JPH1085562A - Union restricting orifice and filtration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a union restricting orifice which can easily be installed and replaced and save cost by reducing the number of parts and to provide a filtration device equipped with this union restricting orifice. SOLUTION: A union screw 3 is screwed into piping 1 and also a disc 6 with a hole 6a serving as a restricting orifice and an elastic member 8 are fitted into the inner wall face 3c of the union screw 3. In addition, a union collar 4 is screwed into piping 2 and a union nut 5 is fitted into the union collar 4. At the same time, packing 7 is fitted into the outer wall face 4d of the union collar 4. Further, the union screw 3 and the union collar 4 are connected together by screwing the union nut 5 into the union screw 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device for filtering while circulating a stock solution, connecting two pipes through which a gas or liquid such as air flows, and removing suspended substances accumulated in a filtration membrane. TECHNICAL FIELD The present invention relates to a union type restriction orifice for uniformly distributing the flow rate of air supplied to each filtration membrane during air bubbling, and a filtration device having the same.

[0002]

2. Description of the Related Art In a filtration apparatus for performing large-scale purification using a cross-flow type microfiltration or ultrafiltration apparatus using river water, lake water, groundwater, seawater, or the like as raw water, circulation is performed to maintain filtration performance. A filtration method is used, and in this type of conventional filtration apparatus, an air bubbling operation for supplying air to the filtration membrane is periodically performed to remove suspended substances accumulated in the filtration membrane.

[0003] A piping for supplying air to each filtration membrane is provided with a restriction orifice for making the flow rate of air supplied to the filtration membrane uniform. FIG. 4A is an explanatory cross-sectional view showing a configuration of a conventional pipe joint for providing an orifice plate 57 having a hole 57a serving as a restriction orifice shown in FIG. 4B. In FIG. 4A, a pipe 51 for flowing air is provided.
Flanges 53 and 54 are fixed to the end of 52 by screwing, welding, or the like.
Packings 55, 56 having an inner diameter larger than the outer diameters of the pipes 51, 52 are disposed on the a, 54a.
As shown in FIG. 4 (b), an orifice plate 57 having a hole 57a having a predetermined size substantially at the center is disposed therebetween.

The flanges 53 and 54 are connected to a plurality of bolts 58
By screwing and tightening the nut 59 and fixing it,
The flange surfaces 53a, 54a of the flanges 53, 54 and the packing 55,
The contact surfaces of the orifice plate 57 and the orifice plate 57 are in close contact with each other to maintain airtightness. When air flows from either direction of the pipes 51 and 52, the flow velocity of the air flowing through the hole 57a of the orifice plate 57 is constant. , And is supplied to the filtration membrane to remove suspended substances accumulated in the filtration membrane by air bubbling.

[0005]

However, in the above-mentioned prior art, two packings 55, 56 are interposed between the two flanges 53, 54, and an orifice plate 57 is further provided between the packings 55, 56. Since a plurality of bolts 58 are inserted into the flanges 53 and 54 and the nuts 59 are screwed into the bolts 58 and fixed, the positioning of the packings 55 and 56 and the orifice plate 57 is troublesome, and the airtightness is stable. It is necessary to fasten the plurality of bolts 58 and nuts 59 substantially evenly in order to obtain the required properties, and this fastening operation is relatively troublesome.

Also, while using the orifice plate for a long time,
When the suspended substance or the like is clogged in the holes 57a of the 57, the orifice plate 57 needs to be replaced, and there is a problem that the replacement work is troublesome for the above-described reason.

Further, since the number of parts is relatively large, there is a problem that the parts cost is high.

[0008] The present invention is to solve the above problems,
It is an object of the present invention to provide a union type restriction orifice which can easily mount and replace the restriction orifice, reduce the number of parts and reduce the cost, and provide a filtering device having the same. .

[0009]

According to the present invention, there is provided a union type restriction orifice in which a plate member having a hole of a predetermined size is formed in a flow passage of a union screw or a union flange. It is characterized by comprising.

A specific configuration of the union type restriction orifice has a plate member formed therein with a hole of a predetermined size serving as a restriction orifice, and has a predetermined inner diameter at one end.
And has an inner wall surface having a predetermined dimension in the axial direction, and has a first screw portion having a predetermined outer diameter on the outer periphery of the inner wall surface provided at the one end portion, and a predetermined screw portion at the other end portion. A union screw having an inner diameter and having a second screw portion screwed to a screw portion formed on an outer periphery of an end portion of the first pipe through which gas or liquid such as air flows, and a union screw at one end portion Has an outer diameter corresponding to the inner diameter of the inner wall surface and has an outer wall surface having a predetermined dimension in the axial direction, and corresponds to the outer diameter of the first thread portion of the union screw adjacent to the outer wall surface. It has an outer diameter and a flange having a predetermined dimension in the axial direction, and has a predetermined inner diameter at the other end, and has an outer periphery at an end of the second pipe through which gas or liquid such as air flows. A union flange having a screw portion to be screwed into the formed screw portion, and fitted to the union flange A union nut having a locking portion that abuts and engages with a flange portion of the union flange at one end portion, and a screw portion that is screwed to a first screw portion of the union screw at the other end portion; A packing having an inner diameter corresponding to the outer diameter of the outer wall surface of the union flange, having an outer diameter corresponding to the outer diameter of the union flange, and having a predetermined width in the axial direction. And

Since the present invention is configured as described above, the union screw and the first pipe are connected by screwing the screw formed at the end of the first pipe to the second thread of the union screw. ,
Further, the union flange is fitted into the union nut, and the screw portion formed at the end of the second pipe is screwed into the thread portion of the union flange to connect the union flange and the second pipe. The outer wall of the union flange is fitted to the outer wall of the union screw, and the union nut is screwed to the first union screw. Together, the union flange and the union screw can be connected to each other via a packing while maintaining airtightness.

That is, the first and second pipes can be connected only by screwing the union nut into the union screw and tightening and fixing the same, and the hole serving as the restriction orifice provided on the union screw side is formed. The flow paths of the first pipe and the second pipe are connected via the first pipe.

When replacing the restriction orifice, after removing the union nut from the union screw, the plate member serving as the restriction orifice is removed from the union screw, or the union screw is removed from the first pipe to replace the restriction orifice. Just do it.

As described above, the work of attaching and replacing the restriction orifice can be easily performed only by the work of attaching and removing the simple screw.

Further, the configuration of the filtering device according to the present invention is such that the two pipes through which the gas and the liquid flow are connected, and the union type restriction orifice for uniformly distributing the gas and the liquid is provided. Features.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a union type restriction orifice according to the present invention and a filtration device provided with the same will be specifically described. FIG. 1 is a sectional explanatory view showing a union type restriction orifice according to the present invention, FIG. 2 is a perspective view showing assembly of the union type restriction orifice according to the present invention, and FIG.
FIG. 3 is a view showing a configuration of a filtration device provided with a union type restriction orifice according to the present invention.

The union type restricting orifice according to the present invention is provided with a gas or liquid such as air supplied to the filtration membrane at the time of air bubbling for removing suspended substances accumulated in the filtration membrane shown in FIG. A union type restriction orifice having a restriction orifice for restricting a flow rate, as shown in FIGS. 1 and 2, through which a gas or liquid such as air flows.
A union screw 3 connected to the pipe 1 to connect the two pipes 1 and 2, a union flange 4 connected to the pipe 2,
It is composed of a union (pipe joint) having a union nut 5 for connecting the union screw 3 and the union flange 4.

The pipes 1 and 2 are made of a stainless steel pipe or the like having a predetermined inner diameter, and threaded portions 1a and 2a are formed on the outer periphery of the ends.

The union screw 3 connected to the pipe 1 is made of stainless steel or the like, and has a nut 3b formed with a screw 3a screwed to the screw 1a of the pipe 1, and is provided adjacent to the nut 3b. An inner wall surface 3c having an inner diameter larger than the diameter of the screw portion 3a, and a screw portion 3d having an outer diameter larger than the outer diameter of the nut portion 3b are formed on the outer periphery of the inner wall surface 3c. .

The inner wall surface 3c is made of a stainless steel plate or the like, which is a plate member having a hole 6a serving as a restriction orifice opened substantially in the center, and a disc 6 having a predetermined thickness is fitted therein. One surface of the disc 6 is disposed in contact with a contact surface 3e formed at a boundary between the screw 3c and the screw portion 3a.

On the inner wall surface 3c, the contact surface 3 of the disc 6
A ring-shaped elastic member 8 made of rubber or the like that can come into contact with a surface opposite to the surface that comes into contact with the front end surface 4e and a front end surface 4e of the union flange 4 described later is fitted. In addition, the elastic member 8 has an outer diameter corresponding to the inner wall surface 3c and is formed of a coil spring, a spring washer, a wave washer, or the like that can abut on the distal end surface 4e of the disc 6 and the union flange 4 in addition to rubber. Is also possible.

As another configuration, the elastic member 8 may be omitted, and the disk 6 may be fixed to the inner wall surface 3c of the union screw 3 with an adhesive that can be easily peeled off.

The union flange 4 connected to the pipe 2 is made of stainless steel or the like, and has a nut part 4b formed with a screw part 4a which is screwed to the screw part 2a of the pipe 2, and a nut part 4b.
b is larger than the outer diameter of the nut portion 4b provided next to
A flange 4c having an outer diameter smaller than the outer diameter of the screw portion 3d of the union screw 3, and an outer having an outer diameter corresponding to the inner diameter of the inner wall surface 3c of the union screw 3 provided adjacent to the flange 4c. It is formed to have a wall surface 4d and a tip surface 4e. Then, the outer wall surface 4d of the union flange 4 is fitted to the inner wall surface 3c of the union screw 3, and the distal end surface 4e abuts against the elastic member 8 to press the elastic member 8, and the union screw 3
The disk 6 fitted to the inner wall surface 3c is supported and fixed.

The union nut 5 is made of stainless steel or the like, and is formed with a screw portion 5a which is screwed with the screw portion 3d of the union screw 3. The union nut 5 is formed at the end of the pipe 2 at the flange 4c of the union flange 4. An engaging portion 5b is provided for abutting engagement. Then, the union nut 5 is fitted to the union flange 4, and the locking portion 5 b of the union nut 5 abuts and engages with the flange portion 4 c of the union flange 4 to lock the screw portion 5 a of the union nut 5. The union screw 3 and the union flange 4 are connected by screwing and fastening to the screw portion 3d of the union screw 3.

The outer periphery of the outer wall surface 4d of the union flange 4 has an inner diameter corresponding to the outer diameter of the outer wall surface 4d of the union flange 4, and an outer diameter corresponding to the outer diameter of the flange portion 4c of the union flange 4. And a packing 7 made of Teflon or the like having a width smaller than the axial dimension of the outer wall surface 4d is fitted.

The screw 5a of the union nut 5 is screwed into the screw 3d of the union screw 3 and fastened. When the union screw 3 and the union flange 4 are connected, the packing 7
Is in close contact with the end face of the union screw 3 and the flange 4c of the union flange 4, so that the union screw 3 and the union flange 4 are connected while maintaining airtightness.

The procedure of assembling the union type restriction orifice A and replacing the restriction orifice will be described in detail. First, the screw portion 1a formed at the end of the pipe 1 is screwed to the screw portion 3a of the union screw 3, and the union screw 3 and the pipe 1 are connected.

Next, a hole 6a serving as a restriction orifice is prepared in advance.
Is inserted into the inner wall surface 3c of the union screw 3 and abuts against the contact surface 3e, and furthermore, the elastic member 8 is inserted into the inner wall surface 3c and the elastic member 8 comes into contact with the disk 6. .

In the case where the elastic member 8 is omitted, the disk 6 fitted on the inner wall surface 3c is fixed to the union screw 3 with an adhesive which can be easily peeled off.

On the other hand, the union flange 4 is fitted into the union nut 5, and the union flange 4 and the pipe 2 are connected by screwing the screw 2 a formed at the end of the pipe 2 to the thread 4 a of the union flange 4. Then, the packing 7 is attached to the outer wall surface 4 of the union flange 4.
d, the outer wall surface 4d of the union flange 4 is fitted to the inner wall surface 3c of the union screw 3, and then the screw portion of the union nut 5 is screwed into the union screw 3. The union flange 4 and the union screw 3 are connected via the packing 7 by being screwed to the portion 3d.

As described above, in the present embodiment, the first and second pipes are connected only by screwing the union nut 5 to the union screw 3 provided with the restricting orifice and fixing it. The pipes 1 and 2 are connected to each other through a hole 6a provided in a disk 6 serving as a restricting orifice. The restricting orifice connects to each filtration membrane shown in FIG. The flow rate of the supplied gas or liquid such as air becomes uniform, and the air bubbling operation for removing suspended substances accumulated in the filtration membrane without giving excessive vibration to the filtration membrane can be performed well.

When replacing the restriction orifice,
After removing the union nut 5 from the union screw 3,
After removing the elastic member 8 from the inner wall surface 3c of the union screw 3, the disk 6 can be removed from the inner wall surface 3c and only the disk 6 can be replaced.

If the elastic member 8 is omitted and the disk 6 is adhered and fixed to the inner wall surface 3c of the union screw 3 with an easily peelable adhesive, the disk 6 can be easily removed from the inner wall surface 3c. And can be replaced.

When the disk 6 is fixed by an adhesive or brazing which cannot be easily peeled off, the union screw 3 is removed from the pipe 1 and the disk 6 and the union screw 3 are integrally replaced. But it is good.

As described above, the work of attaching and replacing the restriction orifice can be easily performed only by attaching and removing the simple screw.
Workability can be improved. The disc 6 is fitted into the inner wall surface 3c of the union screw 3 and positioned by the elastic member 8, and the packing 7 is attached to the outer wall surface 4d of the union flange 4.
As described above, the positioning of the packing and the restricting orifice does not take time, as is the case with the conventional example described above. In this embodiment, as compared with the conventional example which requires fastening, the limited orifice can be assembled only by screwing the union nut 5 to the union screw 3, and the fastening work is facilitated.

The above-mentioned union type restriction orifice according to the present invention can be suitably applied to, for example, a cross-flow type precision or ultrafiltration apparatus which performs filtration while circulating a stock solution. It can be used at the time of air bubbling operation of a filtration membrane of a filtration membrane module composed of a cross-flow type hollow fiber membrane.

Hereinafter, an example of a filter provided with a union type restriction orifice according to the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a configuration of a filtration device provided with a union type restriction orifice according to the present invention.

In FIG. 3, reference numeral 9 denotes a stock solution tank which stores a stock solution 9a to be filtered. In the present embodiment, for example, river water, lake water, groundwater, seawater, or the like is used as the stock solution 9a. A stock solution circulation pump 10 is connected to the downstream side of the stock solution tank 9, and the stock solution 9 a in the stock solution tank 9 is driven by driving the stock solution circulation pump 10.
Is supplied to the pipe 11.

A plurality of filtration membrane modules 12 each formed of a cross-flow type hollow fiber membrane are connected in parallel to the pipe 11, and the stock solution 9a supplied to the filtration membrane module 12 through the pipe 11 is A predetermined pressure is applied by the operation of the undiluted solution circulation pump 10, and the filtration is performed by permeating the hollow fiber membrane of the filtration membrane module 12 from the outside to the inside thereof. After flowing through the inside, it is guided to the filtrate pipe 13 and stored in a filtrate tank (not shown).

On the other hand, the filtration membrane module 12
A part of the undiluted solution 9a supplied to the tank is circulated outside the hollow fiber membrane of the filtration membrane module 12 as the circulating return undiluted solution 9c, guided to the undiluted solution return pipe 14, and returned to the undiluted solution tank 9.

An air bubbling device is provided for the purpose of removing suspended substances accumulated in the filtration membrane of the filtration membrane module 12, and compressed air supplied by a compressor (not shown) is supplied through an air tank (not shown). It is guided to the pipe 2 and supplied from the pipe 1 connected to the upstream side of the filtration membrane module 12 through the above-mentioned union type restriction orifice A, and flows outside the hollow fiber membrane of the filtration membrane module 12 to flow through the hollow fiber membrane. The fibrous membrane is vibrated to remove suspended substances accumulated on the outer surface of the hollow fibrous membrane.

The union type restricting orifices A are provided on the upstream side, one for each filtration membrane module 12, and the air supplied to each union type restricting orifice A is a disk 6 which is a restricting orifice. By flowing through the holes 6a, the flow rate of the air supplied to each filtration membrane module 12 is made constant and uniform at a predetermined flow rate, and the flow rate of the air supplied to each filtration membrane module 12 is not increased without excessive vibration. An air bubbling operation for removing suspended substances accumulated in the filtration membrane can be favorably performed.

In the air bubbling operation, for example, first, in a state where the stock solution 9a is stretched in the filtration membrane module 12, that is, in a state where the stock solution 9a is stationary and stays in the filtration membrane module 12, air or nitrogen gas is supplied. Pressure 2 [kg / cm ² G],
Supply at a flow rate of 5 [Nm ³ / hr] for 60 seconds.

At this time, the secondary side of each filtration membrane module 12 is open, and the primary pressure of the union type restriction orifice A is 0.5 [kg / cm ² G], The side pressure becomes 0 [kg / cm ² G] and ΔP = 5000 [mmAq]
The air or nitrogen gas supplied to the filtration membrane of each filtration membrane module 12 has a uniform flow rate, and air for removing suspended substances accumulated in the filtration membrane without giving excessive vibration to the filtration membrane. Bubbling operation can be performed well.

Thereafter, the undiluted solution 9 is further added to the filtration membrane module 12.
Air or nitrogen gas is supplied for 60 seconds while a is flowing. Then, the above-described series of air bubbling operations is performed once every three days for 120 seconds, and this is periodically repeated.

Then, a stock solution circulating pump is
The recirculating undiluted solution 9c, which is a part of the undiluted solution 9a supplied by the step 10, flows outside the hollow fiber membrane of the filtration membrane module 4, and pushes and discharges the suspended substance peeled off as described above. The recirculated undiluted solution 9c containing the suspended substance is led to the undiluted solution return pipe 14 and stored in the waste liquid tank 15.

Reference numerals 16 to 19 shown in FIG. 3 denote valves for preventing backflow during a filtering operation or an air bubbling operation.

In the above-described embodiment, the case where air or nitrogen gas is used during the air bubbling operation has been described. However, another gas or a liquid such as water is used to filter the membrane module through the union type restriction orifice A. You may be comprised so that the suspended substance accumulate | stored in 12 filtration membranes may be excluded. Also in this case, the flow rate of the liquid such as water supplied to the filtration membrane of each filtration membrane module 12 becomes uniform via the union type restriction orifice A, and accumulates on the filtration membrane without giving excessive vibration to the filtration membrane. The operation for removing the suspended material can be performed well.

In the above-described embodiment, the case where the disc 6 having the hole 6a serving as the restriction orifice is provided on the union screw 3 side is described. However, as another configuration, the disc 6 is provided on the union flange 4 side. Alternatively, it may be configured.

Further, in the above-described embodiment, the case where the disk 6 having the hole 6a serving as the restriction orifice is formed separately from the union screw 3 or the union flange 4 is described. A partition having a hole of a predetermined size serving as a restriction orifice may be integrally provided in the flow path of the union flange 4 or the union flange 4.

[0051]

As described above, the present invention has the above-described structure and operation, so that the work of attaching and replacing the restriction orifice is easy,
In addition, cost can be reduced by reducing the number of parts.

Further, in the filtration device, cleaning by air bubbling can be performed without giving excessive vibration to each filtration membrane.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing a union type restriction orifice according to the present invention.

FIG. 2 is a perspective view showing an assembly of a union type restriction orifice according to the present invention.

FIG. 3 is a diagram showing a configuration of a filtration device provided with a union type restriction orifice according to the present invention.

FIG. 4 is a diagram illustrating a conventional example.

[Explanation of symbols]

 A: Union type restriction orifices 1, 2 ... Piping 1a, 2a ... Screw part 3 ... Union screw 3a ... Screw part 3b ... Nut part 3c ... Inner wall surface 3d ... Screw part 3e ... Contact surface 4 ... Union flange 4a ... Screw part 4b ... Nut part 4c ... Flange part 4d ... Outer wall surface 4e ... Tip surface 5 ... Union nut 5a ... Screw part 5b ... Locking part 6 ... Disc 6a ... Hole 7 ... Packing 8 ... Elastic member 9 ... Stock solution tank 9a ... Stock solution 9b ... Filtrate 10 ... Stock solution circulation pump 11 ... Pipe 12 ... Filtration membrane module 13 ... Filtrate solution pipe 14 ... Stock solution return pipe 15 ... Waste liquid tank 16 ~ 19 ... Valve

Claims (2)

[Claims] 1. A union type restriction orifice, wherein a plate member having a hole of a predetermined size is arranged in a flow path of a union screw or a union flange. 2. The filtering device according to claim 1, further comprising: connecting two pipes through which the gas or the liquid flows, and uniformly distributing the gas or the liquid.