JPH07167045A - Pump for conveying fluid - Google Patents

Abstract

PURPOSE:To provide a pump for conveying fluid which is constituted to continuously convey high viscosity fluid through a pipe without the occurrence of pulsation. CONSTITUTION:Formation of a screw 10 is such that belt vanes 14 and 16 are mutually reversely helically wound around the front and rear peripheries of an inner cylinder 12 and the screw 10 is provided to be rotated by a rotation means 20. An inflow port 18 for fluid is opened approximately to the central part of the inner cylinder 12. A piston 30 reciprocated by a moving means 40 is inserted in throughout a range of from the rear end of the inner cylinder 12 approximately to the central part of the inner cylinder 12. A screw 10 is rotatably contained and held inside an outer cylinder 50. Fluid charge ports 52 and 54 are opened to the part, corresponding to the peripheries of the front and the rear end of the screw 10, of the outer cylinder 50. A surge tank 60 communicated with the interior of the outer cylinder 50 is arranged on the periphery of approximately the central part of the outer cylinder 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid conveying pump for continuously conveying fluid such as miso or the like with little pulsation.

[0002]

2. Description of the Related Art Conventional general-purpose fluid conveying pumps include rotary pumps such as gear pumps, vane pumps, propeller pumps, axial flow pumps, vortex pumps, and screw pumps that continuously convey fluid without pulsation. , There are reciprocating pumps such as piston pumps, plunger pumps, diaphragm pumps, etc. that convey fluid with intermittent pulsation.

[0003]

However, when a fluid such as miso having a high viscosity is conveyed in a long pipe by using the rotary pump, the fluid adheres to the inner wall of the pipe to block the inside of the pipe. As a result, the fluid such as miso could not be smoothly conveyed in the long pipe.

When a fluid such as miso is transported in a long pipe by using the reciprocating pump, the fluid is transported while intermittently pulsating in the pipe so that the pipe moves up and down, left and right, etc. In order to vibrate greatly, the pipe had to be firmly fixed to the base using metal fittings, and it took a lot of time and labor to fix the pipe.

The present invention has been made in view of the above problems, and is a fluid-conveying pump (hereinafter referred to as a pump) capable of continuously and smoothly conveying a fluid such as miso having a high viscosity in a long pipe without pulsation. It is intended to provide).

[0006]

In order to achieve the above-mentioned object, the pump of the present invention is a screw in which band vanes are spirally erected in opposite spirals and wound around the front and rear of an inner cylinder. A screw that opens a fluid inlet at approximately the center of the inner cylinder where front and rear band vanes wound around the front and rear of the inner cylinder meet, rotation means for rotating the screw, and sliding on the inner cylinder of the screw. A freely inserted piston, a moving means for reciprocating the piston from the rear end of the inside of the inner cylinder to a substantially central portion of the inner cylinder, an outer cylinder rotatably accommodating and holding the screw, and an inner cylinder of the inner cylinder. A fluid inlet that is opened in each of the outer cylinders around the front and rear ends, and a surge tank that communicates with the inside of the outer cylinder that is provided in the outer cylinder around the center of the inner cylinder that opens the inlet. It is characterized in that Ranaru.

In the pump of the present invention, it is preferable that the band vanes are wound around the front and rear of the inner cylinder three times in a spiral shape.

[0008]

In the pump of the present invention, while rotating the screw inside the outer cylinder by the rotating means, the fluid is introduced around the front and rear end portions of the screw accommodated in the outer cylinder from the introduction port opened in the outer cylinder part. At the same time, the moving means causes the piston to reciprocate inside the inner cylinder of the screw from the rear end to almost the center of the inner cylinder. A pipe for carrying a fluid is connected to the front end of the inner cylinder.

Then, the fluid introduced between the adjacent blades of the band blades around the front and rear of the inner cylinder of the screw around the front and rear ends of the screw is transferred to the central portion of the screw while rotating around the inner cylinder. Then, the fluid is transferred into the inside of the inner cylinder through an inflow port opened at substantially the center of the inner cylinder, and continuously transferred inside the inner cylinder to the front. Then, the fluid transferred to the front end of the inner cylinder is continuously conveyed forward in the pipe connected to the front end of the inner cylinder.

At this time, a pulsation is imparted to the fluid transferred inside the inner cylinder by the piston that reciprocates inside the inner cylinder, and the fluid transferred forward inside the inner cylinder is the fluid transferred inside the inner cylinder. It is continuously conveyed while appropriately pulsating inside and inside the pipe connected to the front end of the inner cylinder.

Further, the fluid that cannot be transferred into the inner cylinder and stays around the central part of the inner cylinder is in the surge tank communicating with the outer cylinder provided in the outer cylinder part around the substantially central part of the inner cylinder. Continue to populate. Then, when the piston retreats inside the inner cylinder to the rear and the fluid in front of the piston becomes insufficient, the fluid transferred under pressure into the surge tank is It is pushed into the inside of the outer cylinder and transferred into the inside of the inner cylinder through the inflow port at the substantially central portion of the inner cylinder. Then, the fluid in the surge tank is filled in the inner cylinder portion where the fluid in front of the piston is insufficient. Then, a large pulsation is prevented from occurring in the fluid that is transferred into the inner cylinder by the rotating screw and is continuously conveyed forward in the inner portion of the pipe.

In the pump of the present invention, the fluid introduced into the front and rear ends of the screw is wound around the front and rear sides of the inner cylinder of the screw, and is rotated around the inner cylinder by front and rear band blades. Transfers continuously. Then, the fluid is continuously transferred into the inner cylinder through the inlet at the substantially central portion of the inner cylinder.

Therefore, the fluid introduced into the introduction port of the outer cylinder can be continuously transferred into the inner cylinder of the screw, and the fluid can be continuously transferred forward in the inner cylinder. Then, the fluid can be continuously extruded into the inside of the pipe connected to the front end of the inner cylinder, and the inside of the pipe can be continuously conveyed forward.

Further, in the pump of the present invention, the fluid is simultaneously transferred from the front and rear end portions of the screw to the central portion of the screw by front and rear band blades respectively wound around the front and rear portions of the inner cylinder.

Therefore, as compared with a normal screw type pump, a large amount of fluid is transferred to the central portion of the screw,
The fluid can be continuously and continuously introduced into the inner cylinder through the inflow port at the substantially central portion of the inner cylinder. Then, the fluid can be continuously conveyed forward in the inner cylinder and inside the pipe connected to the front end of the inner cylinder.

Further, in the pump of the present invention, the fluid which is continuously transferred into the inner cylinder by the screw and is continuously transferred in the inner cylinder forward is driven by the piston that reciprocates inside the inner cylinder. It pushes out intermittently toward the front of the cylinder, and continuously conveys the inside of the inner cylinder with appropriate pulsation in front of it.

Therefore, appropriate pulsation is given to the viscous fluid which transfers the inside of the inner cylinder to its front side, and the fluid is not attached to the inner wall of the inner cylinder or the inner wall of the pipe connected to the front end of the inner cylinder. In addition, the inside of the inner cylinder and the inside of the pipe can be smoothly transported forward.

Further, in the pump of the present invention in which the band vanes are spirally wound around the inner cylinder of the screw three times respectively, the number of windings of the band vanes wound around the front and rear of the inner cylinder of the screw is reduced. Due to the small number of screws, pulsation occurs in the fluid that is transferred into the inner cylinder by the screw, and the number of windings of the band vanes wound around the front and rear of the inner cylinder of the screw is large, so the screw for fluid transfer is rotated. It is possible to prevent the rotation load from increasing and the necessity of using a large air motor or the like as the rotating means for rotating the screw.

[0019]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 show a preferred embodiment of the pump of the present invention, FIG. 1 is a front view showing the schematic structure thereof, and FIG. 2 is A of FIG.
FIG. The pump will be described below.

In the figure, reference numeral 10 denotes a screw, which is formed by spirally erecting the band blades 14 and 16 around the front and rear of the inner cylinder 12 in mutually opposite windings. Specifically, the band blades 14 are wound right-handed around the front part of the inner cylinder 12 three times in a spiral shape, and
The band vane 16 is wound in a left-handed spiral around the rear part three times.

Inner cylinder 12 in which front and rear band blades 14 and 16 wound around the inner cylinder 12 of the screw meet.
One or a plurality of fluid inlets 18 are opened in the substantially central portion of the.

Reference numeral 20 is a rotating means for rotating the screw 10. The rotating means 20 includes a gear 22 fitted to the rear end of the inner cylinder 12 of the screw, and an air motor 2 with a speed reducer.
6 and the gear 2 fitted to the output shaft 28 of the air motor
4 and a gear 24 meshed with the gear 22.

A piston 30 is provided in the inner cylinder 12 of the screw.
Is slidably inserted.

Reference numeral 40 is a moving means for moving the piston 30 back and forth inside the inner cylinder 12 of the screw from its rear end to almost the center of the inner cylinder 12. The moving means 40 is formed of an air cylinder 42 provided at the rear of the inner cylinder 12, and a rod 44 that moves in and out of the air cylinder 42 is connected to the rear end of the piston 30.

Reference numeral 50 denotes an outer cylinder, in which the screw 10 is rotatably accommodated and held.

An outer cylinder 50 around the front and rear ends of the screw 10.
Fluid inlets 52 and 54 are opened in the respective portions.

A surge tank 60 having a substantially half-ring shape is provided in the outer cylinder 50 portion around the substantially central portion of the inner cylinder 12 having the inflow port 18 opened so as to surround the outer cylinder 50. The surge tank 60, as shown in FIG.
It communicates with the inside of the outer cylinder 50 through a through hole 62 that is opened in the 0 portion.

The pump shown in FIGS. 1 and 2 is constructed as described above.

Next, an example of use of this pump and its operation will be described.

As shown in FIG. 1, the bifurcated cylindrical fluid outlets 72, 74 of the hopper 70 are connected to the inlets 52, 54 opened in the outer cylinder 50, respectively. A fluid is introduced into 70. And
The fluid is continuously charged around the front and rear ends of the screw 10 through the discharge ports 72 and 74 of the hopper and the charging ports 52 and 54 of the outer cylinder 50. At the same time, the rotating means 20 rotates the screw 10 inside the outer cylinder 50, while the moving means 40 rotates the piston 30.
Is reciprocated inside the inner cylinder 12 from its rear end to almost the center of the inner cylinder 12. A pipe 80 for transporting the fluid is connected to the front end of the inner cylinder 12 via a joint 80a so that the inner cylinder 12 is rotatable without being restricted by the pipe 80.

Then, the inner cylinder 12 of the screw is replaced by the joint 8
Under the action of 0a, the pipe 80 connected to the front end of the inner cylinder 12 continues to rotate inside the outer cylinder 50 without being hindered. The front and rear band blades 14 and 16 wound around the front and rear of the inner cylinder 12 of the screw in opposite windings, respectively, and between the adjacent blades of the front and rear band blades 14 and 16 rotating with the inner cylinder 12 of the screw 10. The fluid injected around the front and rear ends rotates around the inner cylinder 12 and the screw 10
Are continuously transferred to the central part of the same. Then, the fluid flows into the inflow port 18 at the substantially central portion of the inner cylinder 12.
It is transferred into the inner cylinder 12 through the inside and is continuously transferred to the front inside the inner cylinder 12. And the inner cylinder 12
The fluid that is transported to the front inside is continuously transported from the front end of the inner cylinder 12 to the front inside the pipe 80 connected thereto.

At this time, a pulsation is imparted to the fluid transferred inside the inner cylinder 12 by the piston 30 that reciprocates inside the inner cylinder 12, and the fluid transferred inside the inner cylinder 12 is moved forward. The body is continuously conveyed while appropriately pulsating inside the inner cylinder 12 and inside the pipe 80 connected to the front end of the inner cylinder 12. Then, the viscous fluid does not adhere to the inner wall of the inner cylinder 12 or the inner wall of the pipe 80, and can be smoothly transported forward in the inner cylinder 12 and the pipe 80.

Further, the inner cylinder 1 cannot be transferred into the inner cylinder 12 and
(2) The fluid staying around the central portion continues to be transferred into the surge tank 60 provided in the outer cylinder 50 portion around the substantially central portion of the inner cylinder 12. Then, when the piston 30 retreats inside the inner cylinder 12 rearward and becomes short of the fluid in front of the piston 30, the fluid that has been transferred into the surge tank 60 in a pressurized state is It is pushed out of the surge tank 60 to the inside of the outer cylinder 50 and transferred into the inner cylinder 12 through the inflow port 18 at the substantially central portion of the inner cylinder 12. And
The fluid in the surge tank 60 is filled in the inner portion of the inner cylinder 12 in the state where the fluid in front of the piston 30 is insufficient. Then, large pulsation is prevented from being generated in the fluid that is transferred into the inner cylinder 12 by the screw 10 and continuously conveyed in the front of the inside of the pipe 80.

In the above-mentioned pump, it is preferable that the band blades 14 and 16 are respectively wound around the inner cylinder 12 of the screw in a spiral shape three times.
When the band blades 14 and 16 are wound around the front and rear of the machine a small number of times less than twice, respectively, the inner tube 1 is screwed by the screw 10.
(2) There is a risk that the amount of fluid continuously transferred into the interior will vary, causing pulsation in the fluid. On the contrary, when the band vanes 14 and 16 are wound around the inner cylinder 12 of the screw four times or more, respectively, an excessive load is applied to the rotating means 20 for rotating the screw 10 for transferring the fluid. Therefore, it becomes necessary to use a large air motor or the like as the rotating means 20 for rotating the screw 10.

Further, in the above-mentioned pump, as shown in FIG. 1, the cylindrical discharge ports 72 and 74 of the hopper 70 are provided.
Is spirally bent once or several times, and the fluid introduced into the outer cylinder 50 receives the rotational force of the band blades 14 and 16 around the screw 10 around which the fluid rotates, and the inlets 52 and 54 and the outlet described above are received. It is better to prevent it from being pushed back into the hopper 70 through 72 and 74.

[0036]

As described above, according to the pump of the present invention, a viscous fluid such as miso can be continuously conveyed in a long pipe without causing large pulsation. Further, it is possible to prevent the pipe from vibrating largely up and down, to the left and right due to the fluid that conveys the inside of the pipe, and it is possible to save the troublesome work of fixing the pipe for delivering the fluid to the base or the like by using the metal fitting.

At the same time, the fluid that is continuously conveyed inside the pipe is provided with appropriate pulsation so that the fluid having viscosity or the like does not adhere to the inner wall of the pipe and is smoothly conveyed inside the pipe. Can continue to do.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic structure of a pump of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 10 Screw 12 Inner Cylinder 14, 16 Band Blade 18 Fluid Inlet 20 Rotating Means 22 and 24 Gear 26 Air Motor 30 Piston 40 Moving Means 42 Air Cylinder 50 Outer Cylinder 52, 54 Fluid Inlet 60 Surge Tank 70 Hopper 80 pipes

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area F04B 15/02 A

Claims (2)

[Claims] 1. A screw having spirally erected spirally-wound band blades around each of the front and rear sides of the inner cylinder and spirally erected in opposite directions. A screw having a fluid inlet opening at approximately the center, a rotating means for rotating the screw, a piston slidably inserted in the inner cylinder of the screw, and the piston inside the inner cylinder from the rear end. A moving means for reciprocating to an approximately central portion of the inner cylinder, an outer cylinder rotatably accommodating and holding the screw, and a fluid inlet that is opened in an outer cylinder part around the front and rear ends of the screw, respectively. A fluid-conveying pump, comprising: a surge tank communicating with the inside of an outer cylinder provided in an outer cylinder part around a substantially central part of the inner cylinder having the inflow port opened. 2. The fluid conveying pump according to claim 1, wherein band vanes are respectively wound around the front and rear peripheral walls of the inner cylinder three times.