Plunger pump used for sea water desalination and driven by wave energy

Abstract

The invention provides a plunger pump used for sea water desalination and driven by wave energy, and belongs to the technical field of power equipment, a plurality of air cylinders are uniformly arranged around a pump cylinder main body, and a piston is movably arranged in each air cylinder; the end parts of the pistons are jointly connected with a cylinder cover; a fixed shaft movably penetrates through the pump cylinder main body and is sleeved with an elastic piece, one end of the fixed shaft is connected with the cylinder cover, and the other end of the fixed shaft is connected with a tension piece; one end of the pump cylinder body is provided with a plurality of limiter supports, the cylinder cover is movably arranged on the limiter supports in a penetrating mode, and the ends of the limiter supports are jointly connected with a limiter. Spaces in the plurality of cylinders are communicated; and the bottom of one cylinder is communicated with a water inlet valve and a water outlet valve. The water pump can pump seawater and pressurize the seawater, utilizes a wave energy driving mode, does not need external electric power, is green and environment-friendly, is particularly suitable for places with abundant sea wave energy, and solves the problems of a traditional pressurizing water pump in the aspects of sea electric power supply, working cost, energy loss and the like.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment, and in particular to a plunger pump driven by wave energy for seawater desalination. Background Art

[0002] Common plunger pumps generally use a crankshaft connecting rod mechanism to convert the circular motion of the motor output into the linear reciprocating motion of the plunger to complete the pumping operation. When traditional booster pumps are used for seawater treatment, if they are driven by motors during offshore operations, they need to be equipped with power generation equipment or rely on shore power supply, which is difficult to achieve in areas far from the coast and lacking stable power infrastructure, and greatly increases costs and operational complexity. In the application scenario of seawater desalination, pumps are needed to pressurize seawater to meet the technical requirements of osmotic membranes. Traditional motor-driven plunger pumps have high energy consumption, which will inevitably put pressure on offshore seawater desalination work.

[0003] There is abundant wave energy at sea, and it is considered to use wave energy as driving energy. However, the existing wave energy utilization methods are mostly used for power generation. If wave energy is used to drive power generation and then provide electricity to drive water pumps, the energy form will be converted many times, resulting in large losses, which will inevitably affect the efficiency of wave energy utilization. Even if there are pumps driven by wave energy, there are many problems such as complex structural design, high manufacturing and maintenance costs.

[0004] At the same time, the common high-pressure water pump is a single-plunger pump, whose flow and pressure output will cause large pulsation, and its internal components will be subjected to greater pressure and wear, thus affecting the reliability and stability of the pump. Summary of the invention

[0005] The object of the present invention is to provide a plunger pump driven by wave energy for seawater desalination, so as to solve at least one technical problem existing in the above-mentioned background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a plunger pump driven by wave energy for seawater desalination, comprising: a plurality of cylinders are evenly arranged around a pump barrel body, a piston is movably arranged in each cylinder, the ends of all the pistons are commonly connected to a cylinder cover, a fixed shaft is movably passed through the pump barrel body, an elastic member is sleeved on the fixed shaft, one end of the fixed shaft is connected to the cylinder cover, and the other end of the fixed shaft is connected to a tension member, a plurality of limiter brackets are arranged at one end of the pump barrel body, the cylinder cover is movably passed through the limiter bracket, and the ends of the limiter bracket are commonly connected to a limiter, the spaces inside the plurality of cylinders are connected to ensure the circulation of seawater therein, and a water inlet valve and a water outlet valve are connected at the bottom of one of the cylinders.

[0008] Furthermore, the elastic member is a spring.

[0009] Furthermore, the number of the cylinders is 3.

[0010] Furthermore, a connecting ear plate is provided on the edge of the cylinder cover, a threaded through hole is provided on the connecting ear plate, and the top of the piston passes through the threaded through hole and is threadedly connected to the connecting ear plate.

[0011] Furthermore, a U-shaped connecting frame is pivotally connected to the bottom of the fixed shaft, and the U-shaped connecting frame is connected to the tension member.

[0012] Furthermore, the limiter is a limit plate, and the limit plate is provided with a plurality of threaded through holes corresponding to the limiter bracket, and the top of the limiter bracket passes through the threaded through holes and is threadedly connected to the limit plate.

[0013] The invention has the following beneficial effects: it can extract seawater and pressurize it. It is driven by wave energy, does not require external electricity, is green and environmentally friendly, and is particularly suitable for places with abundant wave energy at sea. It aims to solve the problems of traditional pressurized water pumps in terms of offshore power supply, working cost, energy loss, etc.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 This is a three-dimensional structural diagram of a wave-driven three-cylinder plunger pump according to an embodiment of the present invention.

[0017] Figure 2 This is a working diagram of a plunger pump driven by wave energy according to an embodiment of the present invention.

[0018] Figure 3 It is a schematic diagram of the partial structure of the three pistons and the spring shaft according to an embodiment of the present invention.

[0019] Figure 4 Schematic diagram of the piston movement of the plunger pump according to an embodiment of the present invention.

[0020] Figure 5 This is a connection structure diagram for connecting a plunger pump driven by wave energy to a ship hull according to an embodiment of the present invention.

[0021] Figure 6 This is a connection structure diagram for connecting a plunger pump driven by wave energy to a water tank according to an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the motion state of a plunger pump driven by wave energy according to an embodiment of the present invention when connected to a water tank for use.

[0023] Figure 8 This is a structural diagram of a device for applying a plunger pump driven by wave energy to seawater desalination according to an embodiment of the present invention.

[0024] Among them: 1-cable; 2-fixed shaft; 3-cylinder; 4-piston; 5-cylinder head; 6-limiter; 7-limiter bracket; 8-spring; 9-water inlet valve; 10-water outlet valve; 11-piston sealing ring; 12-hull connecting bracket; 13-cable protection connecting piece; 14-hull; 15-pump bracket; 16-water tank bracket; 17-water tank and pump connecting piece; 18-water tank; 19-water tank sliding connecting piece; 20-water tank limiter; 21-water inlet pipe; 22-seawater transmission pipe; 23-osmosis membrane device; 24-water outlet pipe; 25-connecting ear plate; 26-U-shaped connecting frame; 27-pump barrel body. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below by the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0026] It should be understood by those skilled in the art that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this invention belongs.

[0027] It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have a meaning consistent with that in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless as defined herein.

[0028] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or groups thereof.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0030] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the description of this specification, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present technology and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present technology.

[0032] Unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this technology can be understood according to specific circumstances.

[0033] To facilitate understanding of the present invention, the present invention is further explained below with reference to specific embodiments in conjunction with the accompanying drawings, and the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0034] Those skilled in the art should understand that the drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily required to implement the present invention.

[0035] The present invention provides a plunger pump driven by wave energy, which can extract seawater and pressurize it. The wave energy-driven method does not require external electricity, is green and environmentally friendly, and is particularly suitable for places with abundant wave energy at sea. It aims to solve the problems of traditional pressurized water pumps in offshore power supply, working costs, energy loss, etc. It can be specifically applied to seawater desalination, aiming to provide a low-energy, wave-powered working method support for seawater desalination technology.

[0036] Example 1

[0037] like Figure 1 , Figure 3 As shown, in this embodiment 1, a plunger pump driven by wave energy for seawater desalination is provided, including: a plurality of cylinders 3 are evenly arranged around a pump barrel body 27, and a piston 4 is movably provided in each cylinder 3; the ends of all pistons 4 are commonly connected to a cylinder cover 5; a fixed shaft 2 is movably passed through the pump barrel body 27, and an elastic member is sleeved on the fixed shaft 2; one end of the fixed shaft 2 is connected to the cylinder cover 5, and the other end of the fixed shaft 2 is connected to a tension member; a plurality of limiter brackets are provided at one end of the pump barrel body, and the cylinder cover is movably passed through the limiter bracket, and the ends of the limiter bracket are commonly connected to a limiter; the spaces inside the plurality of cylinders are connected to ensure the circulation of seawater therein; an inlet valve and an outlet valve are connected at the bottom of one of the cylinders.

[0038] In this embodiment, the elastic member is a spring 1, the number of the cylinders is 3, and the tension member is a pull rope. The edge of the cylinder head is provided with a connecting ear plate 25, and the connecting ear plate 25 is provided with a threaded through hole, and the top of the piston passes through the threaded through hole and is threadedly connected to the connecting ear plate. The bottom of the fixed shaft is pivotally connected with a U-shaped connecting frame 26, and the U-shaped connecting frame 26 is connected to the tension member. The limiter is a limit plate, and the limit plate is provided with a plurality of threaded through holes corresponding to the limiter bracket, and the top of the limiter bracket passes through the threaded through hole and is threadedly connected to the limit plate.

[0039] Specifically, the elastic member fixed shaft 2 passes through the central through hole of the spring 8 and the cylinder 3, is connected to the cylinder cover 5 at the top, and is connected to the tension member at the bottom. In this embodiment, the tension member is a cable 1. The cylinder 3 is fixed on the floating object, and there are three hollow cylinders inside it, and the central through hole passes through from top to bottom. The internal spaces of the three hollow cylinders inside the cylinder 3 are connected to ensure the circulation of seawater therein. The central through hole of the cylinder 3 is designed in size to prevent the spring 8 from slipping, and can compress the spring 8 together with the cylinder cover 5 above. There are three pistons 4, which are evenly distributed in a triangle around the elastic member fixed shaft 2 as the center, and are connected to piston sealing rings 11 at the bottom. The cylinder cover 5 connects the three pistons 4 and the elastic member fixed shaft 2 to achieve synchronization of the movement of the piston and the spring. The limiter 6 is connected to the cylinder 3 through the limiter bracket 7, and maintains a fixed distance from the cylinder 3 to limit the highest position of the piston movement and prevent the piston from excessive movement and causing damage to the equipment. The spring 8 is sleeved on the elastic member fixed shaft 2 and is located inside the cylinder 3. The cylinder 3 and the cylinder cover 5 work together to achieve compression. The water inlet valve 9 and the water outlet valve 10 are connected to the cylinder 3. The one-way valve is used to ensure that the seawater flows in a predetermined direction and prevents backflow. The water pipe can be connected externally.

[0040] like Figure 2 As shown, with the rise and fall of waves, the plunger pump driven by wave energy described in this embodiment cleverly converts wave energy into mechanical energy.

[0041] The cylinder is fixed on a floating object (such as a ship) to provide stable support for the entire system. The elastic member fixed shaft passes through the spring and the through hole in the center of the cylinder. A cable (such as an anchor rope) is connected below the elastic member fixed shaft. When the waves rise and fall, the tension of the cable and the elastic force of the spring interact to drive the piston to move. The three cylindrical cylinder columns of the cylinder are hollow inside to provide space for the accommodation and pressurization of seawater. The three cylinder columns inside the cylinder are connected to ensure that seawater flows between the three cylinder columns, so that the seawater can fully fill the cylinder. The three pistons and the elastic member fixed shaft are fixed and combined through the cylinder cover to ensure the synchronization of the piston movement. The limiter is connected to the cylinder through the limiter bracket, maintaining a fixed distance from the cylinder, limiting the highest position of the piston's upward movement, and preventing the piston from excessively moving and causing damage to the equipment. Seawater is pumped into the pump through the inlet valve, and the pressurized seawater is discharged through the outlet valve. Both the inlet valve and the outlet valve are one-way valves to ensure that the seawater flows in the predetermined direction and prevent backflow. External water pipes can be connected.

[0042] When in use, the cylinder is fixed on a floating object (such as a ship), and a cable is connected to the bottom of the fixed axis of the elastic part in the center. The cable is connected to a fixed object (such as an anchor) and falls into the sea to fix it. As the floating object fluctuates with the sea water, the pump will also fluctuate with the sea water. Under the action of the anchor's tension and the spring's elastic force, the three pistons and the elastic part's fixed axis move synchronously in the cylinder, continuously pumping and compressing the sea water. According to the cylinder structure design, it is ultimately possible to pressurize the sea water and discharge the pressurized sea water.

[0043] When the waves push the floating body upward, the cable generates a downward pulling force through the fixing effect of the anchor on the seabed. This pulling force overcomes the elastic force of the spring, causing the piston to move downward relative to the cylinder, thereby reducing the volume of the cavity in the pump, causing the air pressure in the pump to increase rapidly. Under the action of the pressure difference, the pressurized seawater will be discharged through the one-way valve of the outlet pipe. When the waves drive the floating object downward, the tension of the cable is reduced. At this time, the originally compressed spring is quickly reset, and its accumulated potential energy pushes the piston upward relative to the cylinder, causing the volume of the cavity in the pump to increase and the air pressure to decrease. As a result, under the action of the internal and external pressure difference, seawater is sucked into the pump through the one-way valve of the inlet pipe, fully filling the hollow part of the cylinder. Figure 2 As shown in the figure, the above process continues to cycle in the ups and downs of the waves, realizing the efficient conversion of wave energy into mechanical energy and stably driving the desalination process. According to different wave conditions, the appropriate pump stroke and plunger pump cross-sectional area are selected to ensure stable and efficient operation of the system.

[0044] The embodiment adopts a three-piston design. Figure 3 The figure shows the partial connection relationship of the three pistons. The elastic fixed shaft passes through the through hole in the center of the spring and the cylinder, and the cable is connected below. The size of the through hole in the center of the cylinder is designed to prevent the spring from slipping, and the spring can be compressed by the joint pressure of the cylinder cover above. The three pistons and the elastic fixed shaft are connected to the cylinder cover to ensure the synchronization of the movement of the three pistons and the spring. Piston sealing rings are equipped under the three pistons to effectively ensure the sealing of the pistons.

[0045] The three cylindrical cavities of the cylinder increase the water absorption capacity, so that more seawater can be processed per unit time, greatly improving work efficiency. The three pistons are evenly distributed in a triangular position. The elastic member in the center fixes the shaft to connect the spring and the cable. Under the coordinated action of the spring and the cable, the upper connecting piece ensures that the three pistons can respond synchronously, making the extraction and pressurization of seawater smoother and more continuous. In addition, compared with the traditional single-piston design, the three-piston design can share the workload more evenly, significantly reducing the wear and pressure on a single piston, thereby extending the service life of the entire plunger pump. In addition, the coordinated operation of the three pistons also effectively reduces the vibration and noise of the system, greatly improving the stability of the work.

[0046] In this embodiment, a stopper is specially provided, and the stopper is connected to the cylinder through a stopper bracket, and its function is to strictly limit the range of motion of the piston. During the movement of the piston, when the piston moves up and approaches the top of the cylinder, the stopper can stop the piston from continuing to move upward, and prevent the piston from excessively extending out of the cylinder, causing structural damage or abnormal operation.

[0047] Two one-way valves are used to ensure the unidirectionality of water flow, guaranteeing the smooth intake and transmission of seawater. Specifically, one one-way valve is installed as an inlet valve at the connection between the water inlet pipe and the water inlet of the cylinder. Its function is to ensure that seawater flows into the pump in one direction when the waves are falling and the pressure in the cylinder is low. The other one-way valve is installed as an outlet valve at the connection between the water outlet of the cylinder and the outlet pipe. When the waves rise and the pressure in the cylinder is high, it ensures that the water in the pump can only flow in one direction to the outlet pipe.

[0048] like Figure 4 The figure shows the movement of the piston of the plunger pump. Figure 4 (a) is a schematic diagram of the position of the piston when it moves to the bottom. Figure 4 (b) is a schematic diagram of the piston moving to the highest position limited by the top limiter. Driven by the waves, the floating object rises, the tension of the cable increases, the spring is compressed to the shortest, the piston seal is in close contact with the cylinder, the internal space of the cylinder is compressed to the minimum, and the pressurized seawater is discharged from the outlet valve. Conversely, the floating object descends, the tension of the cable decreases, and then the spring stretches, the internal space of the cylinder increases to form a negative pressure, and the seawater is pumped into the cylinder through the inlet valve. During the entire process of wave ups and downs, the piston continuously reciprocates up and down under the joint action of the spring and cable to achieve the extraction and pressurization of seawater.

[0049] In this embodiment, when the waves come, due to the fixing effect of the anchor, the pull rope and the floating hull move relative to each other and reach a force balance. Assume that the buoyancy is F f , then under the action of anchor fixation, its motion law can be described as: F f -m×g=m×a, where m is the mass of the ship, a is the acceleration, and m×g is the gravity.

[0050] After adding the plunger pump, it is also necessary to provide the working pressure F of compressed seawater w :F f -F w -m×g=m×a.

[0051] Assume the working pressure of the desalination membrane is P w , the cross-sectional area of ​​the plunger pump is S w , then the pressure F required for the plunger pump to work w For: F w =P w ×S w .

[0052] Introducing force increment ΔF w , the hull draft increases by Δh a Provides incremental buoyancy, which is equal to the working buoyancy F of the plunger pump. w Equal, used to calculate the increased draft of the hull. Suppose the effective area of ​​the hull is Sf , the density of seawater is ρ s , the acceleration due to gravity is g, and the increased draft is Δh a for:

[0053]

[0054] For a triplex plunger pump, its effective area S f is the sum of the areas of the three cylinders. Assuming the cross-sectional diameter of each cylinder is d, the effective area is: Then, the increased draft Δh a It can be calculated based on the diameter d of the cylinder:

[0055]

[0056] When each wave comes, the plunger pump compresses once. When working at full load, for the effective area S f , each cylinder has a cross-sectional diameter of d and a stroke of D. The amount of seawater compressed each time is V s :

[0057]

[0058] The pressure range of desalination membrane is usually between 150psi (1.03MPa) and 1200psi (8.27MPa), and its working pressure is generally about 150psi (1.03MPa) to 600psi (4.14MPa). The industry often uses kg (kg / cm 2 ) The rated pressure corresponds to a pressure of 70kg, and its pressure is 5.88MPa.

[0059] Note: 1Pa=1N / m 2 ,1kg / cm 2 =98.066501248092kPa (the value of gravity acceleration g is 9.8066501248092m / s 2 )

[0060] Example calculation:

[0061] Three-cylinder plunger pump, each cylinder has a diameter of 30mm and a stroke of 200mm. When each wave is fully loaded, the amount of seawater squeezed is V s for:

[0062]

[0063] Take the working pressure as 30kg (30kg / cm2≈2942kPa), the effective area of ​​the hull is 4m 2 , seawater density is 1.02kg / l (1020kg / m 3), the gravitational acceleration g is 9.8m / s 2 ,but:

[0064]

[0065] The waves need to have enough energy to cause the relative movement of the anchor cable and the hull, and the energy is reflected in the wave height. A rough estimate of the wave height can be calculated by calculating Δh a The sum of the piston stroke in the cylinder is obtained. If it is less than this value, it will not work properly, and even cannot drive the plunger pump. If it is greater than this value, it will work properly. The actual wave head does not rise parallel to the sea surface, so the wave height parameter should be calculated based on the average wave height to calculate the effective height.

[0066] According to the above formula, plus the stroke of 200mm, it is roughly estimated that full load operation can be achieved when the wave fluctuation is greater than 356mm. This height is generally easy to meet, so it shows that the plunger pump can work stably.

[0067] In addition, when the wave height is too large, it will not be possible to squeeze the seawater to complete the desalination work when reaching the end of the stroke. Therefore, when the invention is implemented, the cylinder capacity and cylinder stroke can be modified according to the actual situation. For example, in the case of large waves, a plunger pump with a large stroke can be replaced; for application scenarios with a large hull area, a plunger pump with a larger cross-sectional area can be used.

[0068] In summary, the plunger pump described in this embodiment has achieved an improvement on the traditional electric-driven seawater pressurization method. It does not require reliance on external power supply and is suitable for use in offshore environments far away from land, solving the problem of limited power supply. It improves energy utilization efficiency. The wave energy is directly converted into piston motion, which reduces the loss in the intermediate energy conversion link, so that the energy generated by the ups and downs of the waves can be more effectively converted into mechanical energy, thereby improving the efficiency of seawater pressurization and transportation. The structural design is optimized. Compared with complex electric pressurization equipment and systems that rely on external energy, the structure is relatively simple, with fewer components and is easy to manufacture and maintain. The three-piston design, precise flow control and reasonable limit setting enable the entire system to work relatively stably and continuously when facing complex and changeable wave conditions. It can be applied to seawater desalination, providing a method support for low-energy seawater desalination technology, which can effectively improve the efficiency and feasibility of seawater desalination, reduce the cost and energy consumption of seawater desalination, and provide new ideas for the development and utilization of offshore water resources.

[0069] Example 2

[0070] like Figure 5As shown, in this embodiment, the plunger pump driven by wave energy as described in Example 1 is installed with the hull as a floating object. One end of the hull connecting bracket 12 is firmly connected to the cylinder 3, and the other end is fixed to the hull 14 to ensure the stable installation of the plunger pump on the hull. The cable protection connector 13 is installed on the plane below the hull connecting bracket 12 and in contact with the cable 1, which plays a role in protecting the cable and reducing friction loss, and can be easily replaced after wear. The hull 14 is only shown in plan view here. It serves as a bearing platform for the entire device and provides a floating foundation for the plunger pump, so that the plunger pump can rise and fall with the waves on the sea surface with the hull.

[0071] like Figure 5 The connection and operation of the plunger pump and the hull have the following key points: the hull connection bracket has a 45° inclination, which makes the pump tilted and fixed. In the actual case of a ship anchoring, the cable at the lower end is not always vertically downward. Due to factors such as the flow of seawater, the cable may be pulled diagonally. The 45° inclination design can make the tension of the cable as close to the vertical direction as possible, thereby more effectively converting wave energy into the power of the plunger pump, improving energy utilization efficiency, reducing energy loss caused by deviation in the direction of tension, and ensuring stable and efficient operation of the plunger pump.

[0072] Description of the working process: The prerequisite for use is that the anchor connecting the hull to the plunger pump is dropped and fixed on the seabed. Then you can start working, and the working process is the same as the working process described in Example 1. The difference is that the hull connection bracket fixes the pump at a 45° inclination, and the cable is at a 45° inclination with the hull. The movement direction of the pump's piston is vertical to the bracket, and it moves at a 45° inclination with the hull, which does not affect its normal operation. During the whole process, the plunger pump can adapt to the ups and downs of the hull and continuously and stably extract and pressurize seawater.

[0073] Example 3

[0074] like Figure 6As shown, in this embodiment, the hull is used as a floating object, but no cable is used to apply tension. Instead, the tension is applied by the inertia of the connected water tank. The hull 14 is only shown in plane here. It serves as a bearing platform for the entire device and provides a floating foundation for the plunger pump, so that the plunger pump can rise and fall with the waves on the sea surface with the hull. One end of the pump bracket 15 is connected to the plunger pump, and the other end is fixed to the hull 14 to ensure the stable installation of the pump on the hull. The water tank bracket 16 is connected to the hull 14 to support the water tank 18. The water tank and pump connector 17 tightly connect the water tank 18 and the elastic member fixing shaft 2 of the pump. The pump connector 17 serves as a tension member of the pump, providing a driving force for the operation of the pump and ensuring power transmission. The water tank is connected to the water tank bracket 16 through the water tank sliding connector 19, and can slide up and down the water tank bracket 16. The water tank limiter 20 is installed at the upper end of the water tank bracket 16 to limit the maximum movement range of the water tank and prevent damage caused by excessive movement.

[0075] The water inlet valve 9 can be connected to a water inlet pipe, the other end of which leads to the sea for extracting seawater. The water outlet valve 10 is connected to a water outlet pipe, the other end of which is connected to a water tank 18 for storing the extracted seawater for subsequent use.

[0076] While considering the installation position of the water storage device, when applying pressure in this embodiment, unlike the plunger pump described in Example 1, the cable 1 is no longer used as the power of the spring shaft, but the delayed power is provided by the inertial motion of the water tank. Unlike the above-mentioned Example 2, the water tank bracket is installed vertically.

[0077] like Figure 7 As shown, Figure 7 (a) is a schematic diagram of the position when the movement reaches the end. Figure 7 (b) is a schematic diagram of the movement to the highest position under the restriction of the top limiter. This figure illustrates the movement of the embodiment of the connected water tank.

[0078] Regarding the use scenario of this embodiment, the cable 1 is no longer used as the tension of the spring shaft, so there is no need to stop the ship and drop anchor, and it can be used under normal driving. When the hull rises and falls with the waves on the sea, due to the effect of inertia, the water tank will produce reverse movement relative to the hull. When the hull 14 rises, the water tank 18 is still moving downward due to inertia, and the elastic member fixed shaft 2 is driven downward by the water tank and pump connector 17, compressing the spring 8, and then pushing the piston downward to achieve the pressurization action of the plunger. When the hull 14 descends, the water tank 18 will still move upward due to inertia, and the elastic member fixed shaft 2 is driven upward by the water tank and pump connector 17, the pressure on the spring 8 is reduced, and it automatically resets, and then pushes the piston upward to achieve the extraction action of the plunger. In this process, the water tank sliding connector 19 ensures that the water tank 18 moves up and down smoothly along the bracket, and the water tank limiter 20 prevents the water tank from moving excessively. The entire system repeats such actions continuously, thereby continuously and stably achieving the extraction and pressurization of seawater.

[0079] Example 4

[0080] Reverse osmosis is one of the important methods for desalination of seawater. When the reverse osmosis method is used to desalinate seawater, a pressure higher than the osmotic pressure needs to be applied on one side of the seawater to force the water molecules in the seawater to pass through the reverse osmosis membrane, while retaining the salt and other impurities on the other side, thereby achieving the desalination of seawater. If the seawater pressure is insufficient, it is difficult for water molecules to effectively pass through the reverse osmosis membrane, and the desalination effect will be greatly reduced. Using a plunger pump driven by wave energy to pressurize seawater can make full use of the natural energy in the ocean, avoid dependence on external energy supply, reduce the operating cost of the system and the impact on the environment, and also enhance the applicability of the system in environments with limited energy supply such as far away from land. Therefore, in this embodiment, the pump mentioned in the above-mentioned embodiment 1 is used to provide power for the process of desalination of seawater by reverse osmosis, realizing a seawater desalination system driven by wave energy.

[0081] like Figure 8 As shown, in the seawater desalination system based on wave energy, the seawater inlet pipe 21 is connected to the cylinder through the one-way valve of the inlet valve 9, one end of the seawater transmission pipe 22 is connected to the cylinder through the one-way valve of the outlet valve 10, and the other end is connected to the osmotic membrane device 23, ensuring that the seawater flows in a predetermined direction to prevent backflow. It is allowed to change the position of the inlet valve and the outlet valve during implementation, such as Figure 8 The positions of the water inlet and outlet valves are swapped to facilitate installation and use.

[0082] During operation, seawater is pumped into the plunger pump through the seawater inlet pipe 21 for pressurization, and the pressurized seawater is discharged through the seawater transmission pipe 22 and transmitted to the osmotic membrane device 23 to achieve seawater desalination. The fresh water outlet pipe 24 is connected to the osmotic membrane device 23 and is responsible for discharging the desalinated water to a designated location or container.

[0083] The desalination system is mainly composed of a seawater transport module, a seawater pressurization module that uses wave energy, a seawater desalination module and its sealing, connecting and fixing components. The main components and functions of each part are described below.

[0084] The seawater transport module mainly includes a seawater inlet pipe, a seawater transmission pipe, a freshwater outlet pipe and a connected one-way valve. The seawater inlet pipe is used to introduce the seawater to be treated into the seawater pressurization module; the seawater transmission pipe is responsible for transporting the pressurized seawater to the seawater treatment module; the outlet pipe is used to discharge the fresh water after desalination. The one-way valve ensures that the seawater flows in one direction during the transportation process.

[0085] The seawater pressurization module using wave energy uses a plunger pump driven by seawater wave energy as mentioned in Example 1 to pressurize the seawater, and then transports the pressurized seawater to the osmotic membrane device to achieve seawater desalination. This module converts the ups and downs of the waves into a pressurizing force for the seawater, thereby providing the required pressure conditions for the seawater to enter the membrane shell for desalination.

[0086] The seawater desalination module, which consists of an osmotic membrane device, is used to perform reverse osmosis desalination treatment on pressurized seawater to separate salt and other minerals, thereby obtaining usable fresh water. The reverse osmosis membrane inside the membrane shell has the characteristic of selective permeability. Under pressure, it allows water molecules to pass through while blocking salt and other minerals, thereby achieving seawater desalination.

[0087] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative work on the basis of the technical solution disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A plunger pump driven by wave energy for seawater desalination, characterized in that: include: A plurality of cylinders are evenly arranged around the pump barrel body, and a piston is movably arranged in each cylinder; the ends of all the pistons are commonly connected to the cylinder cover; a fixed shaft is movably passed through the pump barrel body, and an elastic member is sleeved on the fixed shaft; one end of the fixed shaft is connected to the cylinder cover, and the other end of the fixed shaft is connected to a tension member for providing driving force for the operation of the pump; a plurality of limiter brackets are arranged at one end of the pump barrel body, and the cylinder cover is movably passed through the limiter bracket, and the ends of the limiter bracket are commonly connected to a limiter; the spaces inside the plurality of cylinders are connected to ensure the circulation of seawater therein; an inlet valve and an outlet valve are connected at the bottom of one of the cylinders.

2. The plunger pump driven by wave energy for seawater desalination according to claim 1, characterized in that: The elastic member is a spring.

3. The plunger pump driven by wave energy for seawater desalination according to claim 1, characterized in that: The number of the cylinders is 3.

4. The plunger pump driven by wave energy for seawater desalination according to claim 1, characterized in that: A connecting ear plate is provided on the edge of the cylinder cover, a threaded through hole is provided on the connecting ear plate, and the top of the piston passes through the threaded through hole to be threadedly connected to the connecting ear plate.

5. The plunger pump driven by wave energy for seawater desalination according to claim 1, characterized in that: A U-shaped connecting frame is pivotally connected to the bottom of the fixed shaft, and the U-shaped connecting frame is connected to the tension member.

6. The plunger pump driven by wave energy for seawater desalination according to claim 1, characterized in that: The limiter is a limit plate, and a plurality of threaded through holes corresponding to the limiter bracket are arranged on the limit plate. The top of the limiter bracket passes through the threaded through holes and is threadedly connected to the limit plate.

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