JPH1182358A - Energy recovery type pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover the high-pressure energy discarded from a discharge port so as to effectively utilize this energy as a part of the driving force in a pump having a rotor to be rotated by a driving source by forming a rotor with a fluid receiver part, and providing this fluid receiver part with an injecting means for injecting the fluid. SOLUTION: In the case of desalting the sea water, an energy recovery type pump 10 is driven so as to suck the liquid to be treated (sea water) from a suction port 19 and lead it into a rotary drum 15, and the led liquid is rotated with the rotation of the rotary drum 15 so as to generate a remarkably high dynamic pressure and static pressure. The liquid to be treated is flowed from a flow-in port 20a into a Pitot's tube 20, and flowed to a discharge pipeline 17 as a high-pressure liquid to be treated, and led out from a discharge port to a reverse osmotic pressure column. Thereafter, the liquid to be treated, which is not transmitted through a hollow yarn film in the reverse osmotic pressure column, is flowed to an injection nozzle 23 of the energy recovery type pump 10, and injected from an injection port 23a toward a bucket 22A of the rotary drum 15 so as to assist the rotating force of the rotary drum 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy recovery type pump, and more particularly, to recovering high-pressure energy discharged from a pitot tube type pump and remaining in a used liquid after being used in a predetermined process to reduce the rotational driving force of the pump. It relates to an energy recovery type pump that can be used.

[0002]

2. Description of the Related Art FIG. 10 shows an outline of a solvent separating apparatus for separating a solvent (for example, pure water) from a solution (for example, salt water).
In the figure, reference numeral 1 denotes a pitot tube pump which pressurizes and discharges a handling liquid at a high pressure, and 2 denotes a reverse osmotic pressure column, which separates a solvent from a high-pressure solution supplied from the pitot tube pump 1. In the reverse osmotic pressure column 2, a large number of hollow fibers made of a porous body having fine pores are bundled and stored. Reference numeral 3 denotes a storage tank for storing the solvent separated by the reverse osmotic pressure column 2.

[0003] In the reverse osmotic pressure device 2, the remaining liquid from which the solvent has been separated is discharged through the outlet 4 or sent to another process. The handling liquid delivered from the outlet 4 has a small pressure drop, and the discharge pressure of the pump 1 is 90%.
% High pressure is maintained. However, conventionally, this high-pressure energy was discarded without being particularly used.

[0004]

SUMMARY OF THE INVENTION The present invention was devised in view of the above circumstances, and as described above, the high-pressure energy discarded from the discharge port 4 can be recovered and effectively used as a part of the driving force. It is an object of the present invention to provide an energy recovery type pump.

[0005]

According to a first aspect of the present invention, there is provided a pump having a rotating body rotated by a drive source, wherein a fluid receiving portion is formed on the rotating body, and An ejection means for ejecting a fluid to the fluid receiving portion is provided. Thus, after the liquid is discharged from the pump, the used liquid is returned to the pump and is jetted from the jetting means to the fluid receiving portion, thereby giving the kinetic energy of the liquid to the fluid receiving portion and causing the rotator to rotate. Enhances the driving force and recovers the energy remaining in the handling liquid.

In a second aspect based on the first aspect, the fluid receiving portion is formed by a plurality of buckets of Pelton turbines formed along the rotational direction of the rotating body. As a result, the handling liquid injected into the bucket returns obliquely rearward, and does not hit the subsequent adjacent bucket, so that the efficiency of energy recovery is improved.

In a third aspect based on the first aspect, the fluid receiving portion is a blade-like impeller formed on a side surface of the rotating body. Thereby, the handling liquid can be ejected to the position of the fluid receiving section in which the peripheral speed of the fluid receiving section is lower than the ejection speed of the handling liquid from the ejecting means, and the stress of the handling liquid applied to the fluid receiving section acts effectively. .

In a fourth aspect based on the first to third aspects, the pump is a pitot tube pump, and the fluid receiving portion is formed on an outer peripheral surface of a rotating body having a pitot tube built therein.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, there is provided a handled liquid in which the jet fluid is discharged from the pump and then returned to the pump.

In a sixth aspect based on the first aspect, the jet fluid is jetted from a plurality of discharge ports provided at a central portion of the rotating body toward an outer periphery of the rotating body.

[0011]

1 and 2 show an embodiment of the present invention. Numeral 10 generally indicates an energy recovery type pump of the present invention, and in this example, an example of a pitot tube type pump will be described. Reference numeral 11 denotes a housing which constitutes an outer wall cover of the pump, and front and rear (left and right in the figure) surface portions 11A and 11B, rear (right in the figure).
The surface portion 11B is formed to be detachable from the front surface portion 11A.
12A and 12B are bearing portions provided at the center of each of the front and rear surfaces 11A and 11B, and bearings 13A and 13B are attached to each. The drive shaft 14 is supported by the bearing 13A of the front surface 11A. The other part of the drive shaft 14 is an electric motor (not shown)
Concatenate.

Reference numeral 15 denotes a rotary drum provided in the housing 11, and similarly to the housing 11, the rear surface 15B of the front and rear (left and right in the figure) surface portions 15A and 15B is formed detachably with respect to the front surface 15A. These front and rear parts 1
A boss 16A is formed at the center of each of 5A and 15B.
The boss 16A is attached with the end of the drive shaft 14 and connected thereto.
The boss 16B is mounted on the bearing 13B. Therefore, the rotating drum 15 is connected to the housing 1 via the bearings 13A and 13B.
1 is rotatably supported.

Reference numeral 17 denotes a discharge pipe, one end of which is a housing 1.
In addition to being fixed to the first bearing portion 12B, it is inserted through the boss 16B of the rotating drum 15. A gap is provided between the discharge pipe 17 and the boss 16B to form a suction flow path 18. One side of the suction passage 18 communicates with the inside of the rotary drum 15 and the other end communicates with a suction port 19 formed in the bearing portion 12B. The other end (the left end in the figure) of the discharge pipe 17 is connected to a pitot tube 20 that rises upward from the center of the rotary drum 16, and the front end matches the discharge port 21 formed in the bearing 12 </ b> B #. Let it. The tip of the pitot tube 20 is the inlet 20
It is open as a.

The above is the prior art. In the present invention, a number of buckets 22 as fluid receiving portions equivalent to buckets of a so-called Pelton turbine are attached to the outer peripheral surface of the rotary drum 15 along the circumferential direction. The horizontal sectional shape of the bucket 22 is substantially three as shown in FIG. 23
Is an injection nozzle as an injection means provided in an upper portion of the housing ￥, and the direction of the injection port 23a * is directed toward the bucket 22A at the uppermost position of the rotary drum ￥. Reference numeral 24 denotes a discharge port formed on the bottom surface of the housing #.

FIG. 4 shows the energy recovery pump 10 of the present invention.
An outline of a solvent separation device incorporating the above is shown. This device differs from the conventional one (FIG. 10) in that the energy recovery pump 10 of the present invention is used instead of the pitot tube pump 1, and the outlet 4 is connected to the injection nozzle 23 of the energy recovery pump 10. It is a point connected to the base end. In addition, the same code | symbol was used for the matter common to a prior art as it is.

Next, the operation of this embodiment will be described. In this example, an example in which seawater is desalinated will be described. When the energy recovery pump 10 is driven, the handling liquid (seawater) is sucked from the suction port 19 and is introduced into the rotating drum 15 via the suction channel 18. In the rotating drum 15, the handling liquid rotates with the rotation of the rotating drum 15, and extremely high dynamic pressure and static pressure are generated. Here, the handling liquid flows into the pitot tube 20 from the inlet 20a of the pitot tube 20, and a part of the velocity head is converted into a pressure head, so that the pressure becomes extremely high (in this example, 70 kg / cm). The high-pressure handled liquid flows through the discharge pipe 17 and the discharge port 21 to the reverse osmotic pressure column 2.

In the reverse osmotic pressure column 2, a solvent (pure water) passes through the hollow fiber membrane from the handling liquid (seawater) while the handling liquid passes through the hollow fiber under high pressure, and the solvent is taken out (in this example, the solvent outlet). 7 kg
/ Cm) 5 to the storage tank 3. On the other hand, the remaining handling liquid that does not pass through the hollow fiber membrane passes through the hollow fiber while maintaining the high pressure (63 kg / cm), and flows from the outlet 4 to the injection nozzle 23 of the energy recovery pump 10. In addition,
The handling liquid that does not permeate through the hollow fiber membrane has a higher solute (mainly salt) concentration due to the separation of pure water.

The handling liquid flowing to the injection nozzle 23 is injected from the injection port 23a toward the bucket 22A at the uppermost position of the rotary drum 15. As a result, the bucket 22
A receives the ejection of the handling liquid, and receives a force in the ejection direction, that is, the rotation direction of the rotary drum 15. This makes the rotating drum 1
The driving force of No. 5 was promoted, and the energy was recovered. Therefore, it is possible to save and reduce the energy consumption of the original driving force of the rotating drum 15 accordingly.

The handling liquid injected into the bucket 22A # violently hits the bucket 22A and tends to bounce back. However, it is designed so that it actually splits right and left and rebounds obliquely rearward and does not hit the subsequent adjacent bucket 22B. The handling liquid that has bounced off the bucket 22 </ b> A # falls to the bottom of the housing 11 and is discharged from the outlet 2.
It is discharged from 4.

FIG. 5 shows a second example of the energy recovery pump 30.
The following shows an example. In this example, the bucket 32 has a substantially U-shaped cross section, and is provided on the circumference of the front surface portion 15A of the rotating drum 15 near the rotation center. The injection nozzle 33 is firstly adjusted to the position of the bucket 32 which is located at the uppermost position.
It is attached to the housing 11 lower than in the case of the embodiment.
Alternatively, the mounting position is the same as that of the first embodiment, and the direction of the injection port 33 is slightly downward, and the injection port 33 is directed toward the bucket 32 which comes to the uppermost position.

In this example, the handling liquid injected into the bucket 32 hits the bucket 32 and
It rebounds diagonally backward on the 1A side. Note that the energy recovery effect is not effectively exhibited unless the injection speed of the handling liquid injected from the injection nozzle 33 is higher than the peripheral speed of the bucket 32. By the way, the peripheral speed of each point of the rotating drum 15 is higher at a position farther from the drive shaft 14. Therefore, the peripheral speed of the bucket 32 of the second embodiment is lower than the peripheral speed of the bucket 22 of the first embodiment. Therefore, when energy cannot be sufficiently recovered in the first embodiment, the problem may be solved by adopting the form of the second embodiment.

FIG. 6 shows a third embodiment of the energy recovery pump 40.
The following shows an example. In this example, the mounting position of the bucket 42 is on the front surface of the rotary drum 15 as in the second embodiment. Its shape is elongated in the radial direction, that is, an impeller shape extending from the vicinity of the rotating shaft to the outer peripheral portion of the rotating drum 15.
Supports the housing 11 so that it can rotate vertically within a predetermined range. That is, the injection nozzle 43 is configured to be able to change its direction so as to be able to inject a range from the upper end to the lower end of the bucket 42 that has reached the uppermost position of the rotary drum 15.

The change in the direction is automatically changed in accordance with the rotation speed of the rotary drum 15. That is, when the rotation speed of the rotary drum 15 is low, the injection nozzle 43 is directed toward the position of the bucket 42 near the outer peripheral portion of the rotary drum 15, and when the rotation speed of the rotary drum 15 is high, the center of the rotary drum 15 is The injection nozzle 43 is automatically directed in the direction of the position of the bucket 42 close to the part. Thus, regardless of the rotational speed of the rotating drum 15, efficient energy recovery is always performed.

FIG. 8 shows a fourth embodiment of the energy recovery pump 50.
The following shows an example. In this example, an impeller 52 is used instead of the bucket 、, and the mounting position is the front portion 15A of the rotating drum 15 as in the third embodiment. The shape is the same as that of the impeller of the centrifugal pump, and a plurality of those that are curved in the anti-rotation direction from the center of the rotation drum toward the radial direction from the center of the rotation drum 15 are formed.

The bearing portion 12A of the housing 11 is formed with an inflow port 55 ° for inflow of the reflux of the handling liquid, and a ring tube 56 is provided around the outside of the drive shaft 14 near the boss 16A. And the above inlet 5
5 is communicated. In addition, the ring pipe 56 is provided with an injection port 53 for injecting the handling liquid in an outer peripheral direction at an appropriate number of positions on the outer peripheral portion (three at even intervals in this example). As described above, in this example, the handling liquid ejected from a plurality of locations from the vicinity of the center of the rotary drum 15 toward the outer periphery is applied to the impeller. Is reduced.

[0026]

As described above, according to the present invention, the used handling liquid in which high-pressure energy remains is returned to the pump and injected into the bucket formed on the rotating body, so that the driving force of the rotating drum is reduced. The energy that was promoted and wasted before can be recovered effectively. Further, the shape of the bucket and the manner of spraying the handling liquid onto the bucket can be variously modified, and more effective energy recovery can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of an energy recovery pump according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a sectional view of a bucket of the energy recovery pump according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a solvent separation device incorporating the energy recovery pump of the present invention.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the energy recovery pump according to the present invention.

FIG. 6 is a longitudinal sectional view showing a third embodiment of the energy recovery pump according to the present invention.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the energy recovery pump according to the present invention.

FIG. 9 is a sectional view taken along the line CC of FIG. 8;

FIG. 10 is a block diagram showing a solvent separation device incorporating a conventional energy recovery pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pitot tube pump 2 Reverse osmotic pressure column 3 Storage tank 4 Outlet 5 Solvent outlet 10 Energy recovery type pump 14 Drive shaft 20 Pitot tube 22 Bucket 23 Injection nozzle 23a Injection port 30 Energy recovery type pump 32 Bucket 40 Energy recovery type pump 42 Bucket 43 Injection nozzle 50 Energy recovery pump 53 Injection port 56 Ring tube

Claims (7)

[Claims] 1. A pump having a rotating body rotated by a driving source, wherein the rotating body is provided with a fluid receiving portion and an ejection means for ejecting a fluid to the fluid receiving portion is provided. Recovery type pump. 2. The energy recovery pump according to claim 1, wherein said fluid receiving portion is a plurality of Pelton turbine buckets formed along the circumferential direction of rotation of said rotating body. 3. The energy recovery pump according to claim 1, wherein said fluid receiving portion is a blade-like impeller formed on a side surface of said rotating body. 4. The energy recovery pump according to claim 1, wherein said injection means is an injection nozzle. 5. The pump according to claim 1, wherein the pump is a pitot tube pump, the fluid receiving portion is formed on an outer peripheral surface of a rotating body containing the pitot tube, and the jetting means is provided on a casing containing the rotating body. The energy recovery pump according to claim 1, wherein: 6. After the jet fluid is discharged from a pump,
6. The energy recovery pump according to claim 1, wherein the liquid is a handled liquid refluxed to the pump. 7. The rotating body according to claim 5, wherein said ejected fluid is ejected from a plurality of discharge ports provided at a central portion of said rotating body toward an outer periphery of said rotating body. Energy recovery pump.