A seawater desalination treatment equipment

Abstract

The invention relates to the technical field of seawater desalination, and in particular to a seawater desalination treatment device; the device can realize the desalination treatment of seawater without being equipped with a filter, effectively reduces the accumulation of debris on the outer wall of an ultrafiltration membrane structure, has a scientific and reasonable structural layout, and is more energy-saving and environmentally friendly; the device comprises a box body with an opening at the bottom, a sedimentation seat assembly fixedly installed at the bottom of the box body, a plurality of ultrafiltration membrane structures fixedly installed on the top wall of the box body, a first vacuum pump, a piston plate slidably installed in the box body up and down, a driving shaft fixedly installed on the piston plate, a stretching floating mechanism and a counterweight assembly connected to the bottom of the piston plate, a plurality of sealing scrapers which are matched with and arranged corresponding to the ultrafiltration membrane structure are provided on the piston plate, and the ultrafiltration membrane structure passes through the middle of the sealing scraper; a one-way valve component allowing seawater to enter the box body in one direction is installed on the upper part of the box body, the top of the driving shaft freely extends from the top of the box body, and the stretching floating mechanism comprises a floating component and a traction rope.

Description

Technical Field

[0001] The invention relates to the technical field of seawater desalination, and in particular to a seawater desalination treatment device. Background Art

[0002] As we all know, seawater desalination is the use of seawater desalination to produce fresh water. It is an open-source incremental technology for realizing water resource utilization. It can increase the total amount of fresh water and is not affected by time, space and climate. It can ensure a stable water supply for coastal residents' drinking water and industrial water. The process of obtaining fresh water from seawater is called seawater desalination. The seawater desalination methods used include seawater freezing, electrodialysis, distillation, reverse osmosis, and ammonium carbonate ion exchange. The application of reverse osmosis membrane method and distillation method is the mainstream in the market.

[0003] For example, Chinese invention patent application CN117417006A discloses a seawater desalination pretreatment process system and operation method under low temperature conditions, which includes a raw water tank for storing seawater, a filter for removing seawater impurities, and an ultrafiltration membrane structure for seawater desalination. The three are connected, and the seawater stored in the raw water tank passes through the filter and the ultrafiltration membrane structure in sequence. The ultrafiltration membrane structure includes an inorganic ceramic membrane. In addition, it also includes a backwash component, which is arranged behind the water flow direction and close to the ultrafiltration membrane structure, and is used for automatic cleaning of the ultrafiltration membrane structure. It has the effect of reducing the influence of temperature on the permeability of the ultrafiltration membrane structure of the desalination system and improving the production capacity of the seawater desalination system in winter.

[0004] However, when this device was implemented, the following defects were found: the seawater contains debris such as mud, seaweed, etc., and filtering through a filter undoubtedly increases the investment cost of seawater desalination treatment. If the ultrafiltration membrane structure is directly used to desalinate the seawater, the debris is easy to adhere to the outer wall of the ultrafiltration membrane structure, and frequent backwashing is required, and even the ultrafiltration membrane is blocked and scrapped; in order to ensure that the seawater passes through the ultrafiltration membrane structure smoothly, the ultrafiltration membrane structure needs to be evacuated by a vacuum pump, and this process consumes a lot of energy. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides a seawater desalination treatment device which can realize seawater desalination treatment without being equipped with a filter, effectively reduces the accumulation of debris on the outer wall of the ultrafiltration membrane structure, has a scientific and reasonable structural layout, and is more energy-saving and environmentally friendly.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a seawater desalination treatment equipment, comprising a box body with an opening at the bottom, a sedimentation seat assembly fixedly installed at the bottom of the box body, a plurality of ultrafiltration membrane structures fixedly installed on the top wall of the box body, a first vacuum pump, a piston plate slidably installed in the box body, a drive shaft fixedly installed on the piston plate, a stretching floating mechanism and a counterweight assembly connected to the bottom of the piston plate, the piston plate is provided with a plurality of sealing scrapers that fit with and are arranged corresponding to the ultrafiltration membrane structure, and the ultrafiltration membrane structure passes through the middle of the sealing scraper; a one-way valve that allows seawater to enter the box body in one direction is installed on the upper part of the box body valve component, the top of the driving shaft extends freely from the top of the box body, the stretching floating mechanism includes a floating component and a traction rope, one end of the traction rope is connected to the top of the driving shaft, and the other end of the traction rope is connected to the floating component, and the input end of the first vacuum pump is connected to the inside of each ultrafiltration membrane structure; further, the height of the piston plate moving up and down from the box body is less than or equal to the average wave height of the corresponding sea area; the floating component can be a floating component with good buoyancy such as an air cushion raft and a life buoy; a cross beam is provided at the bottom of the box body; a sealing rubber ring is provided at the outer wall of the piston plate, and the piston plate and the inner wall of the box body are sealed by the sealing rubber ring.

[0009] Preferably, the sealing scraper includes two flanges and a rubber sealing scraper fixedly installed between the two flanges, and the rubber sealing scraper is fixedly installed on the piston plate through the two flanges; further, the ultrafiltration membrane structure passes through the middle of the rubber sealing scraper, and the middle of the rubber sealing scraper is in close contact with the outer wall of the ultrafiltration membrane structure.

[0010] Preferably, the counterweight assembly includes a scraper frame slidably installed on the outer wall of the box body, a counterweight block installed on the scraper frame, and two guide and stretching assemblies symmetrically arranged on the box body, the guide and stretching assembly includes a first guide pulley fixedly installed on the bottom of the box body, two second guide pulleys fixedly installed on the upper and lower parts of the vertical wall of the box body, and a pull rope, one end of the pull rope is fixedly connected to the bottom of the piston plate, and the other end of the pull rope is fixedly connected to the scraper frame after passing around the first guide pulley and the two second guide pulleys; further, the counterweight block is fixedly connected to the scraper frame by bolts; the first guide pulley is fixedly installed on the cross beam.

[0011] Preferably, it also includes a second vacuum pump, the input end of which extends into the upper part of the box body; the one-way valve component includes a valve body, a valve stem slidably mounted on the valve body, a valve plug fixedly mounted on the valve stem and a spring sleeved on the valve plug, and the valve plug is elastically connected to the inner cavity of the valve body through the spring; a driving member for driving the valve stem to move up and down is installed on the valve body, and the driving member includes a driving cylinder fixedly mounted on the valve body, a C-shaped frame fixedly mounted on the top of the valve stem, a sliding rod and a connecting plate slidably mounted on the C-shaped frame, and the output end of the driving cylinder is integrally connected with the sliding rod through the connecting plate, and the upper and lower parts of the sliding rod are provided with limit plates; further, one end of the C-shaped frame is fixedly connected to the top of the valve stem, and the other end of the C-shaped frame is located between the two limit plates; the driving cylinder is preferably a servo electric cylinder with a sealing and waterproof effect.

[0012] Preferably, the sinker seat assembly includes a counterweight seat, a connecting rod fixedly mounted on the counterweight seat, and a universal joint, wherein the top of the connecting rod is fixedly connected to the middle of the bottom end of the box body through a universal joint; further, the universal joint is installed in the middle of the cross beam at the bottom of the box body.

[0013] Preferably, the connecting rod is a telescopic rod, and a limiting bolt is screwed onto the telescopic rod.

[0014] Preferably, it also includes two bellows, the first vacuum pump is connected to the interior of the ultrafiltration membrane structure through the bellows, and the second vacuum pump is connected to the upper part of the box body through the bellows.

[0015] Preferably, the bottom opening of the box body and the inlet and outlet of the one-way valve are both provided with filter screens.

[0016] Preferably, the ultrafiltration membrane structure includes a hard ceramic filter membrane located on the outside and a reverse osmosis membrane located on the inside.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a seawater desalination treatment device with the following beneficial effects: the seawater desalination treatment device is sunk in the coastal sea area, and the interior of the ultrafiltration membrane structure is vacuumed by a first vacuum pump. In a natural state, under the action of a counterweight assembly, a piston plate is located at the lower part of a casing, and a floating part floats freely at the sea level. When waves appear, the waves drive the floating part to move upward, and after being driven by a drive shaft, the piston plate moves upward along the inner wall of the casing and the outer wall of the ultrafiltration membrane structure. At this time, the one-way valve member is in a closed state. During the upward movement of the piston plate, the pressure in the enclosed space between the casing and the piston plate increases, and under the vacuum action of the first vacuum pump, the pressure difference between the interior and exterior of the ultrafiltration membrane structure increases, thereby promoting the smooth passage of seawater in the enclosed space. Ultrafiltration membrane structure, and as the piston plate moves upward, the sealing scraper moves upward synchronously along the outer wall of the ultrafiltration membrane structure. When the waves recede, the floating part falls with the waves, the self-gravity of the counterweight assembly is greater than the buoyancy of the floating part, the piston plate moves downward in the box, the pressure in the box is reduced, the one-way valve opens, and seawater enters the box through the one-way valve; this process is repeated to scrape off the debris attached to the outer wall of the ultrafiltration membrane structure and the inner wall of the box; and the energy of the rising and falling waves is fully utilized to intermittently pressurize the seawater in the box, thereby improving the desalination efficiency of seawater. The desalination of seawater can be achieved without the need for a filter, effectively reducing the accumulation of debris on the outer wall of the ultrafiltration membrane structure, and the structural layout is scientific and reasonable, more energy-saving and environmentally friendly; the investment cost of seawater desalination equipment is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0020] Figure 2 It is a bottom upward view plan structure schematic diagram of the present invention.

[0021] Figure 3 The present invention Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0022] Figure 4 The present invention Figure 3 Schematic diagram of the cross-sectional structure at BB in the middle.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the sealing scraper of the present invention.

[0024] Figure 6 The present invention Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0025] Figure 7 The present invention Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0026] Markings in the attached drawings: 1. Box body; 2. First vacuum pump; 3. Piston plate; 4. Drive shaft; 5. One-way valve member; 6. Floating member; 7. Towing rope; 8. Flange; 9. Rubber sealing scraper; 10. Scraper frame; 11. Counterweight; 12. First guide pulley; 13. Second guide pulley; 14. Pull rope; 15. Second vacuum pump; 16. Valve body; 17. Valve stem; 18. Valve plug; 19. Spring; 20. Drive cylinder; 21. C-frame; 22. Slide rod; 23. Connecting plate; 24. Limiting plate; 25. Counterweight seat; 26. Connecting rod; 27. Universal joint; 28. Bellows; 29. ​​Filter; 30. Hard ceramic filter membrane; 31. Reverse osmosis membrane. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the invention, the technical solutions in the embodiments of the invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the invention.

[0028] As described in the background technology, a seawater desalination pretreatment process system and operation method under low temperature conditions; seawater contains debris such as mud, seaweed, etc. Filtration through a filter undoubtedly increases the investment cost of seawater desalination treatment. If an ultrafiltration membrane structure is directly used to desalinate seawater, the debris is easy to adhere to the outer wall of the ultrafiltration membrane structure, and frequent backwashing treatment is required, which may even cause the ultrafiltration membrane to be blocked and scrapped; in order to ensure that seawater passes through the ultrafiltration membrane structure smoothly, the ultrafiltration membrane structure needs to be vacuumed by a vacuum pump, and this process consumes a lot of energy.

[0029] In order to solve this technical problem, the present invention provides a seawater desalination treatment device, which is applied to seawater desalination treatment.

[0030] Specifically, please refer to Figure 1-3The desalination treatment equipment specifically includes: a box body 1 with an opening at the bottom, a sedimentation seat assembly fixedly installed at the bottom of the box body 1, a plurality of ultrafiltration membrane structures fixedly installed on the top wall of the box body 1, a first vacuum pump 2, a piston plate 3 slidably installed in the box body 1, a drive shaft 4 fixedly installed on the piston plate 3, a stretching floating mechanism and a counterweight assembly connected to the bottom of the piston plate 3, a plurality of sealing scrapers that match and are arranged correspondingly with the ultrafiltration membrane structure are provided on the piston plate 3, and the ultrafiltration membrane structure passes through the middle of the sealing scraper; a one-way valve member 5 that allows seawater to enter the box body 1 in one direction is installed on the upper part of the box body 1, the top of the drive shaft 4 freely extends from the top of the box body 1, and the stretching floating mechanism includes a floating member 6 and a traction member. Rope 7, one end of the traction rope 7 is connected to the top of the driving shaft 4, and the other end of the traction rope 7 is connected to the floating member 6, and the input end of the first vacuum pump 2 is connected to the inside of each ultrafiltration membrane structure; further, the height at which the piston plate 3 moves up and down from the box body 1 is less than or equal to the average wave height of the corresponding sea area; the floating member 6 can adopt a floating member with good buoyancy such as an air cushion raft and a life buoy; a cross beam is provided at the bottom of the box body 1, and the cross beam can support the bottom opening of the box body 1 to prevent deformation at the opening; in this embodiment, the counterweight assembly can adopt a counterweight block 11, and the counterweight assembly is fixedly installed at the bottom of the piston plate 3; a sealing rubber ring is provided at the outer wall of the piston plate 3, and the piston plate 3 and the inner wall of the box body 1 are sealed by the sealing rubber ring.

[0031] The seawater desalination treatment equipment provided by the present invention can make full use of the energy of the rising and falling waves to intermittently pressurize the seawater in the box 1, thereby improving the desalination efficiency of seawater. It can realize the desalination treatment of seawater without being equipped with a filter, effectively reducing the accumulation of debris on the outer wall of the ultrafiltration membrane structure, and the structural layout is scientific and reasonable, more energy-saving and environmentally friendly; it effectively reduces the investment cost of the seawater desalination equipment.

[0032] In order to enable those skilled in the art to better understand the invention, the technical solutions in the embodiments of the invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments of the invention and the features and technical solutions in the embodiments may be combined with each other.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] Example 1

[0036] Please refer to Figure 1-3, a seawater desalination treatment equipment, which includes a box body 1 with an opening at the bottom, a sedimentation seat assembly fixedly installed at the bottom of the box body 1, a plurality of ultrafiltration membrane structures fixedly installed on the top wall of the box body 1, a first vacuum pump 2, a piston plate 3 slidably installed in the box body 1, a drive shaft 4 fixedly installed on the piston plate 3, a stretching floating mechanism and a counterweight assembly connected to the bottom of the piston plate 3, a plurality of sealing scrapers that fit and are arranged correspondingly with the ultrafiltration membrane structure are provided on the piston plate 3, and the ultrafiltration membrane structure passes through the middle of the sealing scraper; a one-way valve member 5 that allows seawater to enter the box body 1 in one direction is installed on the upper part of the box body 1, the top of the drive shaft 4 freely extends from the top of the box body 1, the stretching floating mechanism includes a floating member 6 and a traction rope 7, one end of the traction rope 7 is connected to the top of the drive shaft 4, and the other end of the traction rope 7 is connected to the floating member 6, and the input end of the first vacuum pump 2 is connected to the inside of each ultrafiltration membrane structure;

[0037] Please refer to Figure 5 The sealing scraper includes two flanges 8 and a rubber sealing scraper 9 fixedly mounted between the two flanges 8, and the rubber sealing scraper 9 is fixedly mounted on the piston plate 3 through the two flanges 8; further, the ultrafiltration membrane structure passes through the middle of the rubber sealing scraper 9, and the middle of the rubber sealing scraper 9 is in close contact with the outer wall of the ultrafiltration membrane structure;

[0038] The counterweight assembly includes a scraper frame 10 slidably installed on the outer wall of the box body 1, a counterweight block 11 installed on the scraper frame 10 and two guide and stretching assemblies symmetrically arranged on the box body 1, the guide and stretching assembly includes a first guide pulley 12 fixedly installed on the bottom of the box body 1, two second guide pulleys 13 fixedly installed on the upper and lower parts of the vertical wall of the box body 1 and a pull rope 14, one end of the pull rope 14 is fixedly connected to the bottom of the piston plate 3, and the other end of the pull rope 14 is fixedly connected to the scraper frame 10 after passing through the first guide pulley 12 and the two second guide pulleys 13; further, the counterweight block 11 is fixedly connected to the scraper frame 10 by bolts; the first guide pulley 12 is fixedly installed on the cross beam, and pressure wheels are rotatably installed at the first guide pulley 12 and the second guide pulley 13, and the pull rope 14 is restricted to the corresponding first guide pulley 12 or the second guide pulley 13 by the pressure wheel.

[0039] In the seawater desalination treatment equipment provided in this embodiment, the rubber sealing scraper 9 and the outer wall of the ultrafiltration membrane structure have a sealing effect, and can move up and down with the piston plate 3. The rubber sealing scraper 9 scrapes off the debris attached to the outer wall of the ultrafiltration membrane structure during the up and down movement;

[0040] In the initial state, the scraper 10 is located at the bottom of the outer wall of the box body 1. When the waves drive the floating member 6 to move upward, the traction rope 7 pulls the drive shaft 4 and the piston plate 3 at the bottom of the drive shaft 4 to move upward synchronously. Under the action of the first guide pulley 12 and the two second guide pulleys 13, the scraper 10 moves up along the outer wall of the box body 1 after being transmitted by the pull rope 14. When the waves recede, the scraper 10 resets itself to the bottom of the box body 1 under the action of the counterweight 11. The scraper 10 can scrape off algae and other debris attached to the outer wall of the box body 1 during the up and down movement, reducing the difficulty of subsequent maintenance and cleaning of the equipment; the counterweight 11 is placed outside the box body 1, which reduces the space occupancy rate of the counterweight 11 in the box body 1, while allowing the counterweight 11 to move up and down stably with the scraper 10.

[0041] Example 2

[0042] The seawater desalination equipment provided in Example 1 is further optimized, specifically, Figure 1 , Figure 6 , Figure 7 As shown, it also includes a second vacuum pump 15, the input end of the second vacuum pump 15 extends into the upper part of the box body 1; the one-way valve member 5 includes a valve body 16, a valve stem 17 slidably mounted on the valve body 16, a valve plug 18 fixedly mounted on the valve stem 17 and a spring 19 sleeved on the valve plug 18, and the valve plug 18 is elastically connected to the inner cavity of the valve body 16 through the spring 19; a driving member for driving the valve stem 17 to move up and down is installed on the valve body 16, and the driving member includes a valve body 16 fixedly mounted on the valve body 16 A driving cylinder 20, a C-shaped frame 21 fixedly mounted on the top of the valve stem 17, a sliding rod 22 and a connecting plate 23 slidably mounted on the C-shaped frame 21, the output end of the driving cylinder 20 is integrally connected with the sliding rod 22 through the connecting plate 23, and limit plates 24 are provided on the upper and lower parts of the sliding rod 22; further, one end of the C-shaped frame 21 is fixedly connected to the top of the valve stem 17, and the other end of the C-shaped frame 21 is located between the two limit plates 24; the driving cylinder 20 is preferably a servo electric cylinder with a sealing and waterproof effect.

[0043] In the seawater desalination treatment equipment provided by the present embodiment, when the piston plate 3 moves downward, the pressure in the enclosed space formed between the box body 1 and the piston plate 3 decreases and is less than the external seawater pressure, the valve plug 18 moves upward, and the seawater enters the upper part of the box body 1 through the valve body 16. During the upward movement of the piston plate 3, the pressure in the enclosed space increases. Under the action of the spring 19, the valve plug 18 blocks the valve body 16 to ensure that there is sufficient pressure in the enclosed space; during the upward movement of the piston plate 3, the dirt at the bottom of the box body 1 can be discharged, and the seawater concentration in the enclosed space formed between the piston plate 3 and the box body 1 is getting higher and higher, and the dirt is gradually accumulated. At this time, the drive cylinder 20 is started, and the drive cylinder 20 drives the connecting plate 23 and the sliding rod 22 to move upward until a group of limit plates 24 at the bottom contact with the C-shaped frame 21, thereby lifting the valve stem 17 to move upward, and the valve plug 18 is separated from the blockage of the valve body 16, so that the one-way valve member 5 is in a normally open state. When the piston plate 3 moves up to the top of the box body 1, the dirt in the enclosed space can be discharged. The water is completely squeezed out, and when the piston plate 3 moves to the bottom of the box body 1, the seawater in the enclosed space is replaced; when the ultrafiltration membrane structure needs to be backwashed, the floating member 6 is temporarily separated from the traction rope 7 (the contact area between the floating member 6 and the sea surface can also be changed), and under the action of the counterweight assembly, the piston plate 3 is located at the bottom of the box body 1, the first vacuum pump 2 stops running, and the second vacuum pump 15 is turned on, and the drive cylinder 20 moves again until a set of upper limit plates 24 contacts the C-shaped frame 21, and the valve stem 17 drives the valve plug 18 to move downward to block the valve body 16; under the action of the second vacuum pump 15, the pressure in the box body 1 is gradually reduced until the external pressure of the ultrafiltration membrane structure is less than its internal pressure, and the salt ions adsorbed at the ultrafiltration membrane structure together with the desalted water remaining in the ultrafiltration membrane structure are gradually sucked out, and the ultrafiltration membrane structure can be backwashed by the second vacuum pump 15; the backwashing treatment of the ultrafiltration membrane structure can be achieved without setting a complex backwashing pipeline.

[0044] Specifically, the sinker assembly includes a counterweight seat 25, a connecting rod 26 fixedly mounted on the counterweight seat 25, and a universal joint 27, the top of the connecting rod 26 is fixedly connected to the middle of the bottom end of the box body 1 through the universal joint 27; further, the universal joint 27 is installed in the middle of the cross beam at the bottom of the box body 1;

[0045] The connecting rod 26 is a telescopic rod, and a limit bolt is screwed on the telescopic rod;

[0046] It also includes two bellows 28 , through which the first vacuum pump 2 is connected to the interior of the ultrafiltration membrane structure, and through which the second vacuum pump 15 is connected to the upper part of the box body 1 .

[0047] Please refer to Figure 3The counterweight seat 25 can make the box body 1 completely sink to the seabed, and the universal joint 27 can allow the box body 1 to move synchronously with the movement of the floating member 6, so that the traction rope 7 and the central axis of the driving shaft 4 are basically coincident, so as to facilitate the buoyancy at the floating member 6 to be transmitted to the piston plate 3 through the driving shaft 4, thereby improving the efficiency of the tensile floating mechanism in transmitting the tension at the piston plate 3; the distance between the bottom of the box body 1 and the seabed can be adaptively adjusted by adjusting the elongation of the telescopic rod to ensure that the bottom of the box body 1 is away from the seabed silt, and the telescopic rod with adjusted length can be locked by the limit bolt; and the bellows 28 can prevent the pipes on the first vacuum pump 2 and the second vacuum pump 15 from interfering with the synchronous movement of the box body 1 following the floating member 6.

[0048] For details, please refer to Figure 2 The bottom opening of the box body 1 and the inlet and outlet of the one-way valve member 5 are both provided with a filter 29; the filter 29 can prevent large pieces of seaweed or fish from entering the box body 1, thereby ensuring that the box body 1 is in a clean state.

[0049] For details, please refer to Figure 4 ; The ultrafiltration membrane structure includes a hard ceramic filter membrane 30 located on the outside and a reverse osmosis membrane 31 located on the inside; the hard ceramic filter membrane 30 on the outside can serve as a guide for the piston plate 3 to move up and down while filtering the seawater; the reverse osmosis membrane 31 only allows water molecules to pass through, while salt ions are retained to achieve the purpose of desalination of seawater; the reverse osmosis membrane 31 is a prior art, and the structure and principle of the reverse osmosis membrane 31 are not further limited or elaborated here, and the reverse osmosis membrane 31 that can achieve seawater desalination can be applied to this solution.

[0050] The use process of the seawater desalination treatment equipment provided by the present invention is as follows: the equipment is sunk in the coastal sea area, the counterweight seat 25 contacts the seabed, and the length of the telescopic rod is adjusted to ensure that there is a sufficient distance between the bottom of the box body 1 and the seabed; in the natural state, the piston plate 3 is located at the lower part of the box body 1 under the action of the counterweight assembly, and the floating member 6 floats freely at the sea level. When waves appear, the waves drive the floating member 6 to move up, and after being driven by the drive shaft 4, the piston plate 3 moves up along the inner wall of the box body 1 and the outer wall of the ultrafiltration membrane structure. At this time, the one-way valve member 5 is in a closed state. During the upward movement of the piston plate 3, the pressure in the enclosed space between the box body 1 and the piston plate 3 increases, and under the vacuum action of the first vacuum pump 2, the pressure difference between the inside and outside of the ultrafiltration membrane structure increases, which promotes the smooth flow of seawater in the enclosed space. Through the ultrafiltration membrane structure, as the piston plate 3 moves upward, the sealing scraper moves upward synchronously along the outer wall of the ultrafiltration membrane structure. When the waves recede, the floating member 6 falls with the waves, the self-gravity of the counterweight assembly is greater than the buoyancy of the floating member 6, the piston plate 3 moves downward in the box body 1, the pressure in the box body 1 is reduced, the one-way valve member 5 is opened, and the seawater enters the box body 1 through the one-way valve member 5; this is repeated to scrape off the debris attached to the outer wall of the ultrafiltration membrane structure and the inner wall of the box body 1; and the energy of the rising and falling waves is fully utilized to intermittently pressurize the seawater in the box body 1, and the interior of the ultrafiltration membrane structure is vacuumed by the first vacuum pump 2. Under the action of the ultrafiltration membrane structure, the debris and salt ions in the seawater are intercepted and removed, and the desalted water discharged from the output end of the first vacuum pump 2 can be collected and utilized.

[0051] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, electrically connected, or able to communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

Claims

1. A seawater desalination treatment equipment, characterized in that: It comprises a box body (1) with an opening at the bottom, a sedimentation seat assembly fixedly mounted on the bottom of the box body (1), a plurality of ultrafiltration membrane structures fixedly mounted on the top wall of the box body (1), a first vacuum pump (2), a piston plate (3) slidably mounted in the box body (1), a drive shaft (4) fixedly mounted on the piston plate (3), a stretching floating mechanism and a counterweight assembly connected to the bottom of the piston plate (3), wherein the piston plate (3) is provided with a plurality of sealing scrapers which are matched with and arranged corresponding to the ultrafiltration membrane structures, and the ultrafiltration membrane structures pass through the middle of the sealing scrapers; A one-way valve member (5) is installed on the upper part of the box (1) to allow seawater to enter the box (1) in one direction, and the top of the drive shaft (4) freely extends from the top of the box (1); The stretching floating mechanism comprises a floating member (6) and a traction rope (7), one end of the traction rope (7) is connected to the top of the driving shaft (4), the other end of the traction rope (7) is connected to the floating member (6), and the input end of the first vacuum pump (2) is connected to the inside of each ultrafiltration membrane structure; The invention also comprises a second vacuum pump (15), the input end of which extends into the upper part of the box body (1); the one-way valve component (5) comprises a valve body (16), a valve stem (17) slidably mounted on the valve body (16), a valve plug (18) fixedly mounted on the valve stem (17), and a spring (19) sleeved on the valve plug (18); the valve plug (18) is elastically connected to the inner cavity of the valve body (16) via the spring (19); the valve body (16) is provided with a valve stem (17) which is slidably mounted on the valve body (16), a valve stem (17) which is slidably mounted on the valve stem (17), and a valve plug (18) which is sleeved on the valve plug (18); the valve plug (18) is elastically connected to the inner cavity of the valve body (16) via the spring (19); A driving member for driving the valve stem (17) to move up and down is provided, the driving member comprising a driving cylinder (20) fixedly mounted on the valve body (16), a C-shaped frame (21) fixedly mounted on the top of the valve stem (17), a sliding rod (22) and a connecting plate (23) slidably mounted on the C-shaped frame (21), the output end of the driving cylinder (20) being integrally connected to the sliding rod (22) via the connecting plate (23), and a limit plate (24) is provided on the upper and lower parts of the sliding rod (22); The ultrafiltration membrane structure comprises a hard ceramic filtration membrane (30) located outside and a reverse osmosis membrane (31) located inside.

2. The seawater desalination equipment according to claim 1, characterized in that: The sealing scraper comprises two flanges (8) and a rubber sealing scraper (9) fixedly mounted between the two flanges (8); the rubber sealing scraper (9) is fixedly mounted on the piston plate (3) via the two flanges (8).

3. The seawater desalination equipment according to claim 1 or 2, characterized in that: The counterweight assembly comprises a scraper frame (10) slidably mounted on the outer wall of the box body (1), a counterweight block (11) mounted on the scraper frame (10), and two guide stretching assemblies symmetrically arranged on the box body (1), the guide stretching assembly comprising a first guide pulley (12) fixedly mounted on the bottom of the box body (1), two second guide pulleys (13) fixedly mounted on the upper and lower parts of the vertical wall of the box body (1), and a pull rope (14), one end of the pull rope (14) is fixedly connected to the bottom of the piston plate (3), and the other end of the pull rope (14) is fixedly connected to the scraper frame (10) after passing through the first guide pulley (12) and the two second guide pulleys (13).

4. The seawater desalination equipment according to claim 1, characterized in that: The sinker seat assembly comprises a counterweight seat (25), a connecting rod (26) fixedly mounted on the counterweight seat (25), and a universal joint (27), wherein the top of the connecting rod (26) is fixedly connected to the middle of the bottom end of the box body (1) via the universal joint (27).

5. The seawater desalination equipment according to claim 4, characterized in that: The connecting rod (26) is a telescopic rod, and a limiting bolt is screwed onto the telescopic rod.

6. The seawater desalination equipment according to claim 5, characterized in that: It also comprises two bellows (28), wherein the first vacuum pump (2) is connected to the interior of the ultrafiltration membrane structure through the bellows (28), and the second vacuum pump (15) is connected to the upper inner part of the box body (1) through the bellows (28).

7. The seawater desalination equipment according to claim 1, characterized in that: The bottom opening of the box body (1) and the inlet and outlet of the one-way valve member (5) are both provided with filter screens (29).

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