pump

Abstract

To disclose one example of a pump that allows a shaft cover to be easily provided on a pump not having a shaft cover.SOLUTION: A pump comprises a shaft cover 23 which is telescopic in an axial direction. Since the shaft cover 23 is telescopic in the axial direction, even a pump of a type with a different dimension between a casing 22 and a motor part 10 can absorb the difference in dimension through telescopic motion of the shaft cover 23. Also, a manufacturer of the pump 1 can manufacture the shaft cover 23 as a separate component independent from the casing 22. This can allow a provider of pumps, such as a manufacturer, to easily provide the shaft cover 23 even for a pump that does not comprise a shaft cover.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an electric pump.

Background Art

[0002] For example, in the pump described in Patent Document 1, the rotor shaft is directly connected to the impeller, and a cylindrical shaft cover that covers the rotor shaft is provided between the pump casing and the motor housing to prevent contact between foreign matter and the rotor shaft.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The shaft cover according to the pump described in Patent Document 1 is an integrally molded product with the casing cover by casting. Therefore, in types that do not have a shaft cover, in order to newly provide a shaft cover, it is necessary to newly prepare a casting mold for the casing cover.

[0005] In view of the above points, the present disclosure discloses, for example, an example of a pump that can easily provide a shaft cover in a pump that does not have a shaft cover.

Means for Solving the Problems

[0006] The pump preferably comprises, for example, at least one of the following components: an impeller (21) rotated by an electric motor (10), a shaft (11) that transmits rotational force from the electric motor (10) to the impeller (21), a casing (22) that houses the impeller (21), and a shaft cover (23, 23A, 23C) positioned between the casing (22) and the electric motor (10) and covering the shaft (11), wherein the shaft cover (23, 23A, 23C) is expandable and contractible in a direction parallel to the shaft (11) (hereinafter referred to as the axial direction).

[0007] In this pump, since the shaft covers (23, 23A, 23C) are expandable and contractible in the axial direction, even if the dimensions between the casing (22) and the electric motor (10) are different, the shaft covers (23, 23A, 23C) can expand and contract to absorb the difference in dimensions.

[0008] Furthermore, the manufacturer of the pump can treat the shaft cover (23, 23A, 23C) as a separate component independent of the casing (22). Therefore, manufacturers and other pump providers can easily install shaft covers (23, 23A, 23C) on pumps that do not originally have them.

[0009] Incidentally, the symbols in each of the parentheses above are just examples showing the correspondence with the specific configurations etc. described in the embodiments described later, and this disclosure is not limited to the specific configurations etc. indicated by the symbols in the parentheses above. [Brief explanation of the drawing]

[0010] [Figure 1] This is a diagram showing a pump according to the first embodiment. [Figure 2] This is an exploded view of the pump according to the first embodiment. [Figure 3] This is a diagram showing a casing cover according to the first embodiment. [Figure 4] This is a diagram showing a pump according to the first embodiment. [Figure 5] This figure shows a shaft cover according to the second embodiment. [Figure 6] This figure shows a shaft cover according to the third embodiment. [Modes for carrying out the invention]

[0011] The following "Embodiments of the Invention" are examples of embodiments that fall within the technical scope of this disclosure. In other words, the features defining the invention as described in the claims are not limited to the specific configurations and structures shown in the embodiments below.

[0012] The arrows and diagonal lines indicating direction in each figure are included to facilitate understanding of the relationships between the figures and the shapes of each component or part. Therefore, the inventions shown in this disclosure are not limited to the directions indicated in each figure.

[0013] At least one of the components or parts described with reference numerals is provided unless otherwise specified, such as "one". In other words, if there is no such specification, such as "one", there may be two or more such components. The pumps shown in this disclosure include at least one of the components, such as the components or parts described with reference numerals, and at least one of the illustrated structural parts.

[0014] (First Embodiment) <1. Pump Overview> This embodiment applies an example of the pump according to this disclosure to an electric pump for water supply. As shown in Figure 1, the pump 1 comprises at least a motor unit 10 and a pump unit 20, etc. The motor unit 10 is composed of an electric motor, etc.

[0015] <Pump section> As shown in Figure 2, the pump unit 20 includes at least an impeller 21, a casing 22, and a shaft cover 23. The impeller 21 is a turbine that is rotationally driven by the motor unit 10. The impeller 21 is directly connected to the rotor shaft 11 of the motor unit 10.

[0016] The rotor shaft 11 (hereinafter referred to as the shaft 11) is integrated with a rotor (not shown) of the motor unit 10 and is an output shaft that rotates together with the rotor. That is, the shaft 11 constitutes a transmission shaft that transmits rotational force from the motor unit 10 to the impeller 21.

[0017] The casing 22 houses the impeller 21. The casing 22 has at least a casing body 22A and a casing cover 22B and the like. As shown in FIG. 1, a suction port 22C and a discharge port 22D are provided in the casing body 22A.

[0018] The casing cover 22B is disposed on the opposite side of the casing body 22A across the impeller 21 and is fixed to the casing body 22A. The casing cover 22B cooperates with the casing body 22A to form a space for housing the impeller 21.

[0019] As shown in FIG. 3, the casing cover 22B has at least a cover plate 22E, a mounting flange portion 22F, and a plurality of spoke portions 22G and the like. The casing cover 22B according to the present embodiment is an integral part in which the cover plate 22E, the mounting flange portion 22F, and the plurality of spoke portions 22G and the like are integrally formed of an iron-based metal such as an FC material.

[0020] The cover plate 22E is a portion configured in a substantially disk shape. A shaft hole 22H is provided on the center side of the cover plate 22E. The shaft hole 22H is a through hole for inserting the shaft 11 into the casing 22.

[0021] Note that a shaft seal device 24 (see FIG. 1) such as a mechanical seal is disposed on the inner peripheral side of the shaft hole 22H in the cover plate 22E. The shaft seal device 24 is a sealing means for suppressing leakage of fluid in the casing 22 from the gap between the shaft 11 and the shaft hole 22H.

[0022] The mounting flange portion 22F is an annular portion on which the motor portion 10 can be mounted. As shown in Figure 2, the mounting flange portion 22F is located offset from the cover plate 22E towards the motor portion 10.

[0023] The multiple (four in this embodiment) spoke portions 22G are legs that support the mounting flange portion 22F. In other words, each spoke portion 22G extends substantially radially from the outer circumference of the annular mounting flange portion 22F and is connected to the outer circumference of the cover plate 22E.

[0024] Therefore, the space formed between the cover plate 22E and the mounting flange portion 22F becomes an open space communicating with the outside of the pump portion 20, as shown in Figure 3. In other words, the mounting flange portion 22F side of the shaft hole 22H becomes an open space to the atmosphere (see Figure 4).

[0025] <Shaft cover> As shown in Figure 1, the shaft cover 23 is a covering member positioned between the casing 22 and the motor unit 10 to cover the shaft 11. The shaft cover 23 is expandable and contractible in a direction parallel to the shaft 11 (hereinafter referred to as the axial direction).

[0026] Specifically, the shaft cover 23 is configured in a coil spring shape that is elastically deformable in the axial direction. "Coil spring shape" means that the wire material constituting the shaft cover 23 is curved spirally with the shaft 11 as its centerline.

[0027] The shaft cover 23 is pressed against the cover plate 22E and the motor unit 10 by the elastic force generated by elastic deformation. "Pressed against" means that the shaft cover 23 is in contact with the cover plate 22E and the motor unit 10 while pressing against them.

[0028] The coil spring forming the shaft cover 23 can be further compressed and deformed from its state when installed on the pump 1 (see Figure 1). In other words, the shaft cover 23 is installed in a compressed and deformed state, thereby achieving the aforementioned press-fit state.

[0029] Furthermore, even in this pressed-together state, the wires constituting the shaft cover 23 are not in close contact, and gaps exist between the wires. In other words, the inside and outside of the shaft cover 23 are in communication with each other.

[0030] The shaft cover 23 is positioned by being fitted onto the outer circumference of the convex portion 22J (see Figure 3) that constitutes the shaft hole 22H. In other words, the coil-shaped cylindrical portion that constitutes the shaft cover 23 is fitted onto the convex portion 22J.

[0031] <3. Features of the pump according to this embodiment> In the pump 1 according to this embodiment, since the shaft cover 23 is expandable and contractible in the axial direction, even if the pump is of a different type with different dimensions between the casing 22 and the motor section 10, the shaft cover 23 can expand and contract to absorb the difference in dimensions.

[0032] Furthermore, the manufacturer of the pump 1 can treat the shaft cover 23 as a separate component independent of the casing 22. Therefore, the manufacturer or other provider of the pump 1 may be able to easily attach the shaft cover 23 to pumps that do not have a shaft cover (for example, existing pumps).

[0033] In the shaft cover 23, the wires constituting the shaft cover 23 are not tightly packed together, and gaps exist between the wires. In other words, the coil-shaped cylindrical portion constituting the shaft cover 23 has holes that penetrate in a direction intersecting the axial direction. Therefore, for example, the manager of the pump 1 can visually check for water leakage from the shaft seal device 24 through these holes / gaps.

[0034] Incidentally, even with a normal shaft seal device 24, a small amount of water leakage occurs as water vapor. In contrast, the shaft cover 23 according to this embodiment is a cover with holes as described above, so the water vapor can be quickly released into the atmosphere. Therefore, it is possible to suppress the entry of water vapor into the motor section 10.

[0035] (Second Embodiment) As shown in Figure 5, the shaft cover 23A according to this embodiment is made of a cylindrical rubber tube. The shaft cover 23A is provided with a plurality of holes 23B that penetrate in the diametrical direction.

[0036] (Third embodiment) As shown in Figure 6, the shaft cover 23C according to this embodiment is composed of a cylindrical portion 23D made of a transparent material such as acrylic, and elastically deformable cylindrical elastic portions 23E and 23F provided at least one of the axial ends (both ends in this embodiment) of the cylindrical portion 23D.

[0037] The elastic parts 23E and 23F are made of rubber tubing or coil springs. If the elastic parts 23E and 23F are rubber tubing, then one of the cylindrical part 23D, the elastic parts 23E, or 23F is provided with multiple holes that penetrate in the diametrical direction.

[0038] (Other embodiments) The shaft covers 23, 23A, and 23C in the embodiments described above were simple cylindrical in shape. However, the disclosure is not limited thereto. That is, the disclosure may include, for example, a bellows-shaped shaft cover or a telescopic shaft cover made up of multiple cylinders.

[0039] The shaft 11 in the above-described embodiment was an output shaft integrated with the rotor. However, the disclosure is not limited thereto. That is, the disclosure may also include, for example, a shaft in which a shaft coupling is interposed between the rotor and the impeller 21.

[0040] The shaft covers 23, 23A, and 23C in the embodiments described above were cylindrical. However, the disclosure is not limited thereto. That is, the disclosure may, for example, be a rectangular tubular shaft cover.

[0041] In the shaft covers 23, 23A, and 23C according to the above-described embodiment, a plurality of through holes were provided. However, this disclosure is not limited thereto. That is, the disclosure may, for example, have a configuration in which such holes are eliminated.

[0042] The holes in the second and third embodiments described above were through holes in the diametrical direction. However, this disclosure is not limited thereto. That is, the disclosure is sufficient if, for example, the hole is through in a direction intersecting the axial direction.

[0043] The shaft covers 23, 23A, and 23C in the above-described embodiment were configured to press against the casing 22 and motor section 10 due to the elastic force generated by elastic deformation. However, the disclosure is not limited thereto.

[0044] The shaft covers 23, 23A, and 23C in the above-described embodiment were configured to be fitted and fixed to the casing 22. However, the disclosure is not limited thereto. That is, the disclosure may also include a configuration in which the shaft cover 23 is fixed to the motor unit 10, for example.

[0045] Furthermore, this disclosure is not limited to the embodiments described above, but is sufficient to be consistent with the intent of the disclosures described in the embodiments described above. Therefore, it may be a configuration in which at least two of the embodiments described above are combined, or a configuration in which any of the illustrated components or components described with reference numerals in the embodiments described above are omitted. [Explanation of Symbols]

[0046] 1... Pump 10... Motor unit 11... Rotor shaft 20... Pump unit 21… Impeller 22… Casing 22A… Casing body 22B… Casing cover 22E… Cover plate 22F… Mounting flange section 22H… Shaft hole 22G… Spoke section 23… Shaft cover 24… Shaft seal device

Claims

1. An impeller that is driven to rotate by an electric motor and A shaft that transmits rotational force from the electric motor to the impeller, A casing for housing the impeller, A shaft cover is disposed between the casing and the electric motor and covers the shaft, and comprises a shaft cover that is extendable and retractable in a direction parallel to the shaft (hereinafter referred to as the axial direction), The shaft cover is elastically deformable in the axial direction. Furthermore, the shaft cover is a cylindrical body in which at least a portion is made of an elastic material. The aforementioned cylindrical body is provided with a hole that penetrates in a direction intersecting the axial direction.

2. The pump according to claim 1, wherein the shaft cover is pressed against the casing and the electric motor by the elastic force generated by elastic deformation.

3. The shaft is a rotor shaft integrated with the rotor of the electric motor, Furthermore, the pump according to claim 1, wherein the impeller is connected to the shaft.

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