Inlet air duct assembly of coal mill

Abstract

The utility model relates to an inlet air duct assembly of a coal mill, the inlet air duct assembly comprises an air duct body, a connecting pipe, an air volume monitoring part and a fixing assembly, the connecting pipe is arranged on one side of the air duct body in the radial direction and communicates with the air duct body, and the air volume monitoring part is used for measuring the air speed of the inlet air duct; one end of the air volume monitoring component is located on the outer side of the connecting pipe, the other end of the air volume monitoring component extends into the air duct body through the connecting pipe, and the fixing assembly is arranged on the connecting pipe and used for detachably connecting the air volume monitoring component to the connecting pipe. On one hand, the fixing effect of the air volume monitoring component on the inlet air duct is good, the air volume monitoring component is not prone to shaking, the air volume monitoring component can be detached from the air duct body without detaching the whole inlet air duct assembly, and the air volume monitoring component is easy to detach from the air duct body.

Description

Technical Field

[0001] The present disclosure relates to the technical field of coal mill inlet air volume measurement, and in particular to an inlet air duct assembly of a coal mill. Background Art

[0002] A coal mill is a mechanical device that breaks up coal into powder. Air volume is a crucial parameter for its operation. To ensure proper operation, accurate measurement of air volume at the mill inlet is essential.

[0003] In the related art, an air volume monitoring component is usually set in the inlet air duct of the coal mill and fixed by a fixing part. Since both the fixing part and the air volume monitoring component need to be set in the inlet air duct, the entire inlet air duct needs to be disassembled to realize the disassembly and assembly of the air volume detection device. The disassembly and assembly of the air volume detection device in the inlet air duct is relatively complicated. Utility Model Content

[0004] The purpose of the present disclosure is to provide an inlet air duct assembly for a coal mill to solve the problems existing in the related art.

[0005] The present disclosure provides an inlet air duct assembly for a coal mill, comprising:

[0006] An air duct body and a connecting pipe, wherein the connecting pipe is arranged on one side of the air duct body in a radial direction and is in communication with the air duct body;

[0007] an air volume monitoring component for measuring the wind speed of the inlet air duct, wherein one end of the air volume monitoring component is located outside the connecting tube, and the other end of the air volume monitoring component extends into the air duct body through the connecting tube; and

[0008] A fixing assembly is provided on the connecting pipe, and the fixing assembly is used to detachably connect the air volume monitoring component to the connecting pipe.

[0009] Optionally, the fixing assembly includes a first connecting member and a fixing member, the first connecting member is used to be connected to the air volume monitoring component, a limiting blind hole is opened on the inner wall of the connecting pipe, and the fixing member is constructed to be able to move back and forth along the radial direction of the first connecting member so that the fixing member can be inserted into the limiting blind hole, or, be removed from the limiting blind hole.

[0010] Optionally, the fixing assembly further includes a second connecting member, the first connecting member is configured as a cylindrical member, and the second connecting member is inserted into the first connecting member along the axial direction of the first connecting member;

[0011] In which, a limiting hole is provided on the side wall of the first connecting member, and the fixing member is slidably arranged in the limiting hole. A spiral groove is provided on the second connecting member, and a clamping foot is provided on the fixing member. The clamping foot is used to cooperate with the spiral groove so that the fixing member can move in a direction toward or away from the limiting blind hole under the rotation action of the second connecting member.

[0012] Optionally, the fixing member includes an inserting portion and a matching portion provided on a side of the fixing member body away from the limiting blind hole, and the inserting portion is used to be inserted into the limiting blind hole;

[0013] The clamping foot is arranged on a side of the matching portion close to the second connecting member, and along the radial direction of the first connecting member, a projected area of ​​a cross section of the matching portion is larger than a cross-sectional area of ​​the limiting hole.

[0014] Optionally, there are multiple fixing members, and the multiple fixing members are arranged at intervals along the circumference of the first connecting member.

[0015] Optionally, the air volume monitoring component includes a sampling tube, and an external thread is provided on the outer peripheral surface of the sampling tube;

[0016] The second connecting member includes a connecting plate and a connecting portion arranged on the connecting plate, the spiral groove is arranged on the connecting plate, a threaded hole is opened on the connecting portion, and at least a portion of the sampling tube can pass through the threaded hole and be threadedly connected to the threaded hole.

[0017] Optionally, the fixing assembly further includes a bearing, an inner ring of the bearing is sleeved on the connecting portion, and an outer ring of the bearing is inserted into the first connecting member.

[0018] Optionally, the inlet air duct assembly also includes a sealing member, and a step surface is provided on the inner wall of the connecting pipe, and a limiting groove is provided on the step surface. The side of the first connecting member close to the air duct body can be at least partially inserted into the limiting groove and press against the sealing member, and the sealing member is used to seal the gap between the connecting pipe and the first connecting member.

[0019] Optionally, the fixing assembly further includes a third connecting member and an elastic member, and the third connecting member is inserted into the first connecting member;

[0020] The third connecting member is provided with a plurality of protrusions, which are arranged at intervals along the circumference of the third connecting member. The inner wall of the connecting pipe is provided with a stepped surface, and the stepped surface is provided with a plurality of position-limiting holes, and the plurality of position-limiting holes are arranged in a one-to-one correspondence with the plurality of protrusions.

[0021] The elastic member is arranged in the limiting clamping hole, and the plurality of protrusions can be respectively inserted into the corresponding limiting clamping holes and abut against the elastic member.

[0022] Optionally, the inlet air duct assembly further includes an adjusting handle and a fixing bolt, and one end of the sampling tube located outside the connecting tube is passed through the adjusting handle, and the fixing bolt is used to fix the adjusting handle on the sampling tube.

[0023] Through the above technical solution, since the air volume monitoring component is detachably fixed to the connecting pipe through the fixing component, on the one hand, the fixing component can reliably fix the air volume monitoring component to the air duct body, the air volume monitoring component has a better fixing effect on the inlet air duct, and the air volume monitoring component is not easy to shake. Moreover, when the air volume monitoring component needs to be inspected and maintained, it is only necessary to remove the fixing component from the connecting pipe. The air volume monitoring component can be removed from the air duct body without removing the entire inlet air duct assembly. The disassembly and assembly of the air volume monitoring component on the air duct body is relatively simple.

[0024] Furthermore, because the air volume monitoring component extends into the air duct body via a connecting tube, only a portion of the component (i.e., the portion of the component intended to come into contact with the airflow) comes into contact with the airflow flowing through the inlet duct. The fixing assembly securing the component and the remaining portion of the component (the portion not in contact with the airflow) do not obstruct the airflow through the inlet duct, allowing the duct body to flow a relatively large amount of air. This also effectively prevents the fixing assembly and other portions of the component from being impacted by the air-dust mixture in the duct, which could damage them, effectively extending their service life.

[0025] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of an inlet air duct assembly provided by an exemplary embodiment of the present disclosure.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the air duct body and the connecting pipe provided in an exemplary embodiment of the present disclosure.

[0029] Figure 3It is a schematic exploded view of the three-dimensional structure of a fixing assembly provided in an exemplary embodiment of the present disclosure.

[0030] Figure 4 is a schematic exploded view of a three-dimensional structure of a fixing assembly provided by an exemplary embodiment of the present disclosure, wherein Figure 3 Different perspective.

[0031] Description of Reference Numerals

[0032] 100-inlet air duct assembly; 10-air duct body; 20-connecting pipe; 21-limiting blind hole; 22-step surface; 221-limiting card hole; 23-limiting slot; 30-air volume monitoring component; 40-fixing component; 41-first connecting part; 411-limiting hole; 42-fixing part; 421-plug-in part; 422-matching part; 4221-card foot; 43-second connecting part; 431-connecting plate; 432-connecting part; 4321-threaded hole; 433-spiral groove; 44-third connecting part; 441-protrusion; 45-elastic part; 50-sealing part; 60-adjusting handle; 70-fixing bolt. DETAILED DESCRIPTION

[0033] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0034] In the present disclosure, it should be understood that the directional words used, such as "upper" and "lower", are defined based on the drawing directions of the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, and a specific orientation structure and operation. Therefore, they cannot be understood as limitations on the present disclosure. The terms "inside" and "outside" refer to the inside and outside of the corresponding structural outline. In addition, it should be noted that the terms used, such as "first" and "second", are used to distinguish one element from another and do not have sequentiality or importance. In addition, in the description of the reference drawings, the same mark in different drawings represents the same element.

[0035] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; and they may refer to direct connections or indirect connections via an intermediary. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0036] like Figures 1 to 4As shown, the present disclosure provides an inlet air duct assembly 100 of a coal mill, including an air duct body 10, a connecting pipe 20, an air volume monitoring component 30 and a fixing component 40. The connecting pipe 20 is arranged on one side of the air duct body 10 along the radial direction, and the connecting pipe 20 is connected to the air duct body 10. The air volume monitoring component 30 is used to measure the wind speed of the inlet air duct. One end of the air volume monitoring component 30 is located on the outside of the connecting pipe 20, and the other end of the air volume monitoring component 30 extends into the air duct body 10 through the connecting pipe 20. The fixing component 40 is arranged on the connecting pipe 20, and the fixing component 40 is used to detachably connect the air volume monitoring component 30 to the connecting pipe 20.

[0037] In the above-mentioned inlet air duct assembly, since one side of the air volume monitoring component 30 is located on the outside of the connecting pipe 20 and the other end of the air volume monitoring component 30 can be extended into the air duct body 10, one side of the air volume monitoring component 30 can be connected to other equipment (such as a control device) arranged on the outside of the inlet air duct, and the other side of the air duct monitoring component 30 can at least partially extend into the air duct body 10. The monitoring part of the air duct monitoring component can contact the airflow flowing through the air duct body 10, thereby obtaining the wind speed and air volume of the coal mill inlet air duct.

[0038] Through the above technical solution, since the air volume monitoring component 30 is detachably fixed to the connecting pipe 20 by the fixing component 40, on the one hand, the fixing component 40 can reliably fix the air volume monitoring component 30 on the air duct body 10, the air volume monitoring component 30 has a better fixing effect on the inlet air duct, and the air volume monitoring component 30 is not easy to shake. Moreover, when the air volume monitoring component 30 needs to be inspected and maintained, it is only necessary to remove the fixing component 40 from the connecting pipe 20. The air volume monitoring component 30 can be removed from the air duct body 10 without dismantling the entire inlet air duct assembly. The disassembly and assembly of the air volume monitoring component 30 on the air duct body 10 is relatively simple.

[0039] Furthermore, since the air volume monitoring component 30 extends into the air duct body 10 via the connecting tube 20, in other words, only a portion of the air volume monitoring component 30 (i.e., the portion of the air volume monitoring component 30 that contacts the airflow) contacts the airflow flowing through the inlet air duct. The fixing assembly 40 for securing the air volume monitoring component 30 and the remaining portions of the air volume monitoring component 30 (the portions not in contact with the airflow) do not obstruct the airflow through the inlet air duct, allowing the air duct body 10 to pass a relatively large flow of air. This also effectively prevents the fixing assembly 40 and other portions of the air volume monitoring component 30 from being impacted by the air-powder mixture in the duct, which could easily damage the fixing assembly 40 and the air volume monitoring component 30, thereby effectively extending the service life of the fixing assembly 40 and the air volume monitoring component 30.

[0040] The present disclosure does not limit the specific structure of the connecting pipe 20 and the fixing assembly 40, as long as the fixing assembly 40 can reliably fix the air volume monitoring component 30 on the connecting pipe 20 and facilitate disassembly and assembly. As an embodiment of the present disclosure, Figure 1 、 Figure 3 and Figure 4 As shown, the fixing assembly 40 includes a first connecting member 41 and a fixing member 42. The first connecting member 41 is used to be connected to the air volume monitoring component 30. A limiting blind hole 21 is opened on the inner wall of the connecting pipe 20. The fixing member 42 is constructed to be able to move back and forth along the radial direction of the first connecting member 41 so that the fixing member 42 can be inserted into the limiting blind hole 21, or be removed from the limiting blind hole 21.

[0041] That is to say, it is only necessary to insert the first connecting member 41 in the fixing assembly 40 into the connecting pipe 20 and insert the fixing member 42 into the limiting blind hole 21 set on the inner wall of the connecting pipe 20, so as to achieve the fixation of the air volume monitoring component 30 on the inlet air duct of the coal mill. The installation of the air volume monitoring component 30 on the inlet air duct is relatively simple and the fixing effect is better.

[0042] In addition, when the air volume monitoring component 30 is to be inspected and repaired, or when the air volume monitoring component 30 needs to be removed from the inlet air duct, it is only necessary to remove the fixing part 42 from the limiting blind hole 21 on the inner wall of the connecting pipe 20, and then the first connecting part 41 can be removed, and the air volume monitoring component 30 can be removed. The disassembly of the air volume monitoring component 30 and the fixing part 42 on the connecting pipe 20 is also relatively simple.

[0043] As another embodiment of the present disclosure, the inner side of the connecting tube 20 may be provided with an internal thread, and the outer side of the first connecting member 41 may be provided with an external thread, and the air volume monitoring component 30 may be connected to the first connecting member 41. In this way, the air volume monitoring component 30 can be securely fixed to the inlet air duct by simply threading the first connecting member 41 and the connecting tube 20.

[0044] In order to facilitate the insertion of the fixing member 42 into the limiting blind hole 21, or to remove the fixing member 42 from the limiting blind hole 21, optionally, as Figure 1 、 Figure 3 and Figure 4As shown, the fixing assembly 40 also includes a second connecting member 43, the first connecting member 41 is constructed as a cylindrical member, and the second connecting member 43 is inserted into the first connecting member 41 along the axial direction of the first connecting member 41, wherein a limiting hole 411 is opened on the side wall of the first connecting member 41, and the fixing member 42 is slidably set in the limiting hole 411, and a spiral groove 433 is opened on the second connecting member 43, and a clamping foot 4221 is provided on the fixing member 42, and the clamping foot 4221 is used to cooperate with the spiral groove 433, so that the fixing member 42 can move in the direction toward or away from the limiting blind hole 21 under the rotation action of the second connecting member 43.

[0045] Since a limiting hole 411 is provided on the side wall of the first connecting member 41, a spiral groove 433 is provided on the second connecting member 43, and a clamping foot 4221 that cooperates with the spiral groove 433 is provided on the fixing member 42. In this way, when the second connecting member 43 is rotated, due to the limiting effect of the limiting hole 411, the fixing member 42 can only move toward the direction close to Mr. Hu and away from the limiting blind hole 21 under the action of the clamping foot 4221 and the spiral groove 433, so that the fixing member 42 is inserted into the limiting blind hole 21, or is removed from the limiting blind hole 21, thereby realizing the locking of the fixing assembly 40 on the connecting pipe 20, or removing the fixing assembly 40 from the connecting pipe 20.

[0046] Alternatively, as Figures 3 and 4 As shown, the fixing member 42 includes a plug-in portion 421 and a matching portion 422 arranged on the side of the fixing member 42 body away from the limiting blind hole 21, the plug-in portion 421 is used to insert into the limiting blind hole 21, and the clamping foot 4221 is arranged on the side of the matching portion 422 close to the second connecting member 43, and along the radial direction of the first connecting member 41, the projected area of ​​the cross section of the matching portion 422 is larger than the cross-sectional area of ​​the limiting hole 411.

[0047] Since the projected area of ​​the cross section of the fitting portion 422 along the radial direction of the first connecting member 41 is larger than the cross-sectional area of ​​the limiting hole 411, in other words, at least a portion of the fitting portion 422 of the fixing member 42 protrudes outward from the limiting hole 411. In this way, when the fixing member 42 moves toward the limiting blind hole 21 under the action of the second connecting member 43, the limiting hole 411 can also limit the fixing member 42, effectively avoiding the fixing member 42 from always moving toward the limiting blind hole 21 and escaping from the second connecting member 43, resulting in the fixing assembly 40 being unable to fix the air volume monitoring component 30 on the connecting pipe 20.

[0048] In order to improve the fixing effect of the fixing assembly 40 on the connecting pipe 20, optionally, as Figure 3 and Figure 4As shown, there are multiple fixing members 42, and the multiple fixing members 42 are arranged at intervals along the circumference of the first connecting member 41. The multiple fixing members 42 arranged at intervals along the circumference of the first connecting member 41 can all have a fixing effect on the first connecting member 41, and the first connecting member 41 is reliably fixed on the connecting pipe 20.

[0049] The present disclosure does not limit the specific type of the air volume monitoring component 30, nor the specific connection relationship between the air volume monitoring component 30 and the fixing assembly 40. As an embodiment of the present disclosure, Figure 1 As shown, the air volume monitoring component 30 includes a sampling tube having an external thread on its outer circumferential surface. The second connecting member 43 includes a connecting plate 431 and a connecting portion 432 disposed on the connecting plate 431. A spiral groove 433 is disposed on the connecting plate 431. The connecting portion 432 has a threaded hole 4321 formed therein. At least a portion of the sampling tube can pass through the threaded hole 4321 and be threadedly connected thereto. Because the sampling tube is connected to the second connecting member 43 via a threaded connection, the connection between the sampling tube and the second connecting member 43 is secure, and the sampling tube is not easily shaken, effectively preventing the sampling tube from shaking, which could result in errors in the wind speed and air volume of the inlet air duct measured by the sampling tube.

[0050] Here, it should be noted that the present disclosure does not limit the specific number of the air volume monitoring components 30. As an embodiment of the present disclosure, Figure 2 As shown, there can be two air volume monitoring components 30, which are spaced apart. The two air volume monitoring components 30 can simultaneously measure the wind speed and air volume of the inlet air duct, which is beneficial to improving the measurement accuracy of the wind speed and air volume of the inlet air duct.

[0051] In order to reduce the friction between the first connecting member 41 and the second connecting member 43 when the second connecting member 43 rotates, the fixing assembly 40 may optionally further include a bearing, the inner ring of the bearing being sleeved on the connecting portion 432, and the outer ring of the bearing being inserted into the first connecting member 41. In this way, when the second connecting member 43 needs to be rotated to move the fixing member 42 toward or away from the limiting blind hole 21, the first connecting member 41 and the second connecting member 43 do not rub against each other, and the friction between the first connecting member 41 and the second connecting member 43 is relatively small. On the one hand, only a small force is required to achieve the rotation of the second connecting member 43; on the other hand, the friction between the first connecting member 41 and the second connecting member 43 is avoided, which may cause the first connecting member 41 and / or the second connecting member 43 to be easily worn due to the large friction between the first connecting member 41 and the second connecting member 43, thereby effectively improving the service life of the first connecting member 41 and the second connecting member 43.

[0052] In order to prevent the air flow in the inlet air duct from leaking from the connection between the fixing assembly 40 and the connecting pipe 20, optionally, as Figures 2 to 4As shown, the inlet air duct assembly 100 may further include a sealing member 50. A stepped surface 22 is further provided on the inner wall of the connecting pipe 20. The stepped surface 22 defines a limiting groove 23. The side of the first connecting member 41 close to the air duct body 10 can be at least partially inserted into the limiting groove 23 and abut against the sealing member 50. The sealing member 50 is used to seal the gap between the connecting pipe 20 and the first connecting member 41. In other words, the sealing member 50 abuts between the connecting pipe 20 and the first connecting member 41. The sealing member 50 can seal the gap between the connecting pipe 20 and the first connecting member 41, thereby preventing the airflow flowing through the inlet air duct from leaking from the connection between the connecting pipe 20 and the fixing assembly 40, which would cause the actual air volume obtained by the coal mill to be less than the air volume blown into the coal mill, thereby avoiding air volume loss.

[0053] In order to further facilitate the removal of the fixing assembly 40 and / or the air volume monitoring component 30 from the connecting pipe 20, optionally, as Figures 2 to 4 As shown, the fixing assembly 40 also includes a third connecting member 44 and an elastic member 45. The third connecting member 44 is inserted into the first connecting member 41. A plurality of protrusions 441 are provided on the third connecting member 44. The plurality of protrusions 441 are arranged at circumferential intervals along the third connecting member 44. A step surface 22 is provided on the inner wall of the connecting tube 20. A plurality of limiting holes 221 are opened on the step surface 22. The plurality of limiting holes 221 are arranged in a one-to-one correspondence with the plurality of protrusions 441. The elastic member 45 is arranged in the limiting hole 221. The plurality of protrusions 441 can be respectively inserted into the corresponding limiting holes 221 and press against the elastic member 45. Since the multiple protrusions 441 all press against the elastic member 45, when the fixing member 42 arranged on the first connecting member 41 is disengaged from the limiting blind hole 21 on the connecting pipe 20, the elastic force of the elastic member 45 reacts on the third connecting member 44 to push out the entire fixing member 42 and the air volume monitoring component 30, thereby facilitating the disassembly of the fixing assembly 40 and / or the air volume monitoring component 30.

[0054] In order to facilitate the rotation of the second connecting member 43, thereby inserting the fixing member 42 into the limiting blind hole 21, or removing the fixing member 42 from the limiting blind hole 21, optionally, as Figure 1 As shown, the inlet duct assembly 100 also includes an adjustment handle 60 and a fixing bolt 70. The end of the sampling tube located outside the connecting tube 20 is inserted into the adjustment handle 60, and the fixing bolt 70 is used to secure the adjustment handle 60 to the sampling tube. Thus, by rotating the adjustment handle 60, the second connecting member 43 can be rotated, thereby inserting the fixing member 42 into the limiting blind hole 21 or removing the fixing member 42 from the limiting blind hole 21, thereby securing the fixing assembly 40 to the connecting tube 20, which is relatively convenient to operate.

[0055] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0057] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An inlet air duct assembly for a coal mill, characterized in that: include: An air duct body and a connecting pipe, wherein the connecting pipe is arranged on one side of the air duct body in a radial direction and is in communication with the air duct body; an air volume monitoring component for measuring the wind speed of the inlet air duct, wherein one end of the air volume monitoring component is located outside the connecting tube, and the other end of the air volume monitoring component extends into the air duct body through the connecting tube; and A fixing assembly is provided on the connecting pipe, and the fixing assembly is used to detachably connect the air volume monitoring component to the connecting pipe.

2. The inlet air duct assembly according to claim 1, characterized in that: The fixing assembly includes a first connecting member and a fixing member, the first connecting member is used to be connected to the air volume monitoring component, a limiting blind hole is opened on the inner wall of the connecting pipe, and the fixing member is constructed to be able to move back and forth along the radial direction of the first connecting member so that the fixing member can be inserted into the limiting blind hole, or be removed from the limiting blind hole.

3. The inlet air duct assembly according to claim 2, characterized in that: The fixing assembly further includes a second connecting member, the first connecting member is configured as a cylindrical member, and the second connecting member is inserted into the first connecting member along the axial direction of the first connecting member; In which, a limiting hole is provided on the side wall of the first connecting member, and the fixing member is slidably arranged in the limiting hole. A spiral groove is provided on the second connecting member, and a clamping foot is provided on the fixing member. The clamping foot is used to cooperate with the spiral groove so that the fixing member can move in a direction toward or away from the limiting blind hole under the rotation action of the second connecting member.

4. The inlet air duct assembly according to claim 3, characterized in that: The fixing member includes an inserting portion and a matching portion provided on a side of the fixing member body away from the limiting blind hole, wherein the inserting portion is used to be inserted into the limiting blind hole; The clamping foot is arranged on a side of the matching portion close to the second connecting member, and along the radial direction of the first connecting member, a projected area of ​​a cross section of the matching portion is larger than a cross-sectional area of ​​the limiting hole.

5. The inlet air duct assembly according to any one of claims 2 to 4, characterized in that: There are multiple fixing members, and the multiple fixing members are arranged at intervals along the circumference of the first connecting member.

6. The inlet air duct assembly according to claim 3, characterized in that: The air volume monitoring component includes a sampling tube, and an external thread is provided on the outer peripheral surface of the sampling tube; The second connecting member includes a connecting plate and a connecting portion arranged on the connecting plate, the spiral groove is arranged on the connecting plate, a threaded hole is opened on the connecting portion, and at least a portion of the sampling tube can pass through the threaded hole and be threadedly connected to the threaded hole.

7. The inlet air duct assembly according to claim 6, characterized in that: The fixing assembly further includes a bearing, an inner ring of the bearing is sleeved on the connecting portion, and an outer ring of the bearing is inserted into the first connecting piece.

8. The inlet air duct assembly according to claim 7, characterized in that: The inlet air duct assembly also includes a sealing member, and a step surface is provided on the inner wall of the connecting pipe, and a limiting groove is provided on the step surface. The side of the first connecting member close to the air duct body can be at least partially inserted into the limiting groove and press against the sealing member, and the sealing member is used to seal the gap between the connecting pipe and the first connecting member.

9. The inlet air duct assembly according to claim 2, characterized in that: The fixing assembly further includes a third connecting member and an elastic member, wherein the third connecting member is inserted into the first connecting member; The third connecting member is provided with a plurality of protrusions, which are arranged at intervals along the circumference of the third connecting member. The inner wall of the connecting pipe is provided with a stepped surface, and the stepped surface is provided with a plurality of position-limiting holes, and the plurality of position-limiting holes are arranged in a one-to-one correspondence with the plurality of protrusions. The elastic member is arranged in the limiting clamping hole, and the plurality of protrusions can be respectively inserted into the corresponding limiting clamping holes and abut against the elastic member.

10. The inlet air duct assembly according to claim 6, characterized in that: The inlet air duct assembly also includes an adjustment handle and a fixing bolt. The end of the sampling tube located outside the connecting tube is passed through the adjustment handle. The fixing bolt is used to fix the adjustment handle on the sampling tube.

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