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CN-121994881-A - Gas detection device

CN121994881ACN 121994881 ACN121994881 ACN 121994881ACN-121994881-A

Abstract

The application provides a gas detection device which comprises a shell and a detection unit, wherein the shell is provided with a first cavity, a second cavity and a channel, the shell comprises a shell body, the shell is provided with corresponding walls for constructing the first cavity, the second cavity and the channel, the channel is communicated with the outside of the first cavity and the shell body, the second cavity is a closed cavity, the detection unit comprises a first detection part, a second detection part and a third detection part, a first induction element of the first detection part is positioned in the first cavity, a second induction element of the second detection part is positioned in the second cavity, and a third induction element of the third detection part is positioned in the channel. The detection result of the third detection portion can be used for consideration factors in the calculation of the refrigerant leakage amount, for example, the detection result of the third detection portion is compensated by an algorithm to reduce the influence of the disturbance variable of the refrigerant on the detection accuracy of the refrigerant leakage amount, and the detection result of the third detection portion is relatively close to the actual magnitude of the disturbance variable of the refrigerant affecting the resistance value of the first sensing element, so that the compensation is relatively accurate, and the detection accuracy of the refrigerant leakage amount is relatively high.

Inventors

  • Request for anonymity

Assignees

  • 杭州三花研究院有限公司

Dates

Publication Date
20260508
Application Date
20241031

Claims (10)

  1. 1. A gas detection apparatus, characterized in that the gas detection apparatus comprises: The shell (1), the shell (1) is provided with a first cavity (13), a second cavity (14) and a channel (15), the shell (1) comprises a shell body, the shell body is provided with corresponding walls for constructing the first cavity (13), the second cavity (14) and the channel (15), the channel (15) conducts the first cavity (13) and the outside of the shell body, and the second cavity (14) is a closed cavity; The detection unit (2), the detection unit (2) includes first detection portion (21), second detection portion (22), third detection portion (23), first detection portion (21) include first sensing element (211), second detection portion (22) include second sensing element (221), third detection portion (23) include third sensing element (231), first sensing element (211) are located first chamber (13), second sensing element (221) are located second chamber (14), third sensing element (231) are located passageway (15).
  2. 2. The gas detection device according to claim 1, wherein the channel (15) comprises a first channel (151), the housing body comprises a baffle wall (112 a), at least part of the baffle wall (112 a) is located between the first cavity (13) and the second cavity (14), the first channel (151) is located at the baffle wall (112 a), and the third sensing element (231) is located at the first channel (151), separating the first cavity (13) and the second cavity (14).
  3. 3. The gas detection device according to claim 2, wherein the channel (15) comprises a second channel (152), the second channel (152) conducting the first channel (151) and the first cavity (13), and orthographic projections of the third sensing element (231) and the second channel (152) in at least one plane perpendicular to the arrangement direction of the first cavity (13) and the second cavity (14) at least partially coincide.
  4. 4. A gas detection apparatus according to claim 3, wherein said barrier wall portion (112 a) is provided with a communication hole (152 a), said second passage (152) includes said communication hole (152 a), and/or, The shell body comprises a top cover (11) and a base (12), the top cover (11) comprises a baffle wall part (112 a), the base (12) is at least partially positioned at the bottom of the top cover (11), a gap (152 b) is formed between at least part of the base (12) and the baffle wall part (112 a), and the second channel (152) comprises the gap (152 b).
  5. 5. The gas detection device according to any one of claims 2-4, wherein the housing body comprises a top cover (11) and a base (12), the base (12) is at least partially located at the bottom of the top cover (11), the channel (15) comprises a first access hole (153) and a second access hole (154), the first access hole (153) is provided in the top cover (11), the second access hole (154) is provided in the base (12), the first access hole (153) is communicated with the first channel (151) and the housing body, and the second access hole (154) is communicated with the first cavity (13) and the housing body.
  6. 6. The gas detection device according to claim 5, wherein the top cover (11) comprises a side wall portion (112) and a top wall portion (111), the side wall portion (112) comprises the baffle wall portion (112 a), the top wall portion (111) is at least partially located at the top of the side wall portion (112), the top cover (11) is provided with a first recess with an open bottom end and a second recess with an open bottom end, the side wall portion (112) and the top wall portion (111) have corresponding walls constituting the first recess and the second recess, the first cavity (13) comprises the first recess, the second cavity (14) comprises the second recess, the base (12) comprises a first seat with an open bottom end facing the first recess, a second seat with an open bottom end facing the second recess, a third seat located between the first seat and the second seat; the second inlet and outlet hole (154) is arranged on the first seat part, or The second inlet and outlet hole (154) is arranged on the first seat part and the third seat part.
  7. 7. The gas detection apparatus according to claim 6, wherein the first access hole (153) is provided in the top wall portion (111) and is located between a top end face and a bottom end face of the top wall portion (111), one end of the first access hole (153) penetrates to a side face of the top wall portion (111), and the other end of the first access hole (153) communicates with the first passage (151).
  8. 8. The gas detection device according to any one of claims 1 to 4, wherein the third sensing element (231) is a temperature and humidity sensor, the housing body comprises a top cover (11) and a base (12), the top cover (11) is of an integral structure, and the base (12) is of an integral structure.
  9. 9. A gas detection device according to any one of claims 1-4, wherein the housing body comprises a top cover (11) and a base (12), the channel (15) comprises a second access hole (154), the gas detection device comprises a support (4), the detection unit (2) comprises a circuit board (24), the circuit board (24) is at least partially located at the bottom of the base (12), the support (4) comprises a support body, the support body is at least partially located between the circuit board (24) and the base (12) and supports the base (12), the support (4) is provided with a flow channel (41), the support body has a corresponding wall constituting the flow channel (41), and the flow channel (41) is communicated with the second access hole (154) and the outside of the support body.
  10. 10. The gas detection apparatus according to claim 9, wherein the holder body includes an annular wall portion (42), the flow passage (41) includes a main flow passage (411) and a side flow passage (412), the main flow passage (411) includes an inner hole of the annular wall portion (42), the side flow passage (412) is provided in the annular wall portion (42) and penetrates from an inner peripheral surface of the annular wall portion (42) to an outer peripheral surface of the annular wall portion (42), and the main flow passage (411) communicates the second inlet and outlet hole (154) and the side flow passage (412).

Description

Gas detection device Technical Field The application relates to the technical field of sensors, in particular to a gas detection device. Background Some air conditioning systems use a refrigerant that has combustibility and can bring potential safety hazards if leaked, so that a gas detection device needs to be configured to detect the leakage amount of the refrigerant so as to remove the potential safety hazards in time. The gas detection device is provided with sensing elements in an open cavity and a closed cavity respectively, the sensing elements in the open cavity and the sensing elements in the closed cavity are used as two bridge arms of a Wheatstone bridge, when refrigerant leaks into the open cavity, the thermal conductivity of gas in the open cavity can be influenced, the resistance value of the sensing elements in the open cavity is changed, and therefore the balance of the Wheatstone bridge is broken, and the leakage quantity of the refrigerant can be detected. However, the resistance of the sensing element is not only affected by the leakage amount of the refrigerant, but also by other disturbance variables of the refrigerant, such as the temperature of the refrigerant, the resistance of the sensing element in the open cavity and the resistance of the sensing element in the closed cavity are both affected by the disturbance variables, and relatively speaking, the influence of the temperature of the refrigerant on the sensing element in the open cavity is larger, and the influence of the disturbance variables can reduce the detection accuracy of the leakage amount of the refrigerant. Disclosure of Invention The present application provides a gas detection apparatus including: The shell is provided with a first cavity, a second cavity and a channel, the shell comprises a shell body, the shell body is provided with corresponding walls for constructing the first cavity, the second cavity and the channel, the channel conducts the first cavity and the outside of the shell body, and the second cavity is a closed cavity; The detection unit comprises a first detection part, a second detection part and a third detection part, wherein the first detection part comprises a first induction element, the second detection part comprises a second induction element, the third detection part comprises a third induction element, the first induction element is positioned in the first cavity, the second induction element is positioned in the second cavity, and the third induction element is positioned in the channel. According to the gas detection device provided by the application, the first detection part and the second detection part are used for detecting the leakage amount of the refrigerant based on the Wheatstone bridge principle, the third detection part can be used for detecting the disturbance variable of the refrigerant influencing the resistance values of the first sensing element and the second sensing element except the leakage amount of the refrigerant, the detection result of the third detection part can be used for considering factors when the leakage amount of the refrigerant is calculated, for example, the influence of the disturbance variable of the refrigerant on the detection accuracy of the leakage amount of the refrigerant is reduced by carrying out compensation through an algorithm, and the third sensing element of the third detection part is positioned in a channel which is conducted inside and outside a first cavity where the first sensing element is positioned, so that the refrigerant detected by the third sensing element is the part of the refrigerant which can enter the first cavity, and therefore, the detection result of the third detection part is relatively close to the true size of the disturbance variable influencing the resistance value of the first sensing element, and the compensation is relatively accurate, and the detection accuracy of the leakage amount of the refrigerant can be improved. Drawings FIG. 1 is a cross-sectional view of a first embodiment of a gas detection device provided by the present application; FIG. 2 is an enlarged view of the inner portion of the circle of FIG. 1; FIG. 3 is a perspective view of the top cover of the housing of FIG. 1; Fig. 4 is a perspective view of the base, the first detecting portion, the second detecting portion, and the third detecting portion of the housing of fig. 1; FIG. 5 is a perspective view of the bracket of FIG. 1; FIG. 6 is a cross-sectional view of a second embodiment of a gas detection device provided by the present application; FIG. 7 is an enlarged view of the inner portion of the circle of FIG. 6; FIG. 8 is a perspective view of the top cover of the housing of FIG. 6; FIG. 9 is a perspective view of another view of the top cover of the housing of FIG. 6; fig. 10 is a perspective view of the base, the first detecting portion, the second detecting portion, and the third detecting portion of the housing of fig. 6. The refe