Manufacturing method for rectangular can profile gaskets

Abstract

This invention provides a method for manufacturing rectangular can profile gaskets. [Solution] A method for manufacturing a rectangular can profile gasket used in an air-cooled heat exchanger includes the steps of: preparing a plurality of can profile gasket base materials (step S1); welding the plurality of can profile gasket base materials to form a ring-shaped rectangular body (step S2); forming a plurality of continuous grooves on both sides of the rectangular body (step S3); and attaching a sealing layer to both sides of the rectangular body with the plurality of grooves (step S4).

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a rectangular cam profile gasket.

Background Art

[0002] Gaskets for sandwiching connection points such as pipes to prevent leakage of liquids and gases are known. Also known as one type of gasket is an annular cam profile gasket in which soft seal layers are attached to both sides of a metal plate having a plurality of sawtooth-shaped grooves formed concentrically.

[0003] As one such cam profile gasket, Patent Document 1 discloses an invention of a cam profile gasket capable of ensuring sufficient sealing performance even when tightened so that the surface pressure becomes 80 MPa or more when arranged between flanges of a pipe by devising the pitch, depth and shape of the sawtooth-shaped grooves and the shape of the sawteeth (protrusions).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, in the crude oil component separation process, an air-cooled heat exchanger (air fin cooler) is used for cooling petroleum gas fractions, naphtha fractions, etc. As this air-cooled heat exchanger, a rectangular one is known, and a rectangular gasket is used for the internal connection part. As this rectangular gasket, instead of the conventionally used asbestos joint sheet, a non-asbestos joint sheet formed by mixing a rubber binder with non-asbestos fibers is used, but leakage may occur at high-temperature locations.

[0006] Therefore, while it might be conceivable to use a can-profile gasket, which offers superior sealing performance, as a gasket for a rectangular air-cooled heat exchanger, rectangular can-profile gaskets cannot be manufactured in the same way as annular can-profile gaskets. In other words, annular can-profile gaskets are machined on a lathe to form multiple sawtooth-shaped grooves concentrically, but this machining method is not possible for rectangular gaskets, requiring the development of a new manufacturing method.

[0007] The present invention has been made in view of the above-mentioned problems, and aims to provide a method for manufacturing a rectangular can profile gasket used in air-cooled heat exchangers. [Means for solving the problem]

[0008] The present invention provides a method for manufacturing a rectangular can profile gasket used in an air-cooled heat exchanger. The process involves preparing multiple base materials for can profile gaskets, A process of welding multiple base materials for can profile gaskets to form a ring-shaped rectangular body, The process involves forming a plurality of continuous grooves on both sides of the rectangular body, A step of applying a sealing layer to both sides of the rectangular body having the plurality of grooves formed thereon, It is characterized by including.

[0009] In the above method for manufacturing a rectangular can profile gasket, In the step of preparing multiple base materials for the can profile gasket, multiple base materials for the can profile gasket are prepared, each having multiple sawtooth-shaped grooves formed on both sides. In the step of forming the plurality of grooves, the plurality of grooves may be formed such that each of the plurality of grooves formed in each of the plurality of can profile gasket base materials is continuous in the circumferential direction.

[0010] In the above method for manufacturing a rectangular can profile gasket, In the step of preparing multiple base materials for the can profile gasket, multiple linear base materials for the can profile gasket may be prepared.

[0011] In the above method for manufacturing a rectangular can profile gasket, In the step of preparing multiple base materials for the can profile gasket, in order to perform welding on the straight portion of the rectangular body, four can profile gasket base materials constituting the corners of the rectangular body and multiple straight can profile gasket base materials may be prepared. [Effects of the Invention]

[0012] According to the method for manufacturing a rectangular can profile gasket of the present invention, a rectangular can profile gasket can be manufactured by welding together a plurality of prepared can profile gasket base materials to form a ring-shaped rectangular body, forming a plurality of continuous grooves on both sides of the formed rectangular body, and then applying a sealing layer to both sides of the rectangular body. In particular, since a plurality of continuous grooves are formed on both sides of the rectangular body, a rectangular can profile gasket with high sealing performance can be manufactured. [Brief explanation of the drawing]

[0013] [Figure 1] This figure shows an example of a rectangular can profile gasket manufactured by the method for manufacturing a rectangular can profile gasket according to the present invention, where (a) is a plan view and (b) is an enlarged cross-sectional view when cut along the IB-IB line in (a). [Figure 2] This is a flowchart illustrating the manufacturing method of a rectangular can profile gasket in the first embodiment. [Figure 3] This is a plan view showing four linear base materials for can profile gaskets. [Figure 4] This is a plan view showing the formed ring-shaped rectangle. [Figure 5] It is a plan view showing a base material for a cam profile gasket that constitutes a corner of a rectangular body. [Figure 6] It is a plan view showing a ring-shaped rectangular body formed using four base materials for cam profile gaskets and four linear base materials for cam profile gaskets.

Embodiments for Carrying Out the Invention

[0014] FIG. 1 is a view showing an example of a rectangular cam profile gasket 10 manufactured by the method for manufacturing a rectangular cam profile gasket according to the present invention. (a) is a plan view, and (b) is an enlarged cross-sectional view when cut along the line IB-IB of (a). The internal structure, more specifically, the surface structure of the gasket core portion 1 described later, is shown within the enlarged circle in FIG. 1(a).

[0015] The rectangular cam profile gasket 10 includes a ring-shaped rectangular gasket core portion 1 and seal layers 2 attached to both surfaces of the gasket core portion 1. The size of the rectangular cam profile gasket 10 is adapted to the size of the square air-cooled heat exchanger to be arranged. For example, the length of the long side is 500 mm to 3000 mm, and the length of the short side is 100 mm to 1000 mm.

[0016] The gasket core portion 1 is made of a metal such as stainless steel, iron, or aluminum. However, the type of metal constituting the gasket core portion 1 is not limited to those described above. The gasket core portion 1 has a rectangular ring shape. As shown in FIG. 1(a), the corner portions at the four corners of the gasket core portion 1 can be manufactured in a specified shape. In the present invention, the "rectangle" includes not only those with right-angled corners at the four corners but also those with rounded corners and those with a generally rectangular shape as a whole. The thickness of the gasket core portion 1 is, for example, 3 mm to 7 mm.

[0017] As shown in Fig. 1(b), a plurality of saw-tooth-shaped grooves 3 are formed on both sides of the gasket core portion 1. The depth of the groove 3 is, for example, 0.25 mm to 0.60 mm. Also, the pitch of adjacent grooves 3 is, for example, 1.0 mm to 2.0 mm. The angle of the groove 3 is, for example, 90°. However, these numerical values are merely examples, and the present invention is not limited by these numerical values.

[0018] The seal layer 2 is made of a soft material, for example, an expanded graphite sheet, a PTFE (polytetrafluoroethylene) sheet, a rubber sheet, a clay sheet, a graphite-clay composite sheet, etc. However, the seal layer 2 is not limited to the above-mentioned sheets. The thickness of the seal layer 2 is, for example, 0.2 mm to 1.0 mm. The seal layer 2 is attached to both sides of the gasket core portion 1 by any bonding means such as an adhesive or a double-sided tape.

[0019] The rectangular profile gasket 10 is used for a square air-cooled heat exchanger. When a tightening surface pressure is applied to the rectangular profile gasket 10 during connection using the rectangular profile gasket 10, the seal layer 2 deformed by tightening enters the groove 3 of the gasket core portion 1. As a result, excessive deformation of the seal layer 2 is less likely to occur, so a high repulsive force against the tightening surface pressure is generated from the seal layer 2, and as a result, excellent sealing performance is exhibited even at a low tightening surface pressure. Also, since excessive deformation of the seal layer 2 is less likely to occur, unevenness in the tightening force is less likely to occur depending on the part during tightening. Therefore, even an unskilled person can easily perform uniform tightening, and good sealing performance can be exhibited.

[0020] (Manufacturing method) The following describes a method for manufacturing a rectangular can profile gasket according to the present invention. The method for manufacturing a rectangular can profile gasket according to the present invention includes the steps of: preparing a plurality of can profile gasket base materials; welding the plurality of can profile gasket base materials to form a ring-shaped rectangular body; forming a plurality of continuous grooves on both sides of the rectangular body; and attaching a sealing layer to both sides of the rectangular body on which the plurality of grooves have been formed.

[0021] <First Embodiment> Figure 2 is a flowchart illustrating the manufacturing method of a rectangular can-profile gasket in the first embodiment. In step S1, multiple can-profile gasket substrates are prepared. The can-profile gasket substrates are substrates for constituting the gasket core portion 1, and multiple sawtooth-shaped grooves are formed on both sides thereof. The can-profile gasket substrates are made of metal such as stainless steel, iron, or aluminum, and can be manufactured, for example, by CNC machining.

[0022] In this embodiment, multiple linear can-profile gasket substrates are prepared. For example, four can-profile gasket substrates are prepared. Figure 3 is a plan view showing the four prepared linear can-profile gasket substrates 11. Multiple linear grooves 3 are formed on the linear can-profile gasket substrates 11. In conventional annular can-profile gaskets, multiple concentric grooves are formed while the workpiece is rotated on a lathe, but multiple linear grooves 3 can be formed by moving the workpiece in a linear direction.

[0023] In step S2, following step S1, the multiple can profile gasket base materials 11 prepared in step S1 are welded together to form a ring-shaped rectangular body. If four can profile gasket base materials 11 are prepared, the ends of each can profile gasket base material 11 are welded together to form a ring-shaped rectangular body.

[0024] When forming a ring-shaped rectangular body, it is preferable to process the corners so that they have a desired radius. By rounding the corners to have a desired radius rather than making them right angles, stress concentration at the corners during tightening with a rectangular can profile gasket can be alleviated, and uniform surface pressure can be obtained.

[0025] Figure 4 is a plan view showing a ring-shaped rectangular body 20 formed by welding linear can profile gasket base materials 11. Figure 4 also shows the welding points Y1 to Y4 when welding four can profile gasket base materials 11. Note that grooves are omitted in Figure 4. It is also possible to prepare and weld more than four can profile gasket base materials 11. For example, when preparing and welding eight can profile gasket base materials, the welding points would be, for example, Y1 to Y8 as shown in Figure 4.

[0026] In step S3, following step S2, multiple continuous grooves 3 are formed on both sides of the rectangular body 20. That is, in the rectangular body 20 formed by welding multiple can profile gasket base materials 11, the grooves 3 are discontinuous at least at the weld locations. Therefore, multiple grooves 3 are formed such that each of the multiple grooves 3 formed on each of the multiple can profile gasket base materials 11 is continuous in the circumferential direction. Here, the multiple grooves 3 are formed manually by an operator. However, a machine may be used to form the multiple continuous grooves 3 instead of manually. The rectangular body 20 with multiple circumferentially continuous grooves 3 formed becomes the gasket core portion 1 of the rectangular can profile gasket 10.

[0027] In step S4, following step S3, the sealing layer 2 is attached to both sides of the rectangular body 20, i.e., the gasket core portion 1, which has multiple grooves 3 formed on it. The sealing layer 2 can be attached using any adhesive means, such as adhesive or double-sided tape. By attaching the sealing layer 2 to both sides of the gasket core portion 1, a rectangular can profile gasket 10 is obtained.

[0028] According to the manufacturing method for the rectangular can profile gasket in the first embodiment, a rectangular can profile gasket 10 can be manufactured by welding a plurality of prepared can profile gasket base materials 11 to form a ring-shaped rectangular body 20, forming a plurality of continuous grooves 3 on both sides of the rectangular body 20, and then attaching a seal layer 2 to both sides of the rectangular body 20. In particular, since a plurality of continuous grooves 3 are formed on both sides of the rectangular body 20, a rectangular can profile gasket 10 with high sealing performance can be manufactured. That is, in a configuration in which a plurality of can profile gasket base materials 11 with a plurality of grooves 3 are welded to form a ring-shaped rectangular body 20 and a seal layer is attached to both sides thereof, there are places in the circumferential direction where the grooves 3 are interrupted, and the sealing performance deteriorates at those places. However, by forming continuous grooves 3 in the circumferential direction, a rectangular can profile gasket 10 with high sealing performance can be manufactured.

[0029] Furthermore, in the process of preparing multiple base materials 11 for can profile gaskets, multiple base materials 11 for can profile gaskets are prepared, each having multiple sawtooth-shaped grooves 3 formed on both sides. In the process of forming the multiple grooves 3, the multiple grooves 3 are formed such that each of the multiple grooves 3 formed on each of the multiple base materials 11 for can profile gaskets is continuous in the circumferential direction. This ensures that multiple circumferentially continuous grooves 3 are reliably formed, enabling the manufacture of a highly sealing rectangular can profile gasket 10.

[0030] Furthermore, in this embodiment, since multiple linear can profile gasket base materials 11 are prepared, base materials for welding can be easily prepared.

[0031] <Second Embodiment> The method for manufacturing the rectangular can profile gasket in the second embodiment differs from the method for manufacturing the rectangular can profile gasket in the first embodiment in steps S1 and S2 of the flowchart shown in Figure 2. Therefore, the following description will focus on steps S1 and S2.

[0032] In step S1 of Figure 2, in order to perform welding on the straight portion of the ring-shaped rectangular body 20 in the subsequent welding process (step S2), four can-profile gasket base materials that constitute the corners of the rectangular body 20 and multiple straight can-profile gasket base materials are prepared. The four can-profile gasket base materials that constitute the corners of the rectangular body 20 and the straight can-profile gasket base materials are base materials for forming the gasket core portion 1, and multiple sawtooth-shaped grooves 3 are formed on both sides thereof. These can-profile gasket base materials are made of metal such as stainless steel, iron, or aluminum, and can be manufactured, for example, by CNC machining.

[0033] Figure 5 is a plan view showing the base material 30 for the can profile gasket that constitutes the corner of the rectangular body 20. As shown in Figure 5, the base material 30 for the can profile gasket that constitutes the corner of the rectangular body 20 has a shape in which a first straight section 31 and a second straight section 32, which are in an orthogonal positional relationship, are connected at their ends. In the example shown in Figure 5, the lengths of the first straight section 31 and the second straight section 32 are the same, but they may be different. As shown in Figure 5, it is preferable that the corners of the base material 30 for the can profile gasket are not right angles but are rounded. By having rounded corners instead of right angles, stress concentration at the corners when tightening with a rectangular can profile gasket can be alleviated, and uniform surface pressure can be obtained.

[0034] Multiple continuous sawtooth-shaped grooves 3 are formed on both sides of the base material 30 for the can profile gasket. Specifically, multiple linear grooves 3 are formed in the first linear section 31 and the second linear section 32, and each groove 3 is formed to be continuous from the first linear section 31 to the second linear section 32. In this case as well, the linear portions of the grooves 3 can be formed by moving the workpiece linearly, and the corner portions connecting the linear portions can be formed manually.

[0035] In step S2, following step S1, multiple can profile gasket base materials prepared in step S1 are welded together to form a ring-shaped rectangular body. In this embodiment, the ring-shaped rectangular body is formed by welding the can profile gasket base material 30 that constitutes the corner of the rectangular body 20 to the straight can profile gasket base material 35.

[0036] Figure 6 is a plan view showing a ring-shaped rectangular body 20 formed using four can-profile gasket base materials 30 and four linear can-profile gasket base materials 35. Figure 6 also shows the welding points Y11 to Y18 of the ring-shaped rectangular body 20. Note that grooves are omitted in Figure 6.

[0037] Steps S3 and S4 are the same as those for manufacturing a rectangular can profile gasket in the first embodiment.

[0038] In the method for manufacturing a rectangular can profile gasket according to the second embodiment, since four can profile gasket base materials constituting the corners of the rectangular body 20 and multiple straight can profile gasket base materials are prepared and welded, welding can be performed on the straight portions of the rectangular body to be formed. This makes the welding process easier compared to when welding is performed on the corners of the rectangular body.

[0039] The present invention is not limited to the embodiments described above, and various applications and modifications can be made within the scope of the present invention. [Explanation of Symbols]

[0040] 1. Gasket core section 2 sealing layers 3 grooves 10 Rectangular Can Profile Gaskets 11 Linear Can Profile Gasket Base Material 20 rectangular body 30 Base material for can profile gaskets that form the corners of a rectangular body 35 Linear Can Profile Gasket Substrate

Claims

1. A method for manufacturing a rectangular can profile gasket used in an air-cooled heat exchanger, The process involves preparing multiple base materials for can profile gaskets, A process of welding multiple base materials for can profile gaskets to form a ring-shaped rectangular body, The process involves forming a plurality of continuous grooves on both sides of the rectangular body, A step of applying a sealing layer to both sides of the rectangular body having the plurality of grooves formed thereon, A method for manufacturing a rectangular can profile gasket, characterized by including the following:

2. In the step of preparing multiple base materials for the can profile gasket, multiple base materials for the can profile gasket are prepared, each having multiple sawtooth-shaped grooves formed on both sides. The method for manufacturing a rectangular can profile gasket according to claim 1, characterized in that, in the step of forming the plurality of grooves, the plurality of grooves formed in each of the plurality of can profile gasket base materials are formed in such a way that each of the plurality of grooves is continuous in the circumferential direction.

3. The method for manufacturing a rectangular can profile gasket according to claim 1 or 2, characterized in that, in the step of preparing a plurality of can profile gasket base materials, a plurality of linear can profile gasket base materials are prepared.

4. The method for manufacturing a rectangular can profile gasket according to claim 1 or 2, characterized in that, in the step of preparing multiple can profile gasket base materials, four can profile gasket base materials constituting the corners of the rectangular body and multiple linear can profile gasket base materials are prepared in order to perform welding on the straight portion of the rectangular body.

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