Automatic blowdown device and water storage equipment

Abstract

The invention belongs to the technical field of valve control, and particularly relates to an automatic blowdown device and water storage equipment, the automatic blowdown device comprises an upper valve body, a lower valve body and a valve assembly, the upper valve body is detachably connected with the lower valve body, an opening is formed in the joint of the lower valve body and the upper valve body, and the opening is communicated with an outlet of the lower valve body; the valve assembly is arranged at the opening, the valve assembly is connected with a floating ball, and the floating ball is located between the inlet of the upper valve body and the valve assembly; sludge entering the upper valve body enables the density of a medium in the upper valve body to be increased so as to increase the buoyancy of the floating ball, and sewage is discharged when the buoyancy of the floating ball exceeds a preset buoyancy threshold value. In the application, the opening of the valve assembly is controlled by the density difference generated by the precipitation degree of the sludge in the upper valve body, and after the sludge is discharged, the density difference is reduced and the valve assembly is closed again, so that a controller and an electric valve with higher cost do not need to be mounted, excessive discharge or insufficient discharge cannot be caused, and the practicability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of valve control, and in particular relates to an automatic sewage discharge device and water storage equipment. Background Art

[0002] Water tanks and water towers are commonly used water storage equipment in industrial activities and residents' lives. They can also be used as water buffer and circulation equipment. During the operation of such equipment, sludge and debris will slowly settle at the bottom of the equipment. If the equipment is not cleaned and discharged for a long time, it will affect the water quality and even cause equipment failure.

[0003] Existing sewage treatment operation methods, such as Fig.11 , Fig.12 As shown, there are generally manual sewage discharge and timed control electric valve for electric sewage discharge; among them, manual sewage discharge may be affected by the operator and may cause problems such as irregular sewage discharge, insufficient sewage discharge or excessive sewage discharge; and the electric sewage discharge method requires the installation of electric valves, power cords, control electrical appliances and other equipment, which is troublesome to install and has a high equipment investment cost. Therefore, it is necessary to improve an automatic sewage discharge device with lower cost and better sewage discharge effect. Summary of the invention

[0004] The purpose of this application is to provide an automatic sewage discharge device and water storage equipment to solve the problem that the existing sewage discharge operation method cannot well take into account the equipment cost and sewage discharge effect.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows: In a first aspect, an automatic sewage discharge device comprises an upper valve body, a lower valve body and a valve assembly, wherein the upper valve body is detachably connected to the lower valve body, an opening is provided at the connection between the lower valve body and the upper valve body, and the opening is connected to the outlet of the lower valve body; the valve assembly is provided at the opening, and the valve assembly is connected to a float, and the float is located between the inlet of the upper valve body and the valve assembly; the sludge continuously entering the upper valve body increases the density of the medium in the upper valve body and increases the buoyancy of the float, and drives the valve assembly to open the opening when the buoyancy of the float exceeds a preset buoyancy threshold.

[0006] In the present application, after the device is put into operation, the valve assembly is initially in a closed state with respect to the opening and the outlet of the lower valve body, and the inner cavity of the upper valve body is connected to the sewage outlet to maintain connectivity with water connected to equipment such as water tanks and water towers; sludge continuously enters the inner cavity of the upper valve body through the sewage outlet, causing the buoyancy of the float to continuously increase. When the buoyancy exceeds the preset buoyancy threshold, the float will float up and drive the valve assembly to open the opening, and the sludge will flow out of the opening. After a certain amount of sludge is discharged, the float will float down and drive the valve assembly to close the opening, thereby achieving the effect of automatic and quantitative sewage discharge without the need to install timers, electric valves, etc., which is lower in cost.

[0007] Furthermore, the inlet of the upper valve body and the outlet of the lower valve body are both provided with external connection parts, and the external connection parts are flanges or threads. Such a structural design has strong versatility, can be compatible with many sewage discharge scenarios, and is easy to install, replace, and disassemble.

[0008] Furthermore, a support frame is installed in the upper valve body; the valve assembly includes a spring and a valve plate, the valve plate is connected to the float through a connecting rod, and the connecting rod passes through the float connecting rod hole provided on the support frame; the spring is sleeved on the connecting rod, one end of the spring is connected to the valve plate, and the other end is connected to the support frame.

[0009] Further, a mounting groove is provided on the middle inner wall of the upper valve body, and the support frame is limitedly installed in the mounting groove; or, a mounting groove is provided on the inner wall of the upper valve body close to one end of the lower valve body, and the support frame is limitedly installed in the mounting groove.

[0010] In the present application, the installation groove can be preset, so that the process of installing the support frame, fixing the valve assembly, etc. is more convenient and less difficult.

[0011] Furthermore, a fixing component is installed at the connection between the connecting rod and the valve plate, and the fixing component is used to adjust the position of the valve plate on the connecting rod and fix it.

[0012] In the present application, the position of the valve plate on the connecting rod is adjusted by a fixed component, so that the buoyancy threshold can be adjusted to facilitate adjustment of the amount of sewage discharged each time, which has higher flexibility and better adaptability to higher water quality requirements.

[0013] Furthermore, a first seal is provided at the connection between the fixed assembly and the valve plate; a gasket groove is opened at one end of the lower valve body close to the float, a second seal is provided in the gasket groove, and the valve plate is in compression contact with the second seal; a third seal is provided between the upper valve body and the lower valve body.

[0014] In the present application, by providing multiple seals, the sealing performance of the entire device can be guaranteed, and the possibility of leakage of the device can be reduced or eliminated.

[0015] Furthermore, the first sealing member includes pressure blocks installed on the upper and lower surfaces of the valve plate, and a first sealing gasket is installed between the pressure block on the upper surface of the valve plate and the upper surface of the valve plate or between the pressure block on the lower surface of the valve plate and the lower surface of the valve plate.

[0016] Furthermore, the fixing assembly includes a locking nut, and a thread is provided at one end of the connecting rod close to the valve plate, and the connecting rod is connected to the locking nut via the thread.

[0017] In a second aspect, the present invention further provides a water storage device, comprising a water tank and an automatic sewage discharge device; the water tank is at least provided with a water inlet, a water outlet and a sewage discharge outlet, and the automatic sewage discharge device is arranged at the sewage discharge outlet.

[0018] Furthermore, it also includes a normally open valve, which is installed at the sewage outlet, and the automatic sewage discharge device is fixedly connected to the normally open valve.

[0019] The invention adopting the above technical solution has the following advantages: The automatic sewage discharge device can be used to discharge sewage from equipment such as water tanks and water towers, and is installed at the sewage outlet of the equipment. After being installed and put into operation, the valve assembly is in a closed state with respect to the opening and the outlet of the lower valve body, and the inner cavity of the upper valve body is connected to the sewage outlet to maintain communication with the water connected to the water tank, water tower and other equipment. The sludge in the water continuously enters the inner cavity of the upper valve body through the sewage outlet. Since the density of the mixture composed of sludge and water is greater than the density of single water, the buoyancy of the float ball is continuously increasing compared with that of water. When the buoyancy exceeds the preset buoyancy threshold, the float ball will float up and drive the valve assembly to open the opening, and the sludge will flow out from the opening. After a certain amount of sludge is discharged, the float ball will float down and drive the valve assembly to close the opening, thereby achieving the effect of automatic and quantitative sewage discharge without the need to install a timer, an electric valve, etc., and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings; Figure 1 It is a schematic diagram of the exploded structure of an automatic sewage discharge device of the present invention; Figure 2 It is a perspective schematic diagram of an automatic sewage discharge device of the present invention; Figure 3 It is a schematic diagram of the explosion structure of the whole valve assembly of the present invention; Figure 4 It is a schematic diagram of the overall structure of the lower valve body of the present invention; Figure 5 A second perspective structural schematic diagram of the valve assembly of the present invention as a whole; Figure 6A second perspective structural schematic diagram of the valve assembly of the present invention as a whole; Figure 7 It is a schematic diagram of the overall structure of the support frame of the present invention; Figure 8 It is a cross-sectional schematic diagram of an automatic sewage discharge device of the present invention in a closed state; Fig. 9 It is a cross-sectional schematic diagram of an automatic sewage discharge device of the present invention in an open state; Fig.10 for Fig. 9 The enlarged schematic diagram of the center C; Fig.11 It is the overall front view of the existing water tank using artificial sewage discharge; Fig.12 This is the overall front view of the existing water tank that uses an electric valve and a time controller to discharge sewage; Fig.13 A schematic diagram of an application environment of an automatic sewage discharge device of the present invention; The main component symbols are described as follows: 100, automatic sewage discharge device; 101, upper valve body; 102, bolt; 103, float; 104, support frame; 1041, float connecting rod hole; 1042, spring fixing ring; 1043, flange; 105, spring; 106, upper pressing block; 107, valve plate; 108, first sealing gasket; 109, lower pressing block; 110, second sealing gasket; 111, lower valve body; 1111, opening; 112. Flange; 113. Gasket groove; 114. Third sealing gasket; 115. Connecting rod; 116. Fixing bolt; 117. Fixing nut; 118. Anti-loosening nut; 200. Water tank; 201. Water inlet; 202. Maintenance hole; 203. Water outlet; 204. Sewage outlet; 205. Sludge; 206. Overflow outlet; 300. Electric valve; 310. Time controller; 400. Normally open valve. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions of the specification, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In addition, the directional terms mentioned in the embodiments, such as "upper", "lower", "top", "bottom", "left", "right", "front", "back", etc., are only referenced to the directions of the drawings and are not used to limit the scope of protection of the present invention. Embodiment 1,

[0022] like Figure 1 , Fig.13As shown, an automatic sewage discharge device of this embodiment includes an upper valve body 101, a lower valve body 111 and a valve assembly. In order to facilitate the connection and fixation of the device with the water tank 200, a flange 112 is integrally processed on the upper valve body 101 and the lower valve body 111. A threaded hole is opened on the flange 112. The upper valve body 101 is connected to the sewage outlet 204 of the water tank 200 through the flange 112 and fixed by screws to achieve sewage discharge. The lower valve body 111 can be connected to the sewage pipe through the flange 112 to achieve the external discharge of sludge. The upper valve body 101 and the lower valve body 111 are detachably connected, for example, Figure 2 , Fig.10 In the embodiment, the upper valve body 101 and the lower valve body 111 can be detachably connected by bolts 102 and nuts; a third sealing gasket 114 is installed between the upper valve body 101 and the lower valve body 111, which increases the sealing performance of the connection between the lower valve body 111 and the upper valve body 101. An opening 1111 is provided at the connection between the lower valve body 111 and the upper valve body 101, and the opening 1111 is for sludge to pass through; the opening 1111 is connected to the outlet of the lower valve body 111; the valve assembly is provided at the opening 1111, and the valve assembly is connected to the float 103 through the connecting rod 115, which can be referred to Figure 8 and Fig. 9 The float 103 is located between the entrance of the upper valve body 101 and the valve assembly; the sludge that continuously enters the upper valve body 101 increases the density of the medium in the upper valve body 101 and increases the buoyancy of the float 103, and when the buoyancy of the float 103 exceeds a preset buoyancy threshold, it drives the valve assembly to open the opening 1111, wherein the buoyancy threshold is pre-set, and the medium is a mixture of sludge and water.

[0023] refer to Figure 8 and Fig. 9 During the operation of the device in this embodiment, at the beginning, the valve assembly closes the opening 1111, and the inner cavity A of the upper valve body 101 does not contain water or a water mixture, and the inner cavity B of the lower valve body 111 is filled with water due to being connected to the water tank 200; thereafter, the water stored in the water tank 200 will accumulate sludge, and the sludge enters from the entrance of the upper valve body 101, resulting in a continuous decrease in the ratio of water to sludge in the inner cavity A of the upper valve body 101, so that the density in the inner cavity A of the upper valve body 101 increases; when it increases to a certain extent, that is, when the buoyancy of the float 103 exceeds the preset buoyancy threshold, the float will be displaced, and the valve assembly will be driven to open the opening 1111, and the sludge will enter the inner cavity B of the lower valve body 111 and be discharged. In fact, the buoyancy threshold in this embodiment can be obtained through a limited number of experiments; and, according to different sludge discharge scenarios, a corresponding appropriate buoyancy threshold can be set to improve flexibility in the discharge cycle and discharge volume, thereby ensuring that the device can operate long-term and stably without affecting the water quality in the water tank 200.

[0024] In the present application, when the automatic sewage discharge device 100 is working, the valve assembly is initially in a closed state with respect to the opening 1111 and the outlet of the lower valve body 111, and the inner cavity A of the upper valve body 101 is connected to the sewage discharge port 204, so as to maintain the connection between the water in the inner cavity of the upper valve body 101 and the water connected to the water tank 200; the sludge continuously enters the inner cavity A of the upper valve body 101 through the sewage discharge port 204, so that the buoyancy of the float 103 continuously increases. When the buoyancy exceeds the buoyancy threshold, the float 103 floats up and drives the valve assembly to open the opening 1111, and the sludge flows out from the opening 1111. After a certain amount of sludge is discharged, the float 103 floats down and drives the valve assembly to close the opening 1111, thereby achieving the effect of automatic and quantitative sewage discharge. Compared with the existing operation mode using the electric valve 300 and the time controller 310 (or timer), the present embodiment does not need to install timers, electric valves 300 and other equipment, and the cost is lower.

[0025] like Figure 2 As shown, in this embodiment, for example, flanges 112 are provided at the inlet of the upper valve body 101 and the outlet of the lower valve body 111. Such a structural design has strong versatility, can be compatible with many sewage discharge scenarios, and is easy to install, replace, and disassemble.

[0026] For example, in actual selection of this embodiment, threads may be selected to replace the flange 112 to achieve external connection capabilities at the inlet of the upper valve body 101 and the outlet of the lower valve body 111.

[0027] Therefore, the several external connection methods provided in this embodiment can make the connection between the automatic sewage discharge device 100 and the sewage discharge port 204 of the water tank 200 compatible with more specifications and installation methods, and has high practicality.

[0028] like Figures 5 to 7 As shown, in the actual design of this embodiment, a support frame 104 is installed in the upper valve body 101; the support frame 104 includes a float connecting rod hole 1041 and a spring fixing ring 1042, and the spring fixing ring 1042 is fixedly installed on the periphery of the float connecting rod hole 1041, wherein the inner diameter of the float connecting rod hole 1041 is larger than the diameter of the connecting rod 115, and can allow the connecting rod 115 to pass through, and can limit the radial displacement of the connecting rod 115, while allowing the axial displacement of the connecting rod 115.

[0029] like Figure 1 As shown, the valve assembly of this embodiment includes a spring 105 and a valve plate 107, and a connecting rod 115 passes through a float connecting rod hole 1041 provided on the support frame 104; the spring 105 is sleeved on the connecting rod 115, one end of the spring 105 is connected to the valve plate 107, and the other end is connected to the support frame 104.

[0030] like Fig.10As shown, the support frame 104 of this embodiment also includes a flange 1043, and the flange 1043 can be clamped at the connection between the upper valve body 101 and the lower valve body 111. Among them, a mounting groove is provided on the inner wall of the upper valve body 101 close to one end of the lower valve body 111, and the support frame 104 is limitedly installed in the mounting groove. After the upper valve body 101 and the lower valve body 111 are connected and fixed, the mounting groove limits and fixes the flange 1043, so that the support frame 104 is also fixed. Such a structural design can select support frames 104 of different specifications according to actual needs, so that the spring 105 can be more practically limited, and the relative relationship and structural strength of the support frame 104, the spring 105, and the valve assembly can be guaranteed to be more balanced.

[0031] Specifically, a mounting groove can be provided on the inner wall of the upper valve body 101 at the connection between the upper valve body 101 and the lower valve body 111, so that the mounting groove can cooperate with the flange 1043 to limit and fix the support frame 104; thus, the limiting of the support frame 104 is convenient, and it is also more convenient when disassembling. The mounting groove on the upper valve body 101 can be preset, so that the process of installing the support frame 104 and fixing the valve assembly is more convenient and less difficult.

[0032] like Figure 1 As shown, illustratively, the spring 105 and the valve plate 107 may be connected by welding; the spring 105 and the support frame 104 may be connected by welding, which can increase the axial stability between the structures.

[0033] In fact, illustratively, unlike the welding method, a spring fixing ring 1042 is also provided on the valve plate 107, which is combined with the spring fixing ring 1042 on the support frame 104 to limit the position of the spring 105, thereby preventing the spring 105 from popping out during the extension and retraction process, thereby improving the stability of the overall structure.

[0034] Specifically, a fixing assembly is installed at the connection between the connecting rod 115 and the valve plate 107, and the fixing assembly is used to adjust the position of the valve plate 107 on the connecting rod 115 and fix it. Among them, the end of the connecting rod 115 is first passed through the center of the valve plate 107 and is arranged concentrically therewith, and then the connecting rod 115 is fixed by the fixing assembly. Exemplarily, the fixing assembly includes two anti-loosening nuts 118, and threads are provided at one end of the connecting rod 115 close to the valve plate 107 to cooperate with it. The connecting rod 115 is connected to the anti-loosening nuts 118 through threads; the two anti-loosening nuts 118 can be used in combination to fix the connecting rod 115 and prevent it from loosening. In fact, before fixing, the position of the connecting rod 115 can be adjusted, that is, the preload force of the spring 105 between the support frame 104 and the valve plate 107 can be adjusted, so that the effect of adjusting the distance between the float 103 and the opening 1111 can be achieved, and the effect of adjusting the buoyancy threshold can be achieved indirectly, with high flexibility. Such a structure can adjust the position of the valve plate on the connecting rod through a fixed component, so that the buoyancy threshold can be adjusted to adjust the amount of sewage discharged each time, which is more flexible and better adaptable to higher water quality requirements.

[0035] like Figure 1 , Figure 2 As shown, in this embodiment, a first sealing member is provided at the connection between the fixing assembly and the valve plate 107, and the first sealing member includes a pressing block installed on the upper and lower surfaces of the valve plate 107 by bolts and nuts. A first sealing gasket 108 is installed between the pressing block on the upper surface of the valve plate 107, i.e., the upper pressing block 106, and the upper surface of the valve plate 107, or between the pressing block on the lower surface of the valve plate 107, i.e., the lower pressing block 109, and the lower surface of the valve plate 107; and the bolts and nuts are as follows Figure 5 , Figure 6 The fixing bolt 116 and the fixing nut 117 are shown. The combination of the upper pressing block 106, the lower pressing block 109 and the first sealing gasket 108 can improve the sealing performance of the connection of the connecting rod 115. At the same time, the detachable connection of the connecting rod 115 can be realized, the position of the connecting rod 115 can be adjusted, and the first sealing gasket 108 can be replaced. A gasket groove 113 is provided at one end of the lower valve body 111 close to the float 103. The second sealing gasket 110 is arranged in the gasket groove 113. The valve plate 107 is pressed and contacted with the second sealing gasket 110. In this way, when the opening 1111 is sealed, the sealing performance can be guaranteed to be good; in addition, a third sealing gasket 114 is arranged between the upper valve body 101 and the lower valve body 111. In this way, at the connection positions of multiple structures, by setting multiple sealing gaskets, the sealing performance of the entire device can be guaranteed, and the possibility of leakage of the device can be reduced or eliminated. Embodiment 2,

[0036] like Figure 1 , Figures 11 to 13As shown, a water storage device provided in this embodiment includes a water tank 200 and the automatic sewage discharge device 100 of the above-mentioned embodiment 1; the water tank is provided with a water inlet 201, a water outlet 203, a sewage discharge outlet 204, and an overflow outlet 205, and the automatic sewage discharge device 100 is arranged at the sewage discharge outlet 204.

[0037] It should be noted that, in order to discharge sewage, conventional water tanks 200 have two situations: one is to set a maintenance hole 202 on the top of the water tank 200, and manually enter through the maintenance hole 202 to clean the sewage, which is time-consuming and laborious; the other is to set an electric valve 300 at the sewage outlet, and the electric valve 300 is electrically connected to the time controller 310 for control, and the cost of this structure is relatively high. The automatic sewage discharge device 100 in this embodiment uses the density difference caused by the continuous accumulation of sludge 206 to increase the buoyancy of the float and open the opening 1111. After the sludge 206 is discharged, the density difference decreases, which reduces the buoyancy of the float, and the spring 105 makes the valve plate 107 seal the opening 1111 to close it. The structure is simple and the automation of sewage discharge is realized, there is no over-discharge or under-discharge, and it is highly practical.

[0038] In fact, in a specific application, the water storage device further includes a normally open valve 400, which is installed at the sewage outlet 204, and the automatic sewage discharge device 100 is fixedly connected to the normally open valve 400. The normally open valve 400 can close the sewage outlet 204 when the automatic sewage discharge device 100 is installed or replaced, or when the sealing gasket is replaced.

[0039] The above is a detailed introduction to an automatic sewage discharge device provided by the present invention. The description of the specific embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An automatic sewage discharge device, comprising an upper valve body (101), a lower valve body (111) and a valve assembly, wherein the upper valve body (101) and the lower valve body (111) are detachably connected, and an opening (1111) is provided at the connection between the lower valve body (111) and the upper valve body (101), wherein the opening is connected to an outlet of the lower valve body (111); characterized in that: The valve assembly is arranged at the opening (1111), and is connected to a float (103), wherein the float (103) is located between the inlet of the upper valve body (101) and the valve assembly; the sludge continuously entering the upper valve body (101) increases the density of the medium in the upper valve body (101), thereby increasing the buoyancy of the float (103), and when the buoyancy of the float (103) exceeds a preset buoyancy threshold, the valve assembly is driven to open the opening (1111).

2. The automatic sewage discharge device according to claim 1, characterized in that: The inlet of the upper valve body (101) and the outlet of the lower valve body (111) are both provided with external connection parts, and the external connection parts are flanges (112) or threads.

3. The automatic sewage discharge device according to claim 1, characterized in that: A support frame (104) is installed in the upper valve body (101); the valve assembly comprises a spring (105) and a valve plate (107); the valve plate (107) is connected to the float (103) via a connecting rod (115); the connecting rod (115) passes through a float connecting rod hole (1041) provided on the support frame (104); the spring (105) is sleeved on the connecting rod (115); one end of the spring (105) is connected to the valve plate (107), and the other end is connected to the support frame (104).

4. The automatic sewage discharge device according to claim 3, characterized in that: A mounting groove is provided on the inner wall at the middle of the upper valve body (101), and the support frame (104) is installed in a limited position in the mounting groove; or, a mounting groove is provided on the inner wall at one end of the upper valve body (101) close to the lower valve body (111), and the support frame (104) is installed in a limited position in the mounting groove.

5. The automatic sewage discharge device according to claim 3, characterized in that: A fixing component is installed at the connection between the connecting rod (115) and the valve plate (107), and the fixing component is used to adjust the position of the valve plate (107) on the connecting rod (115) and fix it.

6. The automatic sewage discharge device according to claim 5, characterized in that: A first sealing member is provided at the connection between the fixing assembly and the valve plate (107); a gasket groove (113) is provided at one end of the lower valve body (111) close to the float (103), a second sealing member is provided in the gasket groove (113), and the valve plate (107) is in compression contact with the second sealing member; and a third sealing member is provided between the upper valve body (101) and the lower valve body (111).

7. The automatic sewage discharge device according to claim 6, characterized in that: The first sealing component comprises a pressure block mounted on the upper and lower surfaces of the valve plate (107), and a first sealing gasket is mounted between the pressure block on the upper surface of the valve plate (107) and the upper surface of the valve plate (107), or between the pressure block on the lower surface of the valve plate (107) and the lower surface of the valve plate (107).

8. The automatic sewage discharge device according to claim 5, characterized in that: The fixing assembly comprises a locking nut (118), and a thread is provided at one end of the connecting rod (115) close to the valve plate (107), and the connecting rod (115) is connected to the locking nut (118) via the thread.

9. A water storage device, characterized in that: It comprises a water tank (200) and an automatic sewage discharge device (100) according to any one of claims 1 to 8; the water tank (200) is provided with at least a water inlet (201), a water outlet (203) and a sewage discharge port (204); and the automatic sewage discharge device (100) is arranged at the sewage discharge port (204).

10. The water storage device according to claim 9, characterized in that: It also comprises a normally open valve (400), the normally open valve (400) being installed at the sewage outlet (204), and the automatic sewage discharge device (100) being fixedly connected to the normally open valve (400).

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