Pipeline connection structure and EVA production device using the same

Abstract

The present invention provides a connection structure for connecting a high-pressure pipeline and a low-pressure pipeline, comprising: a low-pressure side connector connected to the low-pressure pipeline and a high-pressure side connector connected to the low-pressure side connector. The high-pressure pipeline passes through the high-pressure side connector and the low-pressure side connector. A chamber is formed between the low-pressure side connector, the high-pressure pipeline and the high-pressure side connector, and a filler is contained in the chamber. The connection structure provided by the present invention realizes a welding-free sealed connection between the high-pressure pipeline and the low-pressure pipeline. This connection structure can withstand a large impact force without causing damage to the connector and the low-pressure pipeline, thereby enhancing the service life of the connector and the low-pressure pipeline. In addition, the connection structure provided by the present invention is simple in structure, easy to install, easy to maintain, and has a low investment cost. In addition, the present invention also provides an EVA production device using the above-mentioned connection structure.

Description

Technical Field

[0001] The invention relates to the field of EVA production devices, and in particular to a connection structure for connecting a high-pressure pipeline and a low-pressure pipeline and an EVA production device using the connection structure. Background Art

[0002] In the high-pressure circulating gas unit of the EVA production device, there are several high-pressure pipeline bursting discs with a bursting pressure of 37.8MPaG. It is required that their outlets be connected to the low-pressure exhaust pipe and led to a safe place. The top of the low-pressure exhaust pipe should be more than 3.5 meters higher than the highest point within a 20-meter radius of the low-pressure exhaust pipe (i.e., with the low-pressure exhaust pipe as the center and a radius of 20m). When the high-pressure bursting disc explodes, the instantaneous pressure on the pipe wall of the high-pressure bursting disc outlet pipe is very large, thereby generating a strong impact force on the low-pressure exhaust pipe. If a fixed method (such as welding or using a fixed clamp) is used to connect the high-pressure bursting disc outlet pipe and the low-pressure exhaust pipe, the cylinder body of the low-pressure exhaust pipe is easily damaged.

[0003] In view of the above problems, the prior art usually solves them by installing a metal bellows expansion joint between the high-pressure bursting disc outlet pipe and the low-pressure exhaust pipe. However, this method has the following disadvantages: complex structure, great manufacturing difficulty, difficult construction, high investment, and the selection of the metal bellows expansion joint is also a major difficulty.

[0004] Based on this, the existing technology still needs to be improved. Summary of the invention

[0005] In order to solve the problem of safe connection between the high-pressure bursting disc outlet pipe and the low-pressure exhaust pipe and ensure that the impact force generated when the bursting disc explodes will not cause damage to the connecting parts, the present invention provides a connecting structure for connecting the high-pressure pipeline and the low-pressure pipeline and an EVA production device using this connecting structure.

[0006] Based on the above purpose, the following technical solutions are adopted:

[0007] In one aspect, the present invention provides a connection structure for connecting a high-pressure pipeline and a low-pressure pipeline, the connection structure comprising: a low-pressure side connection piece connected to the low-pressure pipeline; a high-pressure side connection piece connected to the low-pressure side connection piece;

[0008] Wherein, the high-pressure pipeline passes through the high-pressure side connector and the low-pressure side connector,

[0009] A chamber is formed between the inner side of the low-pressure side connector, the outer side of the high-pressure pipeline and the end face of the high-pressure side connector close to the low-pressure side connector, and filler is contained in the chamber.

[0010] According to one embodiment, the high-pressure side connecting piece and the low-pressure side connecting piece are both flanges.

[0011] According to one embodiment, the high-pressure side connector is a blind flange with a hole, the diameter of the hole is larger than the outer diameter of the high-pressure pipe, and the low-pressure side connector is a standard flange, the inner diameter of the opening of which is larger than the outer diameter of the high-pressure pipe and larger than the diameter of the hole of the high-pressure side connector.

[0012] According to one embodiment, the low-pressure side connector is connected to the low-pressure pipeline by welding, and the high-pressure side connector is connected to the low-pressure side connector by fasteners.

[0013] According to one embodiment, the fastener is a stud and a nut that fit together or a bolt and a nut that fit together.

[0014] According to one embodiment, the high-pressure side connector and the low-pressure side connector each include a body and a connecting portion protruding radially outward relative to the body, and the connection between the high-pressure side connector and the low-pressure side connector is achieved through the connecting portion.

[0015] According to one embodiment, a gasket is provided between the high-pressure side connector and the low-pressure side connector.

[0016] According to one embodiment, the high-pressure pipeline is a high-pressure bursting disc outlet pipeline of a high-pressure circulating gas unit of an EVA production device, and the low-pressure pipeline is a low-pressure exhaust pipe.

[0017] According to one embodiment, a load-bearing lug is provided on the low-pressure pipeline.

[0018] On the other hand, the present invention provides an EVA production device, wherein the high-pressure circulating gas unit of the EVA production device has a high-pressure bursting disc outlet pipe, and the high-pressure bursting disc outlet pipe is connected to the low-pressure exhaust pipe through a connecting structure, wherein the connecting structure includes:

[0019] A low-pressure side connector connected to the low-pressure exhaust pipe; and

[0020] A high-pressure side connector connected to the low-pressure side connector;

[0021] Wherein, the high-pressure bursting disc outlet pipe passes through the high-pressure side connector and the low-pressure side connector,

[0022] A chamber is formed between the inner side of the low-pressure side connector, the outer side of the high-pressure bursting disc outlet pipe and the end face of the high-pressure side connector close to the low-pressure side connector, and filler is contained in the chamber.

[0023] By adopting the above technical solution, the present invention can achieve the following beneficial effects:

[0024] 1. The connection structure realizes a weld-free sealed connection between the high-pressure pipeline and the low-pressure pipeline. This connection can withstand a large impact force without damaging the connector and the low-pressure pipeline, thereby increasing the service life of the connector and the low-pressure pipeline. In addition, the connection structure provided by the present invention is simple in structure, easy to install, easy to maintain, and has a low investment cost.

[0025] 2. The EVA production device provided by the present invention has a welding-free sealed connection structure, so the connection safety is improved, and it can be ensured that the instantaneous impact force when the bursting piece explodes will not impact the low-pressure exhaust pipe or the intermediate connecting piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some implementation cases of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of a connection structure for connecting a high-pressure pipeline and a low-pressure pipeline provided in one embodiment of the present invention.

[0028] Reference numerals list

[0029] 1- low-pressure pipeline; 2- low-pressure side connector; 3- high-pressure side connector; 4- high-pressure pipeline; 5- packing; 6- fastener; 7- gasket; 8- load-bearing lug. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0031] A first aspect of the present invention provides a connection structure for connecting a high-pressure pipeline and a low-pressure pipeline, such as Figure 1 As shown, the connection structure includes: a low-pressure side connector 2 connected to a low-pressure pipeline 1; and a high-pressure side connector 3 connected to the low-pressure side connector 2. The high-pressure pipeline 4 passes through the high-pressure side connector 3 and the low-pressure side connector 2. A chamber for accommodating a filler 5 is formed between the inner side of the low-pressure side connector 2, the outer side of the high-pressure pipeline 4, and the end face of the high-pressure side connector 3 close to the low-pressure side connector 2.

[0032] In the technical solution shown in the accompanying drawings, the high-pressure side connector 3 and the low-pressure side connector 2 are both flanges. Among them, the high-pressure side connector 3 is a blind flange with a hole, and the diameter of the hole is slightly larger than the outer diameter of the high-pressure pipeline 4, so as to ensure that the high-pressure pipeline 4 can be inserted through the hole of the high-pressure side connector 3. The low-pressure side connector 2 is a standard flange, and its opening inner diameter is larger than the outer diameter of the high-pressure pipeline 4 and larger than the diameter of the hole of the high-pressure side connector 3, so that a chamber for accommodating the filler 5 is formed between the inner side surface of the low-pressure side connector 2 (i.e., the inner wall of the opening), the outer side surface of the high-pressure pipeline 4, and the end surface of the high-pressure side connector 3 close to the low-pressure side connector 2.

[0033] In the above technical solution, the high-pressure side connector 3 includes a body and a connecting portion protruding radially outward relative to the body. The low-pressure side connector 2 includes a tubular body and a connecting portion protruding radially outward relative to the tubular body. The connecting portion of the high-pressure side connector 3 and the connecting portion of the low-pressure side connector 2 are provided with a plurality of connecting holes aligned with each other, thereby realizing the connection between the high-pressure side connector 3 and the low-pressure side connector 2 through the connecting holes on the connecting portions.

[0034] In the above technical solution, the low-pressure side connector 2 is welded to the low-pressure pipeline 1. The inner diameter of the opening of the low-pressure side connector 2 is substantially equal to the inner diameter of the low-pressure pipeline 1, so as to facilitate a firm connection between the two.

[0035] In the above technical solution, the high-pressure side connector 3 is connected to the low-pressure side connector 2 by a fastener 6. The number of fasteners 6 can be set according to actual needs, and the present invention does not specifically limit this. In the embodiment shown in the accompanying drawings, the fastener 6 is a stud and a nut that cooperate with each other. Among them, the stud is preferably a full-thread stud. Of course, the stud can also be a double-headed stud, and the present invention does not limit this. The nut is preferably a heavy nut to improve the strength and reliability of the connection. The stud passes through the connection hole on the connecting part of the high-pressure side connector 3 and the connection hole on the connecting part of the low-pressure side connector 2, and the connection between the high-pressure side connector 3 and the low-pressure side connector 2 is achieved by tightening two matching nuts at both ends. In other embodiments, the fastener 6 can also be a bolt and a nut that cooperate with each other.

[0036] In the above technical solution, a gasket 7 is arranged between the high-pressure side connector 3 and the low-pressure side connector 2 to prevent damage to the high-pressure side connector 3 and the low-pressure side connector 2 during the connection process, and also helps to increase the contact area, thereby increasing the friction.

[0037] In the above technical solution, the filler 5 is preferably a metal-wound flexible graphite filler, or a polytetrafluoroethylene filler. A sufficiently high filler can ensure the sealing between the low-pressure pipeline 1 and the high-pressure pipeline 4 to prevent medium leakage.

[0038] In a specific embodiment, the high-pressure pipeline 4 is the high-pressure bursting disc outlet pipeline of the high-pressure circulating gas unit of the EVA device, and the low-pressure pipeline 1 is a low-pressure exhaust pipe. Since there is no welding point or other fixed hard connection type between the high-pressure bursting disc outlet pipeline and the low-pressure exhaust pipe, the instantaneous impact force when the bursting disc explodes will not impact the low-pressure exhaust pipe or the intermediate connector, thereby enhancing the service life of the low-pressure exhaust pipe or the intermediate connector. In this case, the outer diameter of the low-pressure exhaust pipe is at least twice the outer diameter of the high-pressure bursting disc outlet pipeline. The material of the high-pressure pipeline 4 can be bidirectional stainless steel, and the material of the low-pressure pipeline 1 can be carbon steel. The low-pressure pipeline 1 and the low-pressure side connector 2 are preferably set to the same material to facilitate welding between the two. A load-bearing lug 8 can be set on the low-pressure pipeline 1 to support the load of the entire low-pressure pipeline structure. The position of the load-bearing lug 8 can be selected according to the height requirement of the exhaust pipe. The load-bearing ear 8 includes a support plate arranged around the outer side of the exhaust pipe and an ear arranged on the support plate and connected to the exhaust pipe. The number of ears can be set as needed. For example, two ears can be set symmetrically on both sides, or more ears evenly distributed in the circumferential direction can be set.

[0039] The following describes the installation process of the connection structure for connecting a high-pressure pipeline and a low-pressure pipeline provided by the present invention: first, the high-pressure side connector 3 is sleeved onto the high-pressure pipeline 4; then, the gasket 5, the low-pressure side connector 2, and the filler 5 are assembled in sequence; thereafter, the high-pressure side connector 3 and the low-pressure side connector 2 are fastened by the fastener 6; finally, the low-pressure pipeline 1 is welded to the low-pressure side connector 2, thereby realizing the connection between the high-pressure pipeline 4 and the low-pressure pipeline 1.

[0040] In summary, the connection structure provided by the present invention realizes a welding-free sealed connection between the high-pressure pipeline and the low-pressure pipeline. This connection can withstand a large impact force without damaging the connector and the low-pressure pipeline, thereby enhancing the service life of the connector and the low-pressure pipeline. In addition, the connection structure provided by the present invention is simple in structure, easy to install, easy to maintain, and has a low investment cost.

[0041] The second aspect of the present invention provides an EVA production device, wherein the high-pressure circulating gas unit of the EVA production device has a high-pressure bursting disc outlet pipe, which is connected to a low-pressure exhaust pipe through a connecting structure, wherein the connecting structure includes: a low-pressure side connecting piece connected to the low-pressure exhaust pipe; and a high-pressure side connecting piece connected to the low-pressure side connecting piece; wherein the high-pressure bursting disc outlet pipe passes through the high-pressure side connecting piece and the low-pressure side connecting piece, thereby forming a chamber for accommodating filler between the inner side surface of the low-pressure side connecting piece, the outer side surface of the high-pressure bursting disc outlet pipe, and the end surface of the high-pressure side connecting piece close to the low-pressure side connecting piece.

[0042] The EVA production device provided by the present invention has a welding-free sealed connection structure between the high-pressure bursting disc outlet pipe and the low-pressure exhaust pipe, so the connection safety is improved, and it can be ensured that the instantaneous impact force when the bursting disc explodes will not impact the low-pressure exhaust pipe or the intermediate connecting piece.

[0043] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A connection structure for connecting a high-pressure pipeline and a low-pressure pipeline, comprising: A low-pressure side connector connected to the low-pressure pipeline; A high-pressure side connector connected to the low-pressure side connector; Wherein, the high-pressure pipeline passes through the high-pressure side connector and the low-pressure side connector, The high-pressure side connector has a hole, the diameter of which is larger than the outer diameter of the high-pressure pipeline, so as to allow the high-pressure pipeline to be inserted through the hole of the high-pressure side connector; the low-pressure side connector has an opening, the inner diameter of which is larger than the outer diameter of the high-pressure pipeline and larger than the diameter of the hole of the high-pressure side connector but smaller than the outer diameter of the body of the high-pressure side connector; a chamber is formed between the inner side surface of the low-pressure side connector, the outer side surface of the high-pressure pipeline and the end surface of the high-pressure side connector close to the low-pressure side connector, and a filler is contained in the chamber. Wherein, a gasket is arranged between the high-pressure side connecting piece and the low-pressure side connecting piece.

2. The connection structure for connecting a high-pressure pipeline and a low-pressure pipeline according to claim 1, characterized in that: The high-pressure side connecting piece and the low-pressure side connecting piece are both flanges.

3. The connection structure for connecting a high-pressure pipeline and a low-pressure pipeline according to claim 2, characterized in that: The high-pressure side connecting piece is a blind flange with a hole, and the low-pressure side connecting piece is a standard flange.

4. The connection structure for connecting a high-pressure pipeline and a low-pressure pipeline according to claim 1, characterized in that: The low-pressure side connecting piece is connected to the low-pressure pipeline by welding, and the high-pressure side connecting piece is connected to the low-pressure side connecting piece by fasteners.

5. The connection structure for connecting a high-pressure pipeline and a low-pressure pipeline according to claim 4, characterized in that: The fasteners are studs and nuts that fit together or bolts and nuts that fit together.

6. The connection structure for connecting a high-pressure pipeline and a low-pressure pipeline according to claim 1, characterized in that: The high-pressure side connector and the low-pressure side connector each include a body and a connecting portion protruding radially outward relative to the body, and the connection between the high-pressure side connector and the low-pressure side connector is achieved through the connecting portion.

7. The connection structure for connecting a high-pressure pipeline and a low-pressure pipeline according to claim 1, characterized in that: The high-pressure pipeline is a high-pressure bursting disc outlet pipeline of a high-pressure circulating gas unit of an EVA production device, and the low-pressure pipeline is a low-pressure exhaust pipe.

8. The connection structure for connecting a high-pressure pipeline and a low-pressure pipeline according to claim 7, characterized in that: The low-pressure pipeline is provided with a load-bearing lug.

9. An EVA production device, wherein the high-pressure circulating gas unit of the EVA production device has a high-pressure bursting disc outlet pipe, and the high-pressure bursting disc outlet pipe is connected to the low-pressure exhaust pipe through a connecting structure, wherein: The connection structure comprises: A low-pressure side connector connected to the low-pressure exhaust pipe; and A high-pressure side connector connected to the low-pressure side connector; Wherein, the high-pressure bursting disc outlet pipe passes through the high-pressure side connector and the low-pressure side connector, The high-pressure side connector is provided with a hole, the diameter of which is larger than the outer diameter of the high-pressure bursting disc outlet pipe, so as to allow the high-pressure bursting disc outlet pipe to be inserted through the hole of the high-pressure side connector; the low-pressure side connector is provided with an opening, the inner diameter of which is larger than the outer diameter of the high-pressure bursting disc outlet pipe and larger than the diameter of the hole of the high-pressure side connector but smaller than the outer diameter of the body of the high-pressure side connector; a chamber is formed between the inner side surface of the low-pressure side connector, the outer side surface of the high-pressure bursting disc outlet pipe and the end surface of the high-pressure side connector close to the low-pressure side connector, and a filler is contained in the chamber, Wherein, a gasket is arranged between the high-pressure side connecting piece and the low-pressure side connecting piece.

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