Volatile organic gas sampling and analyzing equipment

Abstract

The invention discloses volatile organic gas sampling and analyzing equipment, and relates to the field of gas detection, the volatile organic gas sampling and analyzing equipment comprises a body, the body is provided with a cylinder and a handheld part, the cylinder is internally provided with a piston in a sliding manner, the cylinder is provided with a sampling port, and the piston has a first position for sampling and a second position for sampling completion; the power mechanism is used for switching the piston from the first position to the second position; the handheld part is provided with a control button used for being pressed by fingers, and the control button controls the power mechanism. According to the volatile organic gas sampling analysis equipment provided by the invention, in the whole sampling process, only one hand is needed to operate the sampler, so that the other hand of a worker can be liberated, and the operation is convenient.

Description

Technical Field

[0001] The present invention relates to the field of gas detection, and in particular to a volatile organic gas sampling and analysis device. Background Art

[0002] As is well known, the sampling and analysis of various volatile organic gases is required in the fields of chemical engineering, medicine, environmental protection, mining, aerospace, electronics, etc. The sampling and analysis of volatile organic gases is used to determine the concentration of the corresponding components in the environment or in the volatile objects, thereby confirming the safety of the environment and / or the concentration of the corresponding components in the volatile objects. Obviously, in most cases, the sampling operation cannot be carried out in a laboratory and must be performed in the corresponding contaminated environment.

[0003] For example, the patent document entitled "A Gas Sampler," with authorization announcement number CN 208921513 U and authorization date of May 31, 2019, includes a sampling tube, a piston rod, and a three-way valve. The rear end of the sampling tube is connected to a rear end cap, into which the piston rod extends, and a piston is fixedly connected to the inner end of the piston rod. An annular sealing sleeve 1 is embedded in the outer wall of the piston. The end of the piston facing the piston rod has an axially extending bead with an outer diameter equal to that of the piston. An annular sealing sleeve 2 is embedded in the outer wall of the bead. The bead has a plurality of radially penetrating oil holes evenly distributed around the circumference, and the oil holes are located between the first and second sealing sleeves. The gas sampler provided by this patent has advantages such as good sealing and good lubricity.

[0004] The shortcomings of the above-mentioned patents are that when gas sampling is required in a contaminated environment, the existing gas sampler requires the use of a sampling tube, a piston and a pull rod. The specific operation method is that the staff holds the sampling tube with one hand and pulls the pull rod with the other hand. The pull rod pulls the piston to move and draws the gas into the sampling tube. Two hands are required to operate at the same time. However, in a contaminated environment, the situations are diverse, and operations that require both hands to be performed at the same time are sometimes inconvenient. Summary of the Invention

[0005] The purpose of the present invention is to provide a volatile organic gas sampling and analysis device to solve the above-mentioned deficiencies in the prior art.

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

[0007] A volatile organic gas sampling and analysis device comprises a main body, the main body comprising a cylinder and a handheld portion, a piston being slidably disposed within the cylinder, a sampling port being provided on the cylinder, the piston having a first position for sampling and a second position for completion of sampling; further comprising a power mechanism for switching the piston from the first position to the second position; and a control button for finger pressing being provided on the handheld portion, the control button controlling the power mechanism.

[0008] In the above-mentioned volatile organic gas sampling and analysis equipment, the barrel and the handheld part are an integrated structure.

[0009] In the above-mentioned volatile organic gas sampling and analysis equipment, the power mechanism includes a cylinder, the cylinder is arranged on the cylinder body, and the output end of the cylinder is fixedly connected to the piston.

[0010] The above-mentioned volatile organic gas sampling and analysis equipment, the power mechanism includes a scissor frame, a first mounting frame is fixedly connected to the inner wall of the cylinder, a second mounting frame is fixedly connected to the piston, the two ends of the scissor frame are respectively connected to the first mounting frame and the second mounting frame, the scissor frame is provided with multiple rotating shafts, multiple rotating shafts are provided with torsion springs, and the elastic force direction of multiple torsion springs is all toward the contraction direction of the scissor frame, and a first locking mechanism for fixing the piston in the first position is provided between the piston and the cylinder.

[0011] In the above-mentioned volatile organic gas sampling and analysis equipment, the first locking mechanism includes a first clamping block, which is fixed to the piston. A transmission rod is elastically provided on the cylinder, and the transmission rod is fixed to the control button. A second clamping block is provided on the transmission rod, and the first clamping block is clamped with the second clamping block.

[0012] The above-mentioned volatile organic gas sampling and analysis equipment has an air outlet on the top wall of the cylinder, a baffle is provided on the air outlet, a connecting block is provided on the baffle, a connecting rod is provided on the scissor frame, and the connecting rod is fixedly connected to the connecting block.

[0013] In the above-mentioned volatile organic gas sampling and analysis equipment, the baffle is a telescopic plate.

[0014] In the above-mentioned volatile organic gas sampling and analysis equipment, a first handle is fixedly connected to the cylinder, and a second handle is fixedly connected to the baffle. The baffle is driven to move horizontally by pulling the first handle and the second handle at the same time.

[0015] The above-mentioned volatile organic gas sampling and analysis equipment is based on the horizontal movement of the baffle to drive the scissor frame to extend.

[0016] In the above-mentioned volatile organic gas sampling and analysis equipment, a second filter is provided on the sampling port.

[0017] In the above technical solution, the present invention provides a volatile organic gas sampling and analysis equipment. When sampling is not done, the piston is located in the first position. When sampling is required, the cylinder is held by one hand, and the control button is manually pressed with the finger to start the power mechanism. The power mechanism drives the piston to slide from the first position to the second position. During the sliding of the piston, the gas enters the interior of the cylinder from the sampling port to complete the sampling. The advantage of this is that only one hand needs to be used during the entire sampling process, thereby freeing the other hand of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0020] Figure 2 A schematic front view of the structure of another embodiment of the present invention;

[0021] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at aa in the middle;

[0022] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure at bb in the middle;

[0023] Figure 5 A schematic diagram of a connection structure between a first tooth plate, a second tooth plate, and a gear provided in another embodiment of the present invention;

[0024] Figure 6 for Figure 3 A magnified schematic diagram of the local structure at center A;

[0025] Figure 7 for Figure 3 A magnified schematic diagram of the local structure at point B in the middle;

[0026] Figure 8 for Figure 3 Enlarged schematic diagram of the local structure at point C in the middle.

[0027] Description of reference numerals:

[0028] 1. Main body; 1.1. Cylinder; 1.2. Handle; 2. Piston; 3. Sampling port; 4. Control button; 5. Scissor frame; 6. First mounting bracket; 7. Second mounting bracket; 8. Rotating shaft; 9. First clamping block; 10. Transmission rod; 10.1. U-shaped section; 10.2. L-shaped section; 11. Second clamping block; 12. First avoidance groove; 13. First spring; 14. Air outlet; 15. Baffle; 16. Connecting block; 17. Connecting rod; 18. First handle; 19. Second handle 20. Third clamping block; 21. Locking rod; 21.1. Fourth clamping block; 21.2. Unlocking part; 22. Sliding seat; 23. Second spring; 24. Spring telescopic rod; 25. C-shaped rod; 26. Sealing plate; 27. Abutment part; 28. First filter; 29. Accommodating chamber; 30. First tooth plate; 31. Guide rail; 32. Second tooth plate; 33. Cross bar; 34. Gear; 35. Brush; 36. Lifting rod; 37. Third spring; 38. Second filter; 39. Second avoidance groove. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] In the embodiments of the present invention, for ease of description, the axial direction of the cylinder 1.1 is considered the vertical direction, and the position of the sampling port 3 relative to the cylinder 1.1 is considered the lower direction, i.e., the sampling port 3 is positioned below the cylinder 1.1. The volatile organic gas sampling and analysis equipment provided in this embodiment is primarily used for sampling, but corresponding sensors can be installed on the cylinder 1.1 to detect parameters that can be measured on-site, such as pH, concentration, etc. However, for component analysis, which requires spectroscopy or other equipment, the data must be returned to the laboratory after sampling and input into corresponding dedicated analysis equipment for analysis.

[0031] Reference Figure 1-8 An embodiment of the present invention provides a volatile organic gas sampling and analysis device, including a main body 1, the main body 1 including a cylinder 1.1 and a handheld part 1.2, a piston 2 is slidably arranged in the cylinder 1.1, a sampling port 3 is provided on the cylinder 1.1, the piston 2 has a first position to be sampled and a second position after sampling is completed; it also includes a power mechanism for switching the piston 2 from the first position to the second position; a control button 4 for finger pressing is provided on the handheld part 1.2, and the control button 4 controls the power mechanism.

[0032] The handle 3 of the present invention is provided with a plurality of handles 1 and 2, and a plurality of handles 1 and 2 are provided on the handle 2 of the cylinder 1.1. The piston 2 is a reciprocating mechanism such as a lead screw, and the control button 4 is preferably a push-type button, which is electrically connected to the power mechanism. The first position of the piston 2 (that is, close to the inner bottom wall of the cylinder 1.1) can block the sampling port 3. The second position is a position inside the cylinder 1.1 away from the inner bottom wall of the cylinder 1.1. At this time, the piston 2 divides the cylinder 1.1 into two upper and lower cavities, of which the lower cavity is used to accommodate the sampling gas. The purpose of such a setting is that when no sampling is done, the piston 2 is in the first position. When sampling is required, the cylinder 1.1 is held in one hand, and the control button 4 is manually pressed with the finger to start the power mechanism. The power mechanism drives the piston 2 to slide from the first position to the second position. During the sliding of the piston 2, the gas enters the cylinder 1.1 from the sampling port 3 to complete the sampling. The advantage of this is that only one hand is needed during the entire sampling process, thereby freeing the other hand of the staff.

[0033] Preferably, the cylinder 1.1 and the hand-held portion 1.2 are an integrated structure, and the hand-held portion 1.2 may be an annular structure wrapped around the outside of the cylinder 1.1, and a non-slip structure is provided on its surface to facilitate hand-holding of the cylinder 1.1.

[0034] As an embodiment of the present invention, the power mechanism includes a cylinder (not shown in the figure), which is arranged on the cylinder 1.1, and its output end is fixedly connected to the piston 2. Specifically, the cylinder is fixedly connected to the inner wall of the cylinder 1.1 and close to the top of the cylinder 1.1, and the cylinder is electrically connected to the control button 4. The purpose of such a setting is to drive the driving rod at its output end to contract through the electric power of the cylinder, so that the piston 2 can be switched from the first position to the second position to complete the gas sampling.

[0035] As another preferred embodiment of the present invention, the power mechanism includes a scissor frame 5, which is a deformable frame composed of multiple X-shaped frames hinged in sequence. This is a prior art. A first mounting frame 6 is fixedly connected to the inner wall of the cylinder 1.1, and a second mounting frame 7 is fixedly connected to the piston 2. The two ends of the scissor frame 5 are respectively connected to the first mounting frame 6 and the second mounting frame 7. The scissor frame 5 is provided with multiple rotating shafts 8, and multiple rotating shafts 8 are provided with torsion springs (not shown in the figure), and the elastic direction of the multiple torsion springs is toward the direction of contraction of the scissor frame 5. In the direction, that is, the restoring power of the torsion spring is the direction in which the scissor frame 5 is driven to retract. A first locking mechanism for fixing the piston 2 in the first position is provided between the piston 2 and the cylinder 1.1. Specifically, the end of the cylinder 1.1 away from the sampling port 3 is a sealed structure, that is, the cylinder 1.1 is provided with a top wall to isolate the inner cavity of the cylinder 1.1 from the outside to prevent external dust from entering the cylinder 1.1. The first mounting bracket 6 is fixedly connected to the inner top wall of the cylinder 1.1, and the second mounting bracket 7 is fixedly connected to the upper surface of the piston 2. The first mounting bracket 6 and the second mounting bracket 7 are both arranged horizontally, and the two The first mounting bracket 6 is fixed to the inner top wall of the cylinder 1.1, and the torsion spring is arranged on the rotating shaft 8. The first locking mechanism can be a card connection structure, which is connected to the control button 4. The piston 2 can be unlocked by pressing the control button 4. The effect of such a setting is that before sampling, the piston 2 is fixed in the first position by the first locking mechanism. At this time, the scissor frame 5 is in an extended state. Correspondingly, multiple torsion springs are in a stored force state. When sampling is required, the hand Hold the handle 1.2 and press the control button 4 with your finger to release the locking effect of the first locking mechanism on the piston 2, so that the piston 2 is in a slidable state. At this time, the elastic force stored in the torsion spring is released, thereby driving the scissor frame 5 to retract. Since the top end of the scissor frame 5 is fixed to the inner top wall of the cylinder 1.1 through the first mounting frame 6, and the bottom end is fixed to the piston 2 through the second mounting frame 7, the scissor frame 5 will drive the piston 2 to rise vertically along the inner wall of the cylinder 1.1 when it contracts, thereby sucking the external gas into the inside of the cylinder 1.1 through the sampling port 3 to complete the passive sampling of the gas.

[0036] Preferably, the first locking mechanism includes a first clamping block 9, which is fixed to the piston 2, and a transmission rod 10 is elastically provided on the cylinder 1.1, and the transmission rod 10 is fixed to the control button 4, and a second clamping block 11 is provided on the transmission rod 10, and the first clamping block 9 is clamped with the second clamping block 11. Specifically, there are preferably two first clamping blocks 9 and two second clamping blocks 11, and both are wedge-shaped blocks. The first clamping block 9 is fixed to the lower surface of the piston 2, and the transmission rod 10 includes a U-shaped section 10.1 and an L-shaped section 10.2. The two second clamping blocks 11 are respectively fixed to the two ends of the U-shaped section 10.1 and are respectively clamped with the two first clamping blocks 9. One end of the L-shaped section 10.2 is fixed to the U-shaped section 10.1, and the other end is fixed to the control button 4. A first avoidance groove 12 adapted to the transmission rod 10 and the control button 4 is provided on the inner bottom wall of the cylinder 1.1, so that the transmission rod 10 can be in the first avoidance groove 12 The internal sliding and elastic setting is that a first spring 13 is provided between the transmission rod 10 and the first avoidance groove 12, one end of the first spring 13 is fixed to the L-shaped section 10.2, and the other end is fixed to the side wall of the first avoidance groove 12. The effect of such a setting is that before sampling, the horizontal surface of the first clamping block 9 abuts against the horizontal surface of the second clamping block 11, so that the first clamping block 9 cannot move vertically, thereby fixing the piston 2 in the first position. When sampling, the control button 4 is pressed, and the control button 4 drives the transmission rod 10 to move horizontally and compresses the first spring 13 to store force. The transmission rod 10 drives the second clamping block 11 to move horizontally, so that the horizontal surface of the second clamping block 11 is away from the horizontal surface of the first clamping block 9, thereby releasing the restrictive effect of the second clamping block 11 on the first clamping block 9, so that the piston 2 can slide. After unlocking, release the control button 4, and the control button 4, the transmission rod 10 and the second clamping block 11 are automatically reset under the elastic force of the first spring 13.

[0037] Furthermore, the top wall of the cylinder 1.1 is provided with an air outlet 14, a baffle 15 is provided on the air outlet 14, a connecting block 16 is provided on the baffle 15, a connecting rod 17 is provided on the scissor frame 5, and the connecting rod 17 is fixedly connected to the connecting block 16. Specifically, the air outlet 14 is provided on the top wall of the cylinder 1.1, that is, the air outlet 14 can connect the upper cavity with the outside world, and the baffle 15 is slidably provided on the side wall of the air outlet 14 (the top wall of the cylinder 1.1 is provided with a second avoidance groove 39 adapted to the baffle 15), and the baffle 15 has the function of conducting the air outlet 14. The third position (the third position is a stroke, in which the air outlet 14 is in conduction with the outside world, that is, the baffle 15 is out of the fourth position, that is, the third position, and the air outlet 14 is opened. When the baffle 15 moves from the fourth position to the end of the movement stroke of the third position, the conductive area of the air outlet 14 is the largest. At this time, the scissor frame 5 contracts to the limit state) and the fourth position to block the air outlet 14, the connecting block 16 is a rectangular parallelepiped and is fixed to the lower surface of the baffle 15. There are two rods at the top of the scissor frame 5, and the two rods are symmetrically arranged about the central axis of the cylinder 1.1. The connecting rod 17 is fixedly connected to the rotating shaft 8 at the end of one of the rods at the top of the two scissor fork frames 5 (this rotating shaft 8 can slide along the slide groove, and the two rods at the top and bottom ends of the scissor fork frames 5 are connected by rotation at one end and sliding at the other end, so that they can be deformed. This is a prior art and will not be described in detail). The connecting block 16 is fixedly sleeved on the connecting rod 17. The effect of such a setting is that when no sampling is taken, the baffle 15 is in the fourth position, so that the interior of the cylinder 1.1 is in a sealed state to prevent external dust from entering the cylinder 1.1. When sampling is taken, the torsion spring drives the scissor fork frame 5 to contract, so that the piston 2 is vertical. The scissors frame 5 slides straight upward (thereby dividing the interior of the cylinder 1.1 into two cavities, an upper and a lower cavity), and the rotating shaft 8 connected to the connecting rod 17 at the top end thereof slides horizontally along the slide groove, thereby driving the connecting rod 17 and the connecting block 16 to slide horizontally. Because the connecting block 16 is fixed to the baffle 15, it will drive the baffle 15 to slide horizontally synchronously, thereby switching the baffle 15 from the fourth position to the third position, opening the air outlet 14, and the air inside the upper cavity will be discharged from the air outlet 14 to avoid gas accumulation in the upper cavity, thereby reducing the resistance of the air inside the upper cavity to the rise of the piston 2.

[0038] Preferably, the baffle plate 15 is a telescopic plate. The telescopic plate, i.e., the baffle plate 15, has a composite structure. That is, the baffle plate 15 includes a sleeve (the sleeve includes a top plate and a bottom plate, and the width between the top plate and the bottom plate is the same. The bottom plate and the end of the top plate close to the second avoidance groove 39 are connected by a vertical rod. The side walls of the top plate and the bottom plate are slidably connected to the side wall of the air outlet 14) and a sliding plate slidably disposed within the sleeve (the width of the sliding plate is the same as the width of the top plate, and the side wall of the sliding plate is slidably connected to the side wall of the air outlet 14 to complete the blocking of the air outlet 14). When the baffle plate 15 switches from the fourth position to the third position, the baffle plate 15 contracts. That is, the sleeve contracts into the second avoidance groove 39, and the sliding plate contracts into the sleeve to complete the opening of the air outlet 14, which can reduce the occupied area of the baffle plate 15, that is, the area of the second avoidance groove 39 can be reduced.

[0039] Preferably, a first handle 18 is fixedly connected to the cylinder body 1.1, and a second handle 19 is fixedly connected to the baffle plate 15. By simultaneously pulling the first handle 18 and the second handle 19, the baffle plate 15 is horizontally moved. Specifically, the first handle 18 is fixedly connected to the upper surface of the cylinder body 1.1, and the second handle 19 is fixedly connected to the upper surface of the baffle plate 15. When the baffle plate 15 is in the fourth position, the second handle 19 is closely attached to the first handle 18 to form a ring structure. The sampler can be hung on parts such as a belt through the ring structure of the handle for easy carrying. When the baffle plate 15 needs to be reset when in the third position, the thumb and the other four fingers of one hand respectively hook the first handle 18 and the second handle 19, so that the baffle plate 15 can be switched from the third position to the fourth position to complete the blocking of the air outlet 14.

[0040] Further, based on the horizontal movement of the baffle plate 15 to drive the scissor lift 5 to extend, when the baffle plate 15 switches from the third position to the fourth position, it synchronously drives the connecting block 16 and the connecting rod 17 below it to move horizontally, so that the rotating shaft 8 at the top of the scissor lift 5, which is slidably connected to the chute, slides in the reverse direction, so that the scissor lift 5 transfers from the contracted state to the extended state, thereby transferring the piston 2 from the second position to the first position. During the transfer process, the wedge surfaces of the first block 9 at the bottom of the piston 2 contact and squeeze the wedge surfaces of the second block 11, causing the second block 11, the transmission rod 10, and the control button 4 to move horizontally, realizing the avoidance when the first block 9 descends, and compressing the first spring 13. After the avoidance ends, the second block 11, the transmission rod 10, and the control button 4 automatically reset under the action of the first spring 13. At this time, the horizontal plane of the first block 9 abuts against the horizontal plane of the second block 11 again to realize the passive locking of the piston 2. One end of the second spring 23 is fixedly connected to the side wall of the "冂" - shaped section

[0041] Furthermore, a second locking mechanism is provided on the cylinder body 1.1. A third clamping block 20 is fixedly connected to the inner wall of the cylinder body 1.1. A sliding seat 22 is fixedly connected to the piston 2. A locking rod 21 is slidably connected to the sliding seat 22. A second spring 23 is further provided between the locking rod 21 and the sliding seat 22. The third clamping block 20 is located on the moving stroke of the locking rod 21. Specifically, the locking rod 21 includes a horizontal section and a "冂"-shaped section. The horizontal section is slidably connected inside the sliding seat 22. A fourth clamping block 21.1 is provided at one end of the horizontal section, and the other end is fixedly connected to the "冂"-shaped section. Both the third clamping block 20 and the fourth clamping block 21.1 are wedge-shaped blocks. The wedge surface of the third clamping block 20 is located on the moving stroke of the wedge surface of the fourth clamping block 21.1. One end of the second spring 23 is fixedly connected to the side wall of the "冂"-shaped section, and the other end is fixedly connected to the side surface of the sliding seat 22. The function of this setting is that when the piston 2 moves vertically upward, it will drive the fourth clamping block 21.1 to contact and press against the wedge surface of the third clamping block 20, so that the fourth clamping block 21.1 slides horizontally on the sliding seat 22 to avoid the third clamping block 20, and at the same time stretches the second spring 23, so that the piston 2 can move upward normally. After the third clamping block 20 and the fourth clamping block 21.1 are pressed, the fourth clamping block 21.1 automatically resets under the elastic force of the second spring 23. At this time, the horizontal surfaces of the third clamping block 20 and the fourth clamping block 21.1 are in contact, so that the fourth clamping block 21.1 cannot move downward, thereby fixing the piston 2 in the second position (due to inertia, the piston 2 moves upward excessively, making the torsion spring inside the scissors frame 5 in an over-compressed state, so that the scissors frame 5 has a stress of elongation, making the third clamping block 20 and the fourth clamping block 21.1 close tightly), avoiding the piston 2 from shaking inside the cylinder body 1.1 after sampling.

[0042] Furthermore, a spring telescopic rod 24 is fixed to the cylinder 1.1, and a C-shaped rod 25 is fixed to the spring telescopic rod 24. A blocking plate 26 and an abutment portion 27 are respectively provided at both ends of the C-shaped rod 25. The abutment portion 27 vertically penetrates the top plate of the cylinder 1.1 and the lower end is located on the movement stroke of the sliding seat 22. The blocking plate 26 is located below the cylinder 1.1, and the sampling ports 3 are respectively located on the upward movement stroke of the blocking plate 26. Specifically, the spring telescopic rod 24 is fixed to the upper surface of the top plate of the cylinder 1.1, and the abutment portion 27 penetrates the cylinder 1.1 and extends to the interior of the upper cavity. The function is that when no sampling is taken, under the elastic force of the spring telescopic rod 24, the sealing plate 26 is located below the sampling port 3 but does not block the sampling port 3. When the piston 2 rises vertically inside the cylinder 1.1, it will drive the sliding seat 22 on its top to move upward synchronously. When the piston 2 approaches the second position, the upper surface of the sliding seat 22 will contact and squeeze the bottom end of the abutment 27, and drive the abutment 27, the C-shaped rod 25 and the sealing plate 26 to move upward synchronously (and stretch the spring telescopic rod 24), so that the sealing plate 26 can block the sampling port 3 to avoid gas leakage after sampling, which is convenient and quick.

[0043] Preferably, a first filter 28 is provided on the baffle 15, and the first filter 28 is a soft fabric net. The cross-section of the side wall of the end of the baffle 15 is L-shaped, so that an accommodating cavity 29 is provided between the end of the baffle 15 and the side wall of the air outlet 14, and the first filter 28 is provided in the accommodating cavity 29, that is, the two ends of the first filter 28 are respectively fixed to the two side walls of the accommodating cavity 29. The purpose of such a setting is that when the baffle 15 is switched from the fourth position to the third position, it will drive one end of the first filter 28 to move, thereby expanding the contracted first filter 28. The advantage of this is that when the baffle 15 moves to open the air outlet 14, the first filter 28 will cover the air outlet 14 to prevent dust from entering the upper cavity from the air outlet 14.

[0044] Further, a first toothed plate 30 is provided on the abutting portion 27. A guide rail 31 is fixedly connected inside the cylinder body 1.1. A second toothed plate 32 is slidably connected to the guide rail 31. A cross bar 33 is fixedly connected inside the cylinder body 1.1. A gear 34 is rotatably provided on the cross bar 33. Both the first toothed plate 30 and the second toothed plate 32 are engaged with the gear 34. One end of the second toothed plate 32 is fixedly connected with a brush 35 through a vertical member. Specifically, the first toothed plate 30 is vertically arranged, the second toothed plate 32 is horizontally arranged, and the thickness of the gear 34, that is, the axial dimension, is greater than the sum of the thicknesses of the first toothed plate 30 and the second toothed plate 32. The brush 35 is located below the first filter screen 28. The function of this setting is that in the initial state, it is below the connection point of the first filter screen 28 and the side wall of the air outlet 14. When the piston 2 moves vertically upward, it will带动 the sliding seat 22 and the abutting portion 27 to move upward. The upward movement of the abutting portion 27 will带动 the first toothed plate 30 to move upward. Since the first toothed plate 30 is engaged with the gear 34, therefore, the upward movement of the first toothed plate 30 will带动 the gear 34 to rotate. Since the gear 34 is also engaged with the second toothed plate 32, therefore, the rotation of the gear 34 will带动 the second toothed plate 32 to move horizontally. And because the brush 35 is fixedly connected to the second toothed plate 32, so the brush 35 will move horizontally synchronously with the second toothed plate 32, so that the brush 35 can clean the unfolded first filter screen 28, avoiding poor exhaust caused by the blockage of the first filter screen 28.

[0045] Furthermore, a lifting rod 36 is slidably penetrated through the top wall of the cylinder body 1.1, and a third spring 37 is provided between the lifting rod 36 and the inner top wall of the cylinder body 1.1. The locking rod 21 further includes an unlocking portion 21.2, and the unlocking portion 21.2 is also the "冂" - shaped section. The unlocking portion 21.2 is located on the movement stroke of the lifting rod 36. Specifically, the lifting rod 36 includes a horizontal section and a vertical section. One end of the third spring 37 is fixedly connected to the horizontal section, and the other end is fixedly connected to the inner top wall of the cylinder body 1.1. The vertical section of the lifting rod 36 penetrates through the first handle 18 and extends above the first handle 18, and the bottom end of the lifting rod 36 is arc - shaped. The unlocking portion 21.2 is a wedge - shaped block, and its wedge - shaped surface is located on the movement stroke of the bottom end of the lifting rod 36. The function of this setting is that when pressing the top end of the lifting rod 36, the top end of the lifting rod 36 moves vertically downward and stretches the third spring 37. During the downward movement of the lifting rod 36, its bottom end will contact and squeeze the wedge - shaped surface of the unlocking portion 21.2, causing the unlocking portion 21.2 to move horizontally. Since the unlocking portion 21.2 and the fourth latch 21.1 are integrated, the horizontal movement of the unlocking portion 21.2 will synchronously带动 the fourth latch 21.1 to move horizontally to解除 the latching effect between the third latch 20 and the fourth latch 21.1, so that the piston 2 can move downward normally. After manual unlocking, the lifting rod 36 automatically resets under the action of the third spring 37, that is, each time the sampling device provided by the embodiments of the present invention is used after sampling, it needs to be manually unlocked to ensure the stability of gas preservation.

[0046] Preferably, a second filter 38 is provided on the sampling port 3. The second filter 38 is used to prevent foreign matter in the air from entering the interior of the cylinder 1.1 during sampling, so as to ensure the cleanliness of the sampled gas.

[0047] To sum up, when using the sampler, when sampling, press the control button 4 to release the locking effect of the first locking mechanism on the piston 2, and then the piston 2 moves vertically upward along the inner wall of the cylinder 1.1 under the action of the torsion spring of the scissor frame 5. The scissor frame 5 will shrink when it moves upward, so that the connecting rod 17 drives the baffle 15 to open to discharge the air inside the upper cavity, and then the piston 2 continues to move upward. There are two strokes in the process of the piston 2 moving upward. First, the upward movement of the piston 2 drives the sliding seat 22 to abut against the abutment 27, so that the sealing plate 26 can block the sampling port 3 to complete the sampling, and in the process of the abutment 27 rising, it will drive the brush 35 to clean the first filter 28. Second, the abutment stroke of the third block 20 and the fourth block 21.1 allows the piston 2 to be locked in the second position. When discharging gas, there are two strokes. First, press the top of the lifting rod 36 with the palm of your hand to release the locking effect of the second locking mechanism on the piston 2. Second, use your thumb and the other four fingers to hook the first handle 18 and the second handle 19 respectively, so that the two are close to each other, so that the baffle 15 can be switched from the third position to the fourth position, and in the process of the baffle 15 moving, the scissor frame 5 will be changed from the contracted state to the extended state, so that the piston 2 moves vertically downward on the inner wall of the cylinder 1.1. During the downward movement, the sealing plate 26 moves vertically downward under the action of its own gravity and the elastic force of the spring telescopic rod 24 to release the blockage of the sampling port 3. When the piston 2 switches from the second position to the first position, the first locking mechanism will automatically lock the piston 2 again to complete a complete sampling and exhaust process.

[0048] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A volatile organic gas sampling and analysis device, comprising a body, the body comprising a cylinder and a handheld portion, a piston slidably disposed in the cylinder, and a sampling port disposed on the cylinder, characterized in that: The piston has a first position to be sampled and a second position in which the sampling is completed; Also included is a power mechanism for switching the piston from the first position to the second position; The handheld portion is provided with a control button for pressing by a finger, and the control button controls the power mechanism.

2. The volatile organic gas sampling and analysis equipment according to claim 1, characterized in that: The barrel and the hand-held part are an integrated structure.

3. The volatile organic gas sampling and analysis equipment according to claim 1, characterized in that: The power mechanism includes a cylinder, which is arranged on the cylinder body, and the output end of the cylinder is fixedly connected to the piston.

4. The volatile organic gas sampling and analysis equipment according to claim 1, characterized in that: The power mechanism includes a scissor frame, a first mounting frame is fixedly connected to the inner wall of the cylinder, a second mounting frame is fixedly connected to the piston, both ends of the scissor frame are connected to the first mounting frame and the second mounting frame respectively, a plurality of rotating shafts are provided on the scissor frame, a plurality of rotating shafts are provided with torsion springs, and the elastic force direction of the plurality of torsion springs is all toward the contraction direction of the scissor frame, and a first locking mechanism for fixing the piston in the first position is provided between the piston and the cylinder.

5. The volatile organic gas sampling and analysis equipment according to claim 4, characterized in that: The first locking mechanism includes a first clamping block, which is fixed to the piston. A transmission rod is elastically provided on the cylinder, and the transmission rod is fixed to the control button. A second clamping block is provided on the transmission rod, and the first clamping block is clamped with the second clamping block.

6. The volatile organic gas sampling and analysis equipment according to claim 4, characterized in that: An air outlet is provided on the top wall of the cylinder, a baffle is provided on the air outlet, a connecting block is provided on the baffle, a connecting rod is provided on the scissor frame, and the connecting rod is fixedly connected to the connecting block.

7. The volatile organic gas sampling and analysis equipment according to claim 6, characterized in that: The baffle is a telescopic plate.

8. The volatile organic gas sampling and analysis equipment according to claim 6, characterized in that: A first handle is fixedly connected to the cylinder, and a second handle is fixedly connected to the baffle. The baffle is driven to move horizontally by pulling the first handle and the second handle at the same time.

9. The volatile organic gas sampling and analysis equipment according to claim 7, characterized in that: The horizontal movement of the baffle drives the scissor frame to extend.

10. The volatile organic gas sampling and analysis equipment according to claim 1, characterized in that: A second filter screen is provided on the sampling port.

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