CN103007762B - Ladder water inflowing rolling membrane element of opening water producing runner - Google Patents

Abstract

The invention discloses a stepped water-inflow roll-type membrane element with an open water production channel, which consists of a central tube, a water inlet spacer, a water production spacer and a flat membrane, and the water production spacer is installed on a flat plate folded in half. Between the membranes, the inner side of the end surface of the flat membrane and the upper side of the water separation screen are sealed with a sealant to form a water production unit. The film is sealed to form a roll film, and the two ends of the roll film are respectively provided with a water collection sleeve and a membrane end sealing sleeve, and a membrane shell is provided outside the roll film. The invention has the characteristics of wide effective area, high recovery rate, large water production and anti-pollution.

Description

Ladder-fed water flow membrane element with open product water channel

technical field

The invention relates to a roll-type membrane element, in particular to a step-inlet type roll-type membrane element with an open water production channel.

Background technique

At present, most of the membrane elements used in the existing well water and surface water reverse osmosis systems are coiled membrane elements. It has significant advantages in terms of requirements, investment and operating costs. The existing reverse osmosis membrane elements use plastic mesh as the water inlet channel partition, the purpose of which is to provide a path as close to turbulent flow as possible for the inlet water, so that the inlet water can fully flow between the coiled membranes parallel to the direction of the membrane elements, In the water production flow channel, plastic mesh is used as the water production channel, and the production water flows into the center pipe along the longitudinal direction perpendicular to the membrane element. Most of the coiled membrane elements on the market adopt the way that the product water in the water flow channel is perpendicular to the longitudinal direction of the membrane element and flows in one direction. The product water flows around the membrane element to the central tube and is finally collected by the central tube and directed to the membrane element. The outer product water collection pipe; in the process of flowing to the center pipe, the length of the water product channel is often tens of centimeters to more than one meter long, which causes the product water to encounter relatively large water flow along the plastic grid to the center pipe. Large resistance, the back pressure generated by these resistances affects the output of the permeated water flowing through the membrane to the central tube. The longer the permeated water flow channel, the greater the resistance to the permeated water, and the correspondingly smaller permeated water flow. On the other hand, since the water inlet direction of the traditional membrane element is parallel to the central pipe and flows through the water inlet channel, in order to achieve a high system recovery rate, it is often necessary to connect several branch membrane elements in series, which increases the initial stage of system establishment to a certain extent. The fixed investment, and with the increase of water production, the membrane elements located in the back stage face the risk of high fouling and high fouling due to the decrease of water inflow, and for small systems containing only 1 or 2 membrane elements, it will cause A large amount of waste water is generated and wasted. At the same time, as the recovery rate increases, the flow rate of the feed water in the membrane element will decrease with the increase of the water passing through the membrane, which will increase the risk of fouling and fouling in the membrane element. .

Contents of the invention

The object of the present invention is to provide a stepped water-inflow roll-type membrane element with an open water production channel. The invention has the characteristics of wide effective area, high recovery rate, large water production and anti-pollution.

The technical solution of the present invention: the step-inlet type roll-type membrane element with an open water production flow channel is characterized in that it includes a central tube, a water inlet screen, a water production screen and a flat membrane, and the water production screen is installed on a folded Between the installed flat membranes, the inner side of the end face of the flat membrane and the upper end side of the water separation screen are sealed with sealant to form a water production unit, which is placed on the water intake screen, and then wound around the central tube. Manufactured and sealed to form a roll film, the two ends of the roll film are respectively provided with a water collection sleeve and a membrane end sealing sleeve, and a membrane shell is provided outside the roll film.

In the above-mentioned open water production flow channel stepped water inlet type coiled membrane element, the water inlet grids are arranged in steps in multiple groups. A water production unit composed of mesh and flat membrane.

In the aforementioned step-fed water-flowing roll-type membrane element with an open product water channel, the flat membrane is a reverse osmosis membrane, a nanofiltration membrane or an ultrafiltration membrane.

In the above-mentioned step-fed water-flow membrane element with open water flow channel, the membrane shell includes a cylindrical shell, and the two ends of the shell are respectively provided with a water inlet and a concentrated water collection port, and the side wall of the shell There is a product water collection port on the top, the product water collection sleeve is connected with the product water collection port, and the concentrated water collection port is connected with the central pipe.

In the above-mentioned open permeate flow channel stepped water-inflow type coil membrane element, the permeate collection sleeve is in the shape of a ring, and the inner diameter of the permeate collection sleeve is 1 mm to 3 mm larger than that of the roll membrane, and the external diameter is 1 mm smaller than the internal diameter of the casing. ~2mm; The inner side of the permeated water collection sleeve is sealed with the roll film with sealant, and the outer side of the permeated water collection sleeve is sealed with the inner wall of the shell by a sealing ring.

In the above-mentioned step-inlet type roll-type membrane element with open water production channel, the water production collection sleeve is a ring-shaped rubber sleeve. The inner diameter of the rubber sleeve is smaller than the diameter of the rolled membrane to achieve interference fit. The outer diameter of the rubber sleeve The inner diameter is larger than the housing to achieve an interference fit, and the seal is also guaranteed by using glue or tape between the rubber boot and the roll film.

In the above-mentioned open water flow channel stepped water-inflow type coiled membrane element, the membrane end sealing sleeve is a disc-shaped structure with a hole in the middle, the outer diameter of the membrane end sealing sleeve is larger than the diameter of the roll membrane, and the membrane end sealing sleeve adopts a curved shape. The outer edge of the is used to catch the edge of the film roll.

In the above-mentioned step-fed water-flowing membrane element with open water flow channel, the membrane shell includes a cylindrical shell and a water inlet provided on the shell, and the central positions of the two ends of the shell are respectively provided with concentrated water collectors. mouth and water collection port; the water collection sleeve is a disk-shaped structure with a water production channel in the middle and protruding edges; the water production collection sleeve is fixed at one end of the roll film and sealed with the side wall of the roll film, The end face forms a hollow body, and the end of the central tube in the cavity is provided with a plug, and the water production channel, the cavity body and the water production collection port are connected to each other; the sealing sleeve of the membrane end is sealed with the end surface of the roll membrane, and the center of the sealing sleeve of the membrane end is set. There is a hollow plug, and the hollow plug is arranged in the center pipe and communicated with the concentrated water collection port.

Compared with the prior art, the present invention makes the water flow through the way of glue coating on one side of the water inlet channel, the far end of the product water flow channel relative to the center pipe and the other side of the membrane element relative to the glue coating side of the water inlet channel. The far end of the water flow channel is kept open, so that the feed water surrounds the inlet flow channel of the membrane element with the center tube as the axis and is collected by the center tube. When the feed water flows into the center tube, it flows through the double-folded flat membrane and the product water The water production unit is composed of a screen, and the water production unit is placed in the channel welded with a single or multiple sets of water inlet screens in order of increasing length, so that when the water flows through the water inlet channel, the flow rate of the water inlet does not vary. It will decrease due to permeate permeating the flat membrane. After permeating the membrane, the permeated water flows in the permeated water flow channel parallel to the direction of the central tube to the glue-coated side of the water inlet channel of the membrane element and flows out from the side end surface of the membrane element.

The invention has the following advantages: 1. Influent water flows into the center pipe in a circular manner, which greatly improves the recovery rate of a single membrane element and reduces the waste of influent water; It solves the problem of fouling or fouling caused by a single membrane element achieving a high recovery rate while reducing the flow rate on the membrane surface; 3. The permeated water flows out from the side end face of the membrane element, which greatly reduces the resistance of the permeated water flow channel and improves the 4. By applying glue on one side of the membrane element and placing a sealing sleeve, the sealing problem of the membrane element is solved and the effective membrane area of the membrane element is increased to increase the water production; 5. Through the water collection sleeve The unique design makes the present invention applicable to existing membrane housings and systems on the market.

The present invention adopts a roll-made adhesive sealed water production screen and a flat film, a water production collection sleeve and a membrane shell to control the flow direction of water inflow, so that the water production can directly flow out of the roll film, and a stepped membrane unit is adopted. In the case of high recovery rate (greater than 75%), the risk of fouling and scaling is greatly reduced, and the increase of water production can reach more than 30%.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of water production unit;

Fig. 3 is a structural schematic diagram of a multi-layer water inlet partition;

Fig. 4 is the structural representation in embodiment 2;

Fig. 5 is a schematic diagram of the structure of the product water collection sleeve and the membrane end seal sleeve on the roll membrane.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

Example 1. The stepped water-inflow roll-type membrane element with an open water production channel is composed as shown in Figures 1 and 2, including a central tube 1, a water inlet screen 3, a water production screen 2, and a flat membrane 4. The water production screen 2 Installed between the flat membranes 4 folded in half, the inner side of the end face of the flat membrane 4 and the upper end side of the water separation screen 2 are sealed by a sealant 5 to form a water production unit, which is placed on the water intake screen 3 Then, the central tube 1 is used as the axis to roll and seal to form a roll film 6. The two ends of the roll film 6 are respectively provided with a water collection sleeve 7 and a membrane end sealing sleeve 8. The membrane end sealing sleeve 8 is used to seal the roll film. At one end of 6, a membrane shell is provided outside the roll film 6; a water inlet slit 9 is provided on the roll film 6.

As shown in Figure 3, the water inlet screens 3 are multiple groups, arranged in a ladder shape, each group of water inlet screens is welded by several water inlet screens, and each water inlet screen 3 is equipped with a production water screen. As for the unit, a film shell is arranged outside the roll film 6; the water inlet spacers 3 can also be multiple sheets, arranged in a ladder shape. The specific operation is as follows: Weld several water inlet screens 3 of different lengths in a ladder shape, or fix several water inlet screens of the same length together to form a group, and several groups of water inlet screens 3 of different lengths form a unified The specific length can be calculated according to the influent water volume and the size of the membrane element. The length of each water inlet mesh is superimposed and welded together at a certain distance from long to short. The end of the welded water inlet mesh The length is the same, and the purpose is to keep the speed of the water flow within a certain range as the water volume decreases during the process of the incoming water flowing into the central pipe. After the water inlet screen 3 is fixed, the water production units of different lengths can be inserted between the water inlet screens 3 and sealed, and finally rolled into a roll film 6 .

The flat membrane 4 is a reverse osmosis membrane, a nanofiltration membrane or an ultrafiltration membrane. The central pipe 1, the water-producing screen 2 and the water-inlet screen 3 are mature products and can be purchased from the market. The above-mentioned sealant can adopt existing mature products.

As shown in Figure 1, the membrane shell includes a cylindrical housing 10, the two ends of the housing 10 are respectively provided with a water inlet 11 and a concentrated water collection port 13, and the side wall of the housing 10 is provided with a product water The collection port 12 and the product water collection port 12 can be located close to any end of the concentrated water collection port 13, the product water collection sleeve 7 is connected to the product water collection port 12, and the concentrated water collection port 13 is connected to the central pipe 1.

The water production collection sleeve 7 is annular, and the inner diameter of the water production collection sleeve 7 is 1 mm to 3 mm larger than the roll film, and the outer diameter is 1 mm to 2 mm smaller than the shell inner diameter; It is sealed with a sealant, and the outer side of the produced water collection sleeve 7 is sealed with the inner wall of the housing 10 through a sealing ring.

The permeated water collection sleeve 7 is a ring-shaped rubber sleeve. The inner diameter of the rubber sleeve is smaller than the diameter of the roll film to achieve an interference fit. The outer diameter of the rubber sleeve is greater than the inner diameter of the shell to achieve an interference fit. Glue or tape is used to ensure sealing with the roll film.

The membrane end sealing sleeve 8 is a disk-shaped structure with a hole in the middle, the outer diameter of the membrane end sealing sleeve 8 is larger than the diameter of the roll film 6, and the membrane end seal sleeve 8 adopts a curved outer edge to buckle the edge of the roll film. The hole in the middle is consistent with the diameter of the center pipe 1 and is used for being inserted into the center pipe 1 .

Example 2. The structure of the stepped water-inflow roll-type membrane element with the open water production flow channel is shown in Figures 4 and 5. The structure of the roll film 6 is the same as that of Example 1, and the conventional roll film on the market can also be used.

The membrane shell includes a cylindrical shell 10 and a water inlet 16 provided on the shell 10 (the water inlet 16 can be set at both ends of the non-center position), and the centers of the two ends of the shell 10 are respectively provided with concentrated water Collection port 15 and product water collection port 14, the two ends of the roll film 6 are respectively provided with a product water collection sleeve 7 and a membrane end sealing sleeve 8; Disk-shaped structure; the permeated water collection sleeve 7 is fixed on one end of the roll film 6 and sealed with the side wall of the roll film 6, the permeate water collection sleeve 7 and the end surface of the roll film 6 form a cavity body 17, and the central tube 1 in the cavity body 17 The end is provided with a plug 18, the diameter of the plug 18 is consistent with the inner diameter of the central tube, and the water production channel 19, the cavity body 17 and the water production collection port 14 are connected to each other; A hollow plug 20 is arranged in the center of the sealing sleeve 8 , and the hollow plug 20 is arranged in the central pipe 1 and communicated with the concentrated water collection port 15 . The specific operation is as follows: the length of the central tube 1 is consistent with the length of the cut membrane element, and the end face after cutting is flush with the end face of the central tube 1. When the permeate collection sleeve 7 is installed at one end of the membrane element, the The central plug 18 is embedded in the central tube 1, and the outer diameter of the plug 18 is consistent with the inner diameter of the central tube, so as to ensure that the concentrated water entering the central tube 1 will not flow out from the side of the water production collection sleeve 7, while the water production collection sleeve 7 There are protruding edges on the periphery, which can be stuck on the outer edge of the roll film 6 and sealed by applying glue. After the water production collection sleeve 7 is installed at one end of the roll film, a cavity 17 can be formed with the end face of the roll film. Water production can enter this cavity, and the tubular structure extending from the plug 18 in the center of the water production collection sleeve 7 is consistent with the size of the central tube. There is a water production channel 19 communicating with the cavity structure on the side wall of the tubular structure. After the permeated water enters the cavity 17, it can enter the extension part of the central tube 1 of the permeated water collection sleeve 7 from the permeated water channel 19, so as to realize the derivation of permeated water. And the film end sealing sleeve 8 on the other side also has the protruding edge and can be sealed on the other side of the roll film by a sealant, and in its center is a central tube extension that can be connected with the central tube, and concentrated water flows out from this structure. The structure can be matched with standard membrane casings and systems on the market without separate design, and can be applied to the membrane casing and system of the present invention.

The working principle of the present invention: when working, the water enters the membrane shell from the water inlet of the housing, and due to the constraints of the water production collection sleeve, the water intake can only exist on one side of the water production collection sleeve and from the side of the membrane roll. The water flows into the water inlet channel through the inlet slit, and flows into the roll film around the center tube as the axis, and finally enters the center tube, and flows out of the membrane shell from the concentrated water outlet connected to the center tube. Due to the stepped design of the water inlet channel, it can ensure that the water inlet is within a certain flow rate range. When the feed water flows through the coiled membrane, the product water enters the product water channel through the flat membrane and flows in the product water channel parallel to the central tube to the unsealed direction of the product water channel, and flows out of the coiled membrane and flows out from the product water collection port and is collected stand up.

Claims (8)

1. The stepped water-inflow roll-type membrane element with an open water production flow channel is characterized in that it includes a central tube, a water inlet screen, a water production screen and a flat membrane, and the water production screen is installed on the flat membrane that is folded in half In between, the inner side of the end face of the flat membrane and the upper end side of the water separation screen are sealed by sealant to form a water production unit, which is placed on the water intake screen, and then rolled and sealed with the central tube as the axis A roll film is formed, and the two ends of the roll film are respectively provided with water production collection sleeves and membrane end sealing sleeves, and the outside of the roll film is provided with a membrane shell; the folded edge of the flat film of the water production unit is close to the central tube. 2. According to claim 1, the stepped water-inflow type coiled membrane element with open water-producing flow channel is characterized in that: the water-inlet spacers are arranged in steps in multiple groups, and each group of water-inlet spacers is There are one or more water production units. 3. The step-feeding roll-type membrane element according to claim 1 or 2, characterized in that: the flat membrane is a reverse osmosis membrane, a nanofiltration membrane or an ultrafiltration membrane. 4. According to claim 1, the stepped water-inflow type coiled membrane element with open water production flow channel is characterized in that: the membrane shell includes a cylindrical shell, and the two ends of the shell are respectively provided with a water inlet and a The concentrated water collection port is provided on the side wall of the casing, the produced water collection sleeve is connected with the produced water collection port, and the concentrated water collection port is connected with the central pipe. 5. The stepped water-inflow roll-type membrane element with an open water production channel according to claim 4, characterized in that: the water production collection sleeve is in the shape of a ring, and the inner diameter of the production water collection sleeve is 1 mm to 1 mm larger than the roll membrane. 3mm, the outer diameter is 1mm~2mm smaller than the inner diameter of the shell; the inner side of the water-producing collection sleeve is sealed with the roll film with sealant, and the outer side of the water-producing collection sleeve is sealed with the inner wall of the housing through a sealing ring. 6. The stepped water-inflow roll-type membrane element with an open water production channel according to claim 4, characterized in that: the water production collection sleeve is a ring-shaped rubber sleeve, and the inner diameter of the rubber sleeve is smaller than the diameter of the roll membrane To achieve interference fit, the outer diameter of the rubber sleeve is larger than the inner diameter of the shell to achieve interference fit, and the seal is guaranteed by using glue or tape between the rubber sleeve and the roll film. 7. According to claim 5 or 6, the stepped water-inflow type spiral membrane element with open water production flow channel is characterized in that: the membrane end sealing sleeve is a disk-shaped structure with a hole in the middle, and the outer surface of the membrane end sealing sleeve is The diameter is larger than the roll film diameter, and the film end sealing sleeve adopts a curved outer edge to buckle the edge of the roll film. 8. The stepped water-inflow roll-type membrane element according to claim 1 or 2, characterized in that: the membrane shell includes a cylindrical shell and a water inlet arranged on the shell, Concentrated water collection ports and product water collection ports are respectively provided at the center of both ends of the shell; the product water collection sleeve is a disk-shaped structure with a water production channel in the middle and protruding edges; the product water collection sleeve is fixed at one end of the roll film and connected with the roll film The side wall is sealed, and a cavity is formed between the permeated water collection sleeve and the end face of the roll film. The end of the central tube in the cavity is provided with a plug, and the permeated water channel, the cavity and the permeated water collection port are connected to each other; the membrane end sealing sleeve It is sealed with the end face of the roll film, and the center of the sealing sleeve at the membrane end is provided with a hollow plug. The hollow plug is arranged in the central tube and communicated with the concentrated water collection port.