JP3411245B2 - Slurry transfer pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slurry transfer pump such as a magnet pump for transferring a gold plating solution.

[0002]

2. Description of the Related Art A magnet pump has been known as a slurry transfer pump. In this type of magnet pump, by rotating an impeller inside a pump chamber formed by a casing, a transfer fluid is introduced into the pump chamber through a suction port formed in the casing and discharged from a discharge port. In the case of the bearing rotation type, a support shaft is provided so as to project inside the pump chamber, a cylindrical bearing is mounted on the impeller, and the impeller is rotatably supported by the support shaft via the bearing. The impeller keeps the inside of the pump chamber in a closed space, and thus is given a rotational driving force by magnetic coupling from the outside of the pump chamber. In this type of magnet pump, as a forced cooling means between the bearing and the support shaft, a spiral groove is formed on the inner peripheral surface of the bearing, and the transfer fluid is circulated in the spiral groove.

[0003]

In the above-mentioned conventional magnet pump, if the transfer fluid is a simple liquid, there is no particular problem, but the transfer fluid contains insoluble metal particles in a liquid such as a gold plating solution. When it is a slurry, the following problems occur. That is, when the plating solution is transferred by the conventional magnet pump, the metal particles precipitated from the plating solution are
It is pressed against the shaft by the bearing and adheres to the shaft. The attached fine metal particles gradually grow as the pump operates,
Finally, the gap between the bearing and the shaft is set to zero and the pump is stopped. Therefore, in the conventional slurry transfer pump,
There is a problem that the maintenance cost is high because the pump needs to be disassembled and cleaned periodically in a short time, and a large amount of slurry such as an expensive gold plating solution is wasted during disassembly.

The present invention has been made in view of the above problems, and effectively prevents solid particles contained in the slurry from adhering to the shaft during operation, thereby improving the life of the pump and reducing the maintenance cost. It is an object of the present invention to provide a slurry transfer pump that can reduce the amount.

[0005]

A first slurry transfer pump according to the present invention has a casing in which a pump chamber is formed, a suction port and a discharge port for a transfer fluid are provided, and the inside of the pump chamber. A support shaft protrudingly provided on the support shaft, and a rotating body rotatably supported on the support shaft via a cylindrical bearing,
A rotary drive means for rotationally driving the rotary body, and by rotating the rotary body by the rotary drive means, a slurry containing solid particles in a liquid as a transfer fluid is introduced into the pump chamber from the suction port. In the slurry transfer pump that is introduced and discharged from the discharge port, the bearing has a spiral groove for circulating the transfer fluid and cooling the bearing on an inner peripheral surface facing the outer peripheral surface of the support shaft. ,
A vertical groove extending in the axial direction of the support shaft is formed so as to cross the spiral groove.

According to the first slurry transfer pump of the present invention, in addition to the spiral groove, the vertical groove extending in the axial direction is formed so as to cross the spiral groove on the inner peripheral surface of the bearing.
The vertical groove functions to surely scrape the metal particles attached to the surface of the support shaft before growing. The spiral groove is inferior in scraping ability because it comes into contact with the metal particles at an angle, but the vertical groove of the present invention is in contact with the metal particles perpendicularly, and therefore has high scraping ability. Then, the scraped metal particles are transferred to the outside through the gap between the bearing and the support shaft via the spiral groove and removed. Further, in the case of the conventional bearing having only the spiral groove, when the metal particles grow in a part of the spiral groove, the metal particles are clogged and the metal particles grow more and more, and at the same time, the transfer fluid does not circulate in the spiral groove, so that heat is generated. According to the present invention, since the spiral groove of the bearing is divided by the vertical groove, it is possible to effectively prevent the spiral groove from being clogged with metal particles, and to prevent lubrication. The property is also improved.

The second slurry transfer pump of the present invention is
A casing having a pump chamber formed therein and having a suction port and a discharge port for the transfer fluid, a cylindrical bearing provided inside the pump chamber, and an inner peripheral surface of the bearing via a rotary shaft. It has a rotatably supported rotator and a rotation drive means for rotatably driving the rotator, and by rotating the rotator by the rotation drive means, a slurry containing solid particles in a liquid as a transfer fluid In the slurry transfer pump which is introduced from the suction port into the pump chamber and discharged from the discharge port, the rotating shaft circulates the transfer fluid on an outer peripheral surface facing the inner peripheral surface of the bearing. It is characterized in that a spiral groove for cooling the bearing and a vertical groove extending in the axial direction of the rotary shaft are formed so as to cross the spiral groove.

Even in the fixed bearing type such as the second slurry transfer pump of the present invention, the same function and effect as described above can be obtained by forming the spiral groove and the vertical groove on the rotary shaft side. You can

The bearing normally rotates by being pressed in a fixed direction due to the pressure balance of the pump. Therefore, the clearance between the shaft and the bearing decreases as the position of contact between the shaft and the bearing is approached. If the metal particles are larger than the clearance, the metal particles will be pressed against the shaft, making the pump unable to rotate. Therefore, by increasing the difference d between the bearing inner diameter and the shaft diameter as compared with the conventional pump, it is possible to reduce the chances that the metal particles adhere to the shaft. The gap d is
Since the smaller the vibration of the pump is, the conventional value is 0.04.
Although it has been set to about mm, it is set to, for example, 0.1 mm or more, preferably 0.1 to 0.5 mm in order to reduce the chances that the metal particles adhere to the shaft. Further, as the material of the bearing, a non-adhesive material, for example, a fluorine-based resin such as PTFE (polytetrafluoroethylene) or ceramics is suitable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a main part of a magnet pump according to an embodiment of the present invention. Front casing 1 and rear casing 2
A suction port 4 for the transfer fluid is formed on the front surface of the pump chamber 3 formed by and, and a discharge port 5 for the transfer fluid is formed on the upper surface thereof. A rotating body 6 is housed inside the pump chamber 3. The rotating body 6 is rotatably supported by a support shaft 7 projecting from the center of the rear casing 2 toward the pump chamber. The rotating body 6 has a cylindrical bearing 11 that slidably contacts the outer periphery of the support shaft 7, a magnet can 13 that is formed on the outer periphery of the bearing 11 and that has a ring-shaped driven magnet 12 arranged on the outer periphery thereof. An impeller 14 mounted on the front surface of the magnet can 13 to introduce the transfer fluid into the pump chamber 3 from the suction port 4 by rotation and discharge it from the discharge port 5, and an impeller 14 mounted on the back surface of the impeller 14 during idle operation The thrust bearing 15 is in pinpoint contact with the tip of the support shaft 7, and the mouth ring 16 is mounted on the front surface of the impeller 14. Further, a liner ring 17 that is in sliding contact when the impeller 14 moves to the front surface is attached to a portion of the front casing 1 that faces the mouth ring 16 on the front surface of the impeller 14.

On the other hand, at a position facing the driven magnet 12 of the magnet can 13 via the rear casing 2, the ring-shaped drive magnet 22 of the drive rotor 21 constituting the rotation drive means is magnetically coupled to the driven magnet 12. It is arranged. The drive rotor 21 is driven by a motor (not shown) via a drive shaft 23. The drive rotor 21 is separated from the pump chamber 3 and is housed in the space between the rear casing 2 and the drive body casing 24.

The bearing 11 is made of a non-adhesive material such as PTFE, and as shown in FIG. 2, a spiral groove 31 and a vertical groove 32 axially traversing the spiral groove 31 are formed on the inner surface thereof and the outer peripheral surface thereof. A notch 33 for positioning is formed on the.

According to this magnet pump, when the motor (not shown) rotationally drives the drive rotor 21 via the rotary shaft 23 to rotate the drive magnet 22, the driven magnet 12 magnetically coupled to the drive magnet 22 also rotates. This allows
The bearing 11 slides around the support shaft 7, the impeller 14 rotates, and the transfer fluid is introduced from the suction port 4 into the pump chamber 3. Most of the introduced transfer fluid is discharged to the outside through the discharge port 5, but a part of it is passed from the rear portion of the impeller 14 through the bottom portion of the rear casing 2 to the spiral groove 3 of the bearing 11.
1, is moved forward in the spiral groove 31 to reach the back surface of the impeller 14, is recirculated to the pump chamber 3 through the recirculation hole 18 penetrating the front and rear of the impeller 14, and is discharged from the discharge port 5. The bearing 11 is cooled by the circulation of the transfer fluid.

By the way, when a slurry containing fine metal particles such as gold plating liquid and sludge is transferred, the metal particles are pressed and attached to the support shaft 7 while passing through the spiral groove 31 of the bearing 11. The vertical groove 32 has a function of scraping off the metal particles attached to the surface of the support shaft 7 before they grow. The scraped metal particles are discharged to the outside through the spiral groove 31.

FIG. 3 is a view showing the maximum gap d between the support shaft 7 and the bearing 11. Normally, in the case of the magnet pump as shown in FIG. 1, the bearing 11 rotates while being pressed against the support shaft 7 in a certain direction due to the imbalance of the pressure inside the pump chamber 3. When the gap d between the support shaft 7 and the bearing 11 is smaller than the metal grain, the metal grain in the spiral groove 31 is pressure-bonded to the support shaft 7 and adheres to the support shaft 7, but the gap d is the metal grain. If it is larger than this, there is no such pressure bonding, and the spiral groove 31 smoothly flows. Therefore, it is preferable that the gap d be as wide as possible within the range that does not affect the rotation operation. In the case of a pump for transferring the plating solution, the grain size of the deposited metal is φ0.1 mm or less, so the gap d is preferably 0.1 mm or more. However, if the gap d is too large, the stability of the rotation operation cannot be obtained. Therefore, when the two are balanced, the gap d becomes
0.1 to 0.5 mm is desirable.

Although the bearing 11 is rotated in the above embodiment, the present invention can be applied to a pump of a type in which the bearing is fixed and the shaft is rotated. Figure 4
It is a figure which shows this Example, the same code | symbol is attached | subjected to the same part as FIG. 1, and the overlapping description is abbreviate | omitted.

In this embodiment, an impeller 41 serving as a rotating body 40 and a magnet can 42 are connected via a rotary shaft 43. The rotating shaft 43 is rotatably supported by a cylindrical bearing 47 mounted in a center hole of a split plate 46 fixed by a front casing 44 and a rear casing 45. The rotating shaft 43 has a central shaft 48,
It consists of a cylindrical sleeve 49 attached to its outer periphery,
The outer peripheral surface of the sleeve 49 is in sliding contact with the inner peripheral surface of the bearing 47.
In the case of the present embodiment, as shown in FIG. 5, a spiral groove 51 and a vertical groove 52 are formed on the outer peripheral surface of the sleeve 49.

In this embodiment, the transfer fluid introduced from the suction port 53 into the pump chamber 54 moves to the magnet can 42 side through the reflux hole 55 of the split plate 46 and the spiral groove 51 formed in the sleeve 49. Through the process of moving from the back to the front between the sleeve 49 and the bearing 47 via the bearing 4
7 is cooled. The transfer fluid that has moved to the back side of the impeller 41 returns to the pump chamber 54 via the return hole 56 formed in the impeller 41, and is discharged from the discharge port 57.

Also in this embodiment, the same effect as that of the previous embodiment can be obtained. Even in this case, it is desirable that the bearing 47 and the sleeve 49 use a non-adhesive material, for example, a fluorine-based resin such as PTFE or ceramics.

[0020]

As described above, according to the present invention, in addition to the spiral groove on the inner peripheral surface of the bearing or the outer peripheral surface of the shaft, the vertical groove extending in the axial direction is formed so as to cross the spiral groove. Therefore, the vertical groove functions to surely scrape the metal particles attached to the surface of the shaft or the inner surface of the bearing before the growth. Therefore, the maintenance period can be extended and the maintenance cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a magnet pump according to an embodiment of the present invention.

2A and 2B are a sectional view and a front view showing a bearing of the embodiment.

FIG. 3 is a diagram for explaining a clearance ratio between the bearing and a support shaft.

FIG. 4 is a sectional view showing a main part of a magnet pump according to another embodiment of the present invention.

FIG. 5 is a side view of a sleeve of the magnet pump.

[Explanation of symbols]

1, 44 ... Front casing, 2, 45 ... Rear casing, 3, 54 ... Pump chamber, 4, 53 ... Suction port, 5, 5
7 ... Discharge port, 6, 40 ... Rotating body, 7 ... Support shaft, 11, 4
7 ... Bearing, 13, 42 ... Magnet can, 14, 41
... impeller, 21 ... driving rotor, 31,51 ... spiral groove,
32, 52 ... Vertical groove, 49 ... Sleeve.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-235392 (JP, A) JP-A-7-12084 (JP, A) JP-A-62-124316 (JP, A) Actual development Sho-64- 4919 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04D 1/00-29/70

Claims (4)

(57) [Claims] 1. A casing having a pump chamber formed therein and having a suction port and a discharge port for a transfer fluid, a support shaft projecting inside the pump chamber, and a cylindrical bearing on the support shaft. A rotary member rotatably supported via a rotary drive means for rotating the rotary body, and by rotating the rotary body by the rotary drive means, solid particles are added to a liquid as a transfer fluid. The slurry containing
In the slurry transfer pump which is introduced into the pump chamber from the suction port and discharged from the discharge port, the bearing is provided on an inner peripheral surface facing the outer peripheral surface of the support shaft,
A slurry comprising: a spiral groove for circulating the transfer fluid to cool the bearing; and a vertical groove extending in the axial direction of the support shaft so as to cross the spiral groove. Transfer pump. 2. A casing having a pump chamber formed therein and having a suction port and a discharge port for a transfer fluid, a cylindrical bearing provided inside the pump chamber, and an inner peripheral surface of the bearing. It has a rotating body rotatably supported via a rotating shaft, and a rotation drive means for rotationally driving this rotating body, and by rotating the rotating body by the rotation drive means, it is solidified into a liquid as a transfer fluid. A slurry containing particles,
In a slurry transfer pump that is introduced from the suction port into the pump chamber and discharged from the discharge port, the rotating shaft is on an outer peripheral surface facing the inner peripheral surface of the bearing,
A slurry comprising: a spiral groove for circulating the transfer fluid to cool the bearing; and a vertical groove extending across the spiral groove in the axial direction of the rotary shaft. Transfer pump. 3. The slurry transfer pump according to claim 1, wherein the gap between the support shaft and the bearing is set to 0.1 mm or more. 4. The slurry transfer pump according to claim 1, wherein the bearing is made of a non-adhesive material.