Sewage lifting pump station with backwashing device

Abstract

The utility model relates to a sewage lifting pump station with a backwashing device, which belongs to the field of sewage lifting pump stations and comprises a sewage lifting box, a sewage pump, a coupling device, a water outlet pipe and a check valve, an exhaust pipe is mounted on the water outlet pipe, one end of the exhaust pipe is communicated with the water outlet pipe, and the other end of the exhaust pipe is positioned in the sewage lifting box. And the end of the exhaust pipe faces the inner wall of the sewage lifting box. The exhaust pipe of the pump station can avoid suffocation of the sewage pump, and can wash dirt accumulated on the inner bottom wall of the sewage lifting box, so that the dirt is prevented from being accumulated on the inner bottom wall of the sewage lifting box.

Description

Technical Field

[0001] The utility model belongs to the field of environmental protection equipment, in particular to a sewage lifting pump station with a backwashing device. Background Art

[0002] Catering wastewater must be separated into oil and water by an oil-water separator before it can be discharged into the municipal pipe network. Oil-water separators are primarily installed in basements. Because the sewage discharge point in basements is lower than the municipal pipe network, sewage discharged into the municipal pipe network must be pressurized by a sewage lift pump station before it can be discharged. Therefore, oil-water separators installed in basements require a sewage lift pump station to be installed at the rear end.

[0003] At present, the common practice of sewage lifting pump stations in the industry is to install two sewage pumps in the sewage lifting tank. The two sewage pumps are respectively connected to the corresponding coupling bases. The sewage at the sewage pump outlet enters the coupling base and flows out from the coupling base outlet. Check valves are installed on the pipes at the outlets of the two coupling bases. The function of the check valves is to prevent the backflow of outdoor sewage and the formation of circulating water between the two sewage pumps after the sewage pumps are started. Finally, the pipes at the outlets of the two coupling bases are combined into a main outlet pipe connected to the outside, and the main outlet pipe is connected to the municipal pipe network. Due to the presence of the two check valves, the pipes at the outlets of the two sewage pumps are both closed.

[0004] When the sewage water level in the sewage lifting tank is lower than the volute of the sewage pump, that is, the water level in the sewage lifting tank reaches the pump stop level, if the float switch is damaged, the sewage pump cannot stop immediately, the sewage pump will rotate and cause air to be drawn into the volute of the sewage pump; or when the sewage lifting tank is filled with water for the first time, a small amount of air will also be replaced in the volute, causing air to be drawn into the volute of the sewage pump.

[0005] Since the pipes at the outlets of the two sewage pumps are closed by check valves, the air drawn into the volute of the sewage pump is not easy to be discharged, which will cause air suffocation in the volute of the sewage pump. At this time, the pressure of the sewage pump drops and the sewage pump cannot be discharged even if it runs idle.

[0006] In addition, after the restaurant wastewater is separated by the oil-water separator, it still contains a small amount of dirt. The unseparated dirt will be stored in the sewage lifting tank. When the sewage lifting tank is used for a long time, the dirt will accumulate at the bottom of the tank and condense and clump, affecting the use of the sewage lifting tank. In addition, a small amount of floating objects in the restaurant wastewater will float on the liquid surface in the sewage lifting tank, which will also affect the use of the sewage lifting tank. Utility Model Content

[0007] The sewage lifting pump station with a backwashing device of the present invention is designed to solve the above-mentioned problems.

[0008] The sewage lifting pump station with a backwash device of the present invention includes a sewage lifting box, a sewage pump, a coupling device, an outlet pipe and a check valve. An exhaust pipe is installed on the outlet pipe. One end of the exhaust pipe is connected to the outlet pipe, and the other end is in the sewage lifting box. This end of the exhaust pipe faces the inner wall of the sewage lifting box.

[0009] Furthermore, one end of the exhaust pipe away from the water outlet pipe faces the inner bottom wall of the sewage lifting tank.

[0010] Because the dirt will fall on the inner bottom wall of the sewage lifting tank due to its own weight, when the sewage pump pumps water, part of the sewage will flow out from the exhaust pipe, achieving the effect of flushing the inner bottom wall of the sewage lifting tank, so one end of the exhaust pipe is facing the inner bottom wall of the sewage lifting tank, which can make the flushing effect more obvious.

[0011] Furthermore, the inner diameter of the exhaust pipe is smaller than the inner diameter of the water outlet pipe.

[0012] The inner diameter of the exhaust pipe is smaller than that of the outlet pipe. According to Bernoulli's principle, the water flow rate inside the exhaust pipe with a smaller inner diameter is faster. Therefore, if the exhaust pipe is designed to have the same inner diameter as the outlet pipe, the flow rate of the drain pipe is recorded as A; if the exhaust pipe is designed to have a smaller inner diameter than the outlet pipe, the flow rate of the exhaust pipe is recorded as B. B will be greater than A, so this design has a better effect on flushing the inner bottom wall of the sewage lifting tank.

[0013] Furthermore, a valve is installed on the exhaust pipe, and the valve is normally open.

[0014] When overhauling a sewage pump, the exhaust pipe must be closed. If this is not done, some water will flow back into the sewage pump tank, causing wastewater to circulate. A valve allows for manual closure of the exhaust pipe during maintenance or other necessary procedures, facilitating repairs. The valve is normally open when backwashing the sewage pump tank with water from the exhaust pipe.

[0015] Furthermore, the check valve is located outside the sewage lifting tank.

[0016] It can prevent the check valve from contacting sewage, facilitate the inspection and maintenance of the check valve and extend the service life of the check valve.

[0017] Furthermore, there are two sewage pumps, two outlet pipes, two check valves and two coupling devices, and the ends of the two outlet pipes away from the coupling device are combined into a main water pipe, which is connected to the municipal pipe network. Beneficial effects

[0018] This pumping station is equipped with an exhaust pipe. Some of the water pumped out by the sewage pump flows back to the sewage lifting tank through the exhaust pipe, flushing the dirt at the bottom of the sewage lifting tank. The flushed dirt is sucked up by the sewage pump and eventually discharged to the municipal pipe network. It can stir the liquid in the sewage lifting tank, allowing a small amount of floating debris to mix with the water and be sucked up by the sewage pump, and finally discharged to the municipal pipe network.

[0019] This pumping station is equipped with an exhaust pipe, which can discharge the sucked air from the exhaust pipe when the sewage pump is idling, avoiding air suffocation in the volute of the sewage pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a sectional view of the side view of the device;

[0021] Figure 2 is a front view of the device;

[0022] Figure 3 This is the state diagram of the float level switch during the rising process of the float;

[0023] Figure 4 This is the state diagram of the float level switch during the floating ball descending process.

[0024] 1. Sewage lifting tank; 2. Top bracket; 3. Slide rail; 4. Connecting piece; 5. Coupling base; 6. Sewage pump; 7. Outlet pipe; 8. Check valve; 9. Exhaust pipe; 10. Valve; DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] See Figure 1 and Figure 2 The sewage lifting pump station with backwashing device includes a sewage lifting tank 1, the upper left end of the sewage lifting tank 1 is its water inlet, and the lower right end of the sewage lifting tank 1 is its drain outlet.

[0027] The sewage lift tank 1 is equipped with a coupling device. In this embodiment, there are two coupling devices. Each coupling device's inlet is connected to a sewage pump 6, and its outlet is connected to a pipeline assembly. Since there are two coupling devices in this embodiment, both the sewage pump 6 and the pipeline assembly are two. The coupling device is currently available and can be purchased directly.

[0028] The coupling device includes:

[0029] The top bracket 2 is mounted on the inner wall of the sewage lifting tank 1 by bolts.

[0030] The slide rail 3 is fixed on the top bracket 2, and the length direction of the slide rail 3 is arranged vertically.

[0031] The connecting piece 4 is slidably mounted on the slide rail 3 and can slide along the length direction of the slide rail 3. The sewage pump 6 is fixedly connected to the connecting piece 4, and the sewage pump 6 and the connecting piece 4 slide along the slide rail 3 as a whole.

[0032] The coupling base 5 is fixed to the lower end of the slide rail 3, and the coupling base 5 can be installed on the inner bottom surface of the sewage lifting tank 1 by bolts. When the connecting piece 4 and the sewage pump 6 move as a whole, and when the connecting piece 4 is snapped onto the coupling base 5, the outlet end of the sewage pump 6 fits tightly with the inlet end of the coupling base 5. At this time, the lower end of the sewage pump 6 is placed on the inner bottom surface of the sewage lifting tank 1, ensuring that the outlet end of the sewage pump 6 is stably connected to the inlet end of the coupling base 5. Although the sewage pump 6 is not directly and firmly connected to the coupling base 5, relying on the close fit, it can ensure that when the sewage pump 6 pumps sewage, the sewage reaches the outlet end of the sewage pump 6 from the inlet end of the sewage pump 6, and the sewage enters the inlet end of the coupling base 5 through the outlet end of the sewage pump 6, and is finally discharged from the outlet end of the coupling base 5.

[0033] When inspecting the sewage pump 6, it is only necessary to lift the sewage pump 6 upwards to separate the sewage pump 6 and the connecting piece 4 from the coupling base 5 as a whole. The connecting piece 4 and the sewage pump 6 move as a whole along the slide rail 3 and are raised to a height at which the maintenance personnel can inspect and repair the sewage pump 6. Because the sewage pump 6 is not directly and firmly connected to the coupling base 5, it is convenient to lift the sewage pump 6 and facilitate inspection and maintenance.

[0034] The piping assembly includes:

[0035] In this embodiment, the outlet pipe 7 is vertically arranged. The lower end of the outlet pipe 7 is connected to the outlet pipe of the coupling base 5 via a flange; the upper end of the outlet pipe 7 passes through the sewage lifting tank 1. The outlet pipes 7 of the two pipeline assemblies are installed together to form a main water pipe, which is connected to the municipal pipeline network. The water from the two outlet pipes 7 is combined in the main water pipe and ultimately flows to the municipal pipeline network.

[0036] The check valve 8 is fixedly installed on the water outlet pipe 7. Figure 1 From a different perspective, the check valve 8 is used to ensure that the water in the outlet pipe 7 can only flow from the lower end of the outlet pipe 7 to the upper end of the outlet pipe 7, and cannot flow from the upper end of the outlet pipe 7 to the lower end of the outlet pipe 7. In this embodiment, the check valve 8 is located outside the sewage lifting tank 1, so that the check valve 8 has no contact with the sewage, which has the advantages of convenient maintenance and extended service life.

[0037] The above are all existing technologies. The design of this solution is that the side of the water outlet pipe 7 is fixedly connected to the exhaust pipe 9. In this embodiment, the upper end of the exhaust pipe 9 is connected to the water outlet pipe 7, and the lower end of the exhaust pipe 9 faces the inner bottom wall of the sewage lifting tank 1. Because dirt easily accumulates on the inner bottom wall of the sewage lifting tank 1, the lower end of the exhaust pipe 9 faces the inner bottom wall of the sewage lifting tank 1. The water flowing out of the exhaust pipe 9 is used to flush the inner bottom wall of the sewage lifting tank 1, which has a better flushing effect on the dirt and prevents the dirt from accumulating on the inner bottom wall of the sewage lifting tank 1. The flushed dirt will be captured by the sewage pump 6 and eventually discharged into the municipal pipe network. In addition, the water flowing out of the exhaust pipe 9 will stir the water in the sewage lifting tank 1, allowing floating objects on the water surface in the sewage lifting tank 1 to mix into the water body and can also be captured by the sewage pump 6 and discharged from the sewage lifting tank 1 together, and eventually enter the municipal pipe network.

[0038] In this embodiment, the inner diameter of the exhaust pipe 9 is smaller than that of the outlet pipe 7. According to Bernoulli's principle, assuming the inner diameter of the exhaust pipe 9 is equal to that of the outlet pipe 7, the water flow rate in the exhaust pipe 9 is set to A. In this embodiment, the inner diameter of the exhaust pipe 9 is smaller than that of the outlet pipe 7, and the water flow rate in the exhaust pipe 9 is set to B. Therefore, B is greater than A. A faster flow rate effectively flushes dirt from the inner bottom wall of the sewage lifting tank 1.

[0039] Valve 10 is installed on exhaust pipe 9, but it is normally open. During non-maintenance periods, valve 10 remains open, allowing water flowing from exhaust pipe 9 to flush waste from sewage lift tank 1 and mix floating debris into the water, allowing sewage pump 6 to capture and discharge it from the sewage lift tank. When the sewage pump needs to be repaired, valve 10 is manually closed to prevent sewage from escaping from the sewage lift tank while the pump is being repaired.

[0040] The use process of this sewage lifting pump station

[0041] The float liquid level switch placed in the sewage lifting tank 1 serves as a component for controlling the on-off circuit of the sewage pump 6, thereby controlling the start and stop of the sewage pump 6. The float liquid level switch is a prior art.

[0042] See Figure 3 , the float of the float level switch floats on the liquid surface in the sewage lifting tank 1, and rises and falls with the rise and fall of the liquid level in the sewage lifting tank 1. Assume that the liquid level in the sewage lifting tank 1 is initially at the low threshold (i.e. Figure 1 As sewage continues to flow into the sewage lift tank 1, the water level therein rises. When the liquid level in the sewage lift tank 1 is at the low threshold, the metal block in the float does not fall to the bottom of the float, and the metal block does not connect to the circuit of the sewage pump 6. When the liquid level in the sewage lift tank 1 gradually rises to the high threshold, the metal block in the float eventually falls to the bottom of the float due to its own weight, and the metal block connects to the circuit of the sewage pump 6, causing the sewage pump 6 to start pumping water.

[0043] See Figure 4 After sewage pump 6 pumps water, the liquid level in sewage lift tank 1 gradually drops from the high threshold. Initially, the metal block in the float remains at the bottom of the float due to its own weight, so the metal block in the float remains connected to the circuit of sewage pump 6, and sewage pump 6 continues to operate. However, as the liquid level in sewage lift tank 1 continues to drop, the metal block in the float eventually breaks away from the bottom of the float, disconnecting the circuit of sewage pump 6 and causing sewage pump 6 to stop pumping. After sewage pump 6 stops pumping, the water level in sewage lift tank 1 is at the low threshold.

[0044] During the pumping process, the sewage pump 6 draws sewage into the inlet end of the coupling base 5, and the sewage then reaches the lower end of the outlet pipe 7 from the outlet end of the coupling base 5. At this time, a portion of the sewage water flows out from the lower end of the outlet pipe 7 to the upper end of the outlet pipe 7, and finally enters the municipal pipe network; another portion of the sewage water flows from the lower end of the outlet pipe 7 to the exhaust pipe 9, and flows out from the end of the exhaust pipe 9 away from the outlet pipe 7. This portion of sewage water flushes the sewage, loosening the sewage from the bottom wall of the sewage lifting tank 1. The loosened sewage can be sucked into the sewage pump 6 and finally discharged into the municipal pipe network.

[0045] When the liquid level in sewage lift tank 1 drops to the low threshold, the metal block in the float detaches from the lower end of the float, disconnecting the circuit of sewage pump 6 and causing it to stop. At this point, the liquid level in sewage lift tank 1 is at the low threshold, below the volute of sewage pump 6. If the float level switch were to fail, sewage pump 6 would not be able to stop immediately. Air drawn in by idling sewage pump 6 can be discharged through the normally open exhaust pipe 9, preventing air suffocation in sewage pump 6.

[0046] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A sewage lifting pump station with a backwash device, comprising a sewage lifting tank (1), a sewage pump (6), a coupling device, an outlet pipe (7) and a check valve (8), characterized in that: An exhaust pipe (9) is installed on the water outlet pipe (7), one end of the exhaust pipe (9) is in communication with the water outlet pipe (7), and the other end is located in the sewage lifting tank (1), with the end of the exhaust pipe (9) facing the inner wall of the sewage lifting tank (1).

2. The sewage lifting pump station with backwashing device according to claim 1, characterized in that: One end of the exhaust pipe (9) away from the water outlet pipe (7) faces the inner bottom wall of the sewage lifting tank (1).

3. The sewage lifting pump station with backwashing device according to claim 1, characterized in that: The inner diameter of the exhaust pipe (9) is smaller than the inner diameter of the water outlet pipe (7).

4. The sewage lifting pump station with backwashing device according to claim 1, characterized in that: A valve (10) is installed on the exhaust pipe (9), and the valve (10) is normally open.

5. The sewage lifting pump station with backwashing device according to claim 1, characterized in that: The check valve (8) is located outside the sewage lifting tank (1).

6. The sewage lifting pump station with backwashing device according to claim 1, characterized in that: The sewage pump (6), the outlet pipe (7), the check valve (8) and the coupling device are all two in number. The two outlet pipes (7) are combined into a main water pipe at one end away from the coupling device, and the main water pipe is connected to the municipal pipe network.

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