Sewage sampling device
By designing a wastewater sampling device with negative pressure suction and filter filtration, the problem of pump blockage in the influent channel of the wastewater treatment plant was solved, enabling smooth wastewater sampling and reliable operation of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU ENVIRONMENTAL WATER CONSTR CO LTD
- Filing Date
- 2025-04-27
- Publication Date
- 2026-06-19
AI Technical Summary
Existing wastewater sampling devices are prone to causing pump blockage during sampling, especially in the influent channels of wastewater treatment plants, where impurities such as particulate matter, hair, and grease can easily accumulate, leading to pump blockage.
A wastewater sampling device was designed, comprising a shell, a water intake pipe, a liquid level controller, a vacuum pump, a self-priming water pump, a filter, a water delivery pipe, and an air inlet pipe. The device reduces the amount of impurities entering the self-priming water pump through negative pressure suction and filtration. It also incorporates pressure and vacuum sensors for real-time monitoring and alarm functions to ensure the normal operation of the device.
It effectively reduces the clogging of self-priming water pumps, ensures the smooth progress of the sampling process, improves the reliability and cleaning efficiency of the sampling device, and avoids the problem of pump blockage.
Smart Images
Figure CN224382878U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater sampling technology, specifically to a wastewater sampling device. Background Technology
[0002] Wastewater influent sampling points are crucial for monitoring influent water quality. Regularly collecting and analyzing these samples allows for timely understanding of the concentration and chemical composition of pollutants. The analysis results provide insights into the dynamics of the pipe network, the water quality within the wastewater treatment plant's catchment area, and inform adjustments to the plant's production processes.
[0003] According to the relevant technical regulations for urban wastewater treatment plants and the relevant specifications for urban and rural drainage engineering projects, the water quality monitoring points and laboratory sampling points for the influent of wastewater treatment plants should be set at the main inlet, and should avoid the influence of wastewater discharged into the plant. It is advisable to set them at 1m underwater in front of the coarse screen.
[0004] If the influent sampling point is located after the coarse screen, the collected water sample data will be mixed with sewage discharged from the plant area, which will lead to discrepancies between the monitoring data and the actual water quality. If the influent sampling point is located before the coarse screen, the influent channel is connected to the municipal sewage network and is located deep underground in a confined space. The underwater impact is significant, the environment is complex, and there is a large amount of debris. Particulate matter, hair fibers, and grease in the sewage can easily cause blockages in pipes, filters, and pumps.
[0005] Specifically, urban sewage contains various solid particles, such as sand and gravel. These particles easily accumulate in the pump impeller and casing, eventually clogging the pump. Sewage also contains a lot of hair and fibrous materials, which easily become entangled on the pump impeller and are difficult to clean. Grease in sewage also easily solidifies on the pump impeller and casing, forming hard clumps that further clog the pump.
[0006] Therefore, there is an urgent need for a wastewater sampling device that reduces pump blockage. Utility Model Content
[0007] The purpose of this invention is to provide a wastewater sampling device that aims to improve the problem of pump blockage that easily occurs when sampling wastewater in the prior art.
[0008] To achieve the above objectives, this utility model provides the following technical solution:
[0009] A wastewater sampling device includes a housing, a water intake pipe, a level controller, a vacuum pump, a water delivery pipe, a filter, a self-priming water pump, a water supply pipe, an air inlet pipe, and an air inlet valve. The water intake pipe passes through the housing, with its upper end located inside the housing and its lower end extending below the housing. The vacuum pump and the self-priming water pump are both located inside the housing. The vacuum pump is connected to the upper part of the water intake pipe. The level controller is located inside the water intake pipe and is electrically connected to the vacuum pump. The section of the water intake pipe below the level controller is connected to the water delivery pipe. The end of the water delivery pipe away from the water intake pipe is connected to the pump inlet of the self-priming water pump. The pump outlet of the self-priming water pump is connected to one end of the water delivery pipe, and the other end of the water delivery pipe extends outside the housing. The filter is located on the water intake pipe. The section of the water delivery pipe between the filter and the self-priming water pump is connected to the air inlet pipe. The air inlet valve is located on the air inlet pipe, and a water delivery valve is located on the water delivery pipe.
[0010] Furthermore, a drain pipe is connected to the water supply pipe section between the filter and the self-priming water pump. The end of the drain pipe away from the water supply pipe is connected to the water intake pipe, and a drain valve is installed on the drain pipe.
[0011] Furthermore, a pressure sensor is installed on the water delivery pipe.
[0012] Furthermore, the upper end of the water intake pipe is sealed, and a vacuum sensor is installed on the upper part of the water intake pipe, the vacuum sensor being electrically connected to an alarm device.
[0013] Furthermore, the pressure sensor is electrically connected to an alarm device.
[0014] Furthermore, the filter employs a two-stage filter.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] In this invention, the wastewater sampling device is installed at the main inlet of the wastewater treatment plant, with the lower end of the intake pipe extending below the wastewater before the coarse screen. The air inlet valve and water delivery valve are closed, and a vacuum pump is started to draw air into the intake pipe, creating a negative pressure environment. Under this negative pressure, the wastewater is lifted into the intake pipe. When the wastewater level reaches the level controller, the wastewater triggers the controller's signal, causing the vacuum pump to shut down. At this point, the water level in the intake pipe stops rising. The water delivery valve is then opened, allowing the wastewater in the intake pipe to continuously flow into the delivery pipe. A self-priming water pump is started, and the wastewater in the delivery pipe, after being filtered by a filter, is transported by the self-priming water pump through the delivery pipe to the online monitoring room for testing and treatment. Particulate matter, hair, and fibrous materials are difficult to detect. The air entering the self-priming water pump reduces the risk of blockages. After sampling, the vacuum pump and self-priming water pump are shut off, and the air inlet valve is opened. Outside air enters the water delivery pipe through the air inlet pipe. Due to the negative pressure in the upper part of the water intake pipe, the sewage in the water delivery pipe is forced into the water intake pipe under atmospheric pressure. However, the negative pressure in the water intake pipe only allows the sewage to be lifted to a specified height. When the sewage in the water delivery pipe flows into the water intake pipe, the sewage in the water intake pipe moves downward under gravity, causing excess sewage to be discharged from the water intake pipe. During this process, outside air cleans the residual sewage and impurities in the water delivery pipe through the air inlet pipe and the water delivery pipe, which helps to remove most of the debris in the water delivery pipe and reduces blockages. Attached Figure Description
[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] Figure 2 For the purposes of this utility model Figure 1 The partial structural cross-sectional view of AA is intended to show the internal structure of the shell.
[0020] The attached diagram shows the markings and corresponding component names:
[0021] 1. Housing; 2. Water intake pipe; 3. Liquid level controller; 4. Vacuum pump; 5. Water supply pipe; 6. Filter; 7. Self-priming water pump; 8. Water delivery pipe; 9. Air inlet pipe; 10. Air inlet valve; 11. Water supply valve; 12. Drain pipe; 13. Drain valve; 14. Pressure sensor; 15. Vacuum sensor. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Example 1
[0024] A wastewater sampling device, referring to Figure 1 , Figure 2 The system includes a housing 1, a water intake pipe 2, a level controller 3, a vacuum pump 4, a water delivery pipe 5, a filter 6, a self-priming water pump 7, a water delivery pipe 8, an air inlet pipe 9, and an air inlet valve 10. The water intake pipe 2 is vertically installed on the bottom wall of the housing 1, with its upper end inside the housing 1 and its lower end extending below the housing 1. Both the vacuum pump 4 and the self-priming water pump 7 are located inside the housing 1. The suction end of the vacuum pump 4 is connected to the upper part of the water intake pipe 2 through a suction pipe. The level controller 3 is located inside the water intake pipe 2 and is connected to the vacuum pump 7. The empty pump 4 is electrically connected. The section of the water intake pipe 2 below the liquid level controller 3 is connected to the water supply pipe 5. The end of the water supply pipe 5 away from the water intake pipe 2 is connected to the pump inlet end of the self-priming water pump 7. The pump outlet end of the self-priming water pump 7 is connected to one end of the water delivery pipe 8. The other end of the water delivery pipe 8 extends to the outside of the housing 1. The filter 6 is installed on the water intake pipe 2. The section of the water supply pipe 5 between the filter 6 and the self-priming water pump 7 is connected to the air inlet pipe 9. The air inlet valve 10 is installed on the air inlet pipe 9. The water delivery pipe 5 is equipped with a water delivery valve 11.
[0025] The liquid level controller 3 can be of various types, such as float-type, radar-type, and ultrasonic-type. The liquid level controller 3 automatically controls the start and stop of the vacuum pump 4 by monitoring the liquid level in real time and combining this with the logic judgment of the control unit. For the float-type liquid level controller 3, the characteristic of the float rising and falling with the liquid level, or by triggering a reed switch through magnetic induction, outputs a liquid level status signal. For example, when the liquid level is full, the float switch closes, and the signal is transmitted to the control unit.
[0026] Regarding the control logic and execution of the control unit: Direct relay control can be selected. The liquid level sensor signal directly drives the contacts (normally open / normally closed) of the liquid level relay, and controls the power supply of vacuum pump 4 through an AC contactor. For example, when the liquid level reaches the high limit, the normally closed contact of the relay opens, cutting off the power supply of vacuum pump 4; when the liquid level is lower than the low limit, the contact closes to restart vacuum pump 4.
[0027] The liquid level controller 3 and the control logic method described above are common technical knowledge in the field, and will not be described again in this embodiment.
[0028] In this scheme, the wastewater sampling device is installed at the main inlet of the wastewater treatment plant, with the lower end of the intake pipe 2 extending below the wastewater in front of the coarse screen. The vacuum pump 4 is activated to draw air from the intake pipe 2, creating a negative pressure state. Under this negative pressure, the wastewater is lifted into the intake pipe 2. When the wastewater level reaches the level controller 3, the wastewater triggers the control signal of the level controller 3, which then shuts off the vacuum pump 4. At this point, the water level in the intake pipe 2 stops rising, and the wastewater continues to flow into the delivery pipe 5. The self-priming pump 7 is then activated. The wastewater in the delivery pipe 5, after being filtered by the filter 6, is then transported by the self-priming pump 7 through the delivery pipe 8 to the online monitoring room for testing and treatment. Particulate matter, hair, and fibrous materials are difficult to enter the self-priming pump 7. This reduces the likelihood of blockages inside the self-priming water pump 7. After sampling, the vacuum pump 4 and the self-priming water pump 7 are turned off, and the air inlet valve 10 is opened. Outside air enters the water delivery pipe 5 through the air inlet pipe 9. Due to the negative pressure in the upper part of the water intake pipe 2, the sewage in the water delivery pipe 5 is squeezed into the water intake pipe 2 under atmospheric pressure. However, due to the negative pressure in the water intake pipe 2, the sewage can only be lifted to a specified height. When the sewage in the water delivery pipe 5 flows into the water intake pipe 2, the sewage in the water intake pipe 2 moves downward under gravity, causing the excess sewage to be discharged from the water intake pipe 2. During this process, outside air cleans the sewage and impurities remaining in the water delivery pipe 5 through the air inlet pipe 9 and the water delivery pipe 5 in reverse, which helps to clean most of the debris in the water delivery pipe 5 and reduces blockages in the water delivery pipe 5.
[0029] Among them, filter 6 is a two-stage filter 6, which refers to a filtration system formed by two independent filter units connected in series, mainly used to improve filtration efficiency and accuracy. It should be noted that both filter units of the two-stage filter 6 can be coarse filters 6. The coarse filters 6 are mainly used to filter larger particles (silt, rust, suspended solids), hair, fibrous materials and other impurities in the water. They are only used to prevent the self-priming water pump 7 from clogging, and are not used for sewage purification, because the sewage sampled by the sewage sampling device still needs to be transported to the online monitoring room for water quality monitoring.
[0030] Example 2
[0031] Based on Example 1, in this example, refer to Figure 1 , Figure 2A drain pipe 12 is connected to the water supply pipe 5 section between the filter 6 and the self-priming water pump 7. The end of the drain pipe 12 away from the water supply pipe 5 is connected to the water intake pipe 2, and a drain valve 13 is installed on the drain pipe 12. The end of the drain pipe 12 near the water supply pipe 5 is higher than the end of the drain pipe 12 near the water intake pipe 2. After the pipe of the filter 6 near the water intake pipe 2 is cleaned through the air inlet pipe 9, the drain valve 13 is opened. The sewage remaining in the water supply pipe 5 and the drain pipe 12 is discharged to the water intake pipe 2 under atmospheric pressure. Finally, the excess sewage in the water intake pipe 2 is discharged downwards, which facilitates the discharge of sewage in the water supply pipe 5 and the self-priming water pump 7, reduces the residual sewage in the water supply pipe 5 and the self-priming water pump 7, and reduces the possibility of the sewage from the next water sampling mixing with the sewage from the previous sampling, so as to ensure the authenticity of the next water sampling.
[0032] Example 3
[0033] Based on Example 1, in this example, refer to Figure 1 , Figure 2 A pressure sensor 14 is installed on the water supply pipe 8. The pressure sensor 14 can monitor the water pressure in the water supply pipe 8 in real time. When the water pressure in the water supply pipe 8 is low, it can be determined that there may be a blockage in the water supply pipe 5 or the filter 6, so that the filter 6 can be cleaned in time. The data of the pressure sensor 14 can be displayed on the display screen.
[0034] Furthermore, the pressure sensor 14 is also electrically connected to an alarm device, which can be an audible and visual alarm (not shown in the attached diagram, but is existing technology and can be purchased directly from the market). Timely alarms facilitate timely maintenance and repair of the sampling device by staff.
[0035] The implementation of the audible and visual alarm controlled by pressure sensor 14 requires three core steps: signal acquisition, threshold judgment, and drive control. The 4-20mA analog or voltage signal output by pressure sensor 14 needs to be converted into a digital signal by an ADC module (such as the ADC1 of an STM32) for the controller to process. A digital display controller or embedded system (such as an STM32) receives the signal from pressure sensor 14 and presets the alarm threshold. A comparator or software algorithm determines whether the threshold (lower limit) has been exceeded, triggering the logic control signal. The controller outputs switching signals (high / low level) via GPIO to drive an NPN transistor or relay, controlling the power supply to the audible and visual alarm. After the alarm is activated, the built-in loudspeaker and LED light source simultaneously emit an audible and visual warning.
[0036] Example 4
[0037] Based on Example 3, in this example, refer to Figure 1 , Figure 2The upper end of the water intake pipe 2 is sealed, and a vacuum sensor 15 is installed on the upper part of the water intake pipe 2. The vacuum sensor 15 is electrically connected to an alarm device. The alarm device can be an audible and visual alarm.
[0038] In this solution, the vacuum sensor 15 is also a pressure sensor 14. Its connection to the audible and visual alarm and the corresponding control method are conventional techniques in this field and will not be elaborated upon in this embodiment. To maintain the water level in the water intake pipe 2 at a certain height, the negative pressure inside the water intake pipe 2 must be within a certain range. If the air pressure inside the water intake pipe 2 is too high, the water level will not reach the predetermined height, making it difficult to transport the water to the water delivery pipe 5. If the air pressure is too low, the water level will easily become too high, causing sewage to enter the vacuum pump 4 and affecting its normal operation. Therefore, the vacuum sensor 15 is used to detect the air pressure inside the water intake pipe 2. When the air pressure is outside the normal range, an alarm is triggered, facilitating timely maintenance of the sampling device by staff.
[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A wastewater sampling device, characterized in that: The system includes a housing (1), a water intake pipe (2), a liquid level controller (3), a vacuum pump (4), a water delivery pipe (5), a filter (6), a self-priming water pump (7), a water delivery pipe (8), an air inlet pipe (9), and an air inlet valve (10). The water intake pipe (2) is installed on the housing (1), with its upper end located inside the housing (1) and its lower end extending below the housing (1). The vacuum pump (4) and the self-priming water pump (7) are both located inside the housing (1). The vacuum pump (4) is connected to the upper part of the water intake pipe (2), and the liquid level controller (3) is located inside the water intake pipe (2) and electrically connected to the vacuum pump (4). The section of the water intake pipe (2) below the liquid level controller (3) is connected to the water delivery pipe (5). The end of the water delivery pipe (5) away from the water intake pipe (2) is connected to the pump inlet of the self-priming water pump (7). The pump outlet of the self-priming water pump (7) is connected to one end of the water delivery pipe (8). The other end of the water delivery pipe (8) extends to the outside of the housing (1). The filter (6) is installed on the water intake pipe (2). The section of the water delivery pipe (5) between the filter (6) and the self-priming water pump (7) is connected to the air inlet pipe (9). The air inlet valve (10) is installed on the air inlet pipe (9). The water delivery pipe (5) is equipped with a water delivery valve (11).
2. The wastewater sampling device according to claim 1, characterized in that: A drain pipe (12) is connected to the water supply pipe (5) between the filter (6) and the self-priming water pump (7). The end of the drain pipe (12) away from the water supply pipe (5) is connected to the water intake pipe (2). A drain valve (13) is provided on the drain pipe (12).
3. The wastewater sampling device according to claim 1, characterized in that: A pressure sensor (14) is installed on the water delivery pipe (8).
4. The wastewater sampling device according to claim 1, characterized in that: The upper end of the water intake pipe (2) is sealed, and a vacuum sensor (15) is installed on the upper part of the water intake pipe (2). The vacuum sensor (15) is electrically connected to an alarm device.
5. The wastewater sampling device according to claim 3, characterized in that: The pressure sensor (14) is electrically connected to an alarm device.
6. The wastewater sampling device according to claim 1, characterized in that: The filter (6) is a two-stage filter (6).