A Hatch-type thermal conductivity principle gas concentration sensor

Abstract

The present invention discloses a Hatch-type thermal conductivity principle gas concentration sensor, comprising: an internal sensor, a temperature balance block, a circuit board, a sensor protection member, and a sensor main body housing; the internal sensor, the temperature balance block, and the circuit board are arranged in the sensor main body housing; the circuit board is arranged at the bottom of the sensor main body housing; the temperature balance block is arranged above the circuit board, and the temperature balance block is connected to the circuit board; the internal sensor is mounted on the temperature balance block, and the internal sensor is connected to the circuit board after passing through the temperature balance block; the sensor protection member is a T-shaped structure, and the sensor protection member is mounted on the outside of the internal sensor. The arrangement of the T-shaped sensor protection member can not only protect the internal sensor, but also offset the high-speed airflow, thereby ensuring the accuracy of gas concentration detection, and the temperature balance block can balance the temperature between the various components in the gas concentration sensor, thereby ensuring the overall stability of the gas concentration sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of gas concentration sensors, and particularly relates to a Hatch-type thermal conductivity principle gas concentration sensor. Background Art

[0002] Currently, gas leakage detection and alarm instruments are installed in some places in life. Their function is to monitor combustible or toxic and harmful dangerous gases. When there is a leakage, the concentration value is detected in real time. When the set concentration value is exceeded, an alarm is issued to remind personnel, and the personnel can then take relevant safety prevention operations in a timely manner.

[0003] The operation of the gas leakage detection and alarm instrument depends on the detection of the on-site gas by the gas concentration sensor. In the existing gas concentration sensor, the space entered from the air inlet directly blows on the surface of the gas sensor. When encountering a high-speed air flow, it is easy to generate false alarms. Because when there is a high-speed air flow, in a short time, the sensor senses a large number of target detection gas molecules, and the sensor is prone to misreport that the concentration of the detected target gas has increased. Moreover, the existing gas concentration sensor does not protect the core components. During the construction and installation process, slight drops, impacts or vibrations in the working environment after installation will affect the core components inside the sensor, resulting in inaccurate detection concentration or inability to work. In addition, there is a certain temperature gradient in the gas concentration sensor in the prior art, and the sample gas therein generates a thermal convection effect, causing interference with the co-existing information of the instrument and noise, which will also cause the problem of low stability of the thermal conductivity gas sensor. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention designs a Hatch-type thermal conductivity principle gas concentration sensor, including: an internal sensor, a temperature balance block, a circuit board, a sensor protection member and a sensor main body housing; the internal sensor, the temperature balance block and the circuit board are all arranged inside the sensor main body housing; wherein, the circuit board is arranged at the bottom of the sensor main body housing; the temperature balance block is arranged above the circuit board, and the temperature balance block is connected to the circuit board; the internal sensor is installed on the temperature balance block, and the internal sensor passes through the temperature balance block and then is connected to the circuit board; the sensor protection member is of a T-shaped structure, wherein, the "-" part of the T-shaped structure is arranged on the outer side of the sensor main body housing, and the "|" part of the T-shaped structure passes through the sensor main body housing and is connected to the internal sensor.

[0005] Preferably, the sensor protection component includes: a three-way connector, a double-ferrule clamp and a sample gas inlet component; the three-way connector and the sample gas inlet component are both arranged on the outside of the sensor main body shell; the number of the sample gas inlet components is two, and the two sample gas inlet components are respectively fixedly installed at the two ends of the three-way connector; one end of the double-ferrule clamp is fixedly connected to the three-way connector, and the other end of the double-ferrule clamp passes through the sensor main body shell and is connected to the internal sensor.

[0006] Preferably, the internal sensor includes: a sensor housing and a sensor body; one end of the sensor housing is fixed in the double-ferrule clamp, and the other end of the sensor housing is installed on the temperature balance block; the sensor body is arranged in the sensor housing, and the sensor body is connected to the circuit board after passing through the temperature balance block.

[0007] Preferably, one end of the sensor housing is fixed in the double-ferrule clamp by an interference fit connection mode, and the other end of the sensor housing is mounted on the temperature balancing block by an interference fit connection mode.

[0008] Preferably, a sample gas inlet hole is provided on the sample gas inlet piece, a sample gas circulation cavity inside the three-way connector is provided on the three-way connector, and a sample gas circulation cavity inside the internal sensor is provided on the sensor housing; wherein, the sample gas inlet hole is communicated with the sample gas circulation cavity inside the three-way connector, the sample gas circulation cavity inside the three-way connector is communicated with the sample gas circulation cavity inside the internal sensor, and the sensor body is arranged in the sample gas circulation cavity inside the internal sensor.

[0009] Preferably, the temperature balancing block is provided with an external cable interface, which is used to fix an external cable connection, and the external cable is connected to the circuit board.

[0010] Preferably, the number of internal sensors is at least two, and each internal sensor is provided with a corresponding sensor protection member; a temperature balancing pool is provided on the temperature balancing block, and the temperature balancing pool is used to balance the temperature between the components in the gas concentration sensor.

[0011] Preferably, a sensing system isolation cavity is formed between the circuit board and the sensor main body housing, and the sensing system isolation cavity is used for temperature conduction between components in the gas concentration sensor and heat dissipation of the circuit board.

[0012] Preferably, the three-way connector, the double-ferrule clamp and the sample gas inlet are all made of polytetrafluoroethylene; the sensor housing is made of tempered glass; the sensor body is made of tempered glass, platinum, rhodium or gold; the temperature balance block is made of aluminum or copper; and the circuit board is made of resin.

[0013] Preferably, a reference sensor is further provided on the temperature balancing block, and the reference sensor passes through the temperature balancing block and is connected to the circuit board. The reference sensor is used to compensate for the signal of the internal sensor.

[0014] Compared with the closest prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention installs a sensor protection member on the outside of the internal sensor, which avoids the direct exposure of the internal sensor, can play a protective role for the internal sensor, enhance the overall impact resistance of the gas concentration sensor, and can reduce the impact of slight drops and impacts during the construction and installation process or the vibration of the working environment after installation on the gas concentration sensor, thereby ensuring the accuracy of gas concentration detection.

[0016] 2. The present invention sets the sensor protection part as a T-shaped structure, so that the sample gas can enter from both sides of the sensor protection part and gather at the center of the sensor protection part, thereby offsetting the impact of the gas. In this way, when encountering high-speed airflow, it can avoid the internal sensor sensing a large number of target detection gas molecules in a short period of time, thereby reducing the occurrence of sensor false alarms and ensuring the accuracy of gas concentration detection.

[0017] 3. The setting of the temperature balance block of the present invention can balance the temperature among the components in the gas concentration sensor, thereby avoiding the symbiotic information interference and noise caused by the thermal convection effect of the sample gas, and ensuring the overall stability of the gas concentration sensor.

[0018] 4. The provision of the reference sensor of the present invention serves to compensate for the signal of the internal sensor, thereby achieving a more accurate measurement of the thermal conductivity of the gas medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the Hatch thermal conductivity principle gas concentration sensor of the present invention.

[0020] Reference numerals:

[0021] 1 - Three - way connector, 2 - Double - ferrule type tightening band, 3 - Internal sensor, 4 - Sample gas inlet part, 5 - Sensor housing, 6 - Sensor body, 7 - Temperature balance block, 8 - Circuit board, 9 - Sample gas inlet hole, 10 - Sensor main body housing, 11 - Internal sample gas flow cavity in the three - way connector, 12 - Internal sample gas flow cavity in the internal sensor, 13 - External cable interface, 14 - Reference sensor, 15 - Temperature balance pool, 16 - Sensing system isolation cavity. Specific embodiments

[0022] 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. Embodiment 1

[0023] As Figure 1 shown, the present invention provides a Hatch - type thermal conductivity principle gas concentration sensor, including: an internal sensor 3, a temperature balance block 7, a circuit board 8, a sensor protection part, and a sensor main body housing 10; the internal sensor 3, the temperature balance block 7, and the circuit board 8 are all arranged inside the sensor main body housing 10; wherein, the circuit board 8 is arranged at the bottom of the sensor main body housing 10; the temperature balance block 7 is arranged above the circuit board 8, and the temperature balance block 7 is connected to the circuit board 8; the internal sensor 3 is installed on the temperature balance block 7, and the internal sensor 3 passes through the temperature balance block 7 and then is connected to the circuit board 8; the sensor protection part is of a T - shaped structure, wherein, the "-" part of the T - shaped structure is arranged outside the sensor main body housing 10, and the "|" part of the T - shaped structure passes through the sensor main body housing 10 and is connected to the internal sensor 3. Installing and setting a sensor protection part outside the internal sensor avoids the direct exposure of the internal sensor, can play a role in protecting the internal sensor, enhances the overall impact resistance of the gas concentration sensor, and can reduce the influence on the gas concentration sensor caused by slight dropping, impact during the construction and installation process, or vibration of the working environment after installation, thereby ensuring the accuracy of gas concentration detection. Setting the sensor protection part as a T - shaped structure enables the sample gas to enter from both sides of the sensor protection part and converge at the central position of the sensor protection part, thereby canceling out the impact of the gas on each other. In this way, when encountering a high - speed air flow, the situation that the internal sensor senses a large number of target detection gas molecules in a short time can be avoided, and further the occurrence of sensor false alarms can be reduced, ensuring the accuracy of gas concentration detection. The setting of the temperature balance block can balance the temperature between the components inside the gas concentration sensor, which can avoid the co - generated information interference and noise caused by the thermal convection effect of the sample gas, and ensure the overall stability of the gas concentration sensor.

[0024] Preferably, the sensor protection part includes: a three-way connector 1, a double-ferrule type tightening hoop 2 and a sample gas inlet part 4; the three-way connector 1 and the sample gas inlet part 4 are both arranged on the outside of the sensor main body housing 10; the number of the sample gas inlet parts 4 is two, and the two sample gas inlet parts 4 are respectively fixedly installed at the two ends of the three-way connector 1; one end of the double-ferrule type tightening hoop 2 is fixedly connected to the three-way connector 1, and the other end of the double-ferrule type tightening hoop 2 passes through the sensor main body housing 10 and is connected to the internal sensor 3.

[0025] Preferably, the internal sensor 3 includes: a sensor housing 5 and a sensor body 6; one end of the sensor housing 5 is fixed in the double-ferrule clamp 2, and the other end of the sensor housing 5 is installed on the temperature balance block 7; the sensor body 6 is arranged in the sensor housing 5, and the sensor body 6 is connected to the circuit board 8 after passing through the temperature balance block 7.

[0026] Preferably, one end of the sensor housing 5 is fixed in the double-ferrule clamp 2 by an interference fit connection, and the other end of the sensor housing 5 is mounted on the temperature balancing block 7 by an interference fit connection.

[0027] Preferably, a sample gas inlet hole 9 is provided on the sample gas inlet member 4, a three-way connector internal sample gas circulation cavity 11 is provided on the three-way connector 1, and an internal sensor internal sample gas circulation cavity 12 is provided on the sensor housing 5; wherein, the sample gas inlet hole 9 is connected with the three-way connector internal sample gas circulation cavity 11, the three-way connector internal sample gas circulation cavity 11 is connected with the internal sensor internal sample gas circulation cavity 12, and the sensor body 6 is arranged in the internal sensor internal sample gas circulation cavity 12.

[0028] Preferably, the temperature balancing block 7 is provided with an external cable interface 13 , which is used to fix an external cable connection, and the external cable is connected to the circuit board 8 .

[0029] Preferably, there are at least two internal sensors 3, each of which is provided with a corresponding sensor protection member. A temperature balancing cell 15 is provided on the temperature balancing block 7 to balance the temperatures of the various components within the gas concentration sensor. The provision of multiple internal sensors 3 further ensures the accuracy of gas concentration detection.

[0030] Preferably, a sensing system isolation cavity 16 is formed between the circuit board 8 and the sensor main housing 10. This cavity is used for temperature conduction between components within the gas concentration sensor and for heat dissipation from the circuit board 8. The configuration of the sensing system isolation cavity 16 functions similarly to the temperature balance block 7, both balancing the temperatures between components within the gas concentration sensor. This prevents symbiotic information interference and noise caused by thermal convection effects of the sample gas, thereby ensuring the overall stability of the gas concentration sensor.

[0031] Preferably, the three-way connector 1, the double-ferrule clamp 2 and the sample gas inlet 4 are all made of polytetrafluoroethylene; the sensor housing 5 is made of tempered glass; the sensor body 6 is made of tempered glass, platinum, rhodium or gold; the temperature balance block 7 is made of aluminum or copper; and the circuit board 8 is made of resin.

[0032] Preferably, a reference sensor 14 is also provided on the temperature balance block 7. The reference sensor 14 passes through the temperature balance block 7 and is connected to the circuit board 8. The reference sensor 14 is used to compensate for the signal of the internal sensor 3, thereby achieving more accurate measurement of the thermal conductivity of the gas medium.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] Furthermore, the terms "above" and "below" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "above" or "below" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0036] In this application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the pending claims.

Claims

1. A Hatch type thermal conductivity principle gas concentration sensor, characterized in that: Comprising: Internal sensor (3), temperature balance block (7), circuit board (8), sensor protection member and sensor body housing (10); The internal sensor (3), the temperature balance block (7) and the circuit board (8) are all arranged inside the sensor body housing (10); Wherein, the circuit board (8) is arranged at the bottom of the sensor body housing (10); The temperature balance block (7) is arranged above the circuit board (8), and the temperature balance block (7) is connected to the circuit board (8); The internal sensor (3) is mounted on the temperature balance block (7), and after passing through the temperature balance block (7), the internal sensor (3) is connected to the circuit board (8); The sensor protection member is of a T-shaped structure. Among them, the "one" part of the T-shaped structure is arranged outside the sensor body housing (10), the "vertical bar" part of the T-shaped structure passes through the sensor body housing (10) and is connected to the internal sensor (3). The sensor protection member includes: a three-way connector (1), a double ferrule type tightener (2) and a sample gas inlet member (4); The three-way connector (1) and the sample gas inlet member (4) are both arranged outside the sensor body housing (10); The number of the sample gas inlet members (4) is two, and the two sample gas inlet members (4) are respectively fixedly installed at both ends of the three-way connector (1); One end of the double ferrule type tightener (2) is fixedly connected to the three-way connector (1), and the other end of the double ferrule type tightener (2) passes through the sensor body housing (10) and is connected to the internal sensor (3); An external cable interface (13) is arranged on the temperature balance block (7), and the external cable interface (13) is used for fixing the connection of an external cable, and the external cable is connected to the circuit board (8); The number of the internal sensors (3) is at least two, and each internal sensor (3) is correspondingly provided with one sensor protection member; A temperature balance pool (15) is arranged on the temperature balance block (7), and the temperature balance pool (15) is used for balancing the temperature among various components in the gas concentration sensor; A sensing system isolation cavity (16) is formed between the circuit board (8) and the sensor body housing (10), and the sensing system isolation cavity (16) is used for the temperature conduction among various components in the gas concentration sensor and the heat dissipation of the circuit board (8).

2. The Hatch thermal conductivity principle gas concentration sensor according to claim 1, characterized in that: The internal sensor (3) includes: a sensor housing (5) and a sensor body (6); One end of the sensor housing (5) is fixed inside the double ferrule type tightener (2), and the other end of the sensor housing (5) is mounted on the temperature balance block (7); The sensor body (6) is arranged inside the sensor housing (5), and after passing through the temperature balance block (7), the sensor body (6) is connected to the circuit board (8).

3. The Hatch thermal conductivity principle gas concentration sensor according to claim 2, characterized in that: One end of the sensor housing (5) is fixed in the double-ferrule clamp (2) by means of an interference fit connection, and the other end of the sensor housing (5) is mounted on the temperature balancing block (7) by means of an interference fit connection.

4. The Hatch type thermal conductivity principle gas concentration sensor according to claim 3, characterized in that: The sample gas inlet member (4) is provided with a sample gas inlet hole (9), the three-way connector (1) is provided with a three-way connector inner sample gas flow cavity (11), and the sensor housing (5) is provided with an internal sensor inner sample gas flow cavity (12); The sample gas inlet hole (9) is connected to the sample gas flow cavity (11) in the three-way connector, the sample gas flow cavity (11) in the three-way connector is connected to the sample gas flow cavity (12) in the internal sensor, and the sensor body (6) is arranged in the sample gas flow cavity (12) in the internal sensor.

5. The Hatch type thermal conductivity principle gas concentration sensor according to claim 4, characterized in that: The three-way connector (1), the double-ferrule clamp (2) and the sample gas inlet (4) are all made of polytetrafluoroethylene; The sensor housing (5) is made of tempered glass; The sensor body (6) is made of tempered glass, platinum, rhodium or gold; The temperature balancing block (7) is made of aluminum or copper; The circuit board (8) is made of resin.

6. The Hatch thermal conductivity principle gas concentration sensor according to any one of claims 1 to 5, characterized in that: A reference sensor (14) is also provided on the temperature balancing block (7). The reference sensor (14) passes through the temperature balancing block (7) and is connected to the circuit board (8). The reference sensor (14) is used to compensate for the signal of the internal sensor (3).

Images