Integrated agent adding and mixing supply system

Abstract

The utility model relates to an integrated medicament adding and mixing supply system, and belongs to the technical field of sewage treatment. A first lifting trolley which slides up and down in the length direction of the first vertical sliding rail is arranged on the first vertical sliding rail, a first buoy is installed at the bottom of the first lifting trolley, a second lifting trolley which slides up and down in the length direction of the second vertical sliding rail is arranged on the second vertical sliding rail, and a second buoy is installed at the bottom of the second lifting trolley. A dosing pipe is installed between the first lifting trolley and the second lifting trolley, an additive supply pipe is connected to a water inlet of the dosing pipe, the other end of the additive supply pipe is connected to a water outlet of a supply pump, and a water inlet of the supply pump is communicated with the inner bottom of the dispensing stirring box; a lifting driving device for driving the second lifting trolley to synchronously lift is mounted on the sewage treatment tank. The sewage treatment device disclosed by the utility model has the beneficial effects that the reaction speed between a treatment agent and sewage is increased, and the sewage treatment effect is enhanced.

Description

Technical Field

[0001] The utility model relates to an integrated medicine dosing and mixed medicine supply system, belonging to the technical field of sewage treatment. Background Art

[0002] With the rapid development of economy and technology, people's living conditions are getting better and better. A large amount of sewage will be generated in people's life and work. In sewage treatment plants, sewage treatment agent adding and mixing devices are common equipment. It can mix the agent with sewage and turn the impurities in the sewage into flocs.

[0003] The existing Chinese utility model patent with announcement number CN214780813U discloses a sewage treatment reagent adding device, which relates to the field of sewage treatment. The sewage treatment reagent adding device comprises a reagent adding pipeline, a transmission working chassis is installed on the upper end of the reagent adding pipeline, a drive working chassis is installed on the left end of the transmission working chassis, a transmission working motor is installed on the upper end of the drive working chassis, a reagent adding slot is opened inside the reagent adding pipeline, two sets of isolating switch slides are installed inside the reagent adding slot, and the sewage treatment reagent adding device, the mechanism passes through a sieve The plate can block the rising medicine, prolong its residence time in the water body, prolong its efficacy in the water body, and further improve the sewage treatment effect. By designing the block and counterweight block as a conical structure, the resistance in the water is reduced, which facilitates the entry of the device into water and the release of the medicine, thereby improving the sewage treatment effect. This new patent mainly uses the medicine isolation mechanism to adjust the contact time between the medicine and sewage, thereby controlling the treatment effect. However, this type of medicine treatment mechanism and the sewage treatment structure are generally fixed structures, which cannot be easily disassembled for maintenance and updating, and are inflexible to use.

[0004] Although the above patent can realize the exhaust function, the current technical considerations are not comprehensive and have the following disadvantages:

[0005] 1. Since the reagent is in a state of aggregation when entering the treatment pool, it is not conducive to the rapid reaction between the reagent and the raw water;

[0006] 2. After the agent is added, the sewage and the agent cannot be quickly mixed evenly, resulting in the illusion of insufficient or excessive agent. The agent is subsequently added or reduced, and ultimately the agent is excessive or insufficient.

[0007] In order to solve one of the above problems, an integrated drug dosing and mixing supply system is urgently needed. Utility Model Content

[0008] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is: how to enhance the sewage treatment effect by driving the dosing pipe to move back and forth in the treatment tank, and to provide an integrated drug dosing and mixing supply system for this purpose.

[0009] The integrated drug dosing and mixing supply system described in the utility model is characterized in that the integrated drug dosing and mixing supply system comprises a first vertical slide rail and a second vertical slide rail arranged opposite to each other, and the first vertical slide rail and the second vertical slide rail are respectively installed on the opposite side walls of the sewage treatment tank, and the characteristic is that: the first vertical slide rail is provided with a first lifting trolley which slides up and down along its length direction, and the bottom of the first lifting trolley is installed with a first buoy, and the second vertical slide rail is provided with a second lifting trolley which slides up and down along its length direction, and the bottom of the second lifting trolley is installed with a second buoy, a dosing pipe is installed between the first lifting trolley and the second lifting trolley, the water inlet of the dosing pipe is connected to an additive supply pipe, and the other end of the additive supply pipe is connected to the water outlet of a feed pump, and the water inlet of the feed pump is connected to the inner bottom of a dispensing mixing box, and a lifting drive device for driving the first lifting trolley and the second lifting trolley to lift synchronously is installed on the sewage treatment tank.

[0010] The sewage treatment pool has a water injection end and an overflow end, and the sewage to be doped with the agent flows in the sewage treatment pool.

[0011] First, the agent to be added is added into the dispensing mixing box through the material adding port, and clean water is injected into the dispensing mixing box through the water injection port, and the agitator is turned on for stirring and diluting. After the stirring is completed, the feed pump is turned on, and the diluted agent in the dispensing mixing box is supplied to the dosing pipe through the feed pump and the additive supply pipe, and sprayed out through the liquid outlet on the dosing pipe. At the same time, the first lifting trolley and the second lifting trolley are controlled by the lifting drive device to move up and down along the first vertical slide rail and the second vertical slide rail respectively, thereby driving the dosing pipe to move back and forth, and the sewage flows in the sewage treatment tank to achieve the effect of enhancing the mixing of the treatment agent and the sewage, so that the added treatment agent can fully react with the sewage to be treated in the sewage treatment tank. Through such a setting, the reaction speed between the treatment agent and the sewage is improved, and the sewage treatment effect is enhanced.

[0012] The additive supply pipe is an existing flexible water pipe, which can be bent without affecting the water supply effect and without limiting the lifting and lowering of the dosing pipe.

[0013] Preferably, the top of the mixing tank has a material feeding port and a water injection port, and the inside of the mixing tank has a stirrer. It is an existing mixing tank that can dilute powdered and liquid flocculants or other agents.

[0014] Preferably, the dosing tube is a hollow round tube with both ends blocked and fixedly connected to the first lifting trolley and the second lifting trolley respectively, and multiple groups of liquid outlet holes are equidistantly provided along the length direction of the dosing tube. Multiple groups of liquid outlet holes are provided to achieve the effect of enhancing the mixing of the treatment agent and the sewage.

[0015] Preferably, the first vertical slide rail and the second vertical slide rail are both square steel pipes, have a preset distance from the pool wall, and are respectively fixed to the inner wall of the sewage treatment pool through corresponding connecting seats.

[0016] Preferably, the first lifting trolley includes a frame, and a walking wheel group that slides up and down along the first vertical slide rail is installed on one side of the frame; the structure of the second lifting trolley is the same as that of the first lifting trolley, and the first pontoon and the second pontoon are respectively installed on the frames of the first lifting trolley and the second lifting trolley.

[0017] Preferably, the first buoy and the second buoy are both hollow plastic barrels with air enclosed inside, buried below the water surface, and used to offset the gravity of the first lifting trolley, the dosing tube, and the second lifting trolley, so as to facilitate the lifting and lowering control of the dosing tube.

[0018] Preferably, the feed pump is a peristaltic pump.

[0019] Preferably, the lifting drive device includes an external water tank A and an external water tank B located outside the sewage treatment tank, the external water tank A has an air vent A on the top, and a steel wire rope A is connected to the external water tank A, the steel wire rope A bypasses a first reversing wheel group installed on the left side wall of the sewage treatment tank, and is connected to the first lifting trolley; the external water tank B has an air vent B on the top, and a steel wire rope B is connected to the external water tank B, the steel wire rope B bypasses a second reversing wheel group installed on the right side wall of the sewage treatment tank, and is connected to the second lifting trolley; the water inlet and outlet at the bottom of the external water tank A and the external water tank B are connected to the A port of the two-position three-way solenoid valve through a soft connecting water pipe, the P port of the two-position three-way solenoid valve is connected to the inner bottom of the water reservoir through a first water supply pipe, a water adding pump is installed on the first water supply pipe, and the T port of the two-position three-way solenoid valve is connected to the inner upper part of the water reservoir through a second return water pipe.

[0020] The two-position three-way solenoid valve is in the left position, and the water adding pump is turned on. The water adding pump injects equal amounts of clean water into the external water tank A and the external water tank B respectively through the connecting water pipe, and the weight of the external water tank A and the external water tank B increases. The external water tank A and the external water tank B respectively pull the first lifting trolley and the second lifting trolley upward through the steel wire rope A and the steel wire rope B, thereby driving the dosing pipe upward; on the contrary, the two-position three-way solenoid valve is controlled to be in the right position, and the water adding pump is turned off. The clean water in the external water tank A and the external water tank B flows back to the water reservoir through the connecting water pipe and the two-position three-way solenoid valve, and the weight of the external water tank A and the external water tank B decreases. Under the action of their own weight, the first lifting trolley and the second lifting trolley respectively pull the external water tank A and the external water tank B upward through the steel wire rope A and the steel wire rope B, thereby driving the dosing pipe downward.

[0021] Preferably, an upper travel switch and a lower travel switch for detecting the position of the external water tank A are installed on the side wall of the sewage treatment tank, and the upper travel switch and the lower travel switch are electrically connected to the signal input end of the controller respectively, and the two-position three-way solenoid valve and the water pump are electrically connected to the signal output end of the controller. The controller is a single-chip microcomputer, and after the upper travel switch detects a signal, the controller controls the two-position three-way solenoid valve to switch to the right position, and after the lower travel switch detects a signal, the controller controls the two-position three-way solenoid valve to switch to the left position, and controls the water pump to start.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The integrated reagent dosing and mixing supply system described in the utility model integrates the functions of reagent dosing and mixing supply, and drives the dosing pipe to move back and forth and up and down in the treatment tank, and the sewage flows in the sewage treatment tank, so as to achieve the effect of enhancing the mixing of the treatment reagent and the sewage, so that the added treatment reagent can fully react with the sewage to be treated in the sewage treatment tank. Through such an arrangement, the reaction speed between the treatment reagent and the sewage is improved, and the sewage treatment effect is enhanced.

[0024] The integrated reagent dosing and mixing supply system of the utility model avoids the situation that the reagents are aggregated in the treatment pool, resulting in insufficient flocculation, thereby improving the reaction rate between the reagents and the raw water.

[0025] The integrated drug dosing and mixing supply system described in the utility model comprises a first buoy and a second buoy which are both hollow plastic barrels with air enclosed inside and are buried below the water surface, and are used to offset the gravity of the first lifting trolley, the drug dosing pipe and the second lifting trolley, so as to facilitate the lifting and lowering control of the drug dosing pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0027] Figure 1 It is a schematic diagram of the structure of the utility model;

[0028] Figure 2 The partial structure diagram of the lifting drive device of the utility model is shown in FIG. Figure 1 ;

[0029] Figure 3 The partial structure diagram of the lifting drive device of the utility model is shown in FIG. Figure 2 ;

[0030] In the figure: 1, sewage treatment tank 2, first vertical slide rail 3, first lifting trolley 4, first buoy 5, second vertical slide rail 6, second lifting trolley 7, second buoy 8, first reversing wheel group 9, external water tank A 10, wire rope A 11, second reversing wheel group 12, external water tank B 13, wire rope B 14, additive supply pipe 15, feed pump 16, dispensing mixing box 17, stirrer 18, material feeding port 19, water injection port 20, dosing pipe 21, liquid outlet 22, two-position three-way solenoid valve 23, water reservoir 24, water adding pump 25, upper travel switch 26, lower travel switch. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings: The utility model is further illustrated below through specific embodiments, but is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the protection scope of the utility model.

[0032] Embodiment 1, as Figure 1-2As shown, the integrated drug dosing and mixing supply system comprises a first vertical slide rail 2 and a second vertical slide rail 5 which are arranged opposite to each other, the first vertical slide rail 2 and the second vertical slide rail 5 are respectively installed on the opposite side walls of the sewage treatment tank 1, the first vertical slide rail 2 is provided with a first lifting trolley 3 which slides up and down along its length direction, the bottom of the first lifting trolley 3 is installed with a first buoy 4, the second vertical slide rail 5 is provided with a second lifting trolley 6 which slides up and down along its length direction, the bottom of the second lifting trolley 6 is installed with a second buoy 7, a dosing pipe 20 is installed between the first lifting trolley 3 and the second lifting trolley 6, the water inlet of the dosing pipe 20 is connected to an additive supply pipe 14, the other end of the additive supply pipe 14 is connected to the water outlet of a feed pump 15, the water inlet of the feed pump 15 is connected to the inner bottom of a dispensing mixing box 16, and a lifting drive device which drives the first lifting trolley 3 and the second lifting trolley 6 to rise and fall synchronously is installed on the sewage treatment tank 1.

[0033] The sewage treatment tank 1 has a water injection end and an overflow end, and the sewage to be doped with the agent flows in the sewage treatment tank 1 .

[0034] First, the agent to be added is added into the dispensing mixing box 16 through the material adding port 18, and clean water is injected into the dispensing mixing box 16 through the water injection port 19, and the agitator 17 is turned on for stirring and dilution. After the stirring is completed, the feed pump 15 is turned on, and the diluted agent in the dispensing mixing box 16 is supplied to the dosing pipe 20 through the feed pump 15 and the additive supply pipe 14, and is sprayed out through the liquid outlet 21 on the dosing pipe 20. At the same time, the first lifting trolley 3 and the second lifting trolley 6 are controlled by the lifting drive device to move up and down along the first vertical slide rail 2 and the second vertical slide rail 5 respectively, thereby driving the dosing pipe 20 to move back and forth, and the sewage flows in the sewage treatment tank 1 to achieve the effect of enhancing the mixing of the treatment agent and the sewage, so that the added treatment agent can fully react with the sewage to be treated in the sewage treatment tank 1. Through such a setting, the reaction speed between the treatment agent and the sewage is improved, and the sewage treatment effect is enhanced.

[0035] The additive supply pipe 14 is an existing flexible water pipe, which can be bent without affecting the water supply effect and without limiting the lifting and lowering of the dosing pipe 20 .

[0036] Embodiment 2, as Figure 1-3As shown, the integrated drug dosing and mixing supply system comprises a first vertical slide rail 2 and a second vertical slide rail 5 which are arranged opposite to each other, the first vertical slide rail 2 and the second vertical slide rail 5 are respectively installed on the opposite side walls of the sewage treatment tank 1, the first vertical slide rail 2 is provided with a first lifting trolley 3 which slides up and down along its length direction, the bottom of the first lifting trolley 3 is installed with a first buoy 4, the second vertical slide rail 5 is provided with a second lifting trolley 6 which slides up and down along its length direction, the bottom of the second lifting trolley 6 is installed with a second buoy 7, a dosing pipe 20 is installed between the first lifting trolley 3 and the second lifting trolley 6, the water inlet of the dosing pipe 20 is connected to an additive supply pipe 14, the other end of the additive supply pipe 14 is connected to the water outlet of a feed pump 15, the water inlet of the feed pump 15 is connected to the inner bottom of a dispensing mixing box 16, and a lifting drive device which drives the first lifting trolley 3 and the second lifting trolley 6 to rise and fall synchronously is installed on the sewage treatment tank 1.

[0037] Furthermore, the top of the mixing tank 16 is provided with a material feeding port 18 and a water injection port 19, and the inside of the mixing tank 16 is provided with a stirrer 17. The mixing tank 16 is an existing mixing tank 16, which can dilute powdered liquid flocculants or other agents.

[0038] Furthermore, the dosing pipe 20 is a hollow round tube, both ends of which are blocked and fixedly connected to the first lifting trolley 3 and the second lifting trolley 6, respectively, and multiple groups of liquid outlet holes 21 are equidistantly provided along the length direction of the dosing pipe 20. Multiple groups of liquid outlet holes 21 are provided to achieve the effect of enhancing the mixing of the treatment agent and the sewage.

[0039] Furthermore, the first vertical slide rail 2 and the second vertical slide rail 5 are both square steel pipes, have a preset distance from the pool wall, and are respectively fixed to the inner wall of the sewage treatment pool 1 through corresponding connecting seats.

[0040] Furthermore, the first lifting trolley 3 includes a frame, and a walking wheel group that slides up and down along the first vertical slide rail 2 is installed on one side of the frame; the structure of the second lifting trolley 6 is the same as that of the first lifting trolley 3, and the first pontoon 4 and the second pontoon 7 are respectively installed on the frames of the first lifting trolley 3 and the second lifting trolley 6.

[0041] Furthermore, the first buoy 4 and the second buoy 7 are both hollow plastic barrels with air enclosed inside, buried below the water surface, and are used to offset the gravity of the first lifting trolley 3, the dosing tube 20, and the second lifting trolley 6, so as to facilitate the lifting and lowering control of the dosing tube 20.

[0042] Furthermore, the feed pump 15 is a peristaltic pump.

[0043] Furthermore, the lifting drive device includes an external water tank A9 and an external water tank B12 located outside the sewage treatment tank 1, the top of the external water tank A9 has a vent A, the external water tank A9 is connected to a wire rope A10, the wire rope A10 passes around a first reversing wheel group 8 installed on the left side wall of the sewage treatment tank 1, and is connected to the first lifting trolley 3; the top of the external water tank B12 has a vent B, the external water tank B12 is connected to a wire rope B13, the wire rope B13 passes around Through the second reversing wheel set 11 installed on the right side wall of the sewage treatment tank 1, and connected to the second lifting trolley 6; the water inlet and outlet at the bottom of the external water tank A9 and the external water tank B12 are connected to the A port of the two-position three-way solenoid valve 22 through a soft connecting water pipe, the P port of the two-position three-way solenoid valve 22 is connected to the inner bottom of the water reservoir 23 through a first water supply pipe, a water adding pump 24 is installed on the first water supply pipe, and the T port of the two-position three-way solenoid valve 22 is connected to the inner upper part of the water reservoir 23 through a second return water pipe.

[0044] The two-position three-way solenoid valve 22 is in the left position, and the water pump 24 is turned on. The water pump 24 injects equal amounts of clean water into the external water tank A9 and the external water tank B12 through the connecting water pipes. The weight of the external water tank A9 and the external water tank B12 increases, and the external water tank A9 and the external water tank B12 pull the first lifting trolley 3 and the second lifting trolley 6 upward through the wire rope A10 and the wire rope B13, respectively, thereby driving the dosing pipe 20 upward; on the contrary, the control The two-position three-way solenoid valve 22 is in the right position, the water adding pump 24 is closed, and the clean water in the external water tank A9 and the external water tank B12 flows back to the water reservoir 23 through the connecting water pipe and the two-position three-way solenoid valve 22. The weight of the external water tank A9 and the external water tank B12 becomes smaller, and the first lifting trolley 3 and the second lifting trolley 6 respectively pull the external water tank A9 and the external water tank B12 upward through the wire rope A10 and the wire rope B13 under the action of their own weight, thereby driving the dosing pipe 20 downward.

[0045] Embodiment 3 is further improved on the basis of Embodiment 2, an upper travel switch 25 and a lower travel switch 26 for detecting the position of the external water tank A9 are installed on the side wall of the sewage treatment pool 1, and the upper travel switch 25 and the lower travel switch 26 are electrically connected to the signal input end of the controller respectively, and the two-position three-way solenoid valve 22 and the water pump 24 are electrically connected to the signal output end of the controller. The controller is a single-chip microcomputer, and after the upper travel switch 25 detects a signal, the controller controls the two-position three-way solenoid valve 22 to switch to the right position, and after the lower travel switch 26 detects a signal, the controller controls the two-position three-way solenoid valve 22 to switch to the left position, and controls the water pump 24 to start.

[0046] The modification of the prior art by this specific implementation method lies in the hardware part, and the computer program involved is a simple program that can be easily implemented by those skilled in the art using the existing computer program development platform and well-known programming methods.

[0047] In this article, forming switches and controllers is only a simple use of their functions and does not involve improvements in methods, procedures, etc.

[0048] The integrated reagent dosing and mixing supply system described in the utility model integrates the functions of reagent dosing and mixing supply, and drives the dosing pipe to move back and forth and up and down in the treatment tank, and the sewage flows in the sewage treatment tank, so as to achieve the effect of enhancing the mixing of the treatment reagent and the sewage, so that the added treatment reagent can fully react with the sewage to be treated in the sewage treatment tank. Through such an arrangement, the reaction speed between the treatment reagent and the sewage is improved, and the sewage treatment effect is enhanced.

[0049] The integrated reagent dosing and mixing supply system of the utility model avoids the situation that the reagents are aggregated in the treatment pool, resulting in insufficient flocculation, thereby improving the reaction rate between the reagents and the raw water.

[0050] The integrated drug dosing and mixing supply system described in the utility model comprises a first buoy and a second buoy which are both hollow plastic barrels with air enclosed inside and are buried below the water surface, and are used to offset the gravity of the first lifting trolley, the drug dosing pipe and the second lifting trolley, so as to facilitate the lifting and lowering control of the drug dosing pipe.

[0051] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the present utility model is defined by the attached claims and their equivalents.

[0052] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. An integrated drug dosing and mixing supply system, comprising a first vertical slide rail and a second vertical slide rail arranged opposite to each other, wherein the first vertical slide rail and the second vertical slide rail are respectively installed on two opposite side walls of a sewage treatment tank, characterized in that: The first vertical slide rail is provided with a first lifting trolley which slides up and down along the length direction thereof, a first float is installed at the bottom of the first lifting trolley, the second vertical slide rail is provided with a second lifting trolley which slides up and down along the length direction thereof, a second float is installed at the bottom of the second lifting trolley, a dosing pipe is installed between the first lifting trolley and the second lifting trolley, an additive supply pipe is connected to the water inlet of the dosing pipe, the other end of the additive supply pipe is connected to the water outlet of the feed pump, the water inlet of the feed pump is connected to the inner bottom of the dispensing mixing box, and a lifting drive device which drives the first lifting trolley and the second lifting trolley to rise and fall synchronously is installed on the sewage treatment tank.

2. The integrated drug dosing and mixing supply system according to claim 1 is characterized in that: The top of the medicine dispensing and mixing box is provided with a material adding port and a water injection port, and the interior of the medicine dispensing and mixing box is provided with a stirrer.

3. The integrated drug dosing and mixing supply system according to claim 2 is characterized in that: The dosing tube is a hollow round tube with both ends blocked and fixedly connected to the first lifting trolley and the second lifting trolley respectively. A plurality of groups of liquid outlet holes are equidistantly arranged along the length direction of the dosing tube.

4. The integrated drug dosing and mixing supply system according to claim 3 is characterized in that: The first vertical slide rail and the second vertical slide rail are both square steel pipes.

5. The integrated drug dosing and mixing supply system according to claim 4 is characterized in that: The first lifting trolley includes a frame, and a walking wheel group that slides up and down along a first vertical slide rail is installed on one side of the frame; the structure of the second lifting trolley is the same as that of the first lifting trolley, and the first pontoon and the second pontoon are respectively installed on the frames of the first lifting trolley and the second lifting trolley.

6. The integrated drug dosing and mixing supply system according to claim 5 is characterized in that: The first buoy and the second buoy are both hollow plastic barrels with air enclosed therein.

7. The integrated drug dosing and mixing supply system according to claim 6, characterized in that: The feed pump is a peristaltic pump.

8. The integrated drug dosing and mixing supply system according to claim 7, characterized in that: The lifting drive device includes an external water tank A and an external water tank B located outside the sewage treatment tank. The top of the external water tank A is provided with an air vent A, and the external water tank A is connected with a steel wire rope A. The steel wire rope A passes around a first reversing wheel group installed on the left side wall of the sewage treatment tank and is connected to a first lifting trolley; the top of the external water tank B is provided with an air vent B, and the external water tank B is connected with a steel wire rope B. The steel wire rope B passes around a second reversing wheel group installed on the right side wall of the sewage treatment tank and is connected to a second lifting trolley; the water inlets and outlets at the bottom of the external water tank A and the external water tank B are both connected to the A port of the two-position three-way solenoid valve through soft connecting water pipes, the P port of the two-position three-way solenoid valve is connected to the inner bottom of the water storage tank through a first water supply pipe, a water supply pump is installed on the first water supply pipe, and the T port of the two-position three-way solenoid valve is connected to the inner upper part of the water storage tank through a second return water pipe.

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