Water sample collection device

Abstract

The embodiment of the present application discloses a water sample collection device, which relates to the field of water quality monitoring equipment and can solve the problem of sampling errors caused by unclear or inconvenient sampling rope markings during water quality sampling. The water sample collection device includes: a water sampling body, a traction mechanism, a water depth detector and a controller, wherein the water sampling body is used to collect water samples; the traction mechanism is provided on the water sampling body and is used to connect the traction rope; the water depth detector is provided on the water sampling body and is used to detect water depth parameters; the controller is electrically connected to the traction mechanism and the water depth detector respectively, and the controller is used to control the traction mechanism to pull or release the traction rope when the water depth parameter detected by the water depth detector is a preset water depth parameter. The water sample collection device of the present application is used for collecting water samples in water quality monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality monitoring equipment, and in particular to a water sample collecting device. Background Art

[0002] The quality of water in rivers, lakes, reservoirs, canals and other water bodies and water sources is directly related to the development of the national economy and the health of the people. Water quality analysis is one of the main contents of environmental protection testing work, especially for water bodies and water sources affected by sewage discharge. The detection and analysis of water quality is even more important. Water environment monitoring is to use physical, chemical and biological technical means to conduct qualitative, quantitative and systematic comprehensive analysis of pollutants and their related components in the water environment, so as to explore and study the changing laws of water environment quality.

[0003] Currently, water sampling requires sampling at different depths. Existing water samplers, which collect water samples at a specific depth below the water surface, typically use a sampling rope tied to the sampler. The sampler is lowered to a specific depth underwater. The water depth is determined by marking a certain length on the sampling rope, and the depth is determined by the position of the mark reaching the water surface. During sampling, staff must observe the sampling rope and then release the rope when it reaches the marked position. However, when the sampler is far from the water surface, visually determining the position of the mark on the sampling rope is often difficult, resulting in errors. Furthermore, when the water flow is strong, the water sample collected may not be the actual water sample in situ, resulting in large errors. Summary of the Invention

[0004] In view of this, an embodiment of the present application provides a water sample collection device that can solve the problem of sampling errors caused by unclear or inconvenient sampling rope markings during water quality sampling.

[0005] To achieve the above-mentioned purpose, an embodiment of the present application provides a water sample collection device, including a water sampling body, a traction mechanism, a water depth detector and a controller, wherein the water sampling body is used to collect water samples; the traction mechanism is arranged on the water sampling body and is used to connect the traction rope; the water depth detector is arranged on the water sampling body and is used to detect water depth parameters; the controller is electrically connected to the traction mechanism and the water depth detector respectively, and the controller is used to control the traction mechanism to pull or release the traction rope when the water depth parameter detected by the water depth detector is a preset water depth parameter.

[0006] The present application provides a water sample collection device. Specifically, before using the water sample collection device to collect water samples, the water depth parameters to be detected are preset to a water depth detector; the water sample collection device is then lowered into the test water area. When the device sinks to the preset water depth, the water depth detector sends a signal to a controller electrically connected to it; finally, after the controller receives the signal sent by the water depth detector, the controller sends a signal to a traction mechanism, which controls the traction mechanism to pull or release the traction rope in response, thereby reminding the sampler to reel in the traction rope for sampling. In this way, during the entire sampling process, when the sampling device reaches the preset water depth, the traction rope responds to remind the sampler to reel in the sampling rope, avoiding the situation where the water depth is unknown during sampling. Moreover, this reminder signal is real-time and highly accurate. Compared with the prior art in which the sampler observes the sampling rope and then stops releasing the sampling rope when it reaches the marked position for sampling, the sampling error is reduced.

[0007] In one possible implementation of this application, the traction mechanism includes a drive member and a rotating wheel, which are connected in a transmission manner. The drive member is mounted on the water sampling body, and the rotating wheel is used to pull or release the traction rope. With this design, when a controller sends a signal to the traction mechanism, the drive member in the traction mechanism drives the rotating wheel, which drives the traction rope back and forth, alerting the operator when the sampling device reaches the preset water depth. This is simple and easy to implement.

[0008] It should be noted that a rotating rod can also be provided on one side of the outer wall of the rotating wheel, in which case one end of the traction rope is wound around the rotating rod. When the controller controls the driving member to work, it drives the rotating wheel and the rotating rod to rotate, driving the sampling rope on the rotating rod to reciprocate, thereby reminding the staff.

[0009] In a possible implementation of the present application, the traction mechanism is provided on the top of the water collection body. This design can increase the stability of the water collection body during the sinking and lifting process.

[0010] In one possible implementation of the present application, the water depth detector is disposed at the bottom of the water sampling body. Since the water sample is taken by the water sampling body, the water sample enters through the water inlet at the bottom of the water sampling body, the design of disposing the water depth detector at the bottom of the water sampling body can further reduce sampling errors.

[0011] In one possible implementation of the present application, the controller is disposed on the outer wall of the water collection body. Here, the controller can be fixedly connected to the outer wall of the water collection body, so that the controller and the water collection body are integrated, making the device simpler and more compact.

[0012] In one possible implementation of the present application, the bottom of the water collection body comprises a bottom plate, and a buffer member connects the bottom plate to the bottom of the water collection body. The buffer member can thus buffer the pressure between the bottom of the water collection body and the bottom plate, thereby preventing damage caused by collision between the water collection body and the bottom plate.

[0013] In a possible implementation of the present application, the buffer is a spring. Here, the buffer can also be a hydraulic buffer, a polyurethane buffer, etc. In comparison, a spring has low cost and high reliability.

[0014] In a possible implementation of the present application, there are at least two springs, which are evenly arranged between the bottom plate and the bottom of the water collection body. This design can achieve better buffering effect and greater stability.

[0015] In one possible implementation of the present application, the water sampling body includes a barrel-shaped outer shell, the bottom of which is provided with a water inlet; the top of the barrel-shaped outer shell is open and provided with a fixed frame spanning the entire opening, with multiple cover plates hingedly connected to the fixed frame. When the multiple cover plates rotate around the fixed frame, the multiple cover plates are limited by the edges of the fixed frame on both sides, so that a limiting gap is formed between the multiple cover plates; the multiple cover plates are provided with magnetic elements, and the magnetic elements attract each other. With this design, when the multiple cover plates are attracted by the magnetic elements, the top of the barrel-shaped outer shell becomes open; when the water sampling body is raised, due to the limited gap formed between the multiple cover plates, the multiple cover plates can rotate under the action of water pressure, so that the top opening of the barrel-shaped outer shell is closed. This process completely avoids the situation where the cover plates cannot be opened during sampling, thereby improving the stability of the water sample collection device.

[0016] In one possible implementation of the present application, a fixed rod is provided on the inner wall of one side of the water inlet, a limiting rod is provided on the fixed rod, a limiting plate is provided on the top of the limiting rod, and a movable bottom plate is provided on the circumferential outer wall of the limiting rod. The movable bottom plate is located above the water inlet, and the size of the movable bottom plate is larger than the size of the water inlet. In this way, when sampling, the water sample passes through the water inlet and pushes the movable bottom plate to the bottom outer wall of the limiting plate, creating a gap between the movable bottom plate and the bottom of the barrel-shaped shell. The water sample enters the barrel-shaped shell, and the traction rope is pulled, so that the river water in the barrel-shaped shell squeezes the movable bottom plate, causing the movable bottom plate to block the water inlet, thereby storing and collecting the water sample. The entire design is simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the main structure of a water sample collection device provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the internal structure of a water sample collection device provided in an embodiment of the present application;

[0019] Figure 3A schematic cross-sectional view of a water sample collection device provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of the bottom plate structure of a water sampling body of a water sample collection device provided in an embodiment of the present application.

[0021] Reference numerals:

[0022] 1- water collection body; 11- barrel-shaped shell; 111- water inlet; 112- fixing rod; 1121- limiting plate; 1222- limiting rod; 113- movable bottom plate; 1131- rubber pad; 12- handle; 13- counterweight; 14- water outlet pipe; 15- fixing frame; 151- cover plate; 1511- magnetic element; 16- bottom plate; 161- circular filter plate; 17- scale line; 18- thermometer; 2- traction mechanism; 21- driving part; 22- rotating wheel; 3- water depth detector; 4- controller; 5- buffer. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the specific technical solutions of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not intended to limit the scope of the present application.

[0024] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, "multiple" means two or more.

[0025] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to changes in the orientation of the components in the drawings.

[0026] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0027] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0028] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0029] The present invention provides a water sample collection device. Figure 1 、 Figure 3 and Figure 4 The water sampling device 1 includes a water sampling body 1, which is used to collect water samples. The water sampling body 1 includes a barrel-shaped outer shell 11, a handle 12, a counterweight 13, and a water outlet pipe 14. The bottom outer wall of the barrel-shaped outer shell 11 is fixedly connected to the counterweight 13. The provision of the counterweight 13 can improve the sedimentation speed and stability of the water sampling body 1 during the sedimentation process. An integral scale line 17 is provided on one side outer wall of the barrel-shaped outer shell 11 to detect the height of the water sample in the barrel-shaped outer shell 11. A thermometer 18 is provided on one side inner wall of the barrel-shaped outer shell 11 to detect the temperature of the water sample in the barrel-shaped outer shell 11. The outer wall of one side of the barrel-shaped outer shell 11 is movably connected to the handle 12 via a rotating shaft, which can facilitate the operation of the sedimentation and lifting of the water sampling body 1. The outer wall of one side of the barrel-shaped outer shell 11 is fixedly connected to the water outlet pipe 14. A control valve is fixedly connected to one side outer wall of the water outlet pipe 14. The water sample for sampling and testing can be discharged from the water outlet pipe 14 under the control of the control valve. By using the water sampling body 1 to perform water quality sampling, the water quality can be tested and analyzed to facilitate preventive measures and treatment. When the water sampling body 1 reaches the preset water depth required for testing, it is necessary to remind the sampling personnel to control the retraction and release of the traction rope to perform sampling. In the prior art, the traction rope is often marked, and the sampling personnel need to observe the traction rope before stopping and releasing the traction rope to perform sampling. Since the marking is not obvious or inconvenient to observe, the sampling will have a large error, which will affect the accuracy of the water quality test results. Therefore, there is an urgent need for a water sampling device that can achieve the accuracy of the sampling process.

[0030] Therefore, the embodiment of the present application provides a water sample collection device, referring to Figure 1、 Figure 3 and Figure 4 , including a water sampling body 1, a traction mechanism 2, a water depth detector 3 and a controller 4, wherein the water sampling body 1 is used to collect water samples; the traction mechanism 2 is arranged on the water sampling body 1 and is used to connect the traction rope; the water depth detector 3 is arranged on the water sampling body 1 and is used to detect water depth parameters; the controller 4 is electrically connected to the traction mechanism 2 and the water depth detector 3 respectively, and the controller 4 is used to control the traction mechanism 2 to pull or release the traction rope when the water depth parameter detected by the water depth detector 3 is a preset water depth parameter.

[0031] The present application provides a water sample collection device, specifically, referring to Figure 1 、 Figure 3 and Figure 4 Before using the water sampling device to collect water samples, the water depth parameters to be tested are preset for the water depth detector 3; then the water sampling device is sunk into the test water area. When the device sinks to the preset water depth, the water depth detector 3 sends a signal to the controller 4 electrically connected to it; finally, after the controller 4 receives the signal sent by the water depth detector 3, the controller 4 sends a signal to the traction mechanism 2, which controls the traction mechanism 2 to pull or release the traction rope in response, thereby reminding the sampler to reel in the traction rope for sampling. In this way, during the entire sampling process, when the sampling device reaches the preset water depth, the traction rope is used to respond to remind the sampler to reel in the traction rope, thus avoiding the situation where the water depth is unknown during sampling. Moreover, this reminder signal is real-time and highly accurate. Compared with the prior art in which the sampler observes the traction rope and then stops releasing the traction rope when it reaches the marked position for sampling, the sampling error is reduced.

[0032] Here, the type of the water depth detector 3 is not limited, and it can be, for example, an ultrasonic water depth detector, a pressure sensing water depth detector, or the like.

[0033] It should be noted that the controller 4 can also be wirelessly connected to the traction mechanism 2 and the water depth detector 3. For example, the water depth detector 3 is provided with a signal transmitter, and the controller 4 is provided with a signal receiver that matches the signal transmitter; similarly, the controller 4 is provided with a signal transmitter, and the traction mechanism 2 is provided with a signal receiver that matches the signal transmitter on the controller 4. In this case, the signal transmission can be transmitted via short-range communication technology, such as Bluetooth, etc., which is not limited to this invention.

[0034] In some embodiments, reference Figure 1 、 Figure 3 and Figure 4The traction mechanism 2 also includes a drive member 21 and a rotating wheel 22, which are connected in a transmission manner. The drive member 21 is mounted on the water sampling body, and the rotating wheel 22 is used to pull or release the traction rope. With this design, when the controller 4 sends a signal to the traction mechanism 2, the drive member 21 in the traction mechanism 2 responds and, through its transmission connection, drives the traction rope back and forth, thereby alerting personnel that the sampling device has reached the preset water depth. This is simple and easy to operate.

[0035] Here, the transmission connection method between the driving member 21 and the rotating wheel 22 is not limited, as long as the rotational torque of the rotating wheel 22 can be transmitted. For example, the output shaft of the driving member 21 and the rotating wheel 22 are fixedly connected by a transmission shaft. The connection can be direct, such as welding, fastener connection, etc., or indirect, such as connection via a coupling.

[0036] It should be noted that the traction mechanism 2 is provided with a signal receiver that matches the signal transmitter on the controller 4, and after receiving the signal sent by the controller 4, it can control the driving member 21 in the traction mechanism 2 to respond.

[0037] It should be further noted that a rotating rod may also be provided on one side of the outer wall of the rotating wheel 22. In this case, one end of the traction rope is wound around the rotating rod. When the controller 4 controls the driving member 21 to operate, it drives the rotating wheel 22 and the rotating rod to rotate, thereby driving the traction rope on the rotating rod to reciprocate, thereby reminding the staff.

[0038] In some embodiments, reference Figure 1 The traction mechanism 2 is arranged on the top of the water collection body 1. This design can increase the stability of the water collection body 1 during the sinking and lifting process.

[0039] It should be noted that a handle portion 12 is provided on the water sampling body 1, and a protective shell is fixed to the outer wall of one side by bolts. The driving member 21 and the signal receiver in the traction mechanism 2 are fixed inside the protective shell. In this way, the driving member 21 and the signal receiver in the traction mechanism 2 can be prevented from being immersed in water and causing malfunctions.

[0040] In some embodiments, reference Figure 3 and Figure 4 The water depth detector 3 is arranged at the bottom of the water sampling body 1. With this design, since the water sampling body 1 takes water samples, the water samples enter through the water inlet 111 at the bottom of the water sampling body 1, the design of the water depth detector 3 being arranged at the bottom of the water sampling body 1 can further reduce sampling errors.

[0041] In one embodiment, referring to Figure 1 、 Figure 3 and Figure 4The bottom of the water collection body 1 has a bottom plate 16, and the bottom plate 16 and the bottom of the water collection body 1 are connected by a buffer 5. In this way, the buffer 5 can buffer the pressure between the bottom of the water collection body 1 and the bottom plate 16, thereby preventing the water collection body 1 from colliding with the bottom plate 16 and causing damage.

[0042] Reference Figure 1 、 Figure 2 and Figure 4 Here, the buffer member 5 can also be a hydraulic buffer member, a polyurethane buffer, etc. In comparison, the spring has low cost and high reliability. Therefore, the spring is selected as the buffer member 5 in this embodiment.

[0043] Continue, Figure 1 、 Figure 2 and Figure 4 There are at least two springs, which are evenly arranged between the bottom plate 16 and the bottom of the water collection body 1. Such a design can make the buffering effect better and the stability stronger.

[0044] In some embodiments, reference Figure 1 , Figure 3 and Figure 4 The water collection body 1 includes a barrel-shaped shell 11, and a water inlet hole 111 is provided at the bottom of the barrel-shaped shell 11; the top of the barrel-shaped shell 11 is open and is provided with a fixing frame 15 spanning the entire opening, and multiple cover plates 151 are hinged to the fixing frame 15. When the multiple cover plates 151 rotate around the fixing frame 15, the multiple cover plates 151 are limited by the edges on both sides of the fixing frame 15, so that a limiting gap is formed between the multiple cover plates 151; magnetic elements 1511 are provided on the multiple cover plates 151, and the magnetic elements 1511 are attracted to each other.

[0045] Specifically, the mounting bracket 15 is fixed to the inner wall of the top opening of the barrel-shaped housing 11, passing through the center of the top opening of the barrel-shaped housing 11 and spanning the entire top opening of the barrel-shaped housing 11. Multiple cover plates 151 are hinged to the two side edges of the mounting bracket 15, with limited gaps formed between the cover plates 151. Specifically, the cover plates 151 at the two side edges of the mounting bracket 15 only partially touch, not fully fit. Thus, when the cover plates 151 are attracted by the magnetic elements 1511, gaps are formed between the cover plates 151. This design allows the top of the barrel-shaped housing 11 to be open when the cover plates 151 are attracted by the magnetic elements 1511. When the water sampling body 1 is lifted out of the water, the limited gaps between the cover plates 151 allow the cover plates 151 to rotate under the action of water pressure, sealing the top opening of the barrel-shaped housing 11. This process completely prevents the cover plates 151 from being unable to open during sampling, thereby increasing the stability of the device.

[0046] It should be noted that the fixing connection method between the tub-shaped housing 11 and the fixing frame 15 is not limited here. For example, it can be welding, bolt connection, etc.

[0047] It should be further explained that the number of the cover plates 151 is at least two, and the specific number is not limited, and the shape of the cover plates 151 is also not limited. For example, in some embodiments, referring to Figure 1 、 Figure 2 and Figure 3 There are two cover plates 151, both of which are semicircular in shape, and the two semicircular cover plates 151 form a circle, which is hinged to the two side edges of the fixing frame 15 by hinges. The two semicircular cover plates 151 are adapted to the water outlet, that is, when the two semicircular cover plates 151 are used, the top opening of the barrel-shaped shell 11 can be closed.

[0048] In some embodiments, reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 A fixing rod 112 is provided on the inner wall of one side of the water inlet hole 111. A limiting rod 1122 is provided on the fixing rod 112. A limiting plate 1121 is provided on the top of the limiting rod 1122. A movable bottom plate 113 is provided on the circumferential outer wall of the limiting rod 1122. The movable bottom plate 113 is located above the water inlet hole 111 and is larger than the size of the water inlet hole 111. In this way, the movable bottom plate 113 can be limited and the water inlet hole 111 can be blocked. Specifically, during sampling, the water sample flushes the movable bottom plate 113 to the bottom outer wall of the limiting plate 1121 through the water inlet hole 111, creating a gap between the movable bottom plate 113 and the bottom of the barrel-shaped outer shell 11, and enters the barrel-shaped outer shell 11. The traction rope is pulled, so that the river water in the barrel-shaped outer shell 11 squeezes the movable bottom plate 113, causing the movable bottom plate 113 to block the water inlet hole 111, thereby realizing the storage and collection of water samples. The entire design is simple and easy to use.

[0049] Here, refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, a rubber pad 1131 is bonded to the bottom outer wall of movable bottom plate 113. Rubber pad 1131 is larger than water inlet 111. When the traction rope is pulled, the water sample within tubular housing 11 presses against movable bottom plate 113, securing movable bottom plate 113 to the bottom outer wall of tubular housing 11 via rubber pad 1131, thereby storing the water sample. Compared to designs without rubber pad 1131 bonded to movable bottom plate 113, the presence of rubber pad 1131 enhances the sealing of the water inlet, preventing water leakage.

[0050] In addition, refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, a mounting groove is provided on the outer wall of one side of the bottom plate 16. The diameter of the mounting groove is larger than the diameter of the water inlet hole 111 and is located directly below the water inlet hole 111. A circular filter plate 161 is fixed to the inner wall of one side of the mounting groove. By setting the circular filter plate 161, larger debris and garbage in the water area can be intercepted to avoid a large amount of impurities in the water sample taken, which affects the detection effect.

[0051] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A water sample collection device, characterized in that: include: Water sampling body, used for collecting water samples; A traction mechanism, provided on the water sampling body, for connecting a traction rope; A water depth detector is provided on the water sampling body and is used to detect water depth parameters; The traction mechanism includes a driving member and a rotating wheel, wherein the driving member and the rotating wheel are in transmission connection, the driving member is arranged on the water collection body, and the rotating wheel is used for pulling or releasing the traction rope; a controller electrically connected to the traction mechanism and the water depth detector, the controller being configured to control the traction mechanism to pull or release the traction rope when the water depth parameter detected by the water depth detector is a preset water depth parameter, so as to drive the traction rope to reciprocate, thereby reminding the sampling personnel to reel in the traction rope for sampling; The water collection body includes a barrel-shaped shell: The bottom of the barrel-shaped shell is provided with a water inlet hole; The top of the barrel-shaped shell is open and is provided with a fixing frame spanning the entire opening. A plurality of cover plates are hingedly connected to the fixing frame. When the plurality of cover plates rotate around the fixing frame, the plurality of cover plates are limited by the edges of the fixing frame on both sides, so that a limiting gap is formed between the plurality of cover plates. The plurality of cover plates are provided with magnetic elements, and the magnetic elements are attracted to each other, so that the top of the barrel-shaped shell is open. When the water collection body is lifted out of the water area, the multiple cover plates rotate under the action of water pressure, so that the top opening of the barrel-shaped shell is closed.

2. The water sample collection device according to claim 1, characterized in that: The traction mechanism is arranged on the top of the water sampling body.

3. The water sample collection device according to claim 1, characterized in that: The water depth detector is arranged at the bottom of the water sampling body.

4. The water sample collection device according to claim 1, characterized in that: The controller is arranged on the outer wall of the water sampling body.

5. The water sample collection device according to claim 1, characterized in that: The bottom of the water collection body is provided with a bottom plate, and the bottom plate and the bottom of the water collection body are connected via a buffer member.

6. The water sample collection device according to claim 5, characterized in that: The buffer component is a spring.

7. The water sample collection device according to claim 6, characterized in that: There are at least two springs, which are evenly arranged between the bottom plate and the bottom of the water collection body.

8. The water sample collection device according to claim 1, characterized in that: A fixing rod is provided on the inner wall of one side of the water inlet hole, a limiting rod is provided on the fixing rod, a limiting plate is provided on the top of the limiting rod, and a movable bottom plate is provided on the circumferential outer wall of the limiting rod. The movable bottom plate is located above the water inlet hole, and the size of the movable bottom plate is larger than the size of the water inlet hole.

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