CN206696046U

CN206696046U - Protect gas sampler

Info

Publication number: CN206696046U
Application number: CN201720415433.2U
Authority: CN
Inventors: 李进
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-10-09
Filing date: 2017-04-19
Publication date: 2017-12-01
Anticipated expiration: 2027-04-19

Abstract

Inflammable, explosion hazard gases sampling field is the utility model is related to, gas sampler is protected more particularly, to one kind.It includes cylinder body, piston, guide rod and end cap；The piston is slidably arranged in the cylinder body, and the guide rod is fixedly installed on one end of the piston；The end cap is fixedly installed on the both ends of the cylinder body, for being sealed to cylinder interior；Cavity is provided with the piston, the breather line connected with the cavity is provided with the guide rod；Compressed air is provided with the cavity.Protection gas sampler provided by the utility model; by the way that cavity will be set in piston; compressed gas is set in cavity; the cavity of piston upper and lower ends is split using compressed gas; avoid the gas mixing in two cavitys; situation about being exploded after flammable explosive gas contact is avoided, improves security, reliability, operability and precision in flammable explosive gas sampling process.

Description

Protect gas sampler

Technical field

Inflammable, explosion hazard gases sampling field is the utility model is related to, gas sampler is protected more particularly, to one kind.

Background technology

In inflammable, explosion hazard gases sampling process, in order to prevent flammable explosive gas and the oxygen gas component in air and other The contaminant gases of easily pollution sample gas directly or indirectly contact, it usually needs take special measure to be handled.

During being sampled such as natural gas, using special sealing air accumulator as gas sample gas storage device, it is used in combination Seal water and be used as spacer medium, by natural gas and air and other compositions for easily polluting sample gas, such as nitrogen, oxygen, entirely Portion is isolated.

But there is the shortcomings of equipment is huge, and sampling pressure is not easy to control in the above method and sampling apparatus.

How current sampling method and device are solved, the security present in inflammable, explosion hazard gases sampling process, behaviour The problem of property made etc. is present, the reliability and precision of sampler how are improved, be present urgent problem to be solved.

Utility model content

The purpose of this utility model is to provide a kind of protection gas sampler, to solve technology present in prior art Problem.

Protection gas sampler provided by the utility model, including cylinder body, piston, guide rod and end cap；

The piston is slidably arranged in the cylinder body, and the guide rod is fixedly installed on one end of the piston；

The end cap is fixedly installed on the both ends of the cylinder body, for being sealed to cylinder interior；

Cavity is provided with the piston, the breather line connected with the cavity is provided with the guide rod；

Compressed air is provided with the cavity.

Further, it is provided with inert gas in the cavity.

Further, the inert gas is helium, nitrogen or carbon dioxide.

Further, protection gas sampler also includes rope sensor, and the rope sensor is connected with the piston, For detecting the position of the piston.

Further, the piston includes upper cavity, upper cover plate, back-up ring, lower chamber and lower cover；

The upper cavity, the upper cover plate, the back-up ring, the lower chamber and the lower cover are sequentially connected, and coaxially Set；

The upper cavity, the back-up ring and the lower chamber are circular ring structure, are formed for storage protection gas in it The cavity.

Further, it is provided with runner on the piston upper cover plate or the end cap.

Further, it is respectively provided between the upper cavity and the upper cover plate, between the lower chamber and the lower cover There is the first sealing ring.

Further, the second sealing ring is provided with the piston, for the inwall to the piston and the cylinder body it Between sealed.

Further, the gas pressure in the cavity is more than the gas pressure in the cavity at the piston both ends.

Further, in two cavitys that the piston splits the cylinder body, it is provided with the cavity of guide rod and sets Gas sampled, working gas is set in another cavity.

Protection gas sampler provided by the utility model, by will set cavity in piston, sets compression in cavity Gas, the cavity of piston upper and lower ends is split using compressed gas, avoids the gas mixing in two cavitys, avoids inflammable Situation about exploding after explosion hazard gases contact, improve security in flammable explosive gas sampling process, reliability, behaviour The property made and precision.

Brief description of the drawings

, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, describe below In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is the structural representation for the protection gas sampler that the utility model embodiment provides；

Fig. 2 is the front view for the protection gas sampler that the utility model embodiment provides；

Fig. 3 is Fig. 2 A-A sectional views；

Fig. 4 is Fig. 3 B-B sectional views；

Fig. 5 is Fig. 3 C-C sectional views；

Fig. 6 is the stereogram for the protection gas sampler that the utility model embodiment provides.

Reference：

1：Lower connecting pipe；2：Work gas source chamber body；3：Protective gas cavity；4：Sample gas cavity；5：Sample chamber gas Body air inlet pipe；6：Sample gas chamber escape pipe；7：Breather line；8：Bottom end cover；9：Cylinder body；10：Clamp nut；11：Guide rod； 12：Upper end cover；13：Rope sensor；14：Drawstring；15：Drawstring installing plate；16：First sealing ring；17：Second sealing ring；18： Lower cover；19：Lower chamber；20：Back-up ring；21：Upper cavity；22：Upper cover plate；23：Fastening assembly；24：Runner.

Embodiment

The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality Novel protected scope.

, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular Directly ", the orientation of the instruction such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only Described for the ease of description the utility model and simplifying, rather than instruction or imply signified device or element must have it is specific Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.

In addition, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or implying phase To importance.

, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition Concrete meaning of the language in the utility model.

As shown in figures 1-6, the utility model provides a kind of protection gas sampler, including cylinder body 9, piston, guiding Bar 11 and end cap；

The piston is slidably arranged in the cylinder body 9, and the guide rod 11 is fixedly installed on one end of the piston；

The end cap is fixedly installed on the both ends of the cylinder body 9, for being sealed inside cylinder body 9；

Cavity is provided with the piston, the breather line 7 connected with the cavity is provided with the guide rod 11；

Compressed air is provided with the cavity.

In the present embodiment, guide rod 11 is fixedly connected with the piston by clamp nut 10.

In the present embodiment, compressed air is inert gas.

In the present embodiment, two cavity portions, respectively sample gas cavity 4 will be divided into inside cylinder body 9 using piston With work gas source chamber body 2, and increase protective gas cavity 3 between sample gas cavity 4 and work gas source chamber body 2, intracavitary is filled Enter inert gas, the oxygen in flammable explosive gas and compressed air can be isolated, prevent it to be blended to produce explosion accident.

Inert protective gas isolates the technology of flammable explosive gas and other gases, prevents its mixing, inflammable so as to solve Explosion hazard gases sampling security, reliability, operability the problems such as.

In the present embodiment, protective gas cavity 3 is arranged on internal piston, by the breather line 7 of guide rod 11 with it is outer Boundary connects, and can be inflated and deflate.

In the present embodiment, the upper and lower ends of cylinder body 9 are provided with end cap, respectively upper end cover 12 and bottom end cover 8.At this In embodiment, sample chamber gas inlet pipe 5 and sample gas chamber escape pipe 6 are provided with upper end cover 12, for sample gas chamber Enter outlet in body 4；Lower connecting pipe 1 is provided with bottom end cover 8, for carrying out inflation/deflation to work gas source chamber body 2.

When in use, by the way that to being inflated in work gas source chamber body 2, after being compressed gas, air pressure raises, and then Promote piston to be moved to the direction of sample gas cavity 4, and then the sample gas in sample gas cavity 4 are gone out from sample gas chamber Discharged in tracheae 6, to reach the purpose of sample gas sampling.

Preferred embodiment is that the inert gas is helium, argon gas, nitrogen or carbon dioxide.

Inert gas medium in protective gas cavity 3 is by special selection, when being such as sampled to natural gas, is adopted By the use of helium as protective gas, by the use of compressed air as working gas, so as to prevent the oxygen mix in natural gas and air And the contaminated problem of sample gas occur and occur, and prevent that natural gas is mixed with oxygen and two produce blast, improve the safety of device Property.

In addition when natural gas samples, helium is filled with protective gas cavity 3, the nitrogen being also possible to prevent in compressed air Gas enters in sample gas and pollutes sample gas, occurs so as to avoid sampling the problem of inaccurate.

It is pointed out that in the present embodiment, inert gas is using helium, but it is not limited solely to helium, Other kinds of inert gas is can also be, it can specifically be selected according to specific use environment, as long as can incite somebody to action After working gas and gas sampled separation, gas burst is prevented.

Preferred embodiment is, protection gas sampler also includes rope sensor 13, the rope sensor 13 and The piston connection, for detecting the position of the piston.

The function of rope sensor 13 is that mechanical movement is converted into measuring, the electric signal for recording or transmitting.Drawstring Sensor 13 is wound on a threaded wheel hub by stretchable stainless steel cable, and this wheel hub and a precision rotation inductor connect It is connected together, inductor can be incremental encoder, absolute (independence) encoder, mixing or conductive plastics rotating potentiometer, together Walk device or resolver.

In operation, rope sensor 13 is arranged on fixed position, and drawstring 14 is tied on mobile object.The straight line of drawstring 14 is transported The alignment of dynamic and mobile object axis of movement.When motion occurs, drawstring 14 stretches and shunk.One contained spring ensures drawstring 14 Rate of tension is constant.Threaded wheel hub drives precision rotation inductor to rotate, and output one is proportional to the displacement of drawstring 14 Electric signal.Measurement output signal can draw displacement, direction or the speed of moving object.

In the present embodiment, rope sensor 13 is arranged on the upper end cover 12 of cylinder body 9, and one end and the drawstring of drawstring 14 pass Sensor 13 connects, and after the other end passes through the drawstring installing plate 15 on guide rod 11, is connected by breather line 7 with piston.Work as work When plug is mobile, the position of piston can be accurately judged by rope sensor 13.

It is pointed out that in the present embodiment, the judgement to the position of piston is to use rope sensor 13, but it is not Rope sensor 13 is limited only to, it can also be other kinds of sensor, as long as it can be carried out to the position of piston Judgement.

Preferred embodiment is that the piston includes upper cavity 21, upper cover plate 22, back-up ring 20, lower chamber 19 and lower cover Plate 18；

The upper cavity 21, the upper cover plate 22, the back-up ring 20, the lower chamber 19 and the lower cover 18 connect successively Connect, and be coaxially disposed；

The upper cavity 21, the back-up ring 20 and the lower chamber 19 are circular ring structure, form in it and are protected for storing Protect the cavity of gas.

Piston component is by lower cover 18, lower chamber 19, back-up ring 20, upper cavity 21, upper cover plate 22 and some fastening assemblies 23 grades form.Material is carried out in upper cavity 21 and lower chamber 19 as far as possible to process, reduces the deadweight of piston.

Alignment positioning device is provided with piston, each several part can convenient centering.There are hole, inert gas inside back-up ring 20 Easily it can be entered by the hole in the cavity that the sealing ring in the middle part of piston formed.

Preferred embodiment is to be provided with runner 24 on the piston upper cover plate 22 or the end cap.

On upper end cover 12 or upper cover plate 22 in sample gas cavity 4, the runner 24 for cleaning cylinder is provided with.For The high-precision sample gas of acquirement, are cleaned before officially drawn sample, it is necessary to before sampling to cylinder body 9, to sample cylinder Remaining gas inside body 9 cleans up.But generally, sampling cylinder body 9 accumulate it is larger, due to the property of fluid, cylinder body 9 it is dead Angle part, it is difficult to be emptied completely.These gases remained in dead angle are easily accessible in sample gas, pollute sample gas Body.Runner 24 in the present embodiment, can be fully erased by the residual gas in cylinder easily, so as to ensure the precision of sample.

In the present embodiment, runner 24 setting as shown in figure 5, the sample gas chamber inlet/outlet pipe of sample gas cavity 4 and Sample gas chamber escape pipe 6 passes through runner 24 and the position that is contacted around upper end cover 12 or upper cover plate 22 with the inwall of cylinder body 9 Connection is put, timely all sample gas inside cylinder body 9 can be discharged, ensure that the precision of sample gas.

Preferred embodiment is, between the upper cavity 21 and the upper cover plate 22, the lower chamber 19 with it is described under The first sealing ring 16 is provided between cover plate 18.

In the present embodiment, the first sealing ring 16 is O-ring seal.

O-ring seal is a kind of rubber ring of section for circle, because its section is O-shaped, therefore is called O-ring seal.It is O-shaped Sealing ring is mainly used in mechanical part prevents the leakage of liquids and gases medium in a static condition.In some cases, it is O-shaped close Seal can also be used as the dynamic sealing element of axially reciprocating and low-speed rotation.According to different conditions, can select respectively Different materials is selected to be adapted therewith.

It is pointed out that in the present embodiment, the first sealing ring 16 is O-ring seal, but its be not limited solely to it is O-shaped Sealing ring, it can also be other kinds of sealing ring or sealing structure, that is to say, that if its can by upper cavity 21 with it is upper Sealed between cover plate 22, between lower chamber 19 and lower cover 18.

Preferred embodiment is that the second sealing ring 17 is provided with the piston, for the piston and the cylinder Sealed between the inwall of body 9.

In the present embodiment, the second sealing ring 17 is y-type seal ring.

Y-type seal ring is affixed on sealing pair coupled face by the lip of its opening.During without internal pressure, only because of the deformation of procheilon and Produce the contact of very little.In the case of sealing, have on the every bit that is contacted with sealing medium equal with pressure medium Normal pressure, so lip-shaped ring bottom will be axially compressed, lip is contacted with sealing surface and broadened, together by circumferential compression When contact stress increase.When internal pressure raises again, the distribution form and size of contact further change, lip and sealing surface Cooperation is closer, so better tightness, here it is " self-tightening " of Y shape circle.Due to this self-tightening, a Y shape circle 32MPB high pressure can effectively be sealed.

Y-type seal ring has sealing property reliable；Frictional resistance is small, stable movement；Resistance to pressure is good, is applicable pressure limit Extensively；It is simple in construction, it is cheap；The advantages that easy for installation.

It is pointed out that in the present embodiment, the second sealing ring 17 can use y-type seal ring, but it is not only Y-type seal ring is confined to, the flowers are in blossom and is other kinds of sealing ring or sealing structure for it, that is to say, that as long as it can be to work Sealed between plug and the inwall of cylinder body 9.

Preferred embodiment is that the gas pressure in the cavity is more than the gas pressure in the cavity at the piston both ends Power.

In the present embodiment, the pressure in protective gas cavity 3 is consistently higher than the pressure in sample gas cavity 4, simultaneously Pressure in protective gas cavity 3 is also consistently higher than the pressure of work gas source chamber body 2.

The gas in sample gas cavity 4 is so may insure, at any time, including y-type seal ring appearance is serious close Seal it is bad in the case of, may not flow into protective gas cavity 3；It also ensure that the pressure of work gas source chamber body 2 will not flow simultaneously Enter into protective gas cavity 3.

So gas sampled is fundamentally prevented and working gas directly or indirectly contacts, so as to fundamentally prevent The oxygen mix of flammable explosive gas and working gas, ensure being perfectly safe for sampling.

In the present embodiment, the pressure in sample gas cavity 4 is slightly above external atmosphere pressure, so as in sample gas The sealing ring of cavity 4 largely in the case of leakage, can prevent air stream sample introduction sheet in the external atmosphere pressure in external atmosphere pressure In gas cavity 4, so as to prevent potential safety hazard, and ensure that sample gas is not contaminated.

Preferred embodiment is in two cavitys that the piston splits the cylinder body 9, to be provided with guide rod 11 Gas sampled is set in cavity, working gas is set in another cavity.

In the present embodiment, by controlling the compressed air inside work gas source chamber body 2 to realize the action of cylinder piston. When piston is conducted oneself with dignity and the pressure sum in caused pressure and sample gas cavity 4 is less than the pressure in work gas source chamber body 2, Cylinder piston rises；Conversely, piston declines, equal then piston is slack.

Sample gas cavity 4 is placed in the top of cylinder body 9, and protective gas cavity 3 is placed in the middle part of cylinder body 9, and work gas source chamber body 2 is put In the bottom of cylinder body 9.It is that piston deadweight can have certain shadow to each operating pressure of cylinder body 9 in sampling cylinder using the reason for this structure Ring.The purpose of above-mentioned arrangement is to reduce the pressure requirements in sampling cylinder, the utility model is may operate in lower pressure.

Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly The scope of each embodiment technical scheme of type.

Claims

1. one kind protection gas sampler, it is characterised in that including cylinder body, piston, guide rod and end cap；

Cavity is provided with the piston, the breather line connected with the cavity is provided with the guide rod.

2. protection gas sampler according to claim 1, it is characterised in that be provided with inert gas in the cavity.

3. protection gas sampler according to claim 2, it is characterised in that the inert gas is helium, argon gas, nitrogen Gas or carbon dioxide.

4. protection gas sampler according to claim 1, it is characterised in that also including rope sensor, the drawstring Sensor is connected with the piston, for detecting the position of the piston.

5. it is according to claim 1 protection gas sampler, it is characterised in that the piston include upper cavity, upper cover plate, Back-up ring, lower chamber and lower cover；

The upper cavity, the upper cover plate, the back-up ring, the lower chamber and the lower cover are sequentially connected, and are coaxially disposed；

The upper cavity, the back-up ring and the lower chamber are circular ring structure, and the institute for storage protection gas is formed in it State cavity.

6. protection gas sampler according to claim 5, it is characterised in that on the piston upper cover plate or the end cap It is provided with runner.

7. protection gas sampler according to claim 5, it is characterised in that the upper cavity and the upper cover plate it Between, between the lower chamber and the lower cover be provided with the first sealing ring.

8. protection gas sampler according to claim 5, it is characterised in that the second sealing is provided with the piston Circle, for being sealed between the inwall of the piston and the cylinder body.

9. protection gas sampler according to claim 1, it is characterised in that the gas pressure in the cavity is more than institute State the gas pressure in the cavity at piston both ends.

10. protection gas sampler according to claim 1, it is characterised in that the piston splits the cylinder body In two cavitys, it is provided with the cavity of guide rod and gas sampled is set, working gas is set in another cavity.