A pipeline connection structure

Abstract

The present invention discloses a pipeline connection structure, which includes a valve body connection part, a connecting pipe and a nut; it further includes a sealing ring, a washer and a bushing. The sealing ring, the washer and the bushing are located in the inner cavity of the nut. The sealing ring is fixedly connected with the washer or is an integral structure. The bushing is sleeved on the outer peripheral part of the sealing ring. The nut and the bushing are sleeved on the connecting pipe. An expanded section is formed at the end of the connecting pipe, and a conical surface mating pair is provided between the expanded section and the bushing. One end of the sealing ring abuts against the valve body connection part to form a first sealing structure, and the other end abuts against the expanded section to form a second sealing structure. The structural design of this connection structure reduces the design requirements for the taper of the relevant conical surface, and a smaller tightening torque can ensure the sealing effect, which is convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration control, and particularly to a pipeline connection structure. Background Art

[0002] The globe valve includes a valve body and a valve stem. A first interface is provided on the side of the valve body, and a second interface is provided at the bottom. The two are communicated through a valve port part. The valve stem is arranged in the inner cavity of the valve body, and the valve stem is connected to the valve body through a thread pair. When the valve stem is rotated, under the action of the thread pair, the valve stem can move up and down along the inner cavity of the valve body to close or open the valve port part, so as to cut off or conduct the passage between the first interface and the second interface.

[0003] The movable connection structure between the globe valve and the pipeline usually includes a pipe connection end of the globe valve body, a connecting pipe and a nut; the end face of the pipe connection end of the valve body forms an outer conical surface, and one end of the connecting pipe that cooperates with the pipe connection end is provided with a flared section in the shape of a horn to form a conical surface that cooperates with the outer conical surface of the pipe connection end; the nut is sleeved outside the connecting pipe, and the nut has an inner conical surface, and the pipe connection end also has a thread that cooperates with the nut; during installation, the nut is threadedly connected to the pipe connection end of the valve body, and by tightening the nut, the inner conical surface of the nut presses the flared section of the connecting pipe against the outer conical surface of the pipe connection end, so that the flared section of the connecting pipe and the outer conical surface of the pipe connection end form a conical surface seal. Summary of the Invention

[0004] The purpose of the present invention is to provide a new pipeline connection structure that can also achieve sealing reliability.

[0005] To solve the above technical problems, the present invention provides a pipeline connection structure, including a valve body pipe connection part, a connecting pipe and a nut; the valve body pipe connection part and the nut have a mutually cooperating thread pair; it also includes a sealing ring, a washer and a bushing. The sealing ring, the washer and the bushing are located in the inner cavity of the nut. The sealing ring is fixedly connected to the washer or is an integral structure. The bushing is sleeved on the outer peripheral part of the sealing ring;

[0006] The nut and the bushing are sleeved outside the connecting pipe. The end of the connecting pipe is formed with a flared section, and there is a conical surface mating pair between the flared section and the bushing; one end of the sealing ring abuts against the valve body pipe connection part to form a first sealing structure, and the other end abuts against the flared section to form a second sealing structure.

[0007] The pipeline connection structure provided by the present invention optimizes the design of the pipeline connection structure, making it include a sealing ring, a washer and a bushing. The nut and the bushing are sleeved outside the connecting pipe. The end of the connecting pipe is formed with a flared section, and there is a conical surface mating pair between the flared section and the bushing. One end of the sealing ring abuts against the valve body pipe connection part to form a first sealing structure, and the other end abuts against the flared section to form a second sealing structure, and it can also achieve sealing reliability. Brief Description of the Drawings

[0008] Figure 1 It is a schematic cross-sectional view of a specific embodiment of the connection structure between the globe valve and the pipeline provided by the present invention;

[0009] Figure 2 It is Figure 1 a partial enlarged view of part A in

[0010] Figure 3 It is Figure 1 a schematic structural view of the connecting pipe in

[0011] Figure 4 It is Figure 2 a schematic structural view of the nut in

[0012] Figure 5 It is Figure 4 a schematic cross-sectional view of the nut shown in

[0013] Figure 6 It is Figure 2 a schematic structural view of the sealing ring in

[0014] Figure 7 It is Figure 6 a schematic cross-sectional view of the sealing ring shown in

[0015] Figure 8 It is Figure 2 a schematic structural view of the washer in

[0016] Figure 9 It is Figure 8 a schematic cross-sectional view of the washer shown in

[0017] Figure 10 It is Figure 2 a schematic structural view of the bushing in

[0018] Figure 11 It is Figure 10 a schematic cross-sectional view of the bushing shown in

[0019] Figure 12 It is a schematic cross-sectional view of another specific embodiment of the connection structure between the globe valve and the pipeline provided by the present invention.

[0020] Description of the Reference Numerals:

[0021] Valve body 110, valve port part 111, valve body connection part 112, outer conical surface 1121, lower connection pipe 113, valve stem 120, valve cap 130;

[0022] Connecting pipe 200, flared section 210, first outer conical surface 211;

[0023] Nut 300, inner conical surface 310;

[0024] Sealing ring 400, large-diameter portion 410, small-diameter portion 420;

[0025] Washer 500, inner conical surface 510;

[0026] Bushing 600, conical portion 610, second outer conical surface 611, circular sleeve portion 620, first circular hole 630, conical hole 640, second circular hole 650;

[0027] Thread pair S1;

[0028] Conical surface mating pair V1, sealing mating pair V2;

[0029] First sealing structures M1, M1', second sealing structure M2. Specific embodiments

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Without loss of generality, this article takes the application of the pipeline connection structure in the connection between the stop valve and the pipeline as an example for illustration. In other similar application scenarios, it is similar and will not be elaborated further.

[0032] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic cross-sectional view of a specific embodiment of the connection structure between the stop valve and the pipeline provided by the present invention; Figure 2 is Figure 1 a partial enlarged view of part A in

[0033] The stop valve includes a valve body 110, a valve stem 120 and a valve cap 130; wherein, a valve body connection part 112 with a flow passage is formed on the side of the valve body 110, a connection part for connecting with a lower connection pipe 113 is provided at the lower part of the valve body 110, and a valve port part 111 is also formed in the valve body 110; the valve stem 120 is inserted into the valve cavity through its threaded part from the upper opening of the valve body 110, and by rotating the valve stem 120, it can move up and down along the inner cavity of the valve body 110 to close or open the valve port part 111, so as to cut off or connect the passage formed between the valve body connection part 112 and the lower connection pipe 113.

[0034] The upper opening of the valve body 110 is sealed by the valve cap 130.

[0035] In practical applications, the lower connection pipe 113 of the stop valve is usually welded and fixed to the valve body 110, and the valve body connection part 112 is connected to other pipelines by adopting a movable connection structure. For example, in an air-conditioning pipeline, it is convenient to install with an indoor unit.

[0036] The focus of the present invention lies in the connection structure between the valve body connection part 112 of the stop valve and the pipeline, which will be described in detail below.

[0037] In this embodiment, the connection structure includes the valve body connection part 112 of the valve body 110, the connecting pipe 200, and the nut 300. Among them, the nut 300 has an internal thread part, and the valve body connection part 112 has an external thread part that is thread - fitted with the internal thread part. The nut 300 and the valve body connection part 112 are thread - connected through the thread pair S1 formed by the internal thread part and the external thread part.

[0038] The connection structure further includes a sealing ring 400, a washer 500, and a bushing 600. Among them, both the washer 500 and the bushing 600 are sleeved inside the nut 300.

[0039] The sealing ring 400 includes a large - diameter part 410 and a small - diameter part 420 connected to the large - diameter part 410. That is, the sealing ring 400 is a stepped columnar structure. The small - diameter part 420 of the sealing ring 400 is inserted into the washer 500, and the large - diameter part 410 is inserted into the bushing 600. It can be understood that the sealing ring 400 is placed inside the cavity of the nut 300.

[0040] An expanded - mouth section 210 is formed at the end of the connecting pipe 200. The expanded - mouth section 210 has a conical structure with a first external conical surface 211. The end of the connecting pipe 200 provided with the expanded - mouth section 210 is inserted inside the nut 300 and the bushing 600. And a conical - surface mating pair V1 is formed between the expanded - mouth section 210 and the bushing 600, and a sealing mating pair V2 is formed between the bushing 600 and the nut 300. In a specific solution, the sealing mating pair V2 is also a conical - surface mating - pair structure. It can be understood that in actual setting, it is not limited to this.

[0041] It should be noted here that the above - mentioned conical - surface mating pair refers to that two components respectively have two mutually adapted conical surfaces. When a torque is applied to one component, the conical surface of this component can press against the conical surface of the other component to transmit the torque. The conical - surface mating pair involved in this article is not limited to the case where the two conical surfaces are completely in contact.

[0042] In the state where the nut 300 and the valve body connection part 112 are thread - connected through the thread pair S1, a first sealing structure M1 is formed between the valve body connection part 112 and the small - diameter part 420 of the sealing ring 400, and a second sealing structure M2 is formed between the expanded - mouth section 210 of the connecting pipe 200 and the large - diameter part 410 of the sealing ring 400.

[0043] As described above, in the connection structure provided by the present invention, during the process of tightening the nut 300, through the pressing fit of the conical surface mating pair V1 and the sealing mating pair V2, the small-diameter portion 420 of the sealing ring 400 is pressed and sealed with the valve body connection portion 112, and the flared section 210 of the connecting pipe 200 is pressed and sealed with the large-diameter portion 410 of the sealing ring 400. In this way, the connection structure forms two seals through the setting of relevant structures. Neither of the two seal structures is in the form of a conical surface seal. Compared with the prior art, the accuracy requirements for the conical surface mating pair are reduced, the processing cost can be reduced, and at the same time, the sealing requirement can be achieved by applying a relatively small tightening torque, which is more convenient to operate and has a better sealing effect. Since the applied tightening torque is small, the situation where the thread of the valve body connection portion 112 is damaged and stripped can be avoided.

[0044] In the illustrated example, the sealing ring 400 is a stepped columnar structure. It can be understood that in other embodiments, the sealing ring 400 can also be of other structures, not limited to the illustration. Regardless of the specific structure of the sealing ring 400, one end thereof can abut against the valve body connection portion 112 to form a first sealing structure, and the other end thereof can abut against the flared section 210 of the connecting pipe 200 to form a second sealing structure.

[0045] In the illustrated example, the sealing ring 400 and the washer 500 are of a split structure and then fixedly connected. In actual setting, the sealing ring 400 and the washer 500 can also be of an integral structure.

[0046] In addition, in this embodiment, a sealing mating pair V2 is formed between the bushing 600 and the nut 300. It can be understood that in actual setting, it is also feasible that no seal is formed between the bushing 600 and the nut 300.

[0047] In practical applications, the nut 300 is usually made of copper material, such as brass. On this basis, in this embodiment, the bushing 600 is also made of copper material; to reduce costs, in this embodiment, the connecting pipe 200 is made of aluminum material. Since the connecting pipe 200 is in contact with the nut 300 and the bushing 600, to avoid electro-corrosion caused by the potential difference between copper and aluminum connections, in this embodiment, a coating for preventing electro-corrosion is formed on at least the outer peripheral wall portion of the connecting pipe 200 that cooperates with the nut 300 and the bushing 600.

[0048] Please also refer to Figures 3 to 11 , Figure 3 for Figure 1 the structural schematic diagram of the connecting pipe in Figure 4 for Figure 2 the structural schematic diagram of the nut in Figure 5 for Figure 4 the cross-sectional schematic diagram of the nut shown in Figure 6 for Figure 2 the structural schematic diagram of the sealing ring in Figure 7 forFigure 6 Schematic cross-sectional view of the shown sealing ring; Figure 8 is Figure 2 Schematic structural view of the washer in Figure 9 is Figure 8 Schematic cross-sectional view of the shown washer; Figure 10 is Figure 2 Schematic structural view of the bushing in Figure 11 is Figure 10 Schematic cross-sectional view of the shown bushing.

[0049] In this embodiment, the inner cavity of the nut 300 includes a first hole section that mates with the tube body of the connecting tube 200, a tapered hole section connected to the first hole section, and a second hole section connected to the tapered hole section. The aforementioned internal thread portion is formed in 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 portion 112 of the valve body 110.

[0050] The hole wall surface of the tapered hole section is the inner tapered surface 310 of the nut 300.

[0051] The bushing 600 includes a tapered portion 610 and a round sleeve portion 620 connected to the tapered portion 610. The tapered portion 610 has a second outer tapered surface 611.

[0052] After the bushing 600 is sleeved inside the nut 300, its tapered portion 610 mates with the tapered hole section of the nut 300, and the round sleeve portion 620 mates with the second hole section of the nut 300.

[0053] Obviously, 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 mating pair V2.

[0054] In this embodiment, the inner hole of the bushing 600 includes a first round hole 630, a tapered hole 640, and a second round hole 650 that are sequentially connected. In the illustrated solution, the first round hole 630 and the tapered hole 640 generally correspond to the tapered portion 610, and the second round hole 650 corresponds to the round sleeve portion 620.

[0055] After the connecting tube 200, the nut 300, and the bushing 600 are assembled, the first hole section of the nut 300, the first round hole 630 of the bushing 600, and the tube body of the connecting tube 200 are mated. The flared section 210 of the connecting tube 200 mates 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 mating pair V1.

[0056] Combined with Figure 2, when tightening the nut 300, the inner conical surface 310 of the nut 300 presses against the second outer conical surface 611 of the bushing 600, so that the conical hole wall surface of the conical hole 640 of the bushing 600 presses against the flared section 210 of the connecting pipe 200, and finally acts on the sealing ring 400, making its small-diameter part 420 press against and seal with the valve body connection part 112, and the flared section 210 press against and seal with the large-diameter part 410 of the sealing ring 400.

[0057] In this embodiment, in the state where the nut 300 and the valve body connection part 112 are threadedly connected through the thread pair S1, the end surface of the flared section 210 of the connecting pipe 200 abuts against the end surface of the large-diameter part 410 of the sealing ring 400 to form the second sealing structure M2.

[0058] On the basis of arranging the bushing 600 between the connecting pipe 200 and the nut 300, the taper of the first outer conical surface 211 of the flared section 210 of the connecting pipe 200 is set to be smaller than the taper of the inner conical surface 310 of the nut 300.

[0059] Compared with the prior art, in the structure provided by this embodiment, since the first outer conical surface 211 of the flared section 210 does not directly cooperate with the inner conical surface 310 of the nut 300, the tapers of the two do not need to be kept consistent, and the taper of the flared section 210 of the connecting pipe 200 can be designed to be relatively small. In this way, when the connecting pipe 200 is an aluminum pipe, because its flaring degree is relatively small, it is not easy to produce the situation of flaring cracking.

[0060] Obviously, since the flared pipe 210 of the connecting pipe 200 needs to cooperate with the conical hole 640 of the bushing 600, during assembly, first assemble the bushing 600 and the nut 300, and then insert the end of the connecting pipe 200 without the flared section 210 into the assembled nut 300 and bushing 600 from the second hole section of the nut 300 to the first hole section, so that the flared section 210 cooperates with the conical hole 640.

[0061] In a specific solution, the circular sleeve part 620 of the bushing 600 has a clearance fit with the nut 300, the nut 300 has a clearance fit with the connecting pipe 200, and the bushing 600 also has a clearance fit with the connecting pipe 200 to reduce the assembly difficulty.

[0062] As Figure 2 shown, in this embodiment, the end of the valve body connection part 112 has an outer conical surface 1121, and one end of the washer 500 facing the valve body connection part 112 has an inner conical surface 510 adapted to the outer conical surface 1121. In the state where the nut 300 and the valve body connection part 112 are threadedly connected through the thread pair S1, the outer end surface of the valve body connection part 112 abuts against the end surface of the small-diameter part 420 of the sealing ring 400 to form the first sealing structure M1.

[0063] The end of the valve body connection part 112 is configured as a conical structure, which is beneficial to forming a seal between the valve body connection part 112 and the sealing ring 400 during connection.

[0064] In other embodiments, such as Figure 12 shown, when the nut 300 and the valve body connection part 112 are in a threaded connection state through the thread pair S1, the end of the valve body connection part 112 can also extend into the small-diameter part 420 of the sealing ring 400, and the inner wall surface of the inner hole of the small-diameter part 420 abuts against the outer conical surface of the valve body connection part 112 to form the first sealing structure M1'.

[0065] In a specific solution, the small-diameter part 420 of the sealing ring 400 is in interference fit with the washer 500. In this way, the sealing effect can be improved. During assembly, the sealing ring 400 and the washer 500 can be tightly fitted first, and then assembled with the connecting pipe 200, nut 300, and bushing 600 that have been assembled.

[0066] Among them, the large-diameter part 410 is in clearance fit with the bushing 600 to facilitate assembly.

[0067] In a specific solution, the washer 600 and the nut 300 can also be in clearance fit to facilitate assembly. Of course, interference fit is also possible. Among them, the washer 600 is also made of copper material to improve the strength and reliability of the connection structure.

[0068] In a specific solution, the sealing ring 400 can be made of plastic material, preferably PTFE material, or rubber material. It has a certain elasticity and can improve the sealing effect between it and the flared section 210 and the valve body connection part 112.

[0069] It should be noted that the pipeline connection structure provided by the present invention is exemplified by a pipeline connection structure composed of a globe valve and a pipeline. The valve body connection part is the valve body connection part of the globe valve. Similarly, this pipeline connection structure can also be a connection structure composed of other joints and pipelines.

[0070] The above has introduced in detail a pipeline connection structure provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A pipeline connection structure, comprising a valve body connection part, a connecting pipe and a nut; the valve body connection part and the nut have a mutually matching thread pair, characterized in that, It further includes a sealing ring, a washer and a bushing. The sealing ring, the washer and the bushing are located in the inner cavity of the nut. The bushing is sleeved on the outer peripheral part of the sealing ring. The sealing ring includes a large-diameter part and a small-diameter part connected to the large-diameter part. The small-diameter part is inserted into the washer, and the washer is in interference fit or clearance fit with the nut; The nut and the bushing are sleeved on the connecting pipe. A flared section is formed at the end of the connecting pipe, and a conical surface mating pair is provided between the flared section and the bushing; One end of the sealing ring abuts against the valve body connection part to form a first sealing structure, and the other end abuts against the flared section to form a second sealing structure.

2. The pipeline connection structure according to claim 1, characterized in that, The large-diameter part is inserted into the bushing. The first sealing structure is formed between the valve body connection part and the small-diameter part, and the second sealing structure is formed between the flared section and the large-diameter part.

3. The pipeline connection structure according to claim 1, characterized in that, The nut is a nut made of copper, the bushing is a bushing made of copper, and the connecting pipe is a connecting pipe made of aluminum; at least on the outer peripheral wall of the connecting pipe that cooperates with the nut and the bushing, a coating for preventing electrochemical corrosion is formed.

4. The pipeline connection structure according to claim 2, characterized in that, The bushing includes a conical part and a round sleeve part connected to the conical part. The round sleeve part is in fit with the inner hole of the nut, and the outer conical surface of the conical part and the inner conical surface of the nut form the sealing mating pair; The bushing has a first round hole, a conical hole and a second round hole connected in sequence. The inner diameter of the first round hole is adapted to the outer diameter of the connecting pipe, the inner diameter of the second round hole is adapted to the outer diameter of the large-diameter part, and the conical hole wall surface of the conical hole and the outer conical surface of the flared section form the conical surface mating pair.

5. The pipeline connection structure according to claim 4, wherein The round sleeve part is in clearance fit with the nut, the nut is in clearance fit with the connecting pipe, and the bushing is also in clearance fit with the connecting pipe.

6. The pipeline connection structure according to claim 4, wherein, The taper of the outer conical surface of the flared section is smaller than the taper of the inner conical surface of the nut.

7. The pipeline connection structure according to any one of claims 1-6, characterized in that, When the nut and the valve body connection part are threadedly connected through the thread pair, the end surface of the flared section abuts against the end surface of the large-diameter part of the sealing ring to form the second sealing structure.

8. The pipeline connection structure according to claim 7, characterized in that, The end of the valve body connection part has an outer conical surface, and one end of the washer facing the valve body connection part has an inner conical surface adapted to the outer conical surface; when the nut and the valve body connection part are threadedly connected through the thread pair, the outer end surface of the valve body connection part abuts against the end surface of the small-diameter part to form the first sealing structure.

9. The pipeline connection structure according to claim 7, wherein, The end of the valve body connection part has an outer conical surface, and one end of the washer facing the valve body connection part has an inner conical surface adapted to the outer conical surface; the end of the valve body connection part extends into the small-diameter part, and the inner hole wall surface of the small-diameter part abuts against the outer conical surface to form the first sealing structure.

10. The pipeline connection structure according to any one of claims 2-6, characterized in that, The small-diameter part is in interference fit with the washer, and the large-diameter part of the sealing ring is in clearance fit with the bushing.

11. The pipeline connection structure according to any one of claims 1-6, characterized in that, The sealing ring is a sealing ring made of plastic material or rubber material.

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