JPS58106194A - Pump device - Google Patents

Abstract

PURPOSE:To extend the life of a seal member by providing an intake port and discharge port at the upper and lower positions of a casing, by arranging the seal member of a drive shaft on the intake side, and by forming an air reservoir below it so as to prevent the conveyed fluid from contacting directly to the seal member. CONSTITUTION:An intake port 28 and discharge port 26 are provided at the upper and lower positions of a pump casing 11, and an air reservoir 23 is formed in a cylindrical member 21 below the seal member 22 inserted into the cylindrical member 21 at the upper position of an impeller drive shaft 20. Accordingly, during the operation a solenoid opening/closing valve 32 is opened and an air feed pipe 31 is opened to the atmosphere, then since the air reservoir 23 portion is located on the intake side, the air is fed into the air reservoir 23, and the lower portion of the seal member 22 is filled with the air. Therefore, the high pressure conveyed fluid is not put into a direct contact with the seal member 22, which is thus prevented from being worn, and its long life can be available.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a pump device, and more particularly to a leak-free vertical liquid transfer pump device.

Technical background of the invention and its problems Generally, in a vertical liquid transfer pump system, an impeller drive shaft that drives an impeller is inserted from above the pump casing, and between the Innovella drive shaft and the casing, A sealing member such as a packing or a mechanical seal is provided to prevent liquid leakage. This sealing member is usually located above the casing! However, in conventional pump devices, the liquid discharge port is
Since this seal member is disposed above the casing, this seal member is disposed on the pump discharge side. Therefore, during operation, the sealing member is always in contact with the high-pressure transfer liquid, and the sealing member is constantly exposed to chemical liquids such as acids and alkalis, or soil and sand.
When transferring waste liquid containing slurry, these substances enter between the sealing member and the Innovella drive shaft, corrode the sealing member and the Innovella drive shaft, and significantly shorten their service life. was there.

Purpose of the Invention The present invention has been made in consideration of the above points,
Provides a vertical liquid transfer pump IT that prevents high-pressure transfer liquid from coming into direct contact with the seal member, prevents wear and tear of the seal member, increases the life of the seal member, and completely prevents liquid leakage. The purpose is to

Key Points of the Invention The present invention provides for the suction port and the discharge port to be located at the upper and lower positions of the pump casing, respectively! The sealing member is arranged and installed on the pump suction side (decompression side), and
It is characterized in that an air pocket is formed below the seal member to prevent the transferred liquid from coming into direct contact with the seal member.

Embodiment of the Invention Hereinafter, embodiment 1 of the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view showing a dormitory embodiment of a pump device according to the present invention. In the figure, the symbol /l is a pump casing, and the upper and lower ends of the cylindrical body 12 are covered with an upper plate 15 and a bottom plate 15 through packings 7/3, respectively. It is sealed by tightening with 6.

A weir plate /1 having an opening 17 in the center is installed below the casing //, and between this weir plate /1 and the bottom plate 15 K,
A7P')/9 is provided. The impeller 19 passes through the upper plate 4' and the opening 17 from above the casing and is fixed to the lower end of the impeller drive shaft J disposed on the vertical surface. The impeller drive shaft 2o is fixed to the upper plate of the casing l/UK and is surrounded by a cylindrical member 21 that extends downward and has an open bottom end, and is fitted into the cylindrical member j/ at the upper position thereof. The sealed seal member U is in close contact with the other. Therefore, an air pocket is formed below the seal member n by the cylindrical member 2/. Note that as the seal member n, a rubber gasket, a mechanical seal, etc. can be used. A driving motor y for rotationally driving the impeller /q is attached to the upper part of the upper plate l of the casing /l, and is connected to the impeller drive shaft.

A discharge rod is opened in a space J surrounded by a bottom plate /S and a weir plate /1 at a lower position of the casing //, and a discharge pipe 2
7 is connected. Further, a suction port U is opened at a position above the casing //, and is connected to a suction pipe 3Q provided with a priming cup 29.

Further, an air supply pipe 31 is connected to the air pocket force formed below the seal member n, and this supply pipe 31
is guided to the outside of the casing // and connected to the electromagnetic on-off valve 32.

A pipe 33 (which connects the lower space J and the upper space inside the casing l/) is installed in the weir plate /l. This pipe 33 jets out pressurized water from the space S as the impeller 19 rotates, and serves as a call line at the time of restart, thereby completing the self-priming action. Furthermore, since the liquid level is kept constant, moxibustion is prevented from occurring due to dry running of the pump.

Next, I will clarify the voice production of this embodiment having such a configuration.

When motor J starts rotating, impeller 1 is rotated by drive shaft J.
9 is rotated Wl, and the liquid remaining in the lower part of the casing l/ is forcefully fed to the discharge pipe 27. As a result, the pressure in the upper space inside the casing 1 is reduced, liquid is sucked up from the suction pipe 30, and the pump performs a continuous liquid transfer operation.

During this operation, if you open the solenoid on-off valve 3:2 and leave the air supply pipe 31 open to the atmosphere & CIFll, an air pocket of 2J
Since the part is located on the suction side of the pump (decompression side), air is supplied to the air reservoir or JK, and air is pumped below the seal member n. Therefore, the liquid being transferred does not come into direct contact with the seal member n, and chemical solutions, dirt, slurry, etc. do not enter between the seal member n and the drive shaft I.

When stopping the operation, close the electromagnetic on-off valve 72.
The air inside the air reservoir remains without being released to the outside, and no liquid leaks from the pipe 31.

When the operation is restarted, pressure water is jetted out from the pipe jjK to maintain the liquid level, so that the self-priming effect is effectively achieved.

FIG. 1 is a sectional view showing an embodiment of the pump device according to the present invention. In this embodiment, the lower end of the cylindrical member 3q to which the seal member 2 is attached is located above the liquid level υ when the operation is stopped, and the air supply pipe 3S is not connected to the cylindrical member 3ψ, and the air supply pipe 3S is not connected to the cylindrical member 3ψ, The pipe 30 is connected to a portion of the discharge pipe 27 which is bent so as to be above the liquid level. Moreover, the weir plate 36 and the impeller/9 are arranged in multiple stages to increase the discharge pressure.

By piping the 9 air supply vibe 35 in this way,
At the start of operation, air in the discharge pipe 27 flows into the suction pipe, ? (1)
f! 11, and pump casing/
1, and the steam formed below the seal member 22 can enter the air pocket 3F. At the same time, a part of the child liquid is sent to the suction pipe 30@11, and the casing ii
Since the upper 9 spaces of the pump are pumped with liquid, the pump has a good white sound.

Effects of the Invention 4FW9 As explained, according to the present invention, the sealing member of the impeller drive shaft is connected to the suction f! of the pump. Since the air pocket is formed below the seal member, it is easy for the transferred liquid to come into contact with the seal member at high pressure, and there is a gap between the seal member and the impeller drive shaft. , chemical solutions, earth and sand, slurry, etc. will not enter. Therefore, it is possible to obtain a pump device in which the seal member is less damaged (the seal life is increased, and no liquid leakage occurs).

The pump device according to the present invention is particularly effective when used as a wastewater treatment pump or a slurry pump containing a chemical liquid in the transferred liquid.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a pump device according to the invention, and FIG. 2 is a sectional view showing another embodiment of the invention. //...Casing, 19...Impe U1. W.
・Impeller drive shaft, cylindrical member, n...seal member, force...air pocket, easy...discharge port, 2♂...
・Intake port, 3/...Air supply pipe. Applicant's agent Kiyomi Inomata Figure 1 Figure 2

Claims (1)

[Claims] A closed casing having an inlet and an outlet, and a MilF
an impeller disposed within a casing; an impeller drive motor disposed above the exterior of the casing; an impeller drive shaft connecting the impeller and the drive motor; and an impeller drive shaft disposed above the casing. In a vertical liquid transfer pump device equipped with a seal member that seals between the casing and the impeller drive shaft, the suction port and the discharge port are provided at positions above and below the casing, respectively. a pump device, characterized in that an air pocket is formed below the sealing member;