JPH08252422A - Membrane-type dehumidifier - Google Patents

Abstract

PURPOSE: To provide a membrane-type dehumidifier which can be made more compact. CONSTITUTION: This membrane-type dehumidifier 21 consists of a supply/exhaust block 22 with an intake port 3 and a discharge port 4 of a wet gas which are subdivided by a diaphragm 22a, a body 23, a membrane module 7 of a U bent form and a flow path case 24. A purge passage 30 for supplying a purge gas for dehumidification is provided at a position which is apart horizontally from a port opening direction in the supply/exhaust block, and the diaphragm 22a is thinned by making the ports 3, 4 close to each other. Thus, the length of the supply/exhaust block 22 in the port opening direction is shortened. As the length of the block 22 in the port opening direction is short, the dehumidifier can be made more compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane type dehumidifier.

[0002]

2. Description of the Related Art FIG. 6 to FIG. 8 show an example of a known membrane type dehumidifier.
A body 5, a flow path case 6 and a membrane module 7 that are bent in a substantially U shape, and ring members 8 are provided.
The air supply / exhaust block 2 has an inlet port 3 and an outlet port 4 which are opposed to each other and which are partitioned by a partition wall 2a and open to the lower surface, and axial through holes 9 which individually communicate with the lower surface openings of these ports. , 9 are attached to the lower surface of the air supply / exhaust block 2 by attachment bolts 10, ... (See FIG. 8), and the ring members 8, 8 are appropriately attached to the lower openings of the through holes 9, 9. Installed by means. Further, the flow path case 6 which is formed into a bellows and can be bent,
It is mounted around the lower openings of the through holes 9, 9 by means of mounting rings 11, 11.

The membrane module 7 is constructed by potting a large number of hollow fiber membranes having water vapor permeability near both ends in the longitudinal direction. The high pressure and high humidity air flowing through the large number of hollow fiber membranes. And the low-pressure low-humidity purge air that flows around the hollow fiber membrane and the steam mole fraction difference between the high-pressure and high-humidity air flow out to the purge air side through the hollow fiber membrane to dehumidify the air. It can be bent freely. Further, both ends of the membrane module 7 are
The pottings 13, 13 are attached to the upper openings of the through holes 9, 9 in an airtight manner.

A purge air supply passage 14 for supplying purge air around the hollow fiber membrane between the pottings 13, 13.
Is formed on a line connecting the inlet port 3 and the outlet port 4 of the partition wall 2a, one end of which communicates with the outlet port 4, and the body 5
The other end passing through is communicated with the expanded diameter portion of the through hole 9 by an opening 14a formed in the body 5. Further, in the supply passage 14, an orifice 15 for reducing the pressure of the purge air,
A silencer 16 is incorporated. Through holes 9,9,
The flow path 17 formed by the ring members 8 and 8 and the flow path case 6 has a purge air discharge port 1 formed in the body 5.
8 opens outside the dehumidifier 1.

In the membrane type dehumidifier 1, high-pressure and high-humidity air (see the solid line arrow) supplied from the inlet port 3 and flowing in the hollow fiber membrane is passed around the hollow fiber membrane through the purge air supply passage 14. It is dehumidified by low-pressure low-humidity purge air (see the dotted line arrow) flowing through the air. Most of the dehumidified air is supplied from the outlet port 4 to a desired fluid pressure device (not shown), and a part of the air is purged. Is supplied as purge air around the hollow fiber membrane. In this case, since the membrane module 7 is potted 13 and 13 near both ends of the hollow fiber membrane, the high-pressure and high-humidity air flowing inside the hollow fiber membrane and the low-pressure and low-humidity purge air flowing around the hollow fiber membrane are formed. Do not mix.

This membrane type dehumidifier 1 is constructed by bending the membrane module 7 and the flow path case 6 into a substantially U shape.
Although it can be made compact as compared with those having a straight shape, the purge air supply passage 14 has a partition wall 2a.
2a because it is formed between the ports 3 and 4 of
Since it is not possible to reduce the thickness, it is difficult to shorten the length of the supply / exhaust block 2 in the opening direction of the port, and therefore there is a limit to making the dehumidifier 1 compact. Since the length of the screw for screwing the pipes to the ports 3 and 4 and the diameter of the membrane module 7 are determined by the supply amount of the dehumidified air per unit time, the length of the air supply / exhaust block 2 in the port opening direction. In order to make the dehumidifier more compact by shortening the length, it is important to thin the partition wall 2a.

[0007]

The problem to be solved by the present invention is to provide a membrane dehumidifier which can be made more compact.

[0008]

In order to solve the above-mentioned problems, the membrane type dehumidifier of the present invention has an inlet port and an outlet port for the gas to be dehumidified, which are open to the back, and a partition wall for partitioning these ports. A supply / exhaust block having a plurality of hollow fiber membranes, a membrane module in which a large number of hollow fiber membranes are potted near both ends, and a flow channel case that covers the membrane module. Attached to the air supply / exhaust block, both ends of the membrane module are individually communicated with the ports, and the high-pressure high-humidity dehumidified gas flowing in the hollow fiber membrane is a low-pressure low-humidity purge gas flowing around the hollow fiber membrane between the pottings. In a membrane dehumidifier that dehumidifies by means of a dehumidifier, one end of the purge gas supply passage opens around the hollow fiber membrane between the potting and the other end of the potting. It is characterized in that provided at a distance laterally from the opening direction of the ports.

In order to solve the same problem, the dehumidifier has a body mounted on the air supply / exhaust block by mounting bolts screwed into a plurality of mounting holes, and one or a plurality of mounting holes. It is characterized in that a purge gas supply passage is formed by a mounting bolt.

Further, in order to solve the same problem, the mounting bolt forming the supply passage for the purge gas is provided with an orifice for reducing the pressure of the purge gas.

[0011]

The high-pressure and high-humidity dehumidified gas supplied from the inlet port to the membrane dehumidifier flows in the hollow fiber membrane of the membrane module bent in a substantially U shape, and flows around the hollow fiber membrane. It is dehumidified by the difference in the water vapor mole fraction from the flowing low-pressure low-humidity purge gas to become a dry gas, which is supplied from the outlet port to a desired fluid pressure device. Further, a part of the dehumidified gas passes through the purge gas supply passage and is supplied as a purge gas around the hollow fiber membrane between the pottings.

In this case, the purge gas supply passages are provided at positions laterally separated from the opening positions of the inlet port and the outlet port, which are opened to face each other, so that the partition wall for partitioning these ports is made thin. Because you can
The length of the air supply / exhaust block in the port opening direction can be shortened, whereby the membrane dehumidifier can be made more compact.

Further, since the mounting hole for mounting the body to the air supply / exhaust block is used as the supply passage for the purge gas, it is not necessary to provide a separate supply passage for the air supply / exhaust block and the body, so that these structures are simple. . Further, since the mounting bolt is provided with the orifice for depressurizing the purge gas, the number of parts is reduced and there is no work to install the orifice, so that the dehumidifier can be made inexpensive.

[0014]

1 to 5 show an embodiment of the present invention in which a membrane type dehumidifier 21 includes an air supply / exhaust block 22 and a body 2.
3, the flow path case 24 and the membrane module 7 that are bent in a substantially U shape, and the ring members 8 and 8. The air supply / exhaust block 22 has an inlet port 3 and an outlet port 4 which are opposed to each other and which are partitioned by a partition wall 22a and open to the lower surface, and axial through holes 9 which individually communicate with the lower surface openings of these ports. , 9 has a mounting bolt 2 having a tip screwed into an axial mounting hole 26 formed in the body and the air supply / exhaust block 22.
It is attached to the lower surface of the air supply / exhaust block 22 by 7, ... And 28 (see FIG. 3).
.. are provided at positions laterally separated from the opening direction of the ports 3 and 4 in the air supply / exhaust block 22 as shown in FIG. A supply pipe and a discharge pipe (both not shown) for the dehumidified gas are screwed into the ports 3 and 4.

The ring members 8 and 8 are mounted in the lower openings of the through holes 9 and 9 by appropriate means, and the flow path case 24 which is formed into a bellows and is bendable is penetrated by the mounting rings 11 and 11. It is mounted around the lower openings of the holes 9, 9. Also, the through holes 9, 9 and the ring members 8, 8
Both ends of the membrane module 7 passing through the flow path case 24 are airtightly attached to the upper openings of the through holes 9, 9 by the potting 13, 13 as in the known dehumidifier 1.
The membrane module 7 has the same structure as the membrane module of the known dehumidifier 1 and has the same dehumidifying action.

The purge gas supply passage 30 for supplying purge air around the hollow fiber membranes in the membrane module 7 comprises:
One end communicates with the outlet port 4 via the port 30a, and the other end passing through one of the mounting holes 26 communicates with the through hole 9 on the flow channel case side of the potting 13, 13 of the membrane module 7 via the port 30b ( 1 and 5
reference). The tip of the substantially U-shaped flow path 32 around the hollow fiber membrane is provided with a purge gas discharge port 33 formed in the body 23.
(See FIG. 5) opens outside the dehumidifier 21.

The mounting bolt 28 has a recess 35 formed at its tip and a radial orifice 36 communicating with the recess 35 (see FIG. 4). The recess 35 and the orifice 36 and the periphery of the reduced diameter portion of the mounting bolt 28. A space between the mounting hole 26 and the mounting hole 26 forms a purge gas supply passage 30.
Of course, the opening of the mounting hole 26 into which the mounting bolt 28 is screwed is sealed by an appropriate means.

In the above embodiment, the through holes 9, 9 of the body 23 are used.
The ring members 8 and 8 are mounted in the lower opening of the membrane module by appropriate means, and both ends of the membrane module whose both ends are potted 13 and 13 are connected to the upper openings of the through holes 9 and 9 of the body 23 by the potting 13 and 13, respectively. The flow path case 24 is attached to the lower part of the opening of the through hole by the attachment rings 11 and 11, respectively, and the body 23 is attached to the lower surface of the air supply / exhaust block 22 by the attachment bolts 27, ... The outer peripheral surfaces of both ends of the module 7 are hermetically sealed by the packings 12, 12, and both ends of the purge gas supply passage 30 communicate with the outlet port 4 and the enlarged diameter portion of the through hole 9.

In this case, one of the mounting holes 26 provided laterally away from the opening positions of the ports 3 and 4 is used as the purge gas supply passage 30, so that the partition wall 22a is thinned and the ports 3 and 4 are provided. Can be made as close to each other as possible, so that the length of the air supply / exhaust block 22 in the port opening direction can be shortened, whereby the membrane dehumidifier 21 can be made more compact. Further, since the membrane module 7 and the flow path case 24 are both bendable, even if the length of the air supply / exhaust block 22 in the port opening direction is shortened, they are not hindered from being attached. Further, since the mounting bolt 28 is provided with the orifice 36, the orifice formed separately is replaced with the purge passage 30.
Since it is not necessary to assemble the membrane dehumidifier 21, the number of parts is reduced and the assembly work is reduced, so that the membrane dehumidifier 21 can be made inexpensive.

In the dehumidifier 21, the high-pressure and high-humidity air (see the solid arrow) supplied from the inlet port 3 flows through the hollow fiber membrane of the membrane module 7 while the purge air flows around the hollow fiber membrane. (Refer to the dotted line arrow) Dehumidified to dry air due to the difference in water vapor mole fraction, and is supplied from the outlet port 4 to a desired fluid pressure device (not shown). Also, a part of the dried air passes through the purge gas supply passage 30 from the port 30a, is decompressed by the orifice 36 in the passage, and is then supplied as purge air around the hollow fiber membrane from the port 30b, and the flow passage 32 is formed. While flowing through the air, it becomes moist air due to the moisture of the high-pressure and high-humidity air and is discharged from the discharge port 33 to the outside of the dehumidifier 21. In this case, since the flow directions of the high-pressure high-humidity air and the low-pressure low-humidity purge air are opposite, the dehumidification efficiency is good.

In the above embodiment, the gas to be dehumidified is air for convenience of explanation, but the gas dehumidified by the membrane dehumidifier 21 of the present invention is not limited to air, and gases other than air may be used. It includes. In addition, the above embodiment,
Although the single mounting hole 26 and the mounting bolt 28 form the purge gas supply passage 30, if necessary, a plurality of mounting holes and the mounting bolt can form the purge gas supply passage.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a main part.

5 is a sectional view taken along line CC of FIG.

6 is a cross-sectional view taken along line DD of FIG.

FIG. 7 is a plan view of a known membrane dehumidifier.

8 is a sectional view taken along line EE of FIG.

[Explanation of symbols]

 3 Inlet port 4 Outlet port 7 Membrane module 13 Potting 21 Membrane dehumidifier 22 Air supply / exhaust block 22a Partition wall 23 Body 24 Flow path case 26 Mounting hole 28 Mounting bolt 30 Supply passage 36 Orifice

Claims (3)

[Claims] 1. A supply / exhaust block having an inlet port and an outlet port for a gas to be dehumidified, which are open to the back of each other, and partition walls partitioning these ports, and a membrane module in which a large number of hollow fiber membranes are potted near both ends. And a channel case covering the membrane module, the membrane module and channel case bent in a substantially U shape are attached to the air supply / exhaust block so that both ends of the membrane module are individually communicated with the port, In the membrane dehumidifier for dehumidifying the high-pressure high-humidity dehumidified gas flowing in the hollow fiber membrane by the low-pressure low-humidity purge gas flowing around the hollow fiber membrane between the pottings, one end is between the outlet port and the other end is between the pottings. A purge gas supply passage opening around the hollow fiber membrane is provided at a position laterally separated from the opening direction of the inlet port and the outlet port. Membrane type dehumidifier. 2. A body mounted on the air supply / exhaust block by mounting bolts screwed into a plurality of mounting holes,
The membrane type dehumidifier according to claim 1, wherein the purge gas supply passage is formed by one or a plurality of mounting holes and mounting bolts. 3. An attachment bolt forming a purge gas supply passage is provided with an orifice for reducing the pressure of the purge gas.
The membrane type dehumidifier according to claim 2, wherein