CN214249688U

CN214249688U - Powder conveying pipe and dust concentration detection system

Info

Publication number: CN214249688U
Application number: CN202022626948.1U
Authority: CN
Inventors: 单茂祥; 李硕; 邱文林; 马松玲; 王利群
Original assignee: Inner Mongolia Mengda Power Generation Co ltd
Current assignee: Inner Mongolia Mengda Power Generation Co ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-09-21
Anticipated expiration: 2030-11-13

Abstract

The utility model provides a defeated powder pipe and dust concentration detecting system relates to dust concentration detection technical field. This defeated powder pipe includes the body, and the pipe wall of body is equipped with detects the mouth, and the body is located the intercommunication in detection mouth and has the plug pipe, and plug switch is installed to the plug pipe, and plug switch is used for changing the shutoff state of plug pipe, and is used for inserting the dust concentration detector when the plug pipe intercommunication. This dust concentration detecting system includes dust concentration detector and above-mentioned defeated powder pipe, and when the grafting pipe intercommunication of defeated powder pipe, dust concentration detector matches and pegs graft in the grafting pipe. When this defeated powder pipe used, can regularly use dust concentration detector to detect the dust concentration in the body, can enough guarantee that the dust concentration is in the preferred scope in the body, can reduce dust concentration detector again and install in the body on line, the dust is real-time to the wearing and tearing that the insertion end produced to the life of extension dust concentration detector, the corresponding cost of changing the dust concentration detector and producing that reduces.

Description

Powder conveying pipe and dust concentration detection system

Technical Field

The utility model relates to a dust concentration detection technical field particularly, relates to a defeated powder pipe and dust concentration detecting system.

Background

In the thermal power factory, the export of coal pulverizer is generally through powder pipe and combustor intercommunication, the buggy that the coal pulverizer ground can supply the coal to the combustor through the powder pipe, wherein, the buggy concentration in the powder pipe can react the powder pipe and send into the balanced degree of combustor buggy volume, and the balanced degree of sending into combustor buggy volume directly influences the combustion efficiency of combustor and the operation security of combustor, and can also decide the height of generating cost, consequently, the subassembly operation in-process that generates electricity, the measurement of buggy concentration in the powder pipe is vital.

In the prior art, generally, be fixed in the dust concentration detector on the powder pipe, the part that the dust concentration detector inserted in the powder pipe is through contacting with buggy air current to carry out real-time detection to the buggy concentration in the powder pipe, however the coal granule in the buggy air current can cause wearing and tearing to the inserted part of dust concentration detector, leads to its measuring function weak or even inefficacy, and correspondingly, the life of dust concentration detector is shorter, and the replacement cost is higher.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a defeated powder pipe and dust concentration detecting system to the solution is installed in the short, the high technical problem of replacement cost of dust concentration detector life of powder pipe.

In order to solve the problem, the utility model provides a defeated powder pipe, which comprises a pipe body, the pipe wall of body is equipped with the detection mouth, the body in detection mouth department intercommunication has the grafting pipe, the shutoff switch is installed to the grafting pipe, the shutoff switch is used for changing the shutoff state of grafting pipe, just be used for inserting dust concentration detector during the grafting pipe intercommunication.

Optionally, the plugging switch includes a ball valve, the insertion pipe includes a first pipe section and a second pipe section, the ball valve is connected between the first pipe section and the second pipe section, and one end of the first pipe section departing from the ball valve is communicated with the pipe body.

Optionally, the second pipe section has a pipe inner diameter smaller than the pipe inner diameter of the first pipe section.

Optionally, the one end that the grafting pipe deviates from the body is equipped with locking seal spare, locking seal spare is used for with dust concentration detector lock in the grafting pipe to the shutoff dust concentration detector with between the grafting pipe.

Optionally, the locking sealing element comprises a locking cap and a sealing ring, the locking cap comprises an end plate and a side surrounding ring arranged around the end plate, the end plate is provided with an insertion hole for the dust concentration detector to pass through, and the inner wall of the side surrounding ring is provided with an internal thread; the pipe of pegging graft deviates from the tip of body is the link, the link is equipped with the external screw thread, the side enclose the ring with the link screw thread connects soon, the sealing ring clamp is located the end plate with between the terminal surface of link, just the sealing ring shutoff dust concentration detector with peg graft between the pipe.

Optionally, one end of the insertion hole facing the seal ring is provided with a first flaring section, and the inner wall of the hole corresponding to the first flaring section is a first inclined guide surface; a second flaring section is arranged at one end, facing the locking cap, of the insertion pipe, and the inner wall of the pipe corresponding to the second flaring section is a second inclined guide surface;

a first locking surface is arranged between the end surface of the sealing ring facing the insertion hole and the outer side wall of the sealing ring, and the first locking surface is matched with the first inclined guide surface; the sealing ring faces towards the end face of the inserting pipe and a second locking face is arranged between the outer side wall of the sealing ring, and the second locking face is matched with the second inclined guide face.

Optionally, the sealing ring is a copper ring, and the copper ring is connected with a ground wire.

The utility model also provides a dust concentration detecting system, including dust concentration detector and the defeated powder pipe of the aforesaid, during the pipe intercommunication of pegging graft of defeated powder pipe, dust concentration detector match peg graft in peg graft the pipe.

Optionally, a containing space is arranged in a charge probe rod of the dust concentration detector, a thermal resistor is arranged in the containing space, and the thermal resistor is connected with a display module of the dust concentration detector.

Optionally, an outer sleeve of the dust concentration detector is provided with a limiting boss, and when the dust concentration detector is inserted into the insertion pipe, the limiting boss is blocked at the end of the insertion pipe.

The utility model provides an in-process of powder is carried to defeated powder pipe can regularly use dust concentration detector to detect the dust concentration in the body, can enough guarantee that the dust concentration is in the preferred scope in the body, can reduce again that dust concentration detector installs in the body on line, and the dust produces the emergence of the wearing and tearing condition to inserting end of dust concentration detector in real time in the body to prolong the life of dust concentration detector, the corresponding cost of changing the dust concentration detector and producing that reduces. In addition, the arrangement of the inserting pipe on the powder conveying pipe can be used as an installation seat to guide and fix the position of the dust concentration detector, which is installed on the pipe body, so that the convenience of assembling and disassembling the dust concentration detector is improved, and the dust concentration detector is not required to be directly connected with the pipe body during installation, so that the influence on the sealing performance of the pipe body is effectively reduced; on the other hand, install the shutoff switch on the grafting pipe, the shutoff state that the shutoff switch can change the grafting pipe fast, the installation of dust concentration detector of not only being convenient for, can also block the grafting pipe fast to reduce the leakage of dust in the body, thereby improve defeated powder pipe's use convenience and functionality greatly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic view of a connection between a dust concentration detector and a dust conveying pipe in a dust concentration detection system provided by the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a partial schematic view of the powder conveying pipe provided by the present invention;

fig. 4 is a partial cross-sectional view of a first viewing angle of a dust concentration detector in the dust concentration detection system provided by the present invention;

fig. 5 is a schematic diagram of a second view angle of the dust concentration detector in the dust concentration detection system provided by the present invention;

fig. 6 is a schematic view of the dust concentration detector in the dust concentration detection system according to the present invention, when the outer sleeve is provided with the limiting boss.

Description of reference numerals:

100-a tube body; 110-a detection port; 200-a plug tube; 210-a first pipe section; 220-a second pipe section; 221-a second inclined guide surface; 300-ball valve; 400-locking the seal; 410-a locking cap; 411-end plate; 412-an insertion hole; 413 — a first inclined guide surface; 414-side coaming; 420-a sealing ring; 421-a first locking surface; 422-a second locking surface; 500-dust concentration detector; 510-a display module; 511-display screen; 512-a housing; 513-a battery cover; 514-power switch; 520-a charge probe; 521-a threaded section; 530-thermal resistance; 540-outer sleeve; 550-a ceramic bushing; 560-insulating platen; 570-fixed seat; 580-limiting boss.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment provides a powder conveying pipe, as shown in fig. 3, including body 100, the pipe wall of body 100 is equipped with detection mouth 110, and body 100 has plug tube 200 in detection mouth 110 department intercommunication, and plug tube 200 installs the shutoff switch, and the shutoff switch is used for changing the shutoff state of plug tube 200, and is used for inserting dust concentration detector 500 when plug tube 200 communicates.

The embodiment further provides a dust concentration detection system, as shown in fig. 1 and 2, which includes a dust concentration detector 500 and the above-mentioned powder conveying pipe, and when the insertion pipe 200 of the powder conveying pipe is communicated, the dust concentration detector 500 is inserted into the insertion pipe 200 in a matching manner.

The powder conveying pipe and the dust concentration detection system provided by the embodiment, wherein the powder conveying pipe comprises a pipe body 100 for circulating dust such as pulverized coal, a plug pipe 200 for installing a dust concentration detector 500 is arranged on the pipe body 100, and a plugging switch capable of controlling the plugging state of the plug pipe 200 is arranged on the plug pipe 200; the dust concentration detection system comprises a dust concentration detector 500 for detecting the dust concentration and the powder conveying pipe, wherein when a plugging switch in the powder conveying pipe is opened, the dust concentration detector 500 can be plugged into the plugging pipe 200 to measure the dust concentration in the pipe body 100.

Taking the example that the pulverized coal conveying pipe is communicated between the coal pulverizer and the burner as an example, the pulverized coal ground by the coal pulverizer is blown into the pulverized coal conveying pipe by the blowing device and then flows into the burner for burning, when the blowing device is started or the coal pulverizer and the burner are overhauled, as shown in fig. 1 and fig. 2, the plugging switch can be opened, the plugging pipe 200 is in a communicated state, the dust concentration detector 500 is inserted into the plugging pipe 200, the insertion end of the dust concentration detector 500 extends into the pipe body 100 through the detection port 110, the concentration of the dust concentration detector 500 is measured by contacting with the pulverized coal in the pipe body 100, so as to obtain the concentration of the pulverized coal in the pipe body 100, when the concentration of the pulverized coal is larger or smaller, the blowing device can be adjusted until the concentration of the pulverized coal in the pipe body 100 reaches the preferred concentration required by the burner, at this time, the balance degree of the amount of the pulverized coal entering the burner is higher, and the combustion efficiency of the burner is higher, and the safety of the combustion process of the burner is higher. After the adjustment is finished, the blowing device operates at the power, the concentration of the pulverized coal in the pipe body 100 can be stably maintained within a certain concentration range, and the combustor can correspondingly operate at higher combustion efficiency; the dust concentration detector 500 can be pulled out, and the plugging switch is closed, as shown in fig. 3, the plugging pipe 200 is in a plugging state, and accordingly, the detection port 110 of the pipe body 100 is plugged, so that the sealing state of the pipe body 100 is ensured, and the occurrence of the condition that the pulverized coal in the pipe body 100 leaks outwards through the detection port 110 is reduced.

In the continuous operation process of coal pulverizer and combustor, can regularly use dust concentration detector 500 to detect the buggy concentration in the body 100, can enough guarantee that buggy concentration is in the preferred scope in the body 100, can reduce again that dust concentration detector 500 is installed in body 100 on line, the real-time emergence to the inserting end production wearing and tearing condition of dust concentration detector 500 of buggy in the body 100 to prolong dust concentration detector 500's life, the corresponding cost that changes dust concentration detector 500 and produce that reduces. In addition, the arrangement of the insertion pipe 200 on the powder conveying pipe can be used as an installation seat to guide and fix the position of the dust concentration detector 500 installed on the pipe body 100, so that the convenience of assembling and disassembling the dust concentration detector 500 is improved, and the dust concentration detector 500 is not required to be directly connected with the pipe body 100 in the installation process, so that the influence on the sealing performance of the pipe body 100 is effectively reduced; on the other hand, install the shutoff switch on the grafting pipe 200, the shutoff switch can change the shutoff state of grafting pipe 200 fast, not only is convenient for the installation of dust concentration detector 500, can also block grafting pipe 200 fast to reduce the leakage of buggy in the body 100, thereby improve defeated powder pipe's use convenience and functionality greatly.

Specifically, the dust concentration detector 500 may be a static inductor, as shown in fig. 4 and fig. 6, the static inductor may include a display module 510 and an induction module, where the display module 510 includes a housing 512 and a display screen 511 disposed on the housing 512, a filter, an amplifier, an a/D converter, a processor, and the like are installed in the housing 512, and the processor is connected to the display screen 511; the induction module can comprise a charge probe 520 made of metal, a threaded section 521 is arranged at the top end of the metal probe, the threaded section 521 is connected with the shell 512 through a nut, and an insulating pressing plate 560 is arranged between the nut and the shell 512; the upper region of the charge probe 520 is covered with an outer sleeve 540, a ceramic sleeve 550 is arranged between the lower opening of the outer sleeve 540 and the charge probe 520, and the lower end of the charge probe 520 extends downwards out of the ceramic sleeve 550. During detection, a rod body formed by the outer sleeve 540, the ceramic sleeve 550 and the charge probe 520 is inserted into the insertion tube 200, wherein the lower end of the metal probe extends into the tube body 100 to contact with the pulverized coal airflow for concentration detection. Preferably, the bottom of the housing 512 may be provided with a fixing seat 570, and a rod body formed by the outer sleeve 540, the ceramic sleeve 550 and the charge detecting rod 520 may be based on the fixing seat 570 and connected to the top end of the fixing seat 570, so as to improve the connection firmness and stability between the rod body and the housing 512.

Preferably, the housing 512 may be provided with a battery cavity, a battery is loaded in the battery cavity, as shown in fig. 5, and the battery cavity is covered by a battery cover 513; the housing 512 may also be provided with a power switch 514 for controlling the power on/off state to reduce power consumption during standby mode. When the processor is arranged in the shell 512, the battery supplies power to each electronic element, the dust concentration detector 500 is an independent part, and the dust concentration detector is not limited by an external power supply and the like when in use, so that a user can conveniently carry the dust concentration detector and use the dust concentration detector at multiple places, and the use convenience is improved; the processor can also be wirelessly connected with a computer or a monitoring station of a centralized control room and the like, and transmits the concentration signal detected by the processor to the computer or the monitoring station so as to facilitate checking and data comparison and storage; in addition, the processor may be disposed outside, and the display module 510 of the dust concentration detector 500 and the processor may be connected wirelessly to transmit and convert the charge signal, and the obtained concentration signal may be displayed on the display screen 511. The dust concentration detector 500 can be used for detecting the concentration of flue gas in a flue besides being used for detecting a powder conveying pipe.

Alternatively, in this embodiment, as shown in fig. 4, an accommodating space may be provided in the charge probe 520 of the dust concentration detector 500, a thermal resistor 530 is provided in the accommodating space, and the thermal resistor 530 is connected to the display module 510 of the dust concentration detector 500. The bottom end of the charge probe 520 is sealed, and the inside of the charge probe is hollow to form an accommodation space, a thermal resistor 530 is arranged in the accommodation space, the thermal resistor 530 is fully contacted with the charge probe 520, when the dust concentration detector 500 is inserted into the tube 100 and is contacted with the coal dust airflow, besides the concentration detection is carried out by inducing electrostatic charges, the charge probe 520 made of metal can transmit the temperature of the coal dust airflow to the thermal resistor 530, the thermal resistor 530 represents a corresponding resistance value and transmits a resistance signal to a processor of the display module 510, the processor acquires a corresponding temperature value according to the resistance signal, the temperature value can be displayed by the display screen 511 and can be transmitted to a computer or a monitoring console by wireless, the processor, the computer or the monitoring console and the like can calculate parameters such as the flow speed, the flow rate and the like of the coal dust airflow according to the temperature, so as to more comprehensively know the properties of the coal dust fluid in the tube 100, and then can carry out more accurate regulation to it, make its and the matching nature of combustor higher, correspondingly further improve the combustion efficiency and the operation security of combustor.

Specifically, in this embodiment, as shown in fig. 3, the plugging switch may include a ball valve 300, the plug tube 200 includes a first tube segment 210 and a second tube segment 220, the ball valve 300 is connected between the first tube segment 210 and the second tube segment 220, and an end of the first tube segment 210 facing away from the ball valve 300 is communicated with the tube body 100. When detection is needed, the ball valve 300 is opened, a valve core of the ball valve 300 rotates, a through hole in the valve core is approximately coaxial with the first pipe section 210 and the second pipe section 220, and the dust concentration detector 500 can sequentially penetrate through the second pipe section 220, the through hole of the ball valve 300 and the first pipe section 210 and then extend into the pipe body 100 to perform contact measurement on the concentration of the pulverized coal in the pipe body 100; after the measurement is finished, the dust concentration detector 500 is pulled out, the ball valve 300 is closed, and the valve core rotates to be in a blocking state. The ball valve 300 is selected as the plugging switch, so that the cost is low, and the use is convenient; the second pipe 100 is used for guiding and limiting the insertion of the dust concentration detector 500, so that the dust concentration detector 500 can be inserted into the through hole of the valve core in a matched manner, and then the first pipe section 210 extends into the pipe 100.

Of course, the plugging switch may also be in other forms besides the ball valve 300, for example, the plugging switch is a plugging plug which is matched with the insertion end of the insertion tube 200, and when detection is not required, the plugging plug can be plugged at the nozzle of the insertion tube 200; when detection is needed, the plug is pulled out, and the dust concentration detector 500 is inserted. Or, a plugging sheet may be hinged inside the tube body 100, and a hinge shaft of the plugging sheet is connected with the driving member, so that when detection is not needed, the driving member drives the hinge shaft to drive the plugging sheet to synchronously rotate to the detection port 110 to plug the plugging sheet; when the detection is needed, the driving part drives the hinge shaft to drive the plugging sheet to synchronously rotate to the region outside the detection port 110, and the inserting pipe 200 is inserted into the dust concentration detector 500 for detection.

In this embodiment, as shown in fig. 1 and 3, the second pipe section 220 may have a smaller pipe inner diameter than the first pipe section 210. The second pipe section 220 can guide and limit the insertion of the dust concentration detector 500, the second pipe section 220 is in clearance fit with the outer sleeve 540 of the dust concentration detector 500, on the basis of ensuring that the outer sleeve 540 is inserted into the second pipe section 220, the position accuracy of the dust concentration detector 500 in the insertion pipe 200 can be effectively improved, and the accuracy of inserting the outer sleeve 540 into the through hole of the ball valve 300 is correspondingly ensured; on the other hand, the arrangement can effectively improve the connection sealing performance of the outer sleeve 540 and the second pipe section 220 by reducing the gap between the outer sleeve and the second pipe section, thereby reducing the influence of the leakage of the coal dust in the pipe body 100 through the gap on the measurement precision; on the other hand, the inner diameter of the first pipe section 210 is larger than the inner diameter of the second pipe section 220, and the outer sleeve 540 can smoothly penetrate through the first pipe section 210 and extend into the pipe body 100 after being inserted into the second pipe section 220, so that the smoothness of installing the outer sleeve 540 into the insertion pipe 200 is improved.

In this embodiment, as shown in fig. 1 to fig. 3, a locking sealing member 400 is disposed at an end of the insertion tube 200 away from the tube body 100, and the locking sealing member 400 is used to lock the dust concentration detector 500 to the insertion tube 200 and block a gap between the dust concentration detector 500 and the insertion tube 200. After the dust concentration detector 500 is inserted into the insertion tube 200, the position of the dust concentration detector 500, which is mounted on the insertion tube 200, can be locked by using the locking sealing member 400, so that the depth of the charge probe rod 520 inserted into the tube body 100 in the dust concentration detector 500 is adjusted and locked, the accuracy of the metal probe rod induced charge is improved, and the detection accuracy of the dust concentration detector 500 on the coal dust concentration is improved. In addition, the locking seal 400 can also seal the gap between the outer sleeve 540 and the insertion pipe 200, so that the sealing performance of the dust concentration detector 500 when the dust concentration detector is installed on the pipe body 100 is improved, the stability of the pulverized coal gas flow in the pipe body 100 is ensured through improvement, and the accuracy of the pulverized coal concentration detected by the dust concentration detector 500 is further improved.

In this embodiment, as shown in fig. 1 to 3, the locking seal 400 may include a locking cap 410 and a sealing ring 420, the locking cap 410 includes an end plate 411 and a side surrounding ring surrounding the end plate 411, the end plate 411 is provided with an insertion hole 412 for the dust concentration detector 500 to pass through, and the inner wall of the side surrounding ring is provided with an internal thread; the tip that grafting pipe 200 deviates from body 100 is the link, and the link is equipped with the external screw thread, and side surrounding ring connects with the link screw thread soon, and sealing ring 420 presss from both sides and locates between the terminal surface of end plate 411 and link, and between sealing ring 420 shutoff dust concentration detector 500 and the grafting pipe 200. In this embodiment, the locking seal 400 is a specific form, and initially, the locking cap 410 may be screwed to the connection end, the sealing ring 420 is located in the locking cap 410, and the sealing ring 420 is in a loose state; when the detection is needed, the rod body part of the dust concentration detector 500 can sequentially penetrate through the insertion hole 412 of the locking cap 410 and the ring of the sealing ring 420 to be inserted into the insertion pipe 200, then the locking cap 410 is screwed, the end plate 411 of the locking cap 410 presses the sealing ring 420 towards the end face of the connecting end, the sealing ring 420 is extruded to deform to a certain degree and is extruded towards the rod body part, the depth of the rod body part inserted into the insertion pipe 200 can be locked, the gap between the rod body part of the dust concentration detector 500 and the insertion pipe 200 can be sealed in a sealing mode, the connection tightness of the rod body part and the insertion pipe 200 is improved, the occurrence of the condition that pulverized coal airflow in the pipe body 100 leaks through the gap between the rod body part and the insertion pipe 200 is further reduced, and the accuracy of the pulverized coal concentration detected by the dust concentration detector 500 is further ensured. After the detection is finished, the locking cap 410 can be unscrewed (or can be directly unscrewed), the sealing ring 420 is not squeezed and is in a loose state, the rod body part is not correspondingly squeezed any more, and the dust concentration detector 500 is pulled out outwards.

Of course, in other embodiments, the locking seal 400 may also take other forms, for example, the locking seal 400 may include a plurality of elastic compression members and a plurality of arc-shaped sealing blocks, the plurality of elastic compression members are circumferentially connected to the pipe wall of the connecting end, and the inner end of each elastic compression member is connected to one arc-shaped sealing block, the plurality of arc-shaped sealing blocks are spliced to form a sealing ring, and the sealing ring is located in the inner region of the end pipe orifice of the connecting end and is approximately concentrically arranged with the end pipe orifice. When the rod body part needs to be inserted, the rod body part is inserted into the sealing ring and downwards inserted into the insertion tube 200, the arc-shaped sealing block inwards extrudes the rod body part under the extrusion action of the elastic compression piece towards the rod body part, and then a gap between the rod body part and the insertion tube 200 is sealed in a sealing mode.

In this embodiment, as shown in fig. 2, one end of the insertion hole 412 facing the sealing ring 420 is provided with a first flared section, and the inner wall of the hole corresponding to the first flared section is a first inclined guide surface 413; a second flared section is arranged at one end of the insertion tube 200 facing the locking cap 410, and a second inclined guide surface 221 is arranged on the inner wall of the tube corresponding to the second flared section; a first locking surface 421 is arranged between the end surface of the sealing ring 420 facing the insertion hole 412 and the outer side wall of the sealing ring 420, and the first locking surface 421 is matched with the first inclined guide surface 413; a second locking surface 422 is arranged between the end surface of the sealing ring 420 facing the insertion tube 200 and the outer side wall of the sealing ring 420, and the second locking surface 422 is matched with the second inclined guide surface 221. When the rod body portion of the dust concentration detector 500 is inserted into the insertion tube 200 and the insertion depth is determined, tightening the locking cap 410, the locking cap 410 is rotated toward the connection end until the first inclined guide surface 413 of the locking cap 410 contacts the first locking surface 421, and the second inclined guide surface 221 of the connection end contacts the second locking surface 422, because the first inclined guide surface 413 of the locking cap 410 and the second inclined guide surface 221 of the connection end are oppositely arranged and inclined towards the rod body portion, the locking cap 410 is continuously screwed, and as the distance between the first inclined guide surface 413 and the second inclined guide surface 221 decreases, the first inclined guide surface 413 and the second inclined guide surface 221 respectively cooperate with the first locking surface 421 and the second locking surface 422 to push the sealing ring 420 towards the direction of the rod body portion, and the sealing ring 420 is correspondingly pressed towards the rod body portion to lock the locking ring and seal the gap between the sealing ring and the insertion tube 200. After the detection is finished, the locking cap 410 can be unscrewed, the first inclined guide surface 413 and the second inclined guide surface 221 are not pressed to push the sealing ring 420, the sealing ring 420 is correspondingly restored to the initial position, the rod body part is not pressed, and the rod body part is pulled out. Above-mentioned first slope spigot surface 413, second slope spigot surface 221, first locking surface 421 and second locking surface 422's setting can realize through the locking cap 410 of screwing that sealing ring 420 locks and seals the body of rod part, and locking and sealed effectual, and simple structure, simple operation.

Alternatively, in this embodiment, the sealing ring 420 may be a copper ring, and the copper ring is connected with a ground wire. On one hand, the sealing ring 420 is made of a copper material, the copper material has good ductility, when the sealing ring 420 is extruded by the locking cap 410 and the connecting end, the sealing ring can deform to extrude, lock and seal the rod body part, and when the sealing ring 420 is not extruded any more, the sealing ring can recover the deformation and does not extrude the rod body part any more; on the other hand, the wire performance of copper material is higher, when dust concentration detector 500 uses, the inner wall of sealing ring 420 fully extrudes and contacts with the outer wall of outer tube 540 of the body of rod part, through grounding the earth conductor, realize the effective ground connection operation of body of rod part outer tube 540, thereby ensure the normal use of dust concentration detector 500 (when outer tube 540 is not grounded through sealing ring 420, can pass through other modes, such as directly connect earth conductor on outer tube 540, etc., in order to realize the ground connection operation of outer tube 540), then the setting of sealing ring 420 can realize the locking of the body of rod part inserting the interior degree of depth of splicing tube 200 simultaneously, the shutoff of clearance between body of rod part and splicing tube 200 is sealed and effectively ground connection to outer tube 540, three purposes, simple structure, high practicability.

Optionally, in this embodiment, as shown in fig. 6, the outer sleeve 540 of the dust concentration detector 500 is provided with a limiting boss 580, and when the dust concentration detector 500 is inserted into the insertion tube 200, the limiting boss 580 blocks the end of the insertion tube 200. When the outer sleeve 540 is inserted into the insertion tube 200, the limiting boss 580 interferes with and abuts against the end face of the insertion tube 200, and the outer sleeve 540 cannot be correspondingly inserted into the insertion tube 200, so that the depth of the outer sleeve 540 inserted into the insertion tube 200 is limited, the depth of the charge probe 520 extending into the tube body 100 is correspondingly increased, and effective contact detection of the charge probe to pulverized coal airflow is ensured; after the limiting boss 580 primarily limits the insertion depth of the outer sleeve 540, the locking and sealing member 400 can be used to lock and seal the outer sleeve 540, so as to improve the stability of the insertion depth of the outer sleeve 540 into the insertion tube 200. Of course, when the locking seal 400 is located at the end of the insertion end, the limit boss 580 may interfere with and abut against the end surface of the locking seal 400; and the limit boss 580 may be an annular boss extending along the circumferential direction of the outer sleeve 540, or may be an outwardly protruding boss.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The powder conveying pipe is characterized by comprising a pipe body (100), wherein a detection port (110) is formed in the pipe wall of the pipe body (100), an insertion pipe (200) is communicated with the detection port (110) of the pipe body (100), a plugging switch is installed on the insertion pipe (200), the plugging switch is used for changing the plugging state of the insertion pipe (200), and the insertion pipe (200) is used for being inserted into a dust concentration detector (500) when being communicated.

2. The powder conveying pipe according to claim 1, wherein the blocking switch comprises a ball valve (300), the insertion pipe (200) comprises a first pipe section (210) and a second pipe section (220), the ball valve (300) is connected between the first pipe section (210) and the second pipe section (220), and one end of the first pipe section (210) facing away from the ball valve (300) is communicated with the pipe body (100).

3. The powder delivery tube of claim 2, wherein the second tube section (220) has a tube inner diameter that is smaller than a tube inner diameter of the first tube section (210).

4. The powder conveying pipe according to any one of claims 1 to 3, wherein a locking sealing member (400) is disposed at an end of the insertion pipe (200) away from the pipe body (100), and the locking sealing member (400) is used for locking the dust concentration detector (500) to the insertion pipe (200) and blocking a gap between the dust concentration detector (500) and the insertion pipe (200).

5. The powder conveying pipe according to claim 4, wherein the locking sealing member (400) comprises a locking cap (410) and a sealing ring (420), the locking cap (410) comprises an end plate (411) and a side surrounding ring surrounding the end plate (411), the end plate (411) is provided with an insertion hole (412) for the dust concentration detector (500) to pass through, and the inner wall of the side surrounding ring is provided with an internal thread; the end part of the insertion pipe (200) departing from the pipe body (100) is a connecting end, the connecting end is provided with external threads, the side surrounding ring is screwed with the connecting end threads, the sealing ring (420) is clamped between the end plate (411) and the end face of the connecting end, and the sealing ring (420) blocks the dust concentration detector (500) and the insertion pipe (200).

6. The powder conveying pipe according to claim 5, characterized in that the insertion hole (412) is provided with a first flared section at an end facing the sealing ring (420), and the inner wall of the hole corresponding to the first flared section is a first inclined guide surface (413); a second flaring section is arranged at one end, facing the locking cap (410), of the insertion pipe (200), and the inner wall of the corresponding pipe of the second flaring section is a second inclined guide surface (221);

a first locking surface (421) is arranged between the end surface of the sealing ring (420) facing the insertion hole (412) and the outer side wall of the sealing ring (420), and the first locking surface (421) is matched with the first inclined guide surface (413); and a second locking surface (422) is arranged between the end surface of the sealing ring (420) facing the insertion pipe (200) and the outer side wall of the sealing ring (420), and the second locking surface (422) is matched with the second inclined guide surface (221).

7. The powder conveying pipe according to claim 6, wherein the sealing ring (420) is a copper ring, and a grounding wire is connected to the copper ring.

8. A dust concentration detection system, characterized by comprising a dust concentration detector (500) and the powder conveying pipe of any one of claims 1 to 7, wherein when the insertion pipe (200) of the powder conveying pipe is communicated, the dust concentration detector (500) is inserted into the insertion pipe (200) in a matching manner.

9. The dust concentration detection system of claim 8, wherein a holding space is provided in the charge probe (520) of the dust concentration detector (500), a thermal resistor (530) is provided in the holding space, and the thermal resistor (530) is connected to the display module (510) of the dust concentration detector (500).

10. The dust concentration detection system of claim 8, wherein the outer sleeve (540) of the dust concentration detector (500) is provided with a limiting boss (580), and when the dust concentration detector (500) is inserted into the insertion tube (200), the limiting boss (580) is blocked at the end of the insertion tube (200).