Self-cleaning COD (Chemical Oxygen Demand) detection device

Abstract

The utility model relates to the field of underground water detection, in particular to a self-cleaning COD (Chemical Oxygen Demand) detection device. The device comprises a shell, a cavity made of a quartz material is arranged in the shell, a piston is arranged in the cavity, the piston is driven by a stepping motor to move up and down along the inner wall of the cavity to clean the inner wall of the cavity, and a light source with the wavelength of 254 nm reaches a photosensitive sensor after passing through detected liquid. The photosensitive sensor receives the attenuated light and converts optical signals into electric signals to be output. The piston is arranged, so that the inner wall can be automatically cleaned, manual cleaning is not needed, and the device can be put into a target water body for detection.

Description

Technical Field

[0001] The utility model relates to the field of groundwater detection, in particular to a self-cleaning COD detection device. Background Art

[0002] COD testing equipment is often used when testing groundwater. Existing testing equipment requires regular manual cleaning of the test bottle, because the inner wall of the test bottle will have attachments after long-term use. The attachments on the inner wall of the test bottle will affect the passage of light, resulting in inaccurate test results. Therefore, providing a testing device that can automatically clean the inner wall is a technical problem to be solved. Utility Model Content

[0003] The purpose of the utility model is to provide a self-cleaning COD detection device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a self-cleaning COD detection device, comprising a shell, a stepper motor is provided at the lower end of the shell, a chamber is provided at the upper end of the shell, a water pipe is provided at the top of the shell, the water pipe is connected to the chamber, a light source and a photosensitive sensor are also provided on the outside of the chamber, the light source and the photosensitive sensor are symmetrically arranged relative to the central axis of the chamber, a piston is also provided in the chamber, the stepper motor is connected to the piston through a screw rod, and the piston can slide up and down along the inner wall of the chamber.

[0005] Preferably, the chamber is made of quartz with high light transmittance.

[0006] Preferably, a plurality of corrugated protrusions are provided in the contact area between the piston and the inner wall of the chamber.

[0007] Preferably, the cross section of the piston is slightly larger than the cross section of the inner wall of the chamber.

[0008] Preferably, the wavelength of the light emitted by the light source is 254 nm.

[0009] Beneficial effects of the utility model: The utility model provides a self-cleaning COD detection device, by arranging a piston in the detection chamber, the piston is tightly fitted with the inner wall of the chamber, and the stepper motor drives the piston to slide up and down along the inner wall of the chamber through the screw rod. In this process, the attachments on the inner wall of the chamber are cleaned, and then pure water is sucked in through the water pipe, and the attachments are discharged from the chamber 2 by the pure water. This design does not require manual cleaning and solves the problems raised in the background technology. Since the shell is in a sealed state, only the water pipe 21 is connected to the outside, and the device can also be put into the target water body for detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0011] Figure 1 It is a schematic diagram of the utility model.

[0012] In the figure: 1. Shell; 2. Chamber; 21. Water pipe; 22. Piston; 3. Light source; 4. Photosensitive sensor; 5. Stepper motor; 51. Screw. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] like Figure 1As shown, a self-cleaning COD detection device includes a housing 1, a chamber 2 is arranged in the upper part of the housing 1, a stepper motor 5 is arranged in the lower part of the housing 1, the chamber 2 is made of quartz with high light transmittance, a piston 22 is arranged inside the chamber 2, the piston 22 is connected to the output end of the stepper motor 5 through a screw 51, the stepper motor 5 is powered on to drive the screw 51 to rotate slowly, the corresponding part of the screw 51 within the height of the piston 2 sliding up and down has a thread, and the piston 22 and the screw 51 are connected through the thread; the screw 51 is cylindrical near the bottom wall of the chamber 2, and a cylindrical through hole is opened on the bottom wall of the chamber 2, and the cylindrical through hole is rotated and matched with the cylindrical part of the screw 51 and connected through a sealing component, and this design is to make the screw 51 and the bottom wall of the chamber 2 better sealed. The stepper motor 5 drives the piston 22 to slide up and down along the inner wall of the chamber 2 through the screw 51, and the speed of the stepper motor 5 is slowed down, so that the piston 22 can fully contact with the inner wall of the chamber 2, and the attachments on the inner wall of the chamber 2 can be removed more thoroughly. The water pipe 21 passes through the chamber 2 and the shell 1 in a sealed manner. The upper end of the water pipe 21 is communicated with the outside of the shell 1 , and the lower end of the water pipe 21 is communicated with the chamber 2 .

[0016] When the inner wall of the chamber 2 needs to be cleaned, the stepper motor 5 is started to drive the piston 22 to move up and down several times, and the upper end of the piston 22 is close to the top wall of the chamber 2. At this time, the water pipe 21 contacts the pure water, and the stepper motor 5 drives the piston 22 to move downward. A negative pressure chamber is formed on the upper part of the piston 22, and the pure water enters the chamber 2 from the water pipe 21. The piston 22 then moves upward from the bottom of the chamber 2, and the inhaled pure water is discharged through the water pipe 21. The attachments on the inner wall of the chamber 2 will also be discharged with the pure water. If the flushing is not thorough once, the operation can be repeated for several times until the cleanliness of the chamber 2 reaches the detection standard. In the process of the piston 22 moving up and down along the inner wall of the chamber 2, the piston 22 has a multiple cleaning effect on the inner wall of the chamber 2. Preferably, a plurality of corrugated protrusions can be set at the contact part between the piston 22 and the inner wall of the chamber 2 to better remove the debris attached to the inner wall. Or the cross section of the piston 22 is slightly larger than the cross section of the inner wall of the chamber 2, so that the mutual squeezing force between the piston 22 and the inner wall of the chamber 2 is greater, and the cleaning effect is also better.

[0017] When the inner wall of the chamber 2 is clean and free of debris, the piston 22 first moves upward to the top wall of the chamber 2, and the upper end of the water pipe 21 contacts the liquid to be detected. The stepper motor 5 drives the piston 22 to move downward, and the liquid to be detected is sucked into the chamber 2 through the water pipe 21.

[0018] Since the material of the chamber 2 is quartz with high light transmittance, a light source 3 and a photosensor 4 are provided on both sides of the axis of the chamber 2 symmetrically. The light source 3 emits light with a wavelength of 254nm. The light emitted by the light source 3 passes through the liquid to be detected in the chamber 2 and reaches the photosensor 4. The photosensor 4 receives the light after attenuation by the detection liquid, converts the optical signal into an electrical signal and outputs a corresponding voltage value.

Claims

1. A self-cleaning COD detection device, comprising a housing (1), a stepping motor (5) is provided at the lower end of the housing (1), a chamber (2) is provided at the upper end of the housing (1), a water pipe (21) is provided at the top end of the housing (1), the water pipe (21) is communicated with the chamber (2), a light source (3) and a photosensitive sensor (4) are further provided outside the chamber (2), the light source (3) and the photosensitive sensor (4) are symmetrically arranged relative to the central axis of the chamber (2), and characterized in that: A piston (22) is also provided in the chamber (2). The stepping motor (5) is connected to the piston (22) via a screw rod (51). The piston (22) can slide up and down along the inner wall of the chamber (2).

2. A self-cleaning COD detection device according to claim 1, characterized in that: The material of the chamber (2) is quartz with high light transmittance.

3. A self-cleaning COD detection device according to claim 1, characterized in that: A plurality of corrugated protrusions are provided in the contact area between the piston (22) and the inner wall of the chamber (2).

4. A self-cleaning COD detection device according to claim 1 or 3, characterized in that: The cross section of the piston (22) is slightly larger than the cross section of the inner wall of the chamber (2).

5. A self-cleaning COD detection device according to claim 4, characterized in that: The wavelength of the light emitted by the light source (3) is 254 nm.

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