A gas detector and method of detecting smoke particles

Abstract

The present application relates to the technical field of smoke detection, and specifically relates to a gas detector and a smoke particle detection method. The gas detector comprises a rack, a detector and a sleeve. A cylinder seat is fixedly arranged on the rack. The sleeve and the cylinder seat are coaxially movably matched. The detector is fixedly connected with the top of the sleeve through a swing plate. Driving mechanisms that are matched with the sleeve are arranged on the rack and the cylinder seat. The detector is communicated with a pumping mechanism, and the pumping mechanism is connected with the driving mechanisms. The present application integrates lifting, deflection and continuous pumping actions into a set of linkage mechanisms, so that the detector automatically completes two directional rotations in up-and-down strokes, and realizes spatial multi-angle scanning. The driving mechanisms and the pumping mechanism are matched with each other, so that the detector can actively suck in gas at each height and each angle, avoids dead angles and stagnant layers, and improves the capture probability of rare or layered smoke particles. The continuous working mode of pure mechanical coupling is simple to maintain, and is suitable for early fire warning in complex flow field environments.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of smoke detection, in particular to a gas detector and a smoke particle detection method. BACKGROUND

[0002] With the rapid increase of large space buildings, elevated warehouses, clean workshops and urban comprehensive pipe corridors, the traditional point-type smoke detector often has response lag or even misses due to limited installation height, large airflow disturbance and obvious smoke stratification. In order to improve sensitivity, the industry generally adopts the way of lengthening the sampling pipeline or adding multiple detectors, but this brings new problems such as pipeline dust accumulation, maintenance volume multiplication and cost increase.

[0003] In recent years, a liftable detection device has appeared, which drives the detector to make vertical reciprocating motion through a motor, trying to break the smoke stratification. However, the posture of the detector is fixed during the lifting process, and only the gas in a single vertical path can be collected. The smoke particles in the transverse diffusion or vortex area still cannot be collected. At the same time, the lifting and sampling actions are independent of each other, and an additional air pump needs to work continuously, which is high in energy consumption and noise, and the airflow inertia after lifting to the position easily leads to "over-suction" or "backflow" of the sampling port, affecting the judgment of the real concentration.

[0004] Another scheme is to add a rotating gimbal to the detector to realize circumferential scanning sampling, but the rotating mechanism and the lifting mechanism are separated, two sets of driving sources are needed, the structure is redundant, and the synchronous control is complex. The winding problem caused by rotation requires a long margin to be reserved for the air pipe, which increases the resistance and is easy to bend and block, and the reliability is poor. SUMMARY

[0005] The purpose of the present application is to provide a gas detector and a smoke particle detection method to solve the problems raised in the background.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A gas detector, comprising a rack, a detector and a sleeve, a cylinder seat is fixedly arranged on the rack, the sleeve and the cylinder seat are coaxially movably matched, and the detector is fixedly connected with the top of the sleeve through a swing plate;

[0008] A driving mechanism is arranged on the rack and the cylinder seat, and the driving mechanism cooperates with the sleeve;

[0009] When the driving mechanism operates, the sleeve slides out along the length direction of the cylinder seat, and extends to the upper stroke end, and then the sleeve rotates by a predetermined angle, and then the sleeve returns to the lower stroke end, and then the sleeve rotates by a predetermined angle again, so as to drive the detector to rotate and alternate lifting.

[0010] The detector is communicated with a pumping mechanism, and the pumping mechanism is connected with the driving mechanism to continuously pump air during the process that the detector is oriented, interval deflected and alternately lifted.

[0011] The gas detector as described above:

[0012] The driving mechanism comprises a rotating rod and a steel ball, the rotating rod is coaxially arranged in the inner part of the barrel seat, and the sleeve is arranged on the outer part of the rotating rod;

[0013] The steel ball is rollingly fitted in the inner wall of the sleeve, and the outer wall of the rotating rod is provided with a spiral groove along the length direction of the rotating rod, and the steel ball is also rollingly fitted in the spiral groove.

[0014] The gas detector as described above:

[0015] The outer wall of the sleeve is fixedly provided with a convex column, and the inner wall of the barrel seat is provided with a straight groove along the length direction of the barrel seat;

[0016] The straight grooves are arranged in multiple and uniformly distributed along the circumferential direction, and the convex column is slidingly fitted in one of the straight grooves.

[0017] The gas detector as described above:

[0018] The inner wall of the barrel seat is provided with a first arc-shaped groove along the circumferential direction, and the first arc-shaped grooves are arranged in multiple and uniformly distributed along the circumference;

[0019] The inner wall of the barrel seat is provided with a second arc-shaped groove along the circumferential direction, and the second arc-shaped grooves are arranged in multiple and uniformly distributed along the circumference, wherein the horizontal height of the second arc-shaped groove is less than the horizontal height of the first arc-shaped groove.

[0020] The gas detector as described above:

[0021] The first arc-shaped grooves and the second arc-shaped grooves are distributed in a staggered manner, and the two ends of the first arc-shaped grooves are respectively communicated with the top ends of the adjacent two straight grooves;

[0022] The two ends of the second arc-shaped grooves are respectively communicated with the bottom ends of the adjacent two straight grooves, and the straight grooves, the first arc-shaped grooves and the second arc-shaped grooves jointly form a "wavy shape" sliding groove.

[0023] The gas detector as described above:

[0024] The driving mechanism further comprises a circular cover and a circular disc, the circular cover is rotationally arranged on the frame, and the circular disc is coaxially fixedly arranged on the circular cover;

[0025] The bottom of the rotating rod is coaxially fixed with a connecting shaft, and the outer wall of the connecting shaft is coaxially fixed with a gear.

[0026] The gas detector as described above:

[0027] The inner circumferential surface of the circular cover is coaxially fixed with a first arc-shaped gear ring, and the outer wall of the circular disc is coaxially fixed with a second arc-shaped gear ring, and the gear is in mesh with the first arc-shaped gear ring;

[0028] When the circular cover rotates, the first arc-shaped gear ring drives the gear to rotate forward, and at the moment when the first arc-shaped gear ring is separated from the gear, the second arc-shaped gear ring is in mesh with the gear, thereby driving the gear to rotate reversely.

[0029] The gas detector as described above:

[0030] The pump mechanism comprises a hollow tube and a ring seat, the top end of the hollow tube is coaxially fixedly connected with the top of the sleeve, and the ring seat is coaxially sleeved on the bottom of the rotating rod and fixedly connected with the cylinder seat.

[0031] The bottom of the hollow tube is coaxially fixedly sleeved with a sealing ring, and the outer wall of the sealing ring is in close contact with the inner wall of the rotating rod.

[0032] The gas detector as described above:

[0033] The top end of the hollow tube is connected with the output end of the detector through a first conduit, and the bottom side wall of the rotating rod is provided with a plurality of through holes, and the plurality of through holes guide the inside of the rotating rod and the inside of the ring seat.

[0034] The frame is fixedly provided with a pump, the output end of the pump is coaxially fixedly connected with the circular cover, and the air inlet of the pump is guided through a second conduit and the side wall of the ring seat.

[0035] A smoke particle detection method using the above-mentioned gas detector, comprising the following steps:

[0036] Step one: start the pump and keep it running in one direction continuously, the pump rotates in a constant direction, and the output shaft synchronously drives the circular cover to rotate, providing a one-way torque for the driving mechanism, while the air inlet of the pump continuously sucks the ring seat through the second conduit, forming a stable negative pressure sampling channel between the detector, the first conduit, the hollow tube, the rotating rod cavity, the through hole, the ring seat, and the second conduit, and the negative pressure is uninterrupted throughout the detection process.

[0037] Step two: the driving mechanism transmits the one-way rotation of the pump through the mutual cooperation between the rotating rod, the spiral groove, the steel ball, the convex column, the first arc-shaped groove, the straight groove, the second arc-shaped groove, the round cover, the disc, the connecting shaft, the gear, the first arc-shaped gear ring and the second arc-shaped gear ring, so that the sleeve realizes the cyclic motion of "linearly rising - circumferential indexing - linearly descending - circumferential indexing" under the constraint of the wave-shaped chute;

[0038] Step three: the probe moves synchronously with the sleeve and continuously sucks the smoke-containing gas, the swing plate transmits the composite motion of the sleeve to the probe, so that the probe experiences high-position sampling, horizontal indexing, low-position sampling and horizontal indexing again in each cycle, thereby forming a spatial three-dimensional scanning, the hollow tube rises and falls with the sleeve, the sealing ring is always in sliding sealing with the inner wall of the rotating rod, so that the effective length of the negative pressure channel changes dynamically but does not leak, and the sampling port of the probe continuously inhales the gas containing smoke particles outside the entire motion range;

[0039] Step four: the cyclic motion completes the time sequence recording of the particle concentration at multiple points, when the sleeve completes the preset number of cycles, the probe has covered the entire circumferential range at fixed angular intervals and collected the gas at high and low levels, thereby obtaining a series of smoke particle concentration signals corresponding to positions, and sending the above time sequence signals to the rear processing unit, so that the spatial smoke distribution map can be drawn, and the rapid, dead-angle-free identification and positioning of early fire smoke in a large space can be realized.

[0040] Compared with the prior art, the beneficial effects of the present application are:

[0041] By integrating the lifting, deflection and continuous suction actions into a set of linkage mechanism, the probe automatically completes two directional rotations in the up and down strokes, and realizes spatial multi-angle scanning; the sleeve and the cylinder base are coaxially slidingly connected, which not only ensures stable lifting, but also realizes precise steering without additional power at the end by mechanical limiting, so that the structure is compact and the energy consumption is low; the driving mechanism and the pumping mechanism cooperate with each other, so that the probe can actively inhale the gas at each height and each angle, thereby avoiding dead angles and stagnant layers and improving the capture probability of thin or layered smoke particles; the whole does not need complex control program, and the continuous working mode of "lifting-rotating-sampling" can be realized by pure mechanical coupling, so that the maintenance is simple, the response is rapid, and the early fire warning in large space and complex flow field environment is suitable. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall structure of the gas detector;

[0043] Figure 2 It is a sectional view of the sleeve and the cylinder base in the gas detector;

[0044] Figure 3 It is Figure 2 the enlarged view of A in the middle;

[0045] Figure 4 Split view of sleeve, cylinder seat, rotating rod, hollow tube in gas detector;

[0046] Figure 5 Plan view of straight slot, No. 1 arc-shaped slot, No. 2 arc-shaped slot in gas detector;

[0047] Figure 6 Split view of sleeve, rotating rod in gas detector;

[0048] Figure 7 Sectional view of cylinder seat in gas detector;

[0049] Figure 8 Enlarged view of B in Figure 7

[0050] Figure 9 Schematic view of part of driving mechanism in gas detector;

[0051] Figure 10 Sectional view of sleeve, cylinder seat, rotating rod, ring seat in gas detector;

[0052] Figure 11 Enlarged view of C in Figure 10

[0053] In the figure: 1, frame; 2, detector; 3, sleeve; 4, cylinder seat; 401, straight slot; 402, No. 1 arc-shaped slot; 403, No. 2 arc-shaped slot; 5, swing plate; 6, rotating rod; 601, helical groove; 602, through hole; 7, steel ball; 8, protruding column; 9, round cover; 10, disc; 11, connecting shaft; 12, gear; 13, No. 1 arc-shaped gear ring; 14, No. 2 arc-shaped gear ring; 15, hollow tube; 16, ring seat; 17, sealing ring; 18, No. 1 guide pipe; 19, pump; 20, No. 2 guide pipe. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0055] Please refer to Figures 1-11 As an embodiment of the present application, a gas detector comprises a frame 1, a detector 2 and a sleeve 3, the frame 1 is fixedly provided with a cylinder seat 4, the sleeve 3 and the cylinder seat 4 are coaxially movably matched, and the detector 2 is fixedly connected with the top of the sleeve 3 through a swing plate 5.

[0056] The frame 1 and the cylinder seat 4 are provided with a driving mechanism, and the driving mechanism is matched with the sleeve 3. ​​

[0057] When the driving mechanism operates, the sleeve 3 slides out along the length direction of the cylinder seat 4 and extends to the upper stroke end, the sleeve 3 rotates a predetermined angle; then, when the sleeve 3 returns to the lower stroke end, the sleeve 3 rotates a predetermined angle again to drive the detector 2 to rotate and alternate lifting;

[0058] The detector 2 communicates with the pumping mechanism, and the pumping mechanism is connected with the driving mechanism to continuously pump air during the process of the detector 2 rotating and alternating lifting.

[0059] In this embodiment, the pumping mechanism is the only power source and keeps one-way continuous operation; one output is used to establish a sampling air flow to keep the detector 2 in the air pumping state, and the other output is connected to the driving mechanism;

[0060] The driving mechanism converts the one-way power of the pumping mechanism into a periodic linear motion to push the sleeve 3 to slide along the axis of the cylinder seat 4 upward, and when the sleeve 3 reaches the upper stroke end, the sleeve 3 rotates a predetermined angle under the action of the driving mechanism; then the driving mechanism drives the sleeve 3 to slide downward in the opposite direction, and when the sleeve 3 reaches the lower stroke end, the sleeve 3 rotates the same angle in the same direction again; the sleeve 3 completes a rotation at each end point of the linear reciprocating motion, and the detector 2 is driven by the swing plate 5 to realize the cycle of "lifting-rotation-lowering-re-rotation" synchronously, while the pumping mechanism continuously pumps air, and the detector 2 continuously inhales air during the whole process of lifting and rotating.

[0061] As a further scheme of the application, the driving mechanism includes a rotating rod 6 and a steel ball 7, the rotating rod 6 is coaxially arranged inside the cylinder seat 4, and the sleeve 3 is arranged outside the rotating rod 6;

[0062] The steel ball 7 is rollingly embedded in the inner wall of the sleeve 3, and the outer wall of the rotating rod 6 is provided with a spiral groove 601 along the length direction, and the steel ball 7 is also rollingly embedded in the spiral groove 601;

[0063] The outer wall of the sleeve 3 is fixedly provided with a convex column 8, and the inner wall of the cylinder seat 4 is provided with a straight groove 401 along the length direction;

[0064] The straight groove 401 is provided with a plurality of straight grooves 401 and is uniformly distributed in the circumferential direction, and the convex column 8 is slidably embedded in one of the straight grooves 401;

[0065] The inner wall of the cylinder seat 4 is provided with a first arc-shaped groove 402 along the circumferential direction, and the first arc-shaped groove 402 is provided with a plurality of arc-shaped grooves 402 and is uniformly distributed in the circumferential direction;

[0066] The inner wall of the barrel seat 4 is provided with a plurality of second arc-shaped grooves 403 which are uniformly distributed along the circumference, wherein the horizontal height of the second arc-shaped grooves 403 is less than that of the first arc-shaped grooves 402;

[0067] The plurality of first arc-shaped grooves 402 and the plurality of second arc-shaped grooves 403 are distributed in a staggered manner, and the two ends of the plurality of first arc-shaped grooves 402 are respectively connected to the top ends of the adjacent two straight grooves 401;

[0068] The two ends of the plurality of second arc-shaped grooves 403 are respectively connected to the bottom ends of the adjacent two straight grooves 401, and the plurality of straight grooves 401, first arc-shaped grooves 402 and second arc-shaped grooves 403 together form a "wave-like" sliding groove;

[0069] The driving mechanism further comprises a circular cover 9 and a circular disc 10, wherein the circular cover 9 is rotationally arranged on the rack 1, and the circular disc 10 is coaxially fixedly arranged on the circular cover 9;

[0070] The bottom of the rotating rod 6 is coaxially fixedly provided with a connecting shaft 11, the outer wall of the connecting shaft 11 is coaxially fixedly provided with a gear 12, and the outer wall of the gear 12 is respectively attached to the outer wall of the circular disc 10 and the inner wall of the circular cover 9;

[0071] The inner circumferential surface of the circular cover 9 is coaxially fixedly provided with a first arc-shaped gear ring 13, and the outer wall of the circular disc 10 is coaxially fixedly provided with a second arc-shaped gear ring 14, wherein the gear 12 and the first arc-shaped gear ring 13 are in meshing relationship;

[0072] When the circular cover 9 rotates, the first arc-shaped gear ring 13 drives the gear 12 to rotate forward, and at the moment when the first arc-shaped gear ring 13 and the gear 12 are separated, the second arc-shaped gear ring 14 meshes with the gear 12, thereby driving the gear 12 to rotate reversely;

[0073] During the process of the gear 12 driving the rotating rod 6 to rotate forward, the sleeve 3 drives the convex column 8 to slide to the top end of the straight groove 401 and then to the top end of the next straight groove 401 through the first arc-shaped groove 402 under the action of the steel ball 7 and the helical groove 601 as well as the convex column 8 and the straight groove 401;

[0074] During the process of the gear 12 driving the rotating rod 6 to rotate reversely, the sleeve 3 drives the convex column 8 to slide to the bottom end of the next straight groove 401.

[0075] In this embodiment, please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 and Figure 9, the one-way power of the pumping mechanism continuously inputs the circular cover 9, the circular cover 9 drives the rotation of the first arc-shaped gear ring 13; when the first arc-shaped gear ring 13 is engaged with the gear 12, the gear 12, the connecting shaft 11 and the rotating rod 6 rotate in the same direction, the helical groove 601 applies upward helical thrust to the sleeve 3 through the steel ball 7, meanwhile the convex column 8 is limited in the straight groove 401 and can only slide axially, so that the sleeve 3 linearly rises; the convex column 8 reaches the top end of the straight groove 401 and enters the first arc-shaped groove 402 connected thereto, the sleeve 3 continues to rotate with the rotating rod 6 and slides along the first arc-shaped groove 402 to the top end of the next straight groove 401, completing the first circumferential indexing;

[0076] The first arc-shaped gear ring 13 is disengaged from the gear 12, and the second arc-shaped gear ring 14 is immediately engaged with the gear 12, so that the gear 12 reverses; the rotating rod 6 reverses to make the helical groove 601 push the steel ball 7 downward, the convex column 8 linearly descends along the new straight groove 401 and enters the second arc-shaped groove 403 at the bottom end, at this time, the second arc-shaped gear ring 14 is disengaged from the gear 12, and the first arc-shaped gear ring 13 is engaged with the gear 12 again, so that the sleeve 3 rotates with the rotating rod 6 again, and the convex column 8 slides from the second arc-shaped groove 403 to the next straight groove 401, so that the sleeve 3 is secondly indexed in the same direction.

[0077] The circular cover 9 continuously rotates in one direction, the first arc-shaped gear ring 13 and the second arc-shaped gear ring 14 are alternately engaged with the gear 12, the rotating rod 6 is correspondingly rotated in opposite directions, the sleeve 3 is circularly moved under the constraint of the wave-shaped sliding groove of "rising-indexing-descending-reindexing", the probe 2 is synchronously raised and lowered with the sleeve 3 through the swing plate 5 and is fixedly indexed by the same angle each time; the pumping mechanism always operates in one direction and continuously provides air flow for the probe 2 in the whole process.

[0078] As a further scheme of the application, the pumping mechanism comprises a hollow pipe 15 and a ring seat 16, the top end of the hollow pipe 15 is fixedly connected with the top of the sleeve 3 in a same axis, and the ring seat 16 is coaxially sleeved on the bottom of the rotating rod 6 and is fixedly connected with the barrel seat 4;

[0079] The bottom of the hollow pipe 15 is fixedly sleeved with a sealing ring 17, and the outer wall of the sealing ring 17 is in close contact with the inner wall of the rotating rod 6;

[0080] The top end of the hollow pipe 15 is connected with the output end of the probe 2 through a first conduit 18, and the bottom side wall of the rotating rod 6 is provided with a plurality of through holes 602, and the plurality of through holes 602 guide the inside of the rotating rod 6 and the inside of the ring seat 16;

[0081] The frame 1 is fixedly provided with a pump 19, the output end of the pump 19 is fixedly connected with the circular cover 9 in a same axis, and the air inlet of the pump 19 is guided through a second conduit 20 and the side wall of the ring seat 16.

[0082] In this embodiment, please refer to Figure 4 , Figure 10 and Figure 11 , the pump 19 as the only power source to maintain a one-way continuous operation, its output shaft drives the round cover 9 rotation, providing a one-way torque for the drive mechanism; at the same time, the air inlet side of the pump 19 continuously sucks the air in the ring seat 16 through the No. 2 conduit 20, so that the inside of the ring seat 16 maintains a negative pressure;

[0083] The ring seat 16 is always communicated with the inner cavity of the rotating rod 6 through the through hole 602, forming a continuous air suction channel from the detector 2→No. 1 conduit 18→hollow tube 15→the inner cavity of the rotating rod 6→the through hole 602→the ring seat 16→No. 2 conduit 20→the pump 19;

[0084] The top end of the hollow tube 15 is fixedly connected with the top of the sleeve 3 and synchronously rises and falls with the sleeve 3, and the sealing ring 17 at the bottom end of the hollow tube 15 is always in sliding fit with the inner wall of the rotating rod 6, so as to ensure the sealing property of the air suction channel during the rising and falling process; therefore, no matter the sleeve 3 is in the rising, falling or rotating position, the gas collected by the detector 2 is continuously sucked to the pump 19 in the negative pressure path, so that the uninterrupted sampling is realized in the whole stroke.

[0085] A smoke particle detection method using the above-mentioned gas detector, comprising the following steps:

[0086] Step 1: start the pump and maintain a one-way continuous operation, the pump operates with a constant rotation direction, its output shaft synchronously drives the round cover rotation, providing a one-way torque for the drive mechanism, at the same time, the air inlet side of the pump continuously sucks the air in the ring seat through the No. 2 conduit, so that a stable negative pressure sampling channel is formed between the detector, No. 1 conduit, hollow tube, inner cavity of the rotating rod, through hole, ring seat, No. 2 conduit, and the negative pressure is uninterrupted in the whole detection process;

[0087] Step 2: the drive mechanism transmits the one-way rotation of the pump through the mutual cooperation between the rotating rod, helical groove, steel ball, protruding column, No. 1 arc-shaped slot, straight slot, No. 2 arc-shaped slot, round cover, disc, connecting shaft, gear, No. 1 arc-shaped gear ring and No. 2 arc-shaped gear ring, so that the sleeve realizes the cyclic motion of “straight-line rising→circumferential rotating→straight-line falling→circumferential rotating” under the constraint of the wave-shaped sliding groove;

[0088] Step 3: the detector synchronously moves with the sleeve and continuously sucks the smoke-containing gas, the swing plate transmits the compound motion of the sleeve to the detector, so that the detector experiences high-position sampling, horizontal rotating, low-position sampling and horizontal rotating again in each cycle, forming a spatial three-dimensional scanning, the hollow tube rises and falls with the sleeve, the sealing ring is always in sliding sealing with the inner wall of the rotating rod, so as to ensure that the effective length of the negative pressure channel changes with the sleeve but does not leak, and the sampling port of the detector continuously sucks the external smoke-containing gas in the whole motion range;

[0089] Step four: cycle completes multi-point particle concentration timing record, when the sleeve completes the preset cycle number, the detector has covered the full range of circumference at fixed angular intervals and collected gas at high and low double levels, a series of smoke particle concentration signals corresponding to positions are obtained, the above timing signals are sent to the rear processing unit, and a spatial smoke distribution map can be drawn, realizing the rapid, dead angle-free identification and positioning of early fire smoke in a large space.

[0090] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the above description, and it is therefore intended that all changes that come within the meaning and range of equivalency of the claims are embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0091] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment according to the present specification need necessarily include every technological feature or combination of technological features. Such description of one embodiment according to the present specification merely treats such an embodiment as an example, and does not impose unnecessary limitations to the scope of the present application, and the present application is defined solely by the claims below. It is therefore intended that all changes that come within the meaning and range of equivalency of the claims are embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

Claims

1. A gas detector comprising a housing (1), a detector (2) and a sleeve (3), characterized in that The rack (1) is fixedly provided with a barrel seat (4), the sleeve (3) and the barrel seat (4) are coaxially movably matched, the detector (2) is fixedly connected with the top of the sleeve (3) through a swing plate (5); The rack (1) and the barrel seat (4) are provided with a driving mechanism, and the driving mechanism is matched with the sleeve (3); When the driving mechanism operates, the sleeve (3) is driven to slide out along the length direction of the barrel seat (4) and extend to the upper stroke end, the sleeve (3) is oriented and rotated by a predetermined angle, then the sleeve (3) returns to the lower stroke end, the sleeve (3) is oriented and rotated by a predetermined angle again, so as to drive the detector (2) to be oriented and spaced deflected and alternately lifted and lowered; The detector (2) is communicated with a pumping mechanism, and the pumping mechanism is connected with the driving mechanism, so that the pumping mechanism continuously pumps air during the process that the detector (2) is oriented and spaced deflected and alternately lifted and lowered; The driving mechanism comprises a rotating rod (6) and a steel ball (7), the rotating rod (6) is coaxially rotationally arranged in the inside of the barrel seat (4), and the sleeve (3) is sleeved on the outside of the rotating rod (6); The steel ball (7) is rollingly embedded in the inner wall of the sleeve (3), the outer wall of the rotating rod (6) is provided with a spiral groove (601) along the length direction thereof, and the steel ball (7) is also rollingly embedded in the spiral groove (601); The outer wall of the sleeve (3) is fixedly provided with a convex column (8), and the inner wall of the barrel seat (4) is provided with a straight groove (401) along the length direction thereof; The straight groove (401) is provided with a plurality of straight grooves (401) and is uniformly distributed along the circumferential direction, and the convex column (8) is slidably embedded in one of the straight grooves (401); The inner wall of the barrel seat (4) is provided with a first arc-shaped groove (402) along the circumferential direction, and the first arc-shaped groove (402) is provided with a plurality of first arc-shaped grooves (402) and is uniformly distributed along the circumference; The inner wall of the barrel seat (4) is provided with a second arc-shaped groove (403) along the circumferential direction, and the second arc-shaped groove (403) is provided with a plurality of second arc-shaped grooves (403) and is uniformly distributed along the circumference, wherein the horizontal height of the second arc-shaped groove (403) is less than the horizontal height of the first arc-shaped groove (402); The plurality of first arc-shaped grooves (402) and the plurality of second arc-shaped grooves (403) are distributed in a staggered manner, and the two ends of the plurality of first arc-shaped grooves (402) are respectively communicated with the top ends of the adjacent two straight grooves (401); The two ends of the plurality of second arc-shaped grooves (403) are respectively communicated with the bottom ends of the adjacent two straight grooves (401); The driving mechanism further comprises a circular cover (9) and a circular disc (10), the circular cover (9) is rotationally arranged on the rack (1), and the circular disc (10) is coaxially fixedly arranged on the circular cover (9); The bottom of the rotating rod (6) is coaxially fixedly provided with a connecting shaft (11), the outer wall of the connecting shaft (11) is coaxially fixedly provided with a gear (12), and the outer wall of the gear (12) is respectively attached to the outer wall of the circular disc (10) and the inner wall of the circular cover (9).

2. A gas detector according to claim 1, characterised in that The inner circumferential surface of the circular cover (9) is coaxially fixed with a first arc-shaped gear ring (13), the outer wall of the disc (10) is coaxially fixed with a second arc-shaped gear ring (14), and the gear (12) is in mesh with the first arc-shaped gear ring (13); When the circular cover (9) rotates, the first arc-shaped gear ring (13) drives the gear (12) to rotate forward, at the moment when the first arc-shaped gear ring (13) is separated from the gear (12), the second arc-shaped gear ring (14) is in mesh with the gear (12), thereby driving the gear (12) to rotate reversely.

3. A gas detector according to claim 2, wherein The pump mechanism comprises a hollow pipe (15) and a ring seat (16), the top end of the hollow pipe (15) is coaxially fixedly connected with the top of the sleeve pipe (3), and the ring seat (16) is coaxially sleeved on the bottom of the rotating rod (6) and fixedly connected with the cylinder seat (4); The bottom of the hollow pipe (15) is coaxially fixedly sleeved with a sealing ring (17), and the outer wall of the sealing ring (17) is in close contact with the inner wall of the rotating rod (6).

4. A gas detector according to claim 3, wherein The top end of the hollow pipe (15) is connected with the output end of the detector (2) through a first conduit (18), and the bottom side wall of the rotating rod (6) is provided with a plurality of through holes (602), and the plurality of through holes (602) guide the inside of the rotating rod (6) and the inside of the ring seat (16). The frame (1) is fixedly provided with a pump (19), the output end of the pump (19) is coaxially fixedly connected with the circular cover (9), and the air inlet of the pump (19) is in communication with the side wall of the ring seat (16) through a second conduit (20).

5. A method of detecting smoke particles using a gas detector as claimed in claim 4, characterized in that The method comprises the following steps: Step one: start the pump and keep it running in one direction continuously, the pump rotates in a constant direction, the output shaft of the pump drives the circular cover to rotate, providing one-way torque for the driving mechanism, and the air inlet of the pump continuously sucks the ring seat through the second conduit, forming a stable negative pressure sampling channel between the detector, the first conduit, the hollow pipe, the inner cavity of the rotating rod, the through holes, the ring seat and the second conduit, and the negative pressure is uninterrupted during the entire detection process; Step two: the driving mechanism transmits the one-way rotation of the pump through the cooperation between the rotating rod, the spiral groove, the steel ball, the convex column, the first arc-shaped groove, the straight groove, the second arc-shaped groove, the circular cover, the disc, the connecting shaft, the gear, the first arc-shaped gear ring and the second arc-shaped gear ring, so that the sleeve realizes the circular motion of linear upward movement-circumferential rotation-linear downward movement-circumferential rotation under the constraint of the sliding groove; Step three: the detector moves synchronously with the sleeve and continuously sucks the smoke-containing gas, the swing plate transmits the compound motion of the sleeve to the detector, so that the detector experiences high-position sampling, horizontal rotation, low-position sampling and horizontal rotation again in each cycle, forming a spatial three-dimensional scanning, the hollow pipe rises and falls with the sleeve, the sealing ring is always in sliding sealing with the inner wall of the rotating rod, ensuring that the effective length of the negative pressure channel changes dynamically but does not leak, and the sampling port of the detector continuously inhales the gas containing smoke particles outside the entire motion range; Step four: cycle complete multi-point particle concentration timing record, when the sleeve completes the preset cycle number, the detector has covered the full range of the circumference at fixed angular intervals and collected gas at high and low double levels, obtaining a series of smoke particle concentration signals corresponding to positions one by one, and sending them to the back-end processing unit, which can draw a spatial smoke distribution map, achieving rapid, dead angle-free identification and positioning of early fire smoke in large spaces.

Images