CN219625342U - Flow cell and liquid feeding pipeline - Google Patents

Abstract

The utility model provides a flow cell, which comprises a flow cell body and a joint for connecting a pipeline; the interior of the flow cell body is provided with a cavity, the flow cell body is provided with a first opening communicated with the cavity and a mounting opening, the mounting opening is used for mounting the detection device, and the communication cell body is connected with a connector so that liquid in the pipeline can flow into or out of the cavity; the contact surface of the communicating pool body and the joint comprises a thread surface and an annular plane; the screw thread face is located the outside of annular plane, connects in the screw thread face, connects the annular region that seals in the annular plane in the butt, and first opening is located the inboard of annular region. In the flow cell provided by the above technical scheme, the contact surface of the joint and the flow cell body comprises an annular plane, the joint is abutted to the annular area of the seal in the annular plane, and the first opening is positioned at the inner side of the annular area, so that a gap for liquid leakage does not exist at the joint between the flow cell body and the joint, and the sealing between the flow cell body and the joint can be realized.

Description

Flow cell and liquid feeding pipeline

Technical Field

The utility model relates to the technical field of flow cells, in particular to a flow cell and a liquid conveying pipeline.

Background

In the existing flow cell, the sealing ring is adopted at the joint of the components to seal, so that the condition that the operation is inconvenient due to the fact that the sealing ring is installed exists, and the condition that the sealing effect is poor and leakage exists due to the fact that the installation position of the sealing ring is not in place exists. And the prior flow cell can only be used for acidic solution or alkaline solution due to the limitation of the material of the sealing ring.

Disclosure of Invention

The utility model aims to provide a flow cell and a feeding pipeline, which are convenient to assemble.

In a first aspect, an embodiment of the present utility model provides a flow cell, including a flow cell body, a joint for connecting a pipe; the interior of the flow cell body is provided with a cavity, the flow cell body is provided with a first opening communicated with the cavity and a mounting opening, the mounting opening is used for mounting the detection device, and the communication cell body is connected with a connector so that liquid in the pipeline can flow into or out of the cavity; the contact surface of the communicating pool body and the joint comprises a thread surface and an annular plane; the screw thread face is located the outside of annular plane, connects in the screw thread face, connects the annular region that seals in the annular plane in the butt, and first opening is located the inboard of annular region.

In the flow cell provided by the above technical scheme, the contact surface of the connector and the flow cell body comprises an annular plane, the connector is abutted to the annular area which is closed in the annular plane, and the first opening is positioned at the inner side of the annular area, so that a gap for liquid leakage does not exist at the joint between the flow cell body and the connector. That is, in the process of flowing the liquid into the joint or the cavity through the first opening, it is difficult to pass through the annular region of the annular plane, and sealing between the flow cell body and the joint can be achieved. In addition, because the annular plane outside still is provided with the tread, connect in the tread, can further play sealed effect, improve the sealing performance of joint and flow cell body junction. The flow cell provided by the technical scheme adopts the mode that the joint is in surface contact with the flow cell body to realize sealing, has a simple structure, can realize sealing after the joint is connected with the flow cell body, and is simple to operate.

With reference to the first aspect, in some embodiments, the flow cell body is provided with a countersink, a bottom surface of the countersink is an annular plane, and a side wall of the countersink is a thread surface; the connector comprises a first section, a second section and a third section which are sequentially arranged in the length direction, and the end face of the first section is abutted against the annular plane; the second section has external threads to connect the second section to the threaded surface; the third section is used for connecting the pipelines.

In the technical scheme, the counter sink is arranged on the flow cell body, and threads are arranged on the side wall of the counter sink to realize connection between the flow cell body and the connector.

With reference to the first aspect, in some embodiments, the third section is connected with a pipe, the pipe is a hose, the third section is further provided with external threads, the pipe is sleeved outside the third section, the third section is further connected with a nut, and in a radial direction of the third section, the pipe is located between the nut and the third section.

By arranging the nut on the outside of the third section and in the radial direction of the third section the pipe is located between the nut and the third section, i.e. the nut compresses the pipe on the outside of the third section of the joint, it is possible to avoid that the pipe falls off the joint.

With reference to the first aspect, in some embodiments, the flow cell body is provided with a boss, a top surface of the boss is an annular plane, and an outer side surface of the boss is a threaded surface;

the joint is provided with a countersunk hole, the inner side surface of the countersunk hole is provided with internal threads matched with the boss, and the bottom surface of the countersunk hole is abutted to the top surface of the boss.

In the technical scheme, the flow cell body is provided with the boss, the connector is provided with the counter bore, and the connector is connected with the flow cell body in a mode that the counter bore is sleeved on the boss.

With reference to the first aspect, in some embodiments, the number of the first openings is two, the two first openings are oppositely disposed in the flow cell body, and one joint is connected to each of the two first openings.

In the above technical solution, the two first openings are respectively used for allowing the liquid to flow into and flow out of the cavity.

With reference to the first aspect, in some embodiments, the mounting opening is disposed between two first openings.

In the above technical scheme, through setting up the mounting port between two first openings, can make detection device carry out more accurate measurement to the liquid in the cavity.

In combination with the first aspect, in some embodiments, the flow cell body includes a flow cell base and a flange, the flange sets up the installing port, the flow cell base is provided with the second opening, the installing port, the second opening and the cavity communicate in proper order, detection device installs in the installing port, the flange closes the second opening, and the detection end of detection device is located the cavity inside after passing through the second opening.

The flow cell body comprises a flow cell base and a flange plate which are connected with each other, so that the processing difficulty of the flow cell body can be reduced.

With reference to the first aspect, in some embodiments, the flow cell base and the connector are PTFE structural members.

The PTFE material can be used for acidic and alkaline solutions, so that the flow cell provided by the technical scheme can be used for more scenes.

With reference to the first aspect, in some embodiments, the flange has a first surface facing the flow cell base, the flow cell base has a second surface facing the flange, the first surface being provided with a first annular protrusion, the second surface being provided with a second annular protrusion;

the second opening is positioned at the inner side of the first annular bulge and the inner side of the second annular bulge, the contact area of the first annular bulge and the second surface is in a closed annular shape, and the contact area of the second annular bulge and the first surface is in a closed annular shape.

In the technical scheme, the flange plate and the flow cell base are sealed through the first annular bulge and the second annular bulge, so that the solution in the cavity can be prevented from leaking through the second opening.

In a second aspect, an embodiment of the present utility model provides a liquid delivery line, including a liquid storage tank, where the liquid storage tank is connected to the flow cell provided in the first aspect through a pipe, and a detection device is installed at an installation port of the flow cell, so as to detect liquid delivered from the liquid storage tank.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a flow cell provided by an embodiment of the present utility model after a detection device is installed;

FIG. 2 is a cross-sectional view of a flow cell according to an embodiment of the present utility model in use;

FIG. 3 is a schematic structural diagram of a flow cell base according to an embodiment of the present utility model;

FIG. 4 is a second schematic structural diagram of a flow cell base according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a flange according to an embodiment of the present utility model.

Icon: 100-a flow cell body; 110-a cavity; 120-linker; 130-a flow cell base; 131-a first opening; 132-countersink; 1321-annular plane; 1322-thread faces; 133-groove; 134-a second opening; 135-a first annular protrusion; 136-boss; 140-flange plates; 141-a mounting port; 142-a second annular protrusion; 150-piping; 200-detection device.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the product of the application, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The inventor of the present utility model has found that when using the existing flow cell, the existing flow cell is troublesome in the process of assembling the flow cell due to the adoption of the sealing ring; in addition, as the sealing ring is mostly made of rubber materials, the sealing ring can be corroded by the solution in the using process of the flow cell.

Based on this, the inventor of the present utility model provides a flow cell, by abutting the end surface of the connector 120 against the surface of the flow cell body 100, so as to avoid leakage at the connection position between the connector 120 and the flow cell, and further, a threaded surface 1322 is further provided on the outer side of the contact surface, and the connector 120 is connected with the flow cell body 100 through the threaded surface 1322, so as to further improve the sealing performance at the connection position of the connector 120.

In one embodiment, as shown in fig. 1 to 3, the flow cell provided by the present utility model includes a flow cell body 100, and a cavity 110 is disposed in the flow cell body 100. The flow cell body 100 is further provided with a first opening 131 and a mounting port 141, both of which are in communication with the cavity 110. Liquid enters or exits the cavity 110 through the first opening 131; the mounting port 141 is used for mounting the detection device 200, and since the mounting port 141 is also in communication with the chamber 110, after the detection device 200 is mounted on the mounting port 141, the detection end of the detection device 200 can enter the chamber 110 to detect the solution in the chamber 110. The flow cell body 100 is connected with a joint 120 at the position of the first opening 131, the joint 120 being used for connecting the pipe 150, so that the liquid in the pipe 150 can flow into the cavity 110 of the flow cell body 100 through the joint 120 and the first opening 131 in sequence, or so that the liquid in the pipe 150 can flow into the pipe 150 through the first opening 131 and the joint 120 in sequence. It should be understood by those skilled in the art that the connector 120 should have a through hole, and the through hole interfaces with the first opening 131 to enable liquid to flow back and forth between the cavity 110 and the connector 120.

In some embodiments, the interface of flow cell body 100 with connector 120 includes a threaded surface 1322 and an annular planar surface 1321. The first opening 131 is disposed on the annular plane 1321, that is, the first opening 131 makes the surface of the flow cell have an annular plane, and the inner edge of the annular plane 1321 is the edge of the first opening 131. The threaded surface 1322 of the flow cell body 100 is configured to be coupled to the adaptor 120. The joint 120 is abutted against the annular plane 1321, and a region of the annular plane 1321 abutted against the joint 120 is a closed annular region, that is, after the joint 120 is abutted against the annular plane 1321, a space between the inside and the outside of the annular region is isolated from each other, and liquid cannot flow from the inside to the outside of the annular region.

In this embodiment, the first opening 131 is located inside the annular region, so that in the process of flowing between the connector 120 and the cavity 110 through the first opening 131, the liquid is limited to flow inside the annular region, and leakage at the connection position of the connector 120 and the flow cell body 100 is avoided. It should be noted that, the first opening 131 is located inside the annular region and is not the edge of the annular region, that is, the edge of the first opening 131, and a certain distance may exist between the first opening 131 and the annular region in the radial direction.

Further, the screw surface 1322 is located outside the annular plane 1321 to further improve the sealing property, and if a small amount of liquid leaks at the annular region, it is difficult for the leaked liquid to leak further from the screw surface 1322 where the flow cell body 100 and the joint 120 are mated. Further, the threaded surface 1322 is connected to an outer edge of the annular planar surface 1321; the connection may be made directly between the threaded surface 1322 and the outer edge of the annular flat 1321, or indirectly between the threaded surface 1322 and the annular flat 1321 via other connection surfaces.

In some embodiments, the fitting 120 has external threads. As shown in fig. 3, a counter bore 132 is provided in the flow cell body 100, and the adaptor 120 is screwed into the counter bore 132. In this embodiment, the first opening 131 is disposed on the bottom plane of the counterbore 132, such that the bottom of the counterbore 132 is an annular plane 1321, preferably the first opening 131 is centered on the bottom plane of the counterbore 132. The sidewall of the countersunk hole 132 is provided with an internal thread matching with the external thread of the connector 120, i.e. the sidewall of the countersunk hole 132 is a thread surface 1322, so as to realize the threaded connection of the connector 120 and the flow cell body 100. After the nipple 120 is screwed into the counterbore 132, the end face of the nipple 120 abuts against an annular region in the annular flat surface 1321 surrounding the first opening 131. In the present utility model, the abutment of the end surface of the joint 120 with the annular plane 1321 means: the contact of the fitting 120 with the annular flat 1321; the annular region in which the end face of the joint 120 abuts on the annular plane 1321 in the present utility model means: the annular region in annular plane 1321 fully engages the end face of fitting 120 to isolate the inside from the outside of the annular region, preventing liquid located inside the annular region from flowing outside the annular region.

In the above embodiment, the joint 120 includes the first, second, and third sections that are sequentially provided in the longitudinal direction. The end surface of the first section is also planar and annular for abutment with the annular planar surface 1321 in the flow cell base 130. The second section has external threads for threaded connection with the sidewall of counterbore 132. The third section is for connection to the pipe 150.

In other embodiments of the present utility model, as shown in fig. 4, the joint 120 may be provided with an internal thread, and the joint 120 may be connected to the flow cell body 100 by an external thread provided in the flow cell body 100. Specifically, the flow cell body 100 may be provided with the boss 136, the top surface of the boss 136 is an annular plane 1321, the first opening 131 is disposed on the top surface of the boss 136, and the edge of the first opening 131 is the inner edge of the annular plane 1321. The joint 120 is provided with a countersunk hole, the bottom surface of the countersunk hole is abutted with the top surface of the boss 136, and the side wall of the countersunk hole is provided with internal threads for being matched with external threads on the outer side of the boss 136. In such an embodiment, the fitting 120 may also have a third section for connection with the pipe 150.

The fittings 120 in the above embodiments each have a third section for connection to the conduit 150. A specific connection may be a third section of the fitting 120 threadably connected to the conduit 150; it is also possible to directly fit the tube 150 over the third section of the fitting 120 by using a hose as the tube 150.

In the above embodiment, in the case of using a hose as the pipe 150, an external thread may be provided at the third section of the joint 120 and a nut for locking the pipe 150 to the joint 120 may be attached. The specific implementation method comprises the following steps: when the pipe 150 is installed, the pipe 150 is first sleeved outside the third section, and then the third section is connected with the nut to lock the pipe 150 at the third section of the joint 120, that is, after the nut is connected, the pipe 150 is located between the nut and the third section of the joint 120 in the radial direction of the joint 120.

In the present utility model, the number of the first openings 131 is not particularly limited as long as it is capable of allowing the liquid to enter and exit the cavity 110 through the first openings 131, the number of the first openings 131 is at least one, the liquid is detected by the detecting device 200 after entering the cavity 110 through the first openings 131, and then the liquid exits the cavity 110 through the first openings 131. In some embodiments, the number of first openings 131 is two, and accordingly, one connector 120 is connected to each of the two first openings 131. The two first openings 131 may be disposed opposite to the flow cell body 100, or may be disposed in other positions on the flow cell body 100, and in the case where the number of the first openings 131 is two, one of the first openings 131 may be used for flowing the liquid into the cavity 110, and the other first opening 131 may be used for flowing the liquid out of the cavity 110. Preferably, the mounting port 141 is disposed between the two first openings 131.

In some embodiments of the present utility model, the flow cell body 100 includes a flow cell base 130 and a flange 140, and the flange 140 is coupled to the flow cell base 130 by bolts. The flow cell base 130 is provided with a groove 133, the opening of the groove 133 is a second opening 134, and after the flange 140 covers the second opening 134, the groove 133 in the flow cell base 130 becomes a part of the cavity 110 in the flow cell base 130. Because the cavity 110 is provided in the flow cell body 100, if the flow cell body 100 is a whole structure, it is difficult to manufacture the flow cell body, and the processing difficulty and cost of the flow cell body 100 can be reduced by adopting the manner of assembling the flow cell base 130 and the flange 140 into the flow cell body 100.

In some embodiments of the present utility model, as shown in fig. 3 and 5, the first opening 131 is disposed on the flow cell base 130, and the mounting opening 141 is disposed on the flange 140. In other embodiments of the present utility model, the first opening 131 may also be disposed on the flange 140. Further, the mounting port 141 can communicate with the cavity 110 through the second opening 134, so that the detection end of the detection device 200 can enter the cavity 110 to detect the liquid after the detection device 200 is mounted on the mounting port 141. That is, it can be understood that the mounting port 141 and the second opening 134 are sequentially communicated with the chamber 110.

Since the flow cell body 100 is assembled by the flow cell base 130 and the flange 140, the flange 140 needs to cover the second opening 134 to obtain the cavity 110 in the flow cell body 100, and the junction between the flange 140 and the flow cell base 130 needs to be sealed to avoid liquid leakage in the cavity 110. In some embodiments, sealing may be achieved by providing a sealing ring between the flow cell body 100 and the flange 140.

In a preferred embodiment of the present utility model, the junction between the flange 140 and the flow cell base 130 is sealed by a sealing means other than a sealing ring, so that the flange 140 and the flow cell base 130 are assembled into the flow cell body 100. In some embodiments, as shown in fig. 2, 3 and 5, the flange 140 has a first surface facing the flow cell base 130, the first surface being planar; the flow cell base 130 has a second surface facing the flange 140, which is also planar. The first surface is provided with a closed first annular protrusion 135, the second surface is provided with a closed second annular protrusion 142, the protrusion height of the first annular protrusion 135 is consistent with the protrusion height of the second annular protrusion 142, the inner diameter of the first annular protrusion 135 is larger than the outer diameter of the second annular protrusion 142, or the outer diameter of the first annular protrusion 135 is smaller than the inner diameter of the second annular protrusion 142, so that interference between the first annular protrusion 135 and the second annular protrusion 142 does not occur when the flange plate 140 is connected with the flow cell base 130. After the flange plate 140 is connected with the flow cell base 130, the annular surface of the first annular protrusion 135 is abutted against the second surface, and the contact surface is a closed annular area, so that liquid can be prevented from leaking from the inner side of the first annular protrusion 135 to the outer side of the first annular protrusion 135; the annular surface of the second annular protrusion 142 abuts against the first surface, and the contact surface is a closed annular area, so that leakage of the liquid from the inner side of the second annular protrusion 142 to the outer side of the second annular protrusion 142 can be avoided.

In the embodiment of the present utility model, the first annular protrusion 135 may be provided only on the first surface, or the second annular protrusion 142 may be provided only on the second surface.

In the embodiment of the present utility model in which the mounting opening 141 is provided in the flange 140, the mounting opening 141 should be located inside the second opening 134 after the flange 140 is connected to the flow cell base 130, so that the detection end of the detection device 200 can enter the cavity 110 of the flow cell body 100 through the second opening 134 after passing through the mounting opening 141.

Preferably, the mounting port 141 is disposed concentric with the first annular projection 135 and the second opening 134 is disposed concentric with the second annular projection 142; when installed, the mounting port 141 is mounted concentric with the second opening 134. Specifically, the flange plate 140 is connected with the flow cell base 130 through a plurality of bolts, bolt through holes are formed in the flange plate 140, and threaded holes for being matched with the bolts are formed in the flow cell base 130. The bolt through holes are arranged along the circumference concentric with the mounting opening 141, and the threaded holes for connecting bolts on the flow cell base 130 are arranged along the circumference concentric with the second opening 134, so that the concentric mounting of the mounting opening 141 and the second opening 134 can be realized.

Further, in order to enable the flow cell provided by the present utility model to be applied to both acidic liquid and alkaline liquid, in some embodiments, the flow cell body 100 may be a PTEF structural member, specifically, the flow cell base 130 is a PTEF structural member, and correspondingly, the flange 140 may also be a PTEF structural member.

The type of the detection device 200 that can be used in the flow cell provided by the present utility model is not limited, and in alternative embodiments, the detection device 200 may be a concentration meter.

On the basis of the above, the inventor of the present utility model also provides a liquid feeding pipeline, which comprises a liquid storage tank (not shown in the figure), wherein the liquid storage tank is connected with the flow cell provided by any one of the above embodiments through a pipeline 150, a detection device 200 is installed at an installation port 141 of the flow cell, and a detection end of the detection device 200 for detection is located in the cavity 110. The liquid in the liquid storage tank enters the cavity 110 in the flow cell after passing through the pipeline 150, and is detected by the detection end of the detection device 200.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The flow cell is characterized by comprising a flow cell body and a joint for connecting a pipeline;

the flow cell body is internally provided with a cavity, the flow cell body is provided with a first opening communicated with the cavity and a mounting opening, the mounting opening is used for mounting a detection device,

the flow cell body is connected with the joint so that fluid in the pipeline can flow into or out of the cavity; the contact surface of the flow cell body and the joint comprises a thread surface and an annular plane; the threaded surface is located on the outer side of the annular plane, the joint is connected to the threaded surface, the joint is abutted to an annular area which is sealed in the annular plane, and the first opening is located on the inner side of the annular area.

2. The flow cell according to claim 1, wherein the flow cell body is provided with a counter bore, the bottom surface of the counter bore is the annular plane, and the side wall of the counter bore is the threaded surface;

the connector comprises a first section, a second section and a third section which are sequentially arranged in the length direction, and the end face of the first section is abutted against the annular plane;

the second section having external threads to connect the second section to the threaded surface; the third section is used for connecting the pipeline.

3. The flow cell according to claim 2, wherein the third section is connected with the pipe, the pipe is a hose, the third section is further provided with an external thread, the pipe is sleeved outside the third section, the third section is further connected with a nut, and the pipe is located between the nut and the third section in a radial direction of the third section.

4. The flow cell according to claim 1, wherein the flow cell body is provided with a boss, the top surface of the boss is the annular plane, and the outer side surface is the threaded surface;

the connector is provided with a countersunk hole, the inner side surface of the countersunk hole is provided with internal threads matched with the boss, and the bottom surface of the countersunk hole is abutted to the top surface of the boss.

5. The flow cell according to claim 1, wherein the number of the first openings is two, the two first openings are oppositely arranged on the flow cell body, and one joint is connected to each of the two first openings.

6. The flow cell of claim 5, wherein the mounting port is disposed between two of the first openings.

7. The flow cell according to any one of claims 1-6, wherein the flow cell body comprises a flow cell base and a flange plate, the flange plate is provided with the mounting opening, the flow cell base is provided with a second opening, the mounting opening, the second opening and the cavity are sequentially communicated, the detection device is mounted on the mounting opening, the flange plate covers the second opening, and the detection end of the detection device is located inside the cavity after passing through the second opening.

8. The flow cell of claim 7, wherein the flow cell base and the junction are PTFE structural members.

9. The flow cell of claim 7, wherein the flange has a first surface facing the flow cell base, the flow cell base has a second surface facing the flange, the first surface being provided with a first annular protrusion, the second surface being provided with a second annular protrusion;

the second opening is positioned on the inner side of the first annular bulge and the inner side of the second annular bulge, the contact area of the first annular bulge and the second surface is in a closed annular shape, and the contact area of the second annular bulge and the first surface is in a closed annular shape.

10. A liquid delivery pipeline, characterized by comprising a liquid storage tank, wherein the liquid storage tank is connected with the flow cell according to any one of claims 1-9 through a pipeline, and a detection device is arranged at an installation port of the flow cell so as to detect liquid delivered from the liquid storage tank.