Gas continuous sampling device

Abstract

The utility model discloses a continuous gas sampling device, which adopts an electromagnet to drive a spline pipe to move and a grooved wheel mechanism to drive the spline pipe to rotate, so that a gas supply plug can be driven to axially move and circumferentially rotate relative to a sampling module, and when the gas supply plug circumferentially rotates, exhaust passages of the gas supply plug can correspond to a plurality of gas box units one by one; therefore, air can be supplied to each air box unit through the exhaust passage so as to realize repeated and continuous sampling. After the gas supply plug moves away from the sampling module, residual gas in the whole gas channel can be discharged; then the gas supply plug moves towards the sampling module to enable the exhaust passage to be hermetically communicated with the corresponding gas box unit, and then the sampling gas is input into the corresponding gas box unit to be stored to complete sampling, so that the pollution of the residual gas in the gas passage to the subsequent sampling sample can be greatly reduced, and the reliability of the sampling sample is ensured. And the elastic air bag is adopted in the air box unit to store air, so that the sample can be prevented from being polluted or diluted, and the use is very convenient.

Description

Technical Field

[0001] The utility model relates to gas sampling equipment, in particular to a gas continuous sampling device. Background Art

[0002] Existing gas sampling equipment generally can only sample once. Although there are also those that can sample multiple times, the gas will remain in the sampling pipeline, resulting in sample contamination. There is also a technology for preventing sample contamination, which is to use several integral sampling units, each with an independent pipeline, but this is costly and has a complex structure.

[0003] Therefore, how to achieve multiple and continuous sampling and ensure that the sample is not contaminated is a technical problem that urgently needs to be solved at present. Summary of the Utility Model

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a gas continuous sampling device that can achieve multiple samplings, and the gas remaining from the previous sampling hardly contaminates the sample of the next sampling.

[0005] To achieve the above object, the utility model provides a gas continuous sampling device, which includes a housing, a sampling module, a spline tube, a motor, and an air pump. The sampling module, spline tube, motor, and air pump are all installed in the housing. A plurality of gas box units are installed on the sampling module, and valve seat holes are provided on the gas box units. The valve seat holes are directly or indirectly communicated with an airbag in the gas box unit, and the airbag is used for storing sampling gas;

[0006] The inside of the spline tube is a hollow spline tube hole. The air inlet of the air pump is communicated with the target gas, and the air outlet is directly or indirectly communicated with the spline tube hole. A spline sleeve is sleeved on the spline tube in a non-rotatable relative to the circumference and axially slidable manner. The spline sleeve is arranged on a sprocket wheel, and the sprocket wheel is driven to rotate by a dial. The dial is installed on the motor shaft of the motor, and the motor is installed in the housing;

[0007] The spline tube is fixedly assembled with a gas supply plug. An exhaust passage is provided on the gas supply plug, and the exhaust passage is directly or indirectly communicated with the spline tube hole. When the gas supply plug presses against the gas box unit, the exhaust passage is tightly sealed with the corresponding valve seat hole. Each time the dial drives the sprocket wheel to rotate once, it drives the gas supply plug to rotate synchronously, so that the exhaust passage rotates to face the next valve seat hole;

[0008] A magnet ring is also fixedly sleeved on the spline tube. An electromagnet is sleeved outside the magnet ring. The electromagnet generates a magnetic field to drive the magnet ring to move, so as to drive the gas supply plug to move synchronously through the spline tube axis. After the gas supply plug moves away from the gas box unit, the exhaust passage is separated from the corresponding valve seat hole and is not sealed. At this time, the residual air flow in the air pump, spline tube hole to the exhaust passage can be discharged.

[0009] As a further improvement of the present invention, the housing includes a first side shell and a second side shell, the inner side of the first side shell is respectively assembled and fixed with the first partition, the second partition, the third partition, the fourth partition, and the fifth partition, and the first side shell and the second side shell are assembled and fixed;

[0010] The top of the spline tube passes through the first baffle, the groove wheel, the spline sleeve, the sealing spring, the third baffle, and the electromagnet in sequence from bottom to top, and is then sealed and assembled with the air supply mounting hole of the air supply plug; a push ring is provided on the spline tube, one end of the sealing spring is pressed against the push ring, and the other end is directly or indirectly pressed against the second baffle; the spline sleeve passes through the second baffle and can rotate relative to the second baffle in a circular manner, but cannot move relative to the axial direction;

[0011] The groove wheel is provided with a plurality of matching arc grooves and grooves, and the matching arc grooves and grooves are arranged in a circular array at equal angles in sequence on the groove wheel, and the center of the circular array coincides with the axis of the groove wheel;

[0012] One of the matching arc grooves fits the arc block of the dial and can be assembled in a relative circular rotation. The dial is provided with a dial shaft, which can be inserted into the groove and slidably assembled with it; the dial set is fixed on the motor shaft, one end of the motor shaft passes through the first partition and is installed in the motor, and the motor is installed on the first partition.

[0013] As a further improvement of the utility model, the housing further comprises a bottom cover, the bottom cover is fixedly assembled with the first partition, a pipe rack is mounted on the bottom cover, the pipe rack is fixedly assembled with the sliding pipe, one end of the sliding pipe is inserted into the spline pipe hole of the spline pipe and is sealed and slidably assembled therewith;

[0014] The other end of the sliding pipe is connected to the exhaust port of the air pump through a connecting pipe, the air inlet of the air pump is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the target gas.

[0015] As a further improvement of the utility model, a sealing ring is installed on one end of the sliding tube inserted into the spline tube hole, and the sealing ring is squeezed between the inner wall of the spline tube hole and the sliding tube to achieve sealing, and the sealing is maintained by the sealing ring when the spline tube slides relative to the sliding tube.

[0016] As a further improvement of the utility model, the spline sleeve is assembled with the thrust bearing after passing through the second partition plate, the thrust bearing is pressed tightly with one end of the sealing spring, and the other end of the sealing spring is pressed tightly with the push ring.

[0017] As a further improvement of the utility model, a magnet ring is fixedly mounted on the part of the spline tube located inside the electromagnet, the magnet ring is magnetic, the electromagnet is mounted on the third partition plate and a coil is mounted inside the electromagnet, and a magnetic field is generated when the coil is energized.

[0018] As a further improvement of the present utility model, the air box unit includes an air box, an airbag, an upper valve seat, a lower valve seat, and a sealing plug. The inside of the air box is a hollow air box cavity. A plurality of through air box holes are provided at one end of the air box, and the air box holes are used to discharge the air flow in the air box cavity. The airbag is elastic and its inside is a hollow airbag cavity. An airbag joint is provided on the airbag. The airbag joint is inserted into the upper valve seat and its end face is pressed against the valve seat ring. The airbag joint is assembled and fixed with the upper valve seat and sealed. The valve seat ring is arranged inside the upper valve seat, and a through ring hole is provided on the valve seat ring. The ring hole communicates with the inside of the airbag joint.

[0019] A valve seat cavity and a valve seat hole that are sequentially communicated and penetrate through the lower valve seat are provided inside the lower valve seat. The connection between the valve seat cavity and the valve seat hole is a sealing surface. A plurality of air passing grooves arranged along its axial direction are provided on the inner wall of the valve seat cavity. The sealing plug is snap-fitted and slidably installed in the valve seat cavity. A sealing piece is provided at one end of the sealing plug facing the sealing surface.

[0020] The upper valve seat and the lower valve seat are assembled and fixed. A valve spring is installed between the valve seat ring and the sealing plug. The valve spring applies an elastic force to press the sealing plug against the sealing surface, so that the sealing piece is pressed against and sealed with the sealing surface in the initial state. The airbag is elastic.

[0021] As a further improvement of the present utility model, the sampling module includes a first sampling shell, a second sampling shell, and an air box unit. A positioning shaft and a positioning sleeve are respectively provided on the first sampling shell and the second sampling shell. The positioning shaft is inserted into the positioning sleeve to assemble the first sampling shell and the second sampling shell into one body.

[0022] The air box is assembled and fixed with the second sampling shell. One end of the lower valve seat passes through the first sampling shell and its end face can be pressed against and sealed with the sealing gasket.

[0023] As a further improvement of the present utility model, a side air passage and an exhaust passage are further provided on the air supply plug. The two ends of the side air passage are respectively communicated with the exhaust passage and the air supply installation hole. A sealing gasket is installed on the air supply plug at the end of the exhaust passage far from the side air passage. A through sealing gasket hole is provided inside the sealing gasket. The sealing gasket hole communicates with the exhaust passage.

[0024] As a further improvement of the present utility model, the outer shell further includes a top cover. A lifting column is installed on the second sampling shell. A plurality of top cover protrusions are provided on the top cover. A top cover notch is formed between two top cover protrusions. Through side shell notches are provided at the corresponding positions of the first side shell and the second side shell and the top cover notch. The top cover protrusions are tightly clamped and inserted into the first side shell and the second side shell, and the top cover is pressed against the lifting column.

[0025] The beneficial effects of the present utility model are:

[0026] The utility model uses an electromagnet to drive the spline tube to move, and the Geneva mechanism drives the spline tube to rotate, so that the air supply plug can be driven to axially move and circumferentially rotate relative to the sampling module. When the air supply plug rotates circumferentially, its exhaust passage can be made to correspond to multiple air box units one by one, so that each air box unit can be supplied with gas through the exhaust passage to achieve multiple and continuous samplings. After the air supply plug moves away from the sampling module, the residual gas in the entire air passage can be discharged; then the air supply plug moves towards the sampling module to make its exhaust passage in sealed communication with the corresponding air box unit, and then the sampled gas is input into the corresponding air box unit for storage to complete the sampling. This method can greatly reduce the pollution of the residual gas in the air passage to the subsequent sampled samples and ensure the reliability of the sampled samples. The inside of the air box unit uses an elastic airbag to store gas. This method can first reduce the amount of gas inside the airbag cavity in advance, avoid contaminating or diluting the sample, and at the same time, when exhausting the gas, only the sealing plug needs to be pushed open, and then the airbag contracts by its own elastic force to extrude the sampled gas, which is very convenient to use.

[0027] At the same time, the utility model uses a Geneva mechanism to realize the one-to-one correspondence between the exhaust passage and multiple air box units. This method does not require a position detection design because the rotation angle of the Geneva mechanism is constant. Therefore, the structure of the entire device is simple and the cost is naturally low. After adding corresponding sensors, it is possible to judge whether sampling is performed based on the data detected by the sensors, so as to realize automatic sampling and unmanned operation, further facilitating sampling and improving the monitoring accuracy of the target gas and the timeliness of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figures 1 - 2 is a schematic structural diagram of the utility model;

[0029] Figure 3 is a cross-sectional view of the utility model at the central plane where the axis of the spline tube 610 is located;

[0030] Figure 4 is Figure 3 the enlarged view at A in

[0031] Figure 5 is a cross-sectional view of the utility model at another central plane where the axis of the spline tube 610 is located;

[0032] Figure 6 is an exploded view of some parts of the utility model;

[0033] Figures 7 - 10 is a schematic structural diagram of the utility model after removing the bottom cover 110, the first side shell 121, the second side shell 122, and the top cover 150;

[0034] Figure 11 is a schematic structural diagram of the utility model at the Geneva wheel 530 and the dial 540;

[0035] Figure 12 It is a schematic structural diagram of the Geneva wheel 530 and the dial 540;

[0036] Figure 13 It is a schematic structural diagram of the sampling module, the air supply plug 310, and the spline tube 610;

[0037] Figures 14 - 15 It is an exploded view of some parts at the sampling module;

[0038] Figures 16 - 17 It is an exploded view of the parts at the air box unit. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0040] See Figures 1 - 11 , the gas continuous sampling device of this embodiment includes a housing, a sampling module, a spline tube 610, a motor 210, and an air pump 230. The sampling module, the spline tube 610, the motor 210, and the air pump 230 are all installed in the housing. The housing includes a bottom cover 110, a first side shell 121, a second side shell 122, and a top cover 150. The inner side of the first side shell 121 is respectively assembled and fixed with a first partition 141, a second partition 142, a third partition 143, a fourth partition 144, and a fifth partition 145. The bottom cover 110 is assembled and fixed with the first partition 141. A pipe rack 111 is installed on the bottom cover 110. The pipe rack 111 is assembled and fixed with a sliding tube 620. One end of the sliding tube 620 is inserted into the spline tube hole 611 of the spline tube 610 and is hermetically and slidably assembled therewith. Specifically, a sealing ring 710 is installed at one end of the sliding tube 620 inserted into the spline tube hole 611. The inner wall of the spline tube hole 611 and the sliding tube 620 squeeze the sealing ring 710 to achieve sealing, and when the spline tube 610 slides relative to the sliding tube 620, the sealing can be maintained through the sealing ring 710.

[0041] The other end of the sliding tube 620 is communicated with the exhaust port of the air pump 230 through a connecting tube 630. The intake port of the air pump 230 is communicated with one end of an intake pipe 640. The other end of the intake pipe 640 passes through the bottom cover 110 and is communicated with the target gas. After the air pump 230 is started, the target gas is pumped from the intake pipe 640 to the connecting tube 630, and then transported to the sliding tube 620 and the spline tube 610. The connecting tube 630 can be a flexible tube, and the sliding tube 620 and the spline tube 610 are rigid tubes.

[0042] See Figure 5The top of the spline tube 610 passes through the first baffle 141, the groove wheel 530, the spline sleeve 520, the sealing spring 410, the third baffle 143, and the electromagnet 220 from bottom to top, and is sealed and assembled with the air supply installation hole 311 of the air supply plug 310; the spline sleeve 520 is arranged on the groove wheel 530, and the spline sleeve 520 passes through the second baffle 142 and is assembled and fixed with the shaft ring of the thrust bearing, the seat ring of the thrust bearing 510 is pressed against one end of the sealing spring 410, and the other end of the sealing spring 410 is pressed against the push ring 612, and the push ring 612 is installed on the spline tube 610. The sealing spring 410 applies an elastic force to the push ring 612 to push the electromagnet 220 to keep the air supply plug 310 pressed against the sampling module in the initial state. The splines on the inner side of the spline sleeve 520 are engaged with the spline grooves on the outer wall of the spline tube 610 and slidably assembled, so that the spline tube 610 can slide axially relative to the spline sleeve 520 but cannot rotate circumferentially relative to the spline sleeve 520. The introduction of the thrust bearing 510 is mainly to prevent the sealing spring 410 from twisting in the circumferential direction when the spline tube 610 drives the push ring 612 to rotate, causing damage to the sealing spring 410. After adding the thrust bearing 510, the sealing spring 410 rotates through the thrust shaft teeth 510 without affecting the thrust applied by the sealing spring 410 to the push ring 612.

[0043] See also Figures 11 - 12 The spline sleeve 520 passes through one end of the second partition plate 142 and is assembled with the shaft clamp so that the spline sleeve 520 and the second partition plate 142 can be assembled in a circumferentially rotatable manner but cannot be axially moved. The groove wheel 530 is provided with a plurality of matching arc grooves 531 and grooves 532, which are arranged in a circumferential array at equal angles on the groove wheel, and the center of the circumferential array coincides with the axis of the groove wheel.

[0044] One of the matching arc grooves 531 fits with the arc block 541 of the dial 540 and can be assembled with relative circumference rotation. The dial 540 is provided with a toggle shaft 542, which can be inserted into the groove 532 and slidably assembled therewith. The dial 540 is fixedly mounted on the motor shaft 211, and one end of the motor shaft 211 passes through the first partition plate 141 and is installed in the motor 210, and the motor 210 is installed on the first partition plate 141. After the motor 210 is started, it can drive the dial 540 to rotate, thereby driving the groove wheel 530 to rotate at the same angle, and the groove wheel 530 drives the air supply plug 310 to rotate synchronously through the spline tube 610.

[0045] A magnet ring 320 is fixedly sleeved on the part of the spline tube 610 located inside the electromagnet 220. The magnet ring 320 has magnetism. The electromagnet 220 is installed on the third partition plate 143, and a coil 221 is installed inside the electromagnet 220. After the coil 221 is powered on, a magnetic field is generated, and this magnetic field can drive the magnet ring 320 (the spline tube 610 moves). In this embodiment, after the coil 221 is powered on, it drives the magnet ring 320 to move towards the push ring 612, thereby driving the push ring 612 to squeeze the sealing spring 410 and move downward ( Figure 5 for accuracy). At this time, the end face of the air supply plug 310 is separated from the end face of the sampling module, and the air flow can pass through the air supply plug 310 to exhaust the residual gas in the pipeline.

[0046] In some embodiments, an electrical box 180 is further installed on the third partition plate 143. Some electrical components, batteries, etc. can be installed inside the electrical box. For example, a controller and a battery are installed. The controller is used to receive signals from the motor driver, the electromagnet driver, and the motor driver of the air pump and can send instructions to them. The receiving motor driver, the electromagnet driver, and the motor driver of the air pump are respectively used to drive the motors of the motor, the electromagnet, and the air pump. This is the prior art. Specifically, the technical solutions of controlling the motor and the electromagnet through a controller such as an industrial personal computer, a PLC, or an MCU in the prior art can be directly adopted. The battery is used to supply power to each electrical device.

[0047] An exhaust cavity 103 is formed between the fourth partition plate 144 and the fifth partition plate 145. Exhaust holes 102 are respectively provided at the corresponding positions of the first side shell 121 and the second side shell 122 and the exhaust cavity 103. The exhaust holes 102 are used to lead the gas in the exhaust cavity 103 out of the housing.

[0048] See Figures 1 - 10 , a side air duct 312 and an exhaust air duct 313 are further provided on the air supply plug 310. The two ends of the side air duct 312 are respectively communicated with the exhaust air duct 313 and the air supply installation hole 311. A sealing gasket 720 is installed on the air supply plug 310 at the end of the exhaust air duct 313 far from the side air duct 312. A through sealing gasket hole 721 is provided inside the sealing gasket 720, and the sealing gasket hole 721 is communicated with the exhaust air duct 313.

[0049] See Figures 3 - 17 , the sampling module includes a first sampling shell 160, a second sampling shell 170, and an air box unit. Positioning shafts 161 and positioning sleeves 171 are respectively provided on the first sampling shell 160 and the second sampling shell 170. The positioning shaft 161 is inserted into the positioning sleeve 171 to assemble the first sampling shell 160 and the second sampling shell 170 into one body.

[0050] The air box unit includes an air box 810, an airbag 820, an upper valve seat 830, a lower valve seat 840, and a sealing plug 850. The interior of the air box 810 is a hollow air box cavity 811. At one end of the air box 810, there are several through air box holes 812, which are used to discharge the air flow in the air box cavity 811. The airbag 820 is elastic and its interior is a hollow airbag cavity 821. An airbag joint 822 is provided on the airbag 820. The airbag joint 822 is inserted into the upper valve seat 830 and its end face is pressed against the valve seat ring 831. The airbag joint 822 is assembled, fixed, and sealed with the upper valve seat 830. The valve seat ring 831 is arranged inside the upper valve seat 830, and a through ring hole 832 is provided on the valve seat ring 831. The ring hole 832 communicates with the inside of the airbag joint 822.

[0051] Inside the lower valve seat 840, there are a valve seat cavity 842 and a valve seat hole 841 that are sequentially connected and penetrate through the lower valve seat 840. The connection between the valve seat cavity 842 and the valve seat hole 841 is a sealing surface 844. On the inner wall of the valve seat cavity 842, there are multiple air passing grooves 843 arranged along its axial direction. The sealing plug 850 is snap-fitted and slidably installed in the valve seat cavity 842. A sealing piece 851 is provided at one end of the sealing plug 850 facing the sealing surface 844. The upper valve seat 830 is assembled and fixed with the lower valve seat 840. A valve spring 420 is installed between the valve seat ring 831 and the sealing plug 850. The valve spring 420 applies an elastic force to press the sealing plug 850 against the sealing surface 844, so that in the initial state, the sealing piece 851 is pressed and sealed with the sealing surface 844, thereby cutting off the valve seat cavity 842 and the valve seat hole 841.

[0052] The airbag 820 is elastic. In the initial state, the airbag 820 contracts by its own elastic force so that the airbag cavity 821 inside it is almost non-existent, which can reduce the influence of the original gas in the airbag on the sampled gas.

[0053] The air box 810 is assembled and fixed with the second sampling shell 170. One end of the lower valve seat 840 passes through the first sampling shell 160 and its end face can be pressed and sealed with the sealing gasket 720, so that the exhaust passage 313 is sealed and communicated with the valve seat hole 841.

[0054] In some embodiments, a lifting column 172 is installed on the second sampling shell 170. During use, the entire sampling module can be taken out of the housing by holding the lifting column 172.

[0055] In some embodiments, a plurality of top cover protrusions 151 are provided on the top cover 150. A top cover notch 152 is formed between two top cover protrusions 151. At the positions corresponding to the top cover notch 152 on the first side shell 121 and the second side shell 122, there are through side shell notches 101. The top cover protrusions 151 are tightly fitted into the first side shell 121 and the second side shell 122, and the top cover 150 is pressed against the lifting column 172. This design mainly forms an obstruction at the air box hole 812 to prevent foreign objects from entering the air box cavity 811, and at the same time ensures that the gas in the air box cavity 811 can be discharged.

[0056] In some embodiments, a detection box 140 is further installed on the second side shell 122. Inside the detection box 140, sensors for detecting gas parameters are installed, such as a PM2.5 sensor, a PM10 sensor, a carbon monoxide sensor, a NOx sensor, etc. The signals of these sensors are connected to a controller. During use, these sensors detect the relevant parameters of the target gas. Once it is found that the parameters reach the preset threshold, the air pump is started to pump the gas into the airbag of one of the air box units for storage, thereby completing the sampling. This part of the technical solution is the same as that of the prior art sampling device with gas parameter detection, and corresponding technical solutions can be specifically adopted.

[0057] The operation process of this embodiment is as follows:

[0058] S1. Install the present utility model and connect the air inlet of the sensor in the detection box 140 to the target gas, such as air.

[0059] S2. The sensor detects the corresponding parameters of the target gas. Once the parameters reach the preset threshold, the air pump is started to pump the target gas into the spline tube hole 161. After the air flow enters the spline tube hole 161, it is output to the valve seat hole 841 through the air supply installation hole 311, the side air duct 312, and the exhaust air duct 313. Then, as the air pressure increases, the air pressure pushes the sealing plug 850 to move towards the valve seat ring 831 against the elastic force of the valve spring 420, so that the sealing state between the sealing piece 851 and the sealing surface 844 is released, and the air flow enters the valve seat cavity 842. Then, it bypasses the sealing plug 850 through the air passing groove 843 and enters the airbag cavity 821 through the ring hole 832. As the air flow enters, the airbag 820 expands until the air pump stops running after reaching the corresponding operation duration. After the air pump stops, the air pressure on the exhaust air duct 313 side drops, and the valve spring 420 drives the sealing piece 851 to move downward and then resumes pressing and sealing with the sealing surface 844.

[0060] S3. During the second sampling, the coil 221 is energized to generate a magnetic field, which drives the spline tube 610 to carry the air supply plug 310 to move away from the sampling module. The motor is started, and the motor drives the air supply plug 310 to rotate so that the gasket 720 rotates to face the next valve seat 840. The air pump is started, and the air pump pumps the air flow to the gasket 720 and blows it out from the gasket hole 721, and maintains for a certain period of time, such as 3 seconds, so as to blow out the residual gas in the pipeline. At the same time, the blown air flow also blows away the gas remaining in the valve seat cavity 842. Then the coil 221 is de-energized, and the sealing spring 410 pushes the spline tube 610 to carry the air supply plug 310 to move upward so that the facing gasket 720 and valve seat 840 are pressed and sealed. During this process, the air pump keeps running and inputs the gas into the airbag 820 for storage until the air pump stops after reaching the preset running time, and the corresponding sealing piece 851 resumes sealing, completing the sampling.

[0061] S4. Repeat the steps of S2 - S3 until all airbags have completed sampling.

[0062] S5. Open the top cover 150, pull out the sampling module, and replace it with a new sampling module in time, or draw out the sampled gas stored in the airbag and then reinstall the sampling module. It is very simple and convenient to use.

[0063] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meanings understood by those skilled in the art to which this application belongs.

[0064] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0065] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of this application, "a plurality of" means more than two unless otherwise clearly and specifically defined.

[0066] In this application, the circumferentially rotatable assembly means a connection assembly that can rotate relative to each other, such as an assembly through a bearing; the circumferentially rotatable and axially non-movable assembly means an assembly that can rotate relative to each other but cannot move axially, such as installing shaft collars on both sides of the shaft and the mounting device to prevent the shaft from moving axially; the circumferentially rotatable and axially movable assembly is a movable assembly, such as an assembly where a shaft passes through a shaft hole; the non-circumferentially rotatable and axially movable assembly can be an assembly using a spline groove and spline fit.

[0067] In this application, unless otherwise clearly defined and limited, terms such as "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0069] As described above, it is only a preferred specific embodiment of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A continuous gas sampling device, characterized in that: It includes a housing, a sampling module, a spline tube, a motor, and an air pump. The sampling module, the spline tube, the motor, and the air pump are all installed in the housing. A plurality of gas box units are installed on the sampling module. The gas box unit is provided with a valve seat hole. The valve seat hole is directly or indirectly connected to an air bag in the gas box unit. The air bag is used to store the sampling gas. The interior of the spline tube is a hollow spline tube hole, the air inlet of the air pump is connected to the target gas, and the exhaust port is directly or indirectly connected to the spline tube hole; a spline sleeve is mounted on the spline tube so as to be non-rotatable relative to the circumference but axially slidable, the spline sleeve is arranged on the groove wheel, the groove wheel is driven to rotate by a dial, the dial is mounted on the motor shaft of the motor, and the motor is mounted in the housing; The spline tube is fixedly assembled with the air supply plug, and an exhaust passage is arranged on the air supply plug, and the exhaust passage is directly or indirectly connected with the spline tube hole; when the air supply plug is pressed against the air box unit, the exhaust passage is pressed and sealed with the corresponding valve seat hole; each time the dial drives the groove wheel to rotate once, the air supply plug is driven to rotate synchronously, so that the exhaust passage rotates to face the next valve seat hole; The spline tube is also equipped with a magnet ring, and an electromagnet is installed outside the magnet ring. The electromagnet generates a magnetic field to drive the magnet ring to move, so as to drive the air supply plug to move synchronously through the spline tube shaft. After the air supply plug moves away from the air box unit, the exhaust duct is separated from the corresponding valve seat hole and is not sealed. At this time, the residual airflow from the air pump and the spline tube hole to the exhaust duct can be discharged.

2. The gas continuous sampling device according to claim 1, wherein: The outer shell comprises a first side shell and a second side shell, the inner side of the first side shell is respectively assembled and fixed with the first partition plate, the second partition plate, the third partition plate, the fourth partition plate and the fifth partition plate, and the first side shell and the second side shell are assembled and fixed; The top of the spline tube passes through the first baffle, the groove wheel, the spline sleeve, the sealing spring, the third baffle, and the electromagnet in sequence from bottom to top, and is then sealed and assembled with the air supply mounting hole of the air supply plug; a push ring is provided on the spline tube, one end of the sealing spring is pressed against the push ring, and the other end is directly or indirectly pressed against the second baffle; the spline sleeve passes through the second baffle and can rotate relative to the second baffle in a circular manner, but cannot move relative to the axial direction; The groove wheel is provided with a plurality of matching arc grooves and grooves, and the matching arc grooves and grooves are arranged in a circular array at equal angles in sequence on the groove wheel, and the center of the circular array coincides with the axis of the groove wheel; One of the matching arc grooves fits the arc block of the dial and can be assembled in a relative circular rotation. The dial is provided with a dial shaft, which can be inserted into the groove and slidably assembled with it; the dial set is fixed on the motor shaft, one end of the motor shaft passes through the first partition and is installed in the motor, and the motor is installed on the first partition.

3. The gas continuous sampling device according to claim 2, characterized in that: The housing further comprises a bottom cover, the bottom cover is fixedly assembled with the first partition, a pipe rack is mounted on the bottom cover, the pipe rack is fixedly assembled with the sliding pipe, one end of the sliding pipe is inserted into the spline pipe hole of the spline pipe and is sealed and slidably assembled with the spline pipe; The other end of the sliding pipe is connected to the exhaust port of the air pump through a connecting pipe, the air inlet of the air pump is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the target gas.

4. The gas continuous sampling device according to claim 3, characterized in that: A sealing ring is installed on one end of the sliding tube inserted into the spline tube hole. The sealing ring is squeezed between the inner wall of the spline tube hole and the sliding tube to achieve sealing, and the sealing ring maintains sealing when the spline tube slides relative to the sliding tube.

5. The gas continuous sampling device according to claim 2, characterized in that: The spline sleeve is assembled with the thrust bearing after passing through the second partition board. One end of the thrust bearing is pressed against the sealing spring, and the other end of the sealing spring is pressed against the thrust ring.

6. The gas continuous sampling device according to claim 1, wherein: A magnet ring is sleeved and fixed on the part of the spline tube located inside the electromagnet. The magnet ring has magnetism. The electromagnet is installed on the third partition board, and a coil is installed inside the electromagnet. After the coil is energized, a magnetic field is generated.

7. The gas continuous sampling device according to any one of claims 1-6, characterized in that: The air box unit includes an air box, an air bag, an upper valve seat, a lower valve seat, and a sealing plug. The inside of the air box is a hollow air box cavity. Several through air box holes are provided at one end of the air box for discharging the air flow in the air box cavity. The air bag is elastic and its inside is a hollow air bag cavity. An air bag joint is provided on the air bag. The air bag joint is inserted into the upper valve seat and its end face is pressed against the valve seat ring. The air bag joint is assembled and fixed with the upper valve seat and sealed. The valve seat ring is arranged inside the upper valve seat, and a through ring hole is provided on the valve seat ring, and the ring hole is communicated with the inside of the air bag joint. A valve seat cavity and a valve seat hole that are sequentially communicated and penetrate through the lower valve seat are provided inside the lower valve seat. The connection between the valve seat cavity and the valve seat hole is a sealing surface. A plurality of air passing grooves are arranged along the axial direction on the inner wall of the valve seat cavity. The sealing plug is snap-fitted and slidably installed in the valve seat cavity, and a sealing piece is provided at one end of the sealing plug facing the sealing surface. The upper valve seat and the lower valve seat are assembled and fixed. A valve spring is installed between the valve seat ring and the sealing plug. The valve spring applies an elastic force to press the sealing plug against the sealing surface so that the sealing piece is pressed against and sealed with the sealing surface in the initial state. The air bag is elastic.

8. The gas continuous sampling device according to claim 7, characterized in that: The sampling module includes a first sampling shell, a second sampling shell, and an air box unit. A positioning shaft and a positioning sleeve are respectively provided on the first sampling shell and the second sampling shell. The positioning shaft is inserted into the positioning sleeve to assemble the first sampling shell and the second sampling shell into one body. The air box is assembled and fixed with the second sampling shell. One end of the lower valve seat passes through the first sampling shell and its end face can be pressed against the sealing gasket for sealing.

9. The gas continuous sampling device according to claim 7, characterized in that: A side air passage and an exhaust passage are further provided on the air supply plug. The two ends of the side air passage are respectively communicated with the exhaust passage and the air supply installation hole. A sealing gasket is installed on the air supply plug at the end of the exhaust passage far from the side air passage. A through sealing gasket hole is provided inside the sealing gasket, and the sealing gasket hole is communicated with the exhaust passage.

10. The gas continuous sampling device according to claim 7, characterized in that: the outer shell It further includes a top cover. A lifting column is installed on the second sampling shell. A plurality of top cover protrusions are provided on the top cover. A top cover notch is formed between two top cover protrusions. Through side shell notches are provided at the corresponding positions of the first side shell and the second side shell of the outer shell and the top cover notch. The top cover protrusions are tightly clamped and inserted into the first side shell and the second side shell, and the top cover is pressed against the lifting column.

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