Trace oxygen sensor
By designing the structure of a cylindrical chamber and annular gas tank in a trace oxygen sensor, the problem of overshoot and internal blind spots in the sensor under high oxygen concentration is solved, and a higher response speed and detection accuracy are achieved.
Patent Information
- Application Number
- CN202323354204.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-07
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2033-12-07
AI Technical Summary
Existing trace oxygen sensors are prone to overshoot under high oxygen concentrations, and the internal blind spots lead to a decrease in response speed and detection accuracy.
A trace oxygen sensor is designed, and its sensor base has a cylindrical chamber and annular air tank. The air inlet is in communication with the annular air tank and the air outlet is in communication with the bottom of the chamber to prevent the flow gas from directly acting on the sensor body and passing through the annular air. The grooves guide gas flow to prevent overshoot and reduce blind spots through the step surface structure and bosses.
It effectively avoids the occurrence of sensor overshoot, ensures effective gas replacement, and improves the sensor's response speed and detection accuracy.
Smart Images
Figure CN222439463U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a sensor, in particular to a trace oxygen sensor. Background Art
[0002] Trace oxygen sensor, commonly known as "fuel cell", is a consumable sensor. Its life depends on the oxygen consumption. Instrument sensors should be avoided as much as possible under high concentrations (greater than 1000ppm).
[0003] The oxygen concentration in the process gas is low, the less oxygen the oxygen sensor consumes, the longer the life of the oxygen sensor. The storage time of the instrument oxygen sensor (storage when the oxygen content is lower than 10ppm) can be up to 2 years. The oxygen concentration measured by the oxygen sensor during instrument use should be lower than 100ppm. The process gas enters the cathode and anode in the trace oxygen sensor to generate electron gain and loss and generate current. The current signal is processed by the signal circuit board card to measure the oxygen concentration value in the gas.
[0004] In the prior art, the air inlet of the process gas is directly facing the measuring area of the sensor, which can easily cause overshoot in the sensor measurement. On the other hand, there are many dead corners in the chamber of the sensor in the prior art, and the gas entering the dead corners is not easily replaced, thereby reducing the response speed and detection accuracy of the sensor.
[0005] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Utility Model Content
[0006] In view of this, the purpose of the utility model is to provide a trace oxygen sensor, which can effectively prevent the overshoot phenomenon of the sensor and effectively avoid the appearance of dead volume in the dead corner inside the sensor, thereby effectively ensuring the response speed and measurement accuracy of the sensor.
[0007] The utility model provides a trace oxygen sensor, comprising a sensor body, a sensor circuit board and a sensor substrate;
[0008] The sensor base has a cylindrical chamber, the sensor body is arranged in the chamber, the electrical signal input end of the sensor circuit board is connected to the electrical signal output end of the sensor body, the sensor base has a cover body, the cover body and the sensor base cooperate to seal the sensor body, and the sensor circuit board is arranged between the cover body and the sensor body;
[0009] The sensor base is provided with an air inlet and an air outlet, the inner side wall of the sensor base is provided with an annular air groove, the air inlet is communicated with the annular air groove, and the air outlet is communicated with the bottom of the chamber of the sensor base.
[0010] Further, the axis of the air inlet is perpendicular to but does not intersect the axis of the cylindrical chamber.
[0011] Furthermore, the cavity bottom of the sensor base has a boss, the boss is located at the edge of the cavity bottom of the sensor base, and the boss is used to maintain a gap between the sensor body and the cavity bottom of the sensor base.
[0012] Furthermore, there are multiple bosses, and the structures of the multiple bosses are the same, and the multiple bosses are arranged at equal intervals along the circumferential direction of the chamber.
[0013] Furthermore, the chamber side wall of the sensor substrate is a step surface structure, and the step surface is sunken along the axis of the chamber to form an annular embedding groove.
[0014] Furthermore, the lower surface of the cover body has an annular protrusion, and the annular protrusion is conformably embedded in the annular groove.
[0015] The beneficial effects of the utility model are as follows: through the utility model, when the process gas enters the sensor chamber, it will not directly act on the sensor body, but will flow along the annular gas groove, thereby effectively avoiding the occurrence of overshoot. Moreover, due to the guiding effect of the annular groove, the gas can be effectively replaced, preventing the occurrence of dead volume inside the chamber, and effectively ensuring the sensitivity and detection accuracy of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0017] Figure 1 This is a schematic diagram of the sensor substrate structure of the utility model.
[0018] Figure 2 This is a schematic diagram of the sensor cover structure of the utility model.
[0019] Figure 3 This is a front view of the sensor substrate of the present utility model.
[0020] Figure 4 for Figure 3 BB section view.
[0021] Figure 5 for Figure 3 CC section view.
[0022] Figure 6 for Figure 3 Top view of the . DETAILED DESCRIPTION
[0023] The utility model is further described below:
[0024] The utility model provides a trace oxygen sensor, comprising a sensor body 9, a sensor circuit board and a sensor substrate 1;
[0025] The sensor substrate 1 has a cylindrical chamber 3, the sensor body 9 is arranged in the chamber 3, the electrical signal input end of the sensor circuit board is connected to the electrical signal output end of the sensor body, the sensor substrate has a cover 8, the cover 8 cooperates with the sensor substrate to seal the sensor body, and the sensor circuit board is arranged between the cover and the sensor body (due to the shielding relationship, the circuit board is not shown in the figure); wherein the sensor body is a fuel cell body, having a cathode, an anode, an electrolyte, etc., and the sensor circuit board is integrated with a signal processing circuit, such as a current-voltage conversion circuit, an amplification circuit, a filtering circuit, a temperature compensation circuit, a zero adjustment circuit, and a range adjustment circuit, etc., which belong to the prior art and are not described in detail here;
[0026] The sensor base 1 is provided with an air inlet 2 and an air outlet 5, and the inner side wall of the sensor base 1 is provided with an annular air groove 7, the air inlet 2 is connected with the annular air groove 7, and the air outlet 5 is connected with the bottom of the chamber 3 of the sensor base 1; through the above structure, when the process gas enters the sensor chamber, it will not directly act on the sensor body, but flow along the annular air groove, thereby effectively avoiding the occurrence of overshoot, and due to the guiding effect of the annular groove, the gas can be effectively replaced, preventing the occurrence of dead volume inside the chamber, and effectively ensuring the sensitivity and detection accuracy of the sensor.
[0027] In this embodiment, the axis of the air inlet 2 is perpendicular to the axis of the cylindrical chamber 3 but does not intersect. Figure 5 As shown in this figure, the axis of the air inlet does not intersect with the center of the bottom circle of the chamber, thus forming a structure similar to an eccentricity. When the process gas enters, it flows directly around the annular gas groove. When the annular gas groove is filled, it flows to the sensor body. Moreover, after flowing through the annular gas groove, part of the gas flows downward along the side wall to the bottom of the chamber. While avoiding overshoot, the gas in the dead corners at the bottom of the chamber can be well replaced, thereby effectively ensuring the sensitivity and accuracy of the entire sensor.
[0028] In this embodiment, the bottom of the chamber of the sensor base 1 has a boss 6, and the boss 6 is located at the edge of the bottom of the chamber of the sensor base. The boss is used to maintain a gap between the sensor body and the bottom of the chamber of the sensor base. Through this structure, the dead angle inside the chamber can be effectively reduced, which is conducive to gas flow and avoids the inability to replace the gas in the dead angle.
[0029] In this embodiment, there are multiple bosses 6, and the structures of the multiple bosses are the same. The multiple bosses are arranged at equal intervals along the circumferential direction of the chamber. Through this structure, the posture balance of the sensor body after being placed in the chamber can be guaranteed, thereby ensuring the detection sensitivity and accuracy of the sensor body.
[0030] In this embodiment, the chamber side wall of the sensor substrate 1 is a step surface structure, and the step surface is sunken along the axis of the chamber to form an annular embedding groove 4.
[0031] The lower surface of the cover 8 has an annular protrusion 10, which is conformably embedded in the annular groove. Through the above structure, the sealing effect between the cover and the base can be effectively ensured, providing guarantee for the accuracy of oxygen content detection of process gas.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A trace oxygen sensor, characterized in that: It includes a sensor body, a sensor circuit board and a sensor matrix; The sensor base has a cylindrical chamber, the sensor body is arranged in the chamber, the electrical signal input end of the sensor circuit board is connected to the electrical signal output end of the sensor body, the sensor base has a cover body, the cover body and the sensor base cooperate to seal the sensor body, and the sensor circuit board is arranged between the cover body and the sensor body; The sensor base is provided with an air inlet and an air outlet, the inner side wall of the sensor base is provided with an annular air groove, the air inlet is communicated with the annular air groove, and the air outlet is communicated with the bottom of the chamber of the sensor base.
2. The trace oxygen sensor according to claim 1, characterized in that: The axis of the air inlet is perpendicular to but does not intersect the axis of the cylindrical chamber.
3. The trace oxygen sensor according to claim 1, characterized in that: The cavity bottom of the sensor base has a boss, the boss is located at the edge of the cavity bottom of the sensor base, and the boss is used to maintain a gap between the sensor body and the cavity bottom of the sensor base.
4. The trace oxygen sensor according to claim 3, characterized in that: There are multiple bosses, and the structures of the multiple bosses are the same. The multiple bosses are arranged at equal intervals along the circumferential direction of the chamber.
5. The trace oxygen sensor according to claim 1, characterized in that: The chamber side wall of the sensor substrate is a step surface structure, and the step surface is sunken along the axis of the chamber to form an annular embedding groove.
6. The trace oxygen sensor according to claim 5, characterized in that: The lower surface of the cover body is provided with an annular protrusion, and the annular protrusion is conformably embedded in the annular groove.