 図１のＡ部拡大図であって、規制部材によってインペラの下方移動が規制されている状態を示す図である。It is an enlarged view of the part A of FIG. 1, and is the figure which shows the state which the downward movement of an impeller is restricted by a regulation member. 図５のＢ部拡大図である。FIG. 5 is an enlarged view of part B in FIG. 第２中間ケーシングをインペラ側から軸方向に視た図である。突起部分は黒色に塗り潰している。It is the figure which looked at the 2nd intermediate casing from the impeller side in the axial direction. The protruding part is painted black. 第２中間ケーシングのインペラ側を視た斜視図である。It is a perspective view which looked at the impeller side of the 2nd intermediate casing. ポンプシャフトおよびモータの回転部を示す図である。It is a figure which shows the rotating part of a pump shaft and a motor.
　以下、本発明の実施形態に係るモータポンプについて、図面を参照しつつ説明する。本実施形態に係るモータポンプ１は、モータ２およびポンプ３が一体的に設けられたものである。ポンプシャフト４上にモータ２の回転部６と、ポンプ３のインペラ７とが設けられている。本実施形態では、キャンド方式のモータポンプ１を例に挙げて説明する。本実施形態では、モータ２を上側、ポンプ３を下側にして、ポンプシャフト４を上下に向けてモータポンプ１を使用する場合を例に挙げて説明する。但し、モータポンプ１は、ポンプシャフト４を水平方向に向けて使用することも可能である。以下、モータポンプ１の各部について詳細に説明するが、ポンプシャフト４を水平方向に向けてモータポンプ１を使用した場合についても必要に応じて適宜説明する。 Hereinafter, the motor pump according to the embodiment of the present invention will be described with reference to the drawings. The motor pump 1 according to the present embodiment is provided with the motor 2 and the pump 3 integrally. A rotating portion 6 of the motor 2 and an impeller 7 of the pump 3 are provided on the pump shaft 4. In this embodiment, a canned motor pump 1 will be described as an example. In the present embodiment, a case where the motor pump 1 is used with the motor 2 on the upper side and the pump 3 on the lower side and the pump shaft 4 facing up and down will be described as an example. However, the motor pump 1 can also be used with the pump shaft 4 oriented in the horizontal direction. Hereinafter, each part of the motor pump 1 will be described in detail, but a case where the motor pump 1 is used with the pump shaft 4 oriented in the horizontal direction will also be appropriately described.
　モータ２は、図１に示すように、回転部６と固定子９とを備える。回転部６は、回転子１３、軸受ワッシャ１４等を含んで構成されている。この回転部６は、ポンプシャフト４と一体回転するようにポンプシャフト４に固定されている。回転子１３は、ポンプシャフト４に対して固定されたブラケット１６と、ブラケット１６に支持されたマグネット１７（ヨークを含む）を備える。 As shown in FIG. 1, the motor 2 includes a rotating portion 6 and a stator 9. The rotating portion 6 includes a rotor 13, a bearing washer 14, and the like. The rotating portion 6 is fixed to the pump shaft 4 so as to rotate integrally with the pump shaft 4. The rotor 13 includes a bracket 16 fixed to the pump shaft 4 and a magnet 17 (including a yoke) supported by the bracket 16.
　固定子９は、略有底円筒状に形成されたモールド１１と、モールド１１内に嵌め込まれたバックケーシング１２との間に収容されている。固定子９は、電磁コイル等で構成されている。固定子９に駆動電流が供給されると、回転部６およびポンプシャフト４が回転駆動する。なお、モールド１１の上部には固定板８が嵌め付けられている。固定板８は、後述するエンドケーシング２３の下に配置されたポンプベース１０に対してボルト１５にて締結されている。 The stator 9 is housed between the mold 11 formed in a substantially bottomed cylindrical shape and the back casing 12 fitted in the mold 11. The stator 9 is composed of an electromagnetic coil or the like. When the drive current is supplied to the stator 9, the rotating portion 6 and the pump shaft 4 are rotationally driven. A fixing plate 8 is fitted on the upper part of the mold 11. The fixing plate 8 is fastened to the pump base 10 arranged under the end casing 23, which will be described later, with bolts 15.
　ポンプシャフト４は、後述する中間ケーシング１９に設けられた第１軸受２１と、バックケーシング１２に設けられた第２軸受２２とに回転自在に支持されている。図１に示すように、ポンプシャフト４上において、第１軸受２１は、モータ２の回転部６より下側に設けられ、第２軸受２２は、モータ２の回転部６より上側に設けられている。通常は（少なくとも運転停止時には）、図１に示すように、モータ２の回転部６の自重とポンプシャフト４の自重とによって、下側の軸受ワッシャ１４が第１軸受２１に当接（接触）し、上側の軸受ワッシャ１４が第２軸受２２から所定寸法（例えば１ｍｍ程度）だけ離間した状態となる。この所定寸法は、ポンプシャフト４が軸方向に有する遊びの量となる。 The pump shaft 4 is rotatably supported by a first bearing 21 provided in the intermediate casing 19 described later and a second bearing 22 provided in the back casing 12. As shown in FIG. 1, on the pump shaft 4, the first bearing 21 is provided below the rotating portion 6 of the motor 2, and the second bearing 22 is provided above the rotating portion 6 of the motor 2. There is. Normally (at least when the operation is stopped), as shown in FIG. 1, the lower bearing washer 14 abuts (contacts) the first bearing 21 due to the weight of the rotating portion 6 of the motor 2 and the weight of the pump shaft 4. Then, the upper bearing washer 14 is separated from the second bearing 22 by a predetermined dimension (for example, about 1 mm). This predetermined dimension is the amount of play that the pump shaft 4 has in the axial direction.
　なお、ポンプシャフト４を水平方向に向けてモータポンプ１を使用した場合も、モータ２の回転部６に含まれるマグネットと、固定子９に含まれる電磁鋼板との位置関係によって、少なくとも運転停止時に、図１に示すように、一方の軸受ワッシャ１４が第１軸受２１に当接（接触）し、他方の軸受ワッシャ１４が第２軸受２２から所定寸法（例えば１ｍｍ程度）だけ離間した状態となる。 Even when the motor pump 1 is used with the pump shaft 4 oriented in the horizontal direction, at least when the operation is stopped, due to the positional relationship between the magnet included in the rotating portion 6 of the motor 2 and the electromagnetic steel plate included in the stator 9. As shown in FIG. 1, one bearing washer 14 is in contact with the first bearing 21 and the other bearing washer 14 is separated from the second bearing 22 by a predetermined dimension (for example, about 1 mm). ..
　ポンプ３は、前記ポンプシャフト４のほか、インペラ７、中間ケーシング１９、エンドケーシング２３、規制部材２４等を備えている。 In addition to the pump shaft 4, the pump 3 includes an impeller 7, an intermediate casing 19, an end casing 23, a regulating member 24, and the like.
　インペラ７は、第１軸受２１より下側でポンプシャフト４上に設けられている。詳細には、インペラ７は、ポンプシャフト４に対して一体で回転すると同時に、軸方向へ移動可能に設けられている。本実施形態では、インペラ７は、カスケードインペラである。また、インペラ７は、図３に示すように、ボス部７Ａと、ボス部７Ａから半径方向外方に延出したディスク部７Ｂと、ディスク部７Ｂの外周に形成された翼部７Ｃとを備えている。インペラ７は、例えば樹脂材（例えばカーボンファイバーを含有するＰＰＳ樹脂）からなる。ボス部７Ａは、ポンプシャフト４に固定された略円筒状のスペーサ２６に外嵌されている（図１参照）。スペーサ２６の外周部には、キー２７が軸方向を向いて嵌め付けられている。キー２７は、インペラ７のボス部７Ａの内周面に形成されたキー溝７Ａａに嵌入（遊嵌）されている。このキー２７によって、インペラ７は、ポンプシャフト４に対して回転不能に設けられ、かつ、ポンプシャフト４に対して軸方向へ移動可能に設けられている。なお、スペーサ２６は、ポンプシャフト４に対して、トレランスリング２８を用いて固定されている。 The impeller 7 is provided on the pump shaft 4 below the first bearing 21. Specifically, the impeller 7 is provided so as to rotate integrally with the pump shaft 4 and at the same time to be movable in the axial direction. In this embodiment, the impeller 7 is a cascade impeller. Further, as shown in FIG. 3, the impeller 7 includes a boss portion 7A, a disc portion 7B extending radially outward from the boss portion 7A, and a wing portion 7C formed on the outer periphery of the disc portion 7B. ing. The impeller 7 is made of, for example, a resin material (for example, a PPS resin containing carbon fiber). The boss portion 7A is externally fitted to a substantially cylindrical spacer 26 fixed to the pump shaft 4 (see FIG. 1). A key 27 is fitted to the outer peripheral portion of the spacer 26 so as to face the axial direction. The key 27 is fitted (freely fitted) into the key groove 7Aa formed on the inner peripheral surface of the boss portion 7A of the impeller 7. By this key 27, the impeller 7 is provided so as not to rotate with respect to the pump shaft 4, and is provided so as to be movable in the axial direction with respect to the pump shaft 4. The spacer 26 is fixed to the pump shaft 4 by using a tolerance ring 28.
　中間ケーシング１９は、ポンプケーシング本体であるエンドケーシング２３とともにポンプケーシング２０を構成する。ポンプケーシング２０の内部にはポンプ室３０が形成されている（図３参照）。図１に示すように、中間ケーシング１９は、第１軸受２１の半径方向外側で、モータ２とインペラ７との間に形成されている。中間ケーシング１９は、バックケーシング１２の開口部の周囲に形成されたフランジ部１２ａに固定されている。 The intermediate casing 19 constitutes the pump casing 20 together with the end casing 23 which is the main body of the pump casing. A pump chamber 30 is formed inside the pump casing 20 (see FIG. 3). As shown in FIG. 1, the intermediate casing 19 is formed between the motor 2 and the impeller 7 on the radial outer side of the first bearing 21. The intermediate casing 19 is fixed to the flange portion 12a formed around the opening of the back casing 12.
　中間ケーシング１９の内径側には、図１に示すように、ボス部１９ｂが形成されている。ボス部１９ｂの内径側に第１軸受２１が固設されている。中間ケーシング１９は、モータ２側に配された第１中間ケーシング１９Ａと、ポンプ室３０側に配された第２中間ケーシング１９Ｂとの２部材が接合されて構成される。第１中間ケーシング１９Ａは、例えばステンレス鋼（例えばＳＵＳ３０４）を用いて構成される。第２中間ケーシング１９Ｂは、例えば樹脂材（例えばグラスファイバーを含有するＰＰＳ樹脂）を用いて構成される。 As shown in FIG. 1, a boss portion 19b is formed on the inner diameter side of the intermediate casing 19. The first bearing 21 is fixedly installed on the inner diameter side of the boss portion 19b. The intermediate casing 19 is configured by joining two members, a first intermediate casing 19A arranged on the motor 2 side and a second intermediate casing 19B arranged on the pump chamber 30 side. The first intermediate casing 19A is constructed by using, for example, stainless steel (for example, SUS304). The second intermediate casing 19B is configured by using, for example, a resin material (for example, a PPS resin containing glass fiber).
　ポンプ室３０は、図３に示すように、第１部３０Ａ、第２部３０Ｂおよび第３部３０Ｃで構成される。第１部３０Ａは、略円柱状の空間からなり、ポンプシャフト４、インペラ７のボス部７Ａ等を収容する。第２部３０Ｂは、インペラ７のディスク部７Ｂを収容する。第３部３０Ｃは、インペラ７の翼部７Ｃを収容する。なお、本実施形態に係るモータポンプ１では、第１部３０Ａにおけるインペラ７より上側（第１軸受２１側）に位置する液体の圧力が、第１部３０Ａにおけるインペラ７より下側（規制部材２４側）に位置する液体の圧力よりも高くなるように液体の流路が形成されている。本実施形態では、上記２つの圧力の差によってインペラ７のボス部７Ａが後述する規制部材２４に接するように、図３に示すように、インペラ７より下側（規制部材２４側）に位置する第１部３０Ａの内径Ｄ１がインペラ７より上側（第１軸２１受側）に位置する第１部３０Ａの内径Ｄ２より大きく設定されている。 As shown in FIG. 3, the pump chamber 30 is composed of a first part 30A, a second part 30B, and a third part 30C. The first portion 30A is composed of a substantially columnar space, and accommodates the pump shaft 4, the boss portion 7A of the impeller 7, and the like. The second part 30B accommodates the disc part 7B of the impeller 7. The third part 30C accommodates the wing portion 7C of the impeller 7. In the motor pump 1 according to the present embodiment, the pressure of the liquid located on the upper side (first bearing 21 side) of the impeller 7 in the first part 30A is lower than the impeller 7 in the first part 30A (regulatory member 24). The liquid flow path is formed so as to be higher than the pressure of the liquid located on the side). In the present embodiment, as shown in FIG. 3, the boss portion 7A of the impeller 7 is located below the impeller 7 (regulator member 24 side) so as to be in contact with the regulation member 24 described later due to the difference between the two pressures. The inner diameter D1 of the first portion 30A is set to be larger than the inner diameter D2 of the first portion 30A located above the impeller 7 (the receiving side of the first shaft 21).
　また、ポンプシャフト４には、その軸線４ａに沿って貫通穴４ｂが形成されている。貫通穴４ｂは、下方に向かって縮径した（モータ２側の端部からポンプ３側の端部に向かって縮径した）縮径部を有する。例えば図９に示すように、貫通穴４ｂは、下方に向かって所定角度で縮径する第１縮径部４ｃと、第１縮径部４ｃの下端から下方に向かって前記所定角度より大きな角度で縮径する第２縮径部４ｄとを有する。なお、図示する例では、第２縮径部４ｄより下部４ｅは、一定内径となっている。 Further, the pump shaft 4 is formed with a through hole 4b along its axis 4a. The through hole 4b has a reduced diameter portion that is reduced in diameter downward (reduced in diameter from the end portion on the motor 2 side toward the end portion on the pump 3 side). For example, as shown in FIG. 9, the through hole 4b has a first reduced diameter portion 4c whose diameter is reduced downward at a predetermined angle and an angle larger than the predetermined angle downward from the lower end of the first reduced diameter portion 4c. It has a second diameter-reduced portion 4d that is reduced in diameter at. In the illustrated example, the lower portion 4e of the second reduced diameter portion 4d has a constant inner diameter.
　ポンプ室３０の第２部３０Ｂは、図３に示すように、中間ケーシング１９の壁面１９ａとエンドケーシング２３の壁面２３ａとの間に形成される。両壁面１９ａ，２３ａの離間寸法Ｌ１は、インペラ７のディスク部７Ｂの厚さＴより僅かに大きい。離間寸法Ｌ１とディスク部７Ｂの厚さＴとの差は、例えば０．１５ｍｍ±０．０２ｍｍ以内、すなわち、０．１３ｍｍ～０．１７ｍｍとすることができる。 As shown in FIG. 3, the second portion 30B of the pump chamber 30 is formed between the wall surface 19a of the intermediate casing 19 and the wall surface 23a of the end casing 23. The separation dimension L1 between the wall surfaces 19a and 23a is slightly larger than the thickness T of the disc portion 7B of the impeller 7. The difference between the separation dimension L1 and the thickness T of the disc portion 7B can be, for example, within 0.15 mm ± 0.02 mm, that is, 0.13 mm to 0.17 mm.
　ポンプ室３０の第３部３０Ｃは、図７に示すように、インペラ７の回転時に、液体を吸込む吸込ポート３１と、液体を吐出する吐出ポート３２とに連通している。 As shown in FIG. 7, the third part 30C of the pump chamber 30 communicates with the suction port 31 for sucking the liquid and the discharge port 32 for discharging the liquid when the impeller 7 rotates.
　規制部材２４は、モータ２の回転部６の軸受ワッシャ１４が第１軸受２１に接触（当接）した状態で、インペラ７のディスク部７Ｂの下側の側面がエンドケーシング２３の壁面２３ａ（ポンプケーシング２０の下側の壁面）との間に所定値のクリアランス（例えば０．０３ｍｍ～０．０７ｍｍのクリアランス）を確保するように、インペラ７の下降（エンドケーシング２３側への移動）を規制する。本実施形態では、規制部材２４は、径方向に貫通する雌ネジが形成された略円筒状の部材からなる。この規制部材２４は、インペラ７の下側においてスペーサ２６に嵌め付けられた状態（外嵌された状態）で、雌ネジに止めネジ３４がねじ込まれることによって、当該スペーサ２６に対して固定される。 In the regulating member 24, the lower side surface of the disc portion 7B of the impeller 7 is the wall surface 23a (pump) of the end casing 23 in a state where the bearing washer 14 of the rotating portion 6 of the motor 2 is in contact (contact) with the first bearing 21. The lowering of the impeller 7 (movement to the end casing 23 side) is restricted so as to secure a predetermined value of clearance (for example, a clearance of 0.03 mm to 0.07 mm) with the lower wall surface of the casing 20. .. In the present embodiment, the regulating member 24 is composed of a substantially cylindrical member having a female screw penetrating in the radial direction. The regulating member 24 is fixed to the spacer 26 by screwing the set screw 34 into the female screw in a state of being fitted to the spacer 26 on the lower side of the impeller 7 (in a state of being fitted externally). ..
　一方、インペラ７のディスク部７Ｂより上側にあっては、中間ケーシング１９の壁面１９ａ（ポンプケーシング２０の上側の壁面）に、インペラ７のディスク部７Ｂの側面に向かって突出した突起３５が形成されている（図３参照）。図３に示すように、インペラ７がエンドケーシング２３の壁面２３ａと中間ケーシング１９の壁面１９ａとの間の中間位置にあるとき、突起３５がインペラ７のディスク部７Ｂの側面に接触しないように、当該突起３５の寸法が設定されている。本実施形態では、突起３５が中間ケーシング１９の壁面１９ａから突出する寸法は、０．０２ｍｍ±０．０１ｍｍ以内、すなわち、０．０１ｍｍ～０．０３ｍｍに設定されている。図７および図８に示すように、突起３５は周方向に等間隔で複数（例えば４個）設けられている。また、突起３５は、インペラ７のディスク部７Ｂの側面の一部に当接する小さなサイズとされている。本実施形態では、図７に示すように、突起３５は、中間ケーシング１９（第２中間ケーシング１９Ｂ）の壁面１９ａの最もポンプシャフト４に近い位置に設けられている。また、図８に示すように、ポンプ室３０の第１部３０Ａを形成する第２中間ケーシング１９Ｂの内周面１９ｃから中心側（ポンプシャフト４側）に突出し軸方向に平行な条１９ｄが内周面１９ｃに形成されている。条１９ｄのインペラ７側の端部が壁面１９ａより軸方向に突出することにより上記突起３５が形成されている。 On the other hand, on the upper side of the disc portion 7B of the impeller 7, a protrusion 35 protruding toward the side surface of the disc portion 7B of the impeller 7 is formed on the wall surface 19a of the intermediate casing 19 (the upper wall surface of the pump casing 20). (See Fig. 3). As shown in FIG. 3, when the impeller 7 is in the intermediate position between the wall surface 23a of the end casing 23 and the wall surface 19a of the intermediate casing 19, the protrusion 35 does not come into contact with the side surface of the disc portion 7B of the impeller 7. The dimensions of the protrusion 35 are set. In the present embodiment, the dimension of the protrusion 35 protruding from the wall surface 19a of the intermediate casing 19 is set to be within 0.02 mm ± 0.01 mm, that is, 0.01 mm to 0.03 mm. As shown in FIGS. 7 and 8, a plurality (for example, four) of the protrusions 35 are provided at equal intervals in the circumferential direction. Further, the protrusion 35 has a small size that abuts on a part of the side surface of the disc portion 7B of the impeller 7. In the present embodiment, as shown in FIG. 7, the protrusion 35 is provided at a position closest to the pump shaft 4 on the wall surface 19a of the intermediate casing 19 (second intermediate casing 19B). Further, as shown in FIG. 8, a strip 19d protruding from the inner peripheral surface 19c of the second intermediate casing 19B forming the first portion 30A of the pump chamber 30 toward the center side (pump shaft 4 side) and parallel to the axial direction is inside. It is formed on the peripheral surface 19c. The protrusion 35 is formed by the end portion of the strip 19d on the impeller 7 side protruding in the axial direction from the wall surface 19a.
　以上のように構成されたモータポンプ１を用いて液体を圧送する場合、運転停止時には、モータの回転部６の軸受ワッシャ１４が第１軸受２１に当接するまで、インペラ７が自重により下降するが、インペラ７は、規制部材２４によって所定位置より下方へ移動しないようになっている。このため、インペラ７とエンドケーシング２３の壁面２３ａとの間に所定値のクリアランスが必ず確保される。故に、運転開始時には、インペラ７はエンドケーシング２３の壁面２３ａに対して非接触の状態で回転し、インペラ７の下側の側面とエンドケーシング２３の壁面２３ａとに摩耗が生じない。 When the liquid is pumped by using the motor pump 1 configured as described above, the impeller 7 is lowered by its own weight until the bearing washer 14 of the rotating portion 6 of the motor comes into contact with the first bearing 21 when the operation is stopped. The impeller 7 is prevented from moving below a predetermined position by the regulating member 24. Therefore, a predetermined value of clearance is always secured between the impeller 7 and the wall surface 23a of the end casing 23. Therefore, at the start of operation, the impeller 7 rotates in a non-contact state with respect to the wall surface 23a of the end casing 23, and the lower side surface of the impeller 7 and the wall surface 23a of the end casing 23 do not wear.
　なお、ポンプシャフト４を水平方向に向けてモータポンプ１を用いて液体を圧送する場合は、運転停止時には、モータ２の回転部６に含まれるマグネットと、固定子９に含まれるコイル、ヨーク等との位置関係によって、モータの回転部６の軸受ワッシャ１４が第１軸受２１に当接するまで、インペラ７が軸方向一方に移動する。しかし、この場合においても、モータポンプ１によれば、インペラ７は、規制部材２４によって所定位置より軸方向一方へ移動しない。このため、ポンプシャフト４を水平方向に向けてモータポンプ１を使用する場合も、インペラ７とエンドケーシング２３の壁面２３ａとの間に所定値のクリアランスが必ず確保される。故に、運転開始時には、インペラ７はエンドケーシング２３の壁面２３ａに対して非接触の状態で回転し、インペラ７の側面とエンドケーシング２３の壁面２３ａとに摩耗が生じない。 When the pump shaft 4 is directed in the horizontal direction and the liquid is pumped by the motor pump 1, the magnet included in the rotating portion 6 of the motor 2 and the coil, yoke, etc. included in the stator 9 are used when the operation is stopped. The impeller 7 moves in one axial direction until the bearing washer 14 of the rotating portion 6 of the motor comes into contact with the first bearing 21 due to the positional relationship with the first bearing 21. However, even in this case as well, according to the motor pump 1, the impeller 7 does not move in one axial direction from the predetermined position due to the regulating member 24. Therefore, even when the motor pump 1 is used with the pump shaft 4 oriented in the horizontal direction, a predetermined value of clearance is always secured between the impeller 7 and the wall surface 23a of the end casing 23. Therefore, at the start of operation, the impeller 7 rotates in a non-contact state with respect to the wall surface 23a of the end casing 23, and the side surface of the impeller 7 and the wall surface 23a of the end casing 23 do not wear.
　また、インペラ７が回転し始めた後、ある程度の回転速度に達するまでの間、インペラ７は上下方向に不規則に移動し（ポンプシャフト４を水平方向に向けてモータポンプ１を使用する場合もインペラ７は軸方向に不規則に移動する。）、中間ケーシング１９の壁面１９ａに接近する場合がある。しかし、中間ケーシング１９の壁面１９ａに突起３５が形成されていることから、インペラ７が壁面１９ａに接近しても、インペラ７が突起３５に当接する。したがって、インペラ７が、それ以上上昇して、壁面１９ａに接触することはない。このため、中間ケーシング１９の壁面１９ａがインペラ７と接触して摩耗することもない。また、突起３５は軸方向から視た面積が小さいため、インペラ７のディスク部７Ｂに当接しても、インペラ７のディスク部７Ｂは摩耗し難くなっている。仮にインペラ７のディスク部７Ｂが摩耗しても摩耗箇所は極一部に限定されるため、ポンプの性能に影響することは殆ど無い。 Further, after the impeller 7 starts to rotate, the impeller 7 moves irregularly in the vertical direction until a certain rotation speed is reached (in the case where the motor pump 1 is used with the pump shaft 4 oriented in the horizontal direction). The impeller 7 moves irregularly in the axial direction) and may approach the wall surface 19a of the intermediate casing 19. However, since the protrusion 35 is formed on the wall surface 19a of the intermediate casing 19, the impeller 7 abuts on the protrusion 35 even if the impeller 7 approaches the wall surface 19a. Therefore, the impeller 7 does not rise any further and come into contact with the wall surface 19a. Therefore, the wall surface 19a of the intermediate casing 19 does not come into contact with the impeller 7 and wear. Further, since the protrusion 35 has a small area seen from the axial direction, the disc portion 7B of the impeller 7 is less likely to be worn even if it comes into contact with the disc portion 7B of the impeller 7. Even if the disc portion 7B of the impeller 7 is worn, the worn portion is limited to a very small part, so that the performance of the pump is hardly affected.
　また、本実施形態に係るモータポンプ１では、第１部３０Ａ内のインペラ７より上側（第１軸受２１側）に位置する液体の圧力と、第１部３０Ａ内のインペラ７より下側（規制部材２４側）に位置する液体の圧力との差圧によってインペラ７のボス部７Ａが後述する規制部材２４に接するように、インペラ７より下側（規制部材２４側）に位置する第１部３０Ａの内径Ｄ１がインペラ７より上側（第１軸２１受側）に位置する第１部３０Ａの内径Ｄ２より大きく設定されている。このことはインペラ７の側面とエンドケーシング２３の壁面２３ａとの摩耗防止に寄与している。 Further, in the motor pump 1 according to the present embodiment, the pressure of the liquid located above the impeller 7 in the first part 30A (on the side of the first bearing 21) and the pressure below the impeller 7 in the first part 30A (regulation). The first part 30A located on the lower side (regulatory member 24 side) of the impeller 7 so that the boss portion 7A of the impeller 7 comes into contact with the regulating member 24 described later due to the differential pressure from the pressure of the liquid located on the member 24 side). The inner diameter D1 of the first portion 30A is set to be larger than the inner diameter D2 of the first portion 30A located above the impeller 7 (the receiving side of the first shaft 21). This contributes to the prevention of wear between the side surface of the impeller 7 and the wall surface 23a of the end casing 23.
　また、本実施形態に係るモータポンプ１では、通常運転時には、ポンプシャフト４の上端部に掛かる液体の圧力が、ポンプシャフト４の下端部に掛かる液体の圧力より大きくなる流路が形成されている。更にそれらの圧力の差を大きくして、インペラ７のボス部７Ａが規制部材２４に更に接し易くなるように、ポンプシャフト４内に形成された貫通穴４ｂの内径が上方から下方に向かって縮径（モータ２側の端部からポンプ３側の端部に向かって縮径）したものとなっている。 Further, in the motor pump 1 according to the present embodiment, a flow path is formed in which the pressure of the liquid applied to the upper end portion of the pump shaft 4 becomes larger than the pressure of the liquid applied to the lower end portion of the pump shaft 4 during normal operation. .. Further, the inner diameter of the through hole 4b formed in the pump shaft 4 is reduced from the upper side to the lower side so that the boss portion 7A of the impeller 7 is more easily in contact with the regulation member 24 by increasing the difference in pressure between them. The diameter is reduced (reduced from the end on the motor 2 side toward the end on the pump 3 side).
　また、モータポンプ１の設置時には、バックケーシング１２内の上部のエアが抜けていない状態で運転を開始するため、当該エアがポンプシャフト４の貫通穴４ｂを通って急激に下方に抜けてしまい、バックケーシング１２内の上部の圧力が急激に負圧化して、ポンプシャフト４とともに、インペラ７が上方に急な挙動を起こし、突起３５がインペラ７を受ける負荷が大きくなってしまうという問題がある。しかし、本実施形態では、ポンプシャフト４に設けられた貫通穴４ｂが、既述した第１縮径部４ｃおよび第２縮径部４ｄを有するものであるので、バックケーシング１２内の上部のエアが貫通穴４ｂを通って抜ける流量が抑制され、急激な負圧の発生を防止することができる。その結果、インペラ７が上方に急な挙動を起こし、突起３５がインペラ７を受ける負荷が大きくなることもない。 Further, when the motor pump 1 is installed, the operation is started in a state where the air in the upper part in the back casing 12 is not evacuated, so that the air suddenly escapes downward through the through hole 4b of the pump shaft 4. There is a problem that the pressure at the upper part in the back casing 12 suddenly becomes negative, the impeller 7 suddenly behaves upward together with the pump shaft 4, and the load on the protrusion 35 receiving the impeller 7 becomes large. However, in the present embodiment, since the through hole 4b provided in the pump shaft 4 has the first reduced diameter portion 4c and the second reduced diameter portion 4d described above, the air in the upper part in the back casing 12 The flow rate through which the casing 4b passes through the through hole 4b is suppressed, and the generation of a sudden negative pressure can be prevented. As a result, the impeller 7 suddenly behaves upward, and the load on the protrusion 35 receiving the impeller 7 does not increase.
　なお、ポンプシャフト４を水平方向に向けてモータポンプ１を使用する場合も同様に、モータポンプ１の設置時には、バックケーシング１２内の奥部のエアが抜けていない状態で運転を開始するため、当該エアがポンプシャフト４の貫通穴４ｂを通って急激に軸方向一方（ポンプ３の方向）に抜けてしまい、バックケーシング１２内の奥部の圧力が急激に負圧化して、ポンプシャフト４とともに、インペラ７が軸方向他方に急な挙動を起こし、突起３５がインペラ７を受ける負荷が大きくなってしまうという問題がある。しかし、この場合も、ポンプシャフト４に設けられた貫通穴４ｂが、既述した第１縮径部４ｃおよび第２縮径部４ｄを有するものであるので、バックケーシング１２内の奥部のエアが貫通穴４ｂを通って抜ける流量が抑制され、急激な負圧の発生を防止することができる。その結果、インペラ７が軸方向他方に急な挙動を起こし、突起３５がインペラ７を受ける負荷が大きくなることもない。 Similarly, when the motor pump 1 is used with the pump shaft 4 oriented in the horizontal direction, the operation is started in a state where the air in the inner part of the back casing 12 is not released when the motor pump 1 is installed. The air suddenly escapes in one axial direction (in the direction of the pump 3) through the through hole 4b of the pump shaft 4, and the pressure in the inner part of the back casing 12 suddenly becomes negative, and together with the pump shaft 4. There is a problem that the impeller 7 suddenly behaves in the other direction in the axial direction, and the load on the protrusion 35 receiving the impeller 7 becomes large. However, also in this case as well, since the through hole 4b provided in the pump shaft 4 has the first reduced diameter portion 4c and the second reduced diameter portion 4d described above, the air in the inner part of the back casing 12 is provided. The flow rate through which the casing 4b passes through the through hole 4b is suppressed, and the generation of a sudden negative pressure can be prevented. As a result, the impeller 7 suddenly behaves in the other direction in the axial direction, and the load on the protrusion 35 receiving the impeller 7 does not increase.
　以上に説明した本発明は、その精神や主旨または主要な特徴から逸脱することなく、他のいろいろな形で実施することができる。そのため、上述の実施形態はあらゆる点で単なる例示にすぎず、限定的に解釈してはならない。すなわち上記の実施形態は例にすぎない。 The present invention described above can be carried out in various other forms without departing from its spirit, purpose or main characteristics. Therefore, the above embodiments are merely exemplary in all respects and should not be construed in a limited way. That is, the above embodiment is merely an example.
　本発明は、例えば、キャンド方式のモータポンプに適用することができる。 The present invention can be applied to, for example, a canned motor pump.
　１　　モータポンプ
　２　　モータ
　３　　ポンプ
　４　　ポンプシャフト
　６　　モータの回転部
　７　　インペラ（カスケードインペラ）
　１９　中間ケーシング
　１９ａ　中間ケーシングの壁面
　２０　ポンプケーシング
　２１　第１軸受
　２２　第２軸受
　２３　エンドケーシング（ポンプケーシング本体）
　２３ａ　エンドケーシングの壁面（ポンプケーシング本体の壁面）
　２４　規制部材
　２６　スペーサ
　３０　ポンプ室
　３０Ａ　ポンプ室の第１部
　３０Ｂ　ポンプ室の第２部
　３５　突起 1 Motor pump 2 Motor 3 Pump 4 Pump shaft 6 Motor rotating part 7 Impeller (cascade impeller)
19 Intermediate casing 19a Wall surface of intermediate casing 20 Pump casing 21 First bearing 22 Second bearing 23 End casing (pump casing body)
23a End casing wall surface (pump casing body wall surface)
24 Regulatory member 26 Spacer 30 Pump chamber 30A Pump chamber first part 30B Pump chamber second part 35 Protrusions

Claims (6)

  1. 　ポンプシャフトに固定されたモータの回転部と、
    　前記モータの回転部の両側で前記ポンプシャフトを回転自在に支持する第１軸受および第２軸受と、
    　前記ポンプシャフトに対して一体で回転すると同時に、軸方向へ移動可能に設けられたカスケードインペラ（以下「インペラ」という。）と、
    　前記第１軸受の半径方向外側で、前記モータと前記インペラとの間に形成された中間ケーシングと、
    　前記インペラを収容するポンプケーシングを前記中間ケーシングとともに構成するポンプケーシング本体と、
    　を備え、
    　前記ポンプシャフトが軸方向に遊びを有するように前記第１軸受および前記第２軸受に支持された、モータポンプにおいて、
    　前記モータの回転部が前記第１軸受に接触した状態で、前記インペラの側面と前記ポンプケーシング本体の壁面との間に所定値のクリアランスが確保されるよう、前記インペラの前記ポンプケーシング本体側への移動を規制する規制部材が前記ポンプシャフトに対して固定され、
    　前記中間ケーシングの壁面に前記インペラの側面に向かって突出した突起が形成され、
    　前記インペラが前記ポンプケーシング本体の壁面と前記中間ケーシングの壁面との間の中間位置にあるとき、前記突起が前記インペラの中間ケーシング側の側面に接しないように、前記突起の前記中間ケーシングの壁面からの突出寸法が設定されている、
    　ことを特徴とするモータポンプ。     The rotating part of the motor fixed to the pump shaft,
    A first bearing and a second bearing that rotatably support the pump shaft on both sides of the rotating portion of the motor,
    A cascade impeller (hereinafter referred to as "impeller") provided so as to be rotatable in the axial direction at the same time as rotating integrally with the pump shaft.
    An intermediate casing formed between the motor and the impeller on the radial outer side of the first bearing,
    A pump casing main body that constitutes the pump casing accommodating the impeller together with the intermediate casing,
    Equipped with
    In a motor pump supported by the first bearing and the second bearing so that the pump shaft has play in the axial direction.
    In a state where the rotating portion of the motor is in contact with the first bearing, the impeller is moved to the pump casing main body side of the impeller so that a predetermined value of clearance is secured between the side surface of the impeller and the wall surface of the pump casing main body. A regulatory member that regulates the movement of the pump shaft is fixed to the pump shaft.
    A protrusion protruding toward the side surface of the impeller is formed on the wall surface of the intermediate casing.
    When the impeller is at an intermediate position between the wall surface of the pump casing main body and the wall surface of the intermediate casing, the wall surface of the intermediate casing of the protrusion is prevented from contacting the side surface of the impeller on the intermediate casing side. The protrusion dimension from is set,
    A motor pump characterized by that.
  2. 　請求項１に記載のモータポンプにおいて、
    　前記所定値は、０．０３ｍｍ～０．０７ｍｍであり、
    　前記ポンプケーシング本体の壁面から前記中間ケーシングの壁面までの寸法と、前記インペラの厚さ寸法との差が０．１３ｍｍ～０．１７ｍｍである、ことを特徴とするモータポンプ。     In the motor pump according to claim 1,
    The predetermined value is 0.03 mm to 0.07 mm, and is
    A motor pump characterized in that the difference between the dimension from the wall surface of the pump casing main body to the wall surface of the intermediate casing and the thickness dimension of the impeller is 0.13 mm to 0.17 mm.
  3. 　請求項２に記載のモータポンプにおいて、
    　前記突起の前記中間ケーシングの壁面からの突出寸法は、０．０１ｍｍ～０．０３ｍｍである、ことを特徴とするモータポンプ。     In the motor pump according to claim 2,
    A motor pump characterized in that the protrusion dimension of the protrusion from the wall surface of the intermediate casing is 0.01 mm to 0.03 mm.
  4. 　請求項１～３の何れか１項に記載のモータポンプにおいて、
    　前記ポンプシャフトに外嵌固定されたスペーサを更に備え、
    　前記スペーサに対して前記インペラが一体で回転すると同時に軸方向へ移動可能に嵌め付けられ、
    　前記規制部材は、前記インペラの前記中間ケーシングと反対側において前記スペーサに固定されている、ことを特徴とするモータポンプ。     In the motor pump according to any one of claims 1 to 3, the motor pump
    Further provided with a spacer externally fitted and fixed to the pump shaft,
    The impeller rotates integrally with the spacer and is fitted so as to be movable in the axial direction at the same time.
    The motor pump is characterized in that the regulating member is fixed to the spacer on the side opposite to the intermediate casing of the impeller.
  5. 　請求項１～４の何れか１項に記載のモータポンプにおいて、
    　前記ポンプケーシング内に形成されたポンプ室は、
    　前記ポンプシャフトを収容した略円柱状の空間からなる第１部と、
    　前記中間ケーシングの壁面と前記ポンプケーシング本体の壁面との間に形成される第２部と、
    　を有し、
    　前記第１部における前記インペラより前記第１軸受側に位置する液体の圧力が、前記第１部における前記インペラより前記規制部材側に位置する液体の圧力よりも高くなるように、液体の流路がモータポンプ内に形成されており、
    　前記２つの圧力の差によって前記インペラが前記規制部材に接するように、前記インペラより前記規制部材側に位置する前記第１部の内径が前記インペラより前記第１軸受側に位置する前記第１部の内径より大きく設定されている、ことを特徴するモータポンプ。     In the motor pump according to any one of claims 1 to 4, the motor pump
    The pump chamber formed in the pump casing is
    The first part, which consists of a substantially columnar space accommodating the pump shaft,
    The second part formed between the wall surface of the intermediate casing and the wall surface of the pump casing main body,
    Have,
    The flow path of the liquid so that the pressure of the liquid located on the first bearing side of the impeller in the first part is higher than the pressure of the liquid located on the regulating member side of the impeller in the first part. Is formed in the motor pump,
    The first part whose inner diameter of the first part located on the regulating member side of the impeller is located on the first bearing side of the impeller so that the impeller comes into contact with the regulating member due to the difference between the two pressures. A motor pump characterized by being set larger than the inner diameter of the.
  6. 　請求項１～５の何れか１項に記載のモータポンプにおいて、
    　前記ポンプシャフトには、その軸線に沿って貫通穴が形成されており、
    　前記貫通穴は、前記モータ側の端部から前記ポンプ側の端部に向かって縮径した縮径部を有する、ことを特徴とするモータポンプ。     The motor pump according to any one of claims 1 to 5.
    The pump shaft has a through hole formed along its axis.
    The motor pump is characterized in that the through hole has a reduced diameter portion whose diameter is reduced from the end portion on the motor side toward the end portion on the pump side.
PCT/JP2021/017313 2020-05-26 2021-05-04 Motor pump WO2021241146A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315448A1 (en) * 1992-05-19 1993-12-23 Lederle Pumpen & Maschf Peripheral wheel or turbine pump - has flow feed path using centrifugal impeller components and guide elements.
JP2009299628A (en) * 2008-06-16 2009-12-24 Kps Kogyo Kk Pump and pump unit provided with the same
JP2016037952A (en) * 2014-08-11 2016-03-22 株式会社川本製作所 Pump device and method of manufacturing the same
JP2016160760A (en) * 2015-02-26 2016-09-05 株式会社豊田自動織機 Centrifugal compressor
JP2019210869A (en) * 2018-06-05 2019-12-12 株式会社荏原製作所 Pump device, impeller interval adjusting method for pump device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315448A1 (en) * 1992-05-19 1993-12-23 Lederle Pumpen & Maschf Peripheral wheel or turbine pump - has flow feed path using centrifugal impeller components and guide elements.
JP2009299628A (en) * 2008-06-16 2009-12-24 Kps Kogyo Kk Pump and pump unit provided with the same
JP2016037952A (en) * 2014-08-11 2016-03-22 株式会社川本製作所 Pump device and method of manufacturing the same
JP2016160760A (en) * 2015-02-26 2016-09-05 株式会社豊田自動織機 Centrifugal compressor
JP2019210869A (en) * 2018-06-05 2019-12-12 株式会社荏原製作所 Pump device, impeller interval adjusting method for pump device

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