A sluice section water intake device for water conservancy projects

Abstract

The application relates to the technical field of water conservancy projects, and particularly discloses a water gate segmented water taking device for water conservancy projects, which is installed on a water channel and comprises a gate plate for blocking water in the water channel, a plurality of water passing openings arranged on the gate plate and located at different water level heights, and an opening and closing mechanism arranged in the gate plate and used for opening and closing the different water passing openings. A positioning mechanism is further arranged in the gate plate, and water quality detection mechanisms and illumination intensity detection mechanisms for detecting water quality of different water levels and detecting illumination intensity are arranged on the gate plate. When the water quality detection mechanisms detect that the water quality of the water passing openings is within a preset range and the illumination intensity detection mechanisms detect that the illumination intensity is within a preset range, the opening and closing mechanism opens the corresponding water passing openings, different water conveying pipes can be connected to the different water passing openings, different crops can be irrigated at suitable irrigation time and suitable water quality, and the positive effect of irrigation on different crops is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water conservancy projects, and in particular to a sluice segmented water intake device for water conservancy projects. Background Art

[0002] Water conservancy projects refer to various projects built to control, regulate, and utilize natural surface water and groundwater to eliminate harm and promote benefits. They mainly include flood control projects, farmland water conservancy projects, hydropower generation projects, port projects, urban water supply and drainage projects, soil and water conservation projects, and environmental water conservancy projects.

[0003] Agricultural water conservancy projects are mainly aimed at improving the water supply problem of crops. Agricultural water conservancy projects usually adopt the method of building canals to divert water, and then divert the water from the canals to the vicinity of the farmland, and transport the water to different farmlands through water pipes or manual transfer, so as to realize the irrigation of different crops.

[0004] However, the above irrigation methods have the following problems: First, different crops have different requirements for water quality. If the water quality is poor, it will have a negative impact on the growth of crops during the irrigation process; Second, different crops prefer different shade and sunshine. Under different light intensities throughout the day, the optimal irrigation time for different crops is also different. Irrigating different crops during the same period will also affect the normal growth of crops.

[0005] Based on the above two points, there are defects in directly using canals to irrigate crops, so improvements are needed. Summary of the Invention

[0006] In order to meet the different water quality and light requirements of different crops and improve the positive effects of irrigation on crops, the present application provides a sluice segmented water intake device for water conservancy projects.

[0007] This application provides a sluice section water intake device for water conservancy projects, which adopts the following technical solution:

[0008] A sluice-type water intake device for a water conservancy project, installed on a canal, comprising a gate plate for blocking water in the canal, a plurality of water inlets provided on the gate plate and located at different water levels, and an opening and closing mechanism provided in the gate plate for opening and closing the different water inlets;

[0009] The gate plate is also provided with a positioning mechanism for positioning the position of each water outlet, and the opening and closing mechanism can accurately adjust the opening and closing of each water outlet under the positioning action of the positioning mechanism;

[0010] The gate plate is respectively provided with a water quality detection mechanism and a light intensity detection mechanism for detecting the water quality at different water levels and the light intensity. When the water quality detection mechanism detects that the water quality of the water outlet is within a preset range, and the light intensity detection mechanism detects that the light intensity is within a preset range, the opening and closing mechanism opens the corresponding water outlet.

[0011] By adopting the above technical solution, since different crops have different requirements for water quality and light intensity, the positive effects of irrigating different crops under different light intensities and water quality conditions are different. The segmented water intake device in this application can selectively irrigate according to the most suitable water quality and light intensity for different crops, and only irrigate the corresponding crops when the corresponding conditions are met;

[0012] Specifically, when the water quality detection mechanism detects that the water quality of the water outlet is within a preset range, and the light intensity detection mechanism detects that the light intensity is within a preset range, when both conditions are met at the same time, the opening and closing mechanism will open the corresponding water outlet under the positioning action of the positioning mechanism. Different water pipes can be connected to different water outlets. When the water quality at a certain water outlet meets the requirements and the external light intensity meets the requirements, the water at the corresponding water outlet is transported to the corresponding crops.

[0013] The water quality and light intensity ranges suitable for different plants in this application are different and do not overlap. When irrigation at a certain water outlet is completed or the irrigation conditions are not met, the opening and closing mechanism will detect the water quality at the next water outlet, and the light intensity detection mechanism will detect the light intensity at this time, so as to determine whether the water at the corresponding water outlet is suitable for delivery to the corresponding crops for irrigation;

[0014] The present application aims to solve the problem of irrigating different crops separately at different suitable watering times and with different suitable water qualities, so as to improve the positive watering effect on different crops, improve the watering quality, and make different crops grow better.

[0015] Optionally, the opening and closing mechanism includes a disc gate arranged in the gate plate and a power assembly for driving the disc gate to rotate. A receiving groove for accommodating and rotating the disc gate is provided in the gate plate, and an opening and closing port is provided on the disc gate that can be rotatably connected to any of the water outlets.

[0016] By adopting the above technical scheme, when the water quality detection mechanism and the light intensity detection mechanism detect that all the data meet the conditions, the power component drives the gear to rotate, the rotating gear drives the disc gate to rotate, and the opening and closing openings on the disc gate are communicated with the corresponding water passing openings, so that the corresponding crops are irrigated under suitable conditions.

[0017] Optionally, a ring-shaped rack is arranged on the outer circumferential wall of the disc gate in the circumferential direction, the power component comprises a gear rotatably installed in the gate plate and engaged with the rack, and a power member is arranged to drive the gear to rotate.

[0018] By adopting the above technical scheme, when the water quality detection mechanism and the light intensity detection mechanism detect that all the data meet the conditions, the power component drives the gear to rotate, the rotating gear drives the disc gate to rotate, and the opening and closing openings on the disc gate are communicated with the corresponding water passing openings, so that the corresponding crops are irrigated under suitable conditions.

[0019] Optionally, an anti-seepage structure for reducing water seepage is arranged between the disc gate and the gate plate.

[0020] By adopting the above technical scheme, in the rotating process of the disc gate, the water in the water passing opening on the water-facing surface flows from the disc surface of the disc gate to the gear, and then seeps to the power member. Since the power member is usually driven by electricity, the power member may be short-circuited. The anti-seepage structure in the application can reduce the seepage of water from the disc gate to the gear, thereby reducing the possibility of damage to the power member.

[0021] Optionally, the anti-seepage structure comprises a sealing protrusion arranged on one side of the disc gate and a mounting groove corresponding to the bottom of the accommodating groove, and the sealing protrusion surrounds the opening and closing opening.

[0022] By adopting the above technical scheme, in the rotating process of the disc gate, the sealing protrusion and the mounting groove are in sliding sealing, so that the water in the water passing opening is difficult to penetrate along the disc surface of the disc gate to the gear, thereby achieving the effect of preventing seepage.

[0023] Optionally, the positioning mechanism comprises a mounting ring sleeved on the tooth surface of the gear, a plurality of pressure sensors arranged on the circumferential wall of the mounting ring corresponding to each water passing opening, a clamping groove is arranged in the middle of the tooth surface of the rack in the circumferential direction for clamping the mounting ring, and when the gear drives the mounting ring to rotate, the sensing surface of the pressure sensor abuts against the bottom wall of the clamping groove.

[0024] A control device is arranged above the gate plate, the control device is in electrical connection with the pressure sensor, and the control device can control the start and stop of the power member according to the data transmitted by the pressure sensor.

[0025] By adopting the above technical solution, after the water quality detection mechanism and the light intensity detection mechanism detect data, they will transmit the data to the data analysis module of the control device respectively. After the data analysis, the control module in the control device controls the operation of the power component, which then drives the gear to rotate, thereby rotating the disc gate. During the rotation of the gear, it also drives the mounting ring to rotate, and the mounting ring drives the various pressure sensors to rotate.

[0026] When the opening and closing port on the disc gate rotates to connect with a water outlet, the detection surface of the pressure sensor just slightly contacts the bottom wall of the clamping groove. At this time, the pressure sensor detects a pressure signal, which is transmitted to the control device. After data analysis and judgment, the control power component stops working, thereby temporarily stopping the rotation of the disc gate. At this time, the opening and closing port is connected with the water outlet, so that the corresponding crops can be irrigated.

[0027] After the irrigation is completed, other water outlets that meet the conditions are opened in turn to achieve irrigation of other crops. It is worth noting that the various crops targeted in this application have different requirements for water quality and light intensity, so the irrigation time of each water outlet will not conflict with each other.

[0028] Optionally, the control device includes a control room arranged above the gate plate, a control console arranged in the control room, and a power supply group, and the control console is electrically connected to the pressure sensor and the power component respectively.

[0029] By adopting the above technical solution, the console can automatically receive pressure sensor signals and control the start and stop of components such as power parts, thereby meeting the needs of unmanned irrigation. Of course, the console can also be operated manually.

[0030] Optionally, the water quality detection mechanism includes a plurality of suspended matter sensors arranged on the water-facing surface of the gate along the height direction of the gate, the height of each suspended matter sensor corresponds one-to-one to the height of each water outlet, and each suspended matter sensor is electrically connected to the console.

[0031] By adopting the above technical solution, suspended matter sensors at different water level heights can separately detect the water quality at different water outlets. When each suspended matter sensor detects the water quality data, it will be transmitted to the control console. The control console will analyze and judge the irrigation conditions based on the data measured by the light intensity detection mechanism, thereby controlling the start and stop of the power parts, so that different crops can be irrigated under suitable conditions.

[0032] Optionally, the water inlet is provided with a filter screen on the water inlet surface.

[0033] By adopting the above technical scheme, the filter screen can filter the water at the water inlet, thereby filtering the impurities in the water, so as to make the water irrigated to crops more clean and improve the irrigation quality.

[0034] Optionally, the lowermost water inlet is provided with a stirring mechanism for stirring the bottom layer of silt.

[0035] By adopting the above technical scheme, since the water quality of the lowermost layer is poor and a lot of silt is accumulated, clogging is prone to occur at the water inlet during irrigation, and the stirring mechanism can stir the water flowing through the water inlet, thereby reducing the possibility of clogging.

[0036] In summary, the present application has at least one of the following beneficial technical effects:

[0037] 1. The water quality detection mechanism can detect water at different water levels, and the light intensity detection mechanism can detect external light, both of which transmit data to the control console, which analyzes and judges the signals and realizes the opening of different water inlets under the conditions of meeting the water quality requirements and light intensity requirements, and realizes the separate irrigation of different crops;

[0038] 2. The opening and closing mechanism can realize the opening of different water inlets;

[0039] 3. The positioning mechanism can make the opening and closing mechanism realize the precise opening of each water inlet. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a whole structure schematic diagram of a water gate segmented water taking device for water conservancy projects in the embodiment of the present application.

[0041] Figure 2 is Figure 1 is a partial structure schematic diagram of the opening and closing mechanism in the first perspective.

[0042] Figure 3 is Figure 1 is a partial structure schematic diagram of the opening and closing mechanism in the second perspective.

[0043] Figure 4 is Figure 1 is a whole structure schematic diagram of another perspective of a water gate segmented water taking device for water conservancy projects in the embodiment of the present application.

[0044] Figure numerals: 1, water channel; 11, gate; 12, control device; 121, solar panel; 2, water inlet; 3, opening and closing mechanism; 31, disc gate; 311, opening and closing port; 312, rack; 3121, snap-in groove; 32, power assembly; 321, gear; 322, power part; 4, water quality detection mechanism; 41, suspended matter sensor; 5, light intensity detection mechanism; 6, anti-seepage structure; 61, sealing ridge; 7, positioning mechanism; 71, mounting ring; 72, pressure sensor; 8, filter screen; 9, stirring mechanism. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-4 , further details of this application are given.

[0046] The embodiment of the present application discloses a sluice segmented water intake device for water conservancy projects.

[0047] like Figure 1 As shown, it is installed on a water channel 1 and includes a gate plate 11 for blocking water in the water channel 1 and a control device 12 installed on the water channel 1. The gate plate 11 is provided with a plurality of water inlets 2 at different heights, and the plurality of water inlets 2 are arranged at intervals on the circumference.

[0048] An opening and closing mechanism 3 for opening and closing each water outlet 2 is provided in the gate plate 11. A water quality detection mechanism 4 for detecting the water quality of water at different water levels is also provided on the water-facing surface of the gate plate 11, as well as a light intensity detection mechanism 5 provided on the control room for detecting the external light intensity.

[0049] The control device 12 includes a control room built on the canal 1, in which a control console and a power supply group are installed. A solar panel 121 for generating electricity is installed on the roof of the control room. Both the solar panel 121 and the power supply group can provide energy to the water quality detection mechanism 4, the light intensity detection mechanism 5, the opening and closing mechanism 3, etc.

[0050] In common farmland water conservancy projects currently, only a canal 1 is excavated and poured near the farmland. The water in the canal 1 includes accumulated rainwater and underground seepage water, and may also be mixed with various impurities and suspended matter. Different crops have different requirements for water quality. Some crops have higher requirements for water quality, such as paddy field crops, while some crops have lower requirements for water quality, such as dryland crops. The requirements of specific crops in paddy field crops or dryland crops are also different. This is a concept of the present invention.

[0051] In addition, different crops prefer shade and sun to different degrees, and have different requirements for light intensity. Combining the above two points, how to improve the conditions during irrigation so that different crops can be irrigated under the most suitable environment and water quality conditions is an urgent problem to be solved. Therefore, the segmented water intake device in the present invention is designed.

[0052] The specific structure and composition of the segmented water intake device are described below. Figure 1 As shown, the opening and closing mechanism 3 includes a disc gate 31 rotatably mounted in the gate plate 11 and a power assembly 32 for driving the disc gate 31 to rotate. The power assembly 32 is provided with two groups, and the two groups of power assemblies 32 are respectively located on both sides of the disc gate 31;

[0053] A receiving groove is provided in the gate plate 11 for accommodating and rotating the disc gate 31. The center of the disc gate 31 is rotatably connected to the side wall of the gate plate 11. Specifically, a bearing is provided at the center of the disc gate 31. The outer ring of the bearing is fixed to the center of the disc gate 31, and the inner ring of the bearing is fixed to the bottom wall of the receiving groove.

[0054] In order to facilitate the installation of the bearing, a placement groove can be opened at the bottom of the receiving groove, and the bearing can be installed in the placement groove, thereby reducing the space occupied by the bearing during installation and reducing the gap between the disc gate 31 and the bottom wall of the receiving groove to a certain extent;

[0055] like Figure 1 and Figure 2 As shown, the disc gate 31 is provided with an opening and closing port 311 that can be rotatably connected with any water outlet 2. When the power component 32 drives the disc gate 31 to rotate, the rotating disc gate 31 can drive the opening and closing port 311 to rotate together, so that the opening and closing port 311 can be connected with multiple water outlets 2 in sequence, thereby controlling the discharge of water at the water outlet 2.

[0056] In this embodiment, three water outlets 2 are provided. The three water outlets 2 are arranged in a circle and are located at different water levels. The three water outlets 2 correspond to three different water qualities. The three water outlets 2 are suitable for irrigating three different crops.

[0057] In other feasible implementations, the water outlets 2 may be provided in four, five or other numbers, and the specific number may be selected according to the types of crops to be irrigated.

[0058] In order to reduce water leakage during the rotation of the disc gate 31, an anti-seepage structure 6 is provided between the disc gate 31 and the gate plate 11. The anti-seepage structure 6 includes a sealing ridge 61 fixed to one side of the disc gate 31 and a corresponding mounting groove at the bottom of the receiving groove. The sealing ridge 61 is slidably and sealingly engaged in the mounting groove.

[0059] In this embodiment, the sealing ridge 61 is annular, and the annular sealing ridge 61 surrounds the opening and closing port 311, so that when the opening and closing port 311 is connected to the water outlet 2, it is difficult for water to leak into the power component 32, thereby reducing the impact on the normal operation of the power component 32.

[0060] like Figure 1 、 Figure 2 and Figure 3 As shown, an annular rack 312 is welded circumferentially on the outer wall of the disc gate 31, and the power assembly 32 includes a gear 321 rotatably mounted in the gate plate 11 and meshing with the rack 312, and a power member 322 for driving the gear 321 to rotate. The power member 322 is a servo motor, and the output shaft of the servo motor is coaxially fixedly connected to the gear 321, and the servo motor is electrically connected to the control console.

[0061] When the water quality detection mechanism 4 completes the detection of water quality and the light intensity detection mechanism 5 completes the detection of the light intensity of the external environment, the water quality and light intensity data are transmitted to the control console. After analysis and judgment, the control console will control the servo motor to operate only when the water quality range of the corresponding water outlet 2 is within the preset range and the light intensity is within the appropriate range, thereby driving the disc gate 31 to rotate, so that the opening and closing port 311 is connected with the corresponding water outlet 2, thereby realizing drainage and irrigation.

[0062] During the rotation of the disc gate 31, the position of the water outlet 2 on the gate plate 11 needs to be positioned to achieve accurate alignment of the opening and closing opening 311 with each water outlet 2. Therefore, a positioning mechanism 7 for positioning the position of each water outlet 2 is also provided in the gate plate 11. The opening and closing mechanism 3 can accurately open and close each water outlet 2 under the positioning action of the positioning mechanism 7.

[0063] like Figure 2 and Figure 3 As shown, the positioning mechanism 7 includes a mounting ring 71 fixedly mounted on the tooth surface of the gear 321, and three pressure sensors 72 arranged on the outer wall of the mounting ring 71 corresponding to the three water outlets 2. The three pressure sensors 72 are all electrically connected to the control console. A snap-fit ​​groove 3121 for the mounting ring 71 to snap into is circumferentially defined in the middle of the tooth surface of the rack 312. When the gear 321 drives the mounting ring 71 to rotate, the sensing surface of the pressure sensor 72 abuts against the bottom wall of the snap-fit ​​groove 3121.

[0064] The pressure sensor 72 transmits the detected pressure signal to the control console and converts it into data. The control console analyzes and judges the data and implements the operation control of the servo motor under the condition that the light intensity meets the requirements, thereby realizing the opening and draining of water at different water outlets 2.

[0065] like Figure 4As shown, the water quality detection mechanism 4 includes a plurality of suspended matter sensors 41 provided on the water-facing surface of the gate plate 11 along the height direction of the gate plate 11. In this embodiment, three suspended matter sensors 41 are provided corresponding to each water outlet 2. The heights of the three suspended matter sensors 41 correspond to the heights of the water outlets 2 one by one, and all three suspended matter sensors 41 are electrically connected to the control console.

[0066] like Figure 4 As shown, the light intensity detection mechanism 5 includes a light sensor installed on the top of the control room. The light intensity sensor is electrically connected to the control console. The light sensor can detect the light intensity outside the canal 1 and transmit the measured data to the control console. The control console will analyze and judge the water quality data and light intensity data respectively. Only when both are within the preset range will the corresponding water outlet 2 be opened to release water. A water pipe can be connected to the water outlet 2 to irrigate water from different water outlets 2 to different crops, thereby achieving the effect of segmented irrigation.

[0067] Furthermore, in order to make the water quality flowing out of the water outlet 2 better, Figure 4 As shown, filter screens 8 are respectively provided on the water-facing surfaces of the water outlet 2. Since there may be mud and sand and other materials in the bottom layer, the filter screen 8 is not installed on the water outlet 2 of the bottom layer; each filter screen 8 can be detachably installed on the corresponding water outlet 2, and the specific detachable structure between the filter screen 8 and the water outlet 2 includes a card slot opened on the inner peripheral wall of the water outlet 2 and a card strip arranged on the frame of the filter screen 8.

[0068] During installation, the card strip is inserted into the corresponding card slot to realize the detachable installation of the filter screen 8. A stirring mechanism 9 for stirring the bottom sediment is provided in the water outlet 2 of the lowest layer. The stirring mechanism 9 includes a motor installed on the gate plate 11, a rotating shaft fixed coaxially with the motor, and a stirring blade installed at the end of the rotating shaft. The motor is electrically connected to the control console, and the stirring blade extends into the water outlet 2 of the lowest layer, which can realize the stirring of impurities that may exist in the water outlet 2.

[0069] The implementation principle of the sluice staged water intake device for a water conservancy project in the embodiment of the present application is as follows: the water quality detection mechanism 4 and the light intensity detection mechanism 5 respectively detect the water quality coefficient and the light intensity, and transmit the data to the control console;

[0070] The control console analyzes and judges the data. When the data detected by the water quality detection mechanism 4 is within the preset range, the light intensity is judged. When both the water quality and the light intensity are within the preset range, the control console controls the servo motor to operate, and the servo motor drives the disc gate 31 to rotate, so that the opening and closing port 311 rotates to the water outlet 2 that meets the conditions, and the corresponding crops are irrigated.

[0071] If the water quality at different heights is within the preset range, that is, within the optimal suitable range for the corresponding crops, then the different crops can be irrigated in sequence according to the light intensity.

[0072] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sluice-type water intake device for a water conservancy project, installed on a canal (1), characterized in that: It comprises a gate plate (11) for blocking water in the water channel (1), a plurality of water outlets (2) provided on the gate plate (11) and located at different water levels, and an opening and closing mechanism (3) provided in the gate plate (11) for opening and closing the different water outlets (2); A positioning mechanism (7) for positioning the position of each water outlet (2) is also provided in the gate plate (11), and the opening and closing mechanism (3) can accurately adjust the opening and closing of each water outlet (2) under the positioning action of the positioning mechanism (7); The gate plate (11) is provided with a water quality detection mechanism (4) and a light intensity detection mechanism (5) for detecting water quality at different water levels and light intensity, respectively. When the water quality detection mechanism (4) detects that the water quality of the water outlet (2) is within a preset range, and the light intensity detection mechanism (5) detects that the light intensity is within a preset range, the opening and closing mechanism (3) opens the corresponding water outlet (2); The opening and closing mechanism (3) comprises a disc gate (31) arranged in the gate plate (11) and a power assembly (32) for driving the disc gate (31) to rotate; a receiving groove for accommodating and rotating the disc gate (31) is provided in the gate plate (11); and an opening and closing port (311) capable of being rotatably connected to any of the water outlets (2) is provided on the disc gate (31); An annular rack (312) is circumferentially provided on the outer peripheral wall of the disc gate (31), and the power assembly (32) includes a gear (321) rotatably mounted in the gate plate (11) and meshing with the rack (312), and a power member (322) for driving the gear (321) to rotate. The positioning mechanism (7) comprises a mounting ring (71) sleeved on the tooth surface of the gear (321), and a plurality of pressure sensors (72) arranged on the peripheral wall of the mounting ring (71) corresponding to each of the water outlets (2). A clamping groove (3121) for clamping the mounting ring (71) is provided in the middle of the tooth surface of the rack (312) along the circumferential direction. When the gear (321) drives the mounting ring (71) to rotate, the sensing surface of the pressure sensor (72) contacts the bottom wall of the clamping groove (3121). A control device (12) is provided above the gate plate (11), the control device (12) is electrically connected to the pressure sensor (72), and the control device (12) can control the start and stop of the power component (322) according to data transmitted by the pressure sensor (72).

2. A sluice-stage water intake device for a water conservancy project according to claim 1, characterized in that: An anti-seepage structure (6) for reducing water leakage is provided between the disc gate (31) and the gate plate (11).

3. The sluice-stage water intake device for water conservancy projects according to claim 2, characterized in that: The anti-seepage structure (6) includes a sealing convex strip (61) provided on one side of the disc gate (31) and a corresponding mounting groove opened at the bottom of the accommodating groove, and the sealing convex strip (61) encloses the opening and closing port (311).

4. The sluice staged water intake device for water conservancy projects according to claim 1, characterized in that: The control device (12) comprises a control room arranged above the gate plate (11), a control console arranged in the control room, and a power supply group, wherein the control console is electrically connected to the pressure sensor (72) and the power component (322) respectively.

5. The sluice-stage water intake device for water conservancy projects according to claim 4, characterized in that: The water quality detection mechanism (4) comprises a plurality of suspended matter sensors (41) arranged on the water-facing surface of the gate plate (11) along the height direction of the gate plate (11), the height of each suspended matter sensor (41) corresponding to the height of each water outlet (2), and each suspended matter sensor (41) is electrically connected to the control console.

6. The sluice staged water intake device for water conservancy projects according to claim 1, characterized in that: Filter screens (8) are respectively provided on the water-facing surfaces of the water outlets (2), and each of the filter screens (8) can be detachably mounted on the corresponding water outlets (2).

7. The sluice staged water intake device for water conservancy projects according to claim 1, characterized in that: The bottom water outlet (2) is provided with a stirring mechanism (9) for stirring the bottom sediment.

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