CN218818779U

CN218818779U - Reducing pipe

Info

Publication number: CN218818779U
Application number: CN202223120942.2U
Authority: CN
Inventors: 陈亮; 王丰琳; 夏日; 吕宪友; 毕英红; 唐涛; 李彤
Original assignee: Dalian Elite Analytical Instruments Co ltd
Current assignee: Dalian Elite Analytical Instruments Co ltd
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-04-07
Anticipated expiration: 2032-11-23

Abstract

The utility model discloses a reducing pipe, include: a first pipe body; the first pipe body penetrates into the second pipe body and is communicated with the second pipe body; the end part of the first pipe body is sleeved with a sealing component, the outer surface of the sealing component is abutted to the inner side face of the through hole of the second pipe body, and the inner side face of the through hole of the sealing component is abutted to the outer surface of the first pipe body, so that the first pipe body is sealed with the second pipe body. This technical scheme's reducing pipe sets up sealing member at the tip of first body, penetrates through first body in the second body, the through-hole medial surface that makes sealing member's surface butt second body to and the surface of the first body of medial surface butt of the through-hole that makes sealing member, thereby reduce the clearance between first body and the second body, first body is higher with second body leakproofness.

Description

Reducing pipe

Technical Field

The utility model relates to a transfer line technical field, concretely especially relate to reducing pipe.

Background

With the rapid development of research in the fields of food, medicine, environmental protection, petrochemical industry and the like, the liquid chromatography detection effect is more and more prominent. In order to realize convenience of pipeline connection in liquid chromatography, instrument connecting pipelines are increasingly developed towards the direction of easy bending and easy connection. Common liquid chromatography infusion tube materials are divided into two main types, one is a metal material (such as stainless steel, titanium alloy and the like), and the other is a polymer material (such as PTFE and PEEK), wherein the metal material infusion tube becomes an important component in the field of tube use due to the characteristic of ultrahigh pressure resistance.

Chinese patent CN113374950A discloses a high pressure resistant liquid chromatography joint and a fluid type connecting system for realizing zero dead volume, wherein the connecting system comprises a liquid phase two-way joint, two ends of the liquid phase two-way joint are respectively provided with a port, the inner wall of the port is provided with an internal thread, the internal thread is matched and connected with the external thread, the inner side of the port is provided with a reducing port, the section of the reducing port is of a trapezoidal structure, the inner side of the reducing port is provided with a channel port, and the two reducing ports are communicated through the channel port; the external thread of the assembling nut is screwed with the internal thread; the staple bolt, the extension section of staple bolt stretches into the inside to the entrance, assembly nut break the terminal surface with the terminal surface that compresses tightly of staple bolt compresses tightly the PEEK pipe, the PEEK pipe inlay establish extremely in the staple bolt, the end that bears of PEEK pipe stretches into the inside to the entrance, and two terminal surface looks butt that bear the end form a seal structure.

The bearing end of the PEEK pipe involved in the patent extends into the inside of the channel opening, and the end surfaces of the two bearing ends are abutted to form a surface sealing structure. However, the requirements of the sealing structure on the flatness of the end face are extremely strict, the pipe body has a slight external force effect, and a gap is easily generated between the end face and the end face of the pipe body, so that the sealing effect is influenced.

Furthermore, chinese patent CN202080057487.0 discloses a fitting for a fluid coupling in a chromatography system, comprising a compression screw comprising an axial bore, a threaded portion and a driving end; a tube assembly comprising 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 comprising an outer surface; a seal body extending between a first end face and a second end face, the first end face abutting the end face of the pipe assembly, the seal body including an outer surface; and a collar secured to the outer surface of the pipe sleeve and the outer surface of the seal body; and fluidly coupling the fitting to a receiver fitting of a liquid chromatography system by manually tightening the compression screw without a tightening tool.

Similarly, the pipe assembly and the seal body according to the above patent form a surface seal structure by the end surface of the pipe body coming into contact with the end surface, and if a gap is formed between the contact surfaces, fluid leakage is likely to occur.

In summary, the existing liquid transport tube for liquid chromatography mainly extrudes the reducer tube to make the end surface of the reducer tube abut against the end surface of another tube body, thereby achieving the sealing effect. The sealing structure has extremely strict requirements on the flatness of the end face, the pipe body has a slight external force effect, and a gap is easily generated between the end face and the end face of the pipe body, so that liquid leakage is caused. Therefore, the conventional liquid chromatography reducer has the problems of unstable sealing effect and poor sealing performance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a reducing pipe aims at solving the poor technical problem of sealing performance of current reducing pipe.

In order to achieve the above object, the utility model provides a reducing pipe, include:

a first pipe body;

the first pipe body penetrates into the second pipe body and is communicated with the second pipe body; the end part of the first pipe body is sleeved with a sealing component, the outer surface of the sealing component is abutted to the inner side surface of the through hole of the second pipe body, and the inner side surface of the through hole of the sealing component is abutted to the outer surface of the first pipe body, so that the first pipe body and the second pipe body are sealed.

As a further improvement of the utility model: one end of the sealing component is of a cone structure, a first connecting groove is formed in the end portion of the through hole of the second pipe body, and one end of the sealing component is connected with the first connecting groove.

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

As a further improvement of the utility model: the outer surface of the sealing component 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 component is detachably connected with the second pipe body.

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

As a further improvement of the utility model: the knife ring is of a cone structure, one end of the knife ring is connected with the first connecting groove, and the other end of the knife ring is connected with the connecting screw.

As a further improvement of the utility model: one end of the edge ring is of a cone structure, and the other end of the edge ring is of 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 with the second pipe body.

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

As a further improvement of the utility model: the sealing component comprises a blade ring and a connecting screw, two ends of the blade ring are of a cone structure, a second connecting groove is formed in one end of the connecting screw, one end of the blade ring is connected with the first connecting groove, and the other end of the blade ring is connected with the second connecting groove.

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

As a further improvement of the utility model: the first pipe body comprises a thin pipe and a sleeve, and the thin pipe penetrates through the sleeve and is welded and fixed with the sleeve.

As a further improvement of the utility model: a chamfer is arranged on the inner side of one end of the sleeve.

As a further improvement of the utility model: the tubule adopts the metal material.

As a further improvement of the utility model: and sealing components are arranged at two ends of the first pipe body.

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

this technical scheme's reducing pipe sets up sealing member at the tip of first body, penetrates through first body in the second body, the through-hole medial surface that makes sealing member's surface butt second body to and the surface of the first body of medial surface butt of the through-hole that makes sealing member, thereby reduce the clearance between first body and the second body, first body is higher with second body leakproofness.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of a first tube according to a first embodiment of the present application;

FIG. 2 is a cross-sectional view of a first embodiment of the reducer of the present application;

FIG. 3 is a sectional view of a second embodiment of the reducer pipe of the present application;

fig. 4 is a sectional view showing the connection of a third embodiment of the reducer pipe according to the present invention.

The reference numbers illustrate:

reference numerals	Name(s)	Reference numerals	Name(s)
				1	Edge ring	2	Connecting screw
3	Sleeve pipe	4	Thin tube
				5	First pipe body	6	Second tube
9	Sealing member	10	Chamfering
				11	First connecting groove	12	Second connecting groove

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if the present invention relates to a directional indication (such as up, down, left, right, front, back, 8230 \8230;, 8230;), the directional indication is only used to explain the relative position relationship between the components in a specific posture, the motion situation, etc., and if the specific posture is changed, the directional indication is changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The integral type reducing pipe is mainly applied to high-end import liquid chromatography instruments in the existing market, the form of the integral type reducing pipe is also diversified according to different manufacturer designs, but most of products adopt one end with reducing diameter to be embedded with a small section of PEEK, and then the thin pipe is embedded in the PEEK section through processes such as extrusion, so that the reducing function is realized. The product realizes the sealing function and mainly drives and extrudes the PEEK section through extruding the reducing pipeline, so that the PEEK end face and another contact surface are extruded and deformed, and the effect of sealing the PEEK end face is achieved. Because the requirement of the sealing structure on the flatness of the end face is extremely strict, and the pipe body has a slight external force effect, a gap is easily generated between the end face and the end face of the pipe body, and liquid leakage is caused. Therefore, the conventional liquid chromatography reducer has the problems of unstable sealing effect and poor sealing performance.

Example one

Referring to fig. 1-2, the reducer pipe of the present embodiment includes:

a first tube 5;

the first pipe body 5 penetrates into the second pipe body 6 and is communicated with the second pipe body 6; wherein,

the tip cover of first body 5 is equipped with sealing member 9, through the surface butt of sealing member 9 the through-hole medial surface of second body 6 to and through the medial surface butt of the through-hole of sealing member 9 the surface of first body 5, so that first body 5 with second body 6 is sealed.

Specifically, the reducer pipe of the present embodiment is used for high performance liquid chromatography. The first tube 5, the second tube 6 and the sealing member 9 of this embodiment are all tubular structures, and have through holes inside. Sealing member 9 formula as an organic whole sets up, sealing member 9 cover is established on first body 5, through the through-hole that extrudees sealing member 9 entering second body 6, make the through-hole of sealing member 9 inseparable laminating second body 6, and because sealing member 9 extrusion deformation, sealing member 9 closely embraces the outward appearance of first body 5, thereby reduce the clearance between first body 5 and the second body 6, with this realization is sealed, and because the mode through extrusion butt, be difficult for not hard up under the exogenic action, sealing stability is higher.

The reducing pipe of this embodiment sets up sealing member at the tip of first body, penetrates through first body in the second body, the through-hole medial surface that makes sealing member's surface butt second body to and the surface of the first body of medial surface butt that makes sealing member's through-hole, thereby reduce the clearance between first body and the second body, first body is higher with second body leakproofness.

More specifically, referring to fig. 1, the first tube 5 includes a thin tube 4 and a sleeve 3, the thin tube 4 and the sleeve 3 are made of metal, a chamfer 10 is formed on an inner side of one end of the sleeve 3, and the thin tube 4 penetrates into the sleeve 3 and is welded and fixed to 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 by a special tube cutting machine, then the special tube grinding machine is used for grinding, and then the pipeline at the moment is subjected to through hole forming to manufacture the integrated first tube body 5. Because the chamfer 10 is arranged at the inner side of one end of the sleeve, the requirement of connection and sealing of the soldering tin at the chamfer with the sleeve 3 and the thin tube 4 in the welding manufacturing process can be met, and the welding part is convenient to bend when in use. So welding design, when the structure of first body 5 can avoid adopting sword ring 1 to seal, because the sword ring embraces sleeve pipe 3 tightly, lead to sleeve pipe 3 to receive the extrusion, produce the displacement between sleeve pipe 3 and the tubule 4, or lead to soldering tin to produce the crack.

More specifically, referring to fig. 2, one end of the sealing member 9 is a cone structure, the end of the through hole of the second tube 6 is provided with a first connecting groove 11, and the first connecting groove 11 is an 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 sealing member 9 is detachably connected with the second pipe body 6. With such an arrangement, the sealing member 9 is screwed by hand, the sealing member moves toward the inside of the second pipe body 6, the end of the sealing member 9 can be tightly attached to the first connecting groove 11, the gap between the sealing member 9 and the second pipe body 6 is smaller, and the sealing performance is higher.

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

When the reducer pipe of the embodiment is assembled, one end of the first pipe body 5 is sleeved with the sealing component 9, the sealing component 9 is screwed into the second pipe body 6 through threads, and the sealing component 9 is gradually screwed by using a tool wrench, so that the conical surface at one end of the sealing component 9 is tightly combined with the inner side surface of the through hole of the second pipe body 6; meanwhile, when one end of the sealing component 9 is stressed to be extruded inwards, the sealing component 9 is stressed to be extruded forwards and inwards under the limitation of the first connecting groove 11 in the second pipe body 6, the sleeve 3 of the first pipe body 5 is stressed to be tightly held by the sealing component 9 at the moment, and the sleeve 3 and the thin pipe 4 of the special structure are connected by adopting a welding process, so that no gap exists between the sealing component and the thin pipe. Therefore, the sealing member 9 embraces the first pipe body 5, and the thin pipe 4 in the first pipe body 5 is connected with the special structure sleeve 3 in a welding mode, so that a sealing system is completely formed. In addition, the other end of the first tube 5 may also be provided with the same sealing member 9, which is mounted at a position that is a mirror image of the other end of the first tube 5.

Example two

Referring to fig. 3, the difference between the present embodiment and the first embodiment is that the sealing member 9 includes a knife ring 1 and a connection screw 2, and both the knife ring 1 and the connection screw 2 are sleeved on the surface of the first tube 5. The cutting edge ring 1 is made of stainless steel, the cutting edge ring 1 is of a cone structure, one end of the cutting edge ring 1 is connected with the first connecting groove 11, and the other end of the cutting edge ring 1 is connected with the connecting screw 2.

More specifically, one end of the knife edge 1 is of a cone structure, and the other end of the knife edge 1 is of a flat-head structure. One end of the connecting screw 2 close to the blade ring 1 is also in a flat-head structure, an external thread is arranged on the outer surface of the connecting screw 2, and the connecting screw 2 is detachably connected with the second pipe body 6. So set up, twist connecting screw 2 through the hand, connecting screw butt sword ring 1, consequently at the in-process of the precession second body 6 of connecting screw 2, connecting screw 2 is through the one end of butt sword ring 1 to make the first connecting groove of the other end of sword ring 1 closely laminating second body 6.

EXAMPLE III

Referring to fig. 4, the difference between the second embodiment and the first embodiment is that two ends of the blade ring 1 are in a cone structure, one end of the connection screw 2 is provided with a second connection groove 12, the second connection 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 the reducer pipe is assembled, one end of the first pipe body 5 is sleeved with the connecting screw 2 and the blade ring 1 in sequence, the sealing member 9 is screwed into the second pipe body 6 through threads, and the sealing member 9 is gradually screwed by using a tool wrench, so that the conical surface at one end of the sealing member 9 is tightly combined with the inner side surface of the through hole of the second pipe body 6; meanwhile, when one end of the sealing component 9 is stressed to be extruded inwards, the sealing component 9 is stressed to be extruded forwards and inwards under the limitation of the first connecting groove 11 in the second pipe body 6, the sleeve 3 of the first pipe body 5 is stressed to be tightly held by the sealing component 9 at the moment, and the sleeve 3 and the thin pipe 4 of the special structure are connected by adopting a welding process, so that no gap exists between the sealing component and the thin pipe. Therefore, the sealing member 9 embraces the first pipe body 5, and the thin pipe 4 in the first pipe body 5 is connected with the special structure sleeve 3 in a welding mode, so that a sealing system is completely formed. In addition, the other end of the first tube 5 may also be provided with the same sealing member 9, which is mounted at a position that is a mirror image of the other end of the first tube 5.

In conclusion, after a user screws the connecting screw 3, the blade ring 1 is tightly combined with the integrated first pipe body 5, and the sleeve 3 is tightly combined with the thin pipe 4 by welding, so that high-pressure sealing of the whole pipeline can be realized; in addition, the front end of the first pipe body 5 is a conical chamfer, so that the welding firmness can be enhanced, and the sleeve 4 can be prevented from being too tightly held by the blade ring 1, so that the risk of leakage caused by the fact that the welding line of the two pipes, which is caused by the sleeve 4, is extruded and dislocated is avoided. The structure of this reducing pipe can make the first body 5 of the integral type of different length, different internal diameters as required to replace the effect of the import reducing pipe in the high performance liquid chromatography. In addition, the reducer pipe can be installed without special tools and special fittings, and can be connected by screwing the sealing component by hands, so that the reducer pipe is more convenient for operators to install on site.

The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.

Claims

1. A reducer pipe, comprising:

a first pipe body;

the first pipe body penetrates into the second pipe body and is communicated with the second pipe body; the end part of the first pipe body is sleeved with a sealing component, the outer surface of the sealing component is abutted to the inner side face of the through hole of the second pipe body, and the inner side face of the through hole of the sealing component is abutted to the outer surface of the first pipe body, so that the first pipe body is sealed with the second pipe body.

2. The reducer pipe according to claim 1, wherein one end of the sealing member has a tapered structure, and an end of the through hole of the second pipe body is provided with a first coupling groove to which one end of the sealing member is coupled.

3. The reducer pipe according to claim 2, wherein an outer surface of the sealing member is provided with an external thread, and an inner surface of the through hole of the second pipe body is provided with an internal thread, and the sealing member is detachably connected to the second pipe body.

4. The reducer 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 reducer pipe according to claim 4, wherein the knife ring is of a cone structure, one end of the knife ring is connected with the first connecting groove, and the other end of the knife ring is connected with the connecting screw.

6. The reducer pipe according to claim 1, wherein the first pipe body comprises a thin pipe and a sleeve, and the thin pipe penetrates through the sleeve and is welded and fixed with the sleeve.

7. The reducer pipe according to claim 6, wherein an inner side of one end of the sleeve is provided with a chamfer.

8. The reducer pipe according to claim 6, wherein the fine pipe is made of a metal material.

9. The reducer pipe according to claim 1, wherein both ends of the first pipe body are provided with a sealing member.