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CN-116465932-B - Gas analysis sensor

CN116465932BCN 116465932 BCN116465932 BCN 116465932BCN-116465932-B

Abstract

The invention discloses a gas analysis sensor, which comprises a sensor circuit, a measuring element and a connecting assembly for connecting the sensor circuit and the measuring element, wherein the measuring element comprises a shell, a copper sleeve, a baffle plate and a resistance wire, the copper sleeve is arranged on the inner side of the shell, the shell is provided with a vertical air inlet and a circular and vertically arranged air outlet, the baffle plate is arranged on the inner side of the copper sleeve and equally divides the inner cavity of the copper sleeve into two areas which are respectively a detection cavity and a reference cavity, the resistance wire is distributed in the detection cavity and the reference cavity in equal quantity, one side of the copper sleeve facing to the gas to be measured is provided with a transverse strip-shaped through hole, and one side of the copper sleeve facing to the gas to be measured is provided with a round hole.

Inventors

  • DING JIMIN
  • TANG YUNJIAN

Assignees

  • 上海振太仪表有限公司

Dates

Publication Date
20260512
Application Date
20230328

Claims (8)

  1. 1. A gas analysis sensor comprises a sensor circuit, a measuring element and a connecting assembly for connecting the sensor circuit and the measuring element, and is characterized in that the measuring element comprises a shell (15), a copper sleeve (13), a partition plate (2) and a resistance wire (1), wherein the copper sleeve (13) is arranged on the inner side of the shell (15), a vertical air inlet and a circular and vertically arranged air outlet are formed in the shell (15), the partition plate (2) is arranged on the inner side of the copper sleeve (13) and equally divides the inner cavity of the copper sleeve (13) into two areas, the two areas are respectively a detection cavity and a reference cavity, the resistance wire (1) is distributed in the detection cavity and the reference cavity in an equal amount, a strip-shaped through hole (16) which is transversely arranged is formed in one side, facing to the gas to be detected, of the copper sleeve (13), round holes (17) are formed in one side, which is away from the gas to be detected, of the copper sleeve, the round holes (16) are uniformly arranged, the total area of the round holes (17) is the area of a flow passage, the round holes (17) are uniformly arranged, the total area of the round holes is equal to the area of the round holes, and the total area of the round holes (17) is equal to the area of the flow passage area, and the total area is equal to the area of the flow passage area (80.
  2. 2. A gas analysis sensor according to claim 1, characterized in that the measuring element further comprises a membrane tube (19) which is sleeved outside the copper sleeve (13), a nickel screen (14) which is placed outside the membrane tube (19), and a baffle structure which is placed between the copper sleeve (13) and the membrane tube (19).
  3. 3. A gas analysis sensor according to claim 2, wherein the baffle structure comprises a body and a baffle (18), the baffle (18) being arranged obliquely at an angle α to the body and the surface of the baffle (18) being curved.
  4. 4. A gas analysis sensor according to claim 3, wherein the baffles (18) are arranged along the periphery of the body with opposite inclination between the upper and lower baffles (18).
  5. 5. A gas analysis sensor according to claim 3, wherein α is 10-30 °, the arc angle of the arc is 20-60 °, and the pore size of the nickel mesh (14) is 250-300 mesh.
  6. 6. A gas analysis sensor according to claim 2, characterized in that the membrane tube (19) is made of nickel powder sintered on a mesh tube.
  7. 7. A gas analysis sensor according to claim 1, characterized in that the resistance wire (1) is helically wound from a metal wire.
  8. 8. A gas analysis sensor according to claim 1, characterized in that the separator (2) is a perforated separator, the separator (2) being covered with a nickel gauze.

Description

Gas analysis sensor Technical Field The invention relates to the technical field of sensors, in particular to a gas analysis sensor. Background In the 21 st century, along with the rapid development of economy, various fields are continuously utilizing raw material production resources to meet the demands of human beings. Heavy gas is often used as a production raw material in the heavy industry fields such as nuclear industry, petrochemical industry and the like. Generally, a heavy gas as an industrial raw material is not pure, and a light impurity gas is present. The heavy gas with purity which does not reach the requirements of industry can not only influence the quality of the produced products, but also easily cause potential safety hazards. Therefore, the percentage content of the light impurity gas in the heavy gas is measured, and the purity of the detected gas can be guaranteed, so that the product quality is ensured, and the potential safety hazard is eliminated. The principle of the light impurity gas analysis protection sensor is that the analyzed gas flows through a measuring chamber and a compensating chamber respectively, and heat exchange is carried out between the analyzed gas and a hot wire in the chamber, so that the temperature of the hot wire is changed to cause resistance change, further, the change of an electric signal is generated, and the electric signal is detected to analyze the percentage content of the light gas. The existing gas analysis sensor, such as a gas analysis sensor with patent number CN201420636164.9, provides a mechanism for protecting the thermal conductance gas sensor when the gas pressure rises to a certain extent. There still remains a problem that affects the stability and accuracy of the sensor due to the difference in gas flux. Disclosure of Invention The invention aims to provide a gas analysis sensor, which solves the problem that the stability and accuracy of the sensor are affected due to different gas fluxes of the existing sensor. The invention is realized in such a way, the gas analysis sensor comprises a sensor circuit, a measuring element and a connecting assembly for connecting the sensor circuit and the measuring element, wherein the measuring element comprises a shell, a copper sleeve, a baffle plate and a resistance wire, the copper sleeve is arranged on the inner side of the shell, a vertical air inlet and a circular and vertically arranged air outlet are arranged on the shell, the baffle plate is arranged on the inner side of the copper sleeve and equally divides the inner cavity of the copper sleeve into two areas, the two areas are respectively a detection cavity and a reference cavity, the resistance wire is distributed in the detection cavity and the reference cavity in equal quantity, a strip-shaped through hole which is transversely arranged is arranged on one side of the copper sleeve facing to the gas to be detected, and a round hole is arranged on one side of the copper sleeve facing away from the gas to be detected. The analyzed gas flows through the sensor measuring chamber and the reference chamber respectively, and the percentage content of the light gas is measured by introducing the gas to take away the heat change of the resistance wire. The lateral strip-shaped through hole is formed in one side facing to the detected gas, and the round hole is formed in one side facing away from the detected gas, so that the gas flux entering the sensor is the same, and the stability and accuracy of the sensor are guaranteed. The invention further adopts the technical scheme that a detection cavity is connected with the incoming flow channel, and a reference cavity is connected with the outgoing flow channel. The invention further adopts the technical scheme that the plurality of strip-shaped through holes are uniformly arranged, the total area of the strip-shaped through holes is the area of an incoming flow channel, the plurality of round holes are uniformly arranged, and the total area of the round holes is the area of a outgoing flow channel. The square through holes are the same in size and uniformly distributed on the copper sleeve. The invention further adopts the technical scheme that the area ratio of the inflow channel to the outflow channel is (50-80): 1. The error signal, the beneficial signal and the reaction time are determined according to the structure of the sensor, the ratio of the error signal to the beneficial signal is related to the ratio of the area of the copper sleeve incoming flow channel to the area of the copper sleeve outgoing flow channel, when the area of the copper sleeve incoming flow channel to the area of the copper sleeve outgoing flow channel is between 50:1 and 80:1, the error signal is lower than the threshold voltage +/-0.5V, the beneficial signal is larger than 3.2V, and the reaction time is smaller than 1s. The incoming flow channel area is (50-80): 1, which causes the exchange speed of the gas medium