Online dissolved oxygen sensor assembly

Abstract

The invention belongs to the technical field of dissolved oxygen measurement, and particularly relates to an online dissolved oxygen sensor assembly which comprises a sensor, a membrane head is mounted at the bottom of the sensor, a flushing device is arranged on one side of the sensor, and a detection assembly is arranged at the bottom of the sensor. The detection assembly comprises a sleeve arranged below the sensor and a chassis arranged on the bottom surface of the sleeve; an interception space is constructed through a sleeve and a base plate, liquid to be detected is intermittently intercepted around a membrane head, the contact time of the liquid and the membrane head is prolonged, dissolved oxygen is assisted to be fully diffused, and the detection accuracy is guaranteed; the inner pipe is driven to rotate, so that the nozzle rotates around the circumference of the film head for washing.

Description

Technical Field

[0001] The present invention belongs to the technical field of dissolved oxygen measurement, and particularly relates to an on-line dissolved oxygen sensor assembly. Background Art

[0002] In many fields such as environmental monitoring, aquaculture, sewage treatment, and industrial production, accurate and real-time monitoring of the dissolved oxygen content in water bodies is crucial. Dissolved oxygen in water is not only a key indicator for measuring water quality, directly related to the survival and reproduction of aquatic organisms, but also affects product quality and production efficiency in industrial processes. Publication No.: CN213148738U discloses a dissolved oxygen sensor with an automatic cleaning function. In this technology, "a fluorescence measurement device and a cleaning device are included. The fluorescence measurement device includes a membrane head provided with a fluorescent substance; the cleaning device is provided with a water inlet channel, a water outlet channel, a pumping device, and a nozzle for flushing the membrane head and other technical solutions, having technical effects such as keeping the surface of the membrane head clean and avoiding the influence on the measurement result when impurities adhere." Although this design has technical effects such as keeping the surface of the membrane head clean, only relying on the nozzle to flush one side of the membrane head causes impurities to easily accumulate on the side of the membrane head facing away from the nozzle. These residual impurities will gradually form a dirt layer, hindering the diffusion of dissolved oxygen and interfering with the accurate detection of dissolved oxygen by the sensor. Moreover, during the process of detecting dissolved oxygen while flushing the membrane head, the impact of the water flow will cause strong disturbance of the water body around the membrane head, making the distribution of dissolved oxygen uneven and greatly reducing the detection efficiency of dissolved oxygen in the water body.

[0003] Therefore, an on-line dissolved oxygen sensor assembly is designed to solve the above problems. Summary of the Invention

[0004] To solve the problems raised in the above background art, the present invention provides an on-line dissolved oxygen sensor assembly, which can effectively solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: An on-line dissolved oxygen sensor assembly includes a sensor, a membrane head is installed at the bottom of the sensor, and a flushing device is arranged on one side of the sensor; A detection component is arranged at the bottom of the sensor. The detection component includes a sleeve arranged below the sensor, a chassis arranged on the bottom surface of the sleeve, and a straight rod one, a rotary joint, a rigid tube, a limiting block, a bent tube, an inner tube, an outer tube, a ball, a reversing member, a side plate, a cross bar two, and a spring three for intermittently intercepting liquid inside the sleeve and rotatingly flushing the membrane head; A drainage component is provided on the outer side of the sleeve. The drainage component includes a housing provided below the sleeve, and a plug rod, a fourth spring, a third bottom plate, a top plate, a hollow rod, and a trapezoidal plate for automatically discharging the liquid intercepted inside the sleeve.

[0006] Preferably, as an on-line dissolved oxygen sensor assembly of the present invention, two side plates are fixedly connected to the bottom surface of the sensor. A sleeve is provided between the two side plates. The sleeve is fixedly connected to the bottom surface of the sensor. A chassis is provided below the sleeve. A bent pipe is inserted into a through hole opened inside the chassis. The bent pipe is movably connected to the chassis. A hard pipe is inserted into the bottom end of the bent pipe. Two limiting blocks are fixedly connected to the surface of the hard pipe. The limiting blocks are inserted into limiting grooves opened inside the bent pipe. A nozzle is installed at the top end of the bent pipe. A rotary joint is installed at the bottom end of the hard pipe. A water pipe is fixedly inserted into the water inlet end of the rotary joint. The end of the water pipe away from the rotary joint is inserted into the water outlet channel in the flushing device.

[0007] Preferably, as an on-line dissolved oxygen sensor assembly of the present invention, an outer pipe is fixedly connected to the bottom surface of the chassis. An inner pipe is inserted into the inner part of the outer pipe. A spiral groove is opened on the circumferential surface of the inner pipe. A ball is arranged inside the spiral groove. The ball is fixedly connected to the inside of the outer pipe.

[0008] Preferably, as an on-line dissolved oxygen sensor assembly of the present invention, two symmetrically arranged connecting blocks are fixedly connected to the surface of the bent pipe. Both of the two connecting blocks are located inside the inner pipe, and the surface of the connecting block away from the bent pipe is fixedly connected to the inner pipe.

[0009] Preferably, as an on-line dissolved oxygen sensor assembly of the present invention, a reversing member is arranged on the surface of the inner pipe. The reversing member includes an L-shaped rod, a first bottom plate, and a first spring. A first cross bar is fixedly connected between the two side plates. Two L-shaped rods are respectively inserted into two symmetrically opened first slots inside the first cross bar. The adjacent ends of the two L-shaped rods are rotatably connected to the inner pipe through bearings. A first bottom plate is arranged below the first cross bar. The bottom ends of the two L-shaped rods are fixedly connected to the upper surface of the first bottom plate. A first spring is arranged between the first bottom plate and the first cross bar. The two ends of the first spring are respectively fixedly connected to the first cross bar and the first bottom plate.

[0010] Preferably, the reversing member further includes a clamping block, an isosceles trapezoidal block, and a second spring. A transverse groove communicating with the first slot is opened inside the first cross bar, and a second spring and a clamping block are arranged inside the transverse groove. The two ends of the second spring are respectively fixedly connected to the clamping block and the first cross bar. The clamping block is slidably connected to the first cross bar. Two clamping slots are respectively opened on the surfaces of the two L-shaped rods away from each other.

[0011] Preferably, as an on-line dissolved oxygen sensor assembly of the present invention, two straight rods I are respectively inserted into two insertion slots II symmetrically opened on one surface of the cross bar. The tops of the two straight rods I are fixedly connected to the bottom surface of the chassis. A bottom plate II is arranged below the cross bar I. The bottoms of the two straight rods I are fixedly connected to the bottom plate II. Two spring III are fixedly connected to the bottom surface of the bottom plate II. A cross bar II is fixedly connected between the two side plates. The bottom ends of the spring III are fixedly connected to the cross bar II.

[0012] Preferably, as an on-line dissolved oxygen sensor assembly of the present invention, two U-shaped connecting plates are fixedly connected to the surface of the outer ring of the sleeve. The side away from the sleeve of the U-shaped connecting plate is fixedly connected to the side plate. The upper surface of the U-shaped connecting plate is flush with the upper surface of the sleeve. A drainage groove I communicating with the inside of the U-shaped connecting plate is opened on the upper surface of the sleeve. A drainage groove II communicating with the U-shaped connecting plate is opened on the upper surface of the side plate.

[0013] Preferably, as an on-line dissolved oxygen sensor assembly of the present invention, a plug rod is inserted into an insertion slot IV opened inside the cross bar II. The top of the plug rod is fixedly connected to the bottom plate II. The plug rod is inserted into an insertion slot V opened inside the housing. The bottom end of the plug rod is fixedly connected to a bottom plate III. A spring IV is sleeved on the surface of the plug rod. The two ends of the spring IV are respectively fixedly connected to the bottom plate III and the housing.

[0014] Preferably, as an on-line dissolved oxygen sensor assembly of the present invention, two hollow rods are respectively inserted into two insertion slots III opened on the surface of the cross bar II. The hollow rods are slidably connected to the cross bar II. The top of the hollow rod is fixedly connected to a top plate. The bottom end of the hollow rod is fixedly connected to a trapezoidal plate. The trapezoidal plate is inserted into a trapezoidal groove opened on the bottom surface of the housing.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The structure of the present invention is scientific and reasonable, and it is safe and convenient to use: 1. A detection component is provided. By constructing an interception space through the sleeve and the chassis, the liquid to be detected is intermittently intercepted around the membrane head, prolonging the contact time between the liquid and the membrane head, facilitating the full diffusion of dissolved oxygen, ensuring the detection accuracy, and avoiding the reduction of the dissolved oxygen concentration near the membrane head due to detection consumption, which affects the result. By using the rotary joint, the hard pipe, the bent pipe and related structures, during the downward movement of the chassis, through the cooperation of the outer pipe, the ball and the spiral groove, the inner pipe is driven to rotate, and then the nozzle rotates around the circumference of the membrane head for flushing. Moreover, the inner pipe can move downward for a certain distance and rotate in the reverse direction, increasing the flushing area, realizing multi-directional flushing of the high and low parts of the membrane head, effectively removing the impurities attached to the membrane head, and solving the problem that the impurities hinder the contact between the dissolved oxygen and the sensitive element.

[0016] 2. A drainage component is provided, which relies on structures such as the housing, the insertion rod, and the spring. According to the change in the liquid volume in the housing, it automatically controls the up and down movement of the chassis, realizes the timely drainage of the intercepted liquid in the sleeve into the housing, and when the liquid level reaches a certain level, the liquid in the housing is automatically discharged through the trapezoidal groove to complete the drainage cycle; By using the top plate, the hollow rod, and the trapezoidal plate, when the liquid in the housing does not reach the drainage threshold, it closely adheres to the inner wall of the trapezoidal groove to prevent liquid leakage; and the trapezoidal plate is made of plastic foam material. Under the action of gravity and buoyancy, it can not only ensure the sealing effect but also descend with the liquid level during drainage, reducing the residual liquid in the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 is a partial cross-sectional view taken along line A-A in the present invention; Figure 3 For the present invention Figure 2 is an enlarged view of part A in the present invention; Figure 4 For the present invention Figure 2 is an enlarged view of part B in the present invention; Figure 5 For the present invention Figure 2 is an enlarged view of part C in the present invention; Figure 6 is a schematic diagram of the structure of the sleeve and the side plate in the present invention; Figure 7 is a schematic diagram of the structure of the trapezoidal plate and the hollow rod in the present invention; Figure 8 is a schematic diagram of the structure of the second bottom plate and the spring three in the present invention; Figure 9 is a schematic diagram of the structure of the inner tube and the bent tube in the present invention; Figure 10 is a schematic diagram of the structure of the limit block and the rigid tube in the present invention; Figure 11 is a schematic diagram of the structure of the first cross bar and the side plate in the present invention; In the figure: 1. Sensor; 2. Membrane head; 3. Detection component; 31. Water pipe; 32. Sleeve; 33. Chassis; 34. First cross bar; 35. First straight bar; 36. Rotary joint; 37. Rigid pipe; 38. Limit block; 39. Bent pipe; 310. Nozzle; 311. Limit groove; 312. Inner pipe; 313. Spiral groove; 314. Outer pipe; 315. Ball; 316. Connecting block; 317. Reversing part; 3171. L-shaped bar; 3172. First slot; 3173. First bottom plate; 3174. First spring; 3175. Card slot; 3176. Block; 3177. Horizontal slot; 3178. Second spring; 318. Side plate; 319. Second bottom plate; 320. Third spring; 321. Second slot; 322. Second cross bar; 4. Drainage component; 41. Fourth slot; 42. Plug rod; 43. Fourth spring; 44. Third bottom plate; 45. Housing; 46. Top plate; 47. Hollow rod; 48. Third slot; 49. Trapezoidal plate; 410. Trapezoidal groove; 411. First drainage groove; 412. U-shaped connecting plate; 413. Second drainage groove; 415. Fifth slot; 5. Flushing device. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0019] Embodiment: As Figures 1-11 shown, the present invention provides a technical solution, an in-line dissolved oxygen sensor assembly, including a sensor 1, a membrane head 2 is installed at the bottom of the sensor 1, and a flushing device 5 is arranged on one side of the sensor 1; A detection component 3 is arranged at the bottom of the sensor 1. The detection component 3 includes a water pipe 31, a sleeve 32, a chassis 33, a first cross bar 34, a first straight bar 35, a rotary joint 36, a rigid pipe 37, a limit block 38, a bent pipe 39, a nozzle 310, an inner pipe 312, a spiral groove 313, an outer pipe 314, a ball 315, a connecting block 316, a side plate 318, a second bottom plate 319, a second cross bar 322 and a third spring 320. Two side plates 318 are fixedly connected to the bottom surface of the sensor 1. A sleeve 32 is arranged between the two side plates 318. The sleeve 32 is fixedly connected to the bottom surface of the sensor 1. A chassis 33 is arranged below the sleeve 32. A bent pipe 39 is inserted into a through hole formed inside the chassis 33. The bent pipe 39 is movably connected to the chassis 33. A rigid pipe 37 is inserted into the bottom end of the bent pipe 39. Two limit blocks 38 are fixedly connected to the surface of the rigid pipe 37. The limit blocks 38 are inserted into limit grooves 311 formed inside the bent pipe 39. The limit blocks 38 are slidably connected to the bent pipe 39. The rigid pipe 37 is hermetically and slidably connected to the bent pipe 39. A nozzle 310 is installed at the top end of the bent pipe 39. A rotary joint 36 is installed at the bottom end of the rigid pipe 37. A water pipe 31 is fixedly inserted into the water inlet end of the rotary joint 36. The end of the water pipe 31 away from the rotary joint 36 is inserted into a water outlet channel in a flushing device 5.

[0020] A bottom plate of the chassis 33 is fixedly connected to an outer pipe 314. An inner pipe 312 is inserted into the inner part of the outer pipe 314. A spiral groove 313 is formed on the circumferential surface of the inner pipe 312. A ball 315 is arranged inside the spiral groove 313. The ball 315 is fixedly connected to the inside of the outer pipe 314. The ball 315 is slidably connected to the inner pipe 312.

[0021] Two symmetrically arranged connecting blocks 316 are fixedly connected to the surface of the bent pipe 39. Both of the two connecting blocks 316 are located inside the inner pipe 312. One side of the connecting block 316 away from the bent pipe 39 is fixedly connected to the inner pipe 312.

[0022] An inversion part 317 is arranged on the surface of the inner pipe 312. The inversion part 317 includes an L-shaped rod 3171, a first bottom plate 3173 and a first spring 3174. A first cross bar 34 is fixedly connected between the two side plates 318. The L-shaped rods 3171 are respectively inserted into two symmetrically formed first slots 3172 inside the first cross bar 34. The L-shaped rods 3171 are slidably connected to the first cross bar 34. One adjacent end of the two L-shaped rods 3171 is rotatably connected to the inner pipe 312 through a bearing. A first bottom plate 3173 is arranged below the first cross bar 34. The bottom ends of the two L-shaped rods 3171 are fixedly connected to the upper surface of the first bottom plate 3173. A first spring 3174 is arranged between the first bottom plate 3173 and the first cross bar 34. The two ends of the first spring 3174 are respectively fixedly connected to the first cross bar 34 and the first bottom plate 3173.

[0023] The reversing member 317 further includes a clamping block 3176 and a second spring 3178. A transverse groove 3177 communicating with the first slot 3172 is formed inside the first cross bar 34. The second spring 3178 and the clamping block 3176 are arranged inside the transverse groove 3177. The two ends of the second spring 3178 are fixedly connected to the clamping block 3176 and the first cross bar 34 respectively. The clamping block 3176 is slidably connected to the first cross bar 34. Two clamping slots 3175 are formed on the opposite sides of the two L-shaped rods 3171 away from each other.

[0024] Two first straight rods 35 are respectively inserted into two second slots 321 symmetrically formed on the surface of the first cross bar 34. The first straight rods 35 are slidably connected to the first cross bar 34. The tops of the two first straight rods 35 are fixedly connected to the bottom surface of the chassis 33. A second bottom plate 319 is arranged below the first cross bar 34. The second bottom plate 319 is located below the first bottom plate 3173. The bottoms of the two first straight rods 35 are fixedly connected to the second bottom plate 319. Two third springs 320 are fixedly connected to the bottom surface of the second bottom plate 319. A second cross bar 322 is fixedly connected between the two side plates 318. The second cross bar 322 is located below the first cross bar 34. The bottom end of the third spring 320 is fixedly connected to the second cross bar 322.

[0025] A drainage assembly 4 is arranged on the outer side of the sleeve 32. The drainage assembly 4 includes an insertion rod 42, a fourth spring 43, a third bottom plate 44, a housing 45, a top plate 46, a hollow rod 47, a U-shaped connecting plate 412 and a trapezoidal plate 49. Two U-shaped connecting plates 412 are fixedly connected to the outer surface of the outer ring of the sleeve 32. The side of the U-shaped connecting plate 412 away from the sleeve 32 is fixedly connected to the side plate 318. The upper surface of the U-shaped connecting plate 412 is flush with the upper surface of the sleeve 32. A first drainage groove 411 communicating with the inside of the U-shaped connecting plate 412 is formed on the upper surface of the sleeve 32. A second drainage groove 413 communicating with the U-shaped connecting plate 412 is formed on the upper surface of the side plate 318.

[0026] The insertion rod 42 is inserted into a fourth slot 41 formed inside the second cross bar 322. The insertion rod 42 is slidably connected to the second cross bar 322. The top end of the insertion rod 42 is fixedly connected to the second bottom plate 319. The insertion rod 42 is inserted into a fifth slot 415 formed inside the housing 45. The insertion rod 42 is slidably connected to the housing 45. The bottom end of the insertion rod 42 is fixedly connected to the third bottom plate 44. The third bottom plate 44 is located below the housing 45. A fourth spring 43 is sleeved on the surface of the insertion rod 42. The two ends of the fourth spring 43 are fixedly connected to the third bottom plate 44 and the housing 45 respectively.

[0027] Two hollow rods 47 are respectively inserted into two third slots 48 formed on the surface of the second cross bar 322. The hollow rods 47 are slidably connected to the second cross bar 322. The top end of the hollow rod 47 is fixedly connected to the top plate 46. The bottom end of the hollow rod 47 is fixedly connected to the trapezoidal plate 49. The trapezoidal plate 49 is inserted into a trapezoidal groove 410 formed on the bottom surface of the housing 45.

[0028] Working principle: A dissolved oxygen sensor with an automatic cleaning function disclosed in the publication number: CN213148738U. The sensor 1 includes: a PCB board, a light source, a silicon photocell, a filter, a light guiding device, and a membrane head 2 coated with a fluorescent substance at the bottom of the sensor 1. During use, a part of the light guiding device transmits the light generated by the light source to the fluorescent substance of the membrane head 2, and another part of the light guiding device conducts the fluorescent signal generated by the fluorescent substance on the membrane head 2 to the silicon photocell. The light source and the silicon photocell are both connected to the PCB board. When working, the PCB board controls the light source to emit blue excitation light, and the excitation light irradiates the membrane head 2 through the light guiding device. The fluorescent substance on the membrane head 2 is excited to generate fluorescence, and the fluorescence is conducted by the light guiding device and filtered by the filter to remove interference light of other wavelengths, and then received by the silicon photocell. The silicon photocell converts the fluorescent signal into an electrical signal and transmits it to the PCB board. The PCB board processes and calculates the signal to obtain the content of dissolved oxygen. For details, reference can be made to a dissolved oxygen sensor with an automatic cleaning function disclosed in the publication number: CN213148738U; The flushing device 5 includes a cable, a bracket, an end cap, a housing, a fixing part, a mounting seat, a temperature sensor, a protective cover, an inlet channel, a filter, an outlet channel, a pumping device, an inlet pipe, an outlet pipe, and a water pump seal cover. The pumping device is a micro water pump, and the micro water pump is connected to the PCB board. The micro water pump can be controlled to work through the controller on the PCB board. The pumping device pumps water from the inlet channel and makes the pumped water flow into the water pipe 31 through the outlet channel. The inlet channel and the outlet channel are both connected to the pumping device. For details, reference can be made to a dissolved oxygen sensor with an automatic cleaning function disclosed in the publication number: CN213148738U; Under the action of the pumping device, water continuously flows into the inside of the water pipe 31, and under the action of the rotary joint 36, it flows into the inside of the rigid pipe 37 and then into the inside of the bent pipe 39. Under the action of the nozzle 310, the water sprays from the inside of the nozzle 310 onto the surface of the membrane head 2. As the water continuously flows, the water in the space formed by the chassis 33 and the sleeve 32 continuously increases. When the liquid level height of the water in the sleeve 32 reaches the position of the first drainage groove 411, the water in the sleeve 32 flows along the inside of the first drainage groove 411 into the inside of the U-shaped connecting plate 412, then into the inside of the second drainage groove 413, and flows into the inside of the housing 45 from the second drainage groove 413. As the liquid in the housing 45 continuously increases, the force exerted by the housing 45 on the fourth spring 43 continuously increases, causing the fourth spring 43 to be continuously compressed, and then causing the housing 45 to continuously move downward. At this time, the liquid in the sleeve 32 exerts a downward force on the chassis 33, and the housing 45 exerts a downward force on the chassis 33 through the insertion rod 42. And under the action of the elastic potential energy of the third spring 320, the liquid in the sleeve 32 cannot flow out between the sleeve 32 and the chassis 33. That is, the force exerted by the water in the sleeve 32 on the chassis 33 and the pulling force exerted by the housing 45 on the chassis 33 cannot overcome the elastic force of the third spring 320 to cause the chassis 33 to move. And as the liquid continuously flows into the inside of the housing 45, the force exerted by the housing 45 on the chassis 33 continuously increases. During this process, the liquid to be detected is stored in the sleeve 32 and is in full contact with the membrane head 2, thereby ensuring the accuracy of the dissolved oxygen detection of the liquid; During this process, when there is no liquid inside the housing 45, under the gravity of the top plate 46, the hollow rod 47 and the trapezoidal plate 49, the trapezoidal plate 49 fits against the inner wall of the trapezoidal groove 410. When the liquid inside the housing 45 continuously increases, the liquid inside the housing 45 exerts a force on the trapezoidal plate 49, causing the trapezoidal plate 49 to fit tightly inside the trapezoidal groove 410, thereby avoiding the liquid from flowing out of the trapezoidal groove 410 during this process; As the liquid continues to flow into the interior of the housing 45, the force exerted by the housing 45 on the chassis 33 continuously increases. When the liquid inside the housing 45 reaches an appropriate amount, the housing 45 drives the bottom plate three 44 to move synchronously, and then pulls the bottom plate two 319 downward through the insertion rod 42, thereby compressing the spring three 320. The movement of the bottom plate two 319 causes the chassis 33 to move downward through the straight rod one 35. The movement of the chassis 33 causes the liquid inside the sleeve 32 to flow out along the gap between the sleeve 32 and the chassis 33 and into the interior of the housing 45. As the liquid inside the sleeve 32 continuously flows into the interior of the housing 45, and as the liquid flows from a high place into the interior of the housing 45, impacting the housing 45, and the liquid continuously flows out from the interior of the nozzle 310, the chassis 33 continuously moves downward. As the housing 45 and the chassis 33 move synchronously, when the housing 45 drives the trapezoidal plate 49, the hollow rod 47, and the top plate 46 to move until the top plate 46 fits against the surface of the cross bar two 322, as the housing 45 moves, the trapezoidal plate 49 can be moved out of the trapezoidal groove 410. At this time, the liquid inside the housing 45 can flow out along the interior of the trapezoidal groove 410. As the liquid inside the housing 45 continuously decreases, the downward force exerted on the chassis 33 continuously decreases. Under the action of the elastic potential energy of the spring three 320, the chassis 33 and the housing 45 can move upward synchronously until the chassis 33 fits against the bottom surface of the sleeve 32. The trapezoidal plate 49 is made of plastic foam material, and under the action of the gravity of the top plate 46 and the hollow rod 47, the trapezoidal plate 49 can be completely immersed in the liquid but will not sink into the water. When the liquid inside the housing 45 flows out along the interior of the trapezoidal groove 410, the upward movement of the housing 45 causes the trapezoidal plate 49 to move downward synchronously with the decrease in the liquid level in the housing 45, thereby enabling the remaining liquid inside the housing 45 to be smaller. And as the liquid inside the housing 45 continuously decreases, until the trapezoidal plate 49 fits inside the trapezoidal groove 410, facilitating the repetition of the above process to continue detecting the dissolved oxygen in the liquid, which is beneficial for intermittently making the liquid stay on the surface of the membrane head 2, thereby helping the dissolved oxygen to diffuse. Although the liquid will stay on the surface of the membrane head 2, the residence time is not long, so it will not cause the dissolved oxygen in the liquid near the membrane head 2 to decrease due to detection consumption, thus ensuring the accuracy during the dissolved oxygen detection process; During the downward movement of the chassis 33, the movement of the chassis 33 drives the outer tube 314 to move synchronously. The movement of the outer tube 314 drives the ball 315 to move synchronously. At this time, the bent tube 39 slides inside the chassis 33. The movement of the outer tube 314 driving the ball 315 can cause the inner tube 312 to rotate under the action of the spiral groove 313. The rotation of the inner tube 312 drives the bent tube 39 to rotate synchronously through the connecting block 316, and then drives the nozzle 310 to rotate. The rotation of the nozzle 310 can flush the circumference of the membrane head 2. At this time, under the action of the water pressure inside the bent tube 39, only the bent tube 39 can rotate, and the bent tube 39 will not move downward. The rotation of the bent tube 39 drives the hard tube 37 to rotate synchronously. Under the action of the rotary joint 36, the hard tube 37 can rotate conveniently. When the ball 315 moves to fit with the bottom groove wall of the spiral groove 313, at this time, the bent tube 39 drives the nozzle 310 to rotate one circle. As the force applied by the chassis 33 to the outer tube 314 continuously increases, the force applied to the inner tube 312 synchronously increases. The force received by the inner tube 312 is applied to the L-shaped rod 3171 through the bearing. When the applied force is appropriate, the block 3176 can slide out from the inside of the card slot 3175, and then the block 3176 compresses the second spring 3178. When the block 3176 approaches another card slot 3175, under the action of the elastic potential energy of the second spring 3178, the block 3176 can slide into the inside of another card slot 3175. During this process, the movement of the L-shaped rod 3171 drives the inner tube 312 to move synchronously, and then the bent tube 39 moves downward. And at this time, the chassis 33 moves downward to the limit and starts to move upward. The chassis 33 drives the outer tube 314 to move upward. During the sliding of the ball 315 inside the spiral groove 313, the inner tube 312 rotates counterclockwise one circle. And when the ball 315 slides to fit with the top groove wall of the spiral groove 313, under the action of the elastic potential energy of the third spring 320, the block 3176 can overcome the elastic potential energy of the second spring 3178 and slide out from the inside of the card slot 3175. At this time, the inner tube 312 moves upward. The movement of the inner tube 312 drives the bent tube 39 to move upward through the connecting block 316, and then realizes the effect of resetting the nozzle 310. It is beneficial to when the dissolved oxygen in the liquid inside the sleeve 32 is detected and the liquid flows out from the gap between the chassis 33 and the sleeve 32, make the nozzle 310 rotate around the surface of the membrane head 2 to achieve the effect of flushing the circumference of the membrane head 2. And after the nozzle 310 rotates one circle, it moves downward a certain distance and rotates counterclockwise one circle, thereby increasing the flushing area of the membrane head 2. And after the surface of the membrane head 2 is flushed, it automatically resets, thereby realizing the effect of first flushing the high place of the membrane head 2 and then flushing the low place of the membrane head 2, ensuring the effect of flushing the membrane head 2 in multiple directions, and then solving the problem that impurities will adhere to the surface of the membrane head 2 and prevent the dissolved oxygen from passing through the membrane head 2 and contacting the internal sensitive element; The function of the first spring 3174 is to assist the inner tube 312 to move downward. When the ball 315 is in contact with the bottom wall of the spiral groove 313 under the action of the first spring 3174, since the liquid inside the sleeve 32 is about to run out at this time, and the trapezoidal plate 49 has slid out of the trapezoidal groove 410 at this time, it is impossible to apply a large force to the inner tube 312 to make the inner tube 312 move downward. Before the inner tube 312 moves downward, the first spring 3174 is compressed and has elastic potential energy. At this time, it does not require a large force to achieve the effect of driving the inner tube 312 to move downward. However, during the downward movement of the outer tube 314, the ball 315 slides smoothly inside the spiral groove 313, making the resistance to the rotation of the bent tube 39 relatively small, so that the situation where the ball 315 rotates first before reaching the bottom end of the spiral groove 313 will not occur. When all the liquid inside the sleeve 32 and the housing 45 has flowed out, a large force is applied to the L-shaped rod 3171 under the action of the elastic potential energy of the third spring 320, and then the L-shaped rod 3171 can be made to move upward. When the shapes of the clamping block 3176 and the clamping groove 3175 are as Figure 4 and Figure 9 shown, when an appropriate longitudinal force is applied to the L-shaped rod 3171, the L-shaped rod 3171 can be made to move.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An on-line dissolved oxygen sensor assembly, comprising a sensor, and a membrane head is installed at the bottom of the sensor, characterized in that: The bottom of the sensor is provided with a detection component. The detection component includes a sleeve fixed to the bottom surface of the sensor. A chassis is arranged below the sleeve. A bent pipe is movably inserted into the chassis. The bottom end of the bent pipe is inserted with a rigid pipe. An outer pipe is fixed to the bottom surface of the chassis. An inner pipe is inserted into the outer pipe. A spiral groove is formed on the surface of the inner pipe and there are balls inside. The balls are fixed inside the outer pipe.

2. The on-line dissolved oxygen sensor assembly according to claim 1, wherein: Two side plates are fixed to the bottom surface of the sensor. A sleeve is arranged between the two side plates. Two limiting blocks are fixed to the surface of the rigid pipe. The limiting blocks are slidably inserted into the limiting grooves formed inside the bent pipe. A cross bar one and a cross bar two are fixed between the two side plates.

3. The on-line dissolved oxygen sensor assembly according to claim 1, wherein: A rotary joint is installed at the bottom end of the rigid pipe. A nozzle is installed at the top end of the bent pipe. The water inlet end of the rotary joint is connected to a water pipe. The water outlet end of the water pipe is connected to the water outlet channel of the flushing device.

4. The on-line dissolved oxygen sensor assembly according to claim 1, characterized in that: Two connecting blocks are fixed between the inner pipe and the bent pipe.

5. The on-line dissolved oxygen sensor assembly according to claim 1, wherein: A reversing component is arranged on the surface of the inner pipe. The reversing component includes L-shaped rods inserted into two slots one formed on the cross bar one. One adjacent end of the two L-shaped rods is rotatably connected to the inner pipe through a bearing. Bottom plates one are fixed to the bottom ends of the two L-shaped rods. A spring one is connected between the bottom plate one and the cross bar one.

6. The on-line dissolved oxygen sensor assembly according to claim 5, wherein: A transverse groove communicating with the slot one is formed inside the cross bar one. And a spring two and a clamping block are arranged in the transverse groove. Two ends of the spring two are respectively fixed to the clamping block and the cross bar one. The clamping block is slidably connected to the cross bar one. Two slots are respectively formed on the surfaces of the two L-shaped rods facing away from each other.

7. The on-line dissolved oxygen sensor assembly according to claim 5, wherein: Straight rods one are respectively inserted into two symmetrically arranged slots two on the cross bar one. The top ends of the two straight rods one are fixed to the bottom surface of the chassis. The bottom ends of the two straight rods one are both fixed to a bottom plate two. A spring three is connected between the bottom plate two and the cross bar two.

8. The on-line dissolved oxygen sensor assembly according to claim 1, wherein: A drainage component is arranged on the outer side of the sleeve. The drainage component includes a U-shaped connecting plate fixed between the sleeve and the side plate. A drainage groove one communicating with the inside of the U-shaped connecting plate is formed on the upper surface of the sleeve. A drainage groove two communicating with the U-shaped connecting plate is formed inside the side plate.

9. The on-line dissolved oxygen sensor assembly according to claim 2, wherein: A plug rod is inserted into a slot four formed inside the cross bar two. The top end of the plug rod is fixedly connected to the bottom plate two. The plug rod is inserted into a slot five formed inside the housing. The bottom end of the plug rod is fixedly connected to a bottom plate three. A spring four is sleeved on the surface of the plug rod. Two ends of the spring four are respectively fixed to the bottom plate three and the housing.

10. The on-line dissolved oxygen sensor assembly according to claim 2, wherein: Hollow rods are respectively inserted into two slots three formed on the surface of the cross bar two. The hollow rods are slidably connected to the cross bar two. A top plate is fixed to the top end of the hollow rod. A trapezoidal plate is fixed to the bottom end of the hollow rod. The trapezoidal plate is inserted into a trapezoidal groove formed on the bottom surface of the housing.

Images