CN118387986B - Reverse osmosis industrial water purifier with changeable working mode - Google Patents

Abstract

The invention belongs to the technical field of reverse osmosis industrial water purifiers, and particularly relates to a reverse osmosis industrial water purifier with a variable working mode, which comprises a raw water tank, a booster pump, a sand filter, a carbon filter, a softener, a precision filter, a high-pressure pump, reverse osmosis equipment and a pure water tank, wherein the sand filter, the carbon filter and the softener have the same structure, and the reverse osmosis equipment consists of a plurality of reverse osmosis components which are connected in parallel. The reverse osmosis layer of the reverse osmosis unit in the reverse osmosis equipment is provided with a two-stage osmosis structure, raw water can be purified more effectively, meanwhile, a first supporting layer between the two-stage osmosis structure in the reverse osmosis layer can be deformed properly under the action of backwash pressure pulsation to scrape and clean crystals attached to the raw water side of the first-stage reverse osmosis membrane, the crystals separated from the first-stage reverse osmosis membrane are discharged under the drive of backwash pure water, the backwash capacity of the reverse osmosis equipment is improved, the service life of the reverse osmosis equipment is prolonged, the replacement period is prolonged, and the equipment maintenance cost is reduced.

Description

A reverse osmosis industrial pure water machine with variable working mode

Technical Field

The invention belongs to the technical field of reverse osmosis industrial pure water machines, and in particular relates to a reverse osmosis industrial pure water machine with a variable working mode.

Background Art

Reverse osmosis industrial pure water machine is a device that uses reverse osmosis technology for water treatment. Reverse osmosis is a physical process that applies a pressure greater than the osmotic pressure on the concentrated solution side, causing the solvent (water) of the concentrated solution to flow to the dilute solution side, thereby achieving separation of water and impurities.

The reverse osmosis industrial pure water machine includes a water pretreatment system (sand filter, carbon filter and softener), a high-pressure pump, and a reverse osmosis device. The pretreatment system is used to remove large particle impurities and hard ions in the raw water. The high-pressure pump is used to pressurize and transport the pretreated raw water to the reverse osmosis device. The reverse osmosis membrane in the reverse osmosis device is made of polymer materials, which has good chemical corrosion resistance and mechanical strength. It can effectively block most of the impurities such as soluble salts, organic matter and microorganisms without forming a barrier to water.

The existing reverse osmosis industrial pure water machine still has the following problems to be solved during use:

For reverse osmosis equipment, it has a certain backwashing ability after being used for a period of time. The service life of the reverse osmosis membrane is extended by backwashing. However, crystals will be attached to the raw water side of the reverse osmosis membrane due to long-term use. These crystals cannot be cleaned by backwashing. When the crystals accumulate to a certain thickness, it will affect the pure water production rate of the reverse osmosis membrane. At this time, a new filter element needs to be replaced, which increases the cost. Therefore, how to remove the crystals attached to the raw water side of the reverse osmosis membrane through backwashing needs to be studied and solved.

The present invention designs a reverse osmosis industrial pure water machine with variable working mode to solve the above problems.

Summary of the invention

Based on this, it is necessary to provide a reverse osmosis industrial pure water machine with a variable working mode to address the problems existing in the current reverse osmosis industrial pure water machine. The sand filter, carbon filter and softener in the raw water pretreatment system of the present invention all adopt a three-layer small filter tank structure to pretreat the water layer by layer, and all three layers of small filter tanks are involved in production. In the actual water pretreatment process, only the small filter tanks on the upper two layers pretreat the water, and the water reaching the small filter tanks on the bottom layer has basically met the requirements without the need for the small filter tanks on the bottom layer to participate in the filtration. Therefore, when replacing any one layer of the filter tanks, the other two layers of filter tanks can fully meet the pretreatment of the water and still maintain the pretreatment flow rate unchanged, thereby ensuring that the production efficiency of the entire equipment is not affected.

The reverse osmosis layer of the reverse osmosis unit in the reverse osmosis equipment has a two-stage osmosis structure, which can purify the raw water more effectively. At the same time, the first support layer between the two-stage osmosis structure in the reverse osmosis layer can be appropriately deformed under the action of the backwash pressure pulsation to scrape and clean the crystals attached to the raw water side of the first-stage reverse osmosis membrane. The crystals separated from the first-stage reverse osmosis membrane are discharged under the drive of the backwash pure water, thereby improving the backwash capacity of the reverse osmosis equipment, extending its service life, extending the replacement cycle, and reducing the equipment maintenance cost.

The above purpose is achieved through the following technical solutions:

A reverse osmosis industrial pure water machine with a variable working mode comprises a raw water tank, a booster pump, a sand filter, a carbon filter, a softener, a precision filter, a high-pressure pump, a reverse osmosis device and a pure water tank, wherein the sand filter, the carbon filter and the softener have the same structure, the reverse osmosis device is composed of a plurality of reverse osmosis components connected in parallel, the reverse osmosis component comprises a cylinder, a plurality of reverse osmosis units connected in series are arranged in the cylinder, the reverse osmosis unit comprises an inner tube, a first water inlet is provided on the tube wall of the inner tube, an outer tube is sleeved outside the inner tube, a second water inlet opposite to the first water inlet is provided on the tube wall of the outer tube, the width of the second water inlet is greater than that of the first water inlet, a reverse osmosis layer is arranged at the second water inlet, the reverse osmosis layer is vortexed and wound on the outer tube, the reverse osmosis layer is wrapped with an outer sheath, and the outer sheath is in close contact with the inner wall of the cylinder.

The reverse osmosis layer comprises two primary membrane layers and two secondary reverse osmosis membranes, the two primary membrane layers are respectively bonded to the two circumferential edges of the second water inlet, the two secondary reverse osmosis membranes are respectively bonded to the two circumferential edges of the first water inlet, the axial ends of the two secondary reverse osmosis membranes are sealed with glue seals, the outer side of the primary membrane layer is sealed with an impermeable membrane that seals the radial ends of the primary membrane layer and the secondary reverse osmosis membrane, a first supporting layer is provided between the impermeable membrane and the primary membrane layer, a second supporting layer is provided between the secondary reverse osmosis membrane and the primary membrane layer on the same side, and the axial ends of the second supporting layer are sealed;

The inner and outer tubes of the reverse osmosis unit at the water inlet end are capped by end caps.

In one embodiment, the sand filter has three layers of filtering structures for pre-treating raw water from top to bottom, each layer of the filtering structures is connected in parallel with a first main pipe, and the first main pipe is provided with three second switch valves for switching raw water between the first main pipe and each layer of the filtering structures. Each layer of the filtering structure is composed of six parallel filter tanks, and both ends of the filter tanks are connected to the pipeline through flanges, and the pipelines connecting the two ends of the filter tanks are provided with first switch valves.

In one of the embodiments, a hoop is installed on the outside of the filter tank, a support is provided on the hoop, and the support is connected to the first bracket by bolts.

In one embodiment, the water inlet end of the cylinder has a third water inlet, and the water outlet end of the cylinder is provided with a wastewater pipe and a secondary pure pipe, the end of the secondary pure pipe is closed and located at the center of the end face of the cylinder, and the wall of the secondary pure pipe has a water outlet, the secondary pure pipe is connected to the outer pipe of the reverse osmosis unit at the water outlet end, and a pure water pipe connected to the cylinder is provided inside the secondary pure pipe, and the pure water pipe is connected to the inner pipe of the reverse osmosis unit at the water outlet end.

In one of the embodiments, the pure water pipe is connected to the pure water tank through a third main pipe, and the third water inlet is connected to a high-pressure pump.

In one embodiment, the water outlet is connected to the fourth main pipe, and the waste water pipe is connected to the fifth main pipe.

In one embodiment, the primary membrane layer is composed of a plurality of primary reverse osmosis membranes connected by elastic membranes.

In one embodiment, the first supporting layer is composed of elastic rhombus-shaped tubes connected side by side.

In one embodiment, the outer tube and the inner tube are supported and connected by a support plate.

In one embodiment, the reverse osmosis device is fixed to the ground via a second bracket.

The beneficial effects of the present invention are as follows: the reverse osmosis layer of the reverse osmosis unit in the reverse osmosis equipment has a two-stage osmosis structure, which can purify raw water more effectively. At the same time, the first support layer between the two-stage osmosis structure in the reverse osmosis layer can be appropriately deformed under the action of backwashing pressure pulsation to scrape and clean the crystals attached to the raw water side of the first-stage reverse osmosis membrane, and the crystals separated from the first-stage reverse osmosis membrane are discharged under the drive of backwashing pure water, thereby improving the backwashing capacity of the reverse osmosis equipment, extending its service life, extending the replacement cycle, and reducing the equipment maintenance cost.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is an overall schematic diagram of the present invention;

Fig. 2 is a schematic diagram of a sand filter in the present invention;

FIG3 is a side cross-sectional schematic diagram of a sand filter in the present invention;

FIG4 is a partial cross-sectional schematic diagram of the sand filter of the present invention;

FIG5 is a schematic top cross-sectional view of a sand filter according to the present invention;

FIG6 is a schematic diagram of a reverse osmosis device in the present invention;

FIG7 is a schematic diagram of a reverse osmosis unit of a reverse osmosis device in the present invention;

8 is a schematic cross-sectional view of a reverse osmosis unit of a reverse osmosis device according to the present invention;

9 is a schematic cross-sectional view of the reverse osmosis unit of the reverse osmosis device of the present invention;

10 is a partial cross-sectional schematic diagram of the reverse osmosis layer of the reverse osmosis unit of the present invention;

FIG11 is a schematic diagram of the inner tube and outer tube of the reverse osmosis unit of the present invention;

FIG12 is a reverse osmosis assembly and a cross-sectional schematic diagram thereof in the present invention;

13 is a schematic cross-sectional view of the water inlet structure of the reverse osmosis assembly of the present invention;

14 is a schematic cross-sectional view of the water outlet structure of the reverse osmosis assembly of the present invention;

15 is a schematic diagram of the movement state of raw water in the reverse osmosis unit of the present invention;

FIG16 is a schematic diagram of the primary membrane structure of the present invention;

Name of the label in the figure:

101. Raw water tank; 102. Booster pump; 103. Precision filter; 104. High pressure pump; 105. Pure water tank;

200, sand filter; 201, first bracket; 202, filter tank; 203, hoop; 204, support; 205, bolt; 206, first switch valve; 207, first main pipe; 208, second switch valve;

300, carbon filter; 400, softener;

500, reverse osmosis equipment; 501, second bracket; 502, reverse osmosis assembly; 503, cylinder; 504, third water inlet; 505, waste water pipe; 506, sub-pure pipe; 507, water outlet; 508, pure water pipe; 509, reverse osmosis unit; 510, inner pipe; 511, first water inlet; 512, support plate; 513, outer pipe; 514, second water inlet; 515, reverse osmosis layer; 516, impermeable membrane; 517, primary membrane layer; 5171, primary reverse osmosis membrane; 5172, elastic membrane; 518, secondary reverse osmosis membrane; 519, first supporting layer; 520, second supporting layer; 521, glue seal; 522, outer sleeve; 523, end cover; 524, second main pipe; 525, third main pipe; 526, fourth main pipe; 527, fifth main pipe;

600. Cushion layer.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

As shown in FIG1-16, a reverse osmosis industrial pure water machine with a variable working mode includes a raw water tank 101, a booster pump 102, a sand filter 200, a carbon filter 300, a softener 400, a precision filter 103, a high-pressure pump 104, a reverse osmosis device 500 and a pure water tank 105. The sand filter 200, the carbon filter 300 and the softener 400 have the same structure. The reverse osmosis device 500 includes a plurality of reverse osmosis components 502 connected in parallel. The reverse osmosis component 502 includes a cylinder 503. The cylinder 503 is provided with a plurality of reverse osmosis units 509 connected in series. The permeability unit 509 includes an inner tube 510, a first water inlet 511 is provided on the tube wall of the inner tube 510, an outer tube 513 is mounted outside the inner tube 510, a second water inlet 514 opposite to the first water inlet 511 is provided on the tube wall of the outer tube 513, the width of the second water inlet 514 is greater than the width of the first water inlet 511, a reverse osmosis layer 515 is provided at the second water inlet 514, the reverse osmosis layer 515 is spirally wound around the outer tube 513, the reverse osmosis layer 515 is wrapped with an outer sheath 522, and the outer sheath 522 is in close contact with the inner wall of the cylinder 503.

The reverse osmosis layer 515 includes two primary membrane layers 517 and two secondary reverse osmosis membranes 518, the two primary membrane layers 517 are respectively bonded to the two circumferential edges of the second water inlet 514, the two secondary reverse osmosis membranes 518 are respectively bonded to the two circumferential edges of the first water inlet 511, the axial ends of the two secondary reverse osmosis membranes 518 are sealed with glue seals 521, the outer side of the primary membrane layer 517 is sealed with an impermeable membrane 516 for sealing the radial ends of the primary membrane layer 517 and the secondary reverse osmosis membrane 518, a second support layer 520 is arranged between the secondary reverse osmosis membrane 518 and the primary membrane layer 517 on the same side, the axial ends of the second support layer 520 are sealed with glue seals 521, and a first support layer 519 is arranged between the impermeable membrane 516 and the primary membrane layer 517.

The inner tube 510 and the outer tube 513 of the reverse osmosis unit 509 at the water inlet end are capped by end caps 523 , as shown in FIG. 13 .

The sand filter 200, carbon filter 300 and softener 400 in the raw water pretreatment system all adopt a three-layer filter structure to pretreat the water layer by layer, and all three-layer filter structures are involved in the production. In the actual water pretreatment process, only the upper two layers of the filter structure pretreat the water, and the water reaching the bottom filter structure has basically met the requirements without the need for the bottom filter structure to participate in the filtration. Therefore, when any one of the filter structures is replaced, the other two layers of the filter structure can fully meet the water pretreatment requirements while still maintaining the pretreatment flow rate unchanged, thereby ensuring that the production efficiency of the entire equipment is not affected.

The reverse osmosis layer 515 of the reverse osmosis unit 509 in the reverse osmosis equipment 500 has a two-stage osmosis structure, which can purify the raw water more effectively. At the same time, the first support layer 519 between the two-stage osmosis structure in the reverse osmosis layer 515 can be appropriately deformed under the action of the backwash pressure pulsation to scrape and clean the crystals attached to the raw water side of the first-stage reverse osmosis membrane 5171. The crystals separated from the first-stage reverse osmosis membrane 5171 are discharged under the drive of the backwash pure water, thereby improving the backwash capacity of the reverse osmosis equipment 500, extending its service life, extending the replacement cycle, and reducing the equipment maintenance cost.

The thickness of the above-mentioned reverse osmosis layer is extremely thin, and the reverse osmosis layer in Figures 8, 9, 10, and 15 is only for highlighting the schematic representation of its structural characteristics.

In a further embodiment, as shown in Figures 2, 3, and 4, the sand filter 200, the carbon filter 300, and the softener 400 all have three layers of filtering structures for pre-treating raw water from top to bottom, and each layer of the filtering structure is connected in parallel with the first main pipe 207. The first main pipe 207 is provided with three second switch valves 208 for switching raw water between the first main pipe 207 and each layer of the filtering structure. Each layer of the filtering structure includes six parallel filter tanks 202, and both ends of the filter tank 202 are connected to the pipeline through flanges. The pipelines connecting the two ends of the filter tank 202 are provided with first switch valves 206.

In a further embodiment, as shown in FIGS. 4 and 5 , a hoop 203 is installed on the outside of the filter tank 202 , a support 204 is provided on the hoop 203 , and the support 204 is connected to the first bracket 201 via bolts 205 .

In a further embodiment, as shown in Figures 12, 13, and 14, the water inlet end of the cylinder 503 has a third water inlet 504, and the water outlet end of the cylinder 503 is provided with a wastewater pipe 505 and a secondary pure pipe 506, the end of the secondary pure pipe 506 is closed and located at the center of the end face of the cylinder 503, and the tube wall of the secondary pure pipe 506 has a water outlet 507, the secondary pure pipe 506 is connected to the outer tube 513 of the reverse osmosis unit 509 located at the water outlet end, and a pure water pipe 508 connected to the cylinder 503 is provided in the secondary pure pipe 506, and the pure water pipe 508 is connected to the inner tube 510 of the reverse osmosis unit 509 located at the water outlet end.

In a further embodiment, as shown in FIGS. 1 and 6 , the pure water pipe 508 is connected to the pure water tank 105 through the third main pipe 525 , and the third water inlet 504 is connected to the high-pressure pump 104 .

In a further embodiment, as shown in FIGS. 1 and 6 , the water outlet 507 is connected to the fourth main pipe 526 , and the waste water pipe 505 is connected to the fifth main pipe 527 .

In a further embodiment, as shown in FIG. 9 , the primary membrane layer 517 includes a plurality of primary reverse osmosis membranes 5171 connected by elastic membranes 5172 .

In a further embodiment, as shown in FIGS. 9 and 10 , the first supporting layer 519 is composed of elastic rhombus-shaped cylinders connected side by side.

In a further embodiment, as shown in Figs. 8 and 9, the outer tube 513 and the inner tube 510 are supported and connected by a support plate 512. Fig. 8 has a cushion layer, and during the winding process of the reverse osmosis layer 515, the cushion layer is required to support the reverse osmosis layer 515 of the first winding circle, so that the reverse osmosis layer 515 of the second winding circle is smoother. The material of the cushion layer can be selected from corrosion-resistant materials that can be used for a long time in the equipment.

In a further embodiment, as shown in FIG. 6 , the reverse osmosis device 500 is fixed to the ground via a second bracket 501 .

In a further embodiment, the pore size of the primary reverse osmosis membrane is the same as that of the secondary reverse osmosis membrane, or the pore size of the primary reverse osmosis membrane is slightly larger than that of the secondary reverse osmosis membrane.

The operation process of the present invention is as follows:

The sand filter 200, carbon filter 300 and softener 400 in the raw water pretreatment system all adopt a three-layer filter structure to pretreat the water layer by layer, and all three layers of the filter structure are involved in the production. In the actual raw water pretreatment process, only the upper two layers of the filter structure pretreat the water, and the water reaching the bottom filter structure has basically met the requirements without the need for the bottom filter structure to participate in the filtration. Therefore, when any one layer of the filter structure is replaced, the other two layers of the filter structure can fully meet the water pretreatment requirements while still maintaining the pretreatment flow rate unchanged, thereby ensuring that the production efficiency of the entire equipment is not affected.

When the three-layer filtration structure participates in the pretreatment of raw water at the same time, the three second switch valves 208 on the first main pipe are all in a closed state, and the first switch valves 206 at both ends of each filter tank 202 are all in an open state. When it is necessary to replace the filter tank 202 of any layer, first open the second switch valve 208 on the first main pipe 207 corresponding to the filter tank 202 of the layer, and then close the first switch valves 206 at both ends of each filter tank 202 in the layer, so that the connection between the filter tank 202 of the layer and the pipeline is cut off and the switching between the first main pipe 207 and the filter tank 202 of the layer is completed. Then, remove the filter tank 202 of the layer and replace it with a new filter tank 202. After the replacement is completed, open the first switch valves 206 at both ends of the filter tank 202 of the layer, and then close the second switch valve 208 corresponding to the filter tank 202 of the layer, so as to complete the connection of the new filter tank 202.

The reverse osmosis layer 515 of the reverse osmosis unit 509 in the reverse osmosis equipment 500 has a two-stage osmosis structure, which can purify the raw water more effectively. At the same time, the first support layer 519 between the two-stage osmosis structure in the reverse osmosis layer 515 can be appropriately deformed under the action of the backwash pressure pulsation to scrape and clean the crystals attached to the raw water side of the first-stage reverse osmosis membrane 5171. The crystals separated from the first-stage reverse osmosis membrane 5171 are discharged under the drive of the backwash pure water, thereby improving the backwash capacity of the reverse osmosis equipment 500, extending its service life, extending the replacement cycle, and reducing the equipment maintenance cost.

As shown in FIG. 16 , after the high-pressure raw water from the high-pressure pump 104 enters the cylinder 503 from the third water inlet 504 of the reverse osmosis component 502, the high-pressure raw water enters the two first support layers 519 of the reverse osmosis layer 515 of the reverse osmosis unit 509 and moves axially toward the water outlet. The high-pressure raw water passing through the first support layer 519 passes through the primary membrane layer 517 under pressure and enters the second support layer 520 to form sub-pure water and complete the first-stage purification. The larger impurities in the raw water are blocked on the outside of the primary membrane layer 517. Part of the sub-pure water entering the second supporting layer 520 enters the outer tube 513 through the second water inlet 514 and flows to the fourth main pipe 526 for recovery and reprocessing, and part of it enters the space between the two secondary reverse osmosis membranes 518 through the secondary reverse osmosis membrane 518 and enters the inner tube 510 through the first water inlet 511, thereby completing the purification of the raw water. The impurities in the sub-pure water are blocked on the outside of the secondary reverse osmosis membrane 518, and the pure water entering the inner tube 510 enters the pure water tank 105 through the pure water pipe 508 and the third main pipe 525.

As time goes by, crystals will accumulate on the outside of the primary membrane layer 517, which will block the primary membrane layer 517 and affect the water purification efficiency of the primary membrane layer 517. At this time, the fourth main pipe 526 and the fifth main pipe 527 are closed, and high-pressure pure water is added to the reverse osmosis component 502 through the third main pipe 525. The high-pressure pure water enters the inner pipe 510 of the reverse osmosis unit 509 and goes out in reverse order through the secondary reverse osmosis membrane 518, the second support layer 520, the primary membrane layer 517, the first support layer 519 and the third water inlet 504 under the action of pressure. In the process of pure water passing through the primary membrane layer 517, the pressure pressurized for the pure water pulsates. Since the primary membrane layer 517 is composed of a plurality of primary reverse osmosis membranes 5171 connected by elastic membranes 5172, the function of the elastic membranes 5172 is to deform the primary membrane layer 5172 so that the primary membrane layer 5 17 as a whole can be deformed and produce relative movement with the first support layer 519, while the primary reverse osmosis membrane 5171 does not deform and ensures its own purification effect on water. The pressure pulsation will cause the pure water to drive the primary membrane layer 517 to expand and contract reciprocatingly when passing through the primary membrane layer 517. The primary reverse osmosis membrane 5171 does not deform while the elastic membrane 5172 deforms. At the same time, the first support layer 519 also produces appropriate deformation under the expansion and compression of the primary membrane layer 517, so that the first support layer 519 and the primary membrane layer 517 produce relative movement. The first support layer 519 scrapes and cleans the crystals attached to the outside of the primary membrane layer 517, and the crystals separated from the primary membrane layer 517 will be discharged in the reverse direction with the high-pressure pure water, thereby achieving the purpose of reverse flushing the crystals, improving the equipment utilization rate, extending the service life of the reverse osmosis equipment 500, and reducing the equipment maintenance cost.

The present invention adopts a two-stage reverse osmosis membrane design, which has the beneficial effect that, during the deformation process of the primary membrane layer, the primary reverse osmosis membrane that does not deform does not deform, but will be subjected to tensile force. After cleaning the crystals many times, permanent tensile deformation may occur, which will affect the permeability. Therefore, the designed secondary reverse osmosis membrane can ensure that even if the primary membrane layer 517 has a permeation problem, the water obtained by the inner tube is still pure water, thereby ensuring the quality of the pure water.

The voids of the primary reverse osmosis membrane are the same as those of the secondary reverse osmosis membrane, or the voids of the primary reverse osmosis membrane are slightly larger than those of the secondary reverse osmosis membrane. The voids of the secondary reverse osmosis membrane are the same as those of the existing pure water reverse osmosis membrane, and pure water for industrial use can be obtained through reverse osmosis.

Claims (8)

1. A reverse osmosis industrial water purifier with a changeable working mode comprises reverse osmosis equipment; the reverse osmosis equipment comprises a plurality of reverse osmosis components which are connected in parallel;

the reverse osmosis component comprises a barrel body, a plurality of reverse osmosis units connected in series are arranged in the barrel body, each reverse osmosis unit comprises an inner pipe, a first water inlet is formed in the pipe wall of the inner pipe, an outer pipe is sleeved outside the inner pipe, a second water inlet with the width larger than that of the first water inlet is formed in the position, corresponding to the first water inlet, of the pipe wall of the outer pipe, an reverse osmosis layer is arranged at the second water inlet, and a scroll of the reverse osmosis layer is wound on the outer pipe;

The reverse osmosis layer comprises two first-stage membrane layers and two second-stage reverse osmosis membranes, the two first-stage membrane layers are respectively adhered to two circumferential edges of the second water inlet, the two second-stage reverse osmosis membranes are respectively adhered to two circumferential edges of the first water inlet, the two second-stage reverse osmosis membranes are sealed at the two axial ends, an impermeable membrane for sealing the radial ends of the first-stage membrane layers and the second-stage reverse osmosis membranes is sealed at the outer side of the first-stage membrane layers, a first supporting layer is arranged between the impermeable membrane and the first-stage membrane layers, a second supporting layer is arranged between the second-stage reverse osmosis membranes and the first-stage membrane layers at the same side, and the two axial ends of the second supporting layer are sealed;

The inner pipe and the outer pipe of the reverse osmosis unit positioned at the water inlet end are sealed and covered by the end cover;

The first-stage membrane layer comprises a plurality of first-stage reverse osmosis membranes connected through elastic membranes; the first supporting layer is composed of elastic diamond cylinders connected side by side.

2. The variable mode of operation reverse osmosis industrial water purifier of claim 1 wherein the reverse osmosis layer is covered by an outer jacket which is in close contact with the inner wall of the cylinder.

3. The variable-working-mode reverse osmosis industrial water purifier according to claim 1, wherein the water inlet end of the cylinder is provided with a third water inlet, the water outlet end of the cylinder is provided with a waste water pipe and a secondary pure pipe, the end of the secondary pure pipe is closed and positioned at the center of the end face of the cylinder, the pipe wall of the secondary pure pipe is provided with a water outlet, the secondary pure pipe is connected with the outer pipe of the reverse osmosis unit positioned at the water outlet end, the secondary pure pipe is internally provided with a pure water pipe communicated with the cylinder, and the pure water pipe is connected with the inner pipe of the reverse osmosis unit positioned at the water outlet end.

4. A variable mode of operation reverse osmosis industrial water purifier according to claim 3, wherein the reverse osmosis industrial water purifier further comprises a raw water tank, a booster pump, a sand filter, a carbon filter, a softener, a precision filter, a high pressure pump and a pure water tank, wherein the sand filter, the carbon filter and the softener are identical in structure, and the reverse osmosis device is connected between the high pressure pump and the pure water tank.

5. The variable-working-mode reverse osmosis industrial water purifier according to claim 4, wherein the sand filter, the carbon filter and the softener are all provided with three layers of filtering structures for sequentially preprocessing raw water from top to bottom, each layer of filtering structure is connected with the first main pipe in parallel, three second switching valves for switching raw water between the first main pipe and each layer of filtering structure are arranged on the first main pipe, each layer of filtering structure comprises six filtering tanks connected in parallel, two ends of each filtering tank are connected with pipelines, and the pipelines connected with two ends of each filtering tank are all provided with the first switching valves.

6. The variable mode of operation reverse osmosis industrial water purifier of claim 5 wherein the canister is provided with a collar having a support attached thereto and coupled to the first support.

7. The variable mode of operation reverse osmosis industrial water purifier of claim 4 wherein the purified water tube is in communication with the purified water tank via a third manifold and the third water inlet is in communication with the high pressure pump;

the water outlet is communicated with the fourth main pipe, and the waste pipe is communicated with the fifth main pipe.

8. The variable mode of operation reverse osmosis industrial water purifier of claim 1 wherein the outer tube is supportably connected to the inner tube by a support plate.