Reciprocating pump for conveying seawater

Abstract

The utility model relates to the technical field of wave power generation equipment, and discloses a reciprocating pump for conveying seawater, which comprises a pump cavity with variable volume, and the pump cavity is formed by enclosing a diaphragm side wall capable of generating elastic deformation, a top plate positioned at the upper end of the diaphragm side wall and a bottom plate positioned at the lower end of the diaphragm side wall. A suction valve and an extrusion valve are arranged on the top plate; the top plate reciprocates relative to the bottom plate, so that the side wall of the diaphragm is elastically deformed, the volume of the pump cavity is changed, and the reciprocating pump sucks liquid through the suction valve or discharges the liquid through the extrusion valve. No piston or other structures are arranged in the pump cavity and occupy the volume of the pump cavity, the volume of the pump cavity of the reciprocating pump is increased, the water pumping amount in one cycle is remarkably increased, and the overall efficiency of the device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wave energy power generation equipment technical field more specifically relates to a reciprocating pump for seawater delivery. BACKGROUND

[0002] Ocean energy is the energy extracted from the ocean, including tidal, wave, temperature difference, salinity difference and ocean current and other forms. It is a renewable energy, with the advantages of small environmental impact, strong sustainability. The development and utilization of ocean energy provides a new way for the optimization of global energy structure and environmental protection.

[0003] Because the ocean covers most of the earth's surface, so the ocean energy has great development potential. It can be used as an alternative to traditional fossil energy, which helps to reduce greenhouse gas emissions and combat global climate change. The use of ocean energy promotes the development of related technologies, including ocean energy power generation technology, energy conversion equipment, etc.

[0004] Wave energy is generated by the rising and falling movement of sea waves. This energy uses the wave power generated by wind acting on the sea surface. Wave energy capture technology includes oscillating water column technology that captures wave energy with air as a carrier, oscillating buoy technology that captures wave energy with floating body movement, and overtopping technology that captures wave energy with seawater potential. The key technology for utilizing wave energy is to convert the captured wave energy, and in order to convert different forms of primary captured energy, different types of PTO (power take-off) must be used. Usually, wave energy needs to go through three levels of conversion: the first level is the wave body that absorbs the wave energy scattered on the sea surface; the second level is the intermediate conversion device; the third level is the actual use of energy.

[0005] Currently, wave energy is mainly used for power generation, and existing second-level conversion devices mainly include three energy transmission methods: pneumatic, hydraulic and mechanical. Among them, the hydraulic wave energy utilization device is getting more and more attention. This technology uses a floating body to capture wave energy, and converts the wave energy into hydraulic energy through a hydraulic device connected to the floating body, and then converts it into electrical energy through a generator.

[0006] The invention patent with publication number CN101424243A discloses a wave energy water pumping device. The device changes the volume of the pump chamber by the up-and-down reciprocating movement of the piston in the cylinder, to realize water pumping and drainage. However, it is very troublesome to realize the up-and-down sliding of the piston relative to the cylinder in the sea, and the piston type structure has insufficient pump cavity volume, limited single water pumping capacity, and the wear and seizure problems during sliding are difficult to solve, which will seriously affect and restrict the efficiency of the device. SUMMARY

[0007] To solve the problems and deficiencies in the prior art, the utility model provides a reciprocating pump for seawater delivery, the utility model discloses a reciprocating pump is formed by the diaphragm side wall of elastic deformation and the top plate and bottom plate of relative motion on the upper and lower ends of diaphragm side wall, and the diaphragm side wall and top plate and bottom plate form the pump cavity of variable volume. The utility model is based on the relative motion of top plate and bottom plate, makes the elastic deformation of diaphragm side wall, and changes the volume of pump cavity, thereby realizing the water absorption and drainage of reciprocating pump. The utility model discloses that the pump cavity does not have the structure such as piston to occupy the volume of pump cavity, therefore, increases the volume of pump cavity of reciprocating pump, and the water pumping amount in a cycle is increased significantly, improves the overall efficiency of device.

[0008] In order to realize the above-mentioned utility model purposes, the technical scheme of the utility model is as follows:

[0009] The utility model discloses a reciprocating pump for seawater delivery, the reciprocating pump includes the pump cavity of variable volume, the pump cavity is formed by the diaphragm side wall of elastic deformation and the top plate and bottom plate of relative motion on the upper and lower ends of diaphragm side wall, and is enclosed and is formed, is provided with suction valve and pressure valve on the top plate;The top plate reciprocating motion relative to bottom plate, makes the elastic deformation of diaphragm side wall, and changes the volume of pump cavity, so that the pump cavity absorbs liquid through suction valve, or discharges liquid through pressure valve.

[0010] As preferably, the diaphragm side wall is easy to have elastic deformation in the axial direction.

[0011] As preferably, the diaphragm side wall has telescopic laminated corrugated folds, and the top plate reciprocating motion relative to bottom plate, makes the laminated corrugated folds stretch and contract along the axial direction.

[0012] As preferably, the corrugated recess portion of the laminated corrugated folds is installed with a hoop.

[0013] As preferably, the trend of the corrugated recess portion and the corrugated convex portion of the laminated corrugated folds is parallel to the top plate or the bottom plate.

[0014] As preferably, the diaphragm side wall is made of elastic composite material.

[0015] As preferably, the reciprocating pump has a driving device for making the top plate and the bottom plate move relative to each other in the axial direction, and the driving device is connected with the top plate to drive the top plate to move relative to the bottom plate.

[0016] The utility model has the advantages of:

[0017] (1) The utility model discloses a reciprocating pump's pump cavity is enclosed by the diaphragm side wall that can produce elastic deformation and the top plate and bottom plate that can make relative motion and are located at the upper and lower ends of diaphragm side wall. The utility model discloses the pump cavity that is enclosed forms, and there is no piston structure such as occupying the pump cavity volume, therefore, increase the pump cavity volume of reciprocating pump, and the pump water volume in a cycle increases significantly, improves the overall efficiency of device.

[0018] (2) The utility model discloses the change of reciprocating pump pump cavity volume is realized through the relative motion of top plate and bottom plate, and the elastic deformation of diaphragm side wall is prompted, and the extension and contraction of diaphragm side wall along the axial direction correspond the increase and reduction of pump cavity volume. The reciprocating pump of the utility model does not have the up-down sliding of piston relative to cylinder, therefore, does not have the wear and jam problem, and greatly improves the service life and energy conversion efficiency of pump.

[0019] (3) The utility model discloses the reciprocating pump's layering type corrugation fold's fold recessed part and fold convex part's trend are parallel with top plate or bottom plate, therefore, can reduce the deformation that can appear in the radial direction of diaphragm side wall.

[0020] (4) The utility model discloses the fold recessed part of layering type corrugation fold designs the hoop, to prevent the deformation of diaphragm side wall from being too large and not being able to reset completely when bearing larger pressure, lead to the pumping benefit reduction, even unable normal tooling. BRIEF DESCRIPTION OF DRAWINGS

[0021] The foregoing and subsequent specific description of the utility model becomes more clear when reading in conjunction with the following drawings, and the drawings are:

[0022] Figure 1 It is the structure schematic diagram of the utility model reciprocating pump;

[0023] In the drawing:

[0024] 1, pump cavity;2, diaphragm side wall;3, top plate;4, suction valve;5, pressure valve;6, layering type corrugation fold;7, hoop;8, bottom plate;100, float. DETAILED DESCRIPTION

[0025] In order to make the technical personnel in the art better understand the technical scheme in the utility model, the following will be through several specific embodiments to further illustrate the technical scheme for realizing the purpose of the utility model, it is to be explained that the technical scheme that the utility model claims protection includes but is not limited to the following embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the technical personnel in the art without making creative labor, should belong to the scope of protection of the utility model.

[0026] An embodiment of this utility model provides a reciprocating pump for seawater transportation. The pump chamber of the reciprocating pump is formed by a diaphragm sidewall capable of elastic deformation and a top plate and a bottom plate located at the upper and lower ends of the diaphragm sidewall and capable of relative movement. The relative movement between the top plate and the bottom plate causes the diaphragm sidewall to undergo elastic deformation, thereby changing the volume of the pump chamber and realizing the water intake and drainage of the reciprocating pump.

[0027] The present invention will be explained and described in more detail below with reference to specific implementation methods.

[0028] Example 1

[0029] This embodiment discloses a reciprocating pump for seawater transportation, as shown in the attached instruction manual. Figure 1 As shown, the reciprocating pump includes a top plate 3 and a bottom plate 8 that can move relative to each other, and a tubular diaphragm sidewall 2 that connects the top plate 3 and the bottom plate 8 and is capable of elastic deformation. The top plate 3 and the bottom plate 8 seal the openings at the upper and lower ends of the diaphragm sidewall 2, and the three together form a pump chamber 1 with a variable volume. The top plate 3 or the bottom plate 8 is provided with a suction valve 4 that communicates with the pump chamber 1, and the top plate 3 or the bottom plate 8 is provided with a discharge valve 5 that communicates with the pump chamber 1. The relative movement between the top plate 3 and the bottom plate 8 causes the diaphragm sidewall 2 connected between the two plates to undergo elastic deformation, which in turn causes the volume of the pump chamber 1 to change, thereby drawing seawater into the pump chamber 1 through the suction pipe or discharging seawater out of the pump chamber 1 through the discharge pipe 12.

[0030] In the embodiments described in this utility model, it can be understood that the relative movement between the top plate 3 and the bottom plate 8 can be manifested in the following two ways: when the two move relative to each other and the distance between them gradually increases, the diaphragm sidewall 2 is deformed and elongated, and the volume of the pump chamber 1 increases. The suction valve opens, and seawater is pumped into the pump chamber 1 through the suction pipe. When the two move relative to each other and the distance between them gradually decreases, the two plates squeeze the diaphragm sidewall 2, the diaphragm sidewall 2 is deformed and compressed, and at the same time, the volume of the pump chamber 1 is compressed and reduced. The discharge valve opens, and seawater is pumped out of the pump chamber 1 through the drain pipe.

[0031] In the embodiments described in this utility model, it is understood that the valve generally refers to a valve, and a one-way valve is preferred.

[0032] In the embodiments described in this utility model, it is understood that the cross-sectional shape of the tubular diaphragm sidewall 2 can be circular, rectangular, or hexagonal, etc. This utility model does not limit its cross-sectional shape.

[0033] In the embodiments described in this utility model, it is understood that the diaphragm sidewall is made of elastic composite materials such as rubber and polyurethane. This utility model does not limit the material, as long as it can easily undergo elastic deformation. Considering the operating environment of the reciprocating pump, the diaphragm sidewall 2 is preferably made of a corrosion-resistant material.

[0034] Furthermore, to facilitate the installation of the valve, a suction pipe communicating with the pump chamber 1 is provided on the top plate 3 or the bottom plate 8, and a suction valve 4 is installed inside the suction pipe. A drain pipe communicating with the pump chamber 1 is provided on the top plate 3 or the bottom plate 8, and a discharge valve 5 is provided on the drain pipe.

[0035] It is understood that the suction pipe and the drain pipe can both be installed on the top plate 3 or both on the bottom plate 8; furthermore, the suction pipe can be installed on the top plate 3 and the drain pipe on the bottom plate 8, or the drain pipe can be installed on the top plate 3 and the suction pipe on the bottom plate 8. This utility model does not limit the specific installation position of the suction pipe and the drain pipe, as long as the pump chamber 1 can be used for water intake and drainage.

[0036] Example 2

[0037] This embodiment discloses a reciprocating pump for seawater transportation. Based on Embodiment 1, the reciprocating pump has a drive device that causes the top plate 3 and the bottom plate 8 to move relative to each other in the axial direction. The drive device is connected to the top plate 3 or the bottom plate 8, causing relative movement between the top plate 3 and the bottom plate 8.

[0038] Example 3

[0039] This utility model discloses a reciprocating pump for seawater transportation. Based on the above embodiment, the reciprocating pump is used to capture wave energy and achieve energy conversion. Specifically, the reciprocating pump is placed in the sea, and the top plate 3 moves up and down with the rise and fall of the sea waves. The bottom plate 8 is connected to a damping structure to provide resistance and limit the bottom plate 8's up and down movement with the waves. Under the action of the damping structure, the bottom plate 8 remains almost stationary. Based on the above structure, when the top plate 3 floats with the waves, the top plate 3 moves axially away from the bottom plate 8, and the top plate 3 and the bottom plate 8 undergo relative motion. This relative motion stretches the diaphragm sidewall 2 and simultaneously increases the volume of the pump chamber 1. The suction valve 4 opens, drawing seawater into the pump chamber 1 through the suction valve 4. Then, as the top plate 3 sinks with the waves, it moves axially toward the bottom plate 8. At this time, the relative movement of the top plate 3 and the bottom plate 8 compresses the diaphragm sidewall 2, and the two plates squeeze the pump chamber 1, which reduces the volume of the pump chamber 1. The discharge valve 5 opens, and the seawater in the pump chamber 1 is pumped out by the squeezing of the top plate 3 and the bottom plate 8.

[0040] Therefore, it can be understood that the driving device of the reciprocating pump at this time is actually the wave generated by the seawater. The wave has wave energy, which causes relative motion between the top plate 3 and the bottom plate 8.

[0041] In the embodiments described in this utility model, the reciprocating relative motion between the top plate 3 and the bottom plate 8 causes the volume of the pump chamber 1 to increase and decrease periodically, thereby continuously pumping seawater into the water storage device.

[0042] Normally, a float 9 is connected to the bottom of the base plate 8. The float 9 serves as a connector between the base plate 8 and the damping structure. Its end is connected to the base plate 8, and its tail is fixedly connected to the damping structure.

[0043] Furthermore, it is worth mentioning that the damping structure connected to the bottom plate 8 can be a damping disc or a fixed component located in the sea that is not prone to displacement or movement. Specifically, the tail of the float 9 is connected to the damping disc, which provides resistance to movement, thus preventing the bottom plate 8 from moving up and down with the waves. Under the action of the damping disc, the bottom plate 8 remains stationary and does not float up and down with the waves, while relative movement can occur between it and the top plate 3, enabling the pumping of liquid.

[0044] Furthermore, the tail of the float 9 is connected to a fixed component in the sea. The fixed component can be a base set on the seabed, a power generation platform set in the sea, or even a reef or sunken rock in the sea. The fixed component is not easy to move with the ups and downs of the waves, so it can provide motion resistance to prevent the bottom plate 8 from moving up and down with the ups and downs of the waves.

[0045] It should be noted that when the base plate 8 is connected to the damping disc via the float 9, to prevent the reciprocating pump from drifting to distant sea areas with the waves, the damping disc is usually equipped with flexible structures such as ropes and anchor chains, which are then connected to fixed components in the sea via these flexible structures. Similarly, the fixed components can be a base on the seabed, a power generation platform set in the sea, or a reef or sunken rock structure in the sea. The fixed components hold the reciprocating pump in place, preventing it from drifting to distant sea areas.

[0046] Example 4

[0047] This utility model discloses a reciprocating pump for seawater transportation. The reciprocating pump is typically used in conjunction with a float 100, which is a hollow, sealed housing. The reciprocating pump is placed within the internal cavity of the float 100. The top plate 3 of the reciprocating pump is fixedly connected to the float 100, and the bottom plate 8 is connected to a damping structure located outside the float 100. Specifically, the float 100 typically has an intake port and an outlet. One end of the intake pipe on the top plate 3 communicates with the pump chamber 1, and the other end passes through the intake port on the float 100 to communicate with the outside. Similarly, one end of the outlet pipe on the top plate 3 communicates with the pump chamber 1, and the other end passes through the outlet on the float 100 to communicate with the outside. The top plate 3 of the reciprocating pump is fixedly connected to the float 100 via the outlet pipe and the intake pipe, and there is no relative movement between the two.

[0048] After the float 100 is assembled, the float 100 equipped with the reciprocating pump is placed in the sea. The float 100 floats on the sea surface by buoyancy and moves up and down with the waves, thereby driving the top plate 3 connected to it to move synchronously. The external damping structure prevents the bottom plate 8 from moving together, and the bottom plate 8 remains stationary. The relative movement between the top plate 3 and the bottom plate 8 causes the diaphragm sidewall 2 to undergo elastic deformation, and at the same time causes the volume of the pump chamber 1 to change. Finally, seawater is sucked into the pump chamber 1 through the suction pipe or discharged from the pump chamber 1 through the drain pipe 12.

[0049] Understandably, when the float 100 is at the crest of a wave, it causes the top plate 3 to move away from the bottom plate 8, increasing the distance between the two plates. This causes the diaphragm sidewall 2 to elastically deform and lengthen, increasing the volume of the entire pump chamber 1. The suction valve 4 opens, and seawater is drawn into the pump chamber 1 through the suction pipe. Conversely, when the float 100 is at the trough of a wave, it causes the top plate 3 to move towards the bottom plate 8, decreasing the distance between the two plates. The diaphragm sidewall 2 gradually returns to its original shape, reducing the volume of the entire pump chamber 1. The suction valve 4 closes, and the discharge valve 5 opens, forcing the seawater out of the pump chamber 1 through the discharge pipe and into the subsequent water storage container. Thus, the reciprocating pump converts the captured wave energy into hydraulic energy, achieving energy capture. This energy can be further transferred to a generator system for power generation. The generated electricity can be used to power remotely operated underwater equipment, unmanned surface vessels, robots, and monitoring systems.

[0050] It should be noted that when the reciprocating pump is used in conjunction with the float 100, if the suction pipe 11 or the drain pipe 12 is installed on the base plate 8, the corresponding pipe needs to be slidably connected to the suction port or drain port of the float 100.

[0051] Furthermore, the end of the float 9 is connected to the bottom plate 8, and its tail directly penetrates the shell of the float 100 and is fixedly connected to the damping structure located outside the float 100. A bearing is provided between the float 9 and the float 100. As the float 100 rises and falls with the waves, the bearing can minimize the friction and resistance between the float 9 and the float 100. Similarly, a sealing structure such as a sealing rubber ring is also provided between the float 9 and the float 100 to ensure the sealing performance of the shell. However, regardless of the sealing method used, it should fall within the protection scope of this utility model.

[0052] Based on the above structure, it can be understood that the driving device of the reciprocating pump is the float 100. The float receives the energy transmitted by the waves and then drives the top plate 3 connected to it to move together, so that the top plate 3 and the bottom plate 8 will move relative to each other.

[0053] Example 5

[0054] This embodiment discloses a reciprocating pump for seawater transportation. Based on the above embodiment, the diaphragm sidewall 2 has stretchable, stacked corrugated pleats 6. When relative movement occurs between the top plate 3 and the bottom plate 8, the diaphragm sidewall 2 undergoes elastic deformation, and the stacked corrugated pleats 6 on the diaphragm sidewall 2 are stretched or compressed.

[0055] In the embodiments described in this utility model, it can be understood that when the top plate 3 moves away from the bottom plate 8, the distance between the two plates increases, the layered corrugated folds 6 on the diaphragm sidewall 2 are stretched open, the volume of the entire pump chamber 1 increases, and seawater is drawn into the pump chamber 1 through the suction valve 4; while when the top plate 3 moves towards the bottom plate 8, the distance between the two plates decreases, the diaphragm sidewall 2 gradually returns to its original state, the layered corrugated folds 6 are compressed, the volume of the entire pump chamber 1 decreases, and seawater is squeezed out of the pump chamber 1 through the discharge valve 5, completing the energy capture process.

[0056] Furthermore, after the layered corrugated folds 6 are unfolded, the direction of the folded recesses and folded protrusions is parallel to that of the top plate 3 or the bottom plate 8.

[0057] It should be noted that since the top plate 3 and bottom plate 8 of the reciprocating pump are parallel to each other, the direction of the folded recesses and folded protrusions of the stacked corrugated folds 6 is parallel to one of the top plate 3 or bottom plate 8, that is, parallel to both plates.

[0058] Example 6

[0059] This embodiment discloses a reciprocating pump for seawater transportation. Based on the above embodiment, the diaphragm sidewall 2 is prone to axial elastic deformation, which includes axial expansion and contraction deformation and stretching deformation.

[0060] Example 7

[0061] This embodiment discloses a reciprocating pump for seawater transportation. Based on the previous embodiment, to limit excessive deformation of the diaphragm sidewall 2 in the direction perpendicular to the axis, this embodiment installs a hoop 7 in the pleated recesses of the stacked corrugated pleats 6. The hoop 7 is fastened to the pleated recesses to prevent excessive deformation of the diaphragm under high pressure. The hoop 7, fastened to the pleated recesses, restricts the radial expansion or contraction of the object, preventing excessive radial deformation of the diaphragm sidewall 2 that would prevent it from fully returning to its original position, thus reducing the energy capture efficiency of the reciprocating pump or even causing it to malfunction.

[0062] Example 8

[0063] This embodiment discloses a method for preparing a reciprocating pump for seawater transportation. The preparation method is used to manufacture the reciprocating pumps described in any of the embodiments 1-7 above. The specific preparation method is as follows:

[0064] First, the tubular elastic composite material is processed by pressing and molding it into a structure with stretchable, layered corrugated folds 6. This structure is the diaphragm sidewall 2 of the reciprocating pump. Then, the top plate 3 and bottom plate 8 are respectively installed and connected to the upper and lower ends of the processed tubular diaphragm sidewall 2, and its opening is sealed. Finally, the top plate 3, bottom plate 8 and tubular diaphragm sidewall 2 are enclosed to form the pump chamber 1. A suction pipe and a drain pipe are installed on the top plate 3. The suction pipe has a suction valve 4 inside, and the drain pipe has a discharge valve 5 inside.

[0065] In the embodiments described in this utility model, it is understood that the tubular diaphragm sidewall can be sealed to the upper and lower cover plates by means of adhesive or bolt connection.

[0066] Example 9

[0067] This embodiment discloses a method for manufacturing a reciprocating pump for seawater transportation. The method is used to manufacture the reciprocating pumps described in any of the embodiments 1-7 above. The manufacturing method of this embodiment is slightly different from that of embodiment 9. The diaphragm sidewall 2 is formed by splicing together multiple hollow tubular structures. The specific manufacturing process is as follows:

[0068] A tubular structure is prepared using an elastic composite material. After processing, a hollow tubular structure with a large-diameter opening at one end and a small-diameter opening at the other end is formed. Multiple hollow tubular structures are processed and formed. Then, the hollow tubular structures are spliced ​​together along the axial direction to form a tubular diaphragm sidewall 2 with stretchable, layered corrugated folds 6. The upper and lower openings of the spliced ​​tubular diaphragm sidewall 2 are then connected to the top plate 2 and the bottom plate 8, respectively, to form a closed pump chamber 1. A suction pipe and a drain pipe are installed on the top plate 3. A suction valve 4 is provided in the suction pipe, and a discharge valve 5 is provided in the drain pipe.

[0069] It should be noted that during splicing, large-diameter openings are connected to form corrugated pleats, and small-diameter openings are connected to form corrugated pleats. After splicing, a tubular diaphragm sidewall 2 with expandable, stacked corrugated pleats 6 is finally formed.

[0070] In the embodiments described in this utility model, it is understood that large diameter and small diameter are relative concepts, referring to the fact that the openings at both ends of the processed hollow tubular structure are not the same size. The opening with the larger diameter is designated as the large diameter opening, and the other is designated as the small diameter opening. This utility model does not limit the opening diameter.

[0071] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0072] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0073] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A reciprocating pump for seawater transportation, characterized in that, The reciprocating pump includes a pump chamber (1) with variable volume. The pump chamber (1) is formed by a diaphragm sidewall (2) capable of elastic deformation, a top plate (3) located at the upper end of the diaphragm sidewall (2), and a bottom plate (8) located at the lower end. The top plate (3) is provided with an intake valve (4) and a discharge valve (5). The top plate (3) reciprocates relative to the bottom plate (8), causing the diaphragm sidewall (2) to undergo elastic deformation and changing the volume of the pump chamber (1), so that the pump chamber (1) can draw in liquid through the intake valve (4) or discharge liquid through the discharge valve (5).

2. A reciprocating pump for seawater transportation according to claim 1, characterized in that, The diaphragm sidewall (2) is prone to axial elastic deformation.

3. A reciprocating pump for seawater transportation according to claim 1, characterized in that, The diaphragm sidewall (2) has retractable, stacked corrugated pleats (6), and the top plate (3) moves up and down relative to the bottom plate (8), causing the stacked corrugated pleats (6) to extend and contract axially.

4. A reciprocating pump for seawater transportation according to claim 3, characterized in that, The folded recess of the layered corrugated folds (6) is fitted with a hoop ring (7).

5. A reciprocating pump for seawater transportation according to claim 3, characterized in that, The direction of the folded recesses and folded protrusions of the layered corrugated folds (6) is parallel to that of the top plate (3) or the bottom plate (8).

6. A reciprocating pump for seawater transportation according to claim 1, characterized in that, The diaphragm sidewall (2) is made of an elastic composite material.

7. A reciprocating pump for seawater transportation according to claim 1, characterized in that, The reciprocating pump has a drive device that causes the top plate (3) and the bottom plate (8) to move relative to each other in the axial direction, and the drive device is connected to the top plate (3).

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