CN202024910U - Constant-current gas sampling device - Google Patents
Constant-current gas sampling device Download PDFInfo
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- CN202024910U CN202024910U CN 201120103278 CN201120103278U CN202024910U CN 202024910 U CN202024910 U CN 202024910U CN 201120103278 CN201120103278 CN 201120103278 CN 201120103278 U CN201120103278 U CN 201120103278U CN 202024910 U CN202024910 U CN 202024910U
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- cavity
- gas flow
- flow sensor
- stack shell
- gas
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Abstract
The utility model relates to the field of gas samplers, and discloses a constant-current gas sampling device, which comprises a cylinder body and a cavity, wherein the cylinder body internally comprises cylinder body space; a gas flow sensor is arranged inside the cylinder body space, and is provided with a gas flow sensor air inlet and a gas flow sensor air outlet; an air tap is arranged at the front end of the cylinder body, and the gas flow sensor air inlet can be communicated with the outside of the cylinder body through the air tap; the cavity comprises a cavity front wall, a cavity side wall and a cavity rear wall; a cavity front wall air hole is formed on the cavity front wall, so that the gas flow sensor air outlet is communicated with the interior of the cavity; a fan close to the front position is arranged inside the cavity; and a heat dissipation window is formed on the cavity rear wall. The constant-current gas sampling device leads gas to flow continuously and keep constant flow rate by using the fan and utilizing a control circuit and a voltage regulating distributing circuit, thereby enabling the sampling device to achieve higher precision and be more convenient to operate.
Description
Technical field
The utility model relates to the gas sampler field, relates in particular to a kind of constant current gas sampling assembly.
Background technology
The cardinal principle of air sampler is with the sampling pump draw samples, adopts the different steady flow measures and the method for time synchronisation, reaches gaseous state or steam sample in the quantitative collection atmosphere, for use in the objectionable constituent of analyzing wherein.Existing air sampler during mainly by membrane pump, variable valve, impact damper, flowmeter, electronics control circuit, under-voltage indicating circuit and power supply etc. partly form.The weak point that existing air sampler exists is mainly: 1, the membrane pump of sampling thief or flow are reconciled the used material of device and can produce distortion when temperature variation, cause the variation of flow; 2, gas flow is difficult to automatic adjusting, needs manual operation to regulate flow, and error is bigger; 3, membrane pump, surge flask and temperature control equipment cause that sampling thief costs an arm and a leg, volume is big, be not easy to carry; 4, to cause gas flow pattern be one one in the use of membrane pump, but not continuous flow finally causes under total time integral, and total flow is inaccurate; 5, the noise that causes of membrane pump is big.
The utility model content
(1) technical matters that will solve
The technical problems to be solved in the utility model provides a kind of constant current gas sampling assembly, makes the gas can continuous flow, and can regulate flow fast and effectively automatically, remains the flow that just pre-sets before the startup.And reduce volume, reduce cost, reduce noise.
(2) technical scheme
For solving the problems of the technologies described above, the utility model proposes a kind of constant current gas sampling assembly, comprising:
Stack shell, has the stack shell space in it, be provided with the gas flow sensor that has gas flow sensor air intake opening and gas flow sensor gas outlet in the described stack shell space, the front end of described stack shell is provided with the valve that makes described gas flow sensor air intake opening and described stack shell external communications
Cavity, it comprises cavity antetheca, cavity wall and cavity rear wall, described cavity antetheca is provided with cavity antetheca pore, make the internal communication of described gas flow sensor gas outlet and described cavity, the forward part in the inside of described cavity is provided with fan, and described cavity rear wall is provided with the heat radiation window.
Wherein, described cavity wall is provided with control circuit and voltage-regulation distributor circuit, is used to control described fan, and described circuit is provided with operation keyboard.
Wherein, the front end in described stack shell space also is provided with the stack shell pore, and described valve and described stack shell pore are communicated with, and described gas flow sensor air intake opening passes described stack shell pore.
Wherein, the rear end of described stack shell is provided with a plurality of slots, and described cavity antetheca is provided with a plurality of latches that cooperate with described slot.
Wherein, described cavity rear wall by a plurality of screw retention on described cavity wall.
Wherein, described cavity wall is provided with battery compartment, is provided with accumulator in it, and described cavity rear wall is provided with power switch.
(3) beneficial effect
Technique scheme of the present utility model has following advantage: by using fan and utilizing control circuit and the voltage-regulation distributor circuit, make that gas can continuous flow and constant flow, thereby make the degree of accuracy of sampling apparatus higher and easy to operate.By not using surge flask, temperature control equipment, flowmeter etc., make that cost reduces, volume reduces.By not using membrane pump, cavity is made with sound insulating material and is made noise reduce.
Description of drawings
Fig. 1 is the structural representation of constant current gas sampling assembly embodiment of the present utility model.
Wherein, 1: valve; 2: stack shell; 3: slot; 4: latch; 5: the gas flow sensor air intake opening; 6: gas flow sensor; 7: the gas flow sensor gas outlet; 8: the cavity antetheca; 9: cavity; 10: fan; 11: cavity wall; 12: wiring board; 13: control circuit; 14: operation keyboard; 15: display; 16: the voltage-regulation distributor circuit; 17: battery compartment; 18: accumulator; 19: the battery compartment lid; 20: screw; 21: the charger socket; 22: the heat radiation window; 23: power switch; 24: the cavity rear wall; 25: the stack shell space; 26: the stack shell pore; 27: cavity antetheca pore.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used to illustrate the utility model, but are not used for limiting scope of the present utility model.
Be illustrated in figure 1 as the synoptic diagram of constant current gas sampling assembly of the present utility model, comprise: stack shell 2, gas flow sensor 6, cavity 9, fan 10 and control circuit 13 etc.
Can comprise cavity wall 11 and cavity antetheca 8 and cavity rear wall 24 by the cavity 9 that sound insulating material is made.Cavity 9 is inner to be formed a front portion and is divided into rounded back section and is divided into square space, and the front portion is divided into circle and helps being provided with fan 10, and the rear portion is divided into square usefulness and is beneficial to control circuit etc. is set.Cavity antetheca 8 is provided with cavity antetheca pore 27, is communicated with cavity 9 thereby cavity antetheca pore 27 penetrates cavity antetheca 8, also is provided with a plurality of latches 4 on the cavity antetheca 8.Cavity rear wall 24 is fixed on the rear end of cavity wall 11 by a plurality of screws 20.Fan 10 is arranged on the forward part in the cavity 9.Wiring board 12 is arranged on the rear portion of cavity wall 11, and the inboard of wiring board 12 is provided with control circuit 13 and voltage-regulation distributor circuit 16, and the outside of wiring board 12 is provided with display 15 and operation keyboard 14.Battery compartment 17 and battery compartment lid 19 also are arranged on the rear portion of cavity wall 11, are provided with accumulator 18 in the battery compartment 17.In embodiment of the present utility model, also can directly use external power supply.Cavity rear wall 24 is provided with the charger socket 21 that is used for accumulator 18 chargings, heat radiation window 22 that is used to dispel the heat and power switch 23.
The front end of stack shell 2 is provided with valve 1, and the front end in the stack shell space 25 of stack shell 2 inside is provided with stack shell pore 26, and valve 1 penetrates stack shell pore 26 and is communicated with stack shell space 25.The rear end of stack shell 2 is provided with the slot 3 that cooperates with a plurality of latches 4, makes stack shell 2 and cavity 9 combinations.
Gas flow sensor 6 is arranged in the stack shell space 25, himself have air intake opening 5 and gas outlet 7, air intake opening 5 is inserted in the stack shell antetheca pore 27, thereby is communicated with the gas of being sampled, gas flow sensor gas outlet 7 is inserted in the cavity antetheca pore 27, thus with the internal communication of cavity 9.The shape in stack shell space 25 matches with the shape of gas flow sensor 6.
The specific operation process of the utility model device embodiment is: with gas collector (activated charcoal detector tube for example, miniature sampling head or solid adsorbent pipe) access valve 1, turn on the power switch 23, whether observation display 15 the display power supply under-voltage, if show the under-voltage charging that then needs, if it is not under-voltage then by pressing operation keyboard 14 and observation display 15 is provided with gas flow and sampling time, finish after being provided with by the start key on the operation keyboard, fan 10 begins to rotate discharges the gas in the cavity 9 by heat radiation window 22, cavity 9 forward parts produce negative pressure space, like this under the atmospheric pressure effect, gas enters gas flow sensor 6 by gas collector from valve 1, enter cavity 9 inside from gas flow sensor 6 again, be discharged from from heat radiation window 22 by fan 10 at last, in this process, gas flow sensor 6 can produce electric signal and the input control circuit 13 that is directly proportional with current gas flow size, the electric signal of 13 pairs of inputs of control circuit is judged, then continue the operating voltage that fan 10 is given in maintenance if the electric signal of input is identical with the analog value of set gas flow, the rotating speed of fan 9 is remained unchanged.If the electric signal sent here is different with the analog value of set gas flow, then control circuit 13 is adjusted the operating voltage of fan 10, stop adjustment until the analog value of the electric signal of gas flow sensor 6 input and set gas flow is identical, and keep corresponding work voltage to give fan 10, thereby make fan 10 keep corresponding rotating speeds to keep gas flow constant.When sampling working time to during the working time that sets in advance, the operating voltage that control circuit 13 cuts off fans 10 quits work fan 10, finishes sampling work powered-down switch 23.
The advantage of gas constant current sampling apparatus of the present utility model is as follows: 1, utilize the fan characteristics of mobile gas continuously, and place cavity to allow gas flow in fan along a predetermined pipeline, its flow size is directly proportional with the rotating speed of fan, and rotating speed is directly proportional with the motor input voltage of fan, just can reach the purpose of automatic adjustments of gas flow size by regulating this voltage automatically; 2, because the noise of fan is littler than membrane pump, again because fan places cavity, and cavity can be made by sound insulating material, so this method can reach the purpose of reducing noise.3, fan substitutes membrane pump and surge flask, makes device volume little, is easy to carry.4, when utilizing fan sampling, the heat of generation such as control circuit is also dispelled the heat, prolonged the serviceable life of installing.
The above only is an embodiment of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (6)
1. a constant current gas sampling assembly is characterized in that, comprising:
Stack shell (2), has stack shell space (25) in it, be provided with the gas flow sensor (6) that has gas flow sensor air intake opening (5) and gas flow sensor gas outlet (7) in the described stack shell space (25), the front end of described stack shell (2) is provided with the valve (1) that makes described gas flow sensor air intake opening (5) and described stack shell (2) external communications
Cavity (9), it comprises cavity antetheca (8), cavity wall (11) and cavity rear wall (24), described cavity antetheca (8) is provided with cavity antetheca pore (27), make the internal communication of described gas flow sensor gas outlet (7) and described cavity (9), the forward part in inside of described cavity (9) is provided with fan (10), and described cavity rear wall (24) is provided with heat radiation window (22).
2. constant current gas sampling assembly as claimed in claim 1, it is characterized in that, described cavity wall (11) is provided with control circuit (13) and voltage-regulation distributor circuit (16), is used to control described fan (10), and described circuit is provided with operation keyboard (14).
3. constant current gas sampling assembly as claimed in claim 2, it is characterized in that, the front end in described stack shell space (25) also is provided with stack shell pore (26), and described valve (1) and described stack shell pore (26) are communicated with, and described gas flow sensor air intake opening (5) passes described stack shell pore (26).
4. constant current gas sampling assembly as claimed in claim 3 is characterized in that, the rear end of described stack shell (1) is provided with a plurality of slots (3), and described cavity antetheca (8) is provided with a plurality of latches (4) that cooperate with described slot (3).
5. constant current gas sampling assembly as claimed in claim 4 is characterized in that, described cavity rear wall (24) is fixed on the described cavity wall (11) by a plurality of screws (20).
6. constant current gas sampling assembly as claimed in claim 5 is characterized in that, described cavity wall (11) is provided with battery compartment (17), is provided with accumulator (18) in it, and described cavity rear wall (24) is provided with power switch (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120103278 CN202024910U (en) | 2011-04-11 | 2011-04-11 | Constant-current gas sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120103278 CN202024910U (en) | 2011-04-11 | 2011-04-11 | Constant-current gas sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202024910U true CN202024910U (en) | 2011-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120103278 Expired - Fee Related CN202024910U (en) | 2011-04-11 | 2011-04-11 | Constant-current gas sampling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202024910U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243148A (en) * | 2011-04-11 | 2011-11-16 | 北京市劳动保护科学研究所 | Constant flow gas sampling device and method |
-
2011
- 2011-04-11 CN CN 201120103278 patent/CN202024910U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243148A (en) * | 2011-04-11 | 2011-11-16 | 北京市劳动保护科学研究所 | Constant flow gas sampling device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111102 Termination date: 20180411 |