CN219088062U

CN219088062U - Sea weed cultivation water changing device

Info

Publication number: CN219088062U
Application number: CN202321001172.1U
Authority: CN
Inventors: 史云峰; 史志强; 赵牧秋; 罗慧珏; 韩秋影
Original assignee: Yazhouwan Innovation Research Institute Of Hainan Institute Of Tropical Oceanography; Hainan Tropical Ocean University
Current assignee: Yazhouwan Innovation Research Institute Of Hainan Institute Of Tropical Oceanography; Hainan Tropical Ocean University
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-05-30
Anticipated expiration: 2033-04-28

Abstract

The utility model discloses a seaweed cultivation water changing device which comprises an incubator (1) with a sediment layer (2) inside, a water inlet and outlet funnel inserted into the sediment layer (2), and a water pipe with a first end communicated with a lower port of the water inlet and outlet funnel, wherein the section of an upper port of the water inlet and outlet funnel is larger than that of the lower port, a cover plate (4) capable of communicating or cutting off an opening of the upper port is arranged at the upper port, the distance between the cover plate (4) and the upper port is adjustable, a second end of the water pipe penetrates out of the incubator (1) to form a water inlet and outlet (11), the water inlet and outlet (11) is connected with a water pump during water injection, and the upper port of the water inlet and outlet funnel is higher than the upper surface of the sediment layer (2). No disturbance is caused to sediment when the sea water is replaced during the indoor cultivation of the seaweed; the height of the water inlet and the water outlet can be changed according to different thicknesses of sediments required by experiments; drainage and water injection are integrated, so that the water changing process is simpler, more convenient and more efficient.

Description

Sea weed cultivation water changing device

Technical Field

The utility model relates to the technical field of seaweed cultivation equipment, in particular to a seaweed cultivation water changing device.

Background

Seaweed is a type of higher plant that can survive in the ocean while sinking and complete the whole life history process of flowering, fruiting, germination, etc. in the ocean. The marine ecosystem formed by continuous distribution of seaweeds is called a seaweed bed, can stabilize a substrate, improve water quality, fix carbon and store carbon, provide important primary productivity and food network support for secondary consumers, provide habitat for economic aquatic animals and ensure healthy development of coastal travel industry, and plays an important role in maintaining health of offshore marine ecosystems and protecting coastal fishery resources, thus being called as a three-large typical marine ecosystem together with mangrove and coral reefs.

Almost all seaweed beds worldwide are under attenuation due to global changes and human activity. For example, research has shown that seaweed resources in the world are dying at a rate of 7% per year. In order to recover the sea weed resources which are sufficient and precious, researchers at home and abroad have conducted a great deal of research on the ecological system of sea weed beds, but because most of the existing indoor culture devices are modified and used by seaweed and fish culture devices, the conventional seaweed culture devices are provided with hard substrates such as rocks, and the fish culture devices are not provided with sediment and are not fully suitable for sea weed culture requiring sediment, a certain resistance is generated for the research of sea weed.

The biggest difference with fish and algae culture is that seaweed needs to be relatively stable and has sediment (matrix) with certain thickness, and researches show that seaweed can absorb nutrient elements required by growth of the seaweed through roots and leaves, wherein the leaves can be used for plant growth and development through absorbing nutrient substances in seawater, and a root system (root-shaped stems and fine heels) is the nutrient substances absorbed from sediment interstitial water. The sea grass growing in the intertidal zone under natural conditions has stable sediment environment and sufficient sea water nutrient components, but when the sea grass is cultivated in a laboratory, the sea water of the incubator needs to be replaced periodically because the sea water and the sediment have lower nutrient component content and limited sea water volume, which often causes insufficient nutrient supply and can not meet the long-term cultivation requirement of the sea grass.

The existing seaweed cultivation device can disturb sediment when replacing seawater (injecting and discharging), and the seawater is not completely replaced. Sediment disturbance caused by replacing sea water not only can destroy the habitat environment of the root of the sea weed, but also can reduce the transparency of the sea water, and affects the photosynthesis of the sea weed.

In view of the above, it is an urgent need of those skilled in the art to effectively invent a seaweed cultivation device capable of replacing sea water during cultivation without causing any disturbance to sediment.

Disclosure of Invention

The utility model aims to provide a sea weed cultivation water changing device, which can not cause any disturbance to sediment in the process of changing sea water during sea weed cultivation, can change the height of a water inlet and a water outlet along with the thickness of the sediment according to experimental requirements, drain old sea water and pour new sea water.

In order to solve the technical problems, the utility model provides the following technical scheme:

the utility model provides a sea weed is bred and trades water installation, includes that inside has the incubator of deposit layer, inserts business turn over water funnel, first end of deposit layer with the water-passing pipe of business turn over water funnel's lower port intercommunication, the last port cross-section of business turn over water funnel is greater than lower port cross-section, it is provided with the apron that can communicate or cut its open-ended to go up port department, the apron for the distance of last port is adjustable, the second end of water-passing pipe wears out the incubator forms the water inlet and outlet, and the water inlet and outlet are connected with the water pump during the water injection, the last port of business turn over water funnel is higher than the upper surface of deposit layer.

Optionally, the upper port of the water inlet and outlet funnel is 1-3cm higher than the upper surface of the sediment layer.

Optionally, the business turn over water funnel is hemisphere type funnel, hemisphere type funnel's periphery is provided with the nut, the axis direction of nut with hemisphere type funnel's axis direction is the same, be provided with on the apron with nut matched with screw rod, the screw rod connect in the nut, the screw rod screw in the degree of depth adjustable of nut.

Optionally, a knob is arranged at the upper end of the screw.

Optionally, the water pipe includes the telescopic hose that is linked together with the lower port of business turn over water funnel, with the fixed stereoplasm water pipe of telescopic hose lower extreme intercommunication, the outer end of fixed stereoplasm water pipe wears out the incubator.

Optionally, the axis of the telescopic hose is along the vertical direction, and the axis of the fixed hard water pipe is transversely arranged;

the axis of the fixed hard water pipe gradually goes down from the inner end communicated with the telescopic hose to the outer end.

Optionally, the incubator further comprises a fixing ring, wherein an annular groove of the fixing ring is sleeved on the telescopic hose, and a connecting rod of the fixing ring is connected with the incubator.

Optionally, a control valve is arranged at the outer end of the fixed hard water pipe.

Optionally, the water pipe is provided with a filtering membrane in the pipe at the second end during water injection, and the filtering membrane is detachably connected with the water pipe.

Optionally, the inner wall ring that leads to the water pipe is close to the second end is provided with two at least draw-in grooves, filtering membrane's outer wall be provided with draw-in groove matched with fixture block, the fixture block card is gone into rotate behind the draw-in groove filtering membrane.

The seaweed cultivation water changing device comprises an incubator, a water inlet and outlet funnel and a water pipe, wherein a cavity is formed in the incubator, and the incubator is a glass and plastic box body and is used for cultivating seaweed. The inside of the incubator is provided with a sediment layer with a set height, the water inlet and outlet funnel is inserted into the sediment layer, and the sediment layer has a fixing effect on the water inlet and outlet funnel. The upper port is provided with a cover plate, the distance between the cover plate and the upper port is adjustable, and the cover of the upper port of the water inlet and outlet funnel is realized, so that the upper port is communicated with or cut off from the incubator. The lower port of the water inlet and outlet funnel is communicated with the first end of the water pipe, and the second end of the water pipe penetrates out of the incubator.

When water is injected, the water inlet and outlet are connected with the water pump, the cover plate is separated from the upper port of the water inlet and outlet funnel, the filter membrane is arranged, so that the seawater flows from the water inlet and outlet to the upper port of the water inlet and outlet funnel after being filtered by the filter membrane, and the seawater overflows from the upper port of the water inlet and outlet funnel to be discharged, thus completing the seawater injection.

When the seawater is discharged, the water pump is disassembled, and the cover plate is separated from the upper port of the water inlet and outlet funnel, so that the seawater in the incubator is discharged.

The upper port of the water inlet and outlet funnel is always slightly higher than the upper surface of the sediment layer, the section of the upper port of the water inlet and outlet funnel is larger than that of the lower port, the water inlet and outlet funnel has a buffer effect on the seawater flowing through the water inlet and outlet funnel, the seawater slowly overflows from the upper port of the water inlet and outlet funnel, and no disturbance is caused to sediment. The water flow is controlled by adjusting the gap between the cover plate and the upper port. Specifically, in the beginning stage of injecting and discharging seawater, gaps between the cover plate and the upper port are smaller, the cover plate and the upper port of the water inlet and outlet funnel are separated to the maximum interval after the gaps are stable, and the seawater is immediately discharged from the interval, so that the water flow is controlled, and the impact disturbance of the water flow on sediment is relieved.

By applying the technical scheme provided by the embodiment of the utility model, when in use, the water discharge and water injection in the process of replacing the seawater are integrated, so that the seawater can be purified and injected, the water replacement process in culture is simpler, more convenient and more efficient, the clean state of the water in the tank can be always kept, and the seaweed cultivation effect is improved; in the process of replacing the seawater, the sediment is not required to be poured or moved, the sediment is not dispersed by the seawater, namely, the sediment is not disturbed, and the seawater replacement process is simplified.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a sea weed culture water changing device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the use of the sea weed culture water changing device.

The figures are marked as follows:

1-an incubator; 2-a deposit layer; 3-a knob; 4-cover plate; 5-hemispherical funnels; 6-a telescoping hose; 7-fixing rings; 8-fixed hard water pipes; 9-a control valve; 10-a filtration membrane; 11-water inlet and outlet; 12-sea water layer; 13-seaweed; black arrows indicate the direction of the discharged seawater; the white arrows indicate the direction of incoming seawater.

Detailed Description

The core of the utility model is to provide a sea grass cultivation water changing device, which can not cause any disturbance to sediment in the sea water changing process during sea grass cultivation, can change the height of a water inlet and a water outlet along with the thickness of the sediment according to experimental requirements, drain old sea water and pour new sea water.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 2, fig. 1 is a schematic structural diagram of a sea weed culturing water changing device according to an embodiment of the present utility model; FIG. 2 is a schematic diagram of the use of the sea weed culture water changing device.

In a specific embodiment, the seaweed cultivation water changing device provided by the utility model comprises an incubator 1 with a sediment layer 2 inside, a water inlet and outlet funnel inserted into the sediment layer 2, and a water pipe with a first end communicated with a lower port of the water inlet and outlet funnel, wherein the section of an upper port of the water inlet and outlet funnel is larger than that of the lower port, a cover plate 4 capable of communicating or cutting off an opening of the water inlet and outlet funnel is arranged at the upper port, the distance between the cover plate 4 and the upper port is adjustable, a second end of the water pipe penetrates out of the incubator 1 to form a water inlet and outlet 11, the water inlet and outlet 11 is connected with a water pump during water injection, and the upper port of the water inlet and outlet funnel is higher than the upper surface of the sediment layer 2.

In the structure, the seaweed cultivation water changing device comprises an incubator 1, a water inlet and outlet funnel and a water pipe, wherein a cavity is formed in the incubator 1, and the incubator 1 is a glass and plastic box body and is used for cultivating seaweed 13. Alternatively, the incubator 1 may be rectangular, or may have other shapes such as a cylinder. The height of the incubator 1 is generally 30-100cm depending on the kind of the cultured seaweed 13.

The inside of the incubator 1 is provided with a sediment layer 2 with a set height, the water inlet and outlet funnel is inserted into the sediment layer 2, and the sediment layer 2 has a fixing effect on the water inlet and outlet funnel. The upper port of the water inlet and outlet funnel is lower than the seawater layer 12, a cover plate 4 is arranged at the upper port of the water inlet and outlet funnel, the distance between the cover plate 4 and the upper port is adjustable, and the upper port of the water inlet and outlet funnel is sealed, so that the upper port is communicated with or cut off from the incubator 1. The area of the cover plate 4 is larger than the section of the upper port of the water outlet funnel, for example, the diameter of the cover plate 4 is 15cm, and the diameter of the upper port of the water outlet funnel is 10cm, so that the cover plate 4 can completely cover the upper port.

The lower port of the water inlet and outlet funnel is communicated with the first end of the water pipe, the second end of the water pipe penetrates out of the incubator 1 and extends to 20cm outside the incubator 1, and a water inlet and outlet 11 is formed at the extending end.

During water injection, the water inlet and outlet 11 is connected with a water pump and serves as a water injection inlet. The cover plate 4 is separated from the upper port of the water inlet and outlet funnel, a filter membrane is arranged, so that seawater flows from the water inlet and outlet funnel to the upper port of the water inlet and outlet funnel after being filtered by the filter membrane, and the seawater overflows from the upper port of the water inlet and outlet funnel, thus completing seawater injection.

When the seawater is discharged, the water pump is disassembled to serve as a water discharge outlet. The cover plate 4 is separated from the upper port of the water inlet and outlet funnel, so that the seawater in the incubator 1 is discharged.

The upper port of the water inlet and outlet funnel is always slightly higher than the upper surface of the sediment layer 2, the section of the upper port of the water inlet and outlet funnel is larger than that of the lower port, the water inlet and outlet funnel has a buffer function on the seawater flowing through the water inlet and outlet funnel, the seawater slowly overflows from the upper port of the water inlet and outlet funnel, and no disturbance is caused to sediment.

The water flow is controlled by adjusting the gap between the cover plate 4 and the upper port. Specifically, in the beginning stage of injecting and discharging seawater, gaps between the cover plate 4 and the upper port are smaller, the cover plate 4 and the upper port of the water inlet and outlet funnel are separated to the maximum interval after the gaps are stable, and the seawater immediately flows out from the interval, so that the water flow is controlled, and the impact disturbance of the water flow on sediment is relieved.

By applying the technical scheme provided by the embodiment of the utility model, when in use, the water discharge and water injection in the process of replacing the seawater are integrated, so that the seawater can be purified and injected, the water replacement process in culture is simpler, more convenient and more efficient, the clean state of the water in the tank can be always kept, and the heights of the water inlet and the water outlet can be changed according to different heights of sediments required by experiments; in the process of replacing the seawater, the sediment is not required to be poured or moved, the sediment is not dispersed by the seawater, namely, the sediment is not disturbed, and the seawater replacement process is simplified.

On the basis of the specific embodiments, the upper port of the water inlet and outlet funnel is higher than the upper surface of the sediment layer 2 by any value between 1 cm and 3cm, including end point values, such as 2cm, and the distance that the upper port of the water inlet and outlet funnel is higher than the upper surface of the sediment layer 2 is moderate, so that the sediment layer 2 can not enter the upper port of the water inlet and outlet funnel; but also can ensure that the upper port of the water inlet and outlet funnel is closer to the upper surface of the sediment layer 2, the potential energy from the upper port of the water inlet and outlet funnel to the upper surface of the sediment layer 2 is smaller, the impact disturbance of water flow to sediment is slowed down, and the seawater of the sediment layer 2 is easily discharged as much as possible.

On the basis of the above-mentioned each concrete embodiment, the business turn over funnel is hemisphere funnel 5, and hemisphere funnel 5 and apron 4's periphery all is provided with the nut, and hemisphere funnel 5 outer wall pitch arc is mild, easily fixed nut. The nut axis of hemisphere type funnel 5 and apron 4 coincide, and the axis direction of nut is the same with the axis direction of hemisphere type funnel 5, and the screw rod is connected in the nut of hemisphere type funnel 5 and apron 4, and the screw rod is adjusted the distance of hemisphere type funnel 5 and apron 4 to the screw rod of screwing. During adjustment, the screw is adjusted to one of the hemispherical funnel 5 and the cover plate 4, and then the gap between the cover plate 4 and the upper port is adjusted to be smaller.

Optionally, nuts are fixed at the upper ends of two sides of the hemispherical funnel 5, the two sides are simultaneously connected with and adjust the height of the cover plate 4, and the connection stability of the cover plate 4 is good; the cover plate 4 and the hemispherical funnel 5 are fixed in relative positions in the horizontal direction, and the stability is good.

In another embodiment, the outer periphery of the hemispherical funnel 5 is provided with two nuts, the upper end of the screw is provided with a step surface, the cover plate 4 is provided with a through hole, and the through hole of the cover plate 4 is detachably lapped on the step surface. During adjustment, the cover plate 4 is firstly taken down from the screw rod, the positions of the screw rod and the hemispherical funnel 5 are adjusted by screwing, and after adjustment, the cover plate 4 is connected to the step surface of the screw rod, so that the gap between the cover plate 4 and the upper port is smaller.

On the basis of the specific embodiments, the upper end of the screw is provided with the knob 3, and the screw is screwed by the knob 3, so that the operation is convenient and labor-saving.

In another more reliable embodiment, on the basis of any one of the above embodiments, the water pipe includes a telescopic hose 6 communicated with the lower port of the water inlet and outlet funnel, and a fixed hard water pipe 8 communicated with the lower end of the telescopic hose 6, and the outer end of the fixed hard water pipe 8 passes out of the incubator 1.

In the structure, the water pipe comprises a telescopic hose 6 and a fixed hard water pipe 8, the telescopic hose 6 is communicated with the lower port of the water inlet and outlet funnel, the length of the telescopic hose 6 is preferably 5-50cm, and the diameter of the telescopic hose is preferably 2-5 cm. The fixed hard water pipe 8 is communicated with the lower end of the telescopic hose 6, the diameter of the fixed hard water pipe 8 is preferably 2-5cm, the length is determined according to the position, and the fixed hard water pipe is preferably extended to 20cm outside the tank. The telescopic hose 6 can be lengthened or shortened, the height of the upper port of the water inlet and outlet funnel can be adjusted by lengthening or shortening the length of the water pipe according to different sediment thicknesses, the upper port of the water inlet and outlet funnel is controlled to be slightly higher than the sediment all the time, and the sediment can be replaced without stirring, and meanwhile, the seawater is ensured to be discharged cleanly.

The telescopic hose 6 can be changed along with the change of the thickness of the sediment according to different requirements of different experiments, so that the seawater replacement process is simplified.

On the basis of the specific embodiments, the axis of the telescopic hose 6 is arranged transversely along the vertical direction, and the axis of the fixed hard water pipe 8 is beneficial to the flow of seawater; the seawater in the incubator 1 is easy to drain, so that the water changing process is simpler, more convenient and more efficient.

The axis of the fixed hard water pipe 8 gradually goes down from the inner end communicated with the telescopic hose 6 to the outer end, and seawater is easy to flow out during drainage, so that accumulated water in the fixed hard water pipe 8 is reduced.

On the basis of the specific embodiments, the incubator further comprises a fixing ring 7, the annular groove of the fixing ring 7 is sleeved on the telescopic hose 6, and the connecting rod of the fixing ring 7 is connected with the incubator 1.

In practical application, the fixing ring 7 comprises a ring groove and a connecting rod, and the connecting rod and the ring groove can be integrally formed, or can be welded or connected by bolts. The ring groove is provided with a notch, the ring groove is sleeved on the telescopic hose 6 from the notch, the other end of the connecting rod is fixedly connected to the incubator 1, the telescopic hose 6 is reinforced through the fixing ring 7, and the telescopic hose 6 is prevented from being toppled over due to impact of seawater and sediments.

Alternatively, the ring groove has elasticity, and is convenient for the ring groove to be sleeved on the telescopic hose 6 from the notch.

Further, the number of the fixing rings 7 is plural, for example, 3, and the telescopic hose 6 is fixed from top to bottom, so that the telescopic hose 6 is ensured to be along the vertical direction.

On the basis of the above embodiments, the outer end of the fixed hard water pipe 8 is provided with a control valve 9.

In practical application, when seawater is discharged, the gap distance between the cover plate 4 and the upper port of the hemispherical funnel 5 is adjusted by rotating the knob 3 at the two sides of the cover plate 4, and the control valve 9 is opened, so that the seawater in the incubator 1 is discharged. When the incubator 1 is filled with seawater, the water inlet and outlet 11 at the lower side is connected with a water pump, the control valve 9 is opened, the gap distance between the cover plate 4 and the upper port is adjusted by adjusting the knob 3 at the two sides of the upper port of the hemispherical funnel 5, so that the water flow is controlled and the impact disturbance of the water flow to sediment is slowed down, when the seawater exists in the incubator, the knob 3 is rotated to close the cover plate 4, the control valve 9 is closed, and the seawater cannot leak under the double functions of water pressure and the valve.

In another more reliable embodiment, on the basis of any one of the above embodiments, the water-passing pipe is provided with a filtering membrane 10 in the pipe at the second end during water injection, and the filtering membrane 10 is detachably connected with the water-passing pipe.

In practical application, when seawater is filled into the incubator 1, the detachable filter membrane 10 is arranged at the water inlet and outlet 11 at the lower side and connected with the water pump in parallel, so that the injected seawater is ensured to contain no other impurities, algae and other components which are unfavorable for the survival of the seaweed 13, the cleanliness of the seawater is ensured, the comfortable living environment of the seaweed 13 is further ensured, and the experimental efficiency is improved; when the seawater is discharged, the filtering membrane 10 of the water inlet and outlet 11 at the lower side and the water pump are disassembled, so that the smooth discharge of the seawater is ensured.

On the basis of the above-mentioned embodiments, the inner wall of the water pipe close to the second end is provided with at least two clamping grooves in a ring shape, the outer wall of the filtering membrane 10 is provided with a clamping block matched with the clamping groove, and the filtering membrane 10 is rotated after the clamping block is clamped into the clamping groove.

In practical application, the inner wall that leads to the water pipe is being close to the second end and the outer wall joint of filtration membrane 10, in the circumferencial direction, the inner wall that leads to the water pipe is being close to the second end is provided with two at least draw-in grooves, and the outer wall of filtration membrane 10 is provided with draw-in groove matched with fixture block. When in connection, the clamping block stretches into the water pipe along the clamping groove, the depth of the clamping block is deeper than that of the clamping groove, then the filtering membrane 10 is rotated, the clamping block is hidden behind the baffle on the side face of the clamping groove, and the baffle seals the clamping block to prevent the filtering membrane 10 from falling out of the water pipe. When the filtering membrane 10 is disassembled, the filtering membrane 10 is rotated, the clamping blocks are overlapped with the clamping grooves, the filtering membrane 10 is taken out from the water pipe, and the filtering membrane 10 and the water pipe are convenient to disassemble and assemble.

Optionally, the filter membrane 10 has a handle thereon for easy rotation and removal of the filter membrane 10.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The sea weed cultivation water changing device provided by the utility model is described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a sea weed is bred and trades water installation, its characterized in that, including inside incubator (1) that has deposit layer (2), insert business turn over water funnel, the first end of deposit layer (2) with the water-passing pipe of business turn over water funnel's lower port intercommunication, the last port cross-section of business turn over water funnel is greater than lower port cross-section, it is provided with and can communicate or cut its open-ended apron (4) to go up port department, apron (4) for the distance of last port is adjustable, the second end of water-passing pipe wears out incubator (1), forms inlet outlet (11), during the water injection inlet outlet (11) are connected with the water pump, the last port of inlet outlet funnel is higher than the upper surface of deposit layer (2).

2. Sea grass cultivation water changing device as claimed in claim 1, characterized in, that the upper port of the water inlet and outlet funnel is 1-3cm higher than the upper surface of the sediment layer (2).

3. The seaweed culture water changing device according to claim 2, wherein the water inlet and outlet funnel is a hemispherical funnel (5), a nut is arranged on the periphery of the hemispherical funnel (5), the axial direction of the nut is the same as that of the hemispherical funnel (5), a screw rod matched with the nut is arranged on the cover plate (4), the screw rod is connected into the nut, and the depth of screwing the screw rod into the nut is adjustable.

4. A seaweed culture water changing device according to claim 3, characterized in that the upper end of the screw is provided with a knob (3).

5. Sea grass cultivation water changing device as claimed in any one of the claims 1-4, characterized in, that the water pipe comprises a telescopic hose (6) communicating with the lower port of the water inlet and outlet funnel, a stationary rigid water pipe (8) communicating with the lower end of the telescopic hose (6), the outer end of the stationary rigid water pipe (8) penetrating out of the incubator (1).

6. Sea grass cultivation water changing device according to claim 5, characterized in, that the axis of the telescopic hose (6) is arranged in a vertical direction, the axis of the stationary rigid water pipe (8) is arranged transversely;

the axis of the fixed hard water pipe (8) gradually descends from the inner end communicated with the telescopic hose (6) to the outer end.

7. The seaweed culture water changing device according to claim 6, further comprising a fixing ring (7), wherein an annular groove of the fixing ring (7) is sleeved on the telescopic hose (6), and a connecting rod of the fixing ring (7) is connected with the incubator (1).

8. Sea grass cultivation water changing device according to claim 5, characterized in, that the outer end of the stationary hard water pipe (8) is provided with a control valve (9).

9. The seaweed culture water changing device according to any one of claims 1 to 4, wherein a filter membrane (10) is arranged in the water pipe at the second end during water injection, and the filter membrane (10) is detachably connected with the water pipe.

10. The seaweed culture water changing device according to claim 9, wherein the water pipe is annularly provided with at least two clamping grooves on the inner wall close to the second end, a clamping block matched with the clamping grooves is arranged on the outer wall of the filtering membrane (10), and the filtering membrane (10) is rotated after the clamping block is clamped into the clamping grooves.