An automatic sampling device for small-flow indoor ambient air

Abstract

The present invention provides a low-flow automatic sampling device for indoor ambient air, comprising a base, a rotating shaft, a piston mechanism, an air inlet pipe, a connecting pipe, an injection tube, and a conversion mechanism. The piston mechanism comprises a cylinder and a piston. The first end of the air inlet pipe is used to connect to ambient air. The first end of the connecting pipe is connected to the cylinder. The first end of the injection tube is used to connect to a sample container. The conversion mechanism comprises a conversion body and a connecting chamber, wherein the conversion body is provided with a first air inlet hole and a first injection hole connected to the connecting chamber. The second end of the connecting tube is connected to the connecting chamber. The rotating shaft is configured to drive the piston to reciprocate within the cylinder; drive the conversion body to connect the second end of the air inlet pipe to the first air inlet hole and the second end of the injection tube to the first injection hole in an intake state; and to connect the second end of the air inlet pipe to the first air inlet hole and connect the second end of the injection tube to the first injection hole in an exhaust state. This device does not use a solenoid valve, thereby improving reliability and reducing equipment costs.

Description

Technical Field

[0001] The present invention relates to the technical field of prevention and control of ship ambient air pollutants, and in particular to an automatic sampling device for small-flow indoor ambient air. Background Art

[0002] During a ship's voyage, the operation of mechanical equipment, human activity, and non-metallic materials within enclosed cabins release significant amounts of volatile organic compounds (VOCs), a significant factor affecting cabin air quality. Currently, sampling air from enclosed cabins on ships typically involves the use of a piston-type sampling pump. This pump, driven by a motor, draws and exhausts a piston rod, achieving a quantitative draw of air from the target space and injecting the resulting volume into a sample container, such as a sample bottle or tube.

[0003] However, the above technical solution requires the piston cylinder to be equipped with an air inlet pipe and an injection pipe, and a solenoid valve on each pipe to control the on / off of the two pipes. This requires a complex control circuit to match the solenoid valve, which affects the reliability of the device and increases the cost of the device. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a small-flow indoor ambient air automatic sampling device that overcomes the above problems or at least partially solves the above problems. It can control the on-off of the air intake pipe and the injection tube without using a solenoid valve, thereby achieving the purpose of improving the reliability of the equipment and reducing the cost of the equipment.

[0005] Specifically, the present invention provides a small-flow indoor ambient air automatic sampling device, which includes a base, a rotating shaft, a piston mechanism, an air inlet pipe, a connecting pipe, an injection tube and a conversion mechanism.

[0006] The rotating shaft is rotatably connected to the machine base along the axial direction, and the rotating shaft is transmission-connected to the first motor.

[0007] The piston mechanism includes a cylinder and a piston.

[0008] The first end of the air inlet pipe is connected to the ambient air. The first end of the connecting pipe is connected to the cylinder. The first end of the injection tube is connected to the sample container.

[0009] The conversion mechanism includes a conversion body and a connecting cavity formed in the conversion body, wherein the conversion body is provided with a first air inlet and a first injection hole communicating with the connecting cavity. The second end of the connecting pipe is connected with the connecting cavity.

[0010] The rotating shaft is configured to:

[0011] The piston is driven to reciprocate in the cylinder to form an intake state and an exhaust state.

[0012] The conversion body is driven to connect the second end of the air intake pipe to the first air intake hole and to cut off the second end of the injection pipe from the first injection hole when the piston mechanism is in the air intake state.

[0013] The conversion body is driven to cut off the second end of the air intake pipe from the first air intake hole and connect the second end of the injection tube to the first injection hole when the piston mechanism is in the exhaust state.

[0014] Optionally, the rotating shaft drives the piston to reciprocate in the cylinder through a cam mechanism, and the cam mechanism includes a cam and a push rod.

[0015] The cam is coaxially fixedly connected to the rotating shaft.

[0016] The push rod is slidably connected to the machine base along the axial direction of the cylinder, and the push rod is configured so that one end abuts against the cam and the other end is fixedly connected to the piston.

[0017] Optionally, the conversion mechanism further includes a conversion cover, and the conversion cover is fixedly connected to the machine base.

[0018] The conversion body is cylindrical and coaxially fixedly connected to the rotating shaft. The first air inlet and the first injection hole are both arc-shaped holes coaxial with the rotating shaft.

[0019] The conversion housing sealing cover is disposed on the exterior of the conversion body. The conversion housing is provided with a second air inlet corresponding to the first air inlet, and a second injection hole corresponding to the first injection hole. The second air inlet is connected to the second end of the air inlet pipe, or the second air inlet forms the air inlet pipe. The second injection hole is connected to the second end of the injection pipe.

[0020] When the ejector pin is in the pushing stroke, the first air inlet and the second air inlet are blocked, and the first injection hole is connected to the second injection hole. When the ejector pin is in the returning stroke, the first air inlet and the second air inlet are connected, and the first injection hole and the second injection hole are blocked.

[0021] Optionally, the conversion cover is cylindrical with one end open, the peripheral wall of the conversion cover is sealed to the peripheral wall of the conversion body, and the bottom wall of the conversion cover is sealed to the bottom wall of the conversion body at one end away from the cam.

[0022] The first injection hole is located on the peripheral wall of the conversion body, and the second injection hole is located on the peripheral wall of the conversion cover.

[0023] The first air inlet hole is located on the bottom wall of the conversion body at one end away from the cam, and the second air inlet hole is located on the bottom wall of the conversion cover.

[0024] Optionally, a first connecting hole communicating with the connecting cavity is further provided on the peripheral wall of the conversion body. The first connecting hole is an arc-shaped hole coaxial with the rotating shaft, and there are two first connecting holes spaced apart along the circumferential direction.

[0025] A second connecting hole corresponding to the first connecting hole is further provided on the peripheral wall of the conversion housing, and the second connecting hole is connected to the second end of the connecting pipe.

[0026] When the push rod is in the pushing stroke, the second connecting hole is blocked from the first first connecting hole and is connected to the second first connecting hole. When the push rod is in the returning stroke, the second connecting hole is connected to the first first connecting hole and is blocked from the second first connecting hole.

[0027] Optionally, the automatic ambient air sampling device further includes a sample rack, an injection nozzle and a sliding mechanism.

[0028] The sample rack is provided with a plurality of sample containers, wherein the air inlet ends of all the sample containers are located on a first plane. The air inlet end of each sample container is provided with a conical air inlet and a ejector pin in the air inlet, wherein the ejector pin is configured to open the air inlet when squeezed.

[0029] The rear end of the injection nozzle is connected to the first end of the injection tube, and the front end of the injection nozzle abuts against the air inlet end of at least one of the sample containers. The front end of the injection nozzle is provided with a conical injection port and a top ball located at the injection port, wherein the top ball is configured to open the injection port when squeezed.

[0030] The sliding mechanism is configured to cause the injection nozzle and the sample container to slide relative to each other along the first plane, so that the injection nozzle injects gas into all the sample containers in sequence.

[0031] Optionally, the injection nozzle is axially slidably connected to the first end of the injection tube. A spring is abutted against the rear end of the injection nozzle.

[0032] Optionally, the sliding mechanism includes a fixed seat, a screw rod and a slider.

[0033] The fixing seat is fixedly arranged, the sample rack is fixedly connected to the fixing seat, and all the sample containers are located on a first straight line.

[0034] The screw is rotatably connected to the fixing seat along the axial direction, and the screw is transmission-connected to the second motor. The axis of the screw is parallel to the first straight line.

[0035] The slider is connected to the screw rod through thread transmission. The machine base is fixedly connected to the slider.

[0036] Optionally, the automatic ambient air sampling device further includes a protective cover, the protective cover being cylindrical with one end open, the bottom of the protective cover being fixedly connected to the fixed base. The base, the rotating shaft, the piston mechanism, the conversion mechanism, and the injection nozzle are all located within the protective cover. The first end of the air inlet pipe is located within the opening of the protective cover.

[0037] Optionally, a slide groove is provided on the inner side of the peripheral wall of the protective cover, and the slide groove is parallel to the axis of the screw rod. A protrusion slidably connected to the slide groove is provided on the machine base.

[0038] Optionally, a peripheral wall of the protective cover is provided with a mounting groove, the mounting groove being parallel to the axis of the screw rod, and the mounting groove forming the sample holder.

[0039] In the automatic sampling device for indoor ambient air with a small flow rate of the present invention, a conversion mechanism driven by a rotating shaft is provided, so that while the rotating shaft drives the piston mechanism to inhale and exhaust air, it also drives the conversion mechanism to form a connected or disconnected state corresponding to the intake state and exhaust state between the second end of the air inlet pipe and the first air inlet hole, and between the second end of the injection tube and the first injection hole. In other words, the on-off state of the air inlet pipe and the injection tube is achieved by mechanical coupling. The technical solution of the present invention does not require the provision of solenoid valves on the air inlet pipe and the injection tube, avoiding the provision of complex control circuits matching the solenoid valves, thereby achieving the effect of improving the reliability of the equipment and reducing the cost of the equipment.

[0040] Furthermore, the low-flow indoor ambient air automatic sampling device of the present invention utilizes a sample rack capable of accommodating multiple sample containers, an injection nozzle, and a sliding mechanism, enabling the automatic sampling device to automatically perform multiple sampling operations. This reduces human intervention and improves the user experience.

[0041] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0043] Figure 1is a schematic structural diagram of an automatic ambient air sampling device according to one embodiment of the present invention;

[0044] Figure 2 is a schematic front view of an automatic ambient air sampling device according to one embodiment of the present invention;

[0045] Figure 3 is a schematic side view of an automatic ambient air sampling device according to one embodiment of the present invention;

[0046] Figure 4 is a schematic top view of an automatic ambient air sampling device according to one embodiment of the present invention, with some components hidden;

[0047] Figure 5 is a schematic side view of an automatic ambient air sampling device according to one embodiment of the present invention, with some components hidden;

[0048] Figure 6 is a schematic partial structural diagram of an automatic ambient air sampling device according to one embodiment of the present invention;

[0049] Figure 7 yes Figure 3 Schematic cross-section along the M axis;

[0050] Figure 8 is a schematic partial cross-sectional view of a cam mechanism of an automatic ambient air sampling device according to one embodiment of the present invention in a near-rest state;

[0051] Figure 9 is a schematic partial cross-sectional view of a cam mechanism of an automatic ambient air sampling device according to one embodiment of the present invention in a push stroke;

[0052] Figure 10 is a schematic partial cross-sectional view of a cam mechanism of an automatic ambient air sampling device according to one embodiment of the present invention in a far rest position;

[0053] Figure 11 is a schematic partial cross-sectional view of a cam mechanism of an automatic ambient air sampling device according to one embodiment of the present invention in a return stroke;

[0054] Figure 12 is a schematic partial cross-sectional view of an automatic ambient air sampling device according to one embodiment of the present invention;

[0055] Figure 13 4 is a schematic partial cross-sectional view of an automatic ambient air sampling device according to one embodiment of the present invention.

[0056] List of reference numerals:

[0057] 10. Base; 20. Rotating shaft; 30. First motor; 40. Piston mechanism; 42. Cylinder; 44. Piston; 52. Air inlet pipe; 52a. First end of the air inlet pipe; 52b. Second end of the air inlet pipe; 54. Connecting pipe; 54a. First end of the connecting pipe; 54b. Second end of the connecting pipe; 56. Injection tube; 56a. First end of the injection tube; 56b. Second end of the injection tube; 60. Sample container; 62. Air inlet; 64. Ejector pin; 70. Conversion mechanism; 72. Conversion body; 74. Connecting chamber; 81. First air inlet hole; 82. First injection hole; 83, first connecting hole; 76, conversion cover; 84, second air inlet; 85, second injection hole; 86, second connecting hole; 90, cam mechanism; 92, cam; 94, ejector rod; 110, sample rack; 120, injection nozzle; 122, injection port; 124, ejector ball; 130, sliding mechanism; 132, fixing seat; 134, screw rod; 136, slider; 138, second motor; 140, protective cover; 142, slide groove; 144, bump; 146, mounting groove; 150, first plane; 160, first straight line. DETAILED DESCRIPTION

[0058] Refer to the following Figures 1 to 13 To describe the low-flow indoor environmental air automatic sampling device of the embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0059] Unless otherwise expressly defined or limited, terms such as "disposed," "installed," "connected," "connected," "fixed," and "coupled" should be broadly interpreted. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly defined. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0060] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. That is, in the description of this embodiment, the first feature being "above," "above," and "above" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below," "below," or "below" the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0061] In the description of the present embodiment, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0062] Figure 1 FIG. 1 is a schematic structural diagram of an automatic sampling device for small-flow indoor ambient air according to an embodiment of the present invention. Figure 1 As shown, and reference Figures 2 to 13 An embodiment of the present invention provides an automatic sampling device, including a base 10, a rotating shaft 20, a piston mechanism 40, an air inlet pipe 52, a connecting pipe 54, an injection tube 56 and a conversion mechanism 70.

[0063] The rotating shaft 20 is rotatably connected to the base 10 along the axial direction, and the rotating shaft 20 is transmission-connected to the first motor 30 .

[0064] The piston mechanism 40 includes a cylinder 42 and a piston 44 .

[0065] The first end 52a of the air inlet tube is connected to the ambient air. The first end 54a of the connecting tube is connected to the cylinder 42. The first end 56a of the injection tube is connected to the sample container 60.

[0066] The conversion mechanism 70 includes a conversion body 72 and a connecting cavity 74 formed in the conversion body 72. The conversion body 72 is provided with a first air inlet 81 and a first injection hole 82 communicating with the connecting cavity 74. The second end 54b of the connecting pipe is communicated with the connecting cavity 74.

[0067] The shaft 20 is configured as follows:

[0068] The driving piston 44 reciprocates in the cylinder 42 to form an intake state and an exhaust state.

[0069] The conversion body 72 is driven to connect the second end 52b of the intake pipe to the first intake hole 81 and to cut off the second end 56b of the injection pipe from the first injection hole 82 when the piston mechanism 40 is in the intake state.

[0070] as well as

[0071] The conversion body 72 is driven to cut off the second end 52 b of the intake pipe from the first intake hole 81 and connect the second end 56 b of the injection tube to the first injection hole 82 when the piston mechanism 40 is in the exhaust state.

[0072] In this embodiment, the first motor 30 is used to drive the rotating shaft 20 to rotate. The rotating shaft 20 can drive the piston 44 to reciprocate in the cylinder 42 through a connecting rod mechanism, a cam mechanism 90, etc.

[0073] Cylinder 42 has a fixed volume. During a single intake and exhaust cycle, it draws a fixed amount of sample gas from the ambient air through intake pipe 52 and then injects the fixed amount of sample gas into sample container 60 through injection pipe 56. Sample container 60 can be vacuumed to contain the sample gas, or it can be a sampling tube filled with a specific adsorbent material to enrich the target air pollutant. Sample container 60 can be a sample bottle, sample tube, or the like.

[0074] After completing the sample gas sampling, the staff can take away the sample container 60 and detect the sample gas therein. Of course, the automatic sampling device can also be provided with or connected to an automatic detection device to achieve automatic detection of the sample gas.

[0075] A connecting chamber 74 is provided in the conversion body 72 for opening the passage between the cylinder 42 and the ambient air and closing the passage between the cylinder 42 and the sample container 60 when the piston mechanism 40 inhales air; and for closing the passage between the cylinder 42 and the ambient air and opening the passage between the cylinder 42 and the sample container 60 when the piston mechanism 40 exhausts air.

[0076] For example, the first air inlet 81 and the first injection port 82 may each be provided with a mechanical valve, each of which is connected to the rotating shaft 20 (e.g., via a connecting rod mechanism). During one rotation cycle of the rotating shaft 20, the piston mechanism 40 sequentially undergoes an intake state and an exhaust state. In the intake state, the rotating shaft 20 drives the mechanical valve at the first air inlet 81 to rotate and open, and drives the mechanical valve at the first injection port 82 to rotate and close. In the exhaust state, the rotating shaft 20 drives the mechanical valve at the first air inlet 81 to rotate and close, and drives the mechanical valve at the first injection port 82 to rotate and open.

[0077] For example, a sliding door can be provided on the inner or outer side of each of the first air inlet 81 and the first injection hole 82 in a sealed manner, and the two sliding doors are respectively connected to the rotating shaft 20 (for example, connected to the rotating shaft 20 via a connecting rod mechanism). During one rotation cycle of the rotating shaft 20, the piston mechanism 40 sequentially experiences an intake state and an exhaust state. In the intake state, the rotating shaft 20 drives the sliding door at the first air inlet 81 to slide and open, and drives the sliding door at the first injection hole 82 to slide and close. In the exhaust state, the rotating shaft 20 drives the sliding door at the first air inlet 81 to slide and close, and drives the sliding door at the first injection hole 82 to slide and open.

[0078] In the automatic sampling device of this embodiment, a conversion mechanism 70 driven by the rotating shaft 20 is provided to achieve the on / off state of the air intake pipe 52 and the injection pipe 56 through mechanical coupling. This technical solution eliminates the need for solenoid valves in the air intake pipe 52 and the injection pipe 56, avoiding the need for complex control circuits to match the solenoid valves, thereby improving the reliability of the device and reducing its cost.

[0079] In some embodiments of the present invention, Figure 6-11 As shown, the rotating shaft 20 drives the piston 44 to reciprocate in the cylinder 42 through the cam mechanism 90 . The cam mechanism 90 includes a cam 92 and a push rod 94 .

[0080] The cam 92 is coaxially fixedly connected to the rotating shaft 20 .

[0081] The push rod 94 is slidably connected to the base 10 along the axial direction of the cylinder 42 . The push rod 94 is configured such that one end thereof abuts against the cam 92 and the other end thereof is fixedly connected to the piston 44 .

[0082] In this embodiment, the push rod 94 or the piston 44 may be connected to an elastic element (such as a spring) to force one end of the push rod 94 to always contact the outer edge surface of the cam 92 .

[0083] Cam 92 is coaxially fixedly connected to shaft 20. Cam 92 can complete one or more travel cycles per rotation of shaft 20, which can be set as needed. In this embodiment, with each rotation of shaft 20, push rod 94 successively enters four states: far rest, return stroke, near rest, and push stroke.

[0084] Wherein push rod 94 can drive piston mechanism 40 to form exhaust state when being in push stroke, and can drive piston mechanism 40 to form suction state when being in return stroke.When being in near rest and far rest, piston mechanism 40 is in static state.

[0085] Compared to the automatic sampling device of this embodiment, which uses a connecting rod mechanism to drive the piston 44 to reciprocate within the cylinder 42, the cam mechanism 90 can keep the piston mechanism 40 in a stationary state at both the near and far rest positions. This provides the conversion mechanism 70 with sufficient time for switching, preventing sample gas backflow during switching and resulting in ineffective sample quantification. For example, this allows the conversion mechanism 70 sufficient time to fully and completely open or close a mechanical valve, sliding door, or the like.

[0086] In some embodiments of the present invention, Figure 6-11 As shown, the conversion mechanism 70 further includes a conversion cover 76 , which is fixedly connected to the base 10 .

[0087] The conversion body 72 is cylindrical and coaxially fixedly connected to the rotating shaft 20. The first air inlet 81 and the first injection hole 82 are both arc-shaped holes coaxial with the rotating shaft 20.

[0088] The conversion housing 76 sealing cover is disposed on the outside of the conversion body 72. The conversion housing 76 is provided with a second air inlet hole 84 corresponding to the first air inlet hole 81 and a second injection hole 85 corresponding to the first injection hole 82. The second air inlet hole 84 is connected to the second end 52b of the air inlet pipe, or the second air inlet hole 84 forms the air inlet pipe 52. The second injection hole 85 is connected to the second end 56b of the injection pipe.

[0089] When the ejector pin 94 is in the push stroke, the first air inlet 81 and the second air inlet 84 are blocked, and the first injection hole 82 is connected to the second injection hole 85. When the ejector pin 94 is in the return stroke, the first air inlet 81 and the second air inlet 84 are connected, and the first injection hole 82 and the second injection hole 85 are blocked.

[0090] In this embodiment, the conversion mechanism 70 is provided with a sliding door to realize the opening and closing of the first air inlet 81 and the first injection hole 82. The second air inlet 84 and the second injection hole 85 can be circular holes.

[0091] Specifically, the conversion cover 76 is fixedly connected to the machine base 10. When the rotating shaft 20 drives the conversion body 72 to rotate, the peripheral wall of the conversion cover 76 rotates and slides relative to the peripheral wall of the conversion body 72, and the bottom wall of the conversion cover 76 rotates and slides relative to a bottom wall of the conversion body 72.

[0092] When the first air inlet hole 81 and / or the first injection hole 82 are located on the peripheral wall of the conversion body 72, the first air inlet hole 81 and / or the first injection hole 82 are arc-shaped holes extending circumferentially on the cylindrical peripheral wall. When the first air inlet hole 81 and / or the first injection hole 82 are located on a bottom wall of the conversion body 72, the first air inlet hole 81 and / or the first injection hole 82 are arc-shaped holes extending circumferentially on the flat bottom wall.

[0093] The length of the arc-shaped hole of the first air inlet hole 81 and / or the first injection hole 82 (or the central angle of the arc-shaped hole) can be set according to the push motion angle and the return motion angle.

[0094] By providing a first air inlet hole 81 and a first injection hole 82 on the peripheral wall and / or bottom wall of the conversion body 72, and correspondingly providing a second air inlet hole 84 and a second injection hole 85 on the peripheral wall and / or bottom wall of the conversion cover 76, a connection is established when the first air inlet hole 81 and the second air inlet hole 84, or the second air inlet hole 84 and the second injection hole 85 meet. Otherwise, a blockage is achieved.

[0095] Compared to using complex mechanical valves to switch the on / off states of the first air inlet 81 and the first injection port 82, the automatic sampling device of this embodiment utilizes a simpler structure in the conversion housing 76. Furthermore, the need for a transmission mechanism between the mechanical valve and the rotating shaft 20 is eliminated, with the rotating shaft 20 simply being fixedly connected to the conversion body 72. This technical solution offers a simple structure, high reliability, and low cost.

[0096] In some embodiments of the present invention, Figure 6-11 As shown, the conversion cover 76 is cylindrical with one end open, the peripheral wall of the conversion cover 76 is sealed and fitted with the peripheral wall of the conversion body 72, and the bottom wall of the conversion cover 76 is sealed and fitted with the bottom wall of the end of the conversion body 72 away from the cam 92.

[0097] The first injection hole 82 is located on the peripheral wall of the conversion body 72 , and the second injection hole 85 is located on the peripheral wall of the conversion cover 76 .

[0098] The first air inlet hole 81 is located on a bottom wall of the conversion body 72 at an end away from the cam 92 , and the second air inlet hole 84 is located on a bottom wall of the conversion cover 76 .

[0099] In this embodiment, the first injection hole 82 and the first air inlet 81 are respectively located on the peripheral wall and the bottom wall of the conversion body 72, which can fully utilize the wall surface of the conversion body 72, minimize the volume of the connecting cavity 74, and improve the accuracy of collecting the sample gas amount.

[0100] In some embodiments of the present invention, Figure 6-11 As shown, a first connecting hole 83 communicating with the connecting cavity 74 is further provided on the peripheral wall of the conversion body 72 . The first connecting hole 83 is an arc-shaped hole coaxial with the rotating shaft 20 , and two first connecting holes 83 are provided at intervals along the circumferential direction.

[0101] A second connecting hole 86 corresponding to the first connecting hole 83 is further provided on the peripheral wall of the conversion housing 76 , and the second connecting hole 86 is connected to the second end 54 b of the connecting pipe.

[0102] When the push rod 94 is in the push stroke, the second connecting hole 86 is cut off from the first first connecting hole 83 and is connected to the second first connecting hole 83. When the push rod 94 is in the return stroke, the second connecting hole 86 is connected to the first first connecting hole 83 and is cut off from the second first connecting hole 83.

[0103] in, Figure 9 The arrow in the middle shows the direction of gas flow during the return journey. Figure 11 The arrows in the middle indicate the direction of gas flow during the push stroke.

[0104] In this embodiment, the connecting pipe 54 connects and disconnects the cylinder 42 and the connecting chamber 74 through the first connecting hole 83 and the second connecting hole 86. The second connecting hole 86 can be a circular hole.

[0105] The first connecting hole 83 is an arc-shaped hole extending circumferentially on the cylindrical wall. The lengths of the two arc-shaped holes (or the central angles of the arc-shaped holes) can be adjusted according to the angles of the push stroke and the return stroke. This ensures that one of the first connecting hole 83 and the second connecting hole 86 are connected during both the push stroke and the return stroke.

[0106] In particular, it can be arranged that both the first connecting holes 83 and the second connecting hole 86 are cut off when the far stop and the near stop are in effect, so as to avoid gas backflow and prevent the amount of sample gas injected into the sample container 60 from being affected.

[0107] In some embodiments of the present invention, Figure 7 and Figure 12-13 As shown, the automatic sampling device further includes a sample holder 110 , an injection nozzle 120 and a sliding mechanism 130 .

[0108] A plurality of sample containers 60 are mounted on the sample rack 110, and the air inlet ends of all the sample containers 60 are located on the first plane 150. The air inlet end of each sample container 60 is provided with a conical air inlet 62 and a ejector pin 64 located in the air inlet 62, and the ejector pin 64 is configured to open the air inlet 62 when squeezed.

[0109] The rear end of the injection nozzle 120 is connected to the first end 56a of the injection tube, and the front end of the injection nozzle 120 contacts the air inlet end of at least one sample container 60. The front end of the injection nozzle 120 is provided with a conical injection port 122 and a top ball 124 located at the injection port 122. The top ball 124 is configured to open the injection port 122 when squeezed.

[0110] The sliding mechanism 130 is configured to cause the injection nozzle 120 and the sample container 60 to slide relative to each other along the first plane 150 , so that the injection nozzle 120 injects gas into all the sample containers 60 in sequence.

[0111] In this embodiment, the plurality of sample containers 60 may be arranged according to a preset curve, such as in a straight line, in a circle, or along a spiral line.

[0112] The injection nozzle 120 can remain in a fixed position, and the sliding mechanism 130 can cause the sample container 60 or the sample rack 110 to slide along a preset curve, so that the sample containers 60 slide past the injection nozzle 120 in sequence, allowing the injection nozzle 120 to inject sample gas into the corresponding sample container 60. Of course, it is also possible to configure the sample rack 110 and sample container 60 to remain in a fixed position, and the injection nozzle 120 to slide along the preset curve, slide past each sample container 60 in sequence, and inject sample gas into the corresponding sample container 60.

[0113] When the preset curve is a straight line, the sliding mechanism 130 can be a linear movement mechanism, such as a screw transmission mechanism, an electric push rod, etc. When the preset curve is a circle, the sliding mechanism 130 can be a rotation mechanism, etc.

[0114] In this embodiment, the air inlet end of the sample container 60 has a planar area, and the air inlet ends of all the sample containers 60 are located on the first plane 150 , so that when the injection port 122 contacts the air inlet end of any sample container 60 , the injection port 122 can slide relatively along the first plane 150 .

[0115] The injection nozzle 120 may be provided with elastic elements, magnetic elements, etc. to ensure that the front end of the injection nozzle 120 always contacts the sample container 60 . The injection port 122 is conical, and the outer contour of the injection port 122 matches the inner contour of the air inlet 62 .

[0116] When injection port 122 contacts air inlet 62 during relative sliding motion, the elastic element, magnetic element, and other mechanisms allow injection port 122 to be inserted into air inlet 62. The outer periphery of injection port 122 seals against the inner wall of air inlet 62. Ejector pin 64 within air inlet 62 and ejector ball 124 within injection port 122 come into contact and compress each other, forcing ejector pin 64 to move into air inlet 62, opening air inlet 62, and ejector ball 124 to move into injection port 122, opening injection port 122. In other words, injection port 122 and air inlet 62 are now connected.

[0117] The ejector pin 64 and the ejector ball 124 are both prior art, and their specific structures and working principles are not described in detail here.

[0118] It should be understood that before the injection port 122 is connected to the air inlet 62, the piston mechanism 40 should be in an inhalation state or have completed an inhalation cycle. When the injection port 122 and the air inlet 62 are connected, the piston mechanism 40 should be in an exhaust state to force a fixed amount of sample gas into the sample container 60 through the injection port 122 and the air inlet 62.

[0119] In this embodiment, the automatic sampling device is provided with a sample rack 110 capable of accommodating multiple sample containers 60, an injection nozzle 120, and a sliding mechanism 130, so that the automatic sampling device can automatically perform multiple samplings (for example, sampling can be set every two hours). This reduces human intervention and improves the user experience.

[0120] In some embodiments of the present invention, Figure 12-13 As shown, the injection nozzle 120 is axially slidably connected to the first end 56a of the injection tube. The rear end of the injection nozzle 120 is abutted against a spring (not shown in the figure).

[0121] In this embodiment, the spring pushes the injection nozzle 120 to move outward, causing the injection port 122 to always contact the sample container 60, so that the injection port 122 is inserted into the air inlet 62 when it contacts the air inlet 62, and slides out of the air inlet 62 along the inner wall of the air inlet 62 after completing the injection of the sample gas.

[0122] In some embodiments of the present invention, Figure 7 As shown, the sliding mechanism 130 includes a fixing seat 132 , a screw rod 134 and a slider 136 .

[0123] The fixing base 132 is fixedly arranged. The sample rack 110 is fixedly connected to the fixing base 132 , and all the sample containers 60 are located on a first straight line 160 .

[0124] The screw rod 134 is rotatably connected to the fixing base 132 along the axial direction, and the screw rod 134 is transmission-connected to the second motor 138. The axis of the screw rod 134 is parallel to the first straight line 160.

[0125] The slider 136 is threadedly connected to the screw rod 134. The machine base 10 is fixedly connected to the slider 136.

[0126] In this embodiment, the base 10 is fixedly connected to the slider 136 , and the second motor 138 drives the screw rod 134 to rotate, thereby driving the slider 136 to move along the first straight line 160 to slide over the air inlet ends of the sample containers 60 in sequence.

[0127] The fixing base 132 may be provided with a connection structure to be fixedly connected to the cabin, such as a wall or a window.

[0128] In some embodiments of the present invention, Figure 3 and Figure 7 As shown, the automatic sampling device further includes a protective cover 140, which is cylindrical with one end open. The bottom of the protective cover 140 is fixedly connected to the fixed base 132. The base 10, the rotating shaft 20, the piston mechanism 40, the conversion mechanism 70, and the injection nozzle 120 are all located within the protective cover 140. The first end 52a of the air inlet pipe is located within the opening of the protective cover 140.

[0129] The sample collection process may be subject to various external interferences, affecting sampling operations and accuracy. The protective cover 140, on the one hand, covers the base 10, rotating shaft 20, piston mechanism 40, conversion mechanism 70, and injection nozzle 120, protecting them from interference and damage. On the other hand, it covers the first end 52a of the intake pipe to prevent solid or liquid contaminants from entering the intake pipe 52 and contaminating the sample gas.

[0130] In some embodiments of the present invention, Figure 3 and Figure 7 As shown, a slide groove 142 is provided on the inner side of the peripheral wall of the protective cover 140. The slide groove 142 is parallel to the axis of the screw rod 134. A protrusion 144 is provided on the machine base 10 and is slidably connected to the slide groove 142.

[0131] In this embodiment, the sliding groove 142 is parallel to the first straight line 160 to limit the sliding direction of the machine base 10 and improve the sliding accuracy of the injection nozzle 120 so that the injection port 122 can be accurately inserted into the air inlet 62 .

[0132] In some embodiments of the present invention, Figure 3 and Figure 7 As shown, a mounting groove 146 is provided on the peripheral wall of the protective cover 140 , and the mounting groove 146 is parallel to the axis of the screw rod 134 . The mounting groove 146 forms the sample holder 110 .

[0133] In this embodiment, the protective cover 140 forms the sample rack 110, eliminating the need for an additional sample rack 110. When preparing the sample containers 60, each sample container 60 is inserted and installed in the installation slot 146 in sequence.

[0134] Because the gas inlet end of the sample container 60 faces the injection nozzle 120, when the sample container 60 is installed in the installation groove 146, the gas inlet end of the sample container 60 will be located in the protective cover 140. In other words, the protective cover 140 can also cover the gas inlet end of the sample container 60, preventing fixed or liquid contaminants from falling into the gas inlet 62 and contaminating the sample gas.

[0135] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A small flow indoor ambient air automatic sampling device, characterized in that: include: base; a rotating shaft, the rotating shaft being axially rotatably connected to the machine base, and the rotating shaft being transmission-connected to a first motor; A piston mechanism, comprising a cylinder and a piston; an air intake pipe, wherein a first end of the air intake pipe is used for communicating with ambient air; a connecting pipe, a first end of which is connected to the cylinder; an injection tube, wherein a first end of the injection tube is used for communicating with a sample container; The conversion mechanism includes a conversion body and a connecting cavity formed in the conversion body, the conversion body is provided with a first air inlet and a first injection hole communicating with the connecting cavity; the second end of the connecting tube is connected with the connecting cavity; The rotating shaft is configured to: Driving the piston to reciprocate in the cylinder to form an intake state and an exhaust state; and driving the conversion body so that, when the piston mechanism is in the air intake state, the second end of the air intake pipe is connected to the first air intake hole, and the second end of the injection pipe is cut off from the first injection hole; as well as The conversion body is driven to cut off the second end of the air intake pipe from the first air intake hole and connect the second end of the injection tube to the first injection hole when the piston mechanism is in the exhaust state.

2. The automatic ambient air sampling device according to claim 1, characterized in that: The rotating shaft drives the piston to reciprocate in the cylinder through a cam mechanism, and the cam mechanism includes: a cam, the cam being coaxially fixedly connected to the rotating shaft; and A push rod is slidably connected to the machine base along the axial direction of the cylinder, and the push rod is configured so that one end contacts the cam and the other end is fixedly connected to the piston.

3. The automatic ambient air sampling device according to claim 2, characterized in that: The conversion mechanism further includes a conversion cover, which is fixedly connected to the machine base; The conversion body is cylindrical and coaxially fixedly connected to the rotating shaft; the first air inlet and the first injection hole are both arc-shaped holes coaxial with the rotating shaft; The conversion housing sealing cover is arranged on the outer side of the conversion body; the conversion housing is provided with a second air inlet hole corresponding to the first air inlet hole and a second injection hole corresponding to the first injection hole; the second air inlet hole is connected to the second end of the air inlet pipe, or the second air inlet hole forms the air inlet pipe; The second injection hole is connected to the second end of the injection tube; When the push rod is in the pushing stroke, the first air inlet hole and the second air inlet hole are blocked, and the first injection hole and the second injection hole are connected; when the push rod is in the returning stroke, the first air inlet hole and the second air inlet hole are connected, and the first injection hole and the second injection hole are blocked.

4. The automatic ambient air sampling device according to claim 3, characterized in that: The conversion housing is in a cylindrical shape with one end open, the peripheral wall of the conversion housing is in sealing contact with the peripheral wall of the conversion body, and the bottom wall of the conversion housing is in sealing contact with the bottom wall of the end of the conversion body away from the cam; The first injection hole is located on the peripheral wall of the conversion body, and the second injection hole is located on the peripheral wall of the conversion cover; The first air inlet hole is located on the bottom wall of the conversion body at one end away from the cam, and the second air inlet hole is located on the bottom wall of the conversion cover.

5. The automatic ambient air sampling device according to claim 4, characterized in that: A first connecting hole communicating with the connecting cavity is further provided on the peripheral wall of the conversion body. The first connecting hole is an arc-shaped hole coaxial with the rotating shaft and is provided in two circumferentially spaced intervals. A second connecting hole corresponding to the first connecting hole is further provided on the peripheral wall of the conversion housing, and the second connecting hole is connected to the second end of the connecting pipe; When the push rod is in the pushing stroke, the second connecting hole is cut off from the first first connecting hole and is connected to the second first connecting hole; when the push rod is in the returning stroke, the second connecting hole is connected to the first first connecting hole and is cut off from the second first connecting hole.

6. The automatic ambient air sampling device according to claim 1, characterized in that: The automatic ambient air sampling device also includes: A sample rack, wherein a plurality of sample containers are mounted on the sample rack, wherein the air inlet ends of all the sample containers are located on a first plane; the air inlet end of each sample container is provided with a conical air inlet and a ejector pin located in the air inlet, wherein the ejector pin is configured to open the air inlet when squeezed; an injection nozzle, wherein the rear end of the injection nozzle is connected to the first end of the injection tube, and the front end of the injection nozzle abuts against the air inlet end of at least one of the sample containers; the front end of the injection nozzle is provided with a conical injection port and a top ball located at the injection port, and the top ball is configured to open the injection port when squeezed; A sliding mechanism is configured to cause the injection nozzle and the sample container to slide relative to each other along the first plane, so that the injection nozzle injects gas into all the sample containers in sequence.

7. The automatic ambient air sampling device according to claim 6, characterized in that: The injection nozzle is axially slidably connected to the first end of the injection tube; the rear end of the injection nozzle is abutted against and connected with a spring.

8. The automatic ambient air sampling device according to claim 6, characterized in that: The sliding mechanism comprises: A fixing seat, the fixing seat is fixedly arranged; the sample rack is fixedly connected to the fixing seat, and all the sample containers are located on a first straight line; A screw rod, the screw rod is axially rotatably connected to the fixing seat, the screw rod is transmission-connected to a second motor; the axis of the screw rod is parallel to the first straight line; The slider is threadedly connected to the screw rod; the machine base is fixedly connected to the slider.

9. The automatic ambient air sampling device according to claim 8, characterized in that: The automatic ambient air sampling device also includes: The protective cover is in the shape of a cylinder with one end open, and the bottom of the protective cover is fixedly connected to the fixed base; the machine base, the rotating shaft, the piston mechanism, the conversion mechanism and the injection nozzle are all located in the protective cover; the first end of the air inlet pipe is located in the opening of the protective cover.

10. The automatic ambient air sampling device according to claim 9, characterized in that: A slide groove is provided on the inner side of the peripheral wall of the protective cover, and the slide groove is parallel to the axis of the screw rod; a protrusion is provided on the machine base and is slidably connected to the slide groove; The peripheral wall of the protective cover is provided with a mounting groove, and the mounting groove is parallel to the axis of the screw rod; the mounting groove forms the sample rack.

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