VOC (volatile organic compound) detection device with quick water vapor removal function

Abstract

The invention discloses a VOC detection device with a rapid water vapor removal function, the detection device comprises a bottom frame, an air pump, a dust removal mechanism, a water absorption mechanism, a shunting mechanism and a detection mechanism, the dust removal mechanism comprises an outer conical cylinder, a tangential pipe and a dust falling box, the outer conical cylinder is provided with a top opening, a bottom opening and a tangential hole, the tangential pipe is fixedly connected with the air pump and the tangential hole, and the bottom opening is fixedly connected with the tangential hole. The air pump, the dust falling box, the water absorption mechanism and the detection mechanism are fixedly connected with the bottom frame, the bottom opening is fixedly connected with the dust falling box, the water absorption mechanism is fixedly connected with the top opening, the flow dividing mechanism is fixedly connected with the water absorption mechanism and the detection mechanism, and the detection mechanism is connected with the flow dividing mechanism through electric signals; the invention relates to the technical field of VOC detection devices, and the VOC detection device can remove particle dust and water vapor in VOC, improves the detection precision, can fully utilize the advantages of two detectors through switching modes, complement each other, improves the detection accuracy, reliability and application range, and can perform self-cleaning after detection to avoid interference on the next detection result.

Description

Technical Field

[0001] The invention relates to the technical field of VOC detection devices, and in particular to a VOC detection device with a water vapor rapid removal function. Background Art

[0002] The mainstream VOC detection devices on the market currently use photoionization detectors (PID) or flame ionization detectors (FID) for detection; PID detectors can detect VOCs from 1ppb to 4000ppm or 0.1ppm to 10000ppm. It is suitable for low-concentration VOC detection, but has no response to methane. FID detectors can measure VOCs from 1 to 50000ppm and have good linearity at high concentrations. The reaction is not very good at low concentrations, and it has the highest sensitivity to aromatic compounds and long-chain compounds, and is suitable for broad-spectrum detection.

[0003] A single detector has poor detection effect on VOC, and the excess water vapor and particulate dust in VOC will interfere with the detection results. The filter head needs to be replaced frequently to ensure the accuracy of the detection. High concentrations of VOC will cause some discomfort to the human body. It is necessary to avoid long-term exposure of testers to high-concentration VOC environments, which may cause damage to the health of testers. Long-term exposure of the detector to an inappropriate concentration environment for detection can easily cause the detector sensitivity to decrease. Summary of the invention

[0004] The object of the present invention is to provide a VOC detection device with a water vapor rapid removal function to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A VOC detection device with a function of rapid removal of water vapor includes a base frame, an air pump, a dust removal mechanism, a water absorption mechanism, a diversion mechanism and a detection mechanism. The dust removal mechanism includes an outer cone, a tangential tube and a dust collection box. The outer cone is provided with a top opening, a bottom opening and a tangential hole. The tangential tube is fixedly connected to the air pump and the tangential hole. The air pump, the dust collection box, the water absorption mechanism and the detection mechanism are fixedly connected to the base frame. The bottom opening is fixedly connected to the dust collection box. The water absorption mechanism is fixedly connected to the top opening. The diversion mechanism is fixedly connected to the water absorption mechanism and the detection mechanism. The detection mechanism is connected to the diversion mechanism through electrical signals.

[0006] The present invention discloses a device for detecting VOC in an environment. The gas in the environment is pumped into an outer cone through a tangential tube and a tangential hole by an air pump. The particulate dust in the gas is preliminarily separated by the outer cone. The particulate dust falls into a dust collecting box through a bottom opening and is discharged. The gas passes through a water absorption mechanism through a top opening. The water absorption mechanism condenses and removes water vapor in the gas to improve the detection accuracy. The gas is then passed through a diversion mechanism into a detection mechanism to detect VOC. The detection mechanism detects the concentration state of VOC. The diversion mechanism switches the state to improve the accuracy of the detection mechanism. After the detection is completed, the diversion mechanism exhausts the gas in the detection mechanism to avoid interfering with the next detection result.

[0007] Furthermore, the dust removal mechanism also includes an inner liner, an assembly frame, a bearing and an inner cone cylinder. The inner liner is rotatably connected to the outer cone cylinder, a first cone thread is provided on the inner liner, the assembly frame is fixedly connected to an end of the outer cone cylinder away from the top opening, the bearing is fixedly connected to the assembly frame and the inner cone cylinder, a second cone thread is provided on the inner cone cylinder, the first cone thread and the second cone thread have the same thread rotation direction, and the water suction mechanism includes an air inlet pipe, and the top opening is fixedly connected to the air inlet pipe.

[0008] The gas in the environment is pumped into the outer cone through the tangential pipe and the tangential hole through the air pump, and the gas enters tangentially along the outer cone. As the first cone thread of the liner rotates, the particulate dust in the gas spirals downward along the first cone thread under the action of tangential force and gravity, and the particulate dust is thrown to the inner wall of the liner and falls downward through the bottom opening into the dust collection box for deposition and discharge. VOC usually exists in gaseous form, with small molecules and light mass, and is difficult to be effectively separated by centrifugal force. After reaching the bottom of the outer cone, the outer vortex airflow will turn and pass through the inner cone to rotate upward along the axis to form an inner vortex. The rotation direction of the inner vortex is the same as that of the outer vortex, but in the opposite direction, that is, it moves upward from the bottom of the outer cone through the top opening into the air inlet pipe. The outer vortex airflow accelerates along the first cone thread when it goes downward, and accelerates along the second cone thread when the inner vortex goes upward. The increase in the speed difference between the outer vortex airflow and the inner vortex further improves the efficiency of particulate dust separation.

[0009] Furthermore, the water absorption mechanism also includes a humidity sensor, a condensation mechanism and a wind-blocking mechanism. The humidity sensor is fixedly connected to the air inlet pipe. The condensation mechanism includes an outer shell, which is fixedly connected to the base frame. The outer shell is provided with a main air hole, a square opening and a first semicircular hole. The main air hole is fixedly connected to the air inlet pipe. The wind-blocking mechanism includes a back box, and the square opening is fixedly connected to the back box. The diversion mechanism includes a first connecting tube, which is provided with a second semicircular hole, and the first semicircular hole is fixedly connected to the second semicircular hole.

[0010] VOC passes through the humidity sensor and the main air hole into the outer shell to complete condensation. The wind blocking mechanism located in the square mouth adjusts the gas condensation time according to the water vapor content of VOC. When the water content of VOC is high, the condensation time is increased. The VOC that has completed condensation and removed water vapor passes into the diversion mechanism through the first semicircular hole and the second semicircular hole.

[0011] Furthermore, the condensation mechanism also includes a partition, a valve tube, a condensation tube array, a filter, a liquid collecting drawer and a back plate. The partition, the outer shell and the filter form a condensation chamber. The outer shell is also provided with a first through hole and a second through hole. The partition is provided with a first tube hole and a second tube hole. The first through hole and the first tube hole are fixedly connected to the condensation tube array, the second through hole and the second tube hole are fixedly connected to the valve tube, the liquid collecting drawer is slidably connected to the outer shell and the filter, the back plate is fixedly connected to the outer shell, and an air outlet is provided on the back plate, and the air outlet is arranged at the bottom of the back plate.

[0012] VOC passes through the main air hole into the condensation chamber composed of a partition, an outer shell, and a filter. The main air hole is located at the top of the condensation chamber. An external cold source passes circulating refrigerant into the condensation tubes, and pressurizes the condensation chamber through a valve pipe, so that the temperature and pressure in the condensation chamber reach the standard of condensation and water absorption. VOC sinks in the condensation chamber, and the water vapor condenses into droplets and falls into the liquid collection drawer through the filter. The dry and low-temperature VOC with water vapor removed passes through the air outlet on the back plate to the outside of the condensation chamber. After the VOC is initially heated up, it passes into the diversion mechanism through the first semicircular hole and the second semicircular hole.

[0013] Furthermore, the wind-blocking mechanism also includes a first motor, a first gear, a gear rod, a pulley rod, and an arc plate. The first motor is fixedly connected to the back box, the output end of the first motor is fixedly connected to the first gear, the first gear is meshed with the tooth surface of the gear rod, the pulley rod and the arc plate are each provided with several groups, the gear rod and the pulley rod are connected by belt drive, the pulley rod is fixedly connected to the arc plate, the pulley rod is rotatably connected to the back box, and the first motor is connected to the humidity sensor via an electrical signal.

[0014] When the humidity of VOC is high, it is necessary to extend the residence time of VOC in the condensation chamber to ensure that its water vapor is fully removed. The first motor outputs torque to the first gear, and the torque is transmitted through the meshing of the tooth surface of the first gear and the gear rod. The gear rod is linked to several groups of pulley rods through belts. The pulley rod drives the arc plate to rotate, so that the concave surface of the arc plate faces upward, and the falling gas falls on the concave surface of the arc plate to form a turbulence. As the inclination of the concave surface of the arc plate increases, the intensity of the gas turbulence becomes greater, and the falling time of the gas is extended.

[0015] Furthermore, the diversion mechanism also includes a second motor, a second gear, a second connecting cylinder and a valve core mechanism. The first connecting cylinder is also provided with a side groove. The first connecting cylinder is fixedly connected to the second motor and the second connecting cylinder. The output end of the second motor is meshed with the tooth surface of the second gear. The second gear is slidably connected to the side groove. The valve core mechanism includes an inner cylinder. The inner cylinder is provided with an annular tooth groove. The second gear is meshed with the tooth surface of the annular tooth groove. The inner cylinder is rotationally connected to the first connecting cylinder and the second connecting cylinder. The detection mechanism includes a cabin, a photoionization detector and a flame ionization detector. The second connecting cylinder is fixedly connected to the cabin. The photoionization detector and the flame ionization detector are both connected to the second motor through electrical signals.

[0016] The clean VOC that has been dehydrated and dusted is passed into the cabin through the second semicircular hole and the inner cylinder. The photoionization detector and the flame ionization detector detect VOC at the same time. According to the concentration state of the detected VOC, the photoionization detector and the flame ionization detector determine whether the VOC is in a high concentration or a low concentration, and send an electrical signal to the second motor. The second motor outputs torque to the second gear, and the torque is transmitted through the tooth surface meshing between the second gear and the annular tooth groove. The inner cylinder rotates, and the detection mode is switched to allow the photoionization detector and the flame ionization detector to detect separately, so as to avoid damage to the other group of detectors due to long-term detection of VOCs beyond the detection range. The photoionization detector is suitable for low-concentration VOC detection, and the flame ionization detector is suitable for high-concentration VOC detection.

[0017] Furthermore, the valve core mechanism also includes a ring frame, a third motor and a fan wheel, the ring frame is fixedly connected to the inner tube and the third motor, the output end of the third motor is fixedly connected to the fan wheel, the second connecting tube is provided with an air leakage hole, the inner tube is also provided with a third semicircular hole, an air outlet hole, a first air hole, a second air hole and a third air hole, and the cabin is provided with a first air inlet hole and a second air inlet hole;

[0018] Initial detection mode: the third semicircular hole contacts the second semicircular hole, the first air hole contacts the first air inlet hole, and the second air hole contacts the second air inlet hole;

[0019] Low concentration detection mode: the third air hole is in contact with the first air inlet hole;

[0020] Broad spectrum detection mode: the third air hole is in contact with the second air inlet hole;

[0021] Self-cleaning mode: the air outlet and the air leakage hole are in contact.

[0022] In the initial detection mode, dry VOC passes into the inner cylinder through the third semicircular hole and the second semicircular hole, and then is diverted through the first air hole and the second air hole, and enters the cabin through the first air inlet and the second air inlet respectively, and is detected by the photoionization detector and the flame ionization detector at the same time; in the low-concentration detection mode, the VOC is detected to be of low concentration, and the photoionization detector is adapted. The second motor outputs torque, and the inner cylinder rotates 90 degrees to the side close to the first air inlet. The dry VOC passes into the cabin through the third semicircular hole, the second semicircular hole, the third air hole, and the first air inlet, and is detected by the photoionization detector. At this time, the first air hole and the second air hole are blocked by the cabin and are not connected; in the broad-spectrum detection mode, the VOC is detected to be of high concentration, and the flame ionization detector is adapted. The second motor outputs reverse torque, the inner cylinder rotates ninety degrees toward the second air inlet, and the dry VOC passes into the cabin through the third semicircular hole, the second semicircular hole, the third air hole, and the second air inlet, and is detected by the flame ionization detector. The first air hole and the second air hole are blocked by the cabin and are not connected; in self-cleaning mode, after completing the VOC detection, the second motor outputs torque, the inner cylinder rotates one hundred and eighty degrees, the third semicircular hole is not in contact with the second semicircular hole, the air outlet is in contact with the air leakage hole, the first air hole is in contact with the first air inlet, and the second air hole is in contact with the second air inlet. The third motor drives the fan wheel to rotate, and the VOC remaining in the cabin is extracted and discharged through the first air hole, the first air inlet, the second air hole, the second air inlet, the air outlet, and the air leakage hole.

[0023] Furthermore, the detection mechanism also includes a vertical plate, the vertical plate, the photoionization detector, and the flame ionization detector are all fixedly connected to the cabin, the vertical plate and the side of the cabin close to the first air inlet form a first detection chamber, and the vertical plate and the side of the cabin close to the second air inlet form a second detection chamber.

[0024] In the low-concentration detection mode, dry VOCs pass through the third air hole and the first air inlet into the first detection chamber composed of the vertical plate and the side of the cabin body close to the first air inlet, and are detected by the photoionization detector. In the broad-spectrum detection mode, dry VOCs pass through the third air hole and the second air inlet into the second detection chamber, and are detected by the flame ionization detector.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention designs a dust removal mechanism, and through the optimization of the cyclone dust collector, VOC is usually in the form of gas and is difficult to be effectively separated by centrifugal force. When the outer vortex airflow is downward, it accelerates along the first conical thread, and when the inner vortex is upward, it accelerates along the second conical thread. The increase in the speed difference between the outer vortex airflow and the inner vortex further improves the efficiency of particle dust separation, and effectively separates the particle dust in the VOC; the present invention designs a water absorption mechanism, and through the circulation of refrigerant into the condensation tube array, pressurizes the condensation chamber through the valve pipe to complete the water vapor removal. When the humidity of the VOC is high, the condensation time needs to be extended to fully remove the water vapor. The output torque of the first motor drives the arc plate to rotate, and the falling gas falls on the concave surface of the arc plate to form a turbulent flow. The falling time of the gas is extended, and the water vapor in the VOC can be fully removed, avoiding the interference of humidity on the detector; the present invention designs a diversion mechanism and a detection mechanism, and through the cooperation of the two, four modes are provided for VOC detection. In the initial detection mode, the photoionization detector and the flame ionization detector simultaneously detect the VOC concentration for preliminary judgment. In the low concentration detection mode, the dry VOC is passed into the first detection chamber and detected by the photoionization detector. In the broad spectrum detection mode, the dry VOC is passed into the second detection chamber and detected by the flame ionization detector. In the self-cleaning mode, the third motor drives the fan wheel to rotate, and the VOC remaining in the cabin is extracted out of the air outlet and the air vent. The detection mode is switched according to the VOC concentration to make the photoionization detector and the flame ionization detector detect separately to avoid damage caused by the other group of detectors due to long-term detection of VOCs beyond the detection range. After the detection is completed, the gas in the cabin is exhausted to avoid interference with the next detection result. The present invention can remove particulate dust and water vapor in VOC and improve the detection accuracy. By switching modes, the advantages of the two detectors can be fully utilized to learn from each other's strengths and weaknesses, improve the accuracy, reliability and scope of application of the detection, and self-clean after the detection is completed to avoid interference with the next detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the dust removal mechanism structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the water absorption mechanism of the present invention;

[0029] Figure 4 It is a partial cross-sectional view of the condensing mechanism of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the wind blocking mechanism of the present invention;

[0031] Figure 6 It is a schematic diagram of the diversion mechanism structure of the present invention;

[0032] Figure 7 It is a schematic diagram of the valve core mechanism structure of the present invention;

[0033] Figure 8 It is a schematic diagram of the structure of the detection mechanism of the present invention.

[0034] In the figure: 1, base frame; 2, air pump; 3, dust removal mechanism; 31, outer cone; 311, top opening; 312, bottom opening; 313, tangential hole; 32, tangential pipe; 33, lining; 331, first cone thread; 34, assembly frame; 35, bearing; 36, inner cone; 361, second cone thread; 37, dust box; 4, water absorption mechanism; 41, air inlet pipe; 42, humidity sensor; 43, condensation mechanism; 431 , housing; 4311, first through hole; 4312, second through hole; 4313, main air hole; 4314, square mouth; 4315, first semicircular hole; 432, partition; 4321, first tube hole; 4322, second tube hole; 433, condensation chamber; 434, valve pipe; 435, condensation tube; 436, filter; 437, liquid collection drawer; 438, back plate; 4381, air outlet; 44, wind blocking mechanism; 4 41. back box; 442. first motor; 443. first gear; 444. gear rod; 445. pulley rod; 446. arc plate; 5. diversion mechanism; 51. second motor; 52. second gear; 53. first connecting tube; 531. second semicircular hole; 532. side groove; 54. second connecting tube; 541. air leakage hole; 55. valve core mechanism; 551. inner tube; 5511. ring tooth groove; 5512. third semicircular hole Hole; 5513, air outlet; 5514, first air hole; 5515, second air hole; 5516, third air hole; 552, ring frame; 553, third motor; 554, fan wheel; 6, detection mechanism; 61, cabin; 611, first air inlet; 612, second air inlet; 62, vertical plate; 63, first detection chamber; 64, second detection chamber; 65, photoionization detector; 66, flame ionization detector. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 , Figure 2As shown, the present invention provides a technical solution of a VOC detection device with a function of rapid removal of water vapor, including a base frame 1, an air pump 2, a dust removal mechanism 3, a water absorption mechanism 4, a diversion mechanism 5 and a detection mechanism 6. The dust removal mechanism 3 includes an outer cone 31, a tangential tube 32 and a dust box 37. The outer cone 31 is provided with a top opening 311, a bottom opening 312 and a tangential hole 313. The tangential tube 32 is fixedly connected to the air pump 2 and the tangential hole 313. The air pump 2, the dust box 37, the water absorption mechanism 4 and the detection mechanism 6 are fixedly connected to the base frame 1. The bottom opening 312 is fixedly connected to the dust box 37. The water absorption mechanism 4 is fixedly connected to the top opening 311. The diversion mechanism 5 is fixedly connected to the water absorption mechanism 4 and the detection mechanism 6. The detection mechanism 6 is connected to the diversion mechanism 5 through an electrical signal.

[0037] The present invention is a device for detecting VOC in an environment. The gas in the environment is pumped into an outer cone 31 through a tangential tube 32 and a tangential hole 313 by an air pump 2. The particulate dust in the gas is preliminarily separated by the outer cone 31. The particulate dust falls into a dust box 37 through a bottom opening 312 and is discharged. The gas passes through a water absorption mechanism 4 through a top opening 311. The water absorption mechanism 4 condenses and removes water vapor in the gas to improve the detection accuracy. The gas is then passed through a diversion mechanism 5 into a detection mechanism 6 to detect VOC. The detection mechanism 6 detects the concentration state of VOC. The diversion mechanism 5 switches the state to improve the accuracy of the detection mechanism 6. After the detection is completed, the diversion mechanism 5 exhausts the gas in the detection mechanism 6 to avoid interfering with the next detection result.

[0038] like Figure 2 , Figure 3 As shown, the dust removal mechanism 3 also includes an inner lining 33, an assembly frame 34, a bearing 35 and an inner cone cylinder 36. The inner lining 33 is rotatably connected to the outer cone cylinder 31. The inner lining 33 is provided with a first conical thread 331. The assembly frame 34 is fixedly connected to the end of the outer cone cylinder 31 away from the top opening 311. The bearing 35 is fixedly connected to the assembly frame 34 and the inner cone cylinder 36. The inner cone cylinder 36 is provided with a second conical thread 361. The first conical thread 331 and the second conical thread 361 have the same thread rotation direction. The water absorption mechanism 4 includes an air inlet pipe 41, and the top opening 311 is fixedly connected to the air inlet pipe 41.

[0039] The gas in the environment is pumped into the outer cone cylinder 31 through the tangential pipe 32 and the tangential hole 313 by the air pump 2. The gas enters the outer cone cylinder 31 tangentially. As the first cone thread 331 of the liner 33 rotates, the particle dust in the gas spirals downward along the first cone thread 331 under the action of the tangential force and gravity. The particle dust is thrown to the inner wall of the liner 33 and falls downward through the bottom opening 312 into the dust box 37 for deposition and discharge. VOC usually exists in the form of gas, and its molecules are small and light, so it is difficult to be separated. The centrifugal force is effectively separated. After reaching the bottom of the outer cone 31, the outer vortex airflow will turn and pass through the inner cone 36 to rotate upward along the axis to form an inner vortex. The rotation direction of the inner vortex is the same as that of the outer vortex, but in the opposite direction, that is, it moves upward from the bottom of the outer cone 31 and enters the air inlet pipe 41 through the top port 311. When the outer vortex airflow moves downward, it accelerates along the first cone thread 331, and when the inner vortex moves upward, it accelerates along the second cone thread 361. The speed difference between the outer vortex airflow and the inner vortex increases, further improving the efficiency of particle dust separation.

[0040] like Figure 3 , Figure 4 , Figure 5 As shown, the water absorption mechanism 4 also includes a humidity sensor 42, a condensation mechanism 43 and a wind blocking mechanism 44. The humidity sensor 42 is fixedly connected to the air inlet pipe 41. The condensation mechanism 43 includes an outer shell 431, which is fixedly connected to the base frame 1. The outer shell 431 is provided with a main air hole 4313, a square opening 4314 and a first semicircular hole 4315. The main air hole 4313 is fixedly connected to the air inlet pipe 41. The wind blocking mechanism 44 includes a back box 441, and the square opening 4314 is fixedly connected to the back box 441. The diversion mechanism 5 includes a first connecting tube 53, which is provided with a second semicircular hole 531, and the first semicircular hole 4315 is fixedly connected to the second semicircular hole 531.

[0041] VOC passes through the humidity sensor 42 and the main air hole 4313 into the outer shell 431 to complete condensation. The wind blocking mechanism 44 located in the square opening 4314 adjusts the gas condensation time according to the water vapor content of the VOC. When the water content of the VOC is high, the condensation time is increased. The VOC that has completed condensation and removed water vapor passes into the diversion mechanism 5 through the first semicircular hole 4315 and the second semicircular hole 531.

[0042] like Figure 3 , Figure 4 , Figure 5As shown, the condensation mechanism 43 also includes a partition 432, a valve tube 434, a condensation array tube 435, a filter 436, a liquid collection drawer 437 and a back plate 438. The partition 432, the outer shell 431 and the filter 436 form a condensation chamber 433. The outer shell 431 is also provided with a first through hole 4311 and a second through hole 4312. The partition 432 is provided with a first tube hole 4321 and a second tube hole 4322. The first through hole 4311 and the first tube hole 4321 are both fixedly connected to the condensation array tube 435, the second through hole 4312 and the second tube hole 4322 are both fixedly connected to the valve tube 434, the liquid collection drawer 437 is slidably connected to the outer shell 431 and the filter 436, the back plate 438 is fixedly connected to the outer shell 431, and the back plate 438 is provided with an air outlet 4381, which is arranged at the bottom of the back plate 438.

[0043] VOC passes through the main air hole 4313 into the condensation chamber 433 composed of the partition 432, the shell 431 and the filter 436. The main air hole 4313 is located at the top of the condensation chamber 433. The external cold source passes the circulating refrigerant into the condensation array tube 435, and pressurizes the condensation chamber 433 through the valve tube 434, so that the temperature and pressure in the condensation chamber 433 reach the standard of condensation and water absorption. VOC sinks in the condensation chamber 433, and the water vapor condenses into droplets and falls into the liquid collection drawer 437 through the filter 436. The dry and low-temperature VOC with water vapor removed is discharged to the outside of the condensation chamber 433 through the air outlet 4381 on the back plate 438. After the VOC is initially heated up, it passes into the diversion mechanism 5 through the first semicircular hole 4315 and the second semicircular hole 531.

[0044] like Figure 3 , Figure 4 , Figure 5 As shown, the wind blocking mechanism 44 also includes a first motor 442, a first gear 443, a gear rod 444, a pulley rod 445, and an arc plate 446. The first motor 442 is fixedly connected to the back box 441, the output end of the first motor 442 is fixedly connected to the first gear 443, the first gear 443 is meshed with the tooth surface of the gear rod 444, the pulley rod 445 and the arc plate 446 are each provided with a plurality of groups, the gear rod 444 is connected to the pulley rod 445 through a belt drive, the pulley rod 445 is fixedly connected to the arc plate 446, the pulley rod 445 is rotationally connected to the back box 441, and the first motor 442 is connected to the humidity sensor 42 through an electrical signal.

[0045] When the humidity of VOC is high, it is necessary to extend the residence time of VOC in the condensation chamber 433 to ensure that the water vapor is fully removed. The first motor 442 outputs torque to the first gear 443, and the torque is transmitted through the meshing of the tooth surface of the first gear 443 and the gear rod 444. The gear rod 444 is linked to a plurality of groups of pulley rods 445 through a belt. The pulley rod 445 drives the arc plate 446 to rotate, so that the concave surface of the arc plate 446 faces upward, and the falling gas falls on the concave surface of the arc plate 446 to form a turbulence. As the inclination of the concave surface of the arc plate 446 increases, the intensity of the gas turbulence becomes greater, and the falling time of the gas is extended.

[0046] like Figure 6 , Figure 7 , Figure 8 As shown, the diversion mechanism 5 also includes a second motor 51, a second gear 52, a second connecting tube 54 and a valve core mechanism 55. The first connecting tube 53 is also provided with a side groove 532. The first connecting tube 53 is fixedly connected to the second motor 51 and the second connecting tube 54. The output end of the second motor 51 is meshed with the tooth surface of the second gear 52. The second gear 52 is slidably connected to the side groove 532. The valve core mechanism 55 includes an inner tube 551. The inner tube 551 is provided with an annular tooth groove 5511. The second gear 52 is meshed with the tooth surface of the annular tooth groove 5511. The inner tube 551 is rotatably connected to the first connecting tube 53 and the second connecting tube 54. The detection mechanism 6 includes a cabin 61, a photoionization detector 65 and a flame ionization detector 66. The second connecting tube 54 is fixedly connected to the cabin 61. The photoionization detector 65 and the flame ionization detector 66 are connected to the second motor 51 through electrical signals.

[0047] The clean VOC that has been dehydrated and dusted is passed into the cabin 61 through the second semicircular hole 531 and the inner cylinder 551. The photoionization detector 65 and the flame ionization detector 66 detect the VOC at the same time. According to the concentration state of the detected VOC, the photoionization detector 65 and the flame ionization detector 66 determine whether the VOC is in a high concentration or a low concentration, and send an electrical signal to the second motor 51. The second motor 51 outputs a torque to the second gear 52, and the torque is transmitted through the tooth surface meshing between the second gear 52 and the annular tooth groove 5511. The inner cylinder 551 rotates, and the detection mode is switched to make the photoionization detector 65 and the flame ionization detector 66 detect separately, so as to avoid damage to the other group of detectors due to long-term detection of VOCs beyond the detection range. The photoionization detector 65 is suitable for low-concentration VOC detection, and the flame ionization detector 66 is suitable for high-concentration VOC detection.

[0048] like Figure 6 , Figure 7 , Figure 8As shown, the valve core mechanism 55 also includes a ring frame 552, a third motor 553 and a fan wheel 554. The ring frame 552 is fixedly connected to the inner tube 551 and the third motor 553. The output end of the third motor 553 is fixedly connected to the fan wheel 554. The second connecting tube 54 is provided with an air leakage hole 541. The inner tube 551 is also provided with a third semicircular hole 5512, an air outlet hole 5513, a first air hole 5514, a second air hole 5515 and a third air hole 5516. The cabin 61 is provided with a first air inlet hole 611 and a second air inlet hole 612.

[0049] Initial detection mode: the third semicircular hole 5512 contacts the second semicircular hole 531 , the first air hole 5514 contacts the first air inlet hole 611 , and the second air hole 5515 contacts the second air inlet hole 612 ;

[0050] Low concentration detection mode: the third air hole 5516 is in contact with the first air inlet hole 611;

[0051] Broad spectrum detection mode: the third air hole 5516 is in contact with the second air inlet 612;

[0052] Self-cleaning mode: the air outlet hole 5513 is in contact with the air leakage hole 541 .

[0053] In the initial detection mode, the dry VOC passes into the inner cylinder 551 through the third semicircular hole 5512 and the second semicircular hole 531, and then is divided through the first air hole 5514 and the second air hole 5515, and enters the cabin 61 through the first air inlet hole 611 and the second air inlet hole 612 respectively, and is detected by the photoionization detector 65 and the flame ionization detector 66 at the same time; in the low concentration detection mode, it is detected that the VOC is of low concentration, the photoionization detector 65 is adapted, the second motor 51 outputs torque, and the inner cylinder 551 is The cylinder 551 rotates 90 degrees toward the first air inlet 611, and the dry VOC passes through the third semicircular hole 5512, the second semicircular hole 531, the third air hole 5516, and the first air inlet 611 into the cabin 61 to be detected by the photoionization detector 65. At this time, the first air hole 5514 and the second air hole 5515 are blocked by the cabin 61 and are not connected; in the broad spectrum detection mode, when the VOC is detected to be at a high concentration, the flame ionization detector 66 is adapted, and the second motor 51 outputs a reverse torque , the inner cylinder 551 rotates 90 degrees toward the second air inlet 612, and the dried VOC passes through the third semicircular hole 5512, the second semicircular hole 531, the third air hole 5516, and the second air inlet 612 into the cabin 61 for detection by the flame ionization detector 66, and the first air hole 5514 and the second air hole 5515 are blocked by the cabin 61 and are not connected; in the self-cleaning mode, after the VOC detection is completed, the second motor 51 outputs torque, the inner cylinder 551 rotates 180 degrees, and the third semicircular hole 5512, the second semicircular hole 531, the third air hole 5516, and the second air inlet 612 are passed into the cabin 61 for detection by the flame ionization detector 66, and the first air hole 5514 and the second air hole 5515 are blocked by the cabin 61 and are not connected; in the self-cleaning mode, after the VOC detection is completed, the second motor 51 outputs torque, the inner cylinder 551 rotates 180 degrees, and the third semicircular hole 531, the third air hole 5516, and the second air inlet 612 are passed into the cabin 61 and are detected by the flame ionization detector 66. Hole 5512 is not in contact with the second semicircular hole 531, the air outlet hole 5513 is in contact with the air leakage hole 541, the first air hole 5514 is in contact with the first air inlet hole 611, the second air hole 5515 is in contact with the second air inlet hole 612, and the third motor 553 drives the impeller 554 to rotate, and the VOC remaining in the cabin 61 is extracted and discharged through the first air hole 5514, the first air inlet hole 611, the second air hole 5515, the second air inlet hole 612, the air outlet hole 5513, and the air leakage hole 541.

[0054] like Figure 8 As shown, the detection mechanism 6 also includes a vertical plate 62. The vertical plate 62, the photoionization detector 65, and the flame ionization detector 66 are all fixedly connected to the cabin body 61. The vertical plate 62 and the cabin body 61 on the side close to the first air inlet hole 611 form a first detection chamber 63. The vertical plate 62 and the cabin body 61 on the side close to the second air inlet hole 612 form a second detection chamber 64.

[0055] In the low-concentration detection mode, dry VOCs pass through the third air hole 5516 and the first air inlet 611 into the first detection chamber 63 formed by the vertical plate 62 and the side of the cabin 61 close to the first air inlet 611, and are detected by the photoionization detector 65. In the broad-spectrum detection mode, dry VOCs pass through the third air hole 5516 and the second air inlet 612 into the second detection chamber 64, and are detected by the flame ionization detector 66.

[0056] Working principle of the present invention: The present invention is a device for detecting VOC in the environment. The gas in the environment is pumped into the outer cone 31 through the air pump 2 to separate the particulate dust in the gas and then pass it into the top of the condensation chamber 433. The circulating refrigerant is passed into the condensation array 435, and the condensation chamber 433 is pressurized through the valve pipe 434. The VOC with water vapor removed is passed out through the air outlet 4381. When the humidity of the VOC is high, the condensation time needs to be extended to fully remove the water vapor. The first motor 442 outputs torque The arc plate 446 is driven to rotate, and the falling gas falls on the concave surface of the arc plate 446 to form a turbulent flow. The falling time of the gas is prolonged, and the VOCs with water and dust removal are passed into the cabin 61. According to the concentration state of the VOC, the detection mode is switched to the detector for single detection to avoid the damage caused by the long-term detection of VOCs beyond the detection range by another group of detectors. In the initial detection mode, the dry VOC is passed into the inner cylinder 551 through the third semicircular hole 5512 and the second semicircular hole 531, and then through the first air hole 5514 and the second air hole 5515. The VOC is diverted and enters the cabin 61 to be detected by the photoionization detector 65 and the flame ionization detector 66 at the same time; in the low-concentration detection mode, the VOC is detected to be of low concentration, the photoionization detector 65 is adapted, the second motor 51 outputs torque, the inner cylinder 551 rotates 90 degrees to the side close to the first air inlet 611, and the dry VOC is passed into the first detection chamber 63 for detection. The first air hole 5514 and the second air hole 5515 are blocked by the cabin 61 and are not connected; in the broad-spectrum detection mode, the VOC is detected to be of high concentration. Adapting the flame ionization detector 66, the second motor 51 outputs a reverse torque, the inner cylinder 551 rotates in the opposite direction by ninety degrees, and the dry VOC is passed into the second detection chamber 64 for detection; in the self-cleaning mode, after completing the VOC detection, the second motor 51 outputs a torque, the inner cylinder 551 rotates one hundred and eighty degrees, the third semicircular hole 5512 is not in contact with the second semicircular hole 531, and the third motor 553 drives the impeller 554 to rotate, and the VOC remaining in the cabin 61 is extracted and discharged through the air outlet 5513 and the air leakage hole 541.

[0057] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A VOC detection device with a rapid water vapor removal function, characterized in that: The detection device comprises a base frame (1), an air pump (2), a dust removal mechanism (3), a water absorption mechanism (4), a flow diversion mechanism (5) and a detection mechanism (6); the dust removal mechanism (3) comprises an outer cone (31), a tangential tube (32) and a dust collection box (37); the outer cone (31) is provided with a top opening (311), a bottom opening (312) and a tangential hole (313); the tangential tube (32) is fixedly connected to the air pump (2) and the tangential hole (313); the air pump (2), the dust collection box (37), the water absorption mechanism (4) and the detection mechanism (6) are fixedly connected to the base frame (1); the bottom opening (312) is fixedly connected to the dust collection box (37); the water absorption mechanism (4) is fixedly connected to the top opening (311); the flow diversion mechanism (5) is fixedly connected to the water absorption mechanism (4) and the detection mechanism (6); and the detection mechanism (6) is connected to the flow diversion mechanism (5) via an electrical signal.

2. A VOC detection device with a rapid water vapor removal function according to claim 1, characterized in that: The dust removal mechanism (3) further comprises an inner liner (33), an assembly frame (34), a bearing (35) and an inner cone cylinder (36); the inner liner (33) is rotatably connected to the outer cone cylinder (31); a first cone thread (331) is provided on the inner liner (33); the assembly frame (34) is fixedly connected to an end of the outer cone cylinder (31) away from the top opening (311); the bearing (35) is fixedly connected to the assembly frame (34) and the inner cone cylinder (36); a second cone thread (361) is provided on the inner cone cylinder (36); the first cone thread (331) and the second cone thread (361) have the same thread rotation direction; the water absorption mechanism (4) comprises an air inlet pipe (41); and the top opening (311) is fixedly connected to the air inlet pipe (41).

3. A VOC detection device with a rapid water vapor removal function according to claim 2, characterized in that: The water absorption mechanism (4) further comprises a humidity sensor (42), a condensation mechanism (43) and a wind blocking mechanism (44); the humidity sensor (42) is fixedly connected to the air intake pipe (41); the condensation mechanism (43) comprises a housing (431); the housing (431) is fixedly connected to the base frame (1); the housing (431) is provided with a main air hole (4313), a square opening (4314) and a first semicircular hole (4315); the main air hole (4313) is fixedly connected to the air intake pipe (41); the wind blocking mechanism (44) comprises a back box (441); the square opening (4314) is fixedly connected to the back box (441); the flow diversion mechanism (5) comprises a first connecting tube (53); the first connecting tube (53) is provided with a second semicircular hole (531); the first semicircular hole (4315) is fixedly connected to the second semicircular hole (531).

4. A VOC detection device with a water vapor rapid removal function according to claim 3, characterized in that: The condensation mechanism (43) further comprises a partition (432), a valve tube (434), a condensation array tube (435), a filter screen (436), a liquid collection drawer (437) and a back plate (438); the partition (432), the housing (431) and the filter screen (436) form a condensation chamber (433); the housing (431) is further provided with a first through hole (4311) and a second through hole (4312); the partition (432) is provided with a first tube hole (4321) and a second tube hole (4322); A through hole (4311) and a first tube hole (4321) are both fixedly connected to the condensation tube array (435); the second through hole (4312) and the second tube hole (4322) are both fixedly connected to the valve tube (434); the liquid collecting drawer (437) is slidably connected to the outer shell (431) and the filter screen (436); the back plate (438) is fixedly connected to the outer shell (431); an air outlet hole (4381) is provided on the back plate (438); and the air outlet hole (4381) is provided at the bottom of the back plate (438).

5. The VOC detection device with rapid water vapor removal function according to claim 3 is characterized in that: The wind blocking mechanism (44) further comprises a first motor (442), a first gear (443), a gear rod (444), a pulley rod (445), and an arc plate (446); the first motor (442) is fixedly connected to the back box (441); the output end of the first motor (442) is fixedly connected to the first gear (443); the first gear (443) and the gear rod (444) are meshed with each other; the pulley rod (445) and the arc plate (446) are each provided with a plurality of groups; the gear rod (444) and the pulley rod (445) are connected via a belt transmission; the pulley rod (445) and the arc plate (446) are fixedly connected; the pulley rod (445) is rotationally connected to the back box (441); and the first motor (442) is connected to the humidity sensor (42) via an electrical signal.

6. A VOC detection device with a rapid water vapor removal function according to claim 3, characterized in that: The flow dividing mechanism (5) further comprises a second motor (51), a second gear (52), a second connecting tube (54) and a valve core mechanism (55); the first connecting tube (53) is further provided with a side groove (532); the first connecting tube (53) is fixedly connected to the second motor (51) and the second connecting tube (54); the output end of the second motor (51) is meshed with the tooth surface of the second gear (52); the second gear (52) is slidably connected to the side groove (532); the valve core mechanism (55) comprises an inner tube (551); the inner tube (55 1) is provided with an annular tooth groove (5511), the second gear (52) is meshed with the tooth surface of the annular tooth groove (5511), the inner cylinder (551) is rotatably connected to the first connecting cylinder (53) and the second connecting cylinder (54), the detection mechanism (6) comprises a cabin (61), a photoionization detector (65) and a flame ionization detector (66), the second connecting cylinder (54) is fixedly connected to the cabin (61), and the photoionization detector (65) and the flame ionization detector (66) are connected to the second motor (51) through electrical signals.

7. A VOC detection device with a rapid water vapor removal function according to claim 6, characterized in that: The valve core mechanism (55) further comprises a ring frame (552), a third motor (553) and a fan wheel (554); the ring frame (552) is fixedly connected to the inner tube (551) and the third motor (553); the output end of the third motor (553) is fixedly connected to the fan wheel (554); the second connecting tube (54) is provided with an air leakage hole (541); the inner tube (551) is further provided with a third semicircular hole (5512), an air outlet hole (5513), a first air hole (5514), a second air hole (5515) and a third air hole (5516); the cabin (61) is provided with a first air inlet hole (611) and a second air inlet hole (612); Initial detection mode: the third semicircular hole (5512) contacts the second semicircular hole (531), the first air hole (5514) contacts the first air inlet hole (611), and the second air hole (5515) contacts the second air inlet hole (612); Low concentration detection mode: the third air hole (5516) is in contact with the first air inlet hole (611); Broad spectrum detection mode: the third air hole (5516) is in contact with the second air inlet hole (612); Self-cleaning mode: the air outlet hole (5513) is in contact with the air leakage hole (541).

8. A VOC detection device with a rapid water vapor removal function according to claim 7, characterized in that: The detection mechanism (6) further comprises a vertical plate (62); the vertical plate (62), the photoionization detector (65), and the flame ionization detector (66) are all fixedly connected to the cabin (61); the vertical plate (62) and the side of the cabin (61) close to the first air inlet (611) form a first detection chamber (63); the vertical plate (62) and the side of the cabin (61) close to the second air inlet (612) form a second detection chamber (64).

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