Thermal type gas mass flow meter sensor with dust protection structure

Abstract

The utility model discloses a thermal type gas mass flow meter sensor with a dust protection structure, belongs to the technical field of gas measurement, and aims to solve the problem that the service life of the sensor is greatly influenced due to the fact that an existing sensor probe is very easy to wear and damage in a measurement environment with dust due to the fact that the wall thickness is relatively thin. The thermal type gas mass flow meter sensor comprises a shell and N sensor probes, N is a positive integer, the thermal type gas mass flow meter sensor further comprises a protection pipe, the protection pipe is arranged on the outer side of the shell in a sleeving mode, the protection pipe and the shell are coaxially arranged, one end of the protection pipe is detachably connected with a shell body of a thermal type gas mass flow meter, and the other end of the protection pipe is detachably connected with the shell body of the thermal type gas mass flow meter. Two gas passing holes are machined in the outer side wall of the protection pipe, each gas passing hole corresponds to one end of one gas through groove, a dust blocking part corresponding to a sensor probe is arranged in each gas passing hole, and the dust blocking parts and the inner walls of the gas passing holes are integrally formed. The utility model is mainly used as a thermal gas mass flow meter sensor structure used in a pipeline through which dust airflow passes.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas measurement, and in particular relates to a thermal gas mass flow meter sensor with a dust protection structure. Background Art

[0002] In industrial production, it is necessary to measure the gas flow in pipelines in many occasions. In some occasions, such as measuring the air flow in the air supply duct of the boiler system, there is a lot of dust in the wind because the wind has to be preheated through the flue. At present, it is most appropriate to use a thermal gas flow meter to measure the air flow in large-section ducts, especially when high temperature conditions are added. However, the wall thickness of the two probes equipped with sensors in the thermal gas mass flowmeter is only 0.3mm, which is easily damaged by wear in a dusty measurement environment, greatly affecting the service life of the sensor. In the prior art, a layer of wear-resistant material film is usually added to the outside of the probe to protect the probe. However, in actual applications, in order to ensure that the sensor probe can reach a normal state of use, the film thickness should not be too large. If the film thickness is too large, the sensitivity of the probe will be reduced. When the film thickness is small, it is difficult to prevent the wear of the dust on the probe, and the wear resistance of the probe cannot be effectively improved. In addition, the film treatment greatly increases the production cost of the probe. If the expected wear-resistant effect and the service life of the probe cannot be extended, the economy of the sensor preparation will be greatly affected. Therefore, based on the above problems, it is in line with actual needs to develop a thermal gas mass flowmeter sensor with a dust protection structure. Utility Model Content

[0003] In order to solve the problem that the existing sensor probe is easily damaged by wear in a dusty measurement environment due to its thin wall thickness, which greatly affects the service life of the sensor, the utility model provides a thermal gas mass flow meter sensor with a dust protection structure;

[0004] A thermal gas mass flow meter sensor with a dust protection structure, the thermal gas mass flow meter sensor comprising a shell and N sensor probes, N being a positive integer, a gas through groove arranged along the extension direction of the pipeline length is processed on the outer circumferential surface of the shell, the N sensor probes are all arranged in the gas through groove, and one end of each sensor probe is inserted into the inner top of the shell, and a gap is provided between the other end of each sensor probe and the inner bottom of the gas through groove, the thermal gas mass flow meter sensor also comprises a protection tube, the protection tube is sleeved on the outer side of the shell, and the protection tube is coaxially arranged with the shell, one end of the protection tube is detachably connected with the shell of the thermal gas mass flow meter, two air holes are processed on the outer side wall of the protection tube, and each air hole is arranged corresponding to one end of the gas through groove, each air hole is provided with a dust blocking portion arranged corresponding to the sensor probe, and the dust blocking portion is integrally formed with the inner wall of the air hole;

[0005] Furthermore, a mounting seat is provided at the bottom end of the protection tube, the protection tube is detachably connected to the mounting seat, the bottom end of the shell is inserted on the mounting seat, and the shell is detachably connected to the mounting seat;

[0006] Furthermore, the dust blocking portion is two dust blocking ribs, which are relatively parallelly arranged in the air passage along the center line of the width direction of the gas passage, and both ends of each dust blocking rib are integrally formed with the inner wall of the air passage;

[0007] Furthermore, the ratio of the width dimension of the dust blocking rib to the end face diameter dimension of the sensor probe is 4:3;

[0008] Furthermore, the two dust-blocking ribs divide the air passage into three air passage areas, the air passage area between the two dust-blocking ribs is the gap air passage area, the air passage area between each dust-blocking rib and the inner wall of the air passage is the main air passage area, and the ratio between the width dimension of the main air passage area and the width dimension of the air passage is 1:2.5-3;

[0009] Further, the dust blocking portion is a dust blocking rib, which is arranged at the center of the air passage along the length extension direction of the sensor probe, and both ends of the dust blocking rib are integrally formed with the inner wall of the air passage;

[0010] Furthermore, the dust-blocking ribs divide the air passage into two main air passage areas, and the ratio between the width of the main air passage area and the width of the air passage is 1:2.2-2.4;

[0011] The beneficial effects of this application compared to the prior art are as follows:

[0012] The present application proposes a thermal gas mass flowmeter sensor with a dust protection structure. Compared with the traditional sensor structure, the present application adds a protection tube structure on the outside of the sensor housing, and connects the protection tube structure to the sensor housing through a mounting seat. Such a configuration enables the protection tube to still move synchronously with the sensor in a large-section air duct, thereby increasing the stability of the protection tube structure during operation and the accuracy of the coordination between the protection tube and the sensor. The component in the protection tube that protects the sensor probe is a fin structure, which is arranged corresponding to the probe structure in the sensor, and can effectively block dust particles mixed in the large-flow airflow in the pipeline, effectively avoiding the dust particles from directly hitting the probe under the action of high-speed airflow, while blocking the dust particles. The movement speed of the dust particles is also reduced, reducing the surface wear of the probe structure, and indirectly extending the service life of the sensor probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an axial schematic diagram of the sensor structure described in Example 1;

[0014] Figure 2 It is a schematic axial cross-sectional view of the sensor structure described in Example 1;

[0015] Figure 3 This is an axial schematic diagram of the protection tube in the sensor structure described in Example 1;

[0016] Figure 4 This is a schematic axial view of the sensor in the sensor structure described in Example 1;

[0017] Figure 5 This is an axial schematic diagram of the sensor structure described in Example 2;

[0018] Figure 6 It is a schematic axial cross-sectional view of the sensor structure described in Example 2;

[0019] Figure 7 This is an axial schematic diagram of the protection tube in the sensor structure of the second embodiment;

[0020] Figure 8 This is a schematic diagram of the axial side of the sensor in the sensor structure of the second embodiment;

[0021] In the figure, 1 is a housing, 11 is a gas through slot, 2 is a sensor probe, 3 is a protective tube, 4 is a mounting base and 5 is a sensor mounting tube in a thermal gas mass flow meter. DETAILED DESCRIPTION

[0022] Specific implementation method 1: Combination Figures 1 to 4 The present embodiment is described. In the present embodiment, a thermal gas mass flow meter sensor with a dust protection structure is provided. The thermal gas mass flow meter sensor comprises a housing 1 and N sensor probes 2, where N is a positive integer. A gas through groove 11 arranged along the extension direction of the pipeline length is processed on the outer circumferential surface of the housing 1, and the N sensor probes 2 are all arranged in the gas through groove 11, and one end of each sensor probe 2 is inserted into the inner top of the housing, and a gap is provided between the other end of each sensor probe 2 and the inner bottom of the gas through groove 11. The thermal gas mass flow meter sensor also comprises a protection tube 3, which is sleeved on the outer side of the housing 1, and the protection tube 3 is coaxially arranged with the housing 1, one end of the protection tube 3 is detachably connected to the shell of the thermal gas mass flow meter, two air holes are processed on the outer side wall of the protection tube 3, and each air hole is arranged corresponding to one end of a gas through groove 11, and each air hole is provided with a dust blocking portion arranged corresponding to the sensor probe 2, and the dust blocking portion is integrally formed with the inner wall of the air hole;

[0023] The bottom end of the protection tube 3 is provided with a mounting seat 4, the protection tube 3 is detachably connected to the mounting seat 4, the bottom end of the housing 1 is inserted on the mounting seat, and the housing 1 is detachably connected to the mounting seat;

[0024] The dust blocking part is two dust blocking ribs 31, which are relatively parallel and arranged in the air passage along the center line of the width direction of the gas passage 11, and both ends of each dust blocking rib 31 are integrally formed with the inner wall of the air passage;

[0025] The ratio of the width of the dust blocking rib 31 to the end diameter of the sensor probe 2 is 4:3;

[0026] The two dust-blocking ribs 31 divide the air hole into three air flow areas. The air flow area between the two dust-blocking ribs 31 is a gap air flow area 32. The air flow area between each dust-blocking rib 31 and the inner wall of the air hole is a main air flow area 33. The ratio between the width dimension of the main air flow area 33 and the width dimension of the air hole is 1:2.5-3.

[0027] The sensor to be protected in this embodiment is a double-probe sensor. The double probes are of equal length, and the two probes in the sensor are arranged toward the gas flow direction. For the protection of the sensor probes of this structure, this embodiment adopts a double dust-blocking rib design, so that each dust-blocking rib in each air hole is arranged corresponding to a probe structure. In this way, when the airflow carrying dust passes through the sensor, the dust-blocking rib will be impacted by the airflow before the sensor probe, which effectively buffers the highly moving airflow. At the same time, in the buffering process, it will also block the dust particles that were originally going to contact the front of the probe to avoid the dust particles contacting the probe with the airflow and causing scratches on the probe surface. It is worth mentioning It should be noted that in order to ensure the success rate of dust blocking, the width of the dust blocking ribs should be larger than the end diameter of the sensor probe, and the preferred ratio is 4:3. At the same time, the main airflow area of ​​the protective tube in this form is the ventilation area of ​​the main airflow area. In order to ensure that the airflow can pass through the working range of the sensor smoothly, the ventilation area of ​​the main airflow area should reach 65% to 80% of the overall area of ​​the air holes. When the sensor to be protected is a multi-probe structure and the multiple probes are facing the wind, this type of protective tube structure can also be used for protection. However, the number of dust blocking ribs should be reasonably increased according to the number of probes, and the area of ​​the airflow area should be appropriately adjusted to avoid blockage.

[0028] Specific implementation method 2: Combination Figures 5 to 8The present embodiment is described. In the present embodiment, a thermal gas mass flow meter sensor with a dust protection structure is provided. The thermal gas mass flow meter sensor comprises a housing 1 and N sensor probes 2, where N is a positive integer. A gas through groove 11 arranged along the extension direction of the pipeline length is processed on the outer circumferential surface of the housing 1, and the N sensor probes 2 are all arranged in the gas through groove 11, and one end of each sensor probe 2 is inserted into the inner top of the housing, and a gap is provided between the other end of each sensor probe 2 and the inner bottom of the gas through groove 11. The thermal gas mass flow meter sensor also comprises a protection tube 3, which is sleeved on the outer side of the housing 1, and the protection tube 3 is coaxially arranged with the housing 1, one end of the protection tube 3 is detachably connected to the shell of the thermal gas mass flow meter, two air holes are processed on the outer side wall of the protection tube 3, and each air hole is arranged corresponding to one end of a gas through groove 11, and each air hole is provided with a dust blocking portion arranged corresponding to the sensor probe 2, and the dust blocking portion is integrally formed with the inner wall of the air hole;

[0029] The bottom end of the protection tube 3 is provided with a mounting seat 4, the protection tube 3 is detachably connected to the mounting seat 4, the bottom end of the housing 1 is inserted on the mounting seat, and the housing 1 is detachably connected to the mounting seat;

[0030] The dust blocking portion is a dust blocking rib 31, which is arranged at the center of the air passage along the length extension direction of the sensor probe 2, and both ends of the dust blocking rib 31 are integrally formed with the inner wall of the air passage;

[0031] The ratio of the width of the dust blocking rib 31 to the end diameter of the sensor probe 2 is 4:3;

[0032] The dust blocking rib 31 divides the air passage into two main air passage areas 33, and the ratio between the width of the main air passage area 33 and the width of the air passage is 1:2.2-2.4.

[0033] The sensor to be protected in this embodiment is also a dual-probe sensor, which is different from the sensor structure in the first embodiment. The dual probes on the sensor in this embodiment are arranged in sequence along the airflow direction, and the lengths of the dual probes are different. The dual probes on the sensor in this embodiment are arranged to block each other, that is, only one complete probe structure can be seen from the direction of the airflow direction. Therefore, the design of a single dust-blocking rib is adopted in this embodiment, so that the dust-blocking rib in each air hole is arranged corresponding to the first complete probe structure that can be seen in the airflow direction. The principle is also to block the airflow carrying dust. When the airflow carrying dust passes through the sensor, the dust-blocking rib is The dust ribs will be impacted by the airflow before the sensor probes, effectively buffering the highly moving airflow. At the same time, during the buffering process, they will also block the dust particles that are originally going to contact the front of the probe, preventing the dust particles from scratching the probe surface due to contact with the probe with the airflow. It is worth noting that since the double probes in this embodiment are arranged in sequence, the probe in the front will also block the dust for the probe in the rear, and the width of the dust blocking ribs is wider than the width of the probe. Therefore, this result is relatively more protective for the probe in the rear. When the sensor structure to be protected is a single probe, this protective tube structure can also be used for protection.

[0034] The present invention has been disclosed as above with preferred implementation cases, but it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0035] How it works

[0036] The present application provides a thermal gas mass flow meter sensor with a dust protection structure. When working, the sensor is first set in the target pipeline, and the protection tube 3 is mounted on the outer side of the sensor housing 1, while ensuring that the dust-blocking ribs 31 in the protection tube 3 can effectively block each sensor probe 2 in the sensor. When the airflow carrying dust particles flows through the area where the sensor is located in the pipeline, the dust-blocking ribs 31 will be impacted by the airflow before the sensor probe 2, effectively buffering the highly moving airflow. At the same time, during the buffering process, the dust particles that were originally going to contact the front of the probe are blocked, so as to avoid the dust particles from scratching the probe surface due to the contact between the airflow and the probe. The blocked airflow will continue to flow along the wind-passing areas on both sides of the dust-blocking ribs 31. Since the width of the dust-blocking ribs 31 is wider than the width of the sensor probe 2, the dust particles carried in the airflow passing through the wind-passing area will not contact the sensor probe 2 at a higher flow rate, thereby minimizing the wear of the sensor probe 2 by the dust particles in the airflow, and indirectly improving the service life of the sensor probe 2.

Claims

1. A thermal gas mass flow meter sensor with a dust protection structure, the thermal gas mass flow meter sensor comprising a housing (1) and N sensor probes (2), N being a positive integer, a gas through groove (11) arranged along the extension direction of the pipeline length is processed on the outer circumferential surface of the housing (1), the N sensor probes (2) are all arranged in the gas through groove (11), and one end of each sensor probe (2) is inserted into the inner top of the housing, and a gap is arranged between the other end of each sensor probe (2) and the inner bottom of the gas through groove (11), characterized in that: The thermal gas mass flow meter sensor also includes a protection tube (3), the protection tube (3) is sleeved on the outer side of the housing (1), and the protection tube (3) and the housing (1) are coaxially arranged, one end of the protection tube (3) is detachably connected to the shell of the thermal gas mass flow meter, two air holes are processed on the outer wall of the protection tube (3), and each air hole is arranged corresponding to one end of the gas through groove (11), each air hole is provided with a dust blocking portion arranged corresponding to the sensor probe (2), and the dust blocking portion is formed integrally with the inner wall of the air hole.

2. The thermal gas mass flowmeter sensor with a dust protection structure according to claim 1, characterized in that: The bottom end of the protection tube (3) is provided with a mounting seat (4), the protection tube (3) and the mounting seat (4) are detachably connected, the bottom end of the outer shell (1) is pressed against the mounting seat, and the outer shell (1) and the mounting seat are detachably connected.

3. A thermal gas mass flowmeter sensor with a dust protection structure according to claim 1 or 2, characterized in that: The dust blocking portion is two dust blocking ribs (31), which are arranged relatively parallel in the air passage along the center line of the width direction of the gas passage (11), and both ends of each dust blocking rib (31) are integrally formed with the inner wall of the air passage.

4. The thermal gas mass flowmeter sensor with a dust protection structure according to claim 3, characterized in that: The ratio of the width dimension of the dust blocking rib (31) to the end face diameter dimension of the sensor probe (2) is 4:

3.

5. The thermal gas mass flowmeter sensor with a dust protection structure according to claim 3, characterized in that: The two dust-blocking ribs (31) divide the air passage into three air passage areas, the air passage area between the two dust-blocking ribs (31) is a gap air passage area (32), the air passage area between each dust-blocking rib (31) and the inner wall of the air passage is a main air passage area (33), and the ratio between the width dimension of the main air passage area (33) and the width dimension of the air passage is 1:2.5-3.

6. A thermal gas mass flowmeter sensor with a dust protection structure according to claim 1 or 2, characterized in that: The dust blocking portion is a dust blocking rib (31), which is arranged at the center of the air passage along the length extension direction of the sensor probe (2), and both ends of the dust blocking rib (31) are integrally formed with the inner wall of the air passage.

7. The thermal gas mass flowmeter sensor with a dust protection structure according to claim 6, characterized in that: The ratio of the width dimension of the dust blocking rib (31) to the end face diameter dimension of the sensor probe (2) is 4:

3.

8. The thermal gas mass flowmeter sensor with a dust protection structure according to claim 5, characterized in that: The dust blocking rib (31) divides the air passage into two main air passage areas (33), and the ratio between the width of the main air passage area (33) and the width of the air passage is 1:2.2-2.4.

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