JPS593200A - Vertical-shaft magnetically-coupled pump - Google Patents

Abstract

PURPOSE:To centrifuge mixed grains in a transferred liquid and protect the bearing of a vertical-shaft magnetically-coupled pump by penetrating a pump chamber and an exhaust liquid reservoir tank and providing a separation disk covering its opening and opened at the center. CONSTITUTION:A side wall 8 divides and partitions the interior of a pump into a pump chamber 9 and an exhaust liquid reservoir tank 10, and the side wall 8 has multiple openings 11 penetrating the pump chamber 9 and exhaust liquid reservoir tank 10. A separation disk 12 is conically provided from the inner periphery of the exhaust liquid reservoir tank 10 toward the center, and a circular opening is provided at the center, thus completely covering the opening 11. A bearing lubricating liquid passes the opening of the side wall along 23, 23a, 23b, and part of mixed grains in the liquid collides with the separation disk and is separated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetically coupled pump, which is configured to be suitable for transferring a slough IJ + mixed chemical liquid, or a chemical liquid mixed with crystalline particles, and sometimes relates to the protection of a bearing part. .

In recent years, with the progress of the chemical industry, the use of pumps for pumping free or crystalline granules together with chemical liquids has increased. Although it is strongly desired that the containing liquid be delivered with iiJ' capacity, there is no example of this being put to practical use yet.

Conventional magnetically coupled pumps are generally introduced into a stacked ink box at the rear of the pressure-formed impeller coming out of the impeller to forcibly cool the space between the shaft and bearing. However, if slurry is mixed into the liquid in this type of pump, fine particles are forced to be carried between the shaft and the bearing, and between the rotating ring and the stationary ring of the thrust bearing, which has the disadvantage of causing extreme wear on the bearing. are doing.

Attempts have been made to use special hard materials such as cemented carbide, ceramic, C, and silicon carbide for shafts, bearings, and thrust bearings, but the proportion of slurry or crystalline particles in the liquid If it increases, there is no effect, and the lychee ring part (one cap part) has a defect that is extremely worn and cannot be put into practical use.

In the past, the present inventor has developed a magnetically coupled pump as shown in FIG. A similar idea was devised, featuring a bearing inside the tank, but the flow rate passing through the tank was turbulent, and there were still unresolved problems in effectively settling the slurry particles. As a result of research, we discovered that the problem could be solved by installing a tank that has a centrifugal force effect due to swirling flow, which is separate from the discharge liquid passage, and installing a bearing inside it.

On the other hand, when conventional pumps use a closed type impeller for conveying the slurry mixed liquid, the lychee ring wears heavily and the performance deteriorates in a short period of time, and when an open type impeller is used, It is necessary to always maintain a small gap between the front face of the impeller and the casing, but this type of pump is subject to severe wear and is likely to cause a drop in performance. It has difficult drawbacks.

The present invention has a completely different concept from the conventional ones, and provides a magnetically coupled pump with all of these defects removed. An axle-shaft magnetically coupled pump in which the inside of the pump is partitioned by a non-magnetic partition wall, the pump has seven side walls that partition the inside of the pump into a pump chamber and a discharge liquid reservoir tank, and an opening is provided in the side wall to separate the pump chamber and the discharge liquid reservoir tank. A separation disk with an open center is provided to cover the opening, and a bearing is installed in the center of the discharged liquid storage tank, and particles mixed in the transferred liquid are removed from the separation disk and discharged. The rotation of the liquid in the liquid storage tank is separated by the centripetal force to maintain the tilt of the bearing 'S, and also makes contact with the pump casing wall facing the front of the open type impeller, or with the sliding material attached to the pump casing wall. To provide an axle-shaft magnetically coupled pump characterized in that it is configured to rotate as follows.

The calling side will be described below with reference to the embodiment shown in FIG.

In FIG. 1, 1 is a prime mover, 2 is a magnet mounting member, 3 is a driving permanent magnet, and 4 is a driven permanent magnet, which are attached to a pump shaft 5 via a magnet mounting member 6. Reference numeral 1 denotes a partition wall made of a non-magnetic material, which partitions rotation due to mutual magnetic attraction between the driving permanent magnet and the driven permanent magnet in a non-contact state.

The side wall 8 connects the inside of the pump to a pump chamber 9 and a discharge liquid reservoir tank 1.
The side wall has a plurality of openings 11 passing through the pump chamber and the discharge liquid reservoir tank.

Reference numeral 12 denotes a separation disk integrally formed with the discharge liquid reservoir tank, and is provided so as to completely cover the opening as shown in the figure. This separation disk is provided in a mortar shape from the inner periphery of the discharge liquid storage tank 10 toward the center, and has a circular opening in the center. This separation disk is not manufactured integrally with the discharged liquid storage tank, but may be manufactured in a removable manner, or may have a dish-like shape, but the inner surface of the discharged liquid storage tank and the surface of the separation disk may be It is necessary to finish it as smoothly as possible and to make it into a substantially perfect circle without any protrusions.

The impeller 1''3 has an open type shape, is partitioned by the side wall 8, and is fixed to the pump shaft end 5' opposite the driven permanent magnet 4.

A bearing 14 is provided in the center of the side wall 8 so as to be located in the center of the discharge liquid reservoir tank. 15 is a sliding member attached to the pump casing wall 16 facing the front surface of the open type impeller. In the embodiment, the sliding member 15 is made of silicon carbide material, and the impeller 13'' is made of ceramic (A12
0s) material.

If the pump casing wall surface is made of wear-resistant material, the sliding material is unnecessary. (Hereinafter, the state in which the slider is attached will also be referred to simply as the pump casing wall surface.) 1γ is a stirring blade, which is attached to the pump shaft at a position slightly above the upper part of the bearing 14.

L8a, 18 is an O-ring. The liquid enters the pump through the suction port 19, is energized by the impeller, and is sent through the pump discharge port 20, partially damping the bearing f#.
The liquid is divided into a discharge liquid storage tank and returns to the pump chamber through between the shaft and the bearing.

21 is an air vent plug, 22 is a stand, 7 and the first
To explain how to make ItJJ according to the diagram, Figure 1 shows the state of the pump when it is in operation.The liquid that flows in from the suction port obtains pressure energy in the impeller and flows out from the pump discharge port, but during operation, the liquid flows downward. In response to the axial thrust of the pump, the open type impeller @ face slides into contact with the pump casing wall and rotates. In this state, both end faces of the driving permanent magnet and the driven permanent magnet have an offset of the value e in FIG. 1.

When the operation is stopped and the axial thrust is removed, the deviation in the value of e is reduced by the mutual attractive force of the magnets, and the impeller is held in a substantially floating state within the pump chamber. Therefore, the linear bearings (eg, 26 and 27 in FIG. 2) found in common magnetically coupled pumps are not required at all.

Then, separated from the liquid sent to the discharge port, some of the bearing lubricating liquid passes through the opening in the side wall along arrows 23.23m and 23b and rises into the discharge liquid storage tank. Some of the particles in the liquid collide with the separation disk and are separated.

The opening area of the side wall is determined so that the passage speed of the liquid flow required for bearing lubrication is much slower than the sedimentation speed of the mixed particles. (In the example, l/1 of the settling velocity of gravel particles
The passage speed is 0, and the openings are provided at four locations. ) Particles that enter the discharged liquid storage tank without being separated by the separation disk are separated from the liquid rotating in the tank while sticking to the outer wall of the tank due to the centrifugal force effect caused by the swirling flow. The particles gradually settle down, fall onto the mortar-shaped inclined surface of the separation disk, fall from the circular opening in the center of the semicircular separation disk onto the side wall, and are further carried to the outer periphery by centrifugal force. , and return to the pump chamber through the side wall opening.

Experimental results in which the separation disk was not moved southward showed that the contaminant particles that rise impactively from the opening in the side wall reach the bearing part, and that the rotation in the discharged liquid reservoir tank may be disturbed. :) Effective results could not be obtained due to insufficient centrifugal force effect.

Many variations in the shape of this separation disk can be made without departing from the effectiveness of the invention.

The bearing installed in the center of the discharge liquid reservoir tank is the center of the centrifugal force effect, and only the lubricating liquid from which harmful particles have been removed is sent between the shaft and the bearing and into the pump chamber. It is returned to the rear part of the impeller.

The rotational speed of the liquid in the discharge liquid storage tank is designed to be between 200 and 300 rotations, but a stirring blade is attached to the top of the bearing to help adjust the rotational speed. It's a shame.

For weak slurry mixed liquid, even without this stirring blade, the impeller transmits several revolutions inside the pump chamber, so that a sufficient centrifugal force effect can be achieved on a real network.

By configuring the present invention as described above, it is possible to successfully separate the bearing lubricating liquid from the particle-contaminated liquid, and eliminate the presence of slurry-containing chemical liquid or crystalline particle contamination, which was previously thought to be a problem in magnetic moxibustion bonding. This system has the effect of making it possible to transfer chemical liquids of up to 100%, and as a result of the structure in which the front surface of the open type impeller rotates by sliding in contact with the facing wall of the pump casing, the high-pressure liquid around the impeller periphery can be transferred. This prevents backflow to the low-pressure area at the center of the impeller and prevents slurry particles from accumulating between the gaps, reducing wear on the sliding parts more than expected.

Due to the sliding contact of the Tohomp casing wall, the inflow liquid is delivered from the impeller's suction port (eye area to the outer periphery of the impeller) without leaking, providing a strong suction force.
In addition to the force 1j, disc friction loss and water leakage loss can be reduced, and cylinder efficiency can be obtained as a secondary effect.

The front surface of the open type impeller of the present invention is in contact with the pump casing wall. l! The concept of sliding and rotating can be applied as is to conventional general-purpose magnetic coupling bogs, making maintenance and inspection simple and quick, and at the same time can be expected to have a high static and dynamic ratio.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a similar device for explaining the problems of the prior art. DESCRIPTION OF SYMBOLS 1... Prime mover, 3... Driving permanent magnet, 4... Driven permanent magnet, 5... Shaft, 1... Non-magnetic partition wall, 8
... Side wall, 9... Pump chamber, 10... Discharge failure storage tank, 11... Opening, 12... Separation disk, 13
... Impeller, 14... Bearing, 15... Sliding material,
16...Pump casing wall surface, 24...Pump indoor discharge port, 25...Discharged liquid tank, 26.27...
Thrust bearing. Procedural amendment (voluntary) July 26, 1980 Director General of the Japan Patent Office Kazuo Wakasugi 1. Indication of the case Patent Application No. 111786/1986 2. Name of the invention Transverse axis magnetic coupling pump 3. Relationship with the person making the amendment Patent applicant name Tokyo Koso Co., Ltd. 4 Agent Contents of amendment in column 6 of “Detailed description of the invention” of the specification

Claims (2)

[Claims] (1) Drive permanent magnet on the prime mover side and the covering part inside the pump
In a chamber-axis magnetic coupling bog in which the dynamic permanent magnets are partitioned by non-magnetic partition walls, a side wall is provided to partition the inside of the pump into a Honda chamber and a discharge liquid reservoir, and an opening is provided in this side wall. and providing a separation disk penetrating the pump chamber and the discharged liquid storage tank, covering the opening, and having an open center portion;
Further, a bearing is installed in the center of the discharged liquid reservoir tank,
A chamber-shaft magnetic coupling pump characterized in that particles mixed in the transferred liquid are separated by rotational centrifugal force of the liquid in the separation disk and the discharge liquid storage tank to protect the bearing part. (2) A chamber-shaft magnetic coupling in which the drive permanent magnet on the prime mover side and the driven permanent magnet inside the pump are partitioned by a non-magnetic partition wall In Honda, the inside of the pump is partitioned into a pump chamber and a discharge liquid storage tank. A side wall is provided, an opening is provided in the side wall to allow the pump chamber and the discharged liquid storage tank to pass through the side wall, and a separation disk with an open center portion is provided covering the opening.
Furthermore, all bearings are installed in the center of the discharged liquid storage tank,
Contaminated particles in the transferred liquid are separated by the rotational speed and force of the liquid in the separation disk and the discharge liquid storage tank to protect the bearing part, and the front surface of the open-tied impeller is A bean lees magnetic coupling pong is characterized in that it is configured to rotate by sliding in contact with a wall surface or a sliding material attached to a wall surface.