An IO-Link radar level meter

Abstract

The present invention relates to the field of radar measurement technology, and in particular to an IO-Link radar level meter, comprising: a radar housing, an antenna, a threaded tube fixed below the radar housing, and a transmitter arranged inside the threaded tube, wherein the threaded tube has a convex mounting port inside, a purge assembly is arranged inside the mounting port, and the purge assembly is used to clean the transmitter; the purge assembly comprises a rotating ring and a nozzle, the rotating ring is rotatably arranged inside the mounting port, a plurality of nozzles are annularly arranged inside the rotating ring, and the jet end is arranged tilted downward to purge impurities on the transmitter; a mounting assembly is arranged inside the mounting port, the mounting assembly is arranged below the nozzle, the mounting assembly comprises a telescopic pipe fitting and a bottom ring, two telescopic pipes are symmetrically fixedly connected on both sides of the bottom ring, and the upper end of the telescopic pipe is fixedly connected below the protruding edge of the mounting port. The present invention effectively purges the side of the transmitter.

Description

Technical Field

[0001] The present invention relates to the field of radar measurement technology, and in particular to an IO-Link radar level meter. Background Art

[0002] Radar level meter is a high-precision non-contact level sensor. It calculates the level by measuring the time from the emission to the reception of radar waves. It has the advantages of high precision and high reliability. Radar level meter consists of multiple components such as radar detector body, antenna device, purge device and radar display.

[0003] The purge device in the radar level meter can purge the dust or impurities attached to the radar transmitting surface during the operation of the radar level meter. This can effectively avoid the interference of these attachments on the transmission and reception of radar waves, ensuring that the radar level meter can accurately and stably measure the level.

[0004] Most existing purging devices purge the inside of the antenna and cannot effectively purge the transmitter. During the purging process, impurities are easily adhered to the transmitter, affecting the normal transmission of the transmitter and interfering with the final detection effect. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that the inside of the antenna is mostly purged, and the transmitter is not purged. During the purging process, impurities are easily adhered to the transmitter, affecting the normal emission of the transmitter and interfering with the final detection effect. An IO-Link radar level meter is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An IO-Link radar level meter comprises: a radar housing, a threaded tube fixed below the radar housing, an antenna fixed at the lower end of the threaded tube, and a transmitter arranged inside the threaded tube, wherein a convex mounting opening is provided inside the threaded tube, a purge assembly is provided inside the mounting opening, and the purge assembly is used to clean the transmitter;

[0008] The purge assembly includes a rotating ring and a nozzle, wherein the rotating ring is rotatably arranged inside the mounting port, and a plurality of nozzles are annularly arranged inside the rotating ring, and the jet ends are arranged obliquely downward, for purging impurities on the emitter;

[0009] An installation component is arranged inside the installation port, and the installation component is arranged below the nozzle. The installation component includes a telescopic pipe and a bottom ring. Two telescopic pipes are symmetrically fixedly connected to both sides of the bottom ring and communicate with the annular cavity inside the bottom ring. The upper end of the telescopic pipe is fixedly connected below the protruding edge of the installation port.

[0010] A driving assembly is arranged between the rotating ring and the telescopic tube, and the driving assembly is used to drive the rotating ring to rotate.

[0011] Preferably, the purge assembly also includes a compression module, a conduit, a top plate and an outer ring, the compression module is arranged on the side of the threaded tube, an air port is opened between the compression module and the mounting port, the top plate is rotatably arranged on the upper surface of the rotating ring, one end of the conduit is fixedly connected to the end of the air port, and the other end is fixedly connected to the upper end of the top plate, the outer ring is fixedly connected to the inner wall of the mounting port, the rotating ring is rotatably arranged inside the outer ring, and an air cavity connected to multiple nozzles is arranged inside the rotating ring.

[0012] Preferably, the telescopic pipe fitting consists of a vertical pipe part and a telescopic part, the vertical pipe part is fixedly connected to the protruding bottom surface of the installation port, and the vertical pipe part close to the air port is connected to the air port through a vertical hole, and the telescopic part is fixedly connected between the vertical pipe part and the bottom ring.

[0013] Preferably, the driving assembly includes a driving nozzle and a driving plate, the driving nozzle is fixedly connected to the side of the vertical tube portion of the telescopic pipe away from the air port, and multiple driving plates are fixedly connected to the bottom of the rotating ring. The driving nozzle and the driving plate are both inclined, and the driving nozzle sprays gas to drive the driving plate to rotate.

[0014] Preferably, the bottom ring is provided with a collecting assembly, and the collecting assembly is used to collect the impurities blown down.

[0015] Preferably, the collecting assembly includes a collecting ring and a side scraper strip, the upper end of the collecting ring is threadedly connected to the bottom surface of the bottom ring, a collecting ring groove is provided on the inner side of the collecting ring, a chip guide opening is provided on the side of the collecting ring, the side scraper strip is fixedly connected to the side of the collecting ring, and the end is inclined upward and contacts with the side of the mounting opening.

[0016] Preferably, a material guide assembly is provided on the inner side of the bottom ring, and a plurality of the material guide assemblies are arranged in a ring shape on the inner side of the bottom ring for receiving impurities blown by the purge assembly.

[0017] Preferably, the material guide assembly includes a shaft piece and a guide piece, the two shaft pieces are symmetrically arranged on both sides of the guide piece, fixedly connected to the inner side of the bottom ring, and the guide piece is tilted upward, the guide piece is an arc-shaped piece, and an arc-shaped opening for chip guiding is opened in the middle of one side close to the bottom ring.

[0018] Preferably, the lower part of the shaft piece is made of elastic material, and a deformation cavity connected with the annular cavity is provided inside, and the deformation cavity is inflated and deformed to drive the guide piece to rotate downward.

[0019] Preferably, a filter module is provided at the bend of the conduit, and the filter module is provided in the middle of the conduit for filtering the introduced gas.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Since fixed-point purging will cause impurities in some parts of the transmitter to be unable to be cleaned, affecting the radar transmission effect, multiple nozzles rotate to spray gas, ensuring that the gas can effectively purge the side of the transmitter to avoid impurities remaining. At the same time, the rotating sprayed gas reduces the direct impact on the radar transmitter, avoiding damage to the radar transmitter caused by long-term impact;

[0022] When the nozzle is purging the transmitter, impurities will fall into the installation port. In order to prevent the impurities from falling into the transmitting antenna at the lower end, the impurities purged out need to be collected and processed. The collection ring is arranged below the bottom ring. When the bottom ring moves downward, it will drive the collection ring to move downward to prevent the gas sprayed by the nozzle from impacting the inside of the collection ring groove and causing the collected impurities to fall. At the same time, the collection ring at the bottom can effectively collect the impurities.

[0023] During the purging process, the inclined nozzle will blow the impurities toward the side of the installation port and collect the impurities inside the collection ring groove. However, some impurities will adhere to the side of the installation port. In order to avoid the accumulation of impurities during the next purging process, the collection ring moving up and down will drive the side scraper to move up and down. Through the up and down movement of the side scraper, the side scraper scrapes the impurities on the side wall of the installation port and guides them into the collection ring groove through the chip guide port, thereby collecting the impurities adhering to the side wall.

[0024] Since some impurities will fall from the middle of the bottom ring, in order to ensure the collection of impurities, the material guide component is used to block and guide the empty space in the middle of the bottom ring, so as to guide the impurities falling to the middle into the collection ring groove;

[0025] When not in use, there is no gas in the deformation cavity inside the shaft piece. The elastic effect of the shaft piece itself drives the guide piece to tilt upward and not contact the radar transmitter. When purging, part of the gas will enter the deformation cavity through the annular cavity inside the bottom ring, so that the deformation cavity expands and deforms upward, causing the guide piece to deflect downward and move closer to the transmitter, reducing the space in the middle and preventing impurities from falling into the antenna.

[0026] When the communication module transmits signals, it communicates through the IO-Link protocol. IO-Link is a point-to-point communication interface. IO-Link is a point-to-point serial digital communication protocol. Its purpose is to perform periodic data exchange between sensors. The sensors use a simple and unified wiring method and use very few interfaces. IO-Link devices and sensors without IO-Link on the IO-Link master can be combined arbitrarily, which is convenient to replace and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the front structure of an IO-Link radar level meter proposed by the present invention;

[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of an IO-Link radar level meter proposed by the present invention;

[0029] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0030] Figure 4 This is a schematic diagram of the internal structure of an IO-Link radar level meter proposed by the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the transmitter part of an IO-Link radar level meter proposed by the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of a purge component of an IO-Link radar level meter proposed by the present invention;

[0033] Figure 7 This is a schematic diagram of the expanded structure of a purge assembly of an IO-Link radar level meter proposed by the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of an installation component of an IO-Link radar level meter proposed by the present invention;

[0035] Fig. 9 A cross-sectional view of an installation assembly of an IO-Link radar level meter proposed by the present invention;

[0036] Fig.10 This is a schematic diagram of the bottom structure of an installation component of an IO-Link radar level meter proposed by the present invention;

[0037] Fig.11 This is a schematic diagram of the structure of a collection component of an IO-Link radar level meter proposed in the present invention.

[0038] In the figure: 1 radar housing, 2 threaded pipe, 3 transmitter, 4 purge assembly, 41 rotating ring, 42 nozzle, 43 compression module, 44 conduit, 45 top plate, 46 outer ring, 5 mounting assembly, 51 telescopic pipe fitting, 52 bottom ring, 6 driving assembly, 61 driving nozzle, 62 driving plate, 7 collecting assembly, 71 collecting ring, 72 side scraper, 8 material guide assembly, 81 shaft piece, 82 material guide piece, 9 filtering module, 10 communication module, 11 antenna. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] The terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present invention are only for the convenience of description and are not used to limit the scope of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of the present invention without substantially changing the technical content.

[0041] Reference Figure 1-Figure 11 , an IO-Link radar level meter, comprising: a radar housing 1, a threaded tube 2 fixed below the radar housing 1, an antenna 11 fixed at the lower end of the threaded tube and a transmitter 3 arranged inside the threaded tube 2, wherein the threaded tube 2 has a convex mounting port inside, a purge component 4 is arranged inside the mounting port, and the purge component 4 is used to clean the transmitter 3;

[0042] The purge assembly 4 includes a rotating ring 41 and a nozzle 42. The rotating ring 41 is rotatably arranged inside the installation port. A plurality of nozzles 42 are annularly arranged inside the rotating ring 41, and the jet end is tilted downward to purge impurities on the emitter 3. A controller is arranged inside the nozzle 42, and the jet is controlled by an external switch.

[0043] An installation assembly 5 is provided inside the installation port, and the installation assembly 5 is provided below the nozzle 42. The installation assembly 5 includes a telescopic pipe 51 and a bottom ring 52. The two telescopic pipes 51 are symmetrically fixedly connected to both sides of the upper end surface of the bottom ring 52 and communicate with the annular cavity inside the bottom ring 52. The upper end of the telescopic pipe 51 is fixedly connected below the protruding edge of the installation port.

[0044] A driving assembly 6 is disposed between the rotating ring 41 and the telescopic tube 51 , and the driving assembly 6 is used to drive the rotating ring 41 to rotate.

[0045] In the embodiment of the above technical solution, since the purging at fixed points will cause impurities in some positions of the transmitter 3 to be unable to be cleaned, affecting the radar transmission effect, the driving assembly 6 drives the rotating ring 41 to rotate, thereby driving the multiple nozzles 42 to rotate and spray, ensuring that the gas effectively purges the side of the transmitter 3 to avoid the residue of impurities. At the same time, the rotating sprayed gas reduces the direct impact on the radar transmitter 3, avoiding damage to the radar transmitter 3 caused by long-term impact;

[0046] During the jetting, in order to prevent the blown impurities from entering the antenna 11 and causing unevenness on the conductive surface inside the antenna 11, it is necessary to collect the impurities purged from the transmitter 3 while ensuring the normal use of the transmitter 3. While the purge assembly 4 is exhausting gas, part of the gas enters the telescopic tube 51. The gas passes through the telescopic tube 51 on one side and enters the annular cavity of the bottom ring 52. The telescopic tube 51 on the other side is then inflated, thereby driving the telescopic tube 51 to expand and contract, driving the bottom ring 52 to move downward, and while shrinking the impurity outlet below, driving the collecting assembly 7 to move downward to collect the blown impurities.

[0047] The preferred technical solution in this embodiment is:

[0048] Reference Figure 4-Figure 7 The purge assembly 4 further includes a compression module 43, a conduit 44, a top plate 45 and an outer ring 46. The compression module 43 is arranged on the side of the threaded tube 2. An air port is provided between the compression module 43 and the mounting port. The top plate 45 is rotatably arranged on the upper surface of the rotating ring 41. One end of the conduit 44 is fixedly connected to the end of the air port, and the other end is fixedly connected to the upper end of the top plate 45. The outer ring 46 is fixedly connected to the inner wall of the mounting port. The rotating ring 41 is rotatably arranged inside the outer ring 46, and an air cavity communicating with a plurality of nozzles 42 is provided inside the rotating ring 41.

[0049] The external air is compressed by the compression module 43, introduced into the rotating ring 41 through the conduit 44, and then sprayed out through the nozzle 42. The inclined nozzle 42 will increase the contact area with the emitter 3, so as to purge the side of the emitter 3. In order to ensure the normal rotation of the rotating ring 41, the ball is rotatably connected with the top plate 45 and the outer ring 46 on the side to reduce the friction generated by the rotating ring 41 during rotation, so as to ensure the normal rotation of the rotating ring 41;

[0050] During the purging process, the nozzle 42 is first closed to introduce the gas introduced by the compression module 43 into the telescopic tube 51 to first meet the use conditions of the telescopic tube 51 and the drive assembly 6, and then the nozzle 42 is opened for purging.

[0051] Reference Figure 8 The telescopic pipe 51 is composed of a vertical pipe part and a telescopic part. The vertical pipe part is fixedly connected to the protruding bottom surface of the installation port, and the vertical pipe part close to the gas port is connected to the gas port through a vertical hole. The telescopic part is fixedly connected between the vertical pipe part and the bottom ring 52;

[0052] The vertical tube part is used for connection, and the telescopic part is made of elastic material and is folded. When inflated, the telescopic part is inflated and deformed from a folded shape to a columnar shape, thereby driving the bottom ring 52 to move downward;

[0053] Reference Figure 7 and Figure 8 The driving assembly 6 includes a driving nozzle 61 and a driving plate 62. The driving nozzle 61 is fixedly connected to the side of the vertical tube portion of the telescopic pipe 51 away from the gas port. A plurality of driving plates 62 are fixedly connected to the bottom of the rotating ring 41. The driving nozzle 61 and the driving plate 62 are both inclined. The driving nozzle 61 ejects gas to drive the driving plate 62 to rotate.

[0054] A gas pressure valve is provided inside the driving nozzle 61. When the gas pressure is insufficient, the gas is introduced to inflate the telescopic tube 51. When the gas is continuously introduced, the internal gas pressure increases, thereby exceeding the threshold of the gas pressure valve. The gas is ejected from the driving nozzle 61, and the ejected gas hits the driving plate 62, driving the driving plate 62 to move. The multiple driving plates 62 that are continuously impacted will drive the rotating ring 41 to rotate, so that the gas ejected from the nozzle 42 rotates, thereby ensuring the purging effect of impurities.

[0055] Reference Fig.11 The bottom ring 52 is provided with a collecting assembly 7, and the collecting assembly 7 is used to collect the impurities blown down;

[0056] The collecting assembly 7 comprises a collecting ring 71 and a side scraper 72. The upper end of the collecting ring 71 is threadedly connected to the bottom surface of the bottom ring 52. A collecting ring groove is provided inside the collecting ring 71. A chip guide opening is provided on the side of the collecting ring 71. The side scraper 72 is fixedly connected to the side of the collecting ring 71, and the end thereof is tilted upward and contacts the side of the mounting opening.

[0057] When the nozzle 42 is purging the transmitter 3, impurities will fall into the installation port. In order to prevent the impurities from falling into the transmitting antenna 11 at the lower end, the purged impurities need to be collected and processed. The collecting ring 71 is arranged below the bottom ring 52. When the bottom ring 52 moves downward, it will drive the collecting ring 71 to move downward to prevent the gas sprayed by the nozzle 42 from impacting the inside of the collecting ring groove and causing the collected impurities to fall. At the same time, the collecting ring 71 located at the bottom can effectively collect the impurities.

[0058] During the purging process, the nozzle 42 disposed obliquely will blow the impurities toward the side of the installation port, and collect the impurities inside the collecting ring groove. However, some impurities will adhere to the side of the installation port. In order to avoid the accumulation of impurities during the next purging process, the collecting ring 71 moving up and down will drive the side scraper 72 to move up and down. Through the up and down movement of the side scraper 72, the side scraper 72 scrapes the impurities on the side wall of the installation port and guides them into the collecting ring groove along the chip guide port, thereby collecting the impurities adhering to the side wall.

[0059] Reference Figure 8-Figure 10A material guide assembly 8 is disposed inside the bottom ring 52, and a plurality of the material guide assemblies 8 are disposed in an annular shape inside the bottom ring 52 for receiving impurities blown by the purge assembly 4;

[0060] The material guide assembly 8 includes a shaft piece 81 and a material guide piece 82. The two shaft pieces 81 are symmetrically arranged on both sides of the material guide piece 82, and are fixedly connected to the inner side of the bottom ring 52, and the material guide piece 82 is arranged tilted upward. The material guide piece 82 is an arc-shaped piece, and an arc-shaped opening for chip guiding is opened in the middle of one side close to the bottom ring 52;

[0061] The lower part of the shaft sheet 81 is made of elastic material, and a deformation cavity connected to the annular cavity is provided inside. The deformation cavity is inflated and deformed to drive the guide sheet 82 to rotate downward.

[0062] Since some impurities will fall from the middle of the bottom ring 52, in order to ensure the collection of the impurities, the material guide component 8 blocks and guides the empty space in the middle of the bottom ring 52, so that the impurities falling to the middle are guided into the collection ring groove;

[0063] When not in use, there is no gas in the deformation cavity inside the shaft piece 81. The elastic action of the shaft piece 81 itself drives the guide piece 82 to tilt upward and not contact the radar transmitter 3. When purging, part of the gas will enter the deformation cavity through the annular cavity inside the bottom ring 52, so that the deformation cavity expands and deforms upward, causing the guide piece 82 to deflect downward and move closer to the transmitter 3, thereby reducing the space in the middle and preventing impurities from falling into the antenna 11.

[0064] When the impurities are blown onto the guide sheet 82, they will fall into the collecting annular groove along the inclined surface of the guide sheet 82 itself. The impurities adhering to the guide sheet 82 will also fall downward and enter the collecting annular groove when the guide sheet tilts upward.

[0065] Reference Figure 4 The radar housing 1 is provided with a radar display instrument inside, and the radar display instrument is provided with a communication module 10 inside;

[0066] When the communication module 10 transmits signals, it communicates through the IO-Link protocol. IO-Link is a point-to-point communication interface. IO-Link is a point-to-point serial digital communication protocol. Its purpose is to perform periodic data exchange between sensors. The sensors use a simple and unified wiring method, and the interfaces used are very few. IO-Link devices and sensors without IO-Link on the IO-Link master can be combined arbitrarily, which is convenient for replacement and easy for maintenance.

[0067] Reference Figure 5 and Figure 6A filter module 9 is provided at the bend of the conduit 44. The filter module 9 is provided in the middle of the conduit 44 and is used to filter the introduced gas. In order to prevent impurities in the air from adhering to the emitter 3 during the purging process, the air is filtered by the filter module 9 to ensure the purging effect on the emitter 3.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An IO-Link radar level meter, comprising: A radar housing, a threaded tube fixed below the radar housing, an antenna fixed at the lower end of the threaded tube, and a transmitter arranged inside the threaded tube, wherein the threaded tube has a convex mounting opening inside, a purge assembly is arranged inside the mounting opening, and the purge assembly is used to clean the transmitter; The purge assembly includes a rotating ring and a nozzle, wherein the rotating ring is rotatably arranged inside the mounting port, and a plurality of nozzles are annularly arranged inside the rotating ring, and the jet ends are arranged obliquely downward, for purging impurities on the emitter; An installation component is arranged inside the installation port, and the installation component is arranged below the nozzle. The installation component includes a telescopic pipe and a bottom ring. Two telescopic pipes are symmetrically fixedly connected to both sides of the upper end surface of the bottom ring and communicate with the annular cavity inside the bottom ring. The upper end of the telescopic pipe is fixedly connected below the protruding edge of the installation port. The bottom ring is provided with a collecting assembly, and the collecting assembly is used to collect impurities blown down. The collecting assembly includes a collecting ring and a side scraper. The upper end of the collecting ring is threadedly connected to the bottom surface of the bottom ring, the inner side of the collecting ring is provided with a collecting ring groove, and the side edge of the collecting ring is provided with a chip guide port. The side scraper is fixedly connected to the side edge of the collecting ring, and the end portion is tilted upward and contacts the side edge of the mounting port. A driving assembly is arranged between the rotating ring and the telescopic pipe fitting, and the driving assembly is used to drive the rotating ring to rotate. The driving assembly includes a driving nozzle and a driving plate. The driving nozzle is fixedly connected to the side of the vertical tube portion of the telescopic pipe fitting away from the air port, and a plurality of driving plates are fixedly connected to the bottom of the rotating ring. The driving nozzle and the driving plate are both arranged obliquely, and the driving nozzle sprays gas to drive the driving plate to rotate.

2. The IO-Link radar level meter according to claim 1, characterized in that: The purge assembly also includes a compression module, a conduit, a top plate and an outer ring. The compression module is arranged on the side of the threaded tube. An air port is opened between the compression module and the mounting port. The top plate is rotatably arranged on the upper surface of the rotating ring. One end of the conduit is fixedly connected to the end of the air port, and the other end is fixedly connected to the upper end of the top plate. The outer ring is fixedly connected to the inner wall of the mounting port. The rotating ring is rotatably arranged inside the outer ring, and an air cavity connected to multiple nozzles is arranged inside the rotating ring.

3. The IO-Link radar level meter according to claim 1, characterized in that: The telescopic pipe fitting consists of a vertical pipe part and a telescopic part. The vertical pipe part is fixedly connected to the protruding bottom surface of the installation port, and the vertical pipe part close to the air port is connected to the air port through a vertical hole. The telescopic part is fixedly connected between the vertical pipe part and the bottom ring.

4. The IO-Link radar level meter according to claim 1, characterized in that: A material guide assembly is arranged on the inner side of the bottom ring, and a plurality of the material guide assemblies are arranged in a ring shape on the inner side of the bottom ring for receiving impurities blown by the purge assembly. The material guide assembly includes a shaft piece and a material guide piece. The two shaft pieces are symmetrically arranged on both sides of the material guide piece and are fixedly connected to the inner side of the bottom ring, and the material guide piece is arranged tilted upward. The material guide piece is an arc-shaped piece, and an arc-shaped opening for chip guiding is opened in the middle of one side close to the bottom ring.

5. The IO-Link radar level meter according to claim 1, characterized in that: A radar display instrument is arranged inside the radar housing, and a communication module is arranged inside the radar display instrument.

6. The IO-Link radar level meter according to claim 4, characterized in that: The lower part of the shaft sheet is made of elastic material, and a deformation cavity connected with the annular cavity is provided inside. The deformation cavity is inflated and deformed to drive the guide sheet to rotate downward.

7. The IO-Link radar level meter according to claim 2, characterized in that: A filter module is arranged at the bend of the conduit, and the filter module is arranged in the middle of the conduit for filtering the introduced gas.

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