Sewage sampler

Abstract

A control circuit and a water pumping peristaltic pump are arranged in a shell, a water flow sensor is arranged outside the shell and electrically connected with the control circuit, a countersunk head connected with the water pumping peristaltic pump through a water pipe is arranged outside the shell, and the water flow sensor is arranged on the countersunk head; the control circuit comprises a main control circuit, a power supply module, an external signal transmission port and a timing module; the power module is connected with the master control circuit to supply power to the whole device, the external signal transmission port is connected with a motor in the water pumping peristaltic pump and the water flow sensor and linearly controls the water pumping rate of the water pumping peristaltic pump, and the timing module is connected with the power module to control the starting time of the whole device. According to the invention, the problem of'sewage bag 'omission caused by incapability of continuously pumping sewage in time by the existing like products can be solved; meanwhile, the problem that sampling is carried out for a long time due to the fact that the device cannot be hidden under the sewage well lid is solved through miniaturization, low power consumption and reduction of mechanical structures, and therefore the requirement for secret sampling of policemen is met.

Description

Technical Field

[0001] This invention relates to the field of wastewater sampler technology, specifically to a miniature police wastewater sampler. Background Technology

[0002] The detection of drugs and their metabolites in wastewater is a new technology introduced by domestic anti-drug departments in recent years. One important purpose is to accurately understand the drug situation in time and space by monitoring the drugs and metabolites in wastewater of target watersheds or buildings, and to trace and combat drug use and trafficking. If sampling is required for tracing the source and accurately understanding the drug situation at the main outlet of a wastewater pipe network in a specific area, or at the wastewater outlet of a key location, then to avoid missing individual wastewater packets during the sampling process, truly uninterrupted continuous sampling (or high-frequency sampling) must be used. At the same time, to enhance the representativeness of the samples, the sampling rate must be linearly proportional to the water flow rate at the sampling node.

[0003] In addition, due to the need for secrecy in drug control work and the long sampling time, the equipment needs to be small enough to be suspended below the level of the sewage well cover, and the long working time requires low power consumption, that is, the motor power is small enough and easy to adjust and control, and the mechanical parts should be minimized.

[0004] Currently available domestic sampling equipment all employs discrete sampling, with sewage sampling pumps operating at relatively high flow rates, mostly a few milliliters per second. This not only results in high current consumption (above 1A), making battery use inconvenient, but also limits the capacity of the sample collection container, hindering continuous sampling over extended periods (several days). Consequently, the sampling intervals of commercially available sewage samplers are typically greater than 30 minutes, and the samples collected lack statistical representativeness. Summary of the Invention

[0005] The technical problem to be solved by this invention is that previous products could not continuously sample without interruption; to meet the requirements of low power consumption, small size, easy placement under sewage well covers for long-term operation and easy concealment; and to achieve flow rate ratio control of sampling rate.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: a sewage sampler, including a shell, a control circuit, a peristaltic pump, and a water flow sensor;

[0007] The control circuit and the peristaltic pump are housed inside the housing, while the water flow sensor is located outside the housing and electrically connected to the control circuit. The housing is equipped with a sinker connected to the peristaltic pump via a water pipe, and the water flow sensor is located on the sinker.

[0008] The control circuit includes a main control circuit, a power supply module, an external signal transmission port, and a timing module. The power supply module is connected to the main control circuit to supply power to the entire device. The external signal transmission port is connected to the motor and water flow sensor inside the peristaltic pump and linearly controls the pumping rate of the peristaltic pump. The timing module is connected to the power supply module to control the start-up time of the entire device.

[0009] Furthermore, it also includes a working status indicator light, which is connected to the main control circuit.

[0010] Furthermore, it also includes a stepper motor output terminal, which is connected to the main control circuit and serves as a backup port.

[0011] Furthermore, it also includes a DC motor output terminal, which is connected to the main control circuit and serves as a backup port.

[0012] The advantages of this invention compared to existing technologies are as follows: This invention can solve the problem that existing similar products cannot continuously extract sewage over time, resulting in the omission of "sewage packets"; at the same time, by miniaturizing, reducing power consumption, and reducing mechanical structure, it solves the problem of not being able to be hidden under sewage well covers for a long time to collect samples, thereby meeting the needs of police for covert sampling. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a wastewater sampler according to the present invention.

[0014] Figure 2 This is a system block diagram of a wastewater sampler according to the present invention.

[0015] Figure 3 This is a circuit diagram of a wastewater sampler according to the present invention.

[0016] As shown in the figure: 1. Outer shell, 2. Peristaltic pump, 3. Water flow sensor, 4. Main control circuit, 5. Power module, 6. External signal transmission port, 7. Working status indicator light, 8. Stepper motor output terminal, 9. DC motor output terminal, 10. Timing module, 11. Countersunk head, 12. Inlet pipe, 13. Outlet pipe. Detailed Implementation

[0017] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] The following is a detailed description of a wastewater sampler according to the present invention, with reference to the accompanying drawings.

[0020] Combined with appendix Figure 1-3 This invention will be described in detail below.

[0021] A wastewater sampler includes a housing 1, a control circuit, a peristaltic pump 2, and a water flow sensor 3. The control circuit and the peristaltic pump 2 are housed inside the housing 1, while the water flow sensor 3 is located outside the housing 1 and electrically connected to the control circuit. A countersunk head 11, connected to the peristaltic pump 2 via a water pipe, is located outside the housing 1, and the water flow sensor 3 is mounted on the countersunk head 11. The control circuit includes a main control circuit 4, a power module 5, an external signal transmission port 6, and a timing module 10. The power module 5 is connected to the main control circuit 4 to supply power to the entire device. The external signal transmission port 6 is connected to the motor inside the peristaltic pump 2 and the water flow sensor 3 and linearly controls the pumping rate of the peristaltic pump 2. The timing module 10 is connected to the power module 5 to control the start-up time of the entire device.

[0022] It also includes a working status indicator light 7, which is connected to the main control circuit 4.

[0023] It also includes a stepper motor output terminal 8, which is connected to the main control circuit 4 and serves as a backup port.

[0024] It also includes a DC motor output terminal 9, which is connected to the main control circuit 4 and serves as a backup port.

[0025] The external signal transmission port 6 includes the main output port of the PWM peristaltic pump motor and the pulse input port of the flow sensor.

[0026] The motor of the peristaltic pump 2 is a miniature DC geared motor or a miniature stepper motor.

[0027] The water pipe includes an inlet pipe 12 and an outlet pipe 13. The inlet pipe 12 is connected to the countersunk head 11 and the peristaltic pump 2. The outlet pipe 13 extends from the peristaltic pump 2 to the outside of the outer casing 1.

[0028] The specific implementation process of the wastewater sampler of the present invention is as follows:

[0029] To achieve the flow rate ratio for the sampling rate, the sampler is equipped with a water flow sensor 3. The pulse signal from the water flow sensor 3, which is submerged below the water surface at the sampling node, is processed by the microprocessor of the main control circuit 4 to linearly control the speed of the micro motor inside the peristaltic pump 2, thereby achieving linear control of the pumping rate. To achieve ideal linear control accuracy, the motor of the peristaltic pump 2 is a micro DC geared motor (operating current approximately 0.1A) or a micro stepper motor (operating current 0.1–0.3A), and the pumping rate is 1–2 ml per minute (less than 10 ml).

[0030] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A wastewater sampler, characterized in that: It includes a housing (1), a control circuit, a peristaltic pump (2), and a water flow sensor (3); The control circuit and the peristaltic pump (2) are located inside the housing (1), and the water flow sensor (3) is located outside the housing (1) and electrically connected to the control circuit. The housing (1) has a countersunk head (11) connected to the peristaltic pump (2) via a water pipe. The water flow sensor (3) is located on the countersunk head (11). The control circuit includes a main control circuit (4), a power supply module (5), an external signal transmission port (6), and a timing module (10). The power supply module (5) is connected to the main control circuit (4) to supply power to the entire device. The external signal transmission port (6) is connected to the motor and water flow sensor (3) inside the peristaltic pump (2) and linearly controls the pumping rate of the peristaltic pump (2). The timing module (10) is connected to the power supply module (5) to control the start-up time of the entire device.

2. The wastewater sampler according to claim 1, characterized in that: It also includes a working status indicator (7), which is connected to the main control circuit (4).

3. A wastewater sampler according to claim 2, characterized in that: It also includes a stepper motor output terminal (8), which is connected to the main control circuit (4) and serves as a spare port.

4. A wastewater sampler according to claim 3, characterized in that: It also includes a DC motor output terminal (9), which is connected to the main control circuit (4) and serves as a backup port.

5. A wastewater sampler according to claim 4, characterized in that: The external signal transmission port (6) includes the main output port of the PWM peristaltic pump motor and the pulse input port of the flow sensor.

6. A wastewater sampler according to claim 5, characterized in that: The motor of the peristaltic pump (2) is a miniature DC geared motor or a miniature stepper motor.

7. A wastewater sampler according to claim 6, characterized in that: The water pipe includes an inlet pipe (12) and an outlet pipe (13). The inlet pipe (12) connects the sinker (11) and the peristaltic pump (2). The outlet pipe (13) extends from the peristaltic pump (2) to the outside of the outer casing (1).

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