JPH07101036B2 - Rotary discharge pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a novel rotary discharge pump for efficiently collecting slurry, especially sludge accumulated on the bottom of a bay or river.

[Conventional technology]

In general, sludge, which is a slurry-like sediment deposited on the bottom of the bay, has various adverse effects on the surrounding environment, such as offensive odors and the death of farmed fish due to the generation of gas, and the pollution of seawater. It is strongly desired to process. In addition, at the time of disposal, it is necessary to dry the collected sludge to some extent and then transport it by truck, or prepare a special container for storing the sludge, but in any case, the water content of the sludge can be adjusted. It is preferable to make it as small as possible.

By the way, conventionally, when collecting sludge accumulated on the bottom of a bay or the like, it was sucked together with water by a spiral type dredge pump or sucked by a concrete pump and sent to the subsequent processing stage.

[Problems to be Solved by the Invention]

Among those mentioned in the previous section, the dredge pump is structurally
Suction performance is demonstrated for sludge containing a large amount of water with a water content of 90% or more. For this reason, drying the sludge collected by this pump requires a long time and a vast site according to the sun, and a dryer requires a lot of energy and cost, resulting in extremely inefficient treatment work. Was forced to.

In addition, when using a concrete pump, since the structure is a piston type, the equipment is large, but the amount of transportation per time is small, the energy and extraction costs are high, and the piston that is a metal part There was a problem that the sliding parts such as cylinders were worn quickly and the maintenance cost was high.

Therefore, it is possible to adopt a vane pump. According to this vane pump, a slurry having a low water content and a high viscosity can be continuously and easily discharged, energy and cost can be saved, and the pump itself is compact and has a simple structure. In that case, in a vane pump of the type in which the movement of the vanes is regulated by a cam mechanism, the slurry enters the cam mechanism and causes pump damage, which is disclosed in Japanese Utility Model Publication No. Sho 62-95188 and Japanese Utility Model Publication No. 56-10954. If the pump is used, the vane tip is pressed against the inner peripheral surface of the casing by applying a fluid pressure to the base end of the vane, so it can be said that the problem caused by the slurry entrapment is unlikely to occur. Moreover, in the vane pump using the cam mechanism, when the vane tip and the casing inner peripheral surface are worn, the gap between the vane tip and the casing inner peripheral surface increases and the pump performance deteriorates. In the vane pump that applies fluid pressure to the vane base end described above, the pressing force acts on the vane regardless of the position of the vane, so the tip of the vane always contacts the inner peripheral surface of the casing reliably and pump performance is maintained for a long time. It

However, in the above-mentioned conventional vane pump, when a fluid containing water is used as the pressurized fluid, the pressurized fluid passes between the guide grooves for accommodating the vanes and / or between the rotor and the casing due to its structure. It leaks and mixes into the slurry in the pump chamber. In this case, the water content of the pressurized fluid increases the water content of the slurry, and the initial purposes such as energy saving and cost saving cannot be sufficiently achieved. In particular, when mortar, for example, is discharged as a slurry, if the water in the pressurized fluid mixes with the mortar in the pump chamber, the quality of the mortar deteriorates. On the other hand, in the technique described in Japanese Utility Model Publication No. 56-10954, the seal member 13A is provided to prevent the discharged fluid from entering the inside, which prevents the pressurized fluid from leaking. However, in the structure using the seal member 13A as described above, the seal member 13A is bitten by the vane 11, so that leakage cannot be prevented for a long period of time, and leakage between the rotor and the casing is completely prevented. I can't.

Also, the vanes move in the rotor radial direction as the rotor rotates, but the vanes swing during this movement, and the vane tips do not uniformly contact the inner peripheral surface of the casing along the rotor axial direction. There is a problem that the initial performance of the pump cannot be maintained due to wear.

The present invention has been made paying attention to such a point,
The purpose thereof is to devise a structure for assembling the vane with respect to the rotor so that the tip of the vane is always in good contact with the inner peripheral surface of the casing and the leakage of the pressurized fluid is surely prevented.

[Means for Solving the Problems]

In order to achieve the above object, the rotary discharge pump of the present invention is intended for a rotary discharge pump used for discharging a slurry. On the other hand, a casing having an inlet on one side and an outlet on the other side, a rotor eccentric to the center of the casing and rotating in contact with the inner peripheral surface of the casing, and the rotor are provided radially. A plurality of guide grooves that are slidably housed in the plurality of guide grooves, and a pressurization chamber into which a pressurized fluid containing water is introduced into the rotor; Guide holes respectively connected to the guide grooves are provided, and a piston portion slidably fitted in the guide hole is fixedly provided at the base end of the vane, the guide hole is formed as a circular hole, and the piston portion is formed. It is configured to be formed into a solid columnar shape.

[Action]

In the rotary discharge pump configured as described above, when the rotor rotates, the vanes housed in the respective guide grooves also rotate. At the same time, if the pressurized fluid is injected into the pressure chamber to increase the internal pressure, the vane receives the fluid pressure at its piston portion and is urged toward the outside of the rotor, and the vane is in contact with the inner peripheral surface of the casing. Rotate. Further, since the rotor is eccentric with the center of the casing, the pump chamber is partitioned and formed in the casing, but the pressure inside the pump chamber is negative pressure on the suction port side and positive pressure on the discharge port side, and the slurry is continuously sucked in. It has the effect of pushing it out.

In that case, the piston portion is fixedly provided on the vane, and the piston portion is fitted into the guide, so that the vane does not swing when the vane moves in the rotor radial direction. Therefore, the tip of the vane and the inner surface of the casing are uniformly worn, and the initial performance of the pump does not deteriorate.

Further, since the guide hole is formed as a circular hole and the piston portion of the vane is formed as a solid columnar shape, these fitting portions can be machined with high machining accuracy. Liquid tightness of the pressure chamber is ensured between the holes. Moreover, since the inner end surface of the piston portion is circular, a bowl-shaped packing or the like having a high sealing property can be attached thereto, and at that time, the liquid tightness of the pressurizing chamber described above is further improved.

〔Example〕

The present invention will be described in more detail below with reference to an embodiment shown in the drawings. 1 is a cast steel pump body, 2 is a hydraulic motor, and 3 is driven by the hydraulic motor 1 via intermediate gears 4a and 4b. The shaft 5, which is a rotor, is housed in the casing 6, has the same width as the casing 6, is connected to the shaft 3, and is supported by the auxiliary shaft 7 to rotate. A plurality of axially extending guide grooves 9 are radially provided in the rotor 5, and a pressure chamber 12 is provided inside the rotor. Reference numeral 8 is a guide hole that extends radially from the pressure chamber 12 and is connected to the guide groove 9. Reference numeral 10 is a block fixed to the rotor 5 at regular intervals to form the guide groove 9. The rotor 5 has its center position set so as to rotate only in contact with the upper inner peripheral surface 6a of the casing. That is, as compared with the center of the casing 6, the center of the rotor 5 is eccentric to the pump upper side.

Reference numeral 11 denotes a vane slidably accommodated in each of the guide grooves 9, the length of which is substantially equal to the depth of the guide groove 9. A piston portion 11c slidably fitted in the guide hole 8 is integrally fixed to the base end 1a of the vane 11.

The guide hole 8 is formed in a circular hole, and the piston portion 11c of the vane 11 is formed in a solid columnar shape.

The pressurizing chamber 12 is configured to be able to pressurize and supply a fluid containing water through a valve 13 from a through hole 7a penetrating the center of the sub shaft 7. Further, a rotor seal is applied to the mounting portion of the valve 13 to prevent fluid leakage.

The surface of the vane 11 is coated with urethane rubber, and at least the inner peripheral surfaces 6a and 6b of the casing and the rotor block 10 abutting on the inner peripheral surfaces 6a and 6b are made of wear-resistant metal such as high chrome cast iron. It is a thing.

Further, as shown in FIG. 2, the casing 6 has an eccentric arrangement in which the rotor 5 is in contact with only the upper inner peripheral surface 6a, so that a pump chamber 14 having the same width is formed below the rotor 5.
The pump chamber 14 is divided by vanes 11 protruding from the rotor 5, and an intake port 15 and a discharge port 16 are provided on both sides of the vane 11.

Next, the operation of the rotary discharge pump of the above embodiment will be described. First, when the hydraulic motor 2 is driven, the intermediate gear 4a
The shaft 3 rotates via 4b, and the rotor 5 also rotates in conjunction with this. Then, the pressure chamber 12 of the rotor 5
When a pressurized fluid containing water is supplied from 13, fluid pressure is applied to the piston portion 11c of the vane 11 in the guide hole 8, so that the vane 11 is urged outward, and the tip 11b of the vane 11 is urged outward.
It rotates while contacting the inner peripheral surfaces 6a and 6b. When the vane 11 rotates in this way, 14 of the divided pump chambers 14 are
Since A is in a negative pressure state, when it communicates with the suction port 15, it starts to suck the slurry at the suction port and reaches the pump chamber 14B. Next, since the volume of the chamber gradually decreases when reaching the pump chamber 14C, the slurry begins to be pushed out to the discharge port 16, and the discharge is completed by closing the communication with the discharge port 16 in the pump chamber 14D. Therefore, by continuously performing this operation, the slurry can be continuously discharged.

In that case, since the piston portion 11c is integrally fixed to the vane 11 and the piston portion 11c is fitted in the guide hole 8, when the vane 11 moves in the rotor radial direction, the vane 11 moves in the rotor axial direction. Therefore, the tip of the vane 11 uniformly and smoothly contacts the inner peripheral surface of the casing along the rotor axial direction. Therefore, uneven wear does not occur,
The initial performance of the pump can be maintained for a long time.

Further, since the guide hole 8 is formed as a circular hole and the piston portion 11c of the vane 11 is formed as a solid columnar shape, it is possible to process these mixed portions with high processing accuracy. As a result, the pressurizing chamber 1 is provided between the piston portion 11c and the guide hole 8.
Liquid tightness of 2 is secured. Moreover, since the inner end surface of the piston portion 11c is circular, a bowl-shaped packing or the like having a high sealing property can be mounted here, and at that time, the liquid tightness of the pressurizing chamber 12 is further improved without the packing being gnawed. To do. Therefore, since the pressurized fluid does not leak to the pump chamber and the pressurized fluid does not mix with the slurry in the pump chamber, sludge with a low water content can be discharged with a low water content, which saves energy.
Cost savings can be achieved. In particular, when mortar or the like is discharged as a slurry, it is possible to reliably avoid mixing of water in the pressurized fluid into the mortar, and the mortar and the like can be transported without causing quality deterioration.

It should be noted that the pump chamber 14D should be as free of residual slurry as possible, and for that reason the end portion 16 of the discharge port is
It is preferable to bring a closer to the pump chamber 14A side, but in any case, a small amount of residual slurry cannot be avoided. Incidentally, there is no problem when the slurry is only ultrafine powder particles, but normally, since the slurry contains hard particles such as silicon particles, scratches are generated on the contact surface between the casing 6 and the vanes 11. However, in this embodiment, since the vane 11 is coated with urethane rubber, this can be prevented, and the residual slurry adhering to the front surface of the vane 11 at the terminal end portion 16a of the discharge port will not contact the vane and the edge. By contacting the formed end portion, it is reliably ejected toward the ejection port 16 side. Further, since the inner peripheral surface of the casing 6 and the rotor block 10 are made of high chrome cast iron, they are hard to wear and prevent leakage of the slurry.

Since urethane rubber is a soft material, when iron pieces or wire scraps are mixed in the slurry, urethane rubber or coated vanes are easily cut. Therefore, when the slurry has such a property, the urethane rubber coating is omitted and the vane is made of a metal having high wear resistance such as high chromium steel.

Explaining the specific example of the product of the present invention, when the diameter of the pump chamber 14 is 70 cm, the thickness is 20 cm, and the rotation speed of the rotor 5 is 55 rpm, about 150 m ³ of slurry can be discharged in one hour. did it. Further, the water content of this slurry was about 60%, and it was possible to discharge the slurry having an extremely high solid content.

The number of vanes 11 is not limited to six, and may be appropriately changed depending on the performance of the pump and the properties of the slurry.
Along with this, the number of storage units for the vanes 11 was increased or decreased, and
The internal pressure of 12 may be adjusted appropriately.

In addition, the vane 11 is not limited to the above-described shape in which the tip 11b has an edge shape, and the tip may have a semicircular tip for discharging sand and gravel as shown in FIG. It can be appropriately changed according to the property of.

〔The invention's effect〕

The rotary discharge pump of the present invention has a structure in which a vane is housed in a rotor that eccentrically rotates in a casing, and a slurry such as sludge is discharged by the rotation of the vane, and a pressurized fluid containing water is introduced into the rotor. And a guide hole extending radially from the pressurizing chamber and connected to the guide groove of the vane, and a piston portion slidably fitted in the guide hole is fixed to the base end of the vane. And then set
Since the guide hole is formed into a circular hole and the piston portion is formed into a solid columnar shape, it is possible to effectively prevent the pressurized fluid from being mixed into the slurry in the pump chamber, so that the slurry having a low water content has a low water content. It can be easily discharged continuously at a low temperature, the subsequent drying process of the slurry can be performed easily and inexpensively, the recovery rate of the solid content of the slurry can be greatly improved, and energy and cost can be saved. Can be realized. Moreover, since the piston portion is fixedly provided in the vane, and the piston portion is fitted in the guide hole, the vane does not swing when the vane moves in the radial direction of the rotor. It makes uniform and smooth contact with the surface, uneven wear does not occur, and the initial performance of the pump can be maintained for a long period of time.

Further, since no cam mechanism or the like is used, it is difficult for problems due to the slurry being caught. Moreover, since the pressing force acts on the vane regardless of the position of the vane, even if the tip of the vane and the inner peripheral surface of the casing are worn, the tip of the vane always contacts the inner peripheral surface of the casing, and the pump performance can be maintained for a long time. .

Furthermore, the contact pressure between the tip of the vane and the inner surface of the casing can be appropriately changed by increasing or decreasing the inner pressure of the pressurizing chamber, so that the discharge capacity can be made variable according to the property of the slurry. By properly adjusting the contact pressure, abrasion of the inner peripheral surface of the casing is also suppressed.

Furthermore, the pump itself can be made extremely compact without increasing the size of the pump itself, unlike the conventional concrete pump.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary discharge pump of the present invention, FIG. 2 is a horizontal sectional view showing an internal structure of a pump chamber, and FIG. 3 is a vertical sectional view showing another shape of a vane. In the drawing, 5 ... Rotor, 6 ... Casing, 6a ... Upper inner peripheral surface, 6b ... Lower inner peripheral surface, 8 ... Guide hole, 9 ... Guide groove, 11 ... Vane, 11a. Base end, 11b ... Tip, 11c
...... Piston part, 12 ...... Pressurizing chamber, 15 ...... Suction port, 16 ......
Outlet.

Claims (1)

[Claims] 1. A rotary discharge pump used for discharging slurry, comprising a suction port 15 on one side and a discharge port 16 on the other side.
And a rotor 5 that is eccentric to the center of the casing 6 and rotates in contact with the inner peripheral surface 6a of the casing 6, and is slidable in a plurality of guide grooves 9 radially provided in the rotor 5. And a pressurizing chamber 12 into which a pressurized fluid containing water is introduced into the rotor 5, and a vane 11 extending radially from the pressurizing chamber 12 and connected to the guide groove 9 respectively. A guide hole 8 is provided, and a piston portion 11c slidably fitted into the guide hole 8 is fixedly provided at a base end 11a of the vane 11, the guide hole 8 is formed as a circular hole, and the piston portion 11c is formed. A rotary discharge pump characterized by having a solid cylindrical shape.