JP3580683B2 - Direct acting pump - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a direct-acting pump in which a motor unit and a pump unit are integrated, and more particularly to a direct-acting pump in which an impeller of the pump unit can be more easily and reliably attached and detached.
[0002]
[Prior art]
A conventional general direct acting two-stage pump is shown in FIGS. This is configured such that a motor unit 12 for driving the main shaft 10 and a pump unit 14 for pumping water by the rotation of the main shaft 10 are integrally connected, so that the pressure water of the pump unit 14 does not leak to the motor unit 12 side. , A mechanical seal 16 is provided around the main shaft 10. The main shaft 10 is rotatably supported via a bearing 18.
[0003]
The motor section 12 is surrounded by a motor casing 20, while the pump section 14 is covered by a pump casing 28 having a discharge port 22 and a suction port 24, and two-stage pump chambers 26a and 26b are formed therein. . The motor casing 20 and the pump casing 28 are each formed with a flange at a peripheral edge portion, and are fixed by bolts with a partition plate 30 separating the motor space and the pump space therebetween.
[0004]
Inside the pump chambers 26a and 26b of the pump section, two impellers 32a and 32b are integrally attached to the main shaft 10 via blade stopper nuts 34, respectively. Around the impellers 32a and 32b, diffuser members 36a and 36b that form diffuser flow paths for efficiently recovering fluid energy are provided. Each of the diffuser members 36a and 36b is a disk-shaped member having a side wall. Is fixed.
[0005]
In the pump having such a configuration, when the main shaft 10 rotates, the fluid flowing from the suction port 24 is accelerated by the impellers 32a and 32b at each stage, and the kinetic energy is recovered as pressure by the diffuser members 36a and 36b. , Are sequentially discharged from the discharge port 22 of the pump casing 28.
[0006]
In this pump, in order to attach and detach the impeller 32a, it is necessary to attach and detach the impeller nut 34. For this reason, the end face of the main shaft 10 on the motor unit 12 side is exposed to the outside, and here, as shown in FIG. 4, a minus groove 10a is provided. Then, with the tip of a flathead screwdriver inserted into the slot 10a to restrict the rotation of the main shaft 10, the blade stop nut 34 is rotated by a spanner to attach and remove the blade stop nut 34. Was.
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional example, since the connection between the main shaft 10 and the driver is formed by the engagement between the minus groove 10a and the tip of the minus driver, the torque for rotating the blade stopper nut 34 can be supported. Instead, the driver could come off.
[0008]
SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a direct-acting pump capable of stably and easily restraining rotation of a main shaft and easily and reliably attaching and detaching an impeller.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, the motor unit and the pump unit that share the main shaft are integrally provided adjacent to each other via a partition plate , and the impeller is provided at the pump unit side end of the main shaft via a blade stopper nut. In the mounted linear motion pump, a detent portion having two flat portions parallel to each other is provided at a portion of the main shaft on the pump portion side, and a corresponding tool for inserting a tool into a casing of the motor portion is provided. A direct acting pump characterized by having an opening.
[0010]
Thereby, a tool such as a wrench is inserted into the motor casing from an opening provided in the casing of the motor unit , and a familiar tool such as a wrench or a wrench is engaged with the detent provided on the main shaft. By constraining the main shaft and rotating the blade stopper nut using another tool in this state, the main shaft can be firmly constrained with a small force and stable work can be performed.
[0011]
The invention according to claim 2 is characterized in that a bearing is provided on the pump unit side of the motor body of the motor unit, and the detent unit is disposed on the pump unit side of the bearing. A direct-acting pump according to item 1. This position is a position close to the pump section side and has good workability when working alone, and since it is near the bearing, there is little shaft runout and stable rotation can be performed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a motor-integrated two-stage pump according to an embodiment of the present invention will be described with reference to FIGS. Note that this pump has the same basic configuration as the conventional example shown in FIG. 3, and therefore, the same members will be denoted by the same reference numerals and description thereof will be omitted, and different points will be described below.
[0014]
The main shaft 10 is rotatably supported by a bearing 18 disposed in a motor casing 20, and is liquid-sealed by a mechanical seal 16 provided on the pump section 14 side of the partition plate 30. The main shaft 10 is provided with a detent for preventing detent by a tool such as a spanner between the mechanical seal 16 on the pump part side and the bearing 18. That is, a pair of chamfered portions (rotation preventing portions) 10b, 10b parallel to each other are provided on the outer peripheral portion of the main shaft 10. The motor casing 20 is provided with an opening 20a at a position corresponding to the chamfered portions 10b, 10b for inserting a tool.
[0015]
The interval W between the chamfered portions 10b, 10b is set to be equal to the width of the opening of a tool such as a spanner used for preventing the main shaft 10 from rotating. The opening 20a of the motor casing 20 is set to a size that allows the wrench to be inserted.
[0016]
When the impeller 32a is attached and detached in the pump having such a configuration, a spanner is inserted into the motor casing 20 from the opening 20a provided in the motor casing 20, and the chamfered portions 10b and 10b provided on the main shaft 10 are inserted into the motor. The rotation of the main shaft 10 is restricted by engaging the wrench. In this state, the blade stopper nut 34 is rotated using another spanner or the like.
[0017]
As described above, when the spanner is used to stop the rotation of the main shaft 10, by holding the end of the handle of the spanner, it is possible to oppose the rotation torque applied to the main shaft 10 with a small force when the blade stop nut 34 is rotationally driven. it can. Moreover, since the opening 20a is provided near the boundary between the motor section 12 and the pump section 14, the rotation of the main shaft 10 is restrained by one hand, and the blade stopper nut 34 is rotated by the other hand, whereby 1 The work can be easily performed by humans.
[0018]
In this embodiment, the detent portions 10b, 10b are provided on the pump portion 14 side of the motor portion 12, but are not limited to this, and may be provided at appropriate locations as long as they can be operated by a spanner. Can be. Further, in this embodiment, the detent portions 10b, 10b have two parallel surfaces as shown in FIG. 2. However, it is necessary to use an appropriate shape so that the tool can be engaged from the side. Can be.
[0019]
【The invention's effect】
As described above, according to the present invention, by engaging a tool with the rotation preventing portion provided on the main shaft, the main shaft is firmly restrained with a small force, and the impeller can be easily and reliably attached and detached. It is possible to provide a pump with good workability for maintenance and repair.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a direct acting two-stage pump showing an embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a sectional view showing a conventional general direct acting two-stage pump.
FIG. 4 is a side view of an end face of the spindle shown in FIG. 3 on a pump section side.
[Explanation of symbols]
Reference Signs List 10 Main shaft 10b Non-rotating part 12 Motor part 14 Pump part 16 Mechanical seal 20 Motor casing 20a Opening 28 Pump casings 32a, 32b Impeller 34 Blade stopping nut

Claims (2)

In a direct-acting pump in which a motor unit and a pump unit that share a main shaft are provided adjacently and integrally via a partition plate, and an impeller is attached to a pump unit side end of the main shaft via a blade stopper nut,
A rotation preventing portion having two flat portions parallel to each other is provided in a portion of the main shaft on the side of the pump portion, and an opening for tool insertion is provided in a casing of the motor portion corresponding to the rotation preventing portion. Direct acting pump. 2. The direct acting pump according to claim 1, wherein a bearing is provided on the pump section side of the motor body of the motor section, and the rotation preventing section is arranged on the pump section side with respect to the bearing. 3.

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