Intelligent double-path constant-current sampler for indoor environment

Abstract

The utility model provides an intelligent double-path constant-current sampler for an indoor environment, which relates to the technical field of environment detection and is characterized in that a plurality of groups of acquisition components are respectively communicated with a pump body through corresponding gas paths in an equipment main body; a gas sample is transmitted into the pump body through a mass flow meter and a flow regulating valve in the gas path in sequence, and the mass flow meter and the flow regulating valve are used for controlling the constant flow of the gas sample in the gas path; a throttling element and a flow regulating valve are connected in parallel and then communicate with a pump body, and the throttling element is provided with an air resistance hole; the technical problem that in the prior art, when the flow of the constant-current sampler is controlled by adjusting the voltage change of the pump body, due to the fact that the power change of the pump body has interval performance, the stability and air exhaust pressure of the constant-current sampler at small flow are difficult to meet is solved, and the technical effect of improving the working efficiency is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental detection, in particular to an indoor environment intelligent dual-path constant current sampler. Background Art

[0002] The constant flow sampler is used for constant flow sampling for the determination of formaldehyde, organic compounds (TVOC) and benzene in indoor and workplace air; it is usually used for environmental evaluation and routine monitoring to collect samples of harmful gases such as SO2 and NOX in the air. Referring to GB50325-2020 "Code for Indoor Environmental Pollution Control of Civil Building Engineering" and GB / T18204.2-2014 "Public Place Hygiene Inspection Methods. Part 2: Chemical Pollutants" standards, it is required that the flow rate is stable during the sampling process, the flow rate range should be 0.1~1.0L / min, and the error should not exceed ±5%.

[0003] In the prior art, the flow rate of the constant flow sampler is usually controlled by adjusting the voltage of the pump body or adding a manual flow control valve in the gas circuit. Since the sampling flow rate range needs to meet 0.1-1.0L / min, in order to meet the above standards, both methods need to be adaptively adjusted;

[0004] When the pump voltage is adjusted, the pump needs to work at a very low power when the sampling flow rate is small to meet the requirements of the sampling flow rate and the suction pressure. However, the flow stability of the pump is poor and the suction pressure is low when the pump power is very small, which cannot meet the requirements of the sampling flow rate and the suction pressure.

[0005] When a manual flow control valve is added to the gas circuit to adjust the flow, due to the large flow range, when the flow is small, the air intake at the air inlet of the pump body is very small, which will cause the pump body to make abnormal noises or even heat up violently, thus affecting the service life of the pump body.

[0006] Therefore, the above-mentioned technical problems need to be further solved. Summary of the invention

[0007] The purpose of the embodiment of the utility model is to provide an intelligent dual-channel constant current sampler for indoor environment, so as to alleviate the technical problem existing in the prior art that when adjusting the pump body voltage, when a small flow rate is required for sampling, the flow stability of the pump body is poor and the suction pressure is low at extremely small power, and the requirements of sampling flow and suction pressure cannot be met; when a manual flow regulating valve is added to the air circuit to adjust the flow, due to the large span of the flow range, when the flow rate is small, the air intake volume of the air inlet of the pump body is very small, which will cause the pump body to make abnormal noises or even heat up violently, thereby affecting the service life of the pump body.

[0008] In order to solve the above technical problems, the present utility model provides the following technical solutions:

[0009] The utility model provides a first aspect of an indoor environment intelligent dual-path constant current sampler, comprising a device body and a plurality of collection components, wherein the plurality of collection components are respectively connected to a pump body through corresponding gas paths in the device body; the collection components are used to collect gas samples in the environment;

[0010] The gas circuit includes a flow regulating valve, a mass flow meter and a throttling element, and the gas sample is sequentially transferred to the pump body through the mass flow meter and the flow regulating valve, and the mass flow meter and the flow regulating valve are used to control the constant flow rate of the gas sample in the gas circuit;

[0011] The throttling element and the flow regulating valve are connected in parallel and connected to the pump body, and the connecting point between the air resistance hole and the air path in the throttling element is arranged between the flow regulating valve and the pump body to form a branch connecting the air path with the outside atmosphere.

[0012] In some modified implementations of the first aspect of the utility model, the sampling assembly includes a bubble absorption bottle, an anti-backflow bottle and an absorption bottle bracket, and the anti-backflow bottle is connected between the bubble absorption bottle and the mass flow meter;

[0013] The absorption bottle bracket is detachably connected to the side wall of the equipment body, and the absorption bottle bracket is used for placing the bubble absorption bottle.

[0014] In some modified implementations of the first aspect of the utility model, the device body further includes a box body, a plurality of fixing cylinders and a plurality of threaded columns, the plurality of threaded columns are respectively arranged on both sides of the box body; and the absorption bottle bracket is connected to the box body through the threaded columns;

[0015] A plurality of fixing tubes are arranged on the top of the box body, and the fixing tubes are used for placing the anti-backflow bottles.

[0016] In some modified implementations of the first aspect of the utility model, the device body further includes a control component and a lithium battery, both of which are installed inside the box, and the lithium battery is used to provide power to the control component;

[0017] The flow regulating valve and the mass flow meter are electrically connected to the control component respectively, and the control component is used to adjust the constant flow rate of the gas path according to the feedback of the flow regulating valve and the mass flow meter.

[0018] In some modified implementations of the first aspect of the utility model, the box body includes a front cover, the front cover is provided with a USB interface and a power switch, and the USB interface and the power switch are electrically connected to the control component respectively.

[0019] In some modified implementations of the first aspect of the utility model, the box body further includes a mounting plate, which is arranged on an inner wall of the box body away from the front cover;

[0020] The mounting plate is used for the installation of mass flow meters, flow control valves, throttling elements and pump bodies.

[0021] In some modified implementations of the first aspect of the utility model, a tripod is further included, and a fixing plate is provided at the bottom of the box body, and the tripod is detachably connected to the box body through the fixing plate.

[0022] In some modified implementations of the first aspect of the utility model, four rubber feet are further provided at the bottom of the box body, and the four rubber feet are evenly arranged along the circumference of the fixing plate.

[0023] In some modified implementations of the first aspect of the utility model, a protective box is further included, in which a protective layer is provided, and the protective layer is respectively provided with storage grooves compatible with the equipment body, the absorption bottle bracket, the bubble absorption bottle, the anti-backward suction bottle and the tripod.

[0024] Compared with the prior art, the utility model connects multiple groups of collection components to the pump body through the corresponding gas paths in the main body of the equipment, thereby realizing multi-path sampling and improving work efficiency. The pump body is used to provide suction for the gas path, and in order to ensure that the pump body operates under stable power, a throttling piece and a flow regulating valve are connected to the pump body in parallel in the gas path. In the process of flow regulation, the gas sample flows into the gas path after being collected by the sampling component. The gas path is controlled by the mass flow meter and the flow regulating valve to maintain the flow in the gas path. The flow rate can be stably controlled between 0.1 and 1.0 L / min. The throttling device and the flow regulating valve are connected in parallel to the pump body, and the throttling device is connected to the atmosphere through the air resistance hole and the air path connection point between the flow regulating valve and the pump body to form a branch of the air path. When the flow rate is controlled, the voltage of the pump body can be increased, so that the pump body can work in a stable working range with stable flow and high suction pressure. When the flow regulating valve is used to adjust the flow rate, such as when the flow rate is small, the pump body can be prevented from "pump blocking", thereby achieving the technical effect of improving the working stability and reliability of the pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below.

[0026] Figure 1 A schematic diagram of the overall structure of an indoor environment intelligent dual-channel constant current sampler provided by an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the structure of a throttling device in an indoor environment intelligent dual-channel constant current sampler provided by an embodiment of the utility model;

[0028] Figure 3 A schematic diagram of the external structure of a box in an indoor environment intelligent dual-channel constant current sampler provided by an embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the internal structure of a box in an indoor environment intelligent dual-channel constant current sampler provided by an embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the connection of components of the gas circuit in an indoor environment intelligent dual-channel constant current sampler provided in an embodiment of the utility model.

[0031] Among them: 1-first gas path; 2-second gas path; 3-first collection component; 4-second collection component; 10-pump body; 100-equipment body; 101-first air inlet; 110-gas path; 111-flow control valve; 112-mass flowmeter; 113-throttling device; 114-gas resistance hole; 120-box; 130-fixing cylinder; 140-threaded column; 150-control part; 160-lithium battery; 170-front cover; 171-USB interface; 172-power switch; 180-mounting plate; 190-fixing plate; 200-collection component; 210-bubble absorption bottle; 220-anti-backflow bottle; 230-absorption bottle bracket; 300-tripod; 400-protective box. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] like Figure 1-Figure 5 As shown, the utility model provides an indoor environment intelligent dual-path constant current collector, comprising a device body 100 and a plurality of collection components 200, wherein the plurality of collection components 200 are respectively connected to a pump body 10 through corresponding gas paths 110 in the device body 100; the collection components 200 are used to collect gas samples in the environment;

[0035] The gas circuit 110 includes a flow regulating valve 111, a mass flow meter 112 and a throttle 113. The gas sample is sequentially transmitted to the pump body 10 through the mass flow meter 112 and the flow regulating valve 111. The mass flow meter 112 and the flow regulating valve 111 are used to control the constant flow rate of the gas sample in the gas circuit 110.

[0036] The throttling element 113 and the flow regulating valve 111 are connected in parallel and connected to the pump body 10, and the throttling element 113 forms a branch connecting the air path with the outside atmosphere by arranging the connection between the air resistance hole 114 and the air path between the flow regulating valve 111 and the pump body 10.

[0037] Compared with the prior art, in this embodiment, multiple groups of collection components 200 are connected to the pump body 10 through the corresponding gas paths 110 in the device body 100, respectively, to achieve multi-channel sampling and improve work efficiency. The pump body 10 is used to provide suction for the gas path 110, and in order to ensure that the pump body 10 operates under stable power, the throttling piece 113 and the flow regulating valve 111 are connected in parallel in the gas path 110 and then connected to the pump body 10. In the process of flow regulation, the gas sample flows into the gas path 110 after being collected by the sampling component. The gas path 110 is closed-loop controlled by the mass flow meter 112 and the flow regulating valve 111 to obtain the gas path 110. Internal flow, in order to keep the flow in the air circuit stably controlled between 0.1 and 1.0 L / min, the throttling device and the flow regulating valve are connected in parallel to the pump body 10, and the throttling device is connected to the air circuit through the air resistance hole 114, forming a branch of the air circuit between the flow regulating valve 111 and the pump body 10 and connected to the atmosphere. When the flow is controlled, the voltage of the pump body 10 can be increased, so that the pump body 10 can work in a stable working range with stable flow and high suction pressure; when the flow regulating valve 111 is used to adjust the flow, such as when the flow is small, the pump body can be prevented from "pumping", achieving the technical effect of improving the working stability and reliability of the pump body.

[0038] To further illustrate the working principle of the present embodiment, in the present embodiment, a dual-path constant current sampling mode is adopted, that is, a first gas path 1 and a second gas path 2 are provided in the device body 100, wherein the first gas path 1 is connected to the first collection component 3, and the second gas path 2 is connected to the second sampling component 5, and the first collection component 3 and the second collection component 5 are arranged on both sides of the device body 100 in a relative position, which is convenient for the installation of the equipment and the collection of on-site gas, wherein the first gas path 1 and the second gas path 2 both include a flow regulating valve 111, a mass flow meter 112 and a throttling member 113 which are connected in sequence by air pipes, and the first collection component 3 and the second collection component 4 both include a bubble absorption bottle 210, an anti-backflow valve and an absorption bottle bracket 230 which are connected in sequence by air pipes, and designers can also set a third gas path, a fourth gas path and a third collection component and a fourth collection component matching them and other multi-path settings according to actual needs.

[0039] Furthermore, the collection assembly 200 includes a bubble absorption bottle 210, an anti-backflow bottle 220 and an absorption bottle bracket 230, and the anti-backflow bottle 220 is connected between the bubble absorption bottle 210 and the mass flow meter 112;

[0040] The absorption bottle bracket 230 is detachably connected to the side wall of the equipment body 100 , and the absorption bottle bracket 230 is used to place the bubble absorption bottle 210 .

[0041] Furthermore, the device body 100 further includes a box body 120, a plurality of fixing cylinders 130 and a plurality of threaded columns 140, wherein the plurality of threaded columns 140 are respectively disposed on both sides of the box body 120; and the absorption bottle bracket 230 is connected to the box body 120 through the threaded columns 140;

[0042] A plurality of fixing tubes 130 are disposed on the top of the box body 120 , and the fixing tubes 130 are used to place the anti-backflow bottles 220 .

[0043] A first air inlet 101 is provided at the end of the box body 120 facing the anti-backflow bottle 220. During use, a certain amount of absorption liquid is placed in the bubble absorption bottle 210, and the sampled indoor gas passes through the bubble absorption bottle 210, the anti-backflow bottle 220, and through the air inlet of the equipment main body 100 and the corresponding air path 110 therein, and after the action of the mass flow meter 112, the flow regulating valve 111 and the throttling device 113, enters the second air inlet of the pump body 10, and is finally discharged from the exhaust port of the pump body 10.

[0044] In order to ensure the connection stability of each component in the above process, a plurality of threaded columns 140 are provided on the side wall of the equipment body 100 for hanging or fixing the absorption bottle bracket 230. The bubble absorption bottle 210 is placed in the absorption bottle bracket 230. The absorption bottle bracket 230 is made of stainless steel and a protective ring is installed on the contact part with the bubble absorption bottle 210 to further prevent the bubble absorption bottle 210 from being damaged.

[0045] At the top of the box body 120, a fixed cylinder 130 matching the inverted suction bottle is arranged. To meet the dual-path setting described above, a left fixed cylinder 130 and a right fixed cylinder 130 can be arranged at the top of the box body 120 by threaded connection.

[0046] Furthermore, the device body 100 further includes a control unit 150 and a lithium battery 160, both of which are installed inside the box 120, and the lithium battery 160 is used to provide power to the control unit 150;

[0047] The flow regulating valve 111, the mass flow meter 112 and the valve body are respectively electrically connected to the control component 150, and the flow regulating valve 111, the mass flow meter 112 and the valve body are respectively electrically connected to the control component 150, and the control component 150 is used to adjust the constant flow rate of the gas circuit 110 according to the feedback of the flow regulating valve 111 and the mass flow meter 112.

[0048] In this embodiment, the control component 150 is set up with a multifunctional control device having data processing and display devices, such as the Zhongda Youkong all-in-one machine MM-40MR-12MT-430. Through the setting of its touch screen, the operation of the staff is easier and the test speed is improved. At the same time, the flow control valve 111 and the mass flow meter 112 are respectively electrically connected to the control component 150. The logic setting of the internal circuit of the control component 150 can be used, and quantitative and timing modes can be adopted to realize the feedback of the flow control valve 111 and the mass flow meter to realize the automatic adjustment of the constant flow rate in the gas circuit 110, thereby ensuring the requirements and accuracy of the sampling flow rate.

[0049] It should be noted that, in this embodiment, the mass flow meter 112 adopts FS4003-2-R-BV-A gas flow meter, and the medium is air; the flow control valve 111 adopts a proportional control valve, which uses its characteristics such as fast adjustment speed to cooperate with the mass flow meter 112, and completes closed-loop adjustment of the flow through the control component 150 to ensure constant flow output.

[0050] Furthermore, the box body 120 includes a front cover 170 , and the front cover 170 is provided with a USB interface 171 and a power switch 172 , and the USB interface 171 and the power switch 172 are electrically connected to the control component 150 respectively.

[0051] By setting a USB interface 171 and a power switch 172 on the front cover 170, the USB interface 171 is convenient for the staff to import and export sampling data, and the power switch 172 is used for start and stop control of the equipment; at the same time, the equipment body 100 is also provided with a charging port, which adopts a standard DC socket 5.5 / 2.1 and is placed on the right side of the box 120.

[0052] Furthermore, the box body 120 further includes a mounting plate 180, which is disposed on an inner wall of the box body 120 away from the front cover 170;

[0053] The mounting plate 180 is used for mounting the mass flow meter 112 , the flow regulating valve 111 , the throttling element 113 and the pump body 10 .

[0054] The installation of the mounting plate 180 facilitates the unified layout of the mass flow meter 112 , the flow regulating valve 111 , the throttling element 113 and the pump body 10 .

[0055] Furthermore, a tripod 300 is included. A fixing plate 190 is provided at the bottom of the box body 120 , and the tripod 300 is detachably connected to the box body 120 via the fixing plate 190 .

[0056] The tripod 300 can be set up in the form of a telescopic rod, and through the pin connection with the fixed plate 190 arranged at the bottom of the box 120, it can not only adjust the overall height of the support box 120, but also ensure the stability of the instrument placement, so as to meet the requirements for the selection of measuring points stipulated in the national standard and thus ensure the accuracy of indoor environment monitoring.

[0057] Furthermore, the pump body 10 is a diaphragm pump, and a rubber pad is installed at the bottom of the diaphragm pump to reduce the vibration of the pump body.

[0058] Furthermore, four rubber feet are provided at the bottom of the box body 120 , and the four rubber feet are evenly arranged along the circumference of the fixing plate 190 .

[0059] The overall vibration of the device is reduced by providing the rubber pads, and the four rubber pads are evenly arranged along the circumference of the fixing plate 190, so that the box body 120 is more stable when placed.

[0060] Furthermore, it also includes a protective box 400, in which a protective layer is provided, and the protective layer is respectively provided with storage grooves compatible with the equipment body 100, the absorption bottle bracket 230, the bubble absorption bottle 210, the anti-backward suction bottle 220 and the tripod 300.

[0061] To facilitate the transportation and storage of the entire equipment, the present embodiment also includes a protective box 400. A protective layer made of materials such as EVA may be used in the protective box 400, and the protective layer is provided with storage grooves that are compatible with the equipment body 100, the absorption bottle holder 230, the bubble absorption bottle 210, the anti-backward suction bottle 220 and the tripod 300, so as to facilitate the storage of the above-mentioned equipment in the protective box 400 and prevent bumps during transportation.

[0062] In this embodiment, the equipment body 100 is arranged on the upper part of the tripod 300, and multiple absorption bottle brackets 230 are respectively suspended on the side walls of the box body 120 through threaded columns 140, and multiple bubble absorption bottles 210 are respectively placed on corresponding absorption bottle brackets 230, and multiple anti-backflow bottles 220 are respectively placed in corresponding fixed tubes 130. The bubble absorption bottles 210, anti-backflow bottles 220 and the first air inlet 101 of the equipment body 100 are connected in sequence with air pipes. When collecting, a certain amount of absorption liquid is placed in the bubble absorption bottle 210, and the power switch 172 of the front cover 170 of the box body 120 is used to control the start of the equipment. The control component 150 uses a touch screen all-in-one machine with data processing and display functions to set the sampling mode. The setting is divided into two modes: quantitative and timing, thereby completing the sampling of indoor environmental gases.

[0063] The implementation of this embodiment has the following technical effects:

[0064] (1) The flow rate is stable and the flow range is wide, which can be adjusted from 0.1 to 1.0L / min.

[0065] (2) The flow accuracy and control accuracy are high, and the flow accuracy can be controlled within the range of ±2.5%.

[0066] (3) Two independent sampling channels, touch screen operation, automatic adjustment of set flow, high degree of intelligence and high work efficiency.

[0067] (4) No need to adjust the vacuum pump, the set flow rate can be adjusted to ensure the exhaust pressure.

[0068] (5) The whole machine has a compact structure, small size, light weight, and is easy to carry, making it convenient for users to go out for sampling work.

[0069] (6) The box body 120 is made of exquisite injection-molded box, which is light and beautiful.

[0070] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An indoor environment intelligent dual-channel constant current sampler, characterized in that: The device comprises a device body (100) and a plurality of collection components (200), wherein the plurality of collection components (200) are respectively connected to a pump body (10) through corresponding gas paths (110) in the device body (100); and the collection components (200) are used to collect gas samples in the surrounding environment; The gas circuit (110) comprises a flow regulating valve (111), a mass flow meter (112) and a throttling element (113); the gas sample passes through the mass flow meter (112) and the flow regulating valve (111) in sequence and enters the pump body (10); and the mass flow meter (112) and the flow regulating valve (111) are used to control a constant flow rate of the gas sample in the gas circuit (110); The throttling element (113) and the flow regulating valve (111) are connected in parallel and connected to the pump body (10), and a branch connecting the air path and the outside atmosphere is formed by arranging the connection point between the air resistance hole (114) and the air path in the throttling element (113) between the flow regulating valve (111) and the pump body (10).

2. The intelligent dual-channel constant current sampler for indoor environment according to claim 1, characterized in that: The collection assembly (200) comprises a bubble absorption bottle (210), an anti-backflow bottle (220) and an absorption bottle support (230); the anti-backflow bottle (220) is connected between the bubble absorption bottle (210) and the mass flow meter (112); The absorption bottle support (230) is detachably connected to the side wall of the device body (100), and the absorption bottle support (230) is used to place the bubble absorption bottle (210).

3. The indoor environment intelligent dual-channel constant current sampler according to claim 2, characterized in that: The device body (100) further comprises a box body (120), a plurality of fixing cylinders (130) and a plurality of threaded columns (140), wherein the plurality of threaded columns (140) are respectively arranged on both sides of the box body (120); and the absorption bottle bracket (230) is connected to the box body (120) via the threaded columns (140); A plurality of fixed cylinders (130) are arranged on the top of the box body (120), and the fixed cylinders (130) are used to place the anti-backflow bottles (220).

4. The indoor environment intelligent dual-channel constant current sampler according to claim 3, characterized in that: The device body (100) further comprises a control component (150) and a lithium battery (160), wherein the control component (150) and the lithium battery (160) are both installed inside the box (120), and the lithium battery (160) is used to provide electrical energy for the control component (150); The flow regulating valve (111) and the mass flow meter (112) are respectively electrically connected to the control component (150), and the control component (150) is used to adjust the constant flow rate of the gas circuit (110) according to feedback from the flow regulating valve (111) and the mass flow meter (112).

5. The intelligent dual-channel constant current sampler for indoor environment according to claim 4, characterized in that: The box body (120) comprises a front cover (170), the front cover (170) is provided with a USB interface (171) and a power switch (172), and the USB interface (171) and the power switch (172) are respectively electrically connected to the control component (150).

6. The intelligent dual-channel constant current sampler for indoor environment according to claim 5, characterized in that: The box body (120) further comprises a mounting plate (180), wherein the mounting plate (180) is arranged on an inner wall of the box body (120) away from the front cover (170); The mounting plate (180) is used for mounting a mass flow meter (112), a flow regulating valve (111), a throttling element (113) and a pump body (10).

7. The indoor environment intelligent dual-channel constant current sampler according to claim 3, characterized in that: It also includes a tripod (300), a fixing plate (190) is provided at the bottom of the box body (120), and the tripod (300) is detachably connected to the box body (120) via the fixing plate (190).

8. The indoor environment intelligent dual-channel constant current sampler according to claim 7, characterized in that: Four rubber pads are also provided at the bottom of the box body (120), and the four rubber pads are evenly arranged along the circumference of the fixing plate (190).

9. The intelligent dual-channel constant current sampler for indoor environment according to claim 7, characterized in that: The invention also comprises a protection box (400), wherein a protection layer is provided in the protection box (400), and storage grooves adapted to the device body (100), the absorption bottle support (230), the bubble absorption bottle (210), the anti-backflow bottle (220), and the tripod (300) are respectively provided in the protection layer.

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