Pulse jet device and method for killing larvae of macrobrachium fortunei in water body

Abstract

The invention discloses a pulse jet device for killing larvae of Macrobrachium fortunei in a water body, the pulse jet device comprises a main body and a control piece, a containing cavity is formed in the main body, a water inlet and a first water spraying hole which are communicated with the containing cavity are formed in the side wall of the main body, and the water inlet is suitable for introducing high-pressure water flow into the containing cavity; the control part is movably arranged on the main body, a part of the control part extends into the containing cavity, a water blocking part and a second water spraying hole are formed in the control part, the first water spraying hole is closed when the water blocking part is right opposite to the first water spraying hole, and jet flow is carried out when the second water spraying hole is at least partially right opposite to the first water spraying hole so as to be suitable for killing the larvae of the macrobrachium fortunei. According to the pulse jet flow device, high-pressure jet flow can be utilized to generate strong shearing force and turbulent fluctuation effect, the physiological structure of the larvae of the macrobrachium fortunei is destroyed in a physical mode, and effective killing of the larvae of the macrobrachium fortunei is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of biological control combining hydraulic engineering fluid mechanics with environmental protection technology, and in particular to a pulse jet device and method for killing larvae of limpet larvae in water bodies. Background Art

[0002] In water conservancy projects and water body management, the problem of attachment of fouling organisms is common, and its prevention and control is difficult, and the impact on the project is huge. Among them, the freshwater mussel Limnoperna fortunei has caused serious fouling problems in many water conservancy projects. In water conservancy projects, the attachment of Limnoperna fortunei will not only cause mechanical damage to the surface of the facilities, but may also cause pipe blockage and increased water flow resistance, thereby affecting the operating efficiency of the entire water conservancy project. In addition, the large-scale reproduction of Limnoperna fortunei may also cause biological invasion of the aquatic ecosystem in the receiving area, destroy the ecological balance, and threaten the survival of local species. However, it is difficult to stop water for maintenance in large-scale projects, and once Limnoperna fortunei is attached, it is difficult to clean it. Therefore, effectively preventing and controlling the attachment and spread of Limnoperna fortunei larvae in the early stages is the most effective way to solve the fouling of Limnoperna fortunei.

[0003] In the related art, the traditional method of killing larvae of the marsh clam mainly relies on chemical agents, such as chloride and copper preparations. However, although such chemical agents can effectively kill larvae to a certain extent, their use also brings many problems. First, the dosage of chemical agents used in a large range of water bodies is difficult to control. Due to the limitations of the diffusion capacity of the water body, the residence time and effective concentration of the agent are difficult to guarantee, and it is difficult to accurately control the dosage. Secondly, the use of chemical agents may cause harm to other non-target organisms such as fish and plankton. Long-term use may even destroy the self-purification ability 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 its killing effect unstable and inconsistent, and the processing efficiency is low, and the consumption of resources and costs is huge. Summary of the invention

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

[0005] The present application proposes a pulse jet device for killing larvae of swamp clams in water bodies. The pulse jet device includes a main body and a control component. A cavity is formed inside the main body. The main body is formed with a water inlet and a first water spray hole connected to the cavity. The water inlet is suitable for introducing a high-pressure water flow into the cavity. The control component is movably arranged on the main body and a part of the control component extends into the cavity. The control component is formed with a water blocking portion and a second water spray hole. When the water blocking portion is directly opposite to the first water spray hole, the first water spray hole is closed. When the second water spray hole is directly opposite to at least a part of the first water spray hole, a jet is performed to kill the larvae of swamp clams.

[0006] According to the pulse jet device of the present application, a high-pressure jet can be used to generate a strong shear force and turbulent effect, and the physiological structure of the clam larvae can be destroyed by physical means to achieve effective killing of the clam larvae, which is beneficial to reduce the number of clams and prevent the spread of clams; at the same time, the strong shear flow is also beneficial to clean the clams attached to the surface of the facility and alleviate the problem of clam attachment. While efficiently killing, it will not pollute the water body and the ecological environment, which is beneficial to protecting non-target organisms and ecological balance. In addition, the aperture and jet frequency of the jet hole of the pulse jet device are variable. By adjusting the relevant parameters, the pulse jet device can adapt to different water flow conditions and improve the adaptability of the pulse jet device to the water environment; at the same time, the killing effect can be optimized by adjusting the relevant parameters.

[0007] According to some embodiments of the present application, the control member includes a control panel and a driving member; the control panel is formed with a water blocking portion and a second water spray hole; the driving member is arranged on the main body, and the driving member is formed with a movable end, which is connected to the control panel so as to be suitable for driving the control panel to move relative to the main body.

[0008] According to some embodiments of the present 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 are 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 spray hole is tightly attached to the side wall of the main body.

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

[0010] According to some embodiments of the present application, the driving member includes a screw and a sleeve. An external thread is formed on the outer periphery of the screw, and the screw is suitable for connecting with the driving member; an internal thread matching the external thread is formed in the sleeve, and the sleeve is connected to the control panel.

[0011] According to some embodiments of the present application, the main body includes: a fitting piece, and the fitting piece is suitable for being slidably connected with the sleeve.

[0012] According to some embodiments of the present application, the main body includes: a sealing member, and the sealing member is suitable for sealing 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 proposes a method for killing clam larvae in water bodies, using the above-mentioned pulse jet device, including the following steps: obtaining environmental parameters of the target water body area; determining the 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 marsh clam larvae in water bodies also includes: monitoring the turbulence 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 invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

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

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

[0020] Figure 3 is a schematic cross-sectional view of the main structure of a pulse jet device according to some embodiments of the present application;

[0021] Figure 4 is a schematic diagram of the control structure 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 It is a schematic diagram of the pulse jet device of the present application in use;

[0024] Figure 7 It is a schematic diagram of the process of killing larvae of swamp clams using the pulse jet device of the present application;

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

[0026] Reference numerals:

[0027] Main body 10; cavity 11; water inlet 12; first water spray hole 13; sealing member 14; matching member 15; ear plate 16; mounting hole 17; first limiting groove 18; second limiting groove 19;

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

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

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

[0031] The present application proposes a pulse jet device for killing larvae of swamp clams in water bodies. The pulse jet device includes a main body 10 and a control component 20. A cavity 11 is formed inside the main body 10. The main body 10 is formed with a water inlet 12 and a first water spray hole 13 connected to the cavity 11. The water inlet 12 is suitable for introducing a high-pressure water flow into the cavity 11. The control component 20 is movably arranged on the main body 10 and a part of the control component 20 extends into the cavity 11. The control component 20 is formed with a water blocking portion 211 and a second water spray hole 212. When the water blocking portion 211 is directly opposite to the first water spray hole 13, the first water spray hole 13 is closed. When the second water spray hole 212 is directly opposite to at least a part of the first water spray hole 13, a jet is performed to kill the larvae of swamp clams.

[0032] According to the pulse jet device of the present application, a water supply system such as a water pump can be connected through the water inlet 12. The water pump can select a larger head to pass high-pressure water into the cavity 11, so that a high-pressure environment is formed in the cavity 11; under the action of water pressure, the water in the cavity 11 can be sprayed outward through the first water spray hole 13; the control member 20 can control the opening and closing of the first water spray hole 13. When the water blocking portion 211 is directly opposite to the first water spray hole 13, the first water spray hole 13 is closed, and the water pressure in the cavity 11 is increased; when the second water spray hole 212 is directly opposite to at least part of the first water spray hole 13, at least part of the first water spray hole 13 is opened, and the part directly opposite to the first water spray hole 13 and the second water spray hole 212 forms a jet hole, and high-pressure water can be sprayed out from the jet hole. Among them, the directly opposite area of ​​the first water spray hole 13 and the second water spray hole 212 determines the aperture and area of ​​the jet hole, and the area of ​​the jet hole affects the jet intensity. When high-pressure water flows from the jet hole into the surrounding water, it will cause strong disturbance to the surrounding water, generate shear force and strong turbulence effect, and the concentrated shear force will destroy the shell and inner capsule structure of the larvae of the marsh clam, thus killing the larvae of the marsh clam. Figure 8 As shown in Figure 2, the shear flow and turbulence intensity generated by the jet are related to the jet intensity and jet frequency.

[0033] According to the pulse jet device of the present application, the high-pressure jet can generate strong shear force and turbulence effect, destroy the physiological structure of the clam larvae by physical means, achieve effective killing of the clam larvae, and help reduce the number of clams and prevent the spread and attachment of clams; at the same time, the strong shear flow is also conducive to cleaning the clams attached to the surface of the facility and alleviating the problem of clam attachment. While efficiently killing, it will not pollute the water body and the ecological environment, which is conducive to protecting non-target organisms and ecological balance, and avoiding negative impacts on the water body and the surrounding environment. In addition, the aperture, jet water pressure and jet frequency of the jet hole of the pulse jet device can all be changed. By adjusting the relevant parameters, the pulse jet device can be adapted to different water flow conditions, so that it can exert 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 can be optimized by adjusting the relevant parameters during the operation of the device.

[0034] According to some embodiments of the present application, the control member 20 includes a control panel 21 and a driving member 22; the control panel 21 is formed with a water blocking portion 211 and a second water spray hole 212; the driving member 22 is disposed on the main body 10, and the driving member 22 is formed with a movable end, and the movable end is connected to the control panel 21 so as to drive the control panel 21 to move relative to the main body 10. In this embodiment, Figure 4 As shown, the opening and closing control of the first water spray hole 13 is realized by the control panel 21, and the movement of the control panel 21 is realized by the driving member 22. The structure is simple and easy to operate and run in a water environment.

[0035] In some embodiments, the driving member 22 can drive the control plate 21 to perform periodic motion, thereby intermittently performing jets to generate strong shear turbulence in the water body.

[0036] According to some embodiments of the present application, a first limiting groove 18 and a 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 directly opposite, 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 board 21 is movably arranged between the first limiting groove 18 and the second limiting groove 19, and the side of the control board 21 facing the first water spray hole 13 is in close contact with the side wall of the main body 10. In this embodiment, as Figure 3 As shown, the first limit groove 18 and the second limit groove 19 are slidably connected to the control plate 21, and the control plate 21 can only move along its extension direction under the limiting action of the first limit groove 18 and the second limit groove 19; since one side of the first limit groove 18 and the second limit groove 19 is flush with the side wall of the main body 10, the first limit groove 18 and the second limit groove 19 can ensure that one side of the control plate 21 is close to the side wall of the main body 10, thereby ensuring that the control plate 21 effectively controls the opening and closing state of the first water spray hole 13.

[0037] According to some embodiments of the present application, the first water spray hole 13 is configured as a plurality of first water spray holes 13, and the plurality of first water spray holes 13 are arranged at intervals along the extension direction of the main body 10; the second water spray holes 212 are configured as a plurality of first water spray holes 13 corresponding to each other, and the plurality of second water spray holes 212 are arranged at intervals along the extension direction of the control board 21, and a water blocking portion 211 is defined between two adjacent second water spray holes 212. In this embodiment, Figure 1 , 2 As shown, the first water spray hole 13 and the second water spray hole 212 are set to be multiple, which can expand the turbulence range of the jet and improve the killing effect and killing efficiency of the pulse jet device on the larvae of the swamp clam. Since the water blocking portion 211 is formed between two adjacent second water spray holes 212, the area directly facing the water blocking portion 211 and the second water spray hole 212 and the first water spray hole 13 can be changed when the control plate 21 moves, that is, the duty cycle of the first water spray hole 13 is changed, the size of the jet hole is changed, and the jet performance such as the jet intensity is affected.

[0038] In addition, in this embodiment, the range of turbulence generated by the jet flow can be adjusted by designing the spacing between the first water spray holes 13 .

[0039] Furthermore, during the operation of the pulse jet device, the travel range of the control plate 21 is limited between two first water spray holes 13 separated by one first water spray hole 13, and is limited to the nearest edge of the first water spray hole 13. In this way, each second water spray hole 212 and each water blocking portion 211 specifically controls one first water spray hole 13, 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 includes a screw rod 221 and a sleeve 222. The screw rod 221 is formed with an external thread on its outer periphery, and the screw rod 221 is suitable for connecting with the driving member; the sleeve 222 is formed with an internal thread that matches the external thread, and the sleeve 222 is connected to the control board 21. In this embodiment, the driving rod converts the rotation into the linear motion of the sleeve 222 through the threaded fit, and the sleeve 222 is connected to the connecting member to drive the control board 21 to move linearly along the extension direction of the control board 21.

[0041] In some embodiments, the driving component may be a motor, which is controlled by a frequency converter. The movement frequency of the control board 21 is adjusted according to the operating requirements of the pulse jet device, thereby adjusting the jet frequency.

[0042] In some embodiments, a crankshaft is disposed at an end of the lead screw to be suitable for connection with a driving component.

[0043] According to some embodiments of the present application, the main body 10 includes: a fitting 15, and the fitting 15 is suitable for connecting with the sleeve 222. In this embodiment, the main body 10 is provided with the fitting 15 to realize the installation of the control member 20 on the main body 10. In some embodiments, as Figure 2 As shown, the fitting 15 can be constructed as a linear bearing, and the linear bearing is slidably connected with the sleeve 222 so that the sleeve 222 can move relative to the main body 10 to drive the control board 21 to move. In some embodiments, the main body 10 is further provided with a limiter, which is suitable for limiting the movement of the screw rod 221 along the extension direction of the main body 10, so that only relative rotation occurs between the screw rod 221 and the main body 10, so as to ensure that the sleeve 222 can make a linear motion relative to the linear bearing.

[0044] According to some embodiments of the present application, the main body 10 includes: a sealing member 14, and the sealing member 14 is suitable for sealing the cavity 11. It should be noted that, in some embodiments, in order to facilitate the control panel 21 to extend into the main body 10 or for the needs of structural processing and assembly, the main body 10 is provided with an opening. Figure 2 As shown, the opening can be sealed by the sealing member 14 , thereby ensuring that a high-pressure water environment can be formed in the 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. Figure 2 As shown, in this embodiment, the main body 10 can be installed in an aqueduct or channel by providing the ear plate 16 and the mounting hole 17. The installation method is flexible and convenient for later maintenance. In some embodiments, the main body 10 is made of stainless steel by welding.

[0046] like Figure 5As shown, when the pulse jet device is used, multiple pulse jet devices can be deployed at the same time to form a larger range of turbulence effect in the water body, thereby achieving efficient killing of the larvae of the marsh clam; at the same time, the diffusion and aggregation of the larvae of the marsh clam can be effectively avoided, and the killing efficiency can be significantly improved.

[0047] The pulse jet device of the present application is mainly used in waters where clams are seriously attached. By killing the larvae of clams and cleaning the attached clams, the diffusion and aggregation of the larvae of clams can be effectively avoided, and the larvae of clams can be effectively killed. The pulse jet device of the present application is particularly suitable for waters with low flow rates, and can generate strong turbulence and high shear force, with significant killing effect.

[0048] When the pulse jet device of the present application is used, the pulse jet device is arranged in an aqueduct or channel in the target water area, and can be specifically set at the bottom or side wall of the aqueduct to ensure that the pulse water flow covers the area where larvae may attach; by adjusting the size of the jet hole and the water pump power and motor frequency, it can generate appropriate pulsating jet intensity and jet frequency.

[0049] The present application also proposes a method for killing clam larvae in water bodies, using the above-mentioned pulse jet device, including the following steps: obtaining environmental parameters of the target area; determining the 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 water flow information, water quality parameters and parameters of the larvae of the marsh clam, and the steps of obtaining the environmental parameters of the target water area specifically include: 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 larvae of the marsh clam, and to count parameters such as larval density, live density, and mortality rate; using sensing equipment to monitor the flow field, flow velocity, and turbulence characteristics of the target water body and other water flow information. According to the above environmental parameters, combined with the water body conditions and the distribution of the larvae of the marsh clam, the jet hole size, jet frequency, and jet flow rate of the pulse jet device are adjusted, and the pulse jet device is operated. In addition, the geometric parameters of the pulse jet device, including the spacing of the jet holes, etc., can also be reasonably designed according to the environmental parameters.

[0051] In order to improve the killing effect of the pulse jet device, it is necessary to determine the optimal operating parameters of the pulse jet device to produce the best turbulent effect, to ensure that sufficient turbulent effect can be generated to destroy the larval structure, and to ensure that the turbulent flow can cover the effective target area. Therefore, according to some embodiments of the present application, the method for killing larvae of marsh clams in water bodies also includes: 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 larvae of the marsh clam in the water body includes the verification of the killing effect of the pulse jet on the larvae of the marsh clam and the debugging of the device. Figure 6 As shown in the figure, during the operation of the pulse jet device, it is necessary to set up test points within the turbulent range of the test water body to monitor the changes in the survival rate of the larvae of the marsh clam at the test points, so as to evaluate the killing effect of the larvae of the marsh clam. During the verification process, indicators such as the Kappa coefficient and the F1 value can be used to evaluate the accuracy of the killing effect, among which the Kappa coefficient and the F1 value are performance measurement indicators for classification. Figure 7 As shown, if the killing effect is not good, the duration and related parameters of the pulse jet device, including the size of the jet hole, jet frequency and flow rate, etc., will continue to be adjusted based on the environmental parameters and monitoring results; if the killing effect is good, the pulse jet device can continue to be operated to achieve large-scale and effective killing of the larvae of the marsh clam.

[0053] In some embodiments, test points may also be set both upstream and downstream of the test water body to analyze the killing effect of the larvae of the marsh clam through comparison.

[0054] In addition, in order to further improve the performance of the pulse jet device, the method for killing the larvae of the marsh clam in the water body also includes monitoring and analyzing the turbulent performance of the pulse jet device and debugging the device. Specifically, during the operation of the pulse jet device, an ADV (acoustic Doppler velocimeter) is used to measure the time series of water flow velocity at different spatial positions of the water body, and the turbulence 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 influence of the probe on the water flow disturbance 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 mobile bracket, which is equipped with a guide rail with a bearing slider. The ADV body can be fixed to a depth gauge (with an accuracy of 0.1 mm) and can move vertically along the depth gauge. The depth gauge is fixed on the slider, so that the ADV can move laterally along the bracket guide rail (equipped with a horizontal ruler with an accuracy of 1 mm). Through combined movement, the position of the ADV probe can be accurately determined.

[0056] In some embodiments, the ADV data needs to be preprocessed, data with SNR < 20 and COR < 70 are removed, the sampling phase space threshold method is used to remove burr data, and the data is subjected to noise reduction. Based on the ADV preprocessed data, the time-averaged velocity field and the corresponding turbulence parameters (Reynolds stress, turbulence intensity, turbulence total energy TKE, turbulence 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 above turbulence analysis results, the jet parameters of the pulse jet device can be further optimized.

[0057] Furthermore, the above monitoring process conducts multiple test operations to compare and analyze the effective operating water range under different operating parameters; compare and analyze the differences in turbulence performance under the influence of different layout methods, focusing on analyzing key parameters such as the proportion of high-frequency pulsation, the contribution rate of three-way turbulence intensity, and the characteristic scale of turbulence structure; compare and analyze the differences in turbulence performance under the influence of different flow rates, focusing on analyzing key parameters such as the proportion of high-frequency pulsation, the contribution rate of three-way turbulence intensity, and the characteristic scale of turbulence structure. The optimal layout parameters of the pulse jet device are determined through comparative analysis to improve the performance of the pulse jet device.

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

[0059] Based on the above-mentioned pulse jet device and the method for killing larvae of marsh clams in water, the present application proposes a system for killing larvae of marsh clams, which comprises:

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

[0061] The pulse jet device sprays in the target range to generate shear force and turbulence effects to kill the larvae of the marsh clam;

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

[0063] By linking with the monitoring system and the turbulence control system, the device can realize the real-time monitoring and immediate processing of the marsh clam larvae in the water body; and can improve the degree of automation of the killing of the marsh clam larvae, reduce maintenance requirements, reduce manual intervention, and improve adaptability to complex environments, and is suitable for the control of marsh clams in large-scale waters.

[0064] The test was carried out according to the above-mentioned pulse jet device and method, and the test conditions were as follows:

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

[0066] After monitoring and calculation, the pulse jet device can achieve 100% killing of the larvae of the clam within the target range. The damage of the clam larvae under the action of the pulse jet device is shown in the following figure. Figure 8 shown.

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

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

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

[0071] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0072] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pulse jet device for killing larvae of limulus 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 are communicated with the cavity, wherein the water inlet is suitable for introducing high-pressure water flow into the cavity; A control member, wherein the control member is movably arranged on the main body and a portion of the control member extends into the cavity, and the control member is formed with a water blocking portion and a second water spray hole, wherein the water blocking portion closes the first water spray hole when facing the first water spray hole, and the second water spray hole performs a jet when facing at least a portion of the first water spray hole to be suitable for killing 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 comprises: a control plate, wherein the water blocking portion and the second water spray hole are formed on the control plate; A driving member is arranged 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 drive the control board to move relative to the main body.

3. The pulse jet device for killing larvae of the marsh clam in water according to claim 2, characterized in that: A first limiting groove and a second limiting groove are formed in the cavity, the first limiting groove and the second limiting groove have openings facing each other, and one side of the first limiting groove and the second limiting groove are flush with the side wall of the main body; The control plate is movably disposed between the first limiting groove and the second limiting groove, and a side of the control plate facing the first water spray hole is in close contact with a 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 configured as 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 configured as 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 larvae of the marsh clam in water according to claim 2, characterized in that: The driving member comprises: A screw rod, the outer circumference of which is formed with an external thread, and the screw rod is suitable for connecting with a driving component; A sleeve is formed with an internal thread matched with 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 limulus clams in water, characterized in that: The pulse jet device according to any one of claims 1 to 6 is characterized in that it comprises 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 aquatic clams 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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