JPS62135696A - Vertical pump - Google Patents

Abstract

PURPOSE:To easily cope with the depth of a liquid storage tank and a decrease of the liquid level by providing a cylindrical adapter having an opening section communicated to the intake port of a casing encircling an impeller at one end and connected to a siphon at the other end. CONSTITUTION:A vertical motor 12 is fitted to the upper face of a tank 1 via a flange 12a, and an impeller 4 is fixed to the lower end section of a rotary shaft 12b immersed in a liquid 3 stored in the tank 1. A casing 5 encircling the impeller 4 is formed integratively with the lower face of the flange 12a via stanchions 6, 7, and an intake port 5a of the liquid 3 is provided on the upper face of the casing 5 so as to encircle the rotary shaft 12b. In this constitution, a cylindrical adapter 11 is arrange between the stanchions 6, 7. An annular opening section 11a communicated to the intake port 5a and a shaft sealing device 13 are provided at one end of the adapter 11, and a siphon 14 is connected to the other end.

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention provides a vertical pump that can easily cope with a drop in the depth and liquid level of the liquid storage tank in which the pump is installed. related to things.

[Prior art and its problems]

A conventional example of a vertical pump will be explained based on FIG.

This figure shows a vertical pump that transfers cutting fluid for machine tools stored in a tank 1 by immersing only the pump part. An impeller 4 is fixed to the lower end of the rotating shaft 2b, which is immersed in the liquid 3 stored in the rotary shaft 2b. A casing 5 surrounding the impeller 4 is integrally formed with the lower surface of the flange 2a via struts 6.7 shown in FIG. A suction port 5a is provided.

One of the pillars 6 is provided with a discharge passage 6a in its center that communicates with the outer circumference of the casing 5 and opens outward above the tank 1, through which the liquid 3 sucked from the suction port 5a as the impeller 4 rotates. It is designed to be transferred to the outside through the discharge path 6a. The liquid 3 transferred to the outside is discharged through the discharge path 6
After passing through a transfer pipe (not shown) connected to a and used as a cutting fluid for machine tools, etc., it is collected into the tank 1 through a recovery pipe 8. A protrusion 7a is provided on the outer surface of the other support column 7 to indicate the limit liquid level at which the pump operates normally, and this protrusion 7a
During operation, the liquid level is monitored to ensure that it does not drop.

The liquid level in the tank 1 decreases by the volume of the liquid 3 transferred to the outside as the pump operates, and when the liquid 3 is consumed as cutting fluid etc., the liquid level becomes lower than the limit liquid level indicated by the protrusion 7a. It may decrease. If the pump part is exposed to the air in such a state, the pump will not be able to operate normally. In order to prevent this, it is necessary to reliably monitor the liquid level in the tank 1 during operation and replenish the liquid 3 into the tank 1 so that the liquid level does not fall below the protrusion 7a, or to install a large floor area. It is necessary to use the tank 1 and store a large amount of liquid 3 to reduce the drop in the liquid level, but the former requires a lot of effort for monitoring and replenishment, and the latter requires a large tank 1. There is a drawback that not only a large amount of liquid 3 is required, but also a large space is required for installing the tank 1. In addition, pump supports 6 and 7 were prepared with different lengths depending on the depth of the tank 1, but the length of the rotating shaft 2b was adjusted depending on the length of the support supports 6 and 7 to ensure mechanical strength. In order to increase the length without decreasing the length, it is necessary to increase the thickness of the rotating shaft 2b, which results in an increase in the size of the entire pump, which also has the disadvantage of hindering standardization.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a vertical pump that can easily cope with a drop in the depth and liquid level of a liquid storage tank in which the pump is installed.

[Key points of the invention]

In order to achieve the above-mentioned object, the present invention has a downward opening communicating with the suction port on the upper surface of the casing surrounding the impeller. A cylindrical adapter is attached to connect the upper end of the suction pipe so that the pump can operate normally even if it is exposed to the air.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, and the same parts as in FIGS. 3 and 4 are designated by the same reference numerals. In this figure, a cylindrical adapter 11 is passed between the pump struts 6 and 7 and attached at one end to the upper surface of the gauging 5. One end of this adapter 11 surrounds the lower end of the rotating shaft 12b of the vertical motor 12 attached to the upper surface of the liquid storage tank 1 with a flange 12a, as shown in FIG. There is an annular groove that extends downward. A tank 1 is provided on the lower surface of the other end of the adapter 11.
A suction pipe 14, which opens at the lower part, is screwed at its upper end.

According to the embodiment, even if the liquid level in the tank 1 decreases due to operation of the pump or due to depletion of the liquid 3 and the pump part is exposed to the air, the liquid level does not reach the lower end surface of the suction pipe 14. If it is higher up, the pump can operate normally.

Also, if the depth of the tank 1 is different, the pump support 6,
Since this can be done by simply changing the length of the suction pipe 14 without changing the length of 7, the pump can be effectively miniaturized and standardized.

〔Effect of the invention〕

According to this invention, in the vertical pump, the upper surface of the casing surrounding the impeller has a downward opening that communicates with the suction port. ! Attach a cylindrical adapter that connects the upper end of the suction pipe that opens at the bottom of the liquid storage tank to the other end. If the liquid level is above the lower end of the suction pipe, pump This allows the pump to operate normally even if it is exposed to the air, so it is possible to easily respond to a drop in tank depth and liquid level by simply replacing the suction pipe, and this also allows the pump to be made smaller. The effect is that it can be standardized and standardized.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the main part of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3; 1... Tank, 4... Impeller, 5... Casing, 5a... Suction port, 6, 7... Support, 11...
・Adapter, 11a...opening, 12...morph,
12a...flange, 12b...rotating shaft, 14...
・Suction pipe. Figure 2

Claims (1)

[Claims] 1) An impeller is fixed to the lower end of a rotating shaft of a vertical motor attached to a liquid storage tank with a flange, and a casing surrounding the impeller is integrally formed on the lower surface of the flange via a support, and the upper surface of the casing is In a pump having a suction port surrounding a rotating shaft passing through the casing, the upper surface of the casing has a downward opening that surrounds the rotating shaft at one end and communicates with the suction port, and the other end has a downward opening that surrounds the rotating shaft and communicates with the suction port. A vertical pump characterized by being equipped with a cylindrical adapter that connects the upper end of a suction pipe that opens at the bottom of the tank.