JPS63256103A - Membrane separator - Google Patents

Abstract

PURPOSE:To reduce noise sources by using a water-cooled driving motor, and coupling the driving motor directly to a multiple-stage centrifugal pump without using a bearing unit for coupling in the title membrane separator using a membrane module. CONSTITUTION:The driving motor 19 is cooled by water, and a cooling water passage is formed on the inside of a casing 19b. The coupling part 20 between the multiple-stage centrifugal pump 18 and the driving motor 19 is formed with a housing 20a, a cylindrical coupling 20b, etc. Namely, one side of the housing 20a is fixed to the end face of the motor casing 19b by a bolt 24, and the suction-side casing 18c of the pump casing is abutted on the other end face of the housing 20a through a seal retainer 25 and clamped and fixed by a bolt 26. As a result, a cooling fan, etc., are omitted, and the noise due to the operation of a pump device can be remarkably reduced.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is mainly used in the medical industry, chemical industry, etc., and relates to the improvement of a membrane separation device using a so-called membrane module. be.

(Membrane separation devices that use conventional technology modules can efficiently separate solute molecules contained in a solution without using heat, and when used as a water purification device, they can achieve extremely high purity. It is possible to obtain high-quality treated water with low energy consumption.

By the way, all conventional membrane separation devices using membrane modules directly connect a multistage centrifugal pump 1 and an air-cooled motor 2 through a coupling unit 3 and a bearing unit 4, as shown in FIG. Using a pump device configured as described above, the liquid to be treated is pressurized to about 3 to 60 kg/cd and is pumped to the membrane module.

As a result, during operation of the pump device the bearing unit 4
There is a problem in that the horns, etc. become noise sources, and the horns emit as high a noise as the horns. In particular, even if a pure water device or the like is compactly designed and manufactured, it cannot be installed as is in rooms such as hospitals and laboratories, which causes various problems in practical use.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems in conventional membrane separation devices using membrane modules, namely, the operating noise of the pump device is high and the device cannot be easily installed indoors. In order to solve this problem, a water-cooled motor is used as the drive motor, and the drive motor and multistage centrifugal pump are directly connected without using a connecting bearing unit, thereby reducing noise sources. The purpose of the present invention is to provide a membrane separation device that enables a significant reduction in operating noise.

(Means for Solving the Problems) The present invention provides a membrane separation device configured to pump a pressurized solution using a pump device to a membrane module consisting of a semipermeable membrane to separate solutes, etc. in the solution. In the pump system @7, the motor shaft of a water-cooled motor having a cooling water passage formed in the motor casing and the pump shaft of a multistage centrifugal pump are directly connected by a short cylindrical rigid coupling, and the motor casing and pump casing are connected directly to each other. The basic structure of the invention is that the two are connected by a housing.

(Operation) After the solution to be treated is pressurized to a predetermined pressure by a pump device, it is pumped into the membrane module, where it is subjected to treatments such as separation and filtration.

The motor shaft and pump shaft of the pump device are directly connected via a short cylindrical rigid coupling without the need for a separate bearing device for connection. Rotates while being supported. Further, the drive motor of the pump device is of a water-cooled type in which a cooling water passage is formed in the pump casing, and is cooled by water flowing through the cooling water passage, and a cooling fan or the like is omitted. As a result, the operating noise of the pump device is significantly reduced.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

FIG. 1 is a front view of a membrane separation device (pure water device) according to the present invention, FIG. 2 is a plan view, FIG. 3 is a side view, and FIG. 4 is a piping system diagram.

In the figure, 5 is a raw water population valve, 6 is a filter, 7 is a pump device, 8 is a membrane module, 9 is a treated water tank, 10
is a control panel, 11 is a water system panel, 12 is a drain pan, 13 is a flow meter, 14 is a treated water supply pump, 15 is a pressure gauge, 16
is a pressure switch, and 17 is a thermometer.

As shown in FIG. 5, the pump device 7 is a known multistage centrifugal pump 18 and a drive motor 19 that are directly connected through a connecting part 20, and the multistage centrifugal pump 18 has a pump shaft 18a. , a pump casing including a suction casing 18C and a discharge casing 18d,
It is composed of a multi-stage noryl resin stage assembly 21 consisting of a b1 impeller, an intermediate casing, an intermediate bearing, etc., a mechanical seal 22, etc. The capacity of the multistage centrifugal pump 18 in this embodiment is 300 m.
, current ffl 40001/hr.

A two-pole water-cooled three-phase induction motor is used as the drive motor 19, and in this embodiment, a 7.5 KW motor is used. The MS motor 19 has a so-called water-cooled structure, and a cooling water passage is formed inside a motor casing 19b that supports a stator core and stator windings (not shown). Cooling water Wc is pump 1
Inlet 19c from the outlet side of 9 or other cooling water source
The water is supplied to the cooling water passage, and is discharged from the outlet 19d through the cooling water passage.

The connecting portion 20 between the multistage centrifugal pump 18 and the drive motor 19 has a housing 20a and a length 8 as shown in FIG.
It is composed of a short, separate cylindrical coupling 2°b with a length of about 0 degrees. That is, one side of the housing 20a is fixed by a bolt 24 on the end face of the motor casing 19b, and the suction side casing 19c of the pump casing 19b is a seal retainer on the other end face of the housing 20a. 25 are interposed in between, and are tightened and fixed with bolts 26.

The motor shaft 19a and the pump shaft 18a are
The housing 20a is connected by a coupling 2b disposed inside the housing 20a, and the coupling 20b and both shafts 18b and 19a are wedged by a motor shaft key 27 and a pump shaft key 28. 0In addition, in the M5 diagram, 29 is a set screw, (capital) is a plunger, and the tip of the pump shaft 18a is connected to the coupling 2O.
When inserted into B, the ball 30 at the tip will be in place.
a protrudes into the locking hole 31 on the side of the coupling 2Ob due to the elasticity of the spring 30b, and the pump shaft 1
8 Regulate the insertion position of a.

The membrane module 8 is a known reverse osmosis membrane or an ultrafiltration membrane, and in this embodiment, 14 membrane module elements (reverse osmosis modules) of A' are connected in series.

Next, the operation of the pure water apparatus according to the present invention will be explained.

The raw water W supplied from the raw water supply port 32 is passed through the filter 6
The water is sent to the pump device 7 through the membrane module 8, and after being pressurized to about 10 to 50 I (g/ct) by the multistage centrifugal pump 18, it is supplied to the membrane module 8. is stored in a treated water tank 9 and sent to a predetermined location through a meter 13 and a supply pump 14.

In the case of this embodiment, raw water supply ffi 40001/
h.

Treated water flow ft 2000Ij/b, pump head 30
0 m and motor capacity ffi 7.5 KW.

The motor shaft a and the pump shaft 18a, which are connected by the short cylindrical split coupling, rotate while being supported only by the bearing inside the motor and the bearing inside the pump.

Note that the drive motor 19 is normally supplied with cooling water Wc from a raw water supply source, and high-pressure cooling water is supplied from the pump outlet side as necessary.

In addition, in this embodiment, a water purification device has been explained, but the present invention can also be applied to various other devices, such as wastewater treatment devices, purification/concentration devices in the food industry, etc., and separation/removal devices in the pharmaceutical industry. Of course, it can also be used as a device.

(Effects of the Invention) The present invention provides a pump device in a membrane separator that includes a water-cooled motor with a cooling water passage formed in the pump casing and a multistage centrifugal pump, and furthermore, the pump device includes a drive motor and a multistage centrifugal pump. Since the pump is directly connected to the pump without the need for a special bearing device, noise sources are reduced compared to conventional pump devices, and the noise from the membrane separator's operating port is significantly reduced.

For example, motor capacity 7.5KW, pump capacity 40001
/h/lifting height of 300 m, the operating noise near the pump device is reduced from the conventional 85-90 horns to about 60-65 horns, making it possible to install the membrane separation device indoors.

Furthermore, since the pump shaft and the motor shaft are directly connected to each other by a short rigid coupling, the pump device can be made smaller, and the membrane separation device can be made more compact.

As described above, the present invention exhibits excellent practical utility.

[Brief explanation of the drawing]

FIG. 1 is a front view of a pure water apparatus according to an embodiment of the present invention, FIG. 2 is a plan view, FIG. 3 is a side view, and FIG. 4 is a piping system diagram. FIG. 5 is an exploded explanatory view showing the main parts of the pump device. FIG. 6 is a longitudinal cross-sectional view showing the shaft connecting portion of the pump device. FIG. 7 is a schematic diagram of a conventional pump device. 7 Pump device 8 Membrane module 19 Water-cooled motor 19 a Motor shaft 19 b Motor casing 18 Multistage centrifugal pump 18 a Pump shaft 18 b Pump casing 20 Connecting portion 20 a Housing 20 b Coupling patent applicant Shin Mikuni Kikai Co., Ltd. Representative Slope
Book Asahi Figure 1 Figure 2 Figure 3 @ 7 Figure 1'(' 5 Figure 1 Aki 30 2b

Claims (1)

[Claims] In a membrane separation device configured to pump a pressurized solution by a pump device (7) to a membrane module (8) consisting of a semipermeable membrane to separate solutes, etc. in the solution, the pump device (7) is configured to: A membrane separation device characterized by low noise, comprising a water-cooled motor (19) with a cooling water passage formed in a motor casing (19b); and a multistage centrifugal pump (18) directly connected to the water-cooled motor (19).