CN218818779U - a variable diameter tube - Google Patents

Abstract

The utility model discloses a variable diameter pipe, which comprises: a first pipe body; a second pipe body, the first pipe body penetrates into the second pipe body and communicates with the second pipe body; wherein, the The end of the first pipe body is sleeved with a sealing member, and the outer surface of the sealing member abuts against the inner surface of the through hole of the second pipe body, and the inner surface of the through hole of the sealing member abuts against the inner surface of the second pipe body. the outer surface of the first pipe body, so that the first pipe body is sealed with the second pipe body. The reducing pipe of this technical solution is provided with a sealing member at the end of the first pipe body, and the first pipe body penetrates into the second pipe body, so that the outer surface of the sealing member abuts against the inner surface of the through hole of the second pipe body , and the inner surface of the through hole of the sealing member abuts against the outer surface of the first pipe body, thereby reducing the gap between the first pipe body and the second pipe body, and the first pipe body and the second pipe body have higher sealing performance .

Description

a variable diameter tube

technical field

The utility model relates to the technical field of infusion tubes, in particular to a variable-diameter tube.

Background technique

With the rapid development of research in food, medicine, environmental protection, petrochemical and other fields, the detection role of liquid chromatography is becoming more and more prominent. In order to realize the convenience of pipeline connection in liquid chromatography, the instrument connection pipeline is more and more developed in the direction of being easy to bend and connect. Common liquid chromatography infusion tube materials are divided into two categories, one is metal materials (such as: stainless steel, titanium alloy, etc.), and the other is polymer materials (such as: PTFE, PEEK). With the characteristics of ultra-high pressure resistance, it has become an extremely important component in the field of pipes.

Chinese patent CN113374950A discloses a high-pressure liquid chromatography joint and a fluid connection system to achieve zero dead volume. The connection system includes a liquid-phase two-way joint with ports at both ends, and internal threads on the inner wall of the ports. , the internal thread and the external thread are matched and connected, the inner side of the port is provided with a variable diameter port, the cross section of the variable diameter port is a trapezoidal structure, the inner side of the variable diameter port is provided with a channel port, the channel The mouth connects the two variable diameter ports; the assembly nut, the external thread of the assembly nut is screwed with the internal thread thread; the hoop, the extension of the hoop extends into the inside of the passage port, and the assembly nut The crushing end surface and the compression end surface of the hoop compress the PEEK tube, the PEEK tube is embedded into the hoop, the load-bearing end of the PEEK tube extends into the inside of the channel opening, and the end faces of the two load-bearing ends butt against each other to form a face seal structure.

The load-bearing end of the PEEK tube involved in the above-mentioned patent extends into the interior of the channel opening, and the end faces of the two load-bearing ends abut to form a surface-sealed structure. However, this type of sealing structure has extremely strict requirements on the flatness of the end surface, and a slight external force acts on the pipe body, and a gap is easily generated between the end surfaces of the pipe body, thereby affecting the sealing effect.

In addition, Chinese patent CN202080057487.0 discloses a fitting for a fluid coupling in a chromatographic system, including a compression screw including an axial hole, a threaded portion and a driving end; a tube assembly, the tube The assembly includes a tube sleeve and an inner tube disposed through the tube sleeve, the tube sleeve and the inner tube each extending to an end face of the tube assembly, the tube sleeve including an outer surface; a sealing body, the The sealing body extends between a first end face and a second end face, the first end face adjoining the end face of the tube assembly, the sealing body including an outer surface; and a collar secured to the said outer surface of said tube sleeve and said outer surface of said seal body; and fluidly coupling said fitting to a liquid chromatograph by manually tightening said compression screw without tightening tools Receiver accessories for the system.

Similarly, the pipe assembly and the sealing body involved in the above-mentioned patents form a face-seal structure through the abutment of the end faces of the pipe body, and when there is a gap between the abutment faces, it is easy to cause fluid leakage.

To sum up, the existing infusion tubes used for liquid chromatography mainly squeeze the reducing tube so that the end face of the reducing tube abuts against the end face of another tube body, thereby achieving the effect of sealing. This type of sealing structure has extremely strict requirements on the flatness of the end surface, and a slight external force acts on the pipe body, and a gap is easily generated between the end surfaces of the pipe body, resulting in liquid leakage. Therefore, the existing liquid chromatography reducing tube has the problems of unstable sealing effect and poor sealing performance.

Utility model content

The purpose of the utility model is to propose a variable diameter tube, aiming at solving the technical problem of poor sealing performance of the existing variable diameter tube.

In order to achieve the above object, the utility model proposes a reducing pipe, comprising:

first body;

The second pipe body, the first pipe body penetrates into the second pipe body and communicates with the second pipe body; wherein, the end of the first pipe body is sleeved with a sealing member, and through the sealing The outer surface of the member abuts against the inner surface of the through hole of the second pipe body, and the inner surface of the through hole of the sealing member abuts against the outer surface of the first pipe body, so that the first pipe body Sealed with the second tube body.

As a further improvement of the utility model: one end of the sealing member has a cone structure, the end of the through hole of the second pipe body is provided with a first connection groove, and one end of the sealing member is connected to the first Groove connection.

As a further improvement of the utility model: the first connecting groove is in an inverted cone structure.

As a further improvement of the present utility model: the outer surface of the sealing member is provided with external threads, the inner surface of the through hole of the second pipe body is provided with internal threads, and the first sealing member and the second pipe body are detachable connect.

As a further improvement of the present utility model: the sealing member includes a blade ring and a connecting screw, and both the blade ring and the connecting screw are sleeved on the surface of the first pipe body.

As a further improvement of the present utility model: the blade ring has a pyramid structure, one end of the blade ring is connected to the first connecting groove, and the other end of the blade ring is connected to the connecting screw.

As a further improvement of the utility model: one end of the blade ring has a pyramid structure, and the other end of the blade ring has a flat head structure.

As a further improvement of the utility model: the outer surface of the connecting screw is provided with external threads, and the connecting screw is detachably connected to the second pipe body.

As a further improvement of the utility model: the blade ring is made of stainless steel.

As a further improvement of the present utility model: the sealing member includes a blade ring and a connecting screw. It is connected with the first connection groove, and the other end of the edge ring is connected with the second connection groove.

As a further improvement of the utility model: the second connection groove is in an inverted cone structure.

As a further improvement of the present utility model: the first pipe body includes a thin tube and a sleeve, and the thin tube penetrates into the sleeve and is welded and fixed with the sleeve.

As a further improvement of the utility model: the inside of one end of the sleeve is provided with a chamfer.

As a further improvement of the utility model: the thin tube is made of metal.

As a further improvement of the present utility model: both ends of the first pipe body are provided with sealing members.

Compared with the prior art, the utility model has the following beneficial effects:

In the variable diameter pipe of the technical solution, a sealing member is provided at the end of the first pipe body, and the first pipe body penetrates into the second pipe body, so that the outer surface of the sealing member abuts against the inner surface of the through hole of the second pipe body , and the inner surface of the through hole of the sealing member abuts against the outer surface of the first pipe body, thereby reducing the gap between the first pipe body and the second pipe body, and the first pipe body and the second pipe body have higher sealing performance .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative work.

Fig. 1 is the schematic structural view of the first embodiment of the pipe body of the present application;

Fig. 2 is the connection sectional view of Embodiment 1 of the reducing pipe of the present application;

Fig. 3 is the connection sectional view of embodiment two of the reducing pipe of the present application;

Fig. 4 is a connection sectional view of Embodiment 3 of the reducing pipe of the present application.

Explanation of reference numbers:

label name label name 1 Blade ring 2 connecting screw 3 casing 4 Thin tube 5 first body 6 second body 9 sealing member 10 Chamfer 11 first connection slot 12 Second connection slot

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present utility model, the directional indication is only used to explain the relationship between the components in a certain posture. If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, if "and/or" or "and/or" appears throughout the text, its meaning includes three parallel plans, taking "A and/or B" as an example, including plan A, or plan B, or A and B is a solution that is satisfied at the same time. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

The one-piece reducing tube in the market is mainly used in high-end imported liquid chromatography instruments. Its form is also designed according to different manufacturers, but most of these products use a small piece of PEEK embedded in one end of the variable diameter, and then The narrow tube is embedded in the PEEK segment by extrusion and other processes to realize the function of changing diameter. This type of product achieves the sealing function mainly by extruding the variable-diameter pipeline, which drives the extrusion of the PEEK section, so that the PEEK end surface and the other contact surface are extruded and deformed to achieve the effect of PEEK end-to-end sealing. Because this type of sealing structure has extremely strict requirements on the flatness of the end surface, and the pipe body is slightly externally forced, a gap is easily generated between the end surfaces of the pipe body, resulting in liquid leakage. Therefore, the existing liquid chromatography reducing tube has the problems of unstable sealing effect and poor sealing performance.

The purpose of the utility model is to propose a variable diameter tube, aiming at solving the technical problem of poor sealing performance of the existing variable diameter tube.

Embodiment one

Please refer to Fig. 1-Fig. 2, the reducer of the present embodiment comprises:

the first pipe body 5;

The second pipe body 6, the first pipe body 5 penetrates into the second pipe body 6 and communicates with the second pipe body 6; wherein,

The end of the first pipe body 5 is sleeved with a sealing member 9, through which the outer surface of the sealing member 9 abuts against the inner surface of the through hole of the second pipe body 6, and through the through hole of the sealing member 9 The inner surface of the hole abuts against the outer surface of the first tube body 5 to seal the first tube body 5 and the second tube body 6 .

Specifically, the variable diameter tube of this embodiment is used for high performance liquid chromatography. The first pipe body 5, the second pipe body 6, and the sealing member 9 of this embodiment are all tubular structures with through holes inside. The sealing member 9 is integrally arranged, and the sealing member 9 is sleeved on the first pipe body 5, and enters the through hole of the second pipe body 6 by squeezing the sealing member 9, so that the sealing member 9 closely fits the second pipe body 6 through holes, and due to the extrusion deformation of the sealing member 9, the sealing member 9 tightly embraces the outer surface of the first pipe body 5, thereby reducing the gap between the first pipe body 5 and the second pipe body 6, so as to achieve sealing, and because Through the way of squeezing and abutting, it is not easy to loosen under the action of external force, and the sealing stability is higher.

The reducing pipe of this embodiment is provided with a sealing member at the end of the first pipe body, through which the first pipe body penetrates into the second pipe body, so that the outer surface of the sealing member abuts against the inner surface of the through hole of the second pipe body , and the inner surface of the through hole of the sealing member abuts against the outer surface of the first pipe body, thereby reducing the gap between the first pipe body and the second pipe body, and the first pipe body and the second pipe body have higher sealing performance .

More specifically, please refer to FIG. 1, the first tube body 5 includes a thin tube 4 and a sleeve 3, both of which are made of metal, and one end of the sleeve 3 is provided with a chamfer 10 inside, and the thin tube 4 It penetrates into the sleeve 3 and is welded and fixed with the sleeve 3 . When the thin tube 4 and the sleeve 3 are welded, the welding end of the sleeve 3 and the thin tube 4 is cut with a special pipe cutter, and then polished with a special pipe grinder, and then the pipeline at this time is through-holed. , to make an integral first tube body 5 . Since the inner side of one end of the casing is provided with a chamfer 10, it can meet the sealing requirements of the solder at the chamfer in the welding process and the connection of the casing 3 and the thin tube 4, and the welding place is easy to bend during use. With such a welding design, the structure of the first tube body 5 can avoid that when the blade ring 1 is used for sealing, the sleeve 3 is squeezed due to the blade ring embracing the sleeve 3, causing displacement between the sleeve 3 and the thin tube 4, or lead to cracks in the solder.

More specifically, please refer to FIG. 2 , one end of the sealing member 9 has a conical structure, and the end of the through hole of the second pipe body 6 is provided with a first connecting groove 11 , and the first connecting groove 11 has a shape of Inverted cone structure. The outer surface of the sealing member 9 is provided with external threads, the inner surface of the through hole of the second pipe body 6 is provided with internal threads, and the second sealing member 9 is detachably connected to the second pipe body 6 . In such a setting, the sealing member 9 is moved toward the inside of the second pipe body 6 by hand-tightening the sealing member 9, and the end of the sealing member 9 and the first connecting groove 11 can be closely fitted, and the sealing member 9 and the second pipe body 6 There are fewer gaps and higher sealing performance.

In addition, both ends of the first pipe body 5 in this embodiment can be provided with sealing members 9 , and both ends of the first pipe body 5 can be connected to the second pipe body 6 through the sealing members 9 .

When assembling the reducing pipe of this embodiment, put a sealing member 9 on one end of the first pipe body 5, screw the sealing member 9 into the second pipe body 6 through threads, and then use a tool wrench to gradually tighten the sealing member 9, The tapered surface at one end of the sealing member 9 is closely combined with the inner surface of the through hole of the second pipe body 6; Restricted by the connection groove 11, the sealing member 9 is pressed forward and inwardly, at this time, the sleeve 3 of the first pipe body 5 is tightly held by the sealing member 9 under force, and the special structure of the sleeve 3 and the thin tube 4 The welding process is used to connect so that there is no gap between the two. Therefore, since the sealing member 9 tightly hugs the first tube body 5, and the thin tube 4 in the first tube body 5 is connected with the special-structure sleeve 3 by welding, thereby completely forming a sealing system. In addition, the other end of the first pipe body 5 can also be equipped with the same sealing member 9 , and its installation position is distributed in a mirror image with the other end of the first pipe body 5 .

Embodiment two

Please refer to FIG. 3, the difference between this embodiment and the first embodiment is that the sealing member 9 includes a blade ring 1 and a connecting screw 2, and the blade ring 1 and the connecting screw 2 are both sleeved on the first pipe body. 5 surfaces. The blade ring 1 is made of stainless steel, the blade ring 1 has a pyramid structure, one end of the blade ring 1 is connected to the first connection groove 11, and the other end of the blade ring 1 is connected to the connecting screw 2 connect.

More specifically, one end of the blade ring 1 has a pyramid structure, and the other end of the blade ring 1 has a flat head structure. The end of the connecting screw 2 close to the blade ring 1 also has a flat head structure, the outer surface of the connecting screw 2 is provided with external threads, and the connecting screw 2 is detachably connected to the second pipe body 6 . In such a setting, by hand-tightening the connecting screw 2, the connecting screw abuts against the blade ring 1, so when the connecting screw 2 is screwed into the second tube body 6, the connecting screw 2 passes through one end of the blade ring 1, so that the blade ring The other end of 1 closely fits the first connecting groove of the second pipe body 6 .

Embodiment Three

Please refer to Fig. 4, the difference between this embodiment and the second embodiment is that the two ends of the blade ring 1 have a pyramidal structure, and one end of the connecting screw 2 is provided with a second connecting groove 12, and the second connecting The groove is in an inverted cone structure, one end of the blade ring 1 is connected to the first connection groove 11 , and the other end of the blade ring 1 is connected to the second connection groove 12 .

When assembling the variable diameter tube of this embodiment, the connecting screw 2 and the blade ring 1 are sequentially put on one end of the first tube body 5, and the sealing member 9 is screwed into the second tube body 6 through threads, and then the sealing member 9 is screwed into the second tube body 6 with a tool wrench. The member 9 is gradually tightened, so that the tapered surface at one end of the sealing member 9 is closely combined with the inner surface of the through hole of the second pipe body 6; at the same time, when one end of the sealing member 9 is pressed inward, the Restricted by the first connecting groove 11 in the body 6, the sealing member 9 is pressed forward and inwardly, at this time, the sleeve 3 of the first pipe body 5 is held tightly by the sealing member 9 under force, and the sleeve of special structure 3 and the thin tube 4 are connected by a welding process, so that there is no gap between the two. Therefore, since the sealing member 9 tightly hugs the first tube body 5, and the thin tube 4 in the first tube body 5 is connected with the special-structure sleeve 3 by welding, thereby completely forming a sealing system. In addition, the other end of the first pipe body 5 can also be equipped with the same sealing member 9 , and its installation position is distributed in a mirror image with the other end of the first pipe body 5 .

To sum up, after the user tightens the connecting screw 3, the blade ring 1 is tightly combined with the integrated first tube body 5, and the sleeve tube 3 and the thin tube 4 are tightly combined by welding, which can realize high-pressure sealing of the whole pipeline; in addition , the front end of the first tube body 5 is tapered and chamfered, which can strengthen the firmness of the welding, and can also prevent the cracking of the solder in the gap between the two tubes caused by the sleeve 4 due to the blade ring 1 being too tightly embraced by the sleeve 4. There is a risk of liquid leakage due to misalignment of the sleeve welded pipeline due to extrusion. The structure of the variable-diameter tube can be made into an integrated first tube body 5 with different lengths and different inner diameters as required, so as to replace the role of the inlet variable-diameter tube in high performance liquid chromatography. In addition, the installation of the reducing pipe does not require special tools or special accessories, and the connection can be realized by twisting the sealing member by hand, which is more convenient for operators to install on site.

The above is only an optional embodiment of the utility model, and therefore does not limit the patent scope of the utility model. Under the utility model concept of the utility model, the equivalent structural transformation made by using the specification of the utility model and the contents of the accompanying drawings , or directly/indirectly used in other relevant technical fields are all included in the patent protection scope of the present utility model.

Claims (9)

1. A reducing pipe, characterized in that, comprising: first body; The second pipe body, the first pipe body penetrates into the second pipe body and communicates with the second pipe body; wherein, the end of the first pipe body is sleeved with a sealing member, and through the sealing The outer surface of the member abuts against the inner surface of the through hole of the second pipe body, and the inner surface of the through hole of the sealing member abuts against the outer surface of the first pipe body, so that the first pipe body Sealed with the second tube body. 2. The reducing pipe according to claim 1, characterized in that, one end of the sealing member has a conical structure, the end of the through hole of the second pipe body is provided with a first connecting groove, and the sealing member One end of the component is connected to the first connection groove. 3. The reducing pipe according to claim 2, characterized in that, the outer surface of the sealing member is provided with external threads, the inner surface of the through hole of the second pipe body is provided with internal threads, and the sealing member and The second pipe body is detachably connected. 4 . The reducing pipe according to claim 2 , wherein the sealing member comprises a blade ring and a connecting screw, and the blade ring and the connecting screw are both sleeved on the surface of the first pipe body. 5. The reducing pipe according to claim 4, wherein the blade ring is in a pyramidal structure, one end of the blade ring is connected to the first connecting groove, and the other end of the blade ring is connected to the first connecting groove. The connection screw connection described above. 6 . The reducing tube according to claim 1 , wherein the first tube body includes a thin tube and a sleeve, and the thin tube penetrates into the sleeve and is welded and fixed with the sleeve. 7 . 7 . The reducing pipe according to claim 6 , wherein a chamfer is provided on the inner side of one end of the sleeve. 8 . 8. The reducing tube according to claim 6, wherein the thin tube is made of metal. 9. The reducing pipe according to claim 1, characterized in that, both ends of the first pipe body are provided with sealing members.

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