Oxygen analyzer and sensor replacement structure

Abstract

The invention discloses an oxygen analyzer and sensor replacement structure, which comprises a shell and further comprises a sensor, the detection part is arranged in the middle of the conveying assembly and used for detecting the oxygen content and the nitrogen flow. Through cooperation of the sealing assembly, the pressing plate and other structures, the sensor body is conveniently sealed, the sensor body is pressed down and fixed through the pressing plate, the first sealing piece is extruded by the sensor body and the detection cavity, the first sealing piece seals the sensor body and the detection cavity, and the detection precision is improved. The first sealing element is extruded into the middle of the sensor body so as to guarantee the sealing performance between the sensor body and the detection cavity, the second sealing element is extruded into the arc-shaped groove in the middle of the sensor body so as to carry out second sealing between the sensor body and the detection cavity, and the sealing performance between the sensor body and the detection cavity is guaranteed through the two sealing elements. And stable operation of the sensor body which is pressed down and fixed is ensured.

Description

Technical Field

[0001] This invention belongs to the technical field of detection equipment, specifically an oxygen analyzer and sensor replacement structure. Background Technology

[0002] When basic PCB boards are soldered in a reflow oven, the soldering environment has extremely stringent requirements. Among these requirements, high-purity nitrogen is a key factor in ensuring product yield and functional stability. During the soldering process, the oxygen content has a significant impact on the product's appearance and function. If the oxygen content exceeds the standard, the PCB board is prone to oxidation under high-temperature conditions, leading to defects such as oxide spots and pores on the solder joint surface, which seriously affects the product's appearance quality. More seriously, oxidation can also damage the internal structure of the solder joint, significantly reducing its conductivity and mechanical strength, thereby affecting the product's electrical performance and reliability, and may even lead to the scrapping of the entire batch of products, causing huge economic losses to the company. Therefore, in order to accurately control the oxygen content in the nitrogen environment, it is necessary to use a professional oxygen analyzer to detect the oxygen content in the nitrogen in real time and accurately, so as to ensure the soldering quality of the PCB board and ensure that the product can operate stably and reliably.

[0003] In basic PCB reflow oven soldering operations, electrochemical fuel cell oxygen analyzers, zirconia oxygen analyzers, and dual zirconia sensor oxygen analyzers are used. After a period of use, the internal sensors and silicone seals of these oxygen analyzers will be damaged. Therefore, the sensors need to be replaced after a period of use. Traditionally, the sensors are connected to the detection chamber by threads. This method will inevitably cause wear on the threads of the detection chamber during installation and disassembly, affecting the sealing performance after sensor replacement and affecting the service life of the equipment. Therefore, an oxygen analyzer and sensor replacement structure is proposed. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides an oxygen analyzer and a sensor replacement structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an oxygen analyzer, including a housing, and further comprising; The detection component, located in the middle of the conveying assembly, is used to detect oxygen content and nitrogen flow rate; A fixed structure, installed inside the housing, is used to fix and seal the detection components; A conveying component, located inside the housing, is used to convey nitrogen gas through the inside of the housing; The detection component consists of a flow meter, a detection chamber, and a sensor body. The flow meter is fixedly installed on one side of the housing, the detection chamber is located inside the fixed structure and is fixedly connected to the housing, and the sensor body is inserted into the detection chamber.

[0006] Preferably, a display screen is fixedly installed on one side of the housing, and the display screen and the flow meter are located on the same side. A communication port and a signal output port are fixedly installed in the middle of the side of the housing away from the display screen. At the same time, a power inlet and a cooling fan are fixedly installed on the side of the communication port and the signal output port. A vertical baffle is provided inside the housing, and a detection plate is fixedly installed on the side of the vertical baffle.

[0007] Preferably, the conveying assembly consists of a conveying structure and an air pump, wherein the air pump is located between the detection chamber and the detection plate and is fixedly connected to the outer shell; The conveying structure includes an air inlet and an air outlet fixedly connected to the outer shell. A copper air supply pipe is fixedly connected to one end of the air inlet inside the outer shell, and a rubber air supply pipe is fixedly connected to one end of the air outlet inside the outer shell.

[0008] Preferably, the air inlet and air outlet are on the same side of the housing as the communication port, and the air inlet is located above the air outlet. The air inlet is connected to the detection chamber through a copper air supply pipe, and the detection chamber is connected to the bottom of the flow meter through a copper air supply pipe.

[0009] Preferably, the upper end of the flow meter is connected to the air inlet of the air pump via a rubber air supply pipe, the air outlet of the air pump is connected to the air outlet, and a diverter pipe is fixedly connected to the middle of the rubber air supply pipe between the air pump outlet and the air outlet.

[0010] A sensor replacement structure includes a pressing assembly and a sealing assembly forming a fixed structure. The pressing assembly includes a sealing tube fixedly connected to a housing. A sliding rod is fixedly connected inside the sealing tube. A sealing head is fixedly connected to the bottom of the sliding rod. A pressure plate is fixedly connected to the top of a pair of sliding rods. A slot matching the sensor body is opened in the middle of the pressure plate.

[0011] Preferably, the sealing assembly includes a first sealing element sleeved on the lower end of the sensor body, and one-way valves are fixedly connected to both sides of the upper end of the detection chamber. The one-way valve on the side of the detection chamber closer to the air pump is connected to the diverter pipe, and the one-way valve on the side of the detection chamber away from the air pump is provided with an exhaust hole. A sealing air chamber is opened inside the detection chamber.

[0012] Preferably, the one-way valve and the sealing pipe are connected through a vent hole, the sealing air chamber is connected to the sealing pipe through a vent hole, a sliding block is slidably connected inside the sealing air chamber, and a second sealing element is fixedly connected inside the sliding block.

[0013] Preferably, the second seal is located on the bottom of the sliding block near the sensor body, and an arc-shaped groove that abuts against the second seal is provided at the corresponding position in the middle of the sensor body.

[0014] Preferably, the one-way valve delivers the gas from the diversion pipe into the sealing pipe and the sealing gas chamber. The gas is pushed by the compression sealing head to slide the slide rod downward inside the sealing pipe. At the same time, the sliding block is compressed and moved downward, causing the second sealing element to be compressed and deformed into the arc-shaped groove in the middle of the sensor body.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention facilitates the sealing of the sensor body by using a combination of sealing components and pressure plates. The pressure plate presses down on and fixes the sensor body, causing the first sealing element to be squeezed by the sensor body and the detection cavity, thus sealing the space between the sensor body and the detection cavity. The second sealing element is squeezed into the arc-shaped groove in the middle of the sensor body, thus providing a second seal between the sensor body and the detection cavity. The two seals ensure the airtightness between the sensor body and the detection cavity, allowing the pressed and fixed sensor body to operate stably. This invention facilitates the fixation of the sensor body by setting up a pressing component and a pressure plate. The pressure plate is pulled by a sliding rod, causing it to move downward and squeeze the sensor body, thus fixing the sensor body under pressure. Compared with traditional threaded fixing, the pressing fixation will not cause excessive wear and damage to the detection cavity, saving parts costs and reducing the difficulty of replacement. This invention facilitates the delivery of nitrogen gas by combining a conveying structure and an air pump. The air pump and conveying structure simultaneously inflate the sealed tube and sealed gas chamber, while copper and rubber gas pipes guide the nitrogen gas through the detection chamber and flow meter. A sensor inside the detection chamber detects the nitrogen gas flow rate, and the flow meter then measures the flow rate before the nitrogen is delivered via the air pump and rubber gas pipes. This ensures stable nitrogen delivery and allows for precise detection. Attached Figure Description

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top sectional view of the entire invention; Figure 3 This is a schematic diagram of the internal structure of the oxygen analyzer of the present invention; Figure 4 This is a cross-sectional view of the fixed structure of the present invention; Figure 5This is a cross-sectional view of the middle part of the fixed structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 This is a breakdown diagram of the fixed structure of the present invention; Figure 8 For the present invention Figure 7 Enlarged view at point B in the middle; Figure 9 This is a schematic diagram of gas flow according to the present invention.

[0017] In the picture: 1. Housing; 2. Display screen; 3. Flow meter; 4. Conveying structure; 41. Air inlet; 42. Copper air supply pipe; 43. Rubber air supply pipe; 44. Diverter pipe; 45. Air outlet; 5. Detection chamber; 6. Fixed structure; 61. Pressing assembly; 611. Sealing tube; 612. Slide rod; 613. Sealing head; 62. Pressure plate; 63. Sealing assembly; 631. First seal; 632. One-way valve; 633. Vent; 634. Sealing chamber; 635. Sliding block; 636. Second seal; 7. Air pump; 8. Sensor body; 9. Communication port; 10. Signal output port; 11. Power supply inlet; 12. Cooling fan; 13. Detection board. Detailed Implementation

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1 to 9 As shown, the present invention provides an oxygen analyzer, including a housing 1, and further comprising; The detection component, located in the middle of the conveying assembly, is used to detect oxygen content and nitrogen flow rate; The fixing structure 6 is installed inside the housing 1 and is used to fix and seal the detection components; A conveying component, which is disposed inside the housing 1, is used to convey nitrogen gas through the inside of the housing 1; The detection component consists of a flow meter 3, a detection chamber 5, and a sensor body 8. The flow meter 3 is fixedly installed on one side of the housing 1. The detection chamber 5 is located inside the fixed structure 6 and is fixedly connected to the housing 1. The sensor body 8 is inserted into the detection chamber 5.

[0020] like Figures 1 to 3 As shown, a display screen 2 is fixedly installed on one side of the housing 1, and the display screen 2 and the flow meter 3 are located on the same side. A communication port 9 and a signal output port 10 are fixedly installed in the middle of the side of the housing 1 away from the display screen 2. At the same time, a power inlet 11 and a cooling fan 12 are fixedly installed on the side of the communication port 9 and the signal output port 10. A vertical baffle is provided inside the housing 1, and a detection plate 13 is fixedly installed on the side of the vertical baffle.

[0021] The above solution involves using a display screen 2 and a detection board 13 to control the operation of the overall equipment. The display screen 2 also allows observation of the oxygen content inside the nitrogen gas. The cooling fan 12 is located near the detection board 13 to facilitate heat dissipation. The detection board 13 is connected to the sensor body 8 and the signal output port 10 via wiring to receive data from the sensor body 8 and output the data through the signal output port 10. This ensures real-time data upload and timely warnings when problems are detected in the nitrogen gas being used.

[0022] like Figure 3 and Figure 9 As shown, the conveying assembly consists of a conveying structure 4 and an air pump 7. The air pump 7 is located between the detection chamber 5 and the detection plate 13 and is fixedly connected to the outer shell 1. The conveying structure 4 includes an air inlet 41 and an air outlet 45 fixedly connected to the outer shell 1. A copper air supply pipe 42 is fixedly connected to one end of the air inlet 41 inside the outer shell 1, and a rubber air supply pipe 43 is fixedly connected to one end of the air outlet 45 inside the outer shell 1. The air inlet 41 and the air outlet 45 are on the same side of the housing 1 as the communication port 9, and the air inlet 41 is located above the air outlet 45. The air inlet 41 is connected to the detection chamber 5 through the copper air supply pipe 42, and the detection chamber 5 is connected to the bottom of the flow meter 3 through the copper air supply pipe 42. The upper end of the flow meter 3 is connected to the air inlet of the air pump 7 via a rubber air supply pipe 43. The air outlet of the air pump 7 is connected to the air outlet 45. A diverter pipe 44 is fixedly connected in the middle of the rubber air supply pipe 43 between the air outlet end of the air pump 7 and the air outlet 45.

[0023] The above scheme is adopted as follows: by setting up a conveying structure 4 and an air pump 7, nitrogen gas is input into the detection chamber 5 for detection by the conveying structure 4, and the flow rate is detected by the flow meter 3. The setting of the air inlet 41 and the copper gas supply pipe 42 facilitates the delivery of nitrogen gas to the detection chamber 5 and the flow meter 3. The setting of the rubber gas supply pipe 43 facilitates the disconnection of the air pump 7 from the flow meter 3. When supplying gas to the sealing pipe 611 and the sealing gas chamber 634, it does not pass through the flow meter 3 and the detection chamber 5, thus avoiding affecting the sealing performance of the detection chamber 5. By setting up the diversion pipe 44, the air pump 7 can deliver air to the sealing pipe 611 and the sealing air chamber 634 through the diversion pipe 44, so that the pressure plate 62 presses down and fixes the sensor body 8, and the second sealing element 636 provides a secondary seal for the sensor body 8, ensuring the stability and sealing of the sensor body 8.

[0024] A sensor replacement structure includes a pressing assembly 61 and a sealing assembly 63 that make up a fixing structure 6. The pressing assembly 61 includes a sealing tube 611 fixedly connected to the housing 1. A slide rod 612 is fixedly connected inside the sealing tube 611. A sealing head 613 is fixedly connected to the bottom of the slide rod 612. A pressure plate 62 is fixedly connected to the top of a pair of slide rods 612. A slot matching the sensor body 8 is opened in the middle of the pressure plate 62.

[0025] The above solution involves setting up a pressing component 61 and a pressure plate 62. The pressure plate 62 presses and fixes the sensor body 8, allowing the sensor body 8 to be fixed without threads. Compared with threaded fixing, pressing fixation does not cause wear that affects sealing and installation precision, thus improving the service life of the detection chamber 5. The sliding rod 612 and sealing head 613 inside the sealing tube 611 can be compressed by gas to pull down the pressure plate 62, causing the pressure plate 62 to press and fix the sensor body 8. Compared with threaded fixing, no additional tools are required.

[0026] like Figures 4 to 8 As shown, the sealing assembly 63 includes a first sealing element 631 sleeved on the lower end of the sensor body 8, and one-way valves 632 are fixedly connected to both sides of the upper end of the detection chamber 5. The one-way valve 632 on the side of the detection chamber 5 closer to the air pump 7 is connected to the diversion pipe 44. The one-way valve 632 on the side of the detection chamber 5 away from the air pump 7 is provided with an exhaust hole. A sealing air chamber 634 is opened inside the detection chamber 5. The one-way valve 632 is connected to the sealing tube 611 through the vent hole 633. The sealing air chamber 634 is connected to the sealing tube 611 through the vent hole 633. A sliding block 635 is slidably connected inside the sealing air chamber 634. A second sealing element 636 is fixedly connected inside the sliding block 635. The second seal 636 is located on the bottom of the sliding block 635 near the sensor body 8, and an arc-shaped groove that abuts against the second seal 636 is provided at the corresponding position in the middle of the sensor body 8.

[0027] The above scheme is adopted as follows: the sealing component 63 is used to ensure the sealing of the sensor body 8. The first sealing element 631 provides a first seal between the lower end of the sensor body 8 and the detection chamber 5. The sensor body 8 and the detection chamber 5 squeeze the first sealing element 631 to seal the sensor body 8 and the detection chamber 5. The second sealing element 636 provides a second seal for the sensor body 8. The one-way valve 632 controls the air intake and exhaust inside the sealing tube 611 and the sealing air chamber 634. The air vent 633 connects the sealing tube 611 and the sealing air chamber 634 to ensure that the air delivered by the one-way valve 632 can simultaneously push the sliding block 635 and the sliding rod 612 to move, so that the pressure plate 62 can fix the sensor body 8. The second sealing element 636 can be squeezed into the arc-shaped groove in the middle of the sensor body 8.

[0028] like Figures 2 to 9 As shown, the one-way valve 632 delivers the gas from the diversion pipe 44 into the sealing pipe 611 and the sealing gas chamber 634. The gas is pushed by the compression sealing head 613 to slide the slide rod 612 downward inside the sealing pipe 611. At the same time, the sliding block 635 is compressed and moved downward, causing the second sealing member 636 to be compressed and deformed into the arc-shaped groove in the middle of the sensor body 8.

[0029] Working principle and usage process of this invention: In use, nitrogen gas is input from the inlet 41, passes through the copper gas pipe 42 and enters the detection chamber 5. The sensor body 8 detects the oxygen inside the nitrogen gas and transmits the data to the detection board 13 for analysis. The data is then displayed on the display screen 2. After that, the nitrogen gas is transported to the flow meter 3 inside the detection chamber 5. The flow meter 3 detects the flow rate of the passing nitrogen gas. Then, the nitrogen gas is output from the rubber gas pipe 43 at the top of the flow meter 3 to the gas pump 7. The gas pump 7 outputs the nitrogen gas through the rubber gas pipe 43 and the outlet 45. When the sensor body 8 needs to be replaced, turn the knob on the one-way valve 632 to open the vent on the side of the one-way valve 632. Then, lift the pressure plate 62 to expel the air inside the sealing tube 611. At the same time, the second seal 636 resets and pushes the sealing air chamber 634 upward, allowing the air inside the sealing air chamber 634 to be discharged from the vent 633 and the one-way valve 632. Then, turn the knob on the one-way valve 632 to close the vent. At this time, the sensor body 8 can be directly pulled out from the detection chamber 5 and a new sensor body 8 can be inserted into the detection chamber 5. Compared with the traditional threaded fixing, this is more convenient. At the same time, when replacing, there is no need to pay attention to thread wear and re-tapping the threads. After inserting the new sensor body 8 into the detection chamber 5, remove the rubber air supply tube 43 from the air inlet of the air pump 7, then close the air outlet 45, and start the air pump 7. The air output by the air pump 7 is then delivered from the split pipe 44 to the one-way valve 632, and then enters the sealing tube 611 and the sealing air chamber 634 through the vent 633. This causes the slide rod 612 to be squeezed downward until the pressure plate 62 contacts the sensor body 8 and presses and fixes the sensor body 8. At the same time, the sliding block 635 moves downward inside the sealing air chamber 634, causing the second sealing element 636 to be squeezed and deformed, and enters the arc-shaped interior in the middle of the sensor body 8 to perform a secondary seal on the sensor body 8. This completes the replacement of the sensor body 8.

[0030] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An oxygen analyzer, comprising a housing (1), characterized in that, Also includes; The detection component, located in the middle of the conveying assembly, is used to detect oxygen content and nitrogen flow rate; A fixing structure (6) is installed inside the housing (1) for fixing and sealing the detection components; A conveying component, which is disposed inside the housing (1), is used to convey nitrogen gas through the housing (1); The detection component consists of a flow meter (3), a detection chamber (5) and a sensor body (8). The flow meter (3) is fixedly installed on one side of the outer shell (1). The detection chamber (5) is located inside the fixed structure (6) and is fixedly connected to the outer shell (1). The sensor body (8) is inserted into the detection chamber (5).

2. The oxygen analyzer according to claim 1, characterized in that: The outer casing (1) has a display screen (2) fixedly installed on one side, and the display screen (2) and the flow meter (3) are located on the same side. The outer casing (1) has a communication port (9) and a signal output port (10) fixedly installed in the middle of the side away from the display screen (2). At the same time, the communication port (9) and the signal output port (10) are provided with a power inlet (11) and a cooling fan (12) fixedly installed on the outer casing (1) on one side. The outer casing (1) has a vertical baffle inside, and a detection plate (13) is fixedly installed on the side of the vertical baffle.

3. The oxygen analyzer according to claim 1, characterized in that: The conveying assembly consists of a conveying structure (4) and an air pump (7). The air pump (7) is located between the detection chamber (5) and the detection plate (13) and is fixedly connected to the outer shell (1). The conveying structure (4) includes an air inlet (41) and an air outlet (45) fixedly connected to the outer shell (1). The end of the air inlet (41) located inside the outer shell (1) is fixedly connected to a copper air supply pipe (42), and the end of the air outlet (45) located inside the outer shell (1) is fixedly connected to a rubber air supply pipe (43).

4. The oxygen analyzer according to claim 3, characterized in that: The air inlet (41) and air outlet (45) are on the same side of the outer shell (1) as the communication port (9), and the air inlet (41) is located above the air outlet (45). The air inlet (41) is connected to the detection chamber (5) through the copper air supply pipe (42), and the detection chamber (5) is connected to the bottom of the flow meter (3) through the copper air supply pipe (42).

5. The oxygen analyzer according to claim 3, characterized in that: The upper end of the flow meter (3) is connected to the air inlet of the air pump (7) through a rubber air supply pipe (43). The air outlet of the air pump (7) is connected to the air outlet (45). A diverter pipe (44) is fixedly connected in the middle of the rubber air supply pipe (43) between the air outlet end of the air pump (7) and the air outlet (45).

6. A sensor replacement structure, applied to an oxygen analyzer according to any one of claims 1-5, comprising a pressure assembly (61) and a sealing assembly (63) constituting a fixing structure (6), characterized in that... ； The pressing assembly (61) includes a sealing tube (611) fixedly connected to the outer shell (1). A slide rod (612) is fixedly connected inside the sealing tube (611). A sealing head (613) is fixedly connected to the bottom of the slide rod (612). A pressure plate (62) is fixedly connected to the top of a pair of slide rods (612). A slot matching the sensor body (8) is opened in the middle of the pressure plate (62).

7. The sensor replacement structure according to claim 6, characterized in that: The sealing assembly (63) includes a first sealing element (631) sleeved on the lower end of the sensor body (8). One-way valves (632) are fixedly connected to both sides of the upper end of the detection chamber (5). The one-way valve (632) on the side of the detection chamber (5) closer to the air pump (7) is connected to the diverter pipe (44). The one-way valve (632) on the side of the detection chamber (5) away from the air pump (7) is provided with an exhaust hole. A sealing air chamber (634) is opened inside the detection chamber (5).

8. The sensor replacement structure according to claim 7, characterized in that: The one-way valve (632) is connected to the sealing tube (611) through a vent hole (633). The sealing air chamber (634) is connected to the sealing tube (611) through the vent hole (633). A sliding block (635) is slidably connected inside the sealing air chamber (634). A second sealing element (636) is fixedly connected inside the sliding block (635).

9. The sensor replacement structure according to claim 8, characterized in that: The second seal (636) is located on the side of the bottom of the sliding block (635) close to the sensor body (8), and an arc-shaped groove that abuts against the second seal (636) is provided in the middle of the sensor body (8).

10. The sensor replacement structure according to claim 7, characterized in that: The one-way valve (632) delivers the gas supplied by the diversion pipe (44) into the sealing pipe (611) and the sealing gas chamber (634). The gas is pushed by the squeeze sealing head (613) to slide the slide rod (612) downward inside the sealing pipe (611). At the same time, the sliding block (635) is squeezed and moved downward, causing the second sealing element (636) to be squeezed and deformed into the arc groove in the middle of the sensor body (8).

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