Respiratory dust separator protection shell, separator assembly and concentration measurement equipment

Abstract

The utility model relates to the technical field of fluid concentration detection, in particular to a protective shell of a respirable dust separator, a separator assembly and concentration measuring equipment, the protective shell of the respirable dust separator is provided with a shell inner cavity which is arranged at the air inlet part of the respirable dust separator in a sealing and covering manner, and the protective shell is provided with an airflow channel; the protective shell comprises at least two layers of flow guide walls arranged inside and outside, the airflow channel comprises flow guide holes formed in the flow guide walls respectively, the flow guide holes in every two adjacent layers of flow guide walls are arranged in a staggered mode, the airflow direction can be changed, and the inner layer of flow guide wall buffers airflow; by means of the flow guide holes, large-particle dust in dusty gas can fall into the dust collection space on the lower side of the flow guide holes and is prevented from entering the separator, part of small-particle dust and respirable dust can be continuously carried by airflow to flow into the separator, and it is guaranteed that the dusty gas normally enters the separator, and meanwhile the large-particle dust is not prone to entering the separator; and the interior of the separator is not easy to block.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid concentration detection, in particular to a protective shell of a respirable dust separator, a separator assembly and a concentration measuring device. Background Art

[0002] During the coal mine production process, the dust generated is highly harmful. Especially the respirable dust in the dust-containing gas will seriously affect the physical health of workers. In order to monitor and control the dust concentration in real time, at present, a respirable dust concentration measuring device is used to measure the respirable dust concentration in real time. Its detection principle is to first use a separator to separate the respirable dust from the total dust, and the separated respirable dust is transmitted to the dust concentration detection unit for concentration measurement. The dust concentration detection principle can be based on principles such as light scattering method, β-ray method, charge induction method, oscillating microbalance method, etc.

[0003] The separator structure of the existing respirable dust concentration measuring device can be seen in a gas guiding and dust accumulating assembly for respirable dust concentration detection disclosed in the Chinese utility model patent with the authorization announcement number of CN220556413U. It includes a gas guiding cavity and a separation cavity. An air inlet is provided on the side wall of the separation cavity, and an air outlet is provided on the side wall of the gas guiding cavity. When admitting air, the dust-containing air spirally flows downward along the inner wall of the separation cavity from the air inlet. Large particle dust deposits in the dust accumulating cavity, and the gas containing respirable dust enters the gas guiding cavity upward along the gas guiding channel and is discharged from the air outlet.

[0004] When the respirable dust concentration measuring device is used underground in a coal mine, it is usually hung on the side wall of the roadway. The air inlet of the separator is exposed to the outside for the outside dust-containing air to enter. Sometimes the underground environment is relatively harsh, and there are more large particle dusts mixed in the underground air. The dust enters the separator along with the air flow and is prone to blockage, increasing the maintenance frequency of the equipment. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a protective shell for a respirable dust separator to solve the problem that the separator of the current respirable dust concentration measuring device is prone to blockage due to the entry of large particle dusts; the purpose of the utility model is also to provide a respirable dust separator assembly and a respirable dust concentration measuring device to solve the above problems.

[0006] The technical solution of the protective shell of the respirable dust separator of the utility model is as follows:

[0007] Respirable dust separator protective shell. The protective shell is provided with a shell inner cavity for sealing and covering the air inlet part of the respirable dust separator. The protective shell is provided with an air flow channel communicating with the shell inner cavity for dust-containing gas to enter the respirable dust separator. The protective shell includes at least two layers of diversion walls arranged inside and outside, wherein the innermost diversion wall forms a part of the cavity wall of the shell inner cavity. The air flow channel includes diversion holes respectively arranged on each diversion wall. The diversion holes on adjacent two layers of diversion walls are arranged in a staggered manner, and a dust collection space is provided below the diversion holes between adjacent two layers of diversion walls.

[0008] Furthermore, the diversion wall is of an annular structure, and the diversion holes on adjacent two diversion walls are staggered in the radial direction of the diversion wall.

[0009] Furthermore, the diversion hole is a long hole extending along the axial direction of the diversion wall.

[0010] Furthermore, the air flow channel has a channel inlet, and the channel inlet is arranged downward.

[0011] Furthermore, the air flow channel includes at least two diversion sections located upstream of the diversion holes in the flowing direction of the dust-containing gas, and the extending directions of adjacent two diversion sections are arranged at an angle.

[0012] Furthermore, the protective shell includes an inner shell body and an outer sleeve body sleeved outside the inner shell body. The diversion wall is arranged on the inner shell body, and the inner shell body and the outer sleeve body are provided with parts for enclosing the diversion section and the channel inlet.

[0013] Beneficial effects of the respirable dust separator protective shell of the present utility model: The present utility model pioneeringly provides a protective shell that can prevent large particle dust from entering the inside of the respirable dust separator. The air inlet part of the respirable dust separator is sealed and covered by the shell inner cavity of the protective shell, so that the dust-containing gas enters the separator through the air flow channel on the protective shell. The air flow channel of the protective shell has diversion holes that are internally and externally staggered and arranged on each layer of diversion wall. When the dust-containing gas flows from outside to inside, due to the staggered arrangement of the diversion holes on different layers of diversion walls, the air flow direction can be changed. The innermost diversion wall buffers and blocks the air flow, slows down the air flow, so that the large particle dust in the dust-containing gas can fall into the dust collection space below the diversion holes and avoid entering the separator, while the small particles and respirable dust can continue to be carried by the air flow and flow to the separator. In this way, while ensuring the normal entry of the dust-containing gas into the separator, it is not easy for large particle dust to enter the inside of the separator, and it is not easy for the inside of the separator to be blocked, which is beneficial to reducing the maintenance frequency.

[0014] The technical solution of the respirable dust separator assembly of the present utility model is:

[0015] Respirable dust separator assembly, comprising a respirable dust separator and a protective housing. The protective housing is provided with a housing inner cavity for sealing and covering the air inlet part of the respirable dust separator. The protective housing is provided with an air flow channel communicating with the housing inner cavity for allowing the dust-containing gas to enter the respirable dust separator. The protective housing comprises at least two layers of diversion walls arranged inside and outside, wherein the innermost diversion wall forms a part of the cavity wall of the housing inner cavity. The air flow channel comprises diversion holes respectively arranged on each diversion wall. The diversion holes on adjacent two layers of diversion walls are arranged in a staggered manner, and a dust collection space is provided below the diversion holes between adjacent two layers of diversion walls.

[0016] Furthermore, the diversion wall is of an annular structure, and the diversion holes on adjacent two diversion walls are staggered in the radial direction of the diversion wall.

[0017] Furthermore, the diversion hole is a long hole extending along the axial direction of the diversion wall.

[0018] Furthermore, the air flow channel has a channel inlet, and the channel inlet is arranged downward.

[0019] Furthermore, the air flow channel comprises at least two diversion sections located upstream of the diversion hole in the flowing direction of the dust-containing gas, and the extending directions of adjacent two diversion sections are arranged at an angle.

[0020] Furthermore, the protective housing comprises an inner housing and an outer housing sleeved outside the inner housing. The diversion wall is arranged on the inner housing, and the inner housing and the outer housing are provided with parts for enclosing the diversion section and the channel inlet.

[0021] Advantages of the respirable dust separator assembly of the present utility model: The present utility model pioneeringly provides a protective housing capable of preventing large-particle dust from entering the inside of the respirable dust separator. The air inlet part of the respirable dust separator is sealed and covered by the housing inner cavity of the protective housing, so that the dust-containing gas enters the separator through the air flow channel on the protective housing. The air flow channel of the protective housing has diversion holes arranged inside and outside and staggered on each layer of diversion wall. When the dust-containing gas flows from outside to inside, due to the staggered arrangement of the diversion holes on different layers of diversion walls, the air flow direction can be changed. The inner diversion wall buffers and blocks the air flow, slows down the air flow, so that the large-particle dust in the dust-containing gas can fall into the dust collection space below the diversion holes and avoid entering the separator, while the small particles and respirable dust can continue to be carried by the air flow and flow to the separator. In this way, while ensuring the normal entry of the dust-containing gas into the separator, it is not easy for large-particle dust to enter the inside of the separator, and it is not easy for the inside of the separator to be blocked, which is beneficial to reducing the maintenance frequency.

[0022] The technical solution of the respirable dust concentration measuring device of the present utility model is:

[0023] Respirable dust concentration measuring device, including a protective shell of a respirable dust separator, the protective shell is provided with a shell inner cavity for sealing and covering the air inlet part of the respirable dust separator, and the protective shell is provided with an air flow channel communicating with the shell inner cavity for allowing dust-containing gas to enter the respirable dust separator. The protective shell includes at least two layers of guide walls arranged inside and outside, and the innermost guide wall forms a part of the cavity wall of the shell inner cavity. The air flow channel includes guide holes respectively arranged on each guide wall, the guide holes on adjacent two guide walls are arranged in a staggered manner, and a dust collection space is provided below the guide holes between adjacent two guide walls.

[0024] Further, the guide wall is of an annular structure, and the guide holes on adjacent two guide walls are staggered in the radial direction of the guide wall.

[0025] Further, the guide hole is a long hole extending along the axial direction of the guide wall.

[0026] Further, the air flow channel has a channel inlet, and the channel inlet is arranged downward.

[0027] Further, the air flow channel includes at least two turning sections located upstream of the guide hole in the flowing direction of the dust-containing gas, and the extending directions of adjacent two turning sections are arranged at an angle.

[0028] Further, the protective shell includes an inner shell body and an outer shell body sleeved outside the inner shell body, the guide wall is arranged on the inner shell body, and the inner shell body and the outer shell body are provided with parts for enclosing the turning section and the channel inlet.

[0029] Further, an outer cover is also provided outside the protective shell, and the outer cover is provided with a hole structure.

[0030] Further, a fixing structure for fixing the outer cover is provided at the upper end of the outer shell body of the respirable dust concentration measuring device, and a water passing gap is provided between the lower end of the outer cover and the upper surface of the outer shell body.

[0031] Advantages of the respirable dust concentration measuring device of the present utility model: The present utility model pioneeringly provides a protective shell that can prevent large particulate dust from entering the interior of the respirable dust separator. The inner cavity of the protective shell seals and covers the air inlet part of the respirable dust separator, enabling the dust-containing gas to enter the separator through the air flow channel on the protective shell. The air flow channel of the protective shell has internally and externally misaligned diversion holes provided on each layer of diversion walls. When the dust-containing gas flows from the outside to the inside, due to the misaligned diversion holes on the diversion walls of different layers, the air flow direction can be changed. The inner layer of the diversion wall buffers and blocks the air flow, slowing down the air flow, so that the large particulate dust in the dust-containing gas can fall into the dust collection space below the diversion holes and avoid entering the separator, while the small particles and respirable dust can continue to be carried by the air flow and flow to the separator. In this way, while ensuring the normal entry of the dust-containing gas into the separator, it is not easy for large particulate dust to enter the interior of the separator, and it is not easy for the interior of the separator to be blocked, which is conducive to reducing the maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of an embodiment of the respirable dust concentration measuring device of the present utility model;

[0033] Figure 2 is Figure 1 a schematic diagram of the respirable dust concentration measuring device in without the outer cover and the fan cover;

[0034] Figure 3 is Figure 2 a schematic connection diagram of the separator assembly and the corner joint in ;

[0035] Figure 4 is Figure 2 a perspective view of the separator assembly in ;

[0036] Figure 5 is Figure 2 a cross-sectional view of the separator assembly and the adapter joint in ;

[0037] Figure 6 is Figure 5 a schematic structural diagram of the inner housing in ;

[0038] Figure 7 is Figure 5 a schematic structural diagram of the separator in .

[0039] In the figure: 1. Outer housing; 2. Separator assembly; 20. Separator; 201. Air inlet; 21. Adapter; 22. Compression nut; 23. Outer sleeve; 24. Connecting ring; 25. Inner housing; 251. Outer layer diversion wall; 252. Inner layer diversion wall; 253. Diversion hole; 254. Upper ring platform; 255. Lower ring platform; 256. Upper diversion section; 257. Lower diversion section; 258. Channel inlet; 259. Dust collection space; 26. Wall-passing joint; 3. Corner joint; 4. Adapter main body section; 5. Upstream section of dust measurement path; 6. Dust concentration detection unit; 7. Three-way joint; 8. Electric valve of dust measurement path; 9. Downstream section of dust measurement path; 10. Dust measurement fan; 11. Dust storage box; 12. Electric valve of dust discharge path; 13. Main body section of dust discharge path; 14. Dust discharge fan; 15. Main body section of calibration path; 16. Calibration interface; 18. Outer cover; 19. Fan cover. Detailed implementation manner

[0040] In the present utility model, the air inlet part of the respirable dust separator is hermetically covered by the inner cavity of the protective shell, so that the dust-containing gas enters the separator through the air flow channel on the protective shell. The air flow channel of the protective shell has internally and externally misaligned diversion holes provided on each layer of diversion walls. When the dust-containing gas flows from the outside to the inside, due to the misaligned arrangement of the diversion holes on different layers of diversion walls, the air flow direction can be changed. The inner layer diversion wall buffers and blocks the air flow, delaying the air flow, so that the large-particle dust in the dust-containing gas can fall into the dust collection space below the diversion hole and is prevented from entering the separator, while the smaller particles and respirable dust can continue to be carried by the air flow and flow to the separator. In this way, while ensuring the normal entry of the dust-containing gas into the separator, it is not easy for large-particle dust to enter the interior of the separator, and it is not easy for the interior of the separator to be blocked, which is beneficial to reducing the maintenance frequency.

[0041] Embodiment of the respirable dust concentration measuring device of the present utility model:

[0042] Such as Figure 1 And Figure 2As shown in the figure, the respirable dust concentration measuring device includes a housing 1, and a separator assembly 2, a dust measuring passage, a dust discharging passage, a dust measuring fan 10, and a dust discharging fan 14 installed on the housing 1. The housing 1 is a closed housing, and a part of it is hidden in the figure for showing the internal structure. The dust measuring passage includes an elbow joint 3, a transition main section 4, an upstream section 5 of the dust measuring passage, a dust concentration detection unit 6, a tee joint 7, an electric valve 8 of the dust measuring passage, and a downstream section 9 of the dust measuring passage, which are arranged in sequence from upstream to downstream. One end of the dust measuring passage is connected to the separator assembly 2, and the other end is connected to the dust measuring fan 10. The dust discharging passage includes a dust storage box 11, an electric valve 12 of the dust discharging passage, and a main section 13 of the dust discharging passage, which are arranged in sequence from upstream to downstream. One end of the dust discharging passage is connected to the separator assembly 2, and the other end is connected to the dust discharging fan 14. When measuring the respirable dust concentration, the dust-containing gas enters the separator assembly 2 to separate the respirable dust from the coarse particulate dust. The air flow direction of the respirable dust is from the upstream to the downstream of the dust measuring passage, and the air flow direction of the coarse particulate dust is from the upstream to the downstream of the dust discharging passage. The separated respirable dust can be measured for concentration through the dust measuring passage under the action of the dust measuring fan 10, while the coarse particulate dust can be discharged through the dust discharging passage under the action of the dust discharging fan 14 when it needs to be discharged.

[0043] When the working environment of the device is poor, there will be more large particulate dust mixed in the dust-containing air flow. The particle size of the large particulate dust is much larger than that of the respirable dust and the coarse particulate dust. In order to block the large particulate dust, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown in the figure, the separator assembly includes a separator 20 and a protective housing arranged outside the separator 20. The protective housing includes a compression nut 22, an outer housing 23, a connecting ring 24, an inner housing 25, and a through-wall joint 26. The protective housing can play a role in blocking large particulate dust or water from entering the inside of the separator 20.

[0044] The separator 20 is a cyclone separator. The upper end of the separator 20 has a part extending into the adapter 21 and is connected to the corner joint 3 through the adapter 21. The compression nut 22 is sleeved outside the adapter 21. The connecting ring 24 is arranged below the downward step surface at the upper end of the separator 20. The upper end of the compression nut 22 is provided with an inner ring platform and the lower end is provided with an internal thread. The lower end of the adapter 21 is provided with an outer ring platform located below the inner ring platform at the upper end of the compression nut 22. The connecting ring 24 is provided with an external thread that mates with the internal thread at the lower end of the compression nut 22. The compression nut 22 is threadedly connected to the connecting ring 24. By screwing the compression nut 22, the compression nut 22 can be tightened against the adapter 21, and the adapter 21, the separator 20 and the connecting ring 24 can be fixed together. A sealing ring is provided between the connecting ring 24 and the downward step surface at the upper end of the separator 20, and a sealing ring is provided between the separator 20 and the adapter 21. The upper end of the inner housing 25 is fixed to the connecting ring 24, and the lower end presses on the upper ring platform of the through-wall joint 26. The upper ring platform of the through-wall joint 26 presses on the upper surface of the outer housing and is sealed through a sealing ring. The lower part of the through-wall joint 26 penetrates into the outer housing and is connected with a fixing nut to fix the through-wall joint 26 to the outer housing. The lower end of the separator 20 extends into the central hole of the through-wall joint 26, and a sealing ring is provided between the outer peripheral surface of the separator 20 and the hole wall of the central hole of the through-wall joint 26. The lower end of the through-wall joint 26 is connected to the dust storage box 11. The outer sleeve 23 is spaced and sleeved outside the inner housing 25, and the upper end of the outer sleeve 23 is fixed to the lower end of the compression nut 22. The inner housing 25 is spaced and sleeved outside the separator 20 and covers the air inlet 201 of the separator 20. The inner housing 25, the connecting ring 24 and the through-wall joint 26 cooperate to enclose the inner cavity of the protective shell. The inner cavity is used to seal and cover the air inlet 201 part of the separator 20. The inner housing 25 and the outer sleeve 23 cooperate to form an air flow channel on the protective shell that communicates with the inner cavity, so that the dust-containing gas can enter the separator 20 from the air flow channel through the inner cavity.

[0045] The inner housing 25 includes two layers of flow guiding walls arranged inside and outside. The two layers of flow guiding walls are the inner flow guiding wall 252 and the outer flow guiding wall 251 respectively. The inner flow guiding wall 252 forms a part of the cavity wall of the housing cavity. The air flow channel includes flow guiding holes 253 respectively arranged on each flow guiding wall. Both the inner flow guiding wall 252 and the outer flow guiding wall 251 are provided with flow guiding holes 253. The flow guiding holes 253 on the two layers of flow guiding walls are arranged in a staggered manner. A dust collection space 259 is provided below the flow guiding holes 253 between the two layers of flow guiding walls. When the dusty gas flows from outside to inside, due to the staggered arrangement of the flow guiding holes 253 on different layers of flow guiding walls, the air flow direction can be changed. The inner flow guiding wall 252 buffers and blocks the air flow, slows down the air flow so that the dust with very large particles can no longer be carried by the air flow. The large particle dust in the dusty gas can fall into the dust collection space 259 below the flow guiding holes 253 and is prevented from entering the separator. While the relatively small coarse particle dust and respirable dust can continue to be carried by the air flow and flow to the separator 20 for separation. In this way, while ensuring the normal entry of the dusty gas into the separator, it is not easy for the large particle dust to enter the interior of the separator 20, and it is not easy for the interior of the separator to be blocked, which is beneficial to reducing the maintenance frequency.

[0046] The inner housing 25 is an annular housing. Both the inner flow guiding wall 252 and the outer flow guiding wall 251 are annular structures. The two layers of flow guiding walls are coaxially arranged. The flow guiding holes 253 on the two layers of flow guiding walls are staggered in the radial direction of the flow guiding wall. By arranging the flow guiding holes 253 at different positions in the circumferential direction of the inner housing 25, it is beneficial to reduce the axial dimension of the inner housing 25. The axial direction of the inner housing 25 is the up and down direction. The flow guiding holes 253 are long holes extending along the axial direction of the flow guiding wall. The flow guiding holes 253 penetrate radially. A plurality of flow guiding holes 253 are arranged along the circumferential direction on the same flow guiding wall, which is beneficial to ensure the flow through area. The flow guiding holes 253 are arranged at the upper position of the flow guiding wall. A plurality of connecting ribs are provided between the upper ends of the two layers of flow guiding walls. The interval between the lower parts of the two layers of flow guiding walls can be used to form the dust collection space 259.

[0047] A channel inlet 258 of an air flow channel is formed between the lower ends of the outer casing 23 and the inner casing 25. The channel inlet 258 is arranged downward, which is beneficial to prevent water from entering the air flow channel. The air flow channel includes two turning sections located upstream of the diversion holes 253 in the flowing direction of the dust-containing gas. The two turning sections are respectively an upper turning section 256 and a lower turning section 257. The extending directions of the two turning sections are arranged at an angle. By using the two turning sections to change the air flow direction and increase the air flow path, it is beneficial to prevent water from flowing into the separator interior along the inner wall of the air flow channel. The inner casing 25 and the outer casing 23 are provided with parts for forming the turning sections and the channel inlet 258. The outer wall of the inner casing 25 is provided with an upper ring platform 254 and a lower ring platform 255. The inner wall of the outer casing 23 is provided with an inner ring platform. The inner ring platform of the outer casing 23 corresponds to the space between the upper ring platform 254 and the lower ring platform 255 of the inner casing 25. An upper turning section 256 is formed between the inner ring platform of the outer casing 23 and the upper ring platform 254 of the inner casing 25, and a lower turning section 257 is formed between the inner ring platform of the outer casing 23 and the lower ring platform 255 of the inner casing 25. The dust-containing gas enters from the channel inlet 258, passes through the lower turning section 257 and the upper turning section 256, and then enters the cavity between the upper part of the outer casing 23 and the outer layer diversion wall 251 of the inner casing 25. Then it enters the shell inner cavity through the diversion holes 253 on the diversion wall, and further enters the separator 20. Large particle dust is blocked outside by the protective shell. The respirable dust enters the corner joint 3 of the dust detection path after being separated from the upper side outlet of the separator. Coarse particle dust can enter the dust storage box 11 of the dust discharge path from the lower side outlet of the separator.

[0048] The corner joint 3 is connected to the transfer main body section 4 and together they form the transfer section of the dust detection path located outside the outer shell 1. The transfer main body section 4 is fixedly connected to the upstream section 5 of the dust detection path. By using the fixed transfer main body section 4, the position of the corner joint 3 can be maintained, thereby ensuring the reliable installation of the separator assembly 2. The upstream section 5 of the dust detection path is connected to the dust concentration detection unit 6. The dust concentration detection unit 6 can adopt a laser detection sensor, and its detection principle is prior art and will not be elaborated here. The dust concentration detection unit 6 is connected to the calibration path and the dust detection path electric valve 8 through a tee joint 7. The calibration path includes a calibration path main body section 15 and a calibration interface 16. The dust detection path electric valve 8 is connected to the downstream section 9 of the dust detection path. The downstream section 9 of the dust detection path is connected to the dust detection fan 10. The upstream section 5 of the dust detection path, the dust concentration detection unit 6, the tee joint 7, the dust detection path electric valve 8, and the downstream section 9 of the dust detection path together form the main body section of the dust detection path located inside the inner cavity of the outer shell 1, so that the dust detection path has a transfer section located outside the outer shell 1 to facilitate the connection of the separator assembly 2 and reduce the size of the outer shell 1. The transfer section and the main body section of the dust detection path are detachably connected, that is, the transfer main body section 4 and the upstream section 5 of the dust detection path are detachably connected. Here, a quick-release structure can be adopted to facilitate the removal of all components except the dust removal wall joint 26 of the separator assembly 2 installed using the external space of the outer shell 1 and the transfer section as a whole from the outer shell 1 for easy maintenance.

[0049] The top of the outer housing is provided with an outer cover 18. The outer cover 18 covers the entire separator assembly 2, the corner joint 3 and the adapter main section 4. The outer cover 18 is provided with a hole structure to facilitate the entry of dusty air into the outer cover 18. At the same time, the holes densely distributed on the outer cover 18 are relatively small, which can block large water flows or sundries. The upper end of the outer housing is provided with a fixing structure for fixedly connecting the outer cover 18. The fixing structure is a fixing ear protruding upward. The outer cover 18 is detachably connected to the fixing ear on the outer housing. The lower end of the outer cover 18 is spaced from the upper surface of the outer housing to form a water passing gap. A small amount of water entering the outer cover 18 through the holes can flow out from the bottom water passing gap.

[0050] The dust storage box 11 of the dust exhaust passage is connected to the dust exhaust passage electric valve 12. The dust exhaust passage electric valve 12 is connected to the dust exhaust passage main section 13. The dust exhaust passage main section 13 is connected to the dust exhaust fan 14. The dust storage box 11, the dust exhaust passage electric valve 12 and the dust exhaust passage main section 13 are arranged in the inner cavity of the outer housing 1. The inner cavity of the dust storage box 11 of the dust exhaust passage constitutes a dust storage cavity arranged downstream of the separation mechanism on the dust exhaust passage. The dust storage box 11 can store a certain amount of coarse particulate dust, reduce the opening frequency of the dust exhaust fan 14, and save energy consumption. The dust measurement passage electric valve 8 constitutes a switching valve on the dust measurement passage, and the dust exhaust passage electric valve 12 constitutes a switching valve on the dust exhaust passage. The switching valves are used to facilitate the control of the on / off of the passage. When measuring the concentration of respirable dust, the dust exhaust passage electric valve 12 can be closed. When it is necessary to discharge coarse particulate dust, the dust measurement passage electric valve 8 can be closed, which is beneficial to reducing the energy consumption when the fan is started. The outer sides of the dust exhaust fan 14 and the dust measurement fan 10 are covered with a fan cover 19 to prevent the fan from getting water. The lower side of the fan cover 19 is provided with a dust outlet to facilitate the discharge of dust.

[0051] One end of the calibration path main section 15 of the calibration path is connected to the tee joint 7 of the dust measurement path. The other end of the calibration path main section 15 is provided with a calibration interface 16. The calibration interface 16 is installed on the outer housing 1 for connection to an external calibration device. By setting the calibration path, the internal dust concentration detection unit 6 of the respirable dust concentration measurement device can be calibrated without disassembling the device, which is convenient for operation.

[0052] When measuring the concentration of respirable dust, the calibration interface 16 is blocked by a nut. The dust exhaust passage electric valve 12 is closed, and the dust measurement passage electric valve 8 is opened. The eddy current fan is powered on and operates. The dusty air enters the separator 20 under the suction of the eddy current fan. After separation, the coarse particulate dust is deposited in the dust ash box. The respirable dust enters the dust concentration detection unit 6 through the corresponding pipe section of the dust measurement passage, and then is discharged into the atmosphere through the dust measurement passage electric valve 8 and the eddy current fan.

[0053] After the measurement of respirable dust concentration is completed, the respirable dust concentration measuring device can enter the dust removal mode. The calibration interface 16 is blocked by a nut. The electric valve 12 of the dust removal path is opened, the electric valve 8 of the dust measurement path is closed, and the axial flow fan is powered on. Under the suction of the axial flow fan, air enters from the separator assembly 2. The airflow drives the coarse particulate dust accumulated in the inner cavity of the ash storage box and is discharged into the atmosphere through the electric valve 12 of the dust removal path, the corresponding pipe sections of the dust removal path, and the axial flow fan. By actively cleaning the dust inside the sensor device, long-term online operation can be ensured.

[0054] When the respirable dust concentration measuring device is being calibrated: the electric valve 12 of the dust removal path is closed, the electric valve 8 of the dust measurement path is closed, and the calibration device is connected using the calibration interface 16. Under the suction of the calibration device, the dusty air enters from the separator assembly 2. The coarse particulate dust is deposited in the ash storage cavity, and the respirable dust enters the dust concentration detection unit 6 through the corresponding pipe sections of the dust measurement pipeline and then enters the calibration device through the calibration path to calibrate the dust concentration detection unit 6 through the calibration device.

[0055] In other embodiments, the guide wall can also be provided with more than three layers.

[0056] In other embodiments, the diversion holes on the two guide walls can also be staggered up and down.

[0057] In other embodiments, the diversion holes can also be round holes.

[0058] In other embodiments, the outer casing can also be omitted. At this time, the diversion holes of the outermost guide wall form the channel inlet, and the channel inlet faces horizontally outward.

[0059] In other embodiments, the outer casing can also be integrally formed with the compression nut, and the inner casing can also be integrally formed with the connecting ring.

[0060] Embodiment of the respirable dust separator assembly of the present utility model:

[0061] The respirable dust separator assembly is the same as the separator assembly in the embodiment of the above-mentioned respirable dust concentration measuring device and will not be elaborated here.

[0062] Embodiment of the protective shell of the respirable dust separator of the present utility model:

[0063] The protective shell of the respirable dust separator is the same as the protective shell in the embodiment of the above-mentioned respirable dust concentration measuring device and will not be elaborated here.

[0064] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative efforts, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A protective shell for a respirable dust separator, characterized in that: The protective shell is provided with a shell cavity for sealing a cover arranged at the air inlet portion of the respirable dust separator, and the protective shell is provided with an airflow channel connected to the shell cavity for allowing dust-containing gas to enter the respirable dust separator, and the protective shell includes at least two layers of guide walls arranged inside and outside, wherein the innermost layer of the guide wall forms a part of the cavity wall of the shell cavity, and the airflow channel includes guide holes respectively arranged on each guide wall, the guide holes on two adjacent layers of the guide walls are staggered, and a dust collecting space is provided between the two adjacent layers of the guide walls at the lower side of the guide holes.

2. The protective shell of the respirable dust separator according to claim 1 is characterized in that: The guide wall is an annular structure, and the guide holes on two adjacent guide walls are staggered in the radial direction of the guide wall.

3. The protective shell of the respirable dust separator according to claim 2 is characterized in that: The guide hole is a long hole extending axially along the guide wall.

4. The protective shell of the respirable dust separator according to claim 1, 2 or 3, characterized in that: The airflow channel has a channel inlet, and the channel inlet is arranged downward.

5. The protective shell of the respirable dust separator according to claim 4 is characterized in that: The airflow channel comprises at least two direction-changing sections located upstream of the guide hole in the flow direction of the dust-laden gas, and the extension directions of two adjacent direction-changing sections are arranged at an angle.

6. The protective shell of the respirable dust separator according to claim 5 is characterized in that: The protective shell comprises an inner shell and an outer shell sleeved outside the inner shell, the guide wall is arranged on the inner shell, and the inner shell and the outer shell are provided with parts for enclosing the deflection section and the channel inlet.

7. A respirable dust separator assembly comprising a respirable dust separator, characterized in that: It also includes the respirable dust separator protective shell according to any one of claims 1 to 6.

8. Respirable dust concentration measuring equipment, characterized in that: The protective shell of the respirable dust separator comprises the protective shell of any one of claims 1 to 6.

9. The respirable dust concentration measuring device according to claim 8, characterized in that: An outer cover is also arranged outside the protective shell, and a hole structure is arranged on the outer cover.

10. The respirable dust concentration measuring device according to claim 9, characterized in that: The upper end of the outer shell of the respirable dust concentration measuring device is provided with a fixing structure for fixing the outer cover, and a water gap is provided between the lower end of the outer cover and the upper surface of the outer shell.

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