Pulsed jet device and method for killing juvenile hard clam larvae in a body of water

Abstract

The application discloses a kind of pulse jet device for killing in water body of marsh clam larvae, pulse jet device includes main body, control piece, cavity is formed in the inside of main body, the side wall of main body is formed with water inlet and first water jet hole being communicated with cavity, water inlet is suitable for into high pressure water flow in cavity;Control piece is movably arranged on main body and part of control piece extends into cavity, control piece is formed with water blocking part and second water jet hole, when water blocking part is opposite to first water jet hole, first water jet hole is closed, when second water jet hole is opposite to at least part of first water jet hole, jet is carried out to be suitable for killing marsh clam larvae.This pulse jet device of the application can generate strong shear force and turbulent effect by using high pressure jet, destroy the physiological structure of marsh clam larvae by physical method, realize the effective killing of marsh clam larvae.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biological prevention and control technology combining fluid mechanics of hydraulic engineering and environmental protection technology, and particularly relates to a pulse jet device and method for killing Limnoperna fortunei larvae in water. BACKGROUND

[0002] In hydraulic engineering and water body management, the problem of attachment of fouling organisms is widespread, and it is difficult to prevent and control, which has a huge impact on engineering. Among them, Limnoperna fortunei causes serious fouling problems in many water conservancy projects. In water conservancy projects, the attachment of Limnoperna fortunei not only causes mechanical damage to the surface of the facility, but also can cause pipe blockage and increase water flow resistance, thereby affecting the operating efficiency of the entire water conservancy project. In addition, the large-scale reproduction of Limnoperna fortunei can also cause biological invasion to the water ecosystem of the receiving area, destroy the ecological balance, and threaten the survival of local species. However, it is difficult to clean up Limnoperna fortunei once it is attached in large-scale engineering, so effectively preventing and controlling the attachment and spread of Limnoperna fortunei larvae in the early stage is the most effective way to solve the problem of Limnoperna fortunei fouling.

[0003] In related technologies, the traditional method for killing Limnoperna fortunei larvae mainly relies on chemical agents such as chlorides and copper preparations. However, such chemical agents, although can effectively kill the larvae to some extent, have brought many problems. First, the dosage of chemical agents used in a large range of water bodies is difficult to control, and due to the limitation of water body diffusion capacity, the residence time and effective concentration of the agents are difficult to guarantee, and the dosage is difficult to control accurately. Second, the use of chemical agents can cause harm to other non-target organisms such as fish and plankton, and long-term use can even destroy the self-purification capacity of the water body and destroy the ecological balance of the water body. In addition, the killing effect of chemical agents is often significantly affected by environmental factors such as water flow velocity, water temperature, and agent concentration, which makes the killing effect unstable and inconsistent, and the treatment efficiency is low, and the resources and cost consumption are huge. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the purpose of the present application is to propose a pulse jet device and method for killing Limnoperna fortunei larvae in water, which can form a periodic pulse jet and effectively destroy the physiological structure of Limnoperna fortunei larvae to achieve efficient killing.

[0005] The application provides a pulse jet device for killing mussel larvae in a water body. The pulse jet device comprises a main body, a control member, and a cavity formed in the main body. The main body is provided with a water inlet and a first water jet hole communicating with the cavity, and the water inlet is adapted to introduce high-pressure water flow into the cavity. The control member is movably arranged on the main body and partially extends into the cavity. The control member is provided with a water blocking part and a second water jet hole. When the water blocking part is opposite to the first water jet hole, the first water jet hole is closed. When at least part of the second water jet hole is opposite to the first water jet hole, jet flow is generated to kill the mussel larvae.

[0006] The pulse jet device according to the application can generate strong shear force and turbulent effect by using high-pressure jet flow, physically destroy the physiological structure of the mussel larvae, effectively kill the mussel larvae, reduce the number of mussel larvae, and prevent the spread of mussel larvae. The strong shear flow is also beneficial to cleaning the mussel attached to the surface of the facility and reducing the mussel attachment problem. While effectively killing, the pulse jet device does not pollute the water body and the ecological environment, and is beneficial to protecting non-target organisms and ecological balance. In addition, the aperture of the jet hole and the jet frequency of the pulse jet device are variable. By adjusting the relevant parameters, the pulse jet device can adapt to different water flow conditions, improve the adaptability of the pulse jet device to the water environment, and optimize the killing effect.

[0007] According to some embodiments of the application, the control member comprises a control plate and a driving member. The control plate is provided with a water blocking part and a second water jet hole. The driving member is arranged on the main body and is provided with a movable end connected to the control plate to drive the control plate to move relative to the main body.

[0008] According to some embodiments of the application, a first limiting groove and a second limiting groove are formed in the cavity. The openings of the first limiting groove and the second limiting groove are opposite to each other, and one side of the first limiting groove and the second limiting groove is flush with the side wall of the main body. The control plate is movably arranged between the first limiting groove and the second limiting groove, and the side of the control plate facing the first water jet hole is tightly attached to the side wall of the main body.

[0009] According to some embodiments of the application, the first water jet hole is configured as a plurality of first water jet holes, and the plurality of first water jet holes are arranged at intervals along the extension direction of the main body. The second water jet hole is configured as a plurality of second water jet holes corresponding to the first water jet holes one by one, and the plurality of second water jet holes are arranged at intervals along the extension direction of the control plate. The water blocking part is defined between adjacent two second water jet holes.

[0010] According to some embodiments of the application, the driving member comprises a lead screw and a sleeve. The lead screw is provided with an external thread on the outer periphery, and is adapted to be connected to a driving part. The sleeve is provided with an internal thread matched with the external thread in the inside, and is connected to the control plate.

[0011] According to some embodiments of the application, the main body comprises a matching member adapted to be slidably connected with the sleeve.

[0012] According to some embodiments of the present application, the main body comprises a sealing member adapted to seal the cavity.

[0013] According to some embodiments of the present application, the main body is formed with an ear plate, and the ear plate is formed with a plurality of mounting holes.

[0014] The present application also provides a method for killing juvenile clams in a water body, which uses the pulse jet device described above, and comprises the following steps: obtaining environmental parameters of a target water body region; determining pulse jet parameters of the pulse jet device according to the environmental parameters, and operating the pulse jet device according to the pulse jet parameters.

[0015] According to some embodiments of the present application, the method for killing juvenile clams in a water body further comprises: monitoring the turbulent characteristics and killing effect of the pulse jet device; and optimizing the pulse jet parameters of the pulse jet device according to the monitoring results.

[0016] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0018] Figure 1 is a structural schematic diagram of a pulse jet device according to some embodiments of the present application;

[0019] Figure 2 is a structural schematic diagram of a main body of a pulse jet device according to some embodiments of the present application;

[0020] Figure 3 is a sectional structural schematic diagram of a main body of a pulse jet device according to some embodiments of the present application;

[0021] Figure 4 is a structural schematic diagram of a control member of a pulse jet device according to some embodiments of the present application;

[0022] Figure 5 is a schematic diagram of the installation of a pulse jet device according to some embodiments of the present application;

[0023] Figure 6 is a schematic diagram of the use of a pulse jet device according to some embodiments of the present application;

[0024] Figure 7 is a flow schematic diagram of the use of a pulse jet device according to some embodiments of the present application to kill juvenile clams;

[0025] Figure 8is a schematic diagram of the destruction of a clam larva under the action of the pulse jet device of the present application.

[0026] Reference signs:

[0027] Body 10; cavity 11; water inlet 12; first water jet hole 13; sealing member 14; fitting member 15; ear plate 16; mounting hole 17; first limiting groove 18; second limiting groove 19;

[0028] Control member 20; control plate 21; water blocking part 211; second water jet hole 212; driving member 22; screw rod 221; sleeve 222. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0030] Reference is made below Figures 1-4 A pulse jet device according to an embodiment of the present application is described.

[0031] The present application provides a pulse jet device for killing clam larvae in water, which comprises a body 10 and a control member 20. The body 10 is internally formed with a cavity 11. The body 10 is formed with a water inlet 12 and a first water jet hole 13, which communicate with the cavity 11. The water inlet 12 is adapted to introduce high-pressure water flow into the cavity 11. The control member 20 is movably arranged on the body 10 and part of the control member 20 extends into the cavity 11. The control member 20 is formed with a water blocking part 211 and a second water jet hole 212. When the water blocking part 211 is opposite to the first water jet hole 13, the first water jet hole 13 is closed. When the second water jet hole 212 is opposite to at least part of the first water jet hole 13, the second water jet hole 212 performs jetting to kill the clam larvae.

[0032] According to the pulse jet device, the water supply system such as a water pump can be connected through the water inlet 12, and the water pump can be selected to have a large lift to supply high-pressure water flow into the cavity 11 to form a high-pressure environment in the cavity 11. Under the action of water pressure, the water in the cavity 11 can be sprayed outward through the first water jet hole 13. The control member 20 can control the opening and closing of the first water jet hole 13. When the water blocking part 211 is opposite to the first water jet hole 13, the first water jet hole 13 is closed, and the water pressure in the cavity 11 is increased. When at least part of the second water jet hole 212 is opposite to the first water jet hole 13, at least part of the first water jet hole 13 is opened, and the part of the first water jet hole 13 opposite to the second water jet hole 212 forms a jet hole, and the high-pressure water can be sprayed out of the jet hole. The opposite area of the first water jet hole 13 and the second water jet hole 212 determines the diameter and area of the jet hole, and the area of the jet hole affects the jet intensity. When the high-pressure water jet flows into the environment water body from the jet hole, it will form a strong disturbance to the environment water body, generate shear force and strong turbulent effect, and the shear force concentrates to destroy the shell and inner cyst structure of the clam larvae, thereby achieving the killing of the clam larvae. The damage of the jet to the clam larvae is shown in Figure 8

[0033] According to the pulse jet device, the high-pressure jet can generate strong shear force and turbulent effect, physically destroy the physiological structure of the clam larvae, and effectively kill the clam larvae, which is beneficial to reduce the number of clams, prevent the spread and attachment of clams, and clean the clams attached to the surface of the facility. At the same time, the strong shear flow is also beneficial to clean the clams attached to the surface of the facility, and reduce the problem of clam attachment. While efficiently killing, it will not pollute the water body and ecological environment, which is beneficial to protect non-target organisms and ecological balance, and avoid negative effects on the water body and surrounding environment. In addition, the diameter of the jet hole of the pulse jet device, the jet water pressure and the jet frequency can be changed, and by adjusting the related parameters, the pulse jet device can adapt to different water flow conditions, so that it can play a stable killing effect under different water flow conditions, and improve the adaptability of the pulse jet device to the water environment. At the same time, the killing effect of the device can be optimized by adjusting the related parameters during operation.

[0034] According to some embodiments of the present application, the control member 20 includes a control plate 21 and a driving member 22. The control plate 21 is formed with a water blocking part 211 and a second water jet hole 212. The driving member 22 is arranged on the main body 10, and the driving member 22 is formed with a movable end connected with the control plate 21 to drive the control plate 21 to move relative to the main body 10. In this embodiment, as shown in Figure 4

[0035] ​​In some embodiments, the driving member 22 can drive the control plate 21 to move periodically, so as to intermittently generate the jet flow to generate strong shear turbulence in the water body.

[0036] According to some embodiments of the present application, the first limiting groove 18 and the second limiting groove 19 are formed in the cavity 11, the openings of the first limiting groove 18 and the second limiting groove 19 are opposite to each other, and one side of the first limiting groove 18 and the second limiting groove 19 is flush with the side wall of the main body 10; the control plate 21 is movably arranged between the first limiting groove 18 and the second limiting groove 19, and the side of the control plate 21 facing the first water jet hole 13 is tightly attached to the side wall of the main body 10. In the present embodiment, as shown in Figure 3 , the first limiting groove 18 and the second limiting groove 19 are in sliding connection with the control plate 21, and the control plate 21 can only move along the extension direction of the first limiting groove 18 and the second limiting groove 19 under the restriction of the first limiting groove 18 and the second limiting groove 19; since one side of the first limiting groove 18 and the second limiting groove 19 is flush with the side wall of the main body 10, the first limiting groove 18 and the second limiting groove 19 can ensure that one side of the control plate 21 is tightly attached to the side wall of the main body 10, thereby ensuring the effective control of the control plate 21 on the opening and closing state of the first water jet hole 13.

[0037] According to some embodiments of the present application, the first water jet hole 13 is configured as a plurality of first water jet holes 13, and the plurality of first water jet holes 13 are arranged at intervals along the extension direction of the main body 10; the second water jet hole 212 is configured as a plurality of second water jet holes 212 corresponding to the first water jet hole 13 one by one, and the plurality of second water jet holes 212 are arranged at intervals along the extension direction of the control plate 21, and the water blocking part 211 is defined between adjacent two second water jet holes 212. In the present embodiment, as shown in Figure 1 , 2 , the first water jet hole 13 and the second water jet hole 212 are arranged as a plurality of holes, which can expand the turbulence range of the jet flow and improve the killing effect and efficiency of the pulsed jet flow device on the juvenile clam.

[0038] In addition, in the present embodiment, the turbulence range generated by the jet flow can be adjusted by the interval design between the first water jet holes 13.

[0039] Further, in the operation process of the pulsed jet flow device, the stroke range of the control plate 21 is limited between two first water jet holes 13 that are separated by one first water jet hole 13, and is limited by the nearest edge of the first water jet hole 13. In this way, each second water jet hole 212 and each water blocking part 211 can control one first water jet hole 13 in a targeted manner, which can simplify the structure and make the structure easy to control.

[0040] According to some embodiments of the present application, the driving member 22 comprises a screw rod 221 and a sleeve 222, the screw rod 221 is provided with external threads on the outer periphery, and the screw rod 221 is adapted to be connected with the driving component; the sleeve 222 is provided with internal threads on the inner periphery, and the sleeve 222 is connected with the control plate 21. In the present embodiment, the driving rod converts the rotation into the linear motion of the sleeve 222 through the threaded connection, and the sleeve 222 is connected with the connecting member to drive the control plate 21 to move linearly along the extension direction of the control plate 21.

[0041] In some embodiments, the driving component can be an electric motor, which is controlled by a frequency converter to adjust the moving frequency of the control plate 21 according to the operation requirement of the pulse jet device, so as to adjust the jet frequency.

[0042] In some embodiments, the end of the screw rod is provided with a crankshaft to be connected with the driving component.

[0043] According to some embodiments of the present application, the main body 10 comprises a matching member 15, which is adapted to be connected with the sleeve 222. In the present embodiment, the main body 10 is provided with the matching member 15 to realize the installation of the control member 20 on the main body 10. In some embodiments, as shown in Figure 2 the matching member 15 can be configured as a linear bearing, which is connected with the sleeve 222 in a sliding manner to adapt to the relative movement of the sleeve 222 to the main body 10 to drive the control plate 21 to move. In some embodiments, the main body 10 is further provided with a limiting member, which is adapted to limit the movement of the screw rod 221 along the extension direction of the main body 10, so that only the relative rotation between the screw rod 221 and the main body 10 occurs to ensure that the sleeve 222 can move linearly relative to the linear bearing.

[0044] According to some embodiments of the present application, the main body 10 comprises a sealing member 14, which is adapted to seal the container cavity 11. It should be noted that, in some embodiments, in order to facilitate the extension of the control plate 21 into the main body 10 or for the need of structural processing and assembly, the main body 10 is provided with an opening, and in the present embodiment, as shown in Figure 2 the opening can be sealed by the sealing member 14 to ensure that a high-pressure water environment can be formed in the container cavity 11.

[0045] According to some embodiments of the present application, the main body 10 is formed with an ear plate 16, and the ear plate 16 is formed with a plurality of mounting holes 17. As shown in Figure 2 the present embodiment can install the main body 10 in the aqueduct or the channel by providing the ear plate 16 and the mounting holes 17, and the installation mode is flexible and convenient for later maintenance. In some embodiments, the main body 10 is welded by stainless steel.

[0046] As shown in Figure 5As shown, the pulse jet device can be arranged simultaneously when applied, so as to form a larger range of turbulent effect in the water body, so as to realize efficient killing of the clam larvae; meanwhile, the spread and aggregation of the clam larvae can be effectively avoided, and the killing efficiency is significantly improved.

[0047] The pulse jet device of the present application is mainly used in water areas with serious clam attachment. Through killing of the clam larvae and cleaning of the attached clams, the spread and aggregation of the clam larvae can be effectively avoided, and the killing of the clam larvae can be effectively realized. The pulse jet device of the present application is especially suitable for low-flow water areas, can generate strong turbulence and high shear force, and has remarkable killing effect.

[0048] In application, the pulse jet device is arranged in the aqueduct or channel of the target water area, and can be arranged at the bottom or side wall of the aqueduct, so as to ensure that the pulse water flow covers the area where the larvae may attach; by adjusting the size of the jet hole and the power and frequency of the water pump, the pulse jet device can generate appropriate pulse jet strength and jet frequency.

[0049] The present application also provides a method for killing clam larvae in water, which uses the above pulse jet device and comprises the following steps: obtaining environmental parameters of the target area; determining pulse jet parameters of the pulse jet device according to the environmental parameters, and operating the pulse jet device according to the pulse jet parameters.

[0050] According to some embodiments of the present application, the environmental parameters of the target water area include flow information, water quality parameters and clam larvae parameters, and the step of obtaining the environmental parameters of the target water area specifically comprises: using a YSI EXO multi-parameter water quality analyzer to measure water quality parameters such as water temperature, pH, dissolved oxygen and conductivity on site; using a microscope to observe the morphology and activity of the clam larvae, and counting parameters such as larval density, living density and mortality rate; using a sensing device to monitor flow field, flow rate and turbulent characteristics of the target water body. According to the above environmental parameters, the jet hole size, jet frequency and jet flow rate of the pulse jet device are adjusted according to the water body conditions and the distribution of the clam larvae, and the pulse jet device is operated. In addition, the geometric parameters of the pulse jet device, including the spacing of the jet holes, can be reasonably designed according to the environmental parameters.

[0051] In order to improve the killing effect of the pulse jet device, the best operating parameters of the pulse jet device need to be determined to generate the best turbulent effect, so as to ensure that the turbulent effect can destroy the structure of the larvae and cover the effective target area. Therefore, according to some embodiments of the present application, the method for killing clam larvae in water further comprises: monitoring the turbulent characteristics and killing effect of the pulse jet device; and optimizing the pulse jet parameters according to the monitoring results.

[0052] Specifically, the method for killing the clam larvae in the water body includes verification of the killing effect of the pulse jet on the clam larvae and adjustment of the device. As shown in Figure 6 During the operation of the pulse jet device, test points are set in the turbulent range of the test water body to monitor the survival rate of the clam larvae at the test points, so as to evaluate the killing effect of the clam larvae. During the verification process, the Kappa coefficient and the F1 value can be used as indicators to evaluate the accuracy of the killing effect. As shown in Figure 7 If the killing effect is not good, the duration and related parameters of the pulse jet device, including the size of the jet hole, the jet frequency and the flow rate, are continuously adjusted based on the environmental parameters and the monitoring results. If the killing effect is good, the pulse jet device can be continuously operated to achieve large-scale and effective killing of the clam larvae.

[0053] In some embodiments, test points can also be set upstream and downstream of the test water body to compare and analyze the killing effect of the clam larvae.

[0054] In addition, to further improve the performance of the pulse jet device, the method for killing the clam larvae in the water body also includes monitoring and analysis of the jet turbulent performance of the pulse jet device and adjustment of the device. Specifically, during the operation of the pulse jet device, the ADV (acoustic Doppler velocimeter) is used to measure the water flow velocity time series at different spatial positions of the water body, and the turbulent conditions at different spatial positions after the jet are analyzed based on the measurement results.

[0055] Specifically, the measuring point is 5 cm away from the ADV probe in a straight line to reduce the disturbance of the probe on the water flow at the measuring point. The sampling frequency is set to 100 Hz, and the single-point sampling time is 4 minutes. When measuring the flow rate, the ADV is fixed on a self-made moving bracket. The bracket is equipped with a guide rail with a bearing block. The ADV body can be fixed to a depth ruler (with an accuracy of 0.1 mm) and can move vertically along the depth ruler. The depth ruler is fixed on the sliding block, so that the ADV probe can move horizontally along the bracket guide rail (equipped with a level with an accuracy of 1 mm). By combining the movements, the position of the ADV probe can be accurately determined.

[0056] In some embodiments, the ADV data needs to be preprocessed to remove data with SNR<20 and COR<70, and to remove burr data by using the sampling phase space threshold method, and to perform noise reduction processing on the data. Based on the ADV preprocessed data, the time-averaged flow velocity field and the corresponding turbulent parameters (Reynolds stress, turbulent intensity, turbulent total energy TKE, turbulent dissipation rate, energy spectrum, etc.) distribution at each measuring point are calculated, and the energy spectrum of each measuring point is further calculated. Based on the analysis results of the above turbulent conditions, the jet parameters of the pulse jet device can be further optimized.

[0057] Further, the above monitoring process carries out multiple sets of test operations, compares and analyzes the effective operation water body range under different operation parameters; compares and analyzes the turbulence performance difference under the influence of different layout methods, focuses on analyzing key parameters such as high-frequency pulsation proportion, three-dimensional turbulence intensity contribution rate, and turbulence structure characteristic scale; compares and analyzes the turbulence performance difference under the influence of different flow rates, focuses on analyzing key parameters such as high-frequency pulsation proportion, three-dimensional turbulence intensity contribution rate, and turbulence structure characteristic scale. The optimal layout parameters of the pulse jet device are determined through comparative analysis, and the use performance of the pulse jet device is improved.

[0058] To ensure the stability and effectiveness of the killing effect, during the operation of the pulse jet device, the above examples collect larva samples in the upstream and downstream water bodies, and use acoustic equipment to monitor parameters such as turbulence intensity, Reynolds stress, and turbulence dissipation rate of the water flow in real time. By comparing the number and mortality rate of larvae in the upstream and downstream samples, the killing effect of the pulse jet device is compared and analyzed, and whether the pulse jet parameters need to be further optimized is determined based on the killing effect.

[0059] Based on the above pulse jet device and the method for killing marsh clam larvae in water bodies, the present application proposes a marsh clam larva killing system, which comprises:

[0060] A monitoring system is used to obtain environmental parameters before the operation of the pulse jet device, to collect water flow information, water body parameters, and marsh clam larva distribution parameters of the target water area; and to monitor jet turbulence characteristic parameters and marsh clam larva changes in the upstream and downstream of the target water body during the operation of the pulse jet device.

[0061] A pulse jet device generates jet flow in a target range to generate shear force and turbulence effect, thereby achieving marsh clam larva killing.

[0062] A turbulence control system comprises control structures such as water pumps, motors, and computers, the water pump is used to inject high-pressure water flow into the pulse jet device to generate jet flow meeting the preset requirements; the motor is used to control the jet flow intensity and jet flow frequency; during the operation of the pulse jet device, the turbulence control system adjusts and determines the jet flow parameters of the pulse jet device based on the monitoring results of the monitoring system, so as to generate sufficient turbulent flow field and shear force, cover the target area range, and achieve effective killing of marsh clam larvae.

[0063] The device can realize real-time monitoring and immediate processing of marsh clam larvae in water bodies through linkage with the monitoring system and the turbulence control system; can improve the automation degree of marsh clam larva killing, reduce maintenance requirements, reduce manual intervention, improve the adaptability to complex environments, and is suitable for large-scale water area marsh clam management applications.

[0064] According to the above pulse jet device and method, tests are carried out under the following test conditions:

[0065] The number of the first water spraying holes 13 is n=14, the diameter of the jet holes is d=0.05m; the water pump flow of the control pulse jet device is Q=300m 3 / s, the flow of each jet hole is about q=Q / n=0.00595m 3 / s, the jet velocity V is about 2.38m / s. According to the calculation of 20% proportion, the turbulent velocity V 紊动 is about 0.48m / s. According to the estimation of the turbulent field diffusion range by the empirical formula, the jet radius R is about 0.3m, and the radius R 紊动 of the turbulent effect influence range is about 0.3m.

[0066] Through the monitoring calculation, the pulse jet device can achieve 100% killing of the target range of the clam larvae, and the destruction of the clam larvae under the action of the pulse jet device is as shown in Figure 8 .

[0067] The above test proves that the pulse jet device can effectively kill the clam larvae and greatly reduce the spread of the larvae. In the engineering practical application, the device can flexibly adjust its operation parameters according to the working conditions and conditions of different water bodies, so as to ensure that it can play a significant killing effect in various complex water flow environments.

[0068] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0069] In the description of the present application, "first feature" and "second feature" can include one or more features.

[0070] In the description of the present application, "a plurality of" means two or more.

[0071] In the description of the present application, "above" or "below" the first feature in the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0072] In the description of the present application, above, over and on with respect to a first feature and a second feature include the first feature directly on and obliquely on the second feature, or simply mean that the first feature is horizontally higher than the second feature.

[0073] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, alternatives and variations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pulse jet device for killing clam larvae in water, characterized in that: include: A main body, wherein a cavity is formed inside the main body, and a water inlet and a first water spray hole are formed on the main body and communicate with the cavity, wherein the water inlet is suitable for introducing high-pressure water into the cavity; A control member is movably arranged on the main body and a portion of the control member extends into the cavity. The control member is formed with a water blocking portion and a second water spray hole. When the water blocking portion is opposite to the first water spray hole, the first water spray hole is closed. When the second water spray hole is opposite to at least a portion of the first water spray hole, a jet is generated to kill the larvae of the marsh clam.

2. The pulse jet device for killing larvae of the marsh clam in water according to claim 1, characterized in that: The control element includes: a control plate, the control plate being formed with the water blocking portion and the second water spray hole; A driving member is provided on the main body, and the driving member is formed with a movable end, and the movable end is connected to the control board so as to be suitable for driving the control board to move relative to the main body.

3. The pulse jet device for killing clam larvae in water according to claim 2, characterized in that: A first limiting groove and a second limiting groove are formed in the cavity, the openings of the first limiting groove and the second limiting groove are directly opposite to each other, and one side of the first limiting groove and the second limiting groove is flush with the side wall of the main body; The control panel is movably disposed between the first limiting groove and the second limiting groove, and a side of the control panel facing the first water spray hole is in close contact with the side wall of the main body.

4. The pulse jet device for killing larvae of the marsh clam in water according to claim 2, characterized in that: The first water spray holes are constructed in a plurality, and the plurality of first water spray holes are arranged at intervals along the extension direction of the main body; the second water spray holes are constructed in a plurality corresponding to the first water spray holes one by one, and the plurality of second water spray holes are arranged at intervals along the extension direction of the control board, and the water blocking portion is defined between two adjacent second water spray holes.

5. The pulse jet device for killing clam larvae in water according to claim 2, characterized in that: The driving member includes: A screw rod, wherein an external thread is formed on the outer circumference of the screw rod, and the screw rod is suitable for connecting with a driving component; A sleeve is formed with an internal thread matching the external thread, and the sleeve is connected to the control board.

6. The pulse jet device for killing larvae of the marsh clam in water according to claim 5, characterized in that: The subject includes: A fitting piece is adapted to be slidably connected with the sleeve.

7. The pulse jet device for killing larvae of the marsh clam in water according to claim 1, characterized in that: The subject includes: A sealing member is adapted to seal the cavity.

8. The pulse jet device for killing larvae of the marsh clam in water according to claim 1, characterized in that: The main body is formed with an ear plate, and the ear plate is formed with a plurality of mounting holes.

9. A method for killing larvae of limpet clams in water, characterized in that: The pulse jet device according to any one of claims 1 to 6 is characterized in that it includes the following steps: Obtain environmental parameters of the target water area; The pulse jet parameters of the pulse jet device are determined according to the environmental parameters, and the pulse jet device is operated according to the pulse jet parameters.

10. The method for killing larvae of the marsh clam in water according to claim 9, characterized in that: Also includes: monitoring the turbulence characteristics and killing effect of the pulse jet device; The pulse jet parameters of the pulse jet device are optimized according to the monitoring results.

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