CN219928574U

CN219928574U - Fluid container system

Info

Publication number: CN219928574U
Application number: CN202320803446.2U
Authority: CN
Inventors: 贾建东; 谢铭翔; 陆康; 张漫
Original assignee: Hangzhou Cobetter Filtration Equipment Co Ltd
Current assignee: Hangzhou Cobetter Filtration Equipment Co Ltd
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2023-10-31
Anticipated expiration: 2033-04-11

Abstract

The utility model discloses a fluid container system, which belongs to the field of fluid containers and solves the problem that a retainer is easy to damage, and the fluid container system comprises: the container body is provided with a containing cavity and an opening communicated with the containing cavity; a liner disposed in the cavity for containing a fluid; a liner engagement assembly having a dip channel therethrough for a dip tube to extend into the liner; the liner engagement assembly comprises: a liner connection portion for connecting the liner, the liner connection portion having an assembly hole; and a retainer installed at the opening, the retainer being inserted into the fitting hole to retain the liner connection portion at the opening. The retainer is inserted into the assembly hole to be matched with the lining connecting part, and the form of the retainer is basically not changed in the matching process or the detaching process of the retainer, so the retainer is not easy to damage, and has longer service life.

Description

Fluid container system

[ field of technology ]

The present utility model relates to the field of fluid containers, and more particularly to a fluid container system.

[ background Art ]

In some applications it is desirable to use fluids such as acids, bases, organic solutions, inorganic solutions, pharmaceutical fluids, etc., which typically require a specific container for storage. In view of the cost of the container, a liner is provided in the container that can hold fluids so that the container can be reused and can hold different fluids, the liner having an opening at its upper end for access to the fluids.

Typically, the liner (now commonly disposable bag) is made of a flexible material which, if placed directly within the container, deforms causing the fluid within the liner to leak into the container and contaminate the container, thus securing the liner to the open portion of the container and hanging the liner in the container. The liner is provided with a liner attachment portion to which the liner is attached, and in particular, the liner is welded to the bottom end of the liner attachment portion, and the container further includes a retainer removably attachable to the liner attachment portion such that the retainer is removable from the liner attachment portion for reuse, since the old integrally attached liner attachment portion and liner are discarded after the retainer is separately removed, and a new liner attachment portion and liner are replaced. In the prior art, as in patent JP1994099000B2, a liquid chemical treatment device is disclosed, wherein a retainer is a hoop for holding a lining connecting portion, a hinge structure is arranged on the hoop so that the hoop can be opened and closed to hold or release the lining connecting portion, at this time, the lining connecting portion is inserted in the hoop, but the hinge structure is easy to damage due to repeated opening and closing of the retainer, so that the service life of the hoop is shorter.

[ utility model ]

The utility model aims to overcome the defects of the prior art and provide a fluid container system which solves the problem that a retainer is easy to damage.

In order to solve the technical problems, the utility model adopts the following technical scheme: a fluid container system comprising:

the container body is provided with a containing cavity and an opening communicated with the containing cavity;

a liner disposed in the cavity for containing a fluid;

a liner engagement assembly having a dip channel therethrough for a dip tube to extend into the liner;

the liner engagement assembly comprises:

a liner connection portion for connecting the liner, the liner connection portion having an assembly hole;

and a retainer installed at the opening, the retainer being inserted into the fitting hole to retain the liner connection portion at the opening.

On the basis of the scheme, the retainer is provided with a through hole communicated with the assembly hole, the through hole and the assembly hole form the drawing channel, and the retainer and the inner wall of the assembly hole are arranged in a sealing mode.

On the basis of the scheme, the lining connecting part comprises a first annular component and a second annular component, the first annular component encloses the drawing channel, and the first annular component and the second annular component enclose the assembly hole isolated from the drawing channel.

On the basis of the scheme, the first annular component and the second annular component form detachable sealing connection; alternatively, the first annular member and the second annular member are integrally formed.

In addition to the above, the liner engagement assembly further comprises a locking structure for limiting relative displacement of the retainer and the liner attachment portion in the direction of the assembly bore axis.

On the basis of the scheme, the locking structure comprises a first stop part arranged on one of the lining connecting part and the retainer and a second stop part arranged on the other, and the first stop part and the second stop part are propped against each other in the axial direction of the assembly hole so as to limit the relative displacement of the retainer and the lining connecting part.

On the basis of the scheme, the locking structure comprises a first thread arranged on the retainer and a second thread arranged on the inner wall of the assembly hole and matched with the first thread.

On the basis of the scheme, the locking structure comprises a limiting block arranged on one of the lining connecting part and the retaining piece and a limiting groove arranged on the other one, wherein the limiting groove comprises an insertion section and a limiting section, and the limiting block relatively rotates after being inserted into the insertion section so as to slide into the limiting section.

On the basis of the scheme, the retainer is in interference fit with the assembly hole to limit relative displacement of the retainer and the assembly hole in the axial direction of the assembly hole.

On the basis of the scheme, the retainer is arranged at the opening in a sealing way, an inflation space is formed between the lining and the inner wall of the containing cavity, and the retainer is provided with a vent hole communicated with the inflation space so as to allow external gas to enter the inflation space to squeeze the lining to enable fluid to enter the dip tube.

The utility model has the beneficial effects that:

the fluid container system disclosed by the utility model comprises a container body and a lining, wherein the lining is arranged in the containing cavity to contain fluid, so that the fluid cannot contact the inner wall of the containing cavity to prevent the container body from being polluted, and the container body can be reused. The liner engagement assembly is for connecting the liner and has a dip channel through which a user may access fluid through the dip tube to extend into the liner without removing the liner from the container. The liner engagement assembly includes a liner attachment portion and a retainer member that is coupled to the liner by the liner attachment portion and that is mated with the liner attachment portion to retain the liner in the opening.

The retainer is mounted at the opening so as to be itself held in the open position, and the liner attachment portion is held in the open position by engagement with the retainer. The retainer is inserted into the assembly hole to be matched with the lining connecting part, the retainer can be pulled out of the assembly hole to be detached from the lining connecting part, and the form of the retainer is basically not changed in the matching process or the detaching process of the retainer and is not easy to damage, so that the retainer has a longer service life.

Further, the retainer is provided with a through hole communicated with the assembly hole, the through hole and the assembly hole form the drawing channel, and the retainer and the inner wall of the assembly hole are arranged in a sealing mode. Through this scheme, make the pilot hole not only can be used for installing the holder, can also constitute with the through-hole and draw the passageway, owing to there is the cooperation relation between the inner wall of holder and pilot hole, set up the two as sealed cooperation can avoid the fluid can enter into between holder and the pilot hole, also can prevent simultaneously that the space intercommunication in appearance chamber and the lining.

Further, the liner connection includes a first annular member and a second annular member, the first annular member circumscribing the scoop channel, the first annular member and the second annular member circumscribing the mounting hole therebetween that is isolated from the scoop channel. In this scheme, the pilot hole sets up around the pilot channel, and because pilot channel keeps apart with the pilot hole, consequently can prevent that fluid from entering into the pilot hole and polluting the holder, first annular component can play the effect of protection holder.

Further, the liner engagement assembly further includes a locking structure for limiting relative displacement of the retainer and the liner attachment portion in the direction of the mounting bore axis. The locking structure can maintain the stability of the fluid container system, so that the retainer and the lining connecting part are kept in a matched state, and the retainer and the lining connecting part are prevented from being separated to influence the preservation of the lining on the fluid.

Further, the retainer is installed at the opening in a sealing manner, an inflation space is formed between the lining and the inner wall of the cavity, and a vent hole communicated with the inflation space is formed in the retainer so as to allow external gas to enter the inflation space to squeeze the lining to enable fluid to enter the dip tube. The vent hole is communicated with the inflation space, so that the pressure in the inflation space can be increased by introducing external air into the inflation space through the vent hole, the liner is extruded to deform, and internal fluid can be extruded into the dip tube, so that the fluid in the liner can be obtained through the dip tube, and the pump body is not required to be polluted by connecting the dip tube with the pump body. The retainer is in sealing fit with the opening, so that the air in the inflation space can be prevented from passing through the retainer and the opening to influence the fluid suction.

These features and advantages of the present utility model will be disclosed in detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The utility model is further described with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a fluid container system according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a fluid containment system in accordance with an embodiment of the present utility model;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

FIG. 4 is a schematic view of the construction of a liner engagement assembly in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic structural view of a liner joint assembly having a first annular member in accordance with an embodiment of the present utility model;

FIG. 6 is a schematic illustration of another liner engagement assembly having a first annular member in accordance with an embodiment of the present utility model;

FIG. 7 is a schematic illustration of another liner engagement assembly having a first annular member in accordance with an embodiment of the present utility model;

FIG. 8 is a schematic illustration of another liner engagement assembly having a first annular member in accordance with an embodiment of the present utility model;

FIG. 9 is a schematic illustration of the connection of a retainer and liner connection in an embodiment of the present utility model;

FIG. 10 is a schematic illustration of another connection of the retainer and liner connection in accordance with an embodiment of the present utility model;

FIG. 11 is a schematic view of a retainer according to an embodiment of the present utility model;

FIG. 12 is a schematic view of the structure of the lining connecting section according to the embodiment of the present utility model.

Reference numerals:

container body 100, container cavity 110, opening 120, shoulder 121, neck 130, cap 140, drawing hole 141, opening 142, sealing cap 150;

liner 200, plenum 210;

drawing channel 300, vent 310, liner attachment 320, assembly hole 321, first annular member 322, second annular member 3221, engagement component 3222, second threads 323, second stop 324, limit slot 325, insertion section 3251, limit section 3252, retainer 330, through hole 331, first threads 332, first stop 333, stop block 334, seal ring 340;

dip tube 400.

[ detailed description ] of the utility model

The technical solutions of the embodiments of the present utility model will be explained and illustrated below with reference to the drawings of the embodiments of the present utility model, but the following embodiments are only preferred embodiments of the present utility model, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present utility model.

The appearances of the phrases such as "exemplary," "some embodiments," and the like in the following text are meant to be "serving as examples, embodiments, or illustrative," and any embodiment described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, it will be appreciated by those skilled in the art that the present disclosure may be practiced without some of these specific details.

Referring to fig. 1-12, an embodiment of the present utility model discloses a fluid container system comprising a container body 100, a liner 200, and a liner engagement assembly, the container body 100 comprising a vessel 110 and an opening 120 communicating with the vessel 110, the liner 200 being for containing a fluid and being disposed within the vessel 110, the liner engagement assembly being mounted at the opening 120 and being connected to the liner 200, the liner engagement assembly having a dip channel 300 communicating with an interior space of the liner 200, the dip channel 300 being for a dip tube 400 to pass therethrough to dip the fluid into the liner 200.

Liner 200 is made of a flexible material, typically a disposable bag, that can be inserted into cavity 110 through opening 120 when fluid is not being contained therein, and then fluid is injected into liner 200, and liner 200 can be directly removed from container body 100 after fluid within liner 200 is removed. The liner 200 is provided to prevent the fluid from directly contacting the inner wall of the container 110 to prevent the container body 100 from being contaminated, and thus the container body 100 can be reused. When it is desired to draw fluid, a user may extend through the dip tube 400 through the dip channel 300 to access the liner 200 without removing the liner 200 from the container body 100.

If fluid is drawn from the dip tube 400, suction needs to be provided to the dip tube 400, such as a pump body, which may cause the fluid to have to pass through the pump body and contaminate the pump body. To solve this problem, a vent 310 may be provided in the liner coupling assembly, an plenum 120 is formed between the liner 200 and the cavity 110, and the vent 310 communicates with the plenum 120, so that the pressure in the plenum 120 may be increased by passing ambient air into the plenum 120 through the vent 310 to squeeze the liner 200 to deform the liner 200 to squeeze the fluid therein into the dip tube 400, thereby allowing the fluid in the liner 200 to be captured through the dip tube 400. The liner engagement assembly is in sealing engagement with the opening 120 to prevent air within the plenum 120 from passing between the liner engagement assembly and the opening 120 to affect fluid draw.

The periphery of the opening 120 extends upwards to form a bottle neck 130, the fluid container further comprises a bottle cap 140, the bottle cap 140 is matched with the bottle neck 130 to press the liner joint assembly, a drawing hole 141 for a drawing tube 400 to penetrate is formed in the bottle cap 140, the drawing tube 400 penetrates through the drawing hole 141 and abuts against the bottle cap 140 around the drawing hole 141, and air and fluid in the liner 200 can be prevented from leaking through a gap between the drawing channel 300 and the drawing tube 400.

Wherein the liner coupling assembly includes a liner coupling portion 320 and a holder 330, the liner coupling portion 320 is used to couple the liner 200, and the liner coupling portion 320 and the liner 200 may be coupled by ultrasonic welding, heat sealing, or the like, so that fluid of the liner 200 may flow out only through the pumping channel 300 to the outside. The vent 310 is disposed on the retainer 330, the retainer 330 is detachably connected to the liner connection portion 320, and the retainer 330 is mounted at the opening 120 for retaining the liner connection portion 320 at the opening 120, so as to prevent the liner 200 from freely falling into the cavity 110 to deform and overflow the fluid, and when the fluid in the liner 200 is removed, the retainer 330 can be detached from the liner connection portion 320 for reuse.

Unlike the prior art, in the present utility model, the liner connection part 320 is provided with the assembly hole 321 for installing the holder 330, and the holder 330 is inserted into the assembly hole 321, and the shape of the holder 330 is not changed during the matching process or the detachment process of the two, so that the holder 330 is not easily damaged, and has a long service life.

Referring to fig. 4, 9 to 12, in one embodiment of the present utility model, based on the above-described embodiment, the liner connection part 320 is penetrated up and down to form the fitting hole 321, the holder 330 is penetrated up and down to form the through hole 331, the holder 330 is inserted into the fitting hole 321 such that the through hole 331 communicates with the fitting hole 321, the drawing channel 300 is composed of the through hole 331 and the fitting hole 321, and the dip tube 400 may sequentially pass through the through hole 331 and the fitting hole 321 into the liner 200.

In the prior art, since the retainer is an outer race embracing the liner connection portion, the tapping channel is formed only by the liner connection portion 320, whereas in the present embodiment, the tapping channel 300 is composed of the retainer 330 and the liner connection portion 320 spliced together to allow the retainer 330 and the liner connection portion 320 to be designed to be smaller in size. Specifically, if a length L of the dip channel 300 is to be formed, implemented in the prior art, the liner connection portion needs to be at least L in size; in the present embodiment, however, the liner attachment portion 320 and the retainer 330 may both be sized to be less than L. And the liner attachment portion 320 and liner 200 are typically disposable components, the liner attachment portion 320 is discarded along with the liner 200 after the fluid within the liner 200 has been removed, and the amount of material required to manufacture the liner attachment portion 320 can be reduced after the aspects of the present embodiments are employed to reduce the cost of the fluid container system.

A sealing ring 340 is provided between the holder 330 and the inner wall of the fitting hole 321, and the sealing ring 340 can provide sealing for the holder 330 and the fitting hole 321 in the circumferential direction of the drawing channel 300, prevent fluid from entering between the holder 330 and the fitting hole 321, and prevent the cavity 110 from communicating with the space in the liner 200, so that the liner 200 can deform to extrude the fluid out of the dip tube 400 when the pressure in the plenum 120 increases. The sealing ring 340 is made of rubber or silica gel materials, has deformation capability, and the sealing ring 340 is pressed between the retaining piece 330 and the inner wall of the assembly hole 321 to generate deformation, is tightly attached to the inner wall of the assembly hole 321 and the retaining piece 330, can generate larger friction force, improves the matching stability between the retaining piece 330 and the lining connecting part 320, and avoids relative shaking of the retaining piece 330 and the lining connecting part 320.

Referring to fig. 5 to 8, unlike the above-described embodiment, in another embodiment of the present utility model, the liner connection part 320 includes a first annular member 322, a second annular member 3221, and a joint part 3222 for connecting the liner 200, the first annular member 322 has upper and lower ends penetrating to form the drawing channel 300, the second annular member 3221 is provided outside the first annular member 322 and encloses with the first annular member 322 a fitting hole 321 provided around the drawing channel 300, and the drawing channel 300 is isolated from the fitting hole 321, so that it is possible to prevent fluid from entering the fitting hole 321 to contaminate the holder 330.

The holder 330 has an annular structure and has a through hole 331 penetrating therethrough up and down, and the first annular member 322 is inserted into the through hole 331 after the holder 330 is fitted with the liner connection portion 320. And the first ring member 322 extends to the upper end of the through hole 331, and may be flush with the upper end of the through hole 331 or slightly higher or lower than the upper end of the through hole 331, so as to enhance the protection effect of the holder 330.

As shown in fig. 5, second annular member 3221 is integrally formed with engagement component 3222, first annular member 322 and second annular member 3221 form a releasable sealing connection, first annular member 322 being connected to an inner annular wall of second annular member 3221. The first annular member 322 can be detached from the second annular member 3221 for reuse without contacting the fluid, and the sealed connection of the first annular member 322 and the second annular member 3221 can also prevent the fluid from entering the assembly hole 321.

The preferred form of releasable connection is a threaded engagement by which the first annular member 322 needs to be rotated to disengage it from the second annular member 3221, but in normal use, the removal of artifacts is achieved with little effort on the first annular member 322 in the direction of its circumference, and the stability of the first annular member 322 is high. And by threaded engagement, a circumferential seal can be formed between the inner annular wall of the second annular member 3221 after the first annular member 322 is assembled in place. Of course, a sealing ring 340 may be provided between the first annular member 322 and the second annular member 3221 to enhance a sealing effect therebetween, so as to avoid leakage points of the first annular member 322 or the second annular member 3221 due to local defects.

As shown in fig. 7, unlike fig. 5, the second annular member 3221 is integrally formed with the joint part 3222, the first annular member 322 and the second annular member 3221 form a detachable sealing connection, the first annular member 322 is connected to the outer wall of the second annular member 3221, and the holder 330 is detachably reused.

As shown in fig. 6, unlike fig. 5 and 7, the first annular member 322 and the second annular member 3221 are integrally formed, and thus, there is no communication between the drawing channel 300 and the fitting hole 321, which facilitates the assembly of the liner joint. In fig. 6, first annular member 322 is formed on the inner annular wall of second annular member 3221.

As shown in fig. 8, unlike fig. 6, the first annular member 322 is formed on the outer annular wall of the second annular member 3221.

Referring to fig. 5 to 12, in one embodiment of the present utility model, the liner engagement assembly further includes a locking structure for limiting the relative displacement of the holder 330 and the liner connection portion 320 in the axial direction of the assembly hole 321, and the locking structure can maintain the stability of the fluid container system, so that the holder 330 and the liner connection portion 320 maintain the engaged state, to avoid separation of the two from affecting the preservation of the fluid by the liner 200.

As shown in fig. 5 and 9, preferably, the locking structure includes a first screw 332 provided on the holder 330, and a second screw 323 provided on the inner wall of the fitting hole 321 to be engaged with the first screw 332. By means of the threaded engagement, the retainer 330 or the liner attachment portion 320 needs to be rotated to be detached, and in normal use, the human factor is removed, so that there is little force acting on the retainer 330 or the liner attachment portion 320 in the circumferential direction, and structural stability of the liner engagement assembly can be ensured. And in the embodiment shown in fig. 5 and 7, the first annular member 322 may also be connected to the second annular member 3221 by mating with the second threads 323.

As shown in fig. 10, alternatively, the locking structure includes a first stopping portion 333 on the holder 330, and a second stopping portion 324 disposed on an inner wall of the assembly hole 321, the first stopping portion 333 is an annular rib, the second stopping portion 324 is a bump, at least three bumps are disposed on the inner wall of the assembly hole 321 along a circumferential direction of the assembly hole 321, the bumps are triangular, a side of the bump facing the axial direction of the assembly hole 321 is a slope, a lower end of the bump is a plane, during the insertion of the holder 330 into the assembly hole 321, the annular rib contacts with the slope of the bump, the slope has a guiding function to enable the annular rib to gradually deform during the insertion of the holder 330 to pass over the bump, and then resume the deformation to contact with the plane of the lower end of the bump, so as to limit the upward displacement of the holder 330 relative to the liner connection portion 320. Two annular ribs are provided on the holder 330, and a groove for assembling the seal ring 340 is formed between the two annular ribs. In addition, the setting positions of the annular convex ribs and the convex blocks can be interchanged.

As shown in fig. 11 and 12, alternatively, the locking structure includes a limit groove 325 provided on an inner wall of the assembly hole 321, and a limit block 334 provided on the holder 330, the limit groove 325 includes an insertion section 3251 and a limit section 3252, the insertion section 3251 is provided to penetrate upward with an upper end of the liner connection portion 320 so as to facilitate insertion of the limit block 334, the holder 330 is inserted into the assembly hole 321 so that the limit block 334 is inserted into the insertion section 3251, and then the holder 330 is rotated so that the limit block 334 slides into the limit section 3252, and inner walls on upper and lower sides of the limit section 3252 can abut against the limit block 334 to limit displacement of the holder 330 in an axial direction of the assembly hole 321. In addition, the setting positions of the limit groove and the limit block can be interchanged.

As shown in fig. 4, in another embodiment of the present utility model, unlike the above-described embodiment, the holder 330 is interference-fitted with the fitting hole 321 to restrict relative displacement of the two in the axial direction of the fitting hole 321.

Referring to fig. 1 to 3, in one embodiment of the present utility model, the circumferential inner wall of the bottle neck 130 protrudes toward the axial direction of the opening 120 to form the shoulder 121, the periphery of the holder 330 abuts against the shoulder 121, and the bottle cap 140 is pressed against the holder 330 after being engaged with the bottle neck 130 to tightly fit the holder 330 to the shoulder 121, so that the periphery of the holder 330 forms a seal with the shoulder 121.

In addition, the bottle cap 140 can also position the holder 330, thereby enabling the liner connection portion 320 to be positioned.

The engagement between the holder 330 and the bottleneck 130 does not require a connection structure, and the holder 330 is structurally stable, ensuring the service life of the holder 330.

Referring to fig. 1 to 3, in one embodiment of the present utility model, the bottle cap 140 is provided with an opening 142 capable of communicating with the vent hole 310 of the holder 330, and external air is introduced between the bottle cap 140 and the holder 330 through the opening 142 and enters the plenum 120 through the vent hole 310.

The cap 140 is also provided with a sealing cap 150 for sealing the opening 142 and the dip tube 400, and preventing external air, foreign substances, etc. from entering the cavity 110 or the liner 200 during the preservation of the fluid.

While the utility model has been described in terms of embodiments, it will be appreciated by those skilled in the art that the utility model is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present utility model are intended to be included within the scope of the appended claims.

Claims

1. A fluid container system comprising:

a liner disposed in the cavity for containing a fluid;

a liner engagement assembly having a dip channel therethrough for a dip tube to extend into the liner; characterized in that the liner engagement assembly comprises:

2. The fluid container system of claim 1, wherein the retainer has a through bore in communication with the mounting bore, the through bore and the mounting bore forming the scoop channel, the retainer being sealingly disposed with an inner wall of the mounting bore.

3. The fluid container system of claim 1, wherein the liner connection comprises a first annular member and a second annular member, the first annular member circumscribing the dip-channel, the first annular member and the second annular member circumscribing the mounting hole therebetween that is isolated from the dip-channel.

4. The fluid container system of claim 3, wherein the first annular member and the second annular member form a releasable sealed connection; alternatively, the first annular member and the second annular member are integrally formed.

5. The fluid container system of claim 1, wherein the liner engagement assembly further comprises a locking structure for limiting relative displacement of the retainer and the liner attachment portion in the direction of the assembly bore axis.

6. The fluid container system of claim 5, wherein the locking structure comprises a first stop portion provided on one of the liner attachment portion and the retainer, and a second stop portion provided on the other, the first stop portion and the second stop portion abutting in the direction of the mounting hole axis to limit relative displacement of the retainer and the liner attachment portion.

7. The fluid container system of claim 5, wherein the locking structure comprises a first thread provided on the retainer and a second thread provided on an inner wall of the mounting hole that mates with the first thread.

8. The fluid container system of claim 5, wherein the locking structure comprises a stop block provided on one of the liner attachment portion and the retainer, and a stop slot provided on the other, the stop slot comprising an insertion section and a stop section, the stop block being relatively rotatable after insertion into the insertion section to slide into the stop section.

9. The fluid container system of claim 1, wherein the retainer is interference fit with the mounting bore to limit relative displacement of the two in the direction of the mounting bore axis.

10. A fluid container system according to any one of claims 1 to 9, wherein the retainer is sealingly mounted at the opening, an inflation space is formed between the liner and the inner wall of the cavity, and a vent hole is provided in the retainer to communicate with the inflation space to allow ambient air to enter the inflation space to squeeze the liner into the dip tube.