JP2004190622A - Slurry force-feeding pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slurry force-feeding pump whereby leakage of oil for oil pressure at a seal part of a cylinder tube and a piston rod is surely prevented, maintenance is facilitated, the pump is compact, the installation is facilitated, and strengthening of a frame for installing the slurry pump can be dispensed with. <P>SOLUTION: In this slurry force-feeding pump for pumping slurry by oil pressure, a piston rod having a piston on a center part is arranged inside a hydraulic chamber for pumping the slurry, the hydraulic chamber is divided into first and second hydraulic chambers by the piston, and third and fourth hydraulic chambers for freely sliding the piston rod in the first and the second hydraulic chambers by pressing both ends of the piston rod are arranged adjacently to side surfaces of the first and the second hydraulic chambers. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a slurry pump for pumping various slurries generated in various industries to a filter or the like.
[0002]
[Prior art]
Various sludge generated in various industries, water separation and volume reduction from slurry consisting of residual soil, etc., for example, as a landfill material, as a device to be used as various materials for soil improvement material, for example, Various types of filter machines, such as filter presses, are widely used in various industries.
In the filtration process of these filters, a slurry pump for pumping a slurry, which is a stock solution, to a filter is mainly used mainly for the purpose of shortening the filtration time and improving the filtration efficiency. ing.
[0003]
The prior art of such a pump for slurry pumping is disclosed in, for example, Nippon Steel Technical Report No. 372 (1999), and its outline will be described below with reference to FIGS.
First, FIG. 5 is a schematic diagram of equipment for a slurry filtration process. Slurry 4 generated in various industries is stirred and homogenized in a stirring tank 3, and then, in a slurry pumping pump 2. From the pump chamber 5, for example, it is pressure-fed to a filter press (filter) 1 to be filtered and reduced in volume.
FIG. 4 is a structural diagram of a conventional slurry pump.
In FIG. 4, the pump chamber 5 is equipped with two layers of rubber balls 6, and is constituted by three chambers of an oil chamber 7, an intermediate liquid chamber 8, and a slurry chamber 9 in order. The two-layer rubber ball is expanded and contracted by increasing and decreasing the amount of oil by the operation of the drive cylinder 10 and the metering cylinder 11, and the suction of the slurry into the slurry chamber 9 is performed by the interlocking of this operation and the muddy water valve 20. In addition, the slurry is pressure-fed from the slurry chamber 9 intermittently, and the slurry is pressure-fed to the filter press 1 by repeating suction and pressure feeding of the slurry.
[0004]
However, the structure of the pump for pumping slurry disclosed in the aforementioned Nippon Steel Technical Report No. 372 (1999) has the following problems, and there is still room for improvement as a practical technology.
This will be described in detail with reference to FIG. FIG. 3 shows a sectional structural view of the driving and metering cylinders 10 and 11 in the conventional slurry pumping pump 2. The problem of the prior art in the slurry pumping pump 2 having this structure in pumping slurry to a filter not shown, that is, in pumping slurry from the slurry chamber 9 in the pump chamber 5 will be described.
[0005]
Oil pressure P ₀ supplied from the hydraulic unit shown in FIG. 3, by applying a load P to the cylinder tube 13 _a hydraulic chamber shown in the left side in the drawing of the drive cylinder 10, the fixing bolts of the cylinder tube 13 _a , A load P shown in FIG. The load P, generated moment M ₁ bending the base 12, thereby bending acts on the cylinder rod 15 _a.
On the other hand, the pressure P ₀ of the oil supplied from the hydraulic unit is transmitted to the cylinder rod 15 _b ⇒ piston 14 _b of the piston 14 _a ⇒ cylinder rod 15 _a ⇒ coupling 16⇒ quantitative cylinder 11 of the driving cylinder 10, quantitative cylinder 11 by applying a load P to the cylinder tube 13 _b in the hydraulic pressure shown on the right side in the figure of the fixing bolts of the cylinder tube 13 _b, it is P shown in FIG acts. The load P, generated moment M ₂ bending to the base 12, thereby bending acts on the cylinder rod 15b.
[0006]
Thus, the seal 18 is incomplete and each cylinder tube 13 _a and the piston rod 15 _a and the cylinder tube 13 _b and the piston rod 15 _b by bending of the respective, together with the oil leakage occurs maintenance is very, this If the amount of oil leaks becomes large, the pressure will decrease and the dewatering efficiency in the filter will decrease.
Since the bending moments M ₁ and M ₂ act on the base 12 as described above,
It was necessary to strengthen the frame for installing the pump.
[0007]
[Non-Patent Document 1] Nippon Steel Technical Report No. 372 (1999) P67
[0008]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention solves the problems of the prior art as described above, and in a slurry pumping pump, reliably prevents oil leakage for hydraulic pressure at a seal portion between a cylinder tube and a piston rod to facilitate maintenance. It is another object of the present invention to provide a slurry pump for pumping which is compact and easy to install, and does not require a strong frame for installing the slurry pump.
[0009]
[Means for Solving the Problems]
The present invention has been made as a result of earnest studies to solve the above-mentioned problems, and the gist thereof is as described below in the claims.
(1) A slurry pump for pumping slurry by hydraulic pressure, in which a piston rod having a piston at a central portion is disposed inside a hydraulic chamber for pumping slurry, and the hydraulic chamber is Third and fourth hydraulic pressure chambers are divided into first and second hydraulic chambers, and both ends of the piston rod are pressed to make the piston rods slidable in the first and second hydraulic chambers. A hydraulic pump for slurry pumping, wherein a hydraulic chamber is provided adjacent to side surfaces of the first and second hydraulic chambers.
(2) The pump for pumping slurry according to (1), further comprising a tie rod connecting the first and second hydraulic chambers.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the structure of the slurry pump according to the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view of a pump for pumping slurry according to the present invention, and FIG. 2 is a plan view of FIG.
In FIG. 1, a cylinder tube 13 is mounted on a base 12. A piston rod 15 having a piston 14 at the center is disposed in the hydraulic chamber of the cylinder tube 13, and the hydraulic chamber is divided into a first hydraulic chamber 21 and a second hydraulic chamber 22 by the piston 14. Has been split.
[0011]
Further, on both end sides of the piston rod 15, casings 25 and 26 are provided in connection with the first and second hydraulic chambers 21 and 22, respectively. A fourth hydraulic chamber 24 is formed. Therefore, when the oil from the hydraulic unit is supplied to the third or fourth hydraulic chamber 23.24, the end of the piston rod 15 is pressed by the supplied oil. Thereby, the piston rod 15 having the piston 14 at the central portion can reciprocate integrally and slidably in the first and second hydraulic chambers 21 and 22.
In FIG. 2, reference numeral 17 denotes a tie rod for connecting the first and second hydraulic chambers, respectively. The above is the configuration of the pump for pumping slurry according to the present invention.
[0012]
Next, in the slurry pumping pump of the present invention having the above-described configuration, in the same manner as described in the section of the related art, regarding the slurry pumping from the pump chamber 5 shown in FIG. The details will be described below.
The pressure P ₀ of the oil supplied from the hydraulic unit causes a load P to act on the casing 25 of the third hydraulic chamber 23. On the other hand, the load is transmitted to the casing tube 13 of the second hydraulic chamber 22 with the pressure P ₀ from the piston rod 15 to the piston.
Here, since the casing tube 13 and the casings 25 and 26 have an integral structure, the load P acting on the casing 25 of the third hydraulic chamber 23 and the casing P 13 acting on the casing tube 13 of the second hydraulic chamber 22. The load P is offset. Therefore, no bending occurs in the base 12 described in the above-mentioned prior art. Accordingly, the seal 18 between the piston rod 15 and the cylinder tube 13 is not bent and no oil leakage occurs.
In this way, by integrating the first and second hydraulic chambers 21 and 22 for slurry pumping and the third and fourth hydraulic chambers 23 and 24 for driving the piston rod 15, the pump itself can be used. The pump can be made compact, installation is easy, and the bending moment does not act on the base unlike the conventional case. Therefore, it is not necessary to strengthen the frame on which the pump is installed.
[0013]
In addition, by connecting the first and second hydraulic chambers with tie rods as described above, the force at the time of canceling the two loads P can be held, and the casing tube 13 can be simplified accordingly. It is.
The use of the pump for pumping slurry of the present invention is not limited to the above embodiment, but can be widely used for pumping slurry at high pressure. As an example, for example, there are concrete mud feeding at the time of building a high-rise building and slurry mud sending at the time of oil drilling.
[0014]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, in a slurry pump, a hydraulic pump is reliably prevented from leaking hydraulic pressure in a seal portion between a cylinder tube and a piston rod to facilitate maintenance. Can be provided which does not require the frame to be strengthened, and has the following industrially useful remarkable effects.
1) Because the conventional drive cylinder and metering cylinder are integrated, when the oil is supplied from the hydraulic unit, the base does not bend, and the seal between the piston rod and the cylinder tube bends. There is no oil leakage and maintenance is easy. In addition, the installation area is small, and installation in a narrow portion is easy.
2) Since no bending load acts on the base, it is not necessary to make the base structure tough, and the installation cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a slurry pump according to the present invention.
FIG. 2 shows a plan view of FIG.
FIG. 3 is a sectional structural view of a drive and metering cylinder in a conventional slurry pump.
FIG. 4 is a structural view of a conventional slurry pump.
FIG. 5 shows a schematic diagram of equipment for a conventional slurry filtration process.
[Explanation of symbols]
1: filter press (filter), 2: pump for pumping slurry, 3: stirring tank, 4: slurry, 5: pump chamber, 6: rubber ball, 7: oil chamber, 8: intermediate liquid chamber, 9: slurry chamber , 10: drive cylinder, 11: metering cylinder, 12: base, 3a: cylinder tube, 13b. Cylinder tube, 14a. Piston, 14b: piston, 15a: piston rod, 15b. Piston rod, 16: coupling, 17: tie rod, 18: seal, 19: base, 20: muddy water valve, 21: first hydraulic chamber, 22: second hydraulic chamber, 23: third hydraulic chamber, 24 : Fourth hydraulic chamber, 25: casing, 26: casing

Claims (2)

A slurry pump for pumping slurry by hydraulic pressure, wherein a piston rod having a piston in a central portion is disposed inside a hydraulic chamber for pumping slurry, and the hydraulic chamber is first and second by the piston. And third and fourth hydraulic chambers for pressing both end portions of the piston rod to allow the piston rod to slide in the first and second hydraulic chambers. A slurry pump for pumping, which is provided adjacent to side surfaces of the first and second hydraulic chambers. 2. The pump according to claim 1, further comprising a tie rod connecting the first and second hydraulic chambers.

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