CN113324118A

CN113324118A - Pipeline connecting structure

Info

Publication number: CN113324118A
Application number: CN202010129406.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2021-08-31

Abstract

The invention discloses a pipeline connecting structure, which comprises a valve body connecting pipe part, a connecting pipe and a nut; the nut is characterized by further comprising a sealing ring, a gasket and a bushing, wherein the sealing ring, the gasket and the bushing are located in an inner cavity of the nut, the sealing ring and the gasket are fixedly connected or are of an integral structure, and the bushing is sleeved on the outer periphery of the sealing ring; the nut and the bush are sleeved outside the connecting pipe, an expansion section is formed at the end part of the connecting pipe, and a conical surface matching pair is arranged between the expansion section and the bush; one end of the sealing ring abuts against the valve body connecting pipe part to form a first sealing structure, and the other end of the sealing ring abuts against the flaring section to form a second sealing structure. The structural design of the connecting structure reduces the design requirement on the taper of the relevant conical surface, and the sealing effect can be ensured by applying smaller tightening torque, so that the operation is convenient.

Description

Pipeline connecting structure

Technical Field

The invention relates to the technical field of refrigeration control, in particular to a pipeline connecting structure.

Background

The stop valve comprises a valve body and a valve rod, a first connector is arranged on the side portion of the valve body, a second connector is arranged at the bottom of the valve body, the first connector and the second connector are communicated through a valve port, the valve rod is arranged in an inner cavity of the valve body, and the valve rod is connected with the valve body through a thread pair. When the valve rod is rotated, under the action of the thread pair, the valve rod can move up and down along the inner cavity of the valve body so as to close or open the valve opening part, so that a passage between the first connector and the second connector is cut off or conducted.

The movable connection structure of the stop valve and the pipeline generally comprises a connecting pipe end of a valve body of the stop valve, a connecting pipe and a nut; the end face of the connecting pipe end of the valve body forms an outer conical surface, and one end, matched with the connecting pipe end, of the connecting pipe is provided with a horn-type flaring section so as to form a conical surface matched with the outer conical surface of the connecting pipe end; the nut is sleeved outside the connecting pipe and provided with an inner conical surface, and the end of the connecting pipe is also provided with a thread matched with the nut; when the connecting pipe is installed, the nut is connected to the pipe connecting end of the valve body through threads, the inner conical surface of the nut presses the flaring section of the connecting pipe to the outer conical surface of the pipe connecting end by screwing the nut, and the flaring section of the connecting pipe and the outer conical surface of the pipe connecting end form conical surface sealing.

Disclosure of Invention

The invention aims to provide a novel pipeline connecting structure which can also realize sealing reliability.

In order to solve the technical problem, the invention provides a pipeline connecting structure, which comprises a valve body connecting pipe part, a connecting pipe and a nut; the valve body connecting pipe part and the nut are provided with thread pairs which are matched with each other; the nut is characterized by further comprising a sealing ring, a gasket and a bushing, wherein the sealing ring, the gasket and the bushing are located in an inner cavity of the nut, the sealing ring and the gasket are fixedly connected or are of an integral structure, and the bushing is sleeved on the outer periphery of the sealing ring;

the nut and the bush are sleeved outside the connecting pipe, an expansion section is formed at the end part of the connecting pipe, and a conical surface matching pair is arranged between the expansion section and the bush; one end of the sealing ring abuts against the valve body connecting pipe part to form a first sealing structure, and the other end of the sealing ring abuts against the flaring section to form a second sealing structure.

According to the pipeline connecting structure provided by the invention, the pipeline connecting structure is optimally designed to comprise the sealing ring, the gasket and the bushing, the nut and the bushing are sleeved outside the connecting pipe, the end part of the connecting pipe is provided with the flaring section, a conical surface matching pair is arranged between the flaring section and the bushing, one end of the sealing ring is abutted against the connecting pipe part of the valve body to form a first sealing structure, and the other end of the sealing ring is abutted against the flaring section to form a second sealing structure, so that the sealing reliability can be realized.

Drawings

FIG. 1 is a schematic cross-sectional view of one embodiment of a shut-off valve and line connection provided by the present invention;

FIG. 2 is a partial enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic structural view of the connection tube in FIG. 1;

FIG. 4 is a schematic structural view of the nut of FIG. 2;

FIG. 5 is a cross-sectional view of the nut shown in FIG. 4;

FIG. 6 is a schematic structural view of the seal ring of FIG. 2;

FIG. 7 is a cross-sectional view of the seal ring of FIG. 6;

FIG. 8 is a schematic view of the washer of FIG. 2;

FIG. 9 is a cross-sectional view of the gasket shown in FIG. 8;

FIG. 10 is a schematic view of the bushing of FIG. 2;

FIG. 11 is a cross-sectional view of the bushing of FIG. 10;

fig. 12 is a schematic sectional view of another embodiment of the connection structure of the shut-off valve and the pipeline according to the present invention.

Description of reference numerals:

the valve body 110, the valve port portion 111, the valve body connecting pipe portion 112, the outer conical surface 1121, the lower connecting pipe 113, the valve stem 120, and the bonnet 130;

a connection tube 200, a flared section 210, a first external tapered surface 211;

nut 300, inner tapered surface 310;

a seal ring 400, a large diameter portion 410, a small diameter portion 420;

washer 500, inner tapered surface 510;

a bushing 600, a tapered portion 610, a second outer tapered surface 611, a round sleeve portion 620, a first round hole 630, a tapered hole 640, a second round hole 650;

thread pair S1;

the conical surface is matched with the auxiliary V1 and is matched with the auxiliary V2 in a sealing way;

first sealing structures M1, M1', second sealing structure M2.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Without loss of generality, the pipeline connecting structure is used for connecting the stop valve and the pipeline as an example, and the pipeline connecting structure is similar to the pipeline connecting structure in other similar application occasions and is not described in detail.

Referring to fig. 1 and 2, fig. 1 is a schematic cross-sectional view illustrating a connection structure of a stop valve and a pipeline according to an embodiment of the present invention; fig. 2 is a partially enlarged view of a portion a in fig. 1.

The shut-off valve includes a valve body 110, a valve stem 120, and a bonnet 130; wherein, a valve body connecting pipe part 112 with a flow passage is formed at the side part of the valve body 110, a connecting part connected with a lower connecting pipe 113 is formed at the lower part of the valve body 110, and a valve opening part 111 is formed in the valve body 110; the valve stem 120 is inserted into the valve chamber from the upper opening of the valve body 110 by its threaded portion, and the valve stem 120 is rotated to move up and down along the inner chamber of the valve body 110, thereby closing or opening the valve port portion 111 to block or communicate the passage formed between the valve body connecting pipe portion 112 and the lower connecting pipe 113.

The upper opening of the valve body 110 is sealed by a bonnet 130.

In practical applications, the lower connecting pipe 113 of the stop valve is usually welded to the valve body 110, and the valve body connecting pipe 112 is connected to other pipelines, such as air conditioning pipelines, by using a movable connection structure, so as to facilitate installation with an indoor unit.

The focus of the present invention is on the connection structure of the valve body connecting pipe portion 112 of the shut-off valve and the pipeline, which will be described in detail hereinafter.

In this embodiment, the coupling structure includes the valve body attachment pipe portion 112 of the valve body 110, the coupling pipe 200, and the nut 300, wherein the nut 300 has an internal threaded portion, the valve body attachment pipe portion 112 has an external threaded portion that is threadedly engaged with the internal threaded portion, and the nut 300 and the valve body attachment pipe portion 112 are threadedly coupled by a thread pair S1 formed by the internal threaded portion and the external threaded portion.

The connecting structure further comprises a sealing ring 400, a gasket 500 and a bushing 600, wherein the gasket 500 and the bushing 600 are sleeved in the nut 300.

The seal ring 400 includes a large diameter portion 410 and a small diameter portion 420 connected to the large diameter portion 410, that is, the seal ring 400 is a stepped columnar structure, the small diameter portion 420 of the seal ring 400 is inserted into the gasket 500, and the large diameter portion 410 is inserted into the bushing 600, it can be understood that the seal ring 400 is disposed in the inner cavity of the nut 300.

The end of the connection pipe 200 is formed with a flared section 210, the flared section 210 has a tapered structure and a first external tapered surface 211, the end of the connection pipe 200 provided with the flared section 210 is inserted into the nut 300 and the bush 600, a tapered surface mating pair V1 is formed between the flared section 210 and the bush 600, and a sealing mating pair V2 is formed between the bush 600 and the nut 300. In a specific embodiment, the seal engaging pair V2 is also a tapered surface engaging pair structure, but it is understood that the present invention is not limited thereto.

It should be noted that the above-mentioned tapered surface matching pair refers to two components respectively having two matching tapered surfaces, and when a moment is applied to one component, the tapered surface of the component can be pressed against the tapered surface of the other component to transmit the moment.

In a state where the nut 300 and the valve body connecting pipe portion 112 are screwed together by the screw pair S1, a first seal structure M1 is formed between the valve body connecting pipe portion 112 and the small diameter portion 420 of the seal ring 400, and a second seal structure M2 is formed between the flared end 210 of the connecting pipe 200 and the large diameter portion 410 of the seal ring 400.

As described above, in the process of screwing the nut 300, the small diameter portion 420 of the sealing ring 400 and the valve body connecting pipe portion 112 are pressed and sealed by the pressing fit of the tapered surface matching pair V1 and the sealing matching pair V2, and the flared end 210 of the connecting pipe 200 and the large diameter portion 410 of the sealing ring 400 are pressed and sealed, so that the connecting structure is provided with two seals by the arrangement of related structures, and the two seals are not tapered surface seals. Since the applied tightening torque is small, the situation that the thread of the valve body connecting pipe portion 112 is screwed to be damaged can be avoided.

In the illustrated example, the sealing ring 400 has a stepped cylindrical structure, and it is understood that in other embodiments, the sealing ring 400 may have other structures, not limited to the illustrated structure, and regardless of the specific structure of the sealing ring 400, one end thereof may abut against the valve body connecting pipe portion 112 to form a first sealing structure, and the other end thereof may abut against the flared section 210 of the connecting pipe 200 to form a second sealing structure.

In the illustrated example, the seal ring 400 and the gasket 500 are separate structures and then fixedly connected, and in actual installation, the seal ring 400 and the gasket 500 may be integrated.

In addition, in this embodiment, a seal-fitting pair V2 is formed between the bushing 600 and the nut 300, it being understood that it is also possible to practice the arrangement without forming a seal between the bushing 600 and the nut 300.

In practice, the nut 300 is usually made of copper material, such as brass, and based on this, the bushing 600 is also made of copper material in this embodiment; in order to reduce the cost, in this embodiment, the connection pipe 200 is made of aluminum, and since the connection pipe 200 is in contact with the nut 300 and the bushing 600, in order to avoid galvanic corrosion caused by potential difference in copper-aluminum connection, in this embodiment, a coating for preventing galvanic corrosion is formed at least at a portion of the outer circumferential wall of the connection pipe 200 that is engaged with the nut 300 and the bushing 600.

Referring to fig. 3 to 11 together, fig. 3 is a schematic structural diagram of the connecting tube in fig. 1; FIG. 4 is a schematic structural view of the nut of FIG. 2; FIG. 5 is a cross-sectional view of the nut shown in FIG. 4; FIG. 6 is a schematic structural view of the seal ring of FIG. 2; FIG. 7 is a cross-sectional view of the seal ring of FIG. 6; FIG. 8 is a schematic view of the washer of FIG. 2; FIG. 9 is a cross-sectional view of the gasket shown in FIG. 8; FIG. 10 is a schematic view of the bushing of FIG. 2; fig. 11 is a cross-sectional view of the bushing shown in fig. 10.

In this embodiment, the inner cavity of the nut 300 includes a first hole section engaged with the body of the connection pipe 200, a tapered hole section connected to the first hole section, and a second hole section connected to the tapered hole section, and the internal thread portion is formed at the second hole section, it can be understood that the diameter of the second hole section is adapted to the outer diameter of the valve body connection pipe portion 112 of the valve body 110.

The bore wall surface of the tapered bore section is the internal tapered surface 310 of the nut 300.

The bushing 600 includes a tapered portion 610 and a circular sleeve portion 620 connected to the tapered portion 610, the tapered portion 610 having a second outer tapered surface 611.

After the bushing 600 is inserted into the nut 300, the tapered portion 610 of the bushing is engaged with the tapered hole section of the nut 300, and the circular sleeve 620 is engaged with the second hole section of the nut 300.

It will be appreciated that the second outer tapered surface 611 of the tapered portion 610 and the inner tapered surface 310 of the nut 300 form the aforementioned sealing engagement pair V2.

In this embodiment, the inner bore of the bushing 600 includes a first circular bore 630, a tapered bore 640, and a second circular bore 650, which are connected in series, with the first circular bore 630 and the tapered bore 640 generally corresponding to the tapered portion 610 and the second circular bore 650 corresponding to the round sleeve portion 620.

After the connection pipe 200, the nut 300 and the bushing 600 are engaged, the first hole section of the nut 300 and the first circular hole 630 of the bushing 600 are engaged with the pipe body of the connection pipe 200, and the flared section 210 of the connection pipe 200 is engaged with the tapered hole 640 of the bushing 600, that is, the second outer tapered surface 211 of the flared section 210 and the tapered hole wall surface of the tapered hole 640 form the aforementioned tapered surface engagement pair V1.

Referring to fig. 2, when the nut 300 is tightened, the inner tapered surface 310 of the nut 300 presses against the second outer tapered surface 611 of the bushing 600, so that the tapered hole wall surface of the tapered hole 640 of the bushing 600 presses against the flared end 210 of the connection pipe 200, and finally acts on the seal ring 400, so that the small diameter portion 420 of the seal ring presses against and seals against the valve body connection pipe portion 112, and the flared end 210 presses against and seals against the large diameter portion 410 of the seal ring 400.

In this embodiment, in a state where the nut 300 and the valve body connecting pipe portion 112 are screwed by the screw pair S1, the end surface of the flared end 210 of the connecting pipe 200 abuts against the end surface of the large diameter portion 410 of the seal ring 400 to form the second seal structure M2.

The taper of the first outer tapered surface 211 of the flared section 210 of the coupling tube 200 is less than the taper of the inner tapered surface 310 of the nut 300, based on the provision of the bushing 600 between the coupling tube 200 and the nut 300.

Compared with the prior art, in the structure provided by the embodiment, because the first outer conical surface 211 of the flared section 210 is not directly matched with the inner conical surface 310 of the nut 300, the conicity of the flared section 210 of the connecting pipe 200 can be designed to be relatively smaller without keeping the same conicity, and thus, when the connecting pipe 200 is made of aluminum, because the flaring degree is relatively smaller, the flaring is not easy to crack.

Obviously, since the flared tube 210 of the connection tube 200 is to be fitted with the tapered hole 640 of the bushing 600, when assembling, the bushing 600 is assembled with the nut 300, and then the end of the connection tube 200 without the flared section 210 is inserted into the assembled nut 300 and bushing 600 from the second hole section of the nut 300 to the direction of the first hole section, so that the flared section 210 is fitted with the tapered hole 640.

In a specific scheme, the circular sleeve part 620 of the bushing 600 is in clearance fit with the nut 300, the nut 300 is in clearance fit with the connecting pipe 200, and the bushing 600 is also in clearance fit with the connecting pipe 200, so that the assembly difficulty is reduced.

As shown in fig. 2, in this embodiment, the end of the valve body connecting pipe portion 112 has an outer tapered surface 1121, the end of the washer 500 facing the valve body connecting pipe portion 112 has an inner tapered surface 510 matching with the outer tapered surface 1121, and the outer end surface of the valve body connecting pipe portion 112 abuts against the end surface of the small diameter portion 420 of the seal ring 400 in the state where the nut 300 and the valve body connecting pipe portion 112 are screwed by the screw pair S1 to form a first seal structure M1.

The end of the valve body connecting pipe portion 112 is tapered to facilitate sealing between the valve body connecting pipe portion 112 and the seal ring 400 during connection.

In another embodiment, as shown in fig. 12, in a state where the nut 300 and the valve body connecting pipe portion 112 are screwed together by the screw pair S1, the end portion of the valve body connecting pipe portion 112 may be inserted into the small diameter portion 420 of the seal ring 400, and the inner bore wall surface of the small diameter portion 420 may abut against the outer tapered surface of the valve body connecting pipe portion 112 to form a first seal structure M1'.

In a specific embodiment, the small diameter portion 420 of the sealing ring 400 is in interference fit with the gasket 500, so that the sealing effect can be improved, and during assembly, the sealing ring 400 and the gasket 500 can be assembled with the connecting pipe 200, the nut 300 and the bushing 600 after being tightly fitted.

Wherein the large diameter portion 410 is clearance-fitted with the bushing 600 for convenient assembly.

In a specific scheme, the washer 600 and the nut 300 can also be in clearance fit to facilitate assembly, and of course, interference fit is also possible. Among them, the gasket 600 is also made of a copper material to improve the strength and reliability of the connection structure.

In the concrete scheme, sealing washer 400 can be made for the plastics material, preferred PTFE material, also can select for use the rubber material, has certain elasticity, can improve its and flaring section 210 and valve body and connect the sealed effect between the pipe portion 112.

The pipe connection structure according to the present invention is exemplified by a pipe connection structure system including a shutoff valve and a pipe, and the valve body connecting pipe portion of the shutoff valve may be a valve body connecting pipe portion of the shutoff valve.

The above description details a pipe connection structure provided by the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A pipeline connecting structure comprises a valve body connecting pipe part, a connecting pipe and a nut; the valve body connecting pipe part and the nut are provided with thread pairs which are matched with each other, and the valve body connecting pipe part and the nut are characterized by further comprising a sealing ring, a gasket and a lining, wherein the sealing ring, the gasket and the lining are positioned in an inner cavity of the nut, the sealing ring and the gasket are fixedly connected or are of an integrated structure, and the lining is sleeved on the peripheral part of the sealing ring;

the nut and the bush are sleeved outside the connecting pipe, an expansion section is formed at the end part of the connecting pipe, and a conical surface matching pair is arranged between the expansion section and the bush;

one end of the sealing ring abuts against the valve body connecting pipe part to form a first sealing structure, and the other end of the sealing ring abuts against the flaring section to form a second sealing structure.

2. The pipe connection according to claim 1, wherein the seal ring includes a large diameter portion and a small diameter portion connected to the large diameter portion, the small diameter portion is inserted into the gasket, the large diameter portion is inserted into the bushing, the first seal structure is formed between the valve body connecting pipe portion and the small diameter portion, and the second seal structure is formed between the flared section and the large diameter portion.

3. The piping connection structure according to claim 1, wherein the nut is a nut made of a copper material, the bush is a bush made of a copper material, and the connection pipe is a connection pipe made of an aluminum material; the connecting pipe is formed with a coating layer for preventing galvanic corrosion at least on an outer peripheral wall that fits the nut and the bush.

4. The pipeline connecting structure according to claim 2, wherein the bushing includes a tapered portion and a cylindrical portion connected to the tapered portion, the cylindrical portion is engaged with the inner bore of the nut, and an outer conical surface of the tapered portion and an inner conical surface of the nut form the sealing engagement pair;

the bush has first round hole, bell mouth and the second round hole of connecting in order, the internal diameter of first round hole with the external diameter adaptation of connecting pipe, the internal diameter of second round hole with the external diameter adaptation of major diameter portion, the bell mouth wall of bell mouth with the external conical surface of flaring section forms the conical surface cooperation is vice.

5. The pipe connection according to claim 4, wherein the cylindrical sleeve portion is in clearance fit with the nut, the nut is in clearance fit with the connection pipe, and the bushing is in clearance fit with the connection pipe.

6. The tubing connection according to claim 4, wherein the taper of the outer tapered surface of the flared section is less than the taper of the inner tapered surface of the nut.

7. The pipe connection structure according to any one of claims 1 to 6, wherein an end surface of the flared section abuts an end surface of the large diameter portion to form the second seal structure in a state where the nut and the valve body joint portion are screwed together by the screw pair.

8. The piping connection structure according to claim 7, wherein the end of said valve body connecting pipe portion has an external tapered surface, and the end of said gasket facing said valve body connecting pipe portion has an internal tapered surface fitted with said external tapered surface; and under the state that the nut is in threaded connection with the valve body connecting pipe part through the thread pair, the outer end surface of the valve body connecting pipe part is abutted against the end surface of the small-diameter part to form the first sealing structure.

9. The piping connection structure according to claim 7, wherein the end of said valve body connecting pipe portion has an external tapered surface, and the end of said gasket facing said valve body connecting pipe portion has an internal tapered surface fitted with said external tapered surface; the end part of the valve body connecting pipe part extends into the small-diameter part, and the inner hole wall surface of the small-diameter part is abutted with the outer conical surface to form the first sealing structure.

10. The pipe connection according to any one of claims 2 to 6, wherein the small diameter portion is in interference fit with the washer, and the large diameter portion is in clearance fit with the bush.

11. The pipe connection structure according to any one of claims 1 to 6, wherein the seal ring is made of a plastic material or a rubber material.