CN207258334U - Seal safety head and reagent bottle - Google Patents

Abstract

A kind of sealing safety head, including lid, supporting part, filter and connector are the utility model is related to, lid includes the first openend, the second openend and extension passage；Supporting part seals the first openend for being coupled to lid, and offers some mounting holes along lid axis direction perforation supporting part；Filter includes body, filter membrane and check valve, body sealing is coupled to the corresponding mounting hole of supporting part, and is arranged at cavity including cavity and venthole, filter membrane, check valve is arranged at venthole, and the venthole is opened or close with the air pressure in response to venthole both sides；Connector is coupled to the corresponding mounting hole of supporting part.In this way, the reagent volatilization effectively obstructed in bottle is leaked in air, the physical and mental health of experimenter ensure that, and unidirectional response valve air pressure and be turned on and off, the air pressure in bottle is compensate for, ensures the stable gas pressure in bottle, improves the smoothness of reagent conveying.A kind of reagent bottle is also provided.

Description

Seal safety head and reagent bottle

Technical field

Chemical experiment utensil is the utility model is related to, more particularly to one kind sealing safety head and reagent bottle.

Background technology

With the development of constantly bringing forth new ideas of science and technology, the laboratory for chemical technology research and development experiment is more and more.Into During row chemical experiment, it is often necessary to add chemical reagent into test tube and chemically reacted, for example, in analytical and testing instrument (such as High performance liquid chromatograph) experiment in can use the reagents such as methanol, acetonitrile, hydrochloric acid, acetone.Usually, when in use, it is necessary to open The lid of reagent bottle, drawing liquid conduit is put in bottle, could be extracted reagent out and be used, but since many solvents are easily waved at normal temperatures Hair, not only pollutes environment, and influences the physical and mental health of experimenter.

To solve the problems, such as this, can achieve the purpose that to reduce reagent volatilization by reducing bottleneck open area, such as in bottle cap Upper drilling, instrument transfusion catheter is inserted into reagent bottle by the hole on bottle cap.One is played in this way, can be reduced to the volatilization of reagent Fixed effect, but still suffer from sealing it is not tight, cause reagent to volatilize, the hidden danger of chronic pollution extraneous air.

Utility model content

Based on this, it is necessary to which not tight for traditional sealing safety head sealing, reagent volatilization influences experimenter's body and mind and is good for The problem of health, there is provided one kind prevents organic volatile material to be discharged into air, and ensures the sealing safety head of the smooth conveying of reagent And reagent bottle.

Safety head is sealed, including：

Lid, including the first openend, the second openend and extend between the first openend and second openend Extension passage；

Supporting part, sealing are coupled to first openend of the lid, and offer some along the lid axis Direction penetrates through the mounting hole of the supporting part；

Filter, including body, filter membrane and check valve, it is corresponding described that the body sealing is coupled to the supporting part Mounting hole, and the cavity including one end open and the venthole for connecting the cavity and the mounting hole, the filter membrane Be arranged at the cavity, the check valve is arranged at the venthole, opened with responding the air pressure of the venthole both sides or Close the venthole；

Connector, is coupled to the corresponding mounting hole of the supporting part, for connecting transfusion catheter.

Above-mentioned sealing safety head, is coupled, Yi Jidan by the sealing of the sealing mating of lid and bottle, supporting part and lid Setting to valve, has effectively obstructed the volatilization of the reagent in bottle and has been leaked in air, avoided the pollution to environment, ensure that reality The physical and mental health of personnel is tested, and reduces the caused loss of reagent volatilization, has saved cost.In addition, unidirectional response valve air pressure and It is turned on and off, compensate for the air pressure in bottle, ensure the stable gas pressure in bottle, improves the smoothness of reagent conveying.

In a wherein embodiment, the sealing safety head further includes the plug for blocking the mounting hole, described stifled Head is hermetically coupled to the mounting hole of redundancy.

In a wherein embodiment, the sealing safety head further includes seal, and the supporting part is coupled to described first The end sidewalls of openend are circumferentially arranged at the storage tank formed with storage tank, the seal, for reagent bottle bottle Mouth and the extension vias inner walls fitted seal.

In a wherein embodiment, the supporting part includes clamping part and the mounting portion being connected with the clamping part, described Mounting hole runs through the clamping part and the mounting portion, and the clamping part is circumferentially formed with annular flange, the extension passage Inner wall is equipped with the annular groove to match with the annular flange, and the annular flange is arranged in the annular groove, so that described Supporting part is fixed in the relatively described lid of axis direction of the lid.

In a wherein embodiment, the filter further includes air valve deck, and the air valve cover is arranged on the cavity, And it is located at side of the filter membrane away from the venthole, and offer the air hole for air inlet.

In a wherein embodiment, the air valve deck has card slot annular in shape towards the side of the cavity, described Air valve deck is arranged in by the card slot at the openend of the cavity, and the filter membrane is arranged at the openend of the cavity Place, the air valve cap-shaped is pressed on into the side wall for having the card slot at the circumferential edge of the filter membrane, by the filtering It is positioned at the openend of the cavity to film tensioning.

In a wherein embodiment, the sealing safety head further includes time set, and the time set is arranged at described Air valve tops.

In a wherein embodiment, the check valve has a flexibility, and including distally, near-end and therebetween extend Inlet channel, the distal end extend along the venthole radial direction, and the check valve is supported in the venthole connects The end of the cavity, it is described to be proximally located in the venthole, and it is configured to that there is response venthole both sides air pressure And the gap being turned on and off.

In a wherein embodiment, the near-end of the check valve includes two alar parts extended along venthole, described in two Alar part is oppositely arranged, and be configured to it is normally closed, and when responding the venthole there is negative pressure close to first open end side Form the gap.

Reagent bottle, including bottle and safety head is sealed described above, the lid is threadedly connected to the opening of the bottle Place.

Brief description of the drawings

Fig. 1 is the structure diagram of the reagent bottle in one embodiment of the utility model；

Fig. 2 is the profile of the reagent bottle shown in Fig. 1；

Fig. 3 is the structure diagram of the sealing safety head of the reagent bottle shown in Fig. 1；

Fig. 4 is the profile of the sealing safety head shown in Fig. 3.

Embodiment

For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings State.The preferred embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms Realize, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments makes to the utility model The understanding of disclosure more thorough and comprehensive.

It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ", " right side " and similar statement are for illustrative purposes only.

Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to the technology of the utility model The normally understood implication of technical staff in domain is identical.It is simply in the term used in the description of the utility model herein The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " include The arbitrary and all combination of one or more relevant Listed Items.

As shown in Figure 1, Figure 2 and shown in Fig. 4, the sealing safety head 10 in one embodiment of the utility model, including lid 12, branch Support part 14, filter 16 and connector 18.

The lid 12 includes the first openend 122, the second openend 124 and in the first openend 122 and the second openend The extension passage (figure is not marked) extended between 124, supporting part 14 is coupled to the first openend 122 of lid 12, and if offering The dry mounting hole along 12 axis direction of lid perforation supporting part 14 (figure is not marked).Filter 16 includes body 162, filter membrane 164 And check valve 166, body 162 are coupled to 14 corresponding mounting hole of supporting part, and the cavity 1622 including one end open and it is used for Connect the venthole 1624 of cavity 1622 and mounting hole.Filter membrane 164 is arranged at cavity 1622, and check valve 166 is arranged at ventilation Hole 1624, opens or closes venthole 1624, connector 18 is coupled to supporting part with the air pressure in response to 1624 both sides of venthole 14 corresponding mounting holes, for connecting transfusion catheter 30.

In chemical experiment, which is used for the opening for being hermetically coupled to the bottle 20 of reagent bottle 100 Place, transfusion catheter 30 is arranged in connector 18, and is stretched into from the second openend 124 of lid 12 in bottle 20, to extract bottle Reagent in 20.It is coupled since the opening of sealing safety head 10 and bottle 20 seals, then the mistake of reagent is aspirated in transfusion catheter 30 Cheng Zhong, bottle 20 is interior to produce negative pressure, i.e. pressure in bottle 20 is less than the pressure of the solvent vapor liquid equilibrium in bottle 20, so that Make the reagent in bottle 20 can not be smooth, or even can not the output out of bottle 20.And check valve 166 is according to 1624 both sides of venthole Air pressure change open venthole 1624, then compensate for the pressure in bottle 20, reagent is smoothly exported.

Specific in an embodiment, which includes opening and locking states, when in bottle 20 Air pressure is less than preset pressure value, and check valve 166 is in opening, for compensating the air pressure in bottle 20.When in bottle 20 Air pressure is greater than or equal to preset pressure value, and check valve 166 is in locking states.That is, the bottle during reagent is aspirated Atmospheric pressure value in body 20 reaches above-mentioned condition, and check valve 166 is opened, and stops suction reagent, and atmospheric pressure value is greater than or equal to foregoing Preset pressure value, then 166 locking of check valve.

Wherein, which is arranged at cavity 1622, air-flow is first passed around filtering, then enter by check valve 166 In bottle 20, the reagent in bottle 20 is avoided to be contaminated.Specifically, which is micropore filtering film 164, for preventing Small particle dust, moisture in air enter in bottle, maintain reagent purity in bottle 20 constant

In this way, be coupled by the sealing mating of lid 12 and bottle 20, supporting part 14 and the sealing of lid 12, and unidirectionally The setting of valve 166, has effectively obstructed the volatilization of the reagent in bottle 20 and has been leaked in air, avoided the pollution to environment, ensure The physical and mental health of experimenter, and loss caused by reducing reagent volatilization, have saved cost.In addition, check valve 166 responds Air pressure and be turned on and off, compensate for the air pressure in bottle 20, ensure the stable gas pressure in bottle 20, improve reagent conveying Smoothness.

Specifically, the lid 12, supporting part 14, filter 16 and connector 18 are using acid and alkali-resistance, organic solvent-resistant Material is made, for example, polytetrafluoroethylene (PTFE) (PTFE), TFM, perfluoro alkoxy (PFA) etc., so as to improve the sealing safety head 10 Reliability and service life.It is understood that material used by lid 12, supporting part 14, filter 16 and connector 18 Material includes but not limited to above-mentioned different materials.

In one embodiment, sealing safety head 10 further includes the plug 19 for blocking mounting hole, and plug 19 is hermetically It is coupled to the mounting hole of redundancy.Specifically, multiple mounting holes are offered on supporting part 14, the sealing of body 162 is coupled to wherein one A mounting hole, connector 18 are coupled to the mounting hole of respective numbers according to the actual requirements, and the sealing of plug 19 is coupled to remaining peace Fill hole.In this way, the position relationship of can be arranged according to actual conditions filter 16, connector 18, and with plug 19 by the peace of redundancy Hole closure is filled, test equipment ana conduit arrangement is more regular, is not easy to wind, improves ease of use.

It should be noted that the plug 19 is similar with the structure of connector 18, difference is that connector 18 can will be defeated Fluid catheter 30 positions and introduces bottle 20, and plug 19 is used to block mounting hole, and therefore, the structure of plug 19 can refer to following tools Explanation of the body to connector 18.

In one embodiment, supporting part 14 includes clamping part 142 and the mounting portion 144 being connected with clamping part 142, card If portion 142 is circumferentially equipped with the annular groove to match with annular flange 1422 formed with annular flange 1422, extension vias inner walls (figure is not marked), annular flange 1422 is arranged in annular groove, so that axis direction opposite lid 12 of the supporting part 14 in lid 12 It is fixed.Further, the radial dimension of clamping part 142 and the radial dimension of extension passage match, the radial dimension of mounting portion 144 Match with the radial dimension of the opening of the first openend 122 of lid 12.In the assembling of sealing safety head 10, supporting part 14 Extension passage is penetrated from the second openend 124 of lid 12, mounting portion 144 is stretched out from the opening of the first openend 122, clamping part 142 are held in the first openend 122 of lid 12 and spacing, and annular flange 1422 is directed at annular groove and is caught in.In this way, assembly and disassembly are just Profit, can effectively lift the speed that experimenter replaces each element, improve work efficiency.In addition, annular flange 1422 and annular are recessed Groove coordinates, and supporting part 14 can be made to rotate in a circumferential direction with respect to lid 12, further easy to the arrangement of test equipment conduit, be not easy to wind, Improve ease of use.

Specific in an embodiment, the lid 12 is cylindrical, and the opening radial dimension of its first openend 122 is small In the radial dimension of the opening of the second openend 124, accordingly, clamping part 142 and mounting portion 144 are also cylindrical, mounting hole Through clamping part 142 and mounting portion 144, clamping part 142 is in extension passage, and mounting portion 144 stretches out lid 12, easy to filter Device 16, connector 18 and plug 19 are installed.

In one embodiment, sealing safety head 10 further includes seal 11, and supporting part 14 is coupled to the first openend 122 End sidewalls be circumferentially arranged at storage tank 146 formed with storage tank 146, seal 11, for 20 bottleneck of bottle and prolonging Stretch vias inner walls fitted seal.Specifically, which is sealing ring, which is arranged in storage tank 146, works as lid After body 12 and 20 bottleneck close-fitting of bottle, seal 11 is subject to 146 inner wall of storage tank, 20 bottleneck of bottle and extension vias inner walls Crimp, so as to play the role of sealing.In this way, improving sealing safety head 10 is tight with the sealing after 20 bottleneck of bottle Property, it create a further reduction reagent volatilization leakage and cause the influence caused by environment and experimenter's physical and mental health.

In one embodiment, body 162 is threadedly connected to supporting part 14.Specifically, inner wall of the hole installing is equipped with internal thread, 162 bottom of body is equipped with external screw thread, and body 162 is threadedly connected in mounting hole.In this way, it is easy to disassemble, it is easy-to-use.It should manage Solution, body 162 are threadedly connected in mounting hole, its degree of cooperation should be relatively tight, to ensure preferable air-tightness, prevents reagent Volatilization leakage.

Further, body 162 includes filter house 161, pars intermedia 163 and connecting portion 165, the filter house 161, centre Portion 163 and connecting portion 165 are in turn connected to form a shell-like structure, and cavity 1622 is arranged on filter house 161, during venthole 1624 is arranged on Between portion 163 and connecting portion 165, and penetrate through both connected with cavity 1622.Specifically, filter house 161 is substantially in inverted cone shape, middle Portion 163 is cylindrical, and connecting portion 165 matches in cylinder with the installation hole shape on supporting part 14, size.Filter house 161 is remote There is the opening that is connected with cavity 1622 from one end of pars intermedia 163, for air inlet, filter membrane 164 is arranged at filter house 161 Openend, for filtering external air, dust and impurity, prevent the impurity in extraneous air from entering pollution examination in bottle 20 Agent.

It should be appreciated that filter house 161 is in back taper, make air-flow that there is certain gathering after the filtering of filter membrane 164, Stabilization, smoothly air-flow are formed, so as to ensure 166 smooth unlatching of check valve and closing, it is improved and responds the sensitivity of air pressure.

Further, filter 16 further includes air valve deck 167, and air valve deck 167 covers at the cavity 1622, and Positioned at side of the filter membrane 164 away from the venthole 1624, and offer the air hole 1672 for air inlet.Specifically Ground, air valve deck 167 have card slot annular in shape (figure is not marked) towards the side of cavity, and air valve deck 167 is set by card slot card At the openend of cavity 1622, filter membrane is arranged at the openend of cavity, and air valve deck 167 is formed with foregoing card slot Side wall is pressed at the circumferential edge of filter membrane 164, and filter membrane 164 is positioned at the openend of cavity 1622 with being tensioned. More specifically, air valve deck 167 has the tendons as card slot side wall towards the side of cavity 1622, filter membrane 164 is arranged at At the openend of cavity 1622, tendons are pressed at the circumferential edge of filter membrane 164, are positioned at cavity to the tensioning of filter membrane 164 At 1622 openend.

In this way, filter membrane 164 is positioned at the openend of cavity 1622 by air valve deck 167, and prevent larger Impurity enters in cavity 1622, causes the damage of filter membrane 164, improves the tight reliability of sealing safety head 10.

Further, sealing safety head 10 further includes time set 13, and time set 13 is arranged at air valve deck 167 and pushes up Portion, for timing.Specifically, which is time labeling, the time set 13 be equipped with button and when studding, press Lower button, when studding start timing, to show the used time, so that the usage time of recording filter 16.In this way, serve as Filter 16 uses after a certain period of time, and Timing reminds user to replace, so as to ensure the strainability of air.

It should be appreciated that to ensure leakproofness and entering the clean level of air in bottle 20, it is necessary to replace in time Filter 16, so as to avoid impurities accumulation, and is subject to the corrosion of volatile reagent and damages, influence strainability.

In one embodiment, which is fabricated from a flexible material, and is internally provided with controlled valve, with corresponding gas Press and be turned on and off, for example, the check valve 166 can specifically be made of one of materials such as silica gel, fluorubber, nitrile rubber.Into One step, which includes distal end, near-end and the inlet channel extended therebetween, distally along 1624 footpath of venthole Extend to direction, check valve 166 is supported in the end that venthole 1624 connects cavity 1622, is proximally located at venthole 1624 It is interior, and be configured to the gap being turned on and off in response to 1624 both sides air pressure of venthole.

Specific in an embodiment, the near-end of the control valve includes two alar parts extended along venthole 1624, and two A alar part is oppositely arranged, and be configured to it is normally closed, and respond venthole 1624 there is negative pressure close to 122 side of the first openend when Form gap.That is, when producing negative pressure in bottle 20, then under the action of external atmosphere pressure, two alar parts are strutted, so that shape Into the gap of ventable stream.Wherein, which is in duckbill, that is, is in the laminated structure similar to duckbilled.

It is noted that the distal end of the check valve 166 extends along 1624 radial direction of venthole, to be carried for check valve 166 For support, it is specifically that the distal end of check valve 166 forms a flange, makes check valve 166 in the axial limiting of venthole 1624.

It should be appreciated that size of the radial dimension of the check valve 166 slightly larger than the internal diameter of venthole 1624, due to list It is fabricated from a flexible material to valve 166, then when check valve 166 is installed in venthole 1624, its outer wall is closely against venthole 1624 Inner wall, so as to fulfill good sealing.

In one embodiment, which has a connection for running through 18 both ends of connector along mounting hole axis direction Hole 182, the connector 18 are threadedly connected to the mounting hole on supporting part 14.Further, which is coupled to mounting hole Circumferentially to have be in substantially coniform contraction front for end, the inner wall of the hole installing with the mating surface being in contact with contraction front, The shape of the mating surface and the shape of contraction front match.In this way, when connector 18 is tightened in mounting hole, connector 18 Taper contraction front is tightened by mating surface, so that the transfusion catheter 30 through connector 18 is fastened, so as to prevent infusion from leading The junction gas leakage of pipe 30 and connecting hole 182.In this way, it ensure that the leakproofness of sealing safety head 10.

Further, which is made of the material of acid and alkali-resistance and organic solvent-resistant, for example, polytetrafluoroethylene (PTFE) (PTFE), TFM, perfluoro alkoxy (PFA) etc..In this way, ensure the service life of connector 18.

Further, the top of connector 18, which is equipped with, twists hand 184 (see Fig. 3), and it is in polygon that this, which twists hand 184,.In this way, just The mounting hole on supporting part 14 is threaded in or out in user's operation connector 18.Specific in an embodiment, this twists hand 184 be in eight side plum blossom-shapeds.

Further, the end of the connecting hole 182 away from lid 12 formed with towards 182 central axes of connecting hole tilt prolong The guide surface stretched.In this way, entering the connecting hole 182 easy to transfusion catheter 30, the convenience used is improved.

It is emphasized that connector 18 is equipped with connecting hole 182, introduced easy to transfusion catheter 30 in bottle 20, plug 19 For blocking mounting hole, its outline shape, size are identical with connector 18, and difference is that it has and runs through its through hole.

Based on above-mentioned sealing safety head 10, the utility model also provides a kind of reagent bottle 100, which includes Bottle 20 and above-mentioned sealing safety head 10, the lid 12 are threadedly connected to the opening of bottle 20.

Specifically, the extension vias inner walls of lid 12 are equipped with internal thread, and the opening of bottle 20 is circumferentially with external screw thread, should Lid 12 is threadedly connected to the opening of bottle 20.

, below will be with specific embodiment to the sealing safety head 10 to be further understood that the technical solution of the utility model Assembling and illustrated using process.

Assembling：Seal 11 is arranged in the annular groove of supporting part 14, supporting part 14 is arranged in lid 12, then Lid 12 and 20 whorl of bottleneck of bottle are coupled.Then filter 16, connector 18 and 19 screw thread of plug are coupled to supporting part Corresponding mounting hole on 14, completes assembling.

Use：Before experiment, connector 18 is unscrewed from supporting part 14 and is removed, by transfusion catheter 30 from connector 18 Between connecting hole 182 penetrate, after transfusion catheter 30 is inserted into the mounting hole of supporting part 14, lid 12 is tightened against to the bottle of bottle 20 Mouthful.After transfusion catheter 30 to be finally inserted into the bottom of bottle 20, connector is tightened in supporting part 14, you can starts normal extract Work.

Above-mentioned sealing safety head 10 and bottle 20, sealing safety head 10 and the opening sealing of bottle 20 are coupled, then are infusing During pipe suction reagent, negative pressure is produced in bottle 20, is opened by check valve 166 when compensating air pressure in bottle 20.Such as This, during aspirating reagent, ensures the stable gas pressure in bottle 20, improves the smoothness of the solvent delivery in bottle 20. In addition, being filtered by filter membrane 164, the reagent in bottle 20 is avoided to be contaminated.

Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope that this specification is recorded all is considered to be.

Embodiment described above only expresses the several embodiments of the utility model, its description is more specific and detailed, But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.

Claims (10)

1. seal safety head, it is characterised in that including：

Lid, including the first openend, the second openend and what is extended between the first openend and second openend prolong Stretch passage；

Supporting part, sealing are coupled to first openend of the lid, and offer some along the lid axis direction Penetrate through the mounting hole of the supporting part；

Filter, including body, filter membrane and check valve, the body sealing are coupled to the corresponding installation of the supporting part Hole, and the cavity including one end open and the venthole for connecting the cavity and the mounting hole, the filter membrane are set In the cavity, the check valve is arranged at the venthole, opens or closes to respond the air pressure of the venthole both sides The venthole；

Connector, is coupled to the corresponding mounting hole of the supporting part, for connecting transfusion catheter.

2. sealing safety head according to claim 1, it is characterised in that the sealing safety head is further included for blocking institute The plug of mounting hole is stated, the plug is hermetically coupled to the mounting hole of redundancy.

3. sealing safety head according to claim 1, it is characterised in that the sealing safety head further includes seal, institute State supporting part and be coupled to the end sidewalls of first openend circumferentially formed with storage tank, the seal is arranged at described Storage tank, for reagent bottle bottleneck and it is described extension vias inner walls fitted seal.

4. sealing safety head according to claim 1, it is characterised in that the supporting part include clamping part and with the card If the mounting portion of portion's connection, the mounting hole run through the clamping part and the mounting portion, the clamping part circumferentially formed with Annular flange, the extension vias inner walls are equipped with the annular groove to match with the annular flange, and the annular flange is arranged in The annular groove, so that the supporting part is fixed in the relatively described lid of axis direction of the lid.

5. safety head is sealed according to Claims 1 to 4 any one of them, it is characterised in that the filter further includes air Valve deck, the air valve cover is arranged on the cavity, and is located at side of the filter membrane away from the venthole, and offers Air hole for air inlet.

6. sealing safety head according to claim 5, it is characterised in that the air valve deck is towards the side of the cavity With card slot annular in shape, the air valve deck is arranged in by the card slot at the openend of the cavity, the filter membrane It is arranged at the openend of the cavity, the air valve cap-shaped presses on the week of the filter membrane into the side wall for having the card slot To edge, the filter membrane is positioned at the openend of the cavity with being tensioned.

7. sealing safety head according to claim 5, it is characterised in that the sealing safety head further includes time set, The time set is arranged at the air valve tops.

8. safety head being sealed according to Claims 1 to 4 any one of them, it is characterised in that the check valve has flexibility, and Extend including distal end, near-end and the inlet channel extended therebetween, the distal end along the venthole radial direction, will The check valve is supported in the end that the venthole connects the cavity, described to be proximally located in the venthole, and by structure Make the gap to be turned on and off with response venthole both sides air pressure.

9. sealing safety head according to claim 8, it is characterised in that the near-end of the check valve includes two along ventilation The alar part of hole extension, two alar parts are oppositely arranged, and are configured to normally closed, and are responding the venthole close to described the One open end side forms the gap when having negative pressure.

10. reagent bottle, it is characterised in that seal safety head including bottle and as claimed in any one of claims 1 to 9 wherein, institute State the opening that lid is threadedly connected to the bottle.