Intermediate casing holder and motor pump

Abstract

An intermediate casing holder is provided that enables the motor pump to be made more compact. [Solution] The intermediate casing holder restricts the axial movement of the intermediate casing.

Description

Technical Field

[0001] The present invention relates to an intermediate casing holder and a motor pump.

Background Art

[0002] In a pump device including a motor and a pump, there is an increasing demand for compactification. As a pump device having a compact structure, a motor pump in which a pump and a motor are integrally formed is provided (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] A motor pump may include an intermediate casing that surrounds an impeller depending on its configuration. In this case, in order to prevent the intermediate casing from detaching, the motor pump is assembled by inserting through bolts into the suction casing and the discharge casing with the intermediate casing sandwiched between the suction casing and the discharge casing.

[0005] However, in order to achieve further compactification of the motor pump, it is necessary to construct a motor pump having a new structure.

[0006] Therefore, an object of the present invention is to provide an intermediate casing holder capable of achieving compactification of a motor pump and a motor pump including the intermediate casing holder. [Means for solving the problem]

[0007] In one embodiment, an intermediate casing holder is provided that can be attached to an intermediate casing positioned between a suction casing and a discharge casing, which house a rotating shaft and an impeller. The intermediate casing holder restricts the movement of the intermediate casing in the axial direction of the rotating shaft.

[0008] In one embodiment, the intermediate casing holder is made of an elastic member that is elastically deformable in the axial direction, and when the intermediate casing holder is attached to the intermediate casing, a restoring force based on elastic deformation is applied to the intermediate casing, pressing the intermediate casing against the discharge casing. In one embodiment, the intermediate casing holder is composed of a coil spring extending in the axial direction. In one embodiment, the intermediate casing holder has a front-end hooking portion that can be hooked onto the intermediate casing, and a rear-end hooking portion that can be hooked onto the motor casing attached to the discharge casing.

[0009] In one embodiment, the intermediate casing holder has a cylindrical shape that covers the intermediate casing. In one embodiment, the intermediate casing holder has a plate shape that extends in the axial direction.

[0010] In one embodiment, a motor pump is provided. The motor pump comprises a rotating shaft, an impeller fixed to the rotating shaft, a motor for rotating the impeller, an intermediate casing disposed between a suction casing and a discharge casing housing the rotating shaft and the impeller, and an intermediate casing holder mounted on the intermediate casing, wherein the intermediate casing holder restricts the movement of the intermediate casing in the axial direction of the rotating shaft.

[0011] In one embodiment, the intermediate casing holder is made of an elastic member that is elastically deformable in the axial direction, and when the intermediate casing holder is attached to the intermediate casing, a restoring force based on elastic deformation is applied to the intermediate casing, pressing the intermediate casing against the discharge casing. In one embodiment, the intermediate casing holder is composed of a coil spring extending in the axial direction. In one embodiment, the motor pump comprises a plurality of intermediate casings including the intermediate casing, and a sealing member installed between adjacent intermediate casings among the plurality of intermediate casings.

[0012] In one embodiment, each of the plurality of intermediate casings has an annular seal step portion to which the sealing member is mounted, and a cylindrical portion connected to the annular seal step portion and extending in the axial direction, wherein the sealing member is positioned between the cylindrical portion formed in one of the adjacent intermediate casings and the annular seal step portion formed in the other intermediate casing. In one embodiment, the plurality of intermediate casings are arranged in an overlapping manner from the suction casing side to the discharge casing side, and the intermediate casing holder is attached to the intermediate casing that is located closest to the suction casing among the plurality of intermediate casings. In one embodiment, the motor pump comprises a motor casing mounted on the discharge casing, the motor casing having an annular end face to which the intermediate casing holder is mounted, and the intermediate casing holder is mounted on the annular end face, forming a gap between the intermediate casing holder and the discharge casing.

[0013] In one embodiment, the intermediate casing holder has a deformed portion formed in the portion that is mounted in the annular holder groove by machining the intermediate casing holder, and the motor casing accommodates the deformed portion and has a receiving recess formed in the annular end face. In one embodiment, the intermediate casing holder has a front-end hook portion that is hooked onto the intermediate casing, and a rear-end hook portion that is hooked onto the motor casing attached to the discharge casing. In one embodiment, the motor pump includes a partition plate fixed to a return vane that guides the liquid discharged from the impeller, and a sliding bearing mounted on the partition plate and supporting the rotating shaft.

[0014] In one embodiment, the intermediate casing holder has a cylindrical shape that covers the intermediate casing. In one embodiment, the motor pump comprises a plurality of intermediate casing holders, including the intermediate casing holder, each of which has a plate shape extending in the axial direction, and the plurality of intermediate casing holders are arranged along the circumferential direction of the intermediate casing. In one embodiment, the motor pump comprises a plurality of intermediate casing holders, including the intermediate casing holder, each of which is composed of a coil spring extending in the axial direction, and the plurality of intermediate casing holders are arranged along the circumferential direction of the intermediate casing. [Effects of the Invention]

[0015] The intermediate casing holder is configured to restrict the movement of the intermediate casing in the axial direction of the rotation axis. This configuration allows for the assembly of the motor pump without the need for through bolts, thus enabling a more compact motor pump. [Brief explanation of the drawing]

[0016] [Figure 1] This figure shows one embodiment of a motor pump. [Figure 2] Figure 1 is an enlarged view of the motor pump shown. [Figure 3] Figure 1 is an enlarged view of the motor pump shown. [Figure 4]It is a longitudinal sectional view of an intermediate casing holder. [Figure 5] It is a view when the intermediate casing holder shown in FIG. 4 is seen from the axial direction. [Figure 6] It is a view showing an intermediate casing holder attached to a stator can. [Figure 7] It is a view showing another embodiment of the intermediate casing holder. [Figure 8] It is a view showing a housing recess formed in an annular holder groove. [Figure 9] It is a view showing another embodiment of the motor pump. [Figure 10] FIGS. 10(a) and 10(b) are views showing another embodiment of the intermediate casing holder. [Figure 11] FIGS. 11(a) and 11(b) are views showing another embodiment of the intermediate casing holder.

Embodiments for Carrying out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding components are denoted by the same reference numerals, and redundant descriptions are omitted. In the plurality of embodiments described below, the configurations of one embodiment that are not particularly described are the same as those of other embodiments, so the redundant descriptions thereof are omitted.

[0018] FIG. 1 is a view showing an embodiment of a motor pump. In the embodiment shown in FIG. 1, the motor pump MP is a rotating machine (more specifically, a canned motor pump) provided with a permanent magnet type motor.

[0019] The motor pump MP includes a rotating shaft 2, a plurality of impellers 1A, 1B fixed to the rotating shaft 2, and a motor 20 that rotates the impellers 1A, 1B and the rotating shaft 2. Hereinafter, in this specification, the impellers 1A, 1B may be referred to as the impeller 1 without particularly distinguishing them. [[ID=…]] [[ID=…]]

[0020] [[ID=…]] The motor pump MP comprises a motor pump casing MPC that houses an impeller 1, a rotating shaft 2, and a motor 20. The motor pump casing MPC includes a suction casing SC and a discharge casing DC located on either side of the impeller 1, and a motor casing MC located between the suction casing SC and the discharge casing DC.

[0021] The suction casing SC has a suction port SP formed in its central portion. Similarly, the discharge casing DC has a discharge port DP formed in its central portion. The suction port SP and the discharge port DP are aligned in a straight line along the axis AX of the rotating shaft 2. The liquid (handled fluid) drawn into the motor pump casing MPC through the suction port SP passes through impellers 1A and 1B in that order and is transferred to the outside through the discharge port DP.

[0022] As shown in Figure 1, the impeller 1A has an annular projection 3 extending in the direction of the axis AX. The motor 20 has a rotor 21 fixed to the annular projection 3 of the impeller 1A, and a stator 22 positioned radially outward from the rotor 21. The stator 22 has a stator core 22a and a plurality of coils 22b wound around the stator core 22a.

[0023] When power is supplied to the stator 22, the stator 22 generates a rotating magnetic field, and the rotor 21 rotates the rotation shaft 2 together with the impeller 1A due to the action of the rotating magnetic field from the stator 22. The impeller 1B rotates together with the rotation shaft 2.

[0024] The motor casing MC comprises a rotor can 25 that covers the rotor 21, a stator can 26 positioned radially outside the rotor can 25, a motor frame 31 positioned radially outside the stator can 26, and a motor cover 30 on which the stator can 26 and motor frame 31 are mounted.

[0025] The rotor can 25 has a cylindrical shape and is mounted in a liquid-tight manner on the annular projection 3. The stator can 26 is positioned to surround the rotor can 25, forming a gap. The motor frame 31 is positioned to surround the stator can 26, forming a gap (i.e., space MS). The rotor can 25, stator can 26, and motor frame 31 are positioned concentrically with the rotation axis 2.

[0026] The stator can 26 and motor frame 31 form a cylindrical space MS arranged along the axis AX. The stator 22 is located in the space MS. The motor cover 30 closes one side of the space MS, and the suction casing SC closes the other side of the space MS.

[0027] The space MS is sealed by the suction casing SC, motor cover 30, stator can 26, and motor frame 31. In this embodiment, the space MS is filled with filler F. In one embodiment, the motor pump MP may have a space MS that is not filled with filler F.

[0028] The motor pump MP is equipped with a bearing 40 that rotatably supports the impeller 1. The bearing 40 is located outside the flow path of the liquid transferred by the impeller 1. The bearing 40 comprises a stationary bearing body 41 integrally formed with the suction casing SC and a rotating bearing body 42 mounted on the annular projection 3 of the impeller 1A.

[0029] The rotating bearing body 42 is a rotating member that rotates together with the impeller 1, while the stationary bearing body 41 is a stationary member that does not rotate together with the impeller 1. Although not shown in the figures, the stationary bearing body 41 (and / or the rotating bearing body 42) has multiple grooves for generating dynamic pressure from the liquid that flows into the gap between the stationary bearing body 41 and the rotating bearing body 42. The bearing 40 supports the load of the impeller 1 non-contact by the dynamic pressure of the liquid.

[0030] The motor pump MP comprises a plurality of return vanes 5 positioned on the rear side of each of the impellers 1A and 1B, and a plurality of partition plates 4A and 4B fixed to the plurality of return vanes 5. Hereinafter in this specification, partition plates 4A and 4B may be referred to as partition plate 4 without any particular distinction.

[0031] The number of partition plates 4 corresponds to the number of impellers 1. Multiple return vanes 5 are fixed to each partition plate 4 and are configured to smoothly guide the liquid discharged from one impeller 1 to the next impeller 1. The return vanes 5 contribute to the conversion of the liquid discharged from the impeller 1 from kinetic energy to pressure energy.

[0032] The motor pump MP is equipped with an annular sliding bearing 6 that supports the rotating shaft 2. The sliding bearing 6 is mounted on a partition plate 4B and is configured to support the radial load acting on the rotating shaft 2.

[0033] Figures 2 and 3 are enlarged views of the motor pump shown in Figure 1. The motor pump MP comprises a plurality of intermediate casings 50A, 50B positioned between the suction casing SC and the discharge casing DC. These plurality of intermediate casings 50A, 50B have the same structure. Hereinafter, in this specification, the intermediate casings 50A, 50B may be referred to as intermediate casing 50 without any particular distinction.

[0034] The number of intermediate casings 50 corresponds to the number of impellers 1. Multiple intermediate casings 50A and 50B are arranged in a straight line along the axial direction AX from the suction casing SC to the discharge casing DC, overlapping each other.

[0035] In this embodiment, the intermediate casing 50A is located on the suction casing SC side, and the intermediate casing 50B is located on the discharge casing DC side. In particular, the intermediate casing 50B is attached to the discharge casing DC.

[0036] The intermediate casing 50A is fitted into the intermediate casing 50B. In this way, the intermediate casings 50A and 50B are arranged overlapping and supported by the discharge casing DC.

[0037] The motor pump MP includes a sealing member (e.g., an O-ring) C3 positioned between adjacent intermediate casings 50 (see Figures 2 and 3). In this embodiment, the sealing member C3 is positioned between intermediate casing 50A and intermediate casing 50B.

[0038] The intermediate casing 50 has a cylindrical shape that extends axially AX overall and has an L-shaped bent cross-section. More specifically, as shown in Figure 3, the intermediate casing 50 has an annular seal step portion 50a to which the seal member C3 is attached, a cylindrical portion 50b connected to the annular seal step portion 50a and extending axially AX, and a bent portion 50c located on the opposite side of the cylindrical portion 50b with respect to the annular seal step portion 50a.

[0039] The sealing member C3 is positioned between a cylindrical portion 50b formed in one of the adjacent intermediate casings 50 (intermediate casing 50A in Figure 3) and an annular sealing step portion 50a formed in the other intermediate casing 50 (intermediate casing 50B in Figure 3).

[0040] By arranging the sealing member C3, leakage of liquid from adjacent intermediate casings 50 and ingress of liquid into adjacent intermediate casings 50 can be prevented. In one embodiment, the motor pump MP does not necessarily need to be equipped with the sealing member C3. Depending on its detailed structure, the motor pump MP may omit the sealing member C3.

[0041] The bent portion 50c extends perpendicular to the axis AX direction. In other words, the bent portion 50c extends parallel to the impeller 1. Multiple return vanes 5 are connected to the bent portion 50c of each intermediate casing 50. Partition plates 4 fixed to the multiple return vanes 5 extend parallel to the bent portion 50c (and the impeller 1).

[0042] The following describes the flow of liquid transferred by the motor pump MP. The motor 20 rotates the impeller 1 (i.e., impellers 1A and 1B) and the rotating shaft 2. When impeller 1 rotates, the liquid is transferred through the suction port SP into the internal space of the motor pump MP.

[0043] The liquid, pressurized by the rotation of the impeller 1A, flows perpendicular to the axial direction AX (i.e., centrifugal direction). A portion of the liquid flows through the gap between the rotor can 25 and the stator can 26 and is introduced into the bearing 40. The liquid introduced into the bearing 40 generates dynamic pressure in the gap between the stationary bearing body 41 and the rotating bearing body 42. The stationary bearing body 41 supports the rotating bearing body 42 due to the dynamic pressure of the liquid.

[0044] Most of the liquid flowing in the centrifugal direction is guided to the impeller 1B by the return blades 5. The liquid, pressurized by the rotation of the impeller 1B, flows in the centrifugal direction and collides with the inner surface of the intermediate casing 50A, changing its flow direction.

[0045] The liquid, whose flow direction has been reversed, comes into contact with the sliding bearing 6 held by the partition plate 4B, cooling and lubricating the sliding bearing 6. The majority of the liquid is guided by the return vane 5 to the discharge port DP of the discharge casing DC and transferred to the outside through the discharge port DP.

[0046] In this way, the liquid drawn into the motor pump MP is pressurized by the rotation of impellers 1A and 1B, flows along the axis AX, and is transferred to the outside of the motor pump MP.

[0047] During operation of the motor pump MP, the intermediate casing 50 may be affected by the pressure of the pressurized liquid and the rotation of the impeller 1. Due to these effects, the intermediate casing 50 may detach from the discharge casing DC. Therefore, the motor pump MP is equipped with an intermediate casing holder configured to prevent the intermediate casing 50 from detaching. The configuration of the intermediate casing holder will be described below.

[0048] Figure 4 is a longitudinal cross-sectional view of the intermediate casing holder. Figure 5 is a view of the intermediate casing holder shown in Figure 4 from the axial direction. The intermediate casing holder 100 is mounted on the intermediate casing 50, and the intermediate casing holder 100 has an overall cylindrical shape according to the shape of the intermediate casing 50. The intermediate casing holder 100 is positioned on the outside of the intermediate casing 50 so as to surround the intermediate casing 50. The intermediate casing 50 and the intermediate casing holder 100 are positioned concentrically with the rotation axis 2.

[0049] The intermediate casing holder 100, mounted on the intermediate casing 50, restricts the movement of the intermediate casing 50 in the axial direction AX. The intermediate casing holder 100 has a cylindrical main body portion 101 extending parallel to the axial direction AX, a front end hook portion 103 hooked onto the intermediate casing 50, and a rear end hook portion 102 hooked onto the motor cover 30.

[0050] The front end hook portion 103 is bent radially inward from the main body portion 101, and the rear end hook portion 102 is bent radially outward from the main body portion 101. Therefore, when the intermediate casing holder 100 is placed between the intermediate casing 50 and the motor casing MC, the front end hook portion 103 is hooked onto the intermediate casing 50 (more specifically, the annular seal step portion 50a), and the rear end hook portion 102 is hooked onto the motor casing MC (in this embodiment, the motor cover 30).

[0051] In this embodiment, the tip-side hook portion 103 is hooked onto the annular seal step portion 50a of the intermediate casing 50A that is positioned closest to the suction casing SC (in other words, furthest from the discharge casing DC) among the multiple intermediate casings 50A and 50B that are arranged in an overlapping manner.

[0052] The motor cover 30 has an annular end face 35 to which the intermediate casing holder 100 is attached. The annular end face 35 constitutes the open end of the motor cover 30, and the rear end hook portion 102 is hooked onto the annular end face 35 of the motor cover 30.

[0053] When the rear end hook portion 102 is hooked onto the annular end face 35, the intermediate casing holder 100 is mounted on the annular end face 35, forming a gap GP between the rear end hook portion 102 and the discharge casing DC (see Figure 3).

[0054] More specifically, when the rear end hook portion 102 of the discharge casing DC is attached to the annular end face 35, the discharge casing DC has an annular step portion DCa facing the rear end hook portion 102. The width of the annular step portion DCa in the axial direction AX is greater than the thickness of the rear end hook portion 102. Therefore, even when the rear end hook portion 102 is hooked to the annular end face 35, the intermediate casing holder 100 is positioned to form a gap GP without the rear end hook portion 102 coming into contact with the discharge casing DC.

[0055] In this embodiment, the motor cover 30 has a circular annular end face 35, and the discharge casing DC has a circular annular stepped portion DCa. The intermediate casing holder 100 has a circular cross-section corresponding to the annular end face 35 and the annular stepped portion DCa.

[0056] In one embodiment, the motor cover 30 may have a polygonal annular end face 35, and the discharge casing DC may have a polygonal annular stepped portion DCa. In this case, the intermediate casing holder 100 may have a polygonal cross-section (e.g., square, hexagonal) corresponding to the annular end face 35 and the annular stepped portion DCa. In this case, the intermediate casing 50 and the motor cover 30 have the same cross-sectional shape as the intermediate casing holder 100.

[0057] Figure 6 shows an intermediate casing holder mounted on the stator can. In the embodiment described above, the intermediate casing holder 100 is mounted on the annular end face 35 of the motor cover 30, but as shown in Figure 6, the intermediate casing holder 100 may be mounted on the stator can 26 of the motor casing MC.

[0058] In the embodiment shown in Figure 6, the stator can 26 has an annular holder groove 36 for hooking the rear end hook portion 102. The rear end hook portion 102 is hooked into the annular holder groove 36. Even in this case, the front end hook portion 103 is hooked into the annular seal step portion 50a of the intermediate casing 50A.

[0059] In this embodiment as well, when the rear end hook portion 102 is hooked into the annular holder groove 36, the intermediate casing holder 100 forms a gap GP between the rear end hook portion 102 and the motor cover 30.

[0060] The intermediate casing holder 100 is made of an elastic member that elastically deforms in the axial direction AX. The material of the intermediate casing holder 100 is determined according to the performance of the motor pump MP. Examples of materials for the intermediate casing holder 100 include relatively soft materials such as stainless steel or resin. The intermediate casing holder 100 is, for example, a press-formed product, but may also be manufactured by a grinding machine.

[0061] Thus, the intermediate casing holder 100 is configured to be elastically deformable. Therefore, when the intermediate casing holder 100 is attached to the intermediate casing 50, the intermediate casing holder 100 applies a restoring force (i.e., a compressive force) to the intermediate casing 50 based on its elastic deformation, pressing the intermediate casing 50 against the discharge casing DC.

[0062] In this way, the intermediate casing holder 100 restricts the movement of the intermediate casing 50. Therefore, even if a force acts on the intermediate casing 50 that moves it in the axial direction AX due to the pressure of the pressurized liquid, the intermediate casing holder 100 can prevent the intermediate casing 50 from detaching from the discharge casing DC.

[0063] Furthermore, by pressing the intermediate casing 50 against the discharge casing DC, the intermediate casing holder 100 restricts the rotation of the intermediate casing 50 caused by the rotation of the impeller 1. Therefore, even if a rotational force around the axis AX acts on the intermediate casing 50, the intermediate casing holder 100 can prevent the intermediate casing 50 from detaching from the discharge casing DC.

[0064] In this way, the intermediate casing holder 100 generates a large frictional force between the intermediate casing 50 and the discharge casing DC, thereby preventing the intermediate casing 50 from moving (moving in the direction of the axis AX) and rotating (rotating around the axis AX). Therefore, the motor pump MP can prevent the intermediate casing 50 from moving and rotating without employing large fasteners such as through bolts. As a result, the motor pump MP can be made more compact.

[0065] Multiple intermediate casings 50A and 50B may overlap by press-fitting, but in this embodiment, the intermediate casing holder 100 can press the multiple intermediate casings 50A and 50B against the discharge casing DC with high frictional force due to its restoring force (compressive force). Therefore, multiple intermediate casings 50A and 50B may overlap by clearance fitting. This configuration can reduce the manufacturing cost of the motor pump MP.

[0066] Figure 7 shows another embodiment of the intermediate casing holder. As shown in Figure 7, the intermediate casing holder 100 may be composed of a coil spring extending in the axial direction AX. In this configuration as well, the intermediate casing holder 100 has a main body portion 101, a front end hook portion 103, and a rear end hook portion 102. In the embodiment shown in Figure 7, the main body portion 101 extends in a coil shape along the axial direction AX.

[0067] Figure 8 shows a receiving recess formed in the annular holder groove. During the manufacturing of the intermediate casing holder 100, a deformed portion 110 may be formed on the rear end hook portion 102 by processing the rear end hook portion 102 of the intermediate casing holder 100. This deformed portion 110 is formed, for example, by cutting or bending the material of the intermediate casing holder 100.

[0068] In this way, the intermediate casing holder 100 may have a deformed portion 110 formed on the part that is attached to the annular end face 35 (i.e., the rear end hook portion 102). In this case, when the rear end hook portion 102 is attached to the annular end face 35, the deformed portion 110 may come into contact with the annular end face 35, and as a result, the rear end hook portion 102 may not be able to make complete contact with the annular end face 35.

[0069] Therefore, as shown in Figure 8, the motor cover 30 may have a receiving recess RP for accommodating the deformed portion 110. The receiving recess RP is formed on the annular end face 35. The receiving recess RP faces the annular step portion DCa of the discharge casing DC. The receiving recess RP extends in a direction away from the annular step portion DCa of the discharge casing DC along the axial direction AX.

[0070] Therefore, when the intermediate casing holder 100 is attached to the motor cover 30, the deformed portion 110 formed on the rear end hook portion 102 is accommodated in the receiving recess RP (see Figure 8). By accommodating the deformed portion 110 in the receiving recess RP, the rear end hook portion 102 is in close contact with the annular end face 35 as a whole. Although not shown, the receiving recess RP may be formed in the annular holder groove 36 of the stator can 26 (see Figure 6).

[0071] Figure 9 shows another embodiment of the motor pump. The motor pump MP according to the above embodiment is a multi-stage pump device equipped with multiple impellers 1. As shown in Figure 9, the motor pump MP may be a single-stage pump device equipped with a single impeller 1.

[0072] The motor pump MP shown in Figure 9 has essentially the same structure as the motor pump MP described above. Therefore, a detailed explanation of the structure of the motor pump MP in the embodiment shown in Figure 9 will be omitted.

[0073] The embodiments described with reference to Figures 1 to 8 are applicable to the embodiment shown in Figure 9. For example, in this embodiment as well, the intermediate casing holder 100 may be mounted in an annular holder groove 36 formed in the stator can 26 (see Figure 6). The annular end face 35 (or annular holder groove 36) may have a receiving recess RP that accommodates a deformed portion 110 formed in the rear end hook portion 102 of the intermediate casing holder 100 (see Figure 8).

[0074] In the embodiment described above, the intermediate casing holder 100 has a cylindrical shape that covers the intermediate casing 50. However, in one embodiment, the intermediate casing holder 100 does not necessarily have to have a cylindrical shape. Other embodiments of the intermediate casing holder 100 will be described below with reference to the drawings.

[0075] Figures 10(a) and 10(b) illustrate other embodiments of the intermediate casing holder. Figure 10(a) shows a longitudinal section of a single intermediate casing holder 100. Figure 10(b) shows multiple intermediate casing holders 100 arranged along the circumferential direction of the intermediate casing 50.

[0076] As shown in Figures 10(a) and 10(b), each of the multiple intermediate casing holders 100 may have a plate shape extending in the axial direction AX. These multiple intermediate casing holders 100 have the same structure and are arranged at equal intervals along the circumferential direction of the intermediate casing 50. In one embodiment, the multiple intermediate casing holders 100 may be arranged at unequal intervals along the circumferential direction of the intermediate casing 50.

[0077] In Figure 10(b), the motor pump MP is equipped with three intermediate casing holders 100, but it is not necessarily required to have three intermediate casing holders 100. The motor pump MP may be equipped with any number of intermediate casing holders 100 required, based on the restoring force of the intermediate casing holders 100.

[0078] In this embodiment, the intermediate casing holder 100 has a plate-shaped main body portion 151 extending parallel to the axial direction AX, a front-end hook portion 153 corresponding to the front-end hook portion 103, and a rear-end hook portion 152 corresponding to the rear-end hook portion 102.

[0079] In this embodiment, each intermediate casing holder 100 (in particular, the main body portion 151) has a curved shape that follows the cylindrical portion 50b of the intermediate casing 50 (see Figure 3). In one embodiment, the intermediate casing holder 100 may extend in a straight line.

[0080] Figures 11(a) and 11(b) illustrate other embodiments of the intermediate casing holder. Figure 11(a) depicts a single intermediate casing holder composed of a coil spring. Figure 11(b) depicts multiple intermediate casing holders 100 arranged along the circumferential direction of the intermediate casing 50.

[0081] In this embodiment, each intermediate casing holder 100 is composed of a coil spring extending in the axial direction AX. In this embodiment as well, the multiple intermediate casing holders 100 are arranged at equal (or unequal) intervals along the circumferential direction of the intermediate casing 50.

[0082] In this embodiment, the intermediate casing holder 100 has a coiled main body portion 151 extending parallel to the axial direction AX, a front end hook portion 153 corresponding to the front end hook portion 103, and a rear end hook portion 152 corresponding to the rear end hook portion 102.

[0083] In this embodiment, each intermediate casing holder 100 (more specifically, the main body portion 151) has an elongated coil shape that can be accommodated in the annular gap between the intermediate casing 50 and the motor casing MC.

[0084] In this embodiment as well, the motor pump MP is equipped with three intermediate casing holders 100, but it is not necessarily required to be equipped with three intermediate casing holders 100. The motor pump MP may be equipped with any number of intermediate casing holders 100 required, based on the restoring force of the intermediate casing holders 100.

[0085] The embodiments described above are intended to enable persons with ordinary skill in the art to implement the present invention. Various modifications of the above embodiments can be made naturally by those skilled in the art, and the technical idea of ​​the present invention can be applied to other embodiments as well. Therefore, the present invention is not limited to the embodiments described, but is to be interpreted in the broadest sense according to the technical idea defined by the claims. [Explanation of symbols]

[0086] 1(1A,1B) Impeller 2 rotation axes 3. Annular projection 4 (4A, 4B) Partition Plate 5. Return feather 6. Plain bearings 20 motors 21 Rotor 22 Stator 22a Stator core 22 and Coil 25 Rotor Camber 26 Stator Can 30 Motor Cover 31 Motor Frame 35 Annular end face 36 Annular holder groove 40 bearings 41 Fixed side bearing body 42 Rotating side bearing body 50 (50A, 50B) Intermediate Casing 50a Annular seal step 50b Cylinder part 50c bend 100 Intermediate casing holder 101 Main body 102 Rear end hook 103 Hook at the tip 110 Deformed area 151 Main body 152 Rear end hook 153 Tip-side hook MP Motor Pump MPC Motor Pump Casing SC Suction Casing DC discharge casing DCa annular step MC Motor Casing SP Inlet DP outlet AX axis MS space GP gap RP housing recess F Filler C3 sealing member

Claims

1. An intermediate casing holder that can be mounted on an intermediate casing positioned between a suction casing and a discharge casing, which house a rotating shaft and an impeller, The intermediate casing holder is an intermediate casing holder that restricts the movement of the intermediate casing in the axial direction of the rotation axis.

2. The intermediate casing holder according to claim 1, wherein the intermediate casing holder is made of an elastic member that is elastically deformable in the axial direction, and when the intermediate casing holder is attached to the intermediate casing, a restoring force based on elastic deformation is applied to the intermediate casing, pressing the intermediate casing against the discharge casing.

3. The intermediate casing holder according to claim 1, wherein the intermediate casing holder is composed of a coil spring extending in the axial direction.

4. The aforementioned intermediate casing holder is The aforementioned intermediate casing has a front-end hooking portion that can be hooked onto it, The intermediate casing holder according to claim 1, further comprising a rear end hook portion that can be hooked onto a motor casing mounted on the discharge casing.

5. The intermediate casing holder according to claim 1, wherein the intermediate casing holder has a cylindrical shape that covers the intermediate casing.

6. The intermediate casing holder according to claim 1, wherein the intermediate casing holder has a plate shape extending in the axial direction.

7. It is a motor pump, The axis of rotation and An impeller fixed to the aforementioned rotating shaft, A motor that rotates the impeller, An intermediate casing is disposed between the suction casing and the discharge casing, which house the rotating shaft and the impeller. The intermediate casing is fitted with an intermediate casing holder, The intermediate casing holder restricts the movement of the intermediate casing in the axial direction of the rotation shaft of the motor pump.

8. The motor pump according to claim 7, wherein the intermediate casing holder is made of an elastic member that is elastically deformable in the axial direction, and when the intermediate casing holder is attached to the intermediate casing, a restoring force based on elastic deformation is applied to the intermediate casing, pressing the intermediate casing against the discharge casing.

9. The motor pump according to claim 7, wherein the intermediate casing holder is composed of a coil spring extending in the axial direction.

10. The aforementioned motor pump is A plurality of intermediate casings including the aforementioned intermediate casing, The motor pump according to claim 7, further comprising a sealing member installed between adjacent intermediate casings among the plurality of intermediate casings.

11. Each of the aforementioned intermediate casings is The annular seal step portion on which the sealing member is attached, It has a cylindrical portion connected to the annular seal step and extending in the axial direction, The motor pump according to claim 10, wherein the sealing member is disposed between the cylindrical portion formed in one of the adjacent intermediate casings and the annular sealing step portion formed in the other intermediate casing.

12. The aforementioned multiple intermediate casings are arranged in an overlapping manner from the suction casing side to the discharge casing side. The motor pump according to claim 10, wherein the intermediate casing holder is mounted on the intermediate casing among the plurality of intermediate casings that is positioned closest to the suction casing.

13. The motor pump comprises a motor casing mounted on the discharge casing, The motor casing has an annular end face to which the intermediate casing holder is attached, The motor pump according to claim 7, wherein the intermediate casing holder is mounted on the annular end face, forming a gap between the intermediate casing holder and the discharge casing.

14. The intermediate casing holder has a deformed portion formed in the portion that is fitted into the annular holder groove by processing the intermediate casing holder, The motor pump according to claim 13, wherein the motor casing accommodates the deformed portion and has a receiving recess formed on the annular end face.

15. The aforementioned intermediate casing holder is The tip-side hook portion that is hooked onto the intermediate casing, The motor pump according to claim 7, further comprising a rear end hook portion that is hooked onto a motor casing attached to the discharge casing.

16. The aforementioned motor pump is A partition plate fixed to a return vane that guides the liquid discharged from the impeller, The motor pump according to claim 7, further comprising a sliding bearing mounted on the partition plate and supporting the rotating shaft.

17. The motor pump according to claim 7, wherein the intermediate casing holder has a cylindrical shape that covers the intermediate casing.

18. The motor pump comprises a plurality of intermediate casing holders, including the intermediate casing holder. Each of the aforementioned intermediate casing holders has a plate shape extending in the axial direction, The motor pump according to claim 7, wherein the plurality of intermediate casing holders are arranged along the circumferential direction of the intermediate casing.

19. The motor pump comprises a plurality of intermediate casing holders, including the intermediate casing holder. Each of the aforementioned intermediate casing holders is composed of a coil spring extending in the axial direction, The motor pump according to claim 7, wherein the plurality of intermediate casing holders are arranged along the circumferential direction of the intermediate casing.

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