JP2007126276A5 - - Google Patents

Description

In order to achieve the above-described object, the dewatering cake pressure feeding device provided with the uniaxial eccentric screw pump according to the present invention is a lower part while stirring the dewatering cake put into the feeder casing (with the upper end opened) through the stirring blade. Dehydration equipped with a single-shaft eccentric screw pump that is pushed into the pump casing, pushed into the suction port of the front single-shaft eccentric screw pump by a screw rod in the pump casing, and transported to a predetermined place by the single-shaft eccentric screw pump in cakes pumping device, the place rotary drive shaft within the feeder casing both ends rotatably supported by bearings, the two or more sets of stirring blades on the rotary drive shaft, spacing in the axial direction of the rotary drive shaft and is attached by shifting the rotational direction of the phase opened, the semi-radial tip of the stirring blade of each set The rolling three or more stirring protruding on both sides in the axial direction of the drive shaft, provided at equal intervals in the circumferential direction, between the rotary drive shaft and the respective stirring section connected by the supporting portion having an opening It is characterized by being configured.

According to the dewatering cake pressure-feed device provided with the uniaxial eccentric screw pump according to claim 1 having the above-described configuration, the rotary drive shaft for supporting and rotating the stirring blade has a double-end support structure, so that the water content is 70%. It does not have insufficient strength for transporting the following highly viscous dehydrated cakes and fluids of the same degree of viscosity, and is highly durable. Stirring blades equipped with at least 6 stirring sections intermittently hit the dehydrated cake. Since the viscosity of the dehydrated cake is reduced, the load on the dehydrated cake acts almost evenly, preventing it from acting as a so-called impact load. Since it is made to approach, bridging is unlikely to occur and the number of stirring blades in each group is increased to 3 or more, and an opening is provided in the support part of the stirring part, so the stirring force is strong. Okuryou greatly increased as compared with the conventional apparatus, it can be optimized axial torque, allowed to maximize the effect pushing with minimal torque can feeder casing compact.
According to a second aspect of the present invention, the agitator extends long in the axial direction of the rotary drive shaft of the pump casing (the total length of two or more sets of agitators is the axial direction of the rotary drive shaft of the pump casing). The structure can be made shorter than the full length but longer than half the length) .

The dewatering cake pressure feeding device according to claim 3, wherein the plate valve is moved along the bottom surface of the feeder casing in a direction perpendicular to the axial direction of the rotary drive shaft at a boundary position between the feeder casing and the pump casing. It is provided to open and close while entering and exiting.
In addition, as described in claim 4, the plate valve is housed in the feeder casing so as not to protrude to the outside, and the valve body of the plate valve is in an open state and a tip portion thereof is in contact with the pump casing. It protrudes slightly into the push-in opening, and a part of the push-in opening can be covered .

According to the dewatering cake pressure feeding device according to claim 3 , by blocking (closing) the boundary position between the pump casing and the feeder casing at the time of inspection, disassembly and assembly of the uniaxial eccentric screw pump and the pump casing by the plate valve, Scraping out the sludge in the feeder casing is not necessary. In addition, since the plate valve is provided so as to be opened and closed in a direction perpendicular to the axial direction of the rotational drive shaft, the time required for opening and closing can be shortened. Further videos plate valve into the feeder casing, since the structure does not protrude to the outside, which reduces the sealing portion than the conventional, since shorter, improved sealing properties, thereby also cost. Furthermore, the dehydrated cake in the feeder casing, etc., since as Oshikomeru in the pump casing in a state where the rotational direction of the pushing stirred at port blade was partially shielding the pump casing, scattering of dehydrated cake received in screw Can be reliably pumped into the pump casing, increasing the capacity of the dewatered cake pushed into the pump screw portion and improving the pushing force. In addition, since the stirring blades are divided, interference with the operation part (for example, a feed screw part) for taking in and out the plate valve can be avoided, so that the distance between the stirring part of the stirring blades and the screw blades of the pump screw part can be shortened. , Can keep the pushing force high. Therefore, the rotation of the screw rod increases the capacity to push the dewatered cake into the suction port of the front uniaxial eccentric screw pump, increasing the volumetric efficiency of the pump and greatly improving the conveying efficiency of the screw rod compared to conventional devices. To do.

The dewatering cake pressure feeding device according to claim 5, wherein a stator of a uniaxial eccentric screw pump is connected to the front surface of the pump casing, and a rear end of the rotor in the stator is disposed on a rear wall surface of the pump casing. One end of a shaft or a reduction shaft is connected via the screw rod in the pump casing with a universal joint interposed between the rotor and the screw rod, and at least one of the universal joint and the adjacent rotor end surroundings, characterized by the TURMERIC covered by sleeve-like cover attached to exert and kneading function integrally with the outer peripheral surface of the screw. Here, “the screw is attached so as to exhibit the kneading function” means that the universal joint covered with the sleeve-like cover provided with the screw is housed in the pressure chamber 51A (see FIG. 1). To do. In the pressure chamber, the pressure is increased by the rotation of the screw rod, and when the screw of the universal joint rotates under this condition, the dehydrated cake is kneaded and the viscosity is reduced.
In addition, as described in claim 6 , the pump casing can be separated forward and backward at the position of the universal joint and can be connected to be separable by a one-touch joint.

According to the dewatering cake pressure feeding device of the sixth aspect , since the Victory Joint (registered trademark) which is a one-touch joint is used for connecting the pump casing, it is possible to disassemble by removing only two bolts, and separation. Later, by pulling out the stator while rotating it relative to the rotor, the pump casing can be easily separated and inspected, the stator and rotor can be disassembled, and the rotor can be replaced. Further , according to the dewatering cake pressure feeding device according to claim 5 , a screwed sleeve is attached to at least one of the circumference of the universal joint connecting the screw rod and the rotor or the circumference of the end of the rotor adjacent to the universal joint, Since the pushing force acting on the dewatering cake etc. by the rotation of the screw rod works toward the inside of the stator from the suction port of the front uniaxial eccentric pump, the pushing force from the pump casing increases and is pushed smoothly into the stator. The volumetric efficiency of the pump is greatly increased (about 1.5 times that of the conventional pump), and the dewatered cake is transported in a compacted state, improving the transport capacity. Since the pushing force is increased, the pressure in the pressure chamber is improved as compared with the conventional one, and the screw stirs the dehydrated cake under this condition, so that the viscosity is lowered and the volumetric efficiency is increased. Moreover, the conveyance resistance in the delivery pipe is lowered.

A rotational drive shaft 24 is disposed through the center position of both side walls 23 along the longitudinal direction in the feeder casing 21, and both ends thereof are rotatably supported by bearings 25, and a speed reducer is provided at one end of the rotational drive shaft 24. The electric motor 26 is connected via (not shown). On the rotary drive shaft 24, two sets of three-blade type stirring blades 27 in this example are spaced apart in the longitudinal direction and their phases are shifted by 60 ° in this example. Each set of stirring blades 27 has a circular pipe (circular pipe) with three or more ends closed projecting in the longitudinal direction (that is, the axial direction of the rotary drive shaft 24) on the radial front end (outer end). The stirrer 28 is provided at equal intervals in the circumferential direction. The length 2s, which is the sum of the lengths s of the two sets of stirring sections 28, satisfies the length L of the feeder casing 21 in the longitudinal direction L> 2S ≧ L / 2. Instead of the pipe (circular tube) stirrer 28, a plate stirrer may be used. Moreover, between each stirring part 28 and the rotational drive shaft 24, it has the opening 29b of front view cross-section "B" shape, is extended radially outward at intervals of 120 degrees in the circumferential direction, and the front-end | tip. From the side to the base end (rotation drive shaft 24) side, the width gradually increases, and the base end portions adjacent to each other as viewed from the side are connected and supported by a support portion 29 connected in a curved shape. In addition, the code | symbol 29a in FIG. 1 is a rib. The reason why both sides of each support portion 29 are curved so as to expand in a circular arc shape toward the base end without forming a straight line with a constant width is to reduce resistance during stirring (rotation).

As shown in FIGS. 1 to 3, the tip stirring portion 28 of the stirring blade 27 in the feeder portion 2 is arranged in close proximity to the outer peripheral edge of the screw 55 b of the screw rod 55 of the screw pump portion 5. Further, the left and right (front and rear) stirring sections 28 extend long, and both of them reach the almost entire length in the longitudinal direction in the feeder casing 21. 2 and 3, along the horizontal bottom surface 22a of the pump casing 51 in the direction perpendicular to the longitudinal direction ( axial direction of the rotary drive shaft 24). A plate valve 7 is provided. The plate valve 7 is provided with a nut portion 75 that is arranged so that the valve main body 71 can enter and exit along the horizontal bottom surface 22a, and is screwed with the screw rod 74 by rotating the screw rod 74 through the handle 73. The valve body 71 enters and exits along the horizontal bottom surface 22a and is opened and closed. The nut portion 75 is fixed to the base end portion in the pipe-shaped cover 76, and the pipe-shaped cover 76 is integrally fixed on the valve main body 71. As shown in FIG. 2, in a state where the valve main body 71 is opened, the tip end portion 71 a of the valve main body 71 slightly protrudes into the push-in port 30 and covers a part of the push-in port 30. Since the tip protruding portion 71a of the valve body 71 is located on the rotation direction side of the stirring blade 27, the dehydrated cake stirred in the feeder section 2 is pushed into the pump casing 51 and then leaks out to the feeder casing 21 side. Is preventing. The valve body 71 of the plate valve 7 is opened and closed by rotating a manual handle 73 disposed below the electric motor 26. The plate valve 7 is left open except during inspection, disassembly and assembly of the screw pump unit 5.

Claims (6)

The dewatered cake put in the feeder casing is pushed into the lower pump casing while being stirred through the stirring blades, and is pushed in while being transferred into the suction port of the uniaxial eccentric screw pump in front by the screw rod in the pump casing. In a dewatering cake pressure feeding device equipped with a uniaxial eccentric screw pump, which is conveyed to a predetermined place by a shaft eccentric screw pump,
A rotational drive shaft is disposed in the feeder casing and both ends thereof are rotatably supported by bearings,
At least two sets of stirring blades are attached to the rotary drive shaft with an interval in the axial direction of the rotary drive shaft and shifted in phase,
Three or more stirring protruding on both sides in the axial direction of the rotary drive shaft in the radius direction end portion of the stirring blade of each set, disposed at equal intervals in the circumferential direction,
A dewatering cake pumping device provided with a uniaxial eccentric screw pump, wherein each stirring portion and the rotary drive shaft are connected by a support portion having an opening. The total length of two or more sets of the stirring sections is ½ or more of the length of the feeder casing , The dewatering cake pressure feeding device provided with a uniaxial eccentric screw pump. Wherein the boundary position of the feeder casing and said pump casing, provided with plate valve to open and close while out along the bottom surface of the feeder casing in a direction orthogonal to the axial direction of the rotary drive shaft A dewatering cake pumping device comprising the uniaxial eccentric screw pump according to claim 1 or 2. The plate valve is housed in the feeder casing so as not to protrude to the outside, and the valve body of the plate valve is slightly open with its tip portion protruding into the push-in port with the pump casing in the open state. A dehydrated cake pumping device provided with a uniaxial eccentric screw pump according to claim 3, wherein a part of the dehydrated cake is covered .   A stator of a single-shaft eccentric screw pump is connected to the front surface of the pump casing, and the rear end of the rotor in the stator is disposed on the rear wall surface of the pump casing. A universal joint is interposed between the rotor and the screw rod, and at least one of the universal joint and the adjacent rotor end is kneaded integrally with the outer peripheral surface of the screw. The dehydrated cake pumping device provided with the uniaxial eccentric screw pump according to any one of claims 1 to 4, wherein the dehydrated cake pumping device is covered with a sleeve-like cover attached so as to exhibit a function. , 6. A dewatering cake pumping device comprising a uniaxial eccentric screw pump according to any one of claims 1 to 5, wherein the pump casing is separated back and forth at the position of the universal joint and is separably connected by a one-touch joint .

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