Dissolved oxygen sensor with ultrasonic cleaning function

Abstract

The utility model discloses a dissolved oxygen sensor with an ultrasonic cleaning function, and belongs to the technical field of sensors. The device comprises a sensor fixing seat, a sensor membrane head, an outer tube, an ultrasonic fixing tube and an ultrasonic probe, one end of the outer tube is fixedly connected with the sensor fixing seat, and the sensor fixing seat is detachably connected with the sensor membrane head; the side face of the sensor fixing base is connected with the ultrasonic fixing pipe, an ultrasonic probe is arranged at the tail end of the ultrasonic fixing pipe and right faces the sensor membrane head, and a gap is formed between the ultrasonic probe and the sensor membrane head. The ultrasonic probe arranged right opposite to the sensor membrane head emits ultrasonic waves to clean the sensor membrane head, so that the service life of the dissolved oxygen sensor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of dissolved oxygen sensors, in particular to a dissolved oxygen sensor with ultrasonic cleaning function. Background Art

[0002] Dissolved oxygen sensors can help detect the degree of water pollution. However, since dissolved oxygen sensors are used in liquid levels, a lot of dirt and impurities tend to accumulate on the surface of the dissolved oxygen diaphragm over time, resulting in inaccurate measurements and affecting use.

[0003] Currently, most dissolved oxygen sensors on the market do not have a self-cleaning function. Dissolved oxygen sensors with a self-cleaning function mainly use external water pressure cleaning devices and motor-driven scraping brush cleaning devices. The external water pressure cleaning device is easy to affect the dissolved oxygen content of the medium, resulting in inaccurate measurement. In addition, the structure is complex and requires external pressure equipment, which is not easy to operate. The motor-driven scraping brush cleaning device uses a physical contact cleaning on the dissolved oxygen diaphragm by the scraping brush, which can easily damage the oxygen sensitive layer on the dissolved oxygen diaphragm and cause damage. Production is difficult to control and the scrap rate is high. Utility Model Content

[0004] Aiming at the drawbacks of existing self-cleaning dissolved oxygen sensors, the utility model proposes a dissolved oxygen sensor with ultrasonic cleaning, which has a contactless cleaning mechanism and realizes self-cleaning of the sensor through ultrasonic vibration cleaning. It is easy to maintain and adopts a replaceable dissolved oxygen membrane head, which greatly reduces the maintenance cost of the product and improves the usability of the product.

[0005] To achieve the above-mentioned objectives, the utility model provides a dissolved oxygen sensor with ultrasonic cleaning, which includes a sensor fixing base, a sensor membrane head, an outer tube, an ultrasonic fixing tube and an ultrasonic probe; one end of the outer tube is fixedly connected to the sensor fixing base, and the sensor fixing base is detachably connected to the sensor membrane head; the side of the sensor fixing base is connected to the ultrasonic fixing tube, and the end of the ultrasonic fixing tube is provided with an ultrasonic probe, and the ultrasonic probe is directly opposite to the sensor membrane head, and there is a gap between the two.

[0006] Furthermore, the sensor membrane head includes a fixing block connected to the sensor fixing seat, the fixing block is provided with a dissolved oxygen diaphragm, and the dissolved oxygen diaphragm and the fixing block are detachably connected to the sensor fixing seat through the front cover.

[0007] Furthermore, a first sealing ring is provided between the front cover and the dissolved oxygen membrane.

[0008] Furthermore, a circuit board is provided inside the outer tube, and a blue LED laser light source, a red LED reference light source, and a receiving end for receiving optical signals are provided on the circuit board.

[0009] Furthermore, a second sealing ring is provided between the outer tube and the sensor fixing seat.

[0010] Furthermore, the other end of the outer tube is provided with an outlet connector.

[0011] Furthermore, the ultrasonic fixing tube is in an inverted "C" shape.

[0012] Furthermore, the midpoints of the ultrasonic probe and the sensor membrane head are located on the same vertical line.

[0013] Furthermore, the ultrasonic fixing tube is a hollow structure, and a wire connecting the ultrasonic probe and the circuit board is provided inside the tube.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The utility model adopts an ultrasonic cleaning mechanism, which uses ultrasonic vibration to vibrate the liquid to generate acceleration, thereby impacting the dirt and impurities on the dissolved oxygen diaphragm, dispersing and peeling them off to achieve a cleaning effect. This method is a contactless cleaning method, which can effectively avoid damage to the dissolved oxygen diaphragm caused by the cleaning mechanism while achieving the cleaning effect.

[0016] The dissolved oxygen diaphragm in the present invention is designed to be detachable. If the surface of the dissolved oxygen diaphragm is too dirty or the oxygen sensitive layer is excessively excited due to fluorescence quenching reaction, resulting in the dissolved oxygen diaphragm failure, the dissolved oxygen diaphragm can be removed and replaced with the original dissolved oxygen diaphragm, which is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of the dissolved oxygen sensor of the present invention;

[0018] Figure 2 It is a side view of the dissolved oxygen sensor of the present invention.

[0019] In the picture:

[0020] 1. First sealing ring; 2. Front cover; 3. Blue LED laser light source; 4. Third sealing ring; 5. Sensor fixing base; 6. Second sealing ring; 7. Outer tube; 8. Circuit board; 9. Outlet connector; 10. Receiver; 11. Red LED reference light source; 12. Round lens; 13. Fixing block; 14. Dissolved oxygen diaphragm; 15. Ultrasonic probe; 16. Ultrasonic fixing tube. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of the embodiments. It should be noted that the drawings are schematic and not to scale. For the sake of clarity and convenience, the relative sizes and proportions of the parts shown in the drawings are exaggerated or reduced in size, and any sizes are only illustrative and not restrictive.

[0022] A dissolved oxygen sensor with ultrasonic cleaning, such as Figure 1-2 As shown, it includes a sensor holder 5, a sensor membrane, an outer tube 7, an ultrasonic fixing tube 16, and an ultrasonic probe 15. One end of the outer tube 7 is fixedly connected to the sensor holder 5, which is detachably connected to the sensor membrane. The side of the sensor holder 5 is connected to the ultrasonic fixing tube 16, and the end of the ultrasonic fixing tube 16 is provided with the ultrasonic probe 15, which faces the sensor membrane with a gap between them. The ultrasonic probe 15 emits ultrasonic waves toward the sensor membrane, thereby pushing water to clean the sensor membrane.

[0023] In some embodiments, Figure 1 As shown, the sensor membrane head includes a fixed block 13 connected to the sensor fixing base 5. The fixed block 13 is provided with a dissolved oxygen diaphragm 14, which is fixed to the fixed block 13 through the front cover 2. The dissolved oxygen diaphragm 14 is fixed to the fixed block 13 through the front cover 2. The dissolved oxygen diaphragm 14 can be replaced by opening the front cover 2.

[0024] In other embodiments, the front cover 2 can also simultaneously secure the fixing block 12 to the sensor holder 5. A third sealing ring 4 is provided between the front cover 2 and the sensor holder 5 for further waterproofing. A circular lens 12 is provided between the fixing block 12 and the sensor holder 5 to provide waterproofing when replacing the dissolved oxygen membrane 14.

[0025] In some embodiments, Figure 1 As shown, a first sealing ring 1 is provided between the front cover 2 and the dissolved oxygen membrane 14 . The first sealing ring 1 enables the dissolved oxygen membrane 14 to be fully fitted with the fixing block 13 .

[0026] In some embodiments, Figure 1 As shown, a circuit board 8 is provided inside the outer tube 7. The circuit board 8 is provided with a blue LED laser light source 3, a red LED reference light source 11, and a receiving end 10 for receiving optical signals. The blue LED laser light source 3 and the red LED reference light source 11 are used to indicate the operating status of the sensor.

[0027] In some embodiments, Figure 1As shown, a second sealing ring 6 is provided between the outer tube 7 and the sensor holder 5. The second sealing ring 6 enables the outer tube 7 and the sensor holder 5 to be sealed and connected, thereby protecting the components inside the outer tube 7.

[0028] In some embodiments, Figure 1 As shown, the other end of the outer tube 7 is provided with an outlet connector 9. The outlet connector 9 can be connected to other external devices, such as a computer.

[0029] In some embodiments, Figure 2 As shown, the ultrasonic fixing tube 16 is in the shape of an inverted "C".

[0030] In some embodiments, Figure 2 As shown, the ultrasonic probe 15 and the midpoint of the sensor membrane head are located on the same vertical line. Such a design allows the emitted ultrasonic waves to be directed directly towards the sensor membrane head, thereby improving cleaning efficiency.

[0031] In some embodiments, Figure 2 As shown, the ultrasonic fixing tube 16 is a hollow structure, and a wire connecting the ultrasonic probe 16 and the circuit board 8 is provided inside the tube.

[0032] Working principle:

[0033] Ultrasonic cleaning principle: When the dissolved oxygen sensor is working, a square wave signal is emitted by the circuit board 8 and transmitted to the ultrasonic probe 15 through the wire. The ultrasonic probe 15 converts the square wave signal into mechanical vibration, and then transmits the vibration to the dissolved oxygen diaphragm 14 through tiny bubbles in the water, thereby cleaning the dissolved oxygen diaphragm 14.

[0034] Principle of the sensor: When the dissolved oxygen sensor is working, the circuit board 8 controls the red light LED reference light source 11 and the blue light LED excitation light source 3. The circuit board excites the red light LED reference light source 11, and the red light is irradiated on the dissolved oxygen diaphragm 14 and then reflected on the receiving end 10. At this time, the receiving end 10 receives the red light signal; the circuit board 8 excites the blue light LED excitation light source 3, and the blue light is irradiated on the dissolved oxygen diaphragm 14 to stimulate the fluorescent molecules on the dissolved oxygen diaphragm 14, generating fluorescence. At this time, the receiving end 10 receives the fluorescence signal excited by the blue light; the receiving end 10 will convert the received optical signal into an electrical signal. The circuit board 8 processes and compares the two signals to measure the dissolved oxygen content in the liquid.

[0035] All standard parts used in this utility model can be purchased commercially, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as bolts, rivets, welding, etc. that are mature in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. In addition, the circuit connections adopt conventional connection methods in the existing technology and will not be described in detail here. Any matters not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0036] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, the terms "first" and "second" may explicitly or implicitly include one or more of the features.

[0037] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0039] In this specification, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, without conflicting with each other.

[0040] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0041] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dissolved oxygen sensor with ultrasonic cleaning, characterized in that: The invention comprises a sensor fixing seat (5), a sensor membrane head, an outer tube (7), an ultrasonic fixing tube (16) and an ultrasonic probe (15); one end of the outer tube (7) is fixedly connected to the sensor fixing seat (5), and the sensor fixing seat (5) is detachably connected to the sensor membrane head; the side of the sensor fixing seat (5) is connected to the ultrasonic fixing tube (16), and the end of the ultrasonic fixing tube (16) is provided with an ultrasonic probe (15), and the ultrasonic probe (15) is directly opposite to the sensor membrane head, with a gap between the two.

2. The dissolved oxygen sensor with ultrasonic cleaning according to claim 1, characterized in that The sensor membrane head comprises a fixing block (13) connected to the sensor fixing seat (5); a dissolved oxygen diaphragm (14) is provided on the fixing block (13); and the dissolved oxygen diaphragm (14) and the fixing block (13) are detachably connected to the sensor fixing seat (5) via the front cover (2).

3. The dissolved oxygen sensor with ultrasonic cleaning according to claim 2, characterized in that: A first sealing ring (1) is provided between the front cover (2) and the dissolved oxygen membrane (14).

4. The dissolved oxygen sensor with ultrasonic cleaning according to claim 1, characterized in that A circuit board (8) is provided inside the outer tube (7), and a blue LED laser light source (3), a red LED reference light source (11), and a receiving end (10) for receiving optical signals are provided on the circuit board (8).

5. The dissolved oxygen sensor with ultrasonic cleaning according to claim 1, characterized in that A second sealing ring (6) is provided between the outer tube (7) and the sensor fixing seat (5).

6. The dissolved oxygen sensor with ultrasonic cleaning according to claim 1, characterized in that The other end of the outer tube (7) is provided with an outlet connector (9).

7. The dissolved oxygen sensor with ultrasonic cleaning according to claim 1, characterized in that: The ultrasonic fixing tube (16) is in an inverted "C" shape.

8. The dissolved oxygen sensor with ultrasonic cleaning according to claim 1, characterized in that: The midpoint of the ultrasonic probe (15) and the sensor membrane head are located on the same vertical line.

9. The dissolved oxygen sensor with ultrasonic cleaning according to claim 1, characterized in that: The ultrasonic fixing tube (16) is a hollow structure, and a wire connecting the ultrasonic probe (15) and the circuit board (8) is provided inside the tube.

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