CN105784431A - Airtight chamber and method for balancing air pressure inside airtight chamber - Google Patents
Airtight chamber and method for balancing air pressure inside airtight chamber Download PDFInfo
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- CN105784431A CN105784431A CN201410797982.1A CN201410797982A CN105784431A CN 105784431 A CN105784431 A CN 105784431A CN 201410797982 A CN201410797982 A CN 201410797982A CN 105784431 A CN105784431 A CN 105784431A
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- rotary valve
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- confined chamber
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Abstract
The invention discloses an airtight chamber and a method for balancing air pressure inside the airtight chamber.An air collecting bag a is arranged outside an airtight chamber box body, an air inlet-outlet of the air collecting bag a is connected with a port a of a three-way pneumatic rotary valve a, a port b of the three-way pneumatic rotary valve a is directly led to the inside of the airtight chamber box body, and an air outlet c of the three-way pneumatic rotary valve a is connected with a vacuum pump.A air collecting bag b is arranged on a ceiling inside the airtight chamber box body, an air inlet-outlet of the air collecting bag b is connected with a port d of a three-way pneumatic rotary valve b, a port e of the three-way pneumatic rotary valve b is directly led to the atmospheric environment outside the airtight chamber box body, and an air outlet f of the three-way pneumatic rotary valve b is connected with the vacuum pump.The air collecting bags are attached with supports, vacuum pumping is clean and thorough, the requirement is rapidly met, air tightness is good, no leakage or chemical reaction is produced, test data is accurate, and test reproducibility is good.
Description
Technical field
The present invention relates to a kind of confined chamber and confined chamber internal gas pressure balance method.
Background technology
Confined chamber method is a kind of method of motorcycle fuel evaporation emissions measurement general in the world.In experimentation, the change of airtight indoor environment temperature can cause the pressure in confined chamber to occur floating, and the change of the pressure of confined chamber can affect EVAP speed, thus the accuracy affecting test is repeatable.Therefore flexible extension container should be installed on confined chamber, to balance the pressure change caused due to the minor variations of temperature.Simultaneously as combustion main body of oil is Hydrocarbon, sulfide etc., selected flexible extension container must not permeate and volatilize these materials, also can not react with these materials.
In addition, during experiment, in the fuel oil of evaporation, main component is Hydrocarbon, sulfide, and majority of gas collecting bag adopts plastic interface or metal interface, and with rubber seal, having that sealing property is not up to standard, be prone to the problems such as Hydrocarbon sulfide generation chemical reaction, ventilation valve body is not only easily corroded, impact adopts the air-tightness of gas sampling bag, also has a strong impact on testing result simultaneously.
Summary of the invention
In order to overcome the problems referred to above, it is an object of the invention to provide a kind of collection and confinement of gases bag, effectively solve the problems such as collection and confinement of gases bag evacuation is not thoroughly, sealing property is poor, corrosion resistance is poor in prior art.
The present invention be the technical scheme is that for achieving the above object
A kind of confined chamber of equilibrium air pressure, including vacuum pump, collection and confinement of gases bag a, collection and confinement of gases bag b, threeway pneumatic rotary valve a, the pneumatic rotary valve b of threeway, described collection and confinement of gases bag a is arranged on outside confined chamber, the air inlet/outlet of described collection and confinement of gases bag a is connected with the mouth a of the pneumatic rotary valve a of threeway, inside the straight-through confined chamber of the mouth b of the pneumatic rotary valve a of threeway, the gas outlet c of the pneumatic rotary valve a of described threeway is connected with vacuum pump；Described collection and confinement of gases bag b is arranged on the furred ceiling in confined chamber, the air inlet/outlet of described collection and confinement of gases bag b is connected with the mouth d of the pneumatic rotary valve b of threeway, the straight-through atmospheric environment outside confined chamber of the mouth e of the pneumatic rotary valve b of described threeway, the gas outlet f of the pneumatic rotary valve b of threeway is connected with vacuum pump.
It is yet another object of the invention to provide a kind of air pressure balance method of confined chamber, comprise the following steps:
Before experiment starts, by pneumatic for threeway rotary valve a connected entrance a and gas outlet c, threeway pneumatic rotary valve b connected entrance d and gas outlet f, open vacuum pump, by the evacuating air in collection and confinement of gases bag a and gas collecting bag b, until its pressure reaches a stable background value.
During experiment, if the temperature of confined chamber reduces, being connected with mouth d by the mouth e of pneumatic for threeway rotary valve b, air enters collection and confinement of gases bag b, collection and confinement of gases bag b by the pneumatic rotary valve b of threeway and expands, and confined chamber net volume reduces, and confined chamber inner and outer air pressure keeps consistent.If the temperature of confined chamber raises, being connected with mouth b by the mouth a of pneumatic for threeway rotary valve a, the gas in confined chamber enters collection and confinement of gases bag a, collection and confinement of gases bag a by the pneumatic rotary valve a of threeway and expands, and confined chamber net volume increases, and confined chamber inner and outer air pressure keeps consistent.
When experiment terminates, by pneumatic for threeway rotary valve a connected entrance a and gas outlet c, threeway pneumatic rotary valve b connected entrance d and gas outlet f, open vacuum pump, by the evacuating air in collection and confinement of gases bag a and gas collecting bag b, until its pressure reaches a stable background value, use during in order to experiment.
The beneficial effect of the invention:
1, with supporting in this collection and confinement of gases bag, totally thorough during evacuation, it is rapidly reached requirement；
2, the air-tightness of this collection and confinement of gases bag is good, and No leakage is without chemical reaction, and test data are accurate, test favorable reproducibility.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram；
Present configuration schematic diagram when Fig. 2 is temperature reduction；
Fig. 3 is temperature very inventive structure schematic diagram when rising；
In figure, 1, vacuum pump；2, collection and confinement of gases bag a；3, collection and confinement of gases bag b；4, the pneumatic rotary valve a of threeway；5, the pneumatic rotary valve b of threeway；6, confined chamber；41, mouth a；42, mouth b；43, gas outlet c；51, mouth d；52, mouth e；53, gas outlet f.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, a kind of confined chamber of equilibrium air pressure, including vacuum pump 1, collection and confinement of gases bag a2, collection and confinement of gases bag b3, threeway pneumatic rotary valve a4, the pneumatic rotary valve b5 of threeway, it is outside that described collection and confinement of gases bag a2 is arranged on confined chamber 6, the air inlet/outlet of described collection and confinement of gases bag a2 is connected with the mouth a41 of the pneumatic rotary valve a4 of threeway, the straight-through confined chamber 6 of the mouth b42 of the pneumatic rotary valve a4 of threeway is internal, and the gas outlet c43 of the pneumatic rotary valve a4 of described threeway is connected with vacuum pump 1；Described collection and confinement of gases bag b3 is arranged on the furred ceiling in confined chamber 6, the air inlet/outlet of described collection and confinement of gases bag b3 is connected with the mouth d51 of the pneumatic rotary valve b5 of threeway, the straight-through atmospheric environment outside confined chamber 6 of the mouth e52 of the pneumatic rotary valve b5 of described threeway, the gas outlet f53 of the pneumatic rotary valve b5 of threeway is connected with vacuum pump 1.
A kind of air pressure balance method of confined chamber, comprises the following steps:
Before experiment starts, by pneumatic for threeway rotary valve a4 connected entrance a41 and gas outlet c43, threeway pneumatic rotary valve b5 connected entrance d51 and gas outlet f53, open vacuum pump 1, by the evacuating air in collection and confinement of gases bag a2 and gas collecting bag b3, until its pressure reaches a stable background value.
During experiment, if as in figure 2 it is shown, the temperature of confined chamber 6 reduces, being connected with mouth d51 by the mouth e52 of pneumatic for threeway rotary valve b5, air enters collection and confinement of gases bag b3, collection and confinement of gases bag b3 by the pneumatic rotary valve b5 of threeway and expands, confined chamber 6 net volume reduces, and confined chamber 6 inner and outer air pressure keeps consistent.If the temperature of confined chamber 6 raises, being connected with mouth b42 by the mouth a41 of pneumatic for threeway rotary valve a4, the gas in confined chamber 6 enters collection and confinement of gases bag a2, collection and confinement of gases bag a2 by the pneumatic rotary valve a4 of threeway and expands, confined chamber 6 net volume increases, and confined chamber 6 inner and outer air pressure keeps consistent.
When experiment terminates, as shown in Figure 3, by pneumatic for threeway rotary valve a4 connected entrance a41 and gas outlet c43, threeway pneumatic rotary valve b5 connected entrance d51 and gas outlet f53, open vacuum pump 1, by the evacuating air in collection and confinement of gases bag a2 and gas collecting bag b3, until its pressure reaches a stable background value, use during in order to experiment.
The above; it is only the present invention preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; any those familiar with the art is in the technical scope of present disclosure; it is equal to replacement according to technical scheme and inventive concept thereof or is changed, all should be encompassed within protection scope of the present invention.
Claims (2)
1. a confined chamber, it is characterized in that: include vacuum pump, collection and confinement of gases bag a, collection and confinement of gases bag b, threeway pneumatic rotary valve a, the pneumatic rotary valve b of threeway, described collection and confinement of gases bag a is arranged on outside confined chamber, the air inlet/outlet of described collection and confinement of gases bag a is connected with the mouth a of the pneumatic rotary valve a of threeway, inside the straight-through confined chamber of the mouth b of the pneumatic rotary valve a of threeway, the gas outlet c of the pneumatic rotary valve a of described threeway is connected with vacuum pump；Described collection and confinement of gases bag b is arranged on the furred ceiling in confined chamber, the air inlet/outlet of described collection and confinement of gases bag b is connected with the mouth d of the pneumatic rotary valve b of threeway, the straight-through atmospheric environment outside confined chamber of the mouth e of the pneumatic rotary valve b of described threeway, the gas outlet f of the pneumatic rotary valve b of threeway is connected with vacuum pump.
2. the air pressure balance method of a kind of confined chamber as claimed in claim 1, it is characterised in that comprise the following steps:
1.. by pneumatic for threeway rotary valve a connected entrance a and gas outlet c, threeway pneumatic rotary valve b connected entrance d and gas outlet f, open vacuum pump, by the evacuating air in collection and confinement of gases bag a and gas collecting bag b, until its pressure reaches a stable background value；
2.. when the temperature of confined chamber reduces, being connected with mouth d by the mouth e of pneumatic for threeway rotary valve b, air enters collection and confinement of gases bag b, collection and confinement of gases bag b by the pneumatic rotary valve b of threeway and expands, and confined chamber net volume reduces, and confined chamber inner and outer air pressure keeps consistent；When the temperature of confined chamber raises, being connected with mouth b by the mouth a of pneumatic for threeway rotary valve a, the gas in confined chamber enters collection and confinement of gases bag a, collection and confinement of gases bag a by the pneumatic rotary valve a of threeway and expands, and confined chamber net volume increases, and confined chamber inner and outer air pressure keeps consistent；
3.. last, by pneumatic for threeway rotary valve a connected entrance a and gas outlet c, threeway pneumatic rotary valve b connected entrance d and gas outlet f, open vacuum pump, by the evacuating air in collection and confinement of gases bag a and gas collecting bag b, until its pressure reaches a stable background value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410797982.1A CN105784431A (en) | 2014-12-19 | 2014-12-19 | Airtight chamber and method for balancing air pressure inside airtight chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410797982.1A CN105784431A (en) | 2014-12-19 | 2014-12-19 | Airtight chamber and method for balancing air pressure inside airtight chamber |
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| Publication Number | Publication Date |
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| CN105784431A true CN105784431A (en) | 2016-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410797982.1A Pending CN105784431A (en) | 2014-12-19 | 2014-12-19 | Airtight chamber and method for balancing air pressure inside airtight chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594915A (en) * | 2018-06-27 | 2018-09-28 | 东莞市升微机电设备科技有限公司 | A kind of confined chamber and control method of volume adjustable |
| CN112946183A (en) * | 2019-12-10 | 2021-06-11 | 堀场仪器（上海）有限公司 | Closed evaporation test bin |
-
2014
- 2014-12-19 CN CN201410797982.1A patent/CN105784431A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594915A (en) * | 2018-06-27 | 2018-09-28 | 东莞市升微机电设备科技有限公司 | A kind of confined chamber and control method of volume adjustable |
| CN108594915B (en) * | 2018-06-27 | 2023-08-29 | 东莞市升微机电设备科技有限公司 | Volume-adjustable closed chamber and control method |
| CN112946183A (en) * | 2019-12-10 | 2021-06-11 | 堀场仪器（上海）有限公司 | Closed evaporation test bin |
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Application publication date: 20160720 |
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| WD01 | Invention patent application deemed withdrawn after publication |