KR102425764B1 - Metal Gasket - Google Patents

Abstract

In the present invention, tubes are located on both sides of the inner space of the metal jacket, and a core in which a filler material and a winding material are alternately formed in the lateral direction along between the tubes is located, and the winding material is overlapped in plurality to determine the ratio of the winding material to the filler material. It provides a metal gasket, characterized in that raised.

Description

Metal Gasket

The present invention relates to a metal gasket, and more specifically, to a metal gasket having good durability by improving the internal structure of the metal gasket to minimize the compression amount and maintain restoring force.

In the case of a metal gasket used in a heat exchanger, it is easily compressed depending on the fastening conditions, and there is a problem that the normal sealing performance cannot be exhibited in a line with a rapid thermal change or a high temperature line.

In particular, in order to cover the surface roughness of the inappropriate facing part when the fastening flange part is aging, a product capable of withstanding higher strength than the existing metal gasket is needed in a line prone to overload.

Looking at the prior art, Korean Utility Model Registration No. 20-0196868 "Metal Gasket" has a sealing part (corresponding to the 'core' of the present invention) fixed by winding a mild steel plate and graphite tape crosswise as a support pipe to prevent deformation on both sides. Although configured, the elastic restoring force of the support tube is insufficient, and in order to improve the above technology, Korean Patent Registration No. 10-1184927 "Metal Gasket" has a spring placed inside the tube tube, which is a support tube, to prevent deformation of the tube tube. However, when the tube tube is deformed by a high load, it has been difficult to expect the restoration performance of the spring located inside it.

US 10-1184927 B1 "metal gasket" US 20-0196868 B1 "metal gasket"

In order to solve the above problems, an object of the present invention is to provide a metal gasket capable of minimizing compression and maintaining restoring force when a load is applied to the metal gasket.

In order to solve the above problems, in the present invention, tubes are located on both sides of the inner space of the metal jacket, and a core in which a filler material and a winding material are alternately formed in the lateral direction along between the tubes is located, and the winding material is overlapped in plurality to provide a metal gasket characterized in that the ratio of the winding material to the filler material is increased.

The winding material is a metal material, and the filler material is one of graphite, PTFE, ceramic, and inorganic materials.

The winding material is characterized in that it is wound 3 to 7 times.

The thickness of the winding material is 0.18 mm to 0.20 mm, and the thickness of the filler material is 0.5 mm to 1.0 mm.

The filler material and the winding material are characterized in that the central portion is bent to have a 'V'-shaped cross-sectional shape.

The metal jacket, characterized in that the upper and lower layers are further formed.

According to the above solution, the following effects can be expected.

It is possible to provide a metal gasket that can prevent deformation and maintain restoring force by adopting a single tube instead of a tube and a spring double structure for the metal gasket, but increasing the ratio of the winding material to the filler material in the internal structure of the core to reduce the compression amount.

Here, the cost can be reduced by simplifying the number of parts with one tube without using a spring in the spring tube double structure compared to the existing one.

1 is a cut-away perspective view of a metal gasket according to an embodiment of the present invention;
2 is a cross-sectional view of a metal gasket according to an embodiment of the present invention.
3 is a detailed structural view of the core of the metal gasket according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the following description and the accompanying drawings are presented for a general understanding of the present invention, the technical scope of the present invention is not limited thereto. In addition, detailed descriptions of well-known configurations and functions that may unnecessarily obscure the gist of the present invention will be omitted.

1 is a cut-away perspective view of a metal gasket according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a metal gasket according to an embodiment of the present invention.

1, the basic configuration of the metal gasket of the present invention is that the tube 200 is located on both sides of the inner space of the metal jacket 100 in the form of a tube, and the filler material and the winding material are mutually in the lateral direction along between the tubes 200. The alternately formed cores 300 are positioned. In addition, the upper and lower surfaces of the metal jacket 100 may be reinforced with a layer 400 to minimize deformation.

In the present invention, the tube 200 is positioned on both sides, and a plurality of the winding materials 340 are overlapped in the core 300 to increase the ratio of the winding material 340 to the filler material 320 .

In the method of overlapping a plurality of the winding material 340, it is possible to maintain stable elasticity with a strong fastening force by maximizing the elastic force of the winding material by multiple winding.

Here, the winding material 340 is a metal material, and the filler material 320 is flexible graphite. The thickness of the winding material 340 is 0.18 mm to 0.20 mm, and the thickness of the filler material is 0.5 mm to 1.0 mm.

Meanwhile, the filler material 320 and the winding material 340 have a 'V'-shaped cross-sectional shape by bending the central portion, thereby increasing the elastic effect.

Since the winding material 340 is wound 3 to 7 times, it is possible to exert a restoring force while reducing the amount of compression.

In Table 1 below, the amount of compression and restoration according to the turns ratio of the filler material 320 and the winding material 340 are shown as experimental results.

The test conditions are as follows.

- Specimen: JIC 3804-SF (304 Winding material + Flexible Graphite Filler)

- Test Goal: Comparison of the improvement effect of compression / restoration according to the increase in the number of windings of the winding material

- Dimensions: ID 178.4, OD 208.6

- Testing machine: 150Ton hydraulic press

- Test load: 54,825 kgf (based on bolt stress 50000 psi)

And the test procedure was carried out in the following order.

a. Place the specimen on the hydraulic press.

b. Place the lead coal at 4 points orthogonal to the outside of the test piece (the thickness of the lead coal is replaced by the thickness during compression).

c. Apply the test load and hold for 10 minutes.

d. Remove the test load, and check the thickness of the lead coal at each point and the thickness of the specimen after the test.

The result table according to the above test results is shown in Table 1, and the results of compression amount and restoration amount were obtained.

Psalter number of winding materials filler material
Kwon Soo pre-exam
Thickness (mm) when compressed
Thickness (mm) after the test
Thickness (mm) compression amount
(thickness before test-thickness when compressed) restoration amount
(Thickness after test - thickness at compression) Comparative Example (ASME B16.20
standard) One One 4.83 3.31 3.56 1.52 0.25 Experimental Example 1 3 One 4.49 3.11 3.36 1.38 0.25 Experimental Example 2 5 One 4.55 3.42 3.68 1.13 0.26 Experimental Example 3 7 One 4.59 3.65 3.77 0.94 0.12

When the number of turns of the winding material increases, the compression amount based on the same body load is reduced, which has the effect of increasing the bearing capacity for the load, but the restoration characteristics are relatively reduced, so it is necessary to select an appropriate ratio. As in the present invention, it was confirmed that the compression amount decreased as a result of increasing the ratio of the number of turns of the winding material to the number of turns of the filler material by 3 and 7 times (Experimental Examples 1 to 3), and it was confirmed to the extent that the amount of restoration can be exhibited.

Here, the increase in the number of turns of the winding material causes an increase in the weight of the gasket and an increase in the unit price as the metal position rises. It has been proven through experimental results that it is the best ratio in which the amount of compression is reduced and the amount of restoration is improved compared to the standard).

In Tables 2 and 3 below, the turns ratio of the winding material 340 compared to the filler material 320 is equal to 5 times, and the amount of compression and restoration according to the addition to the tube are shown as experimental results.

The test conditions were the same as before, and Table 2: Tests were conducted based on Bolt Stress 50,000 psi.

Psalter winding ratio backup ring pre-exam
thickness
(mm) when compressed
thickness
(mm) after the test
thickness
(mm) compression amount
(thickness before test-thickness when compressed) restoration amount
(Thickness after test - thickness at compression) Comparative Example 1 5 0.5t metal tube O-ring +1.0t core spring 6.91 6.03 6.19 0.88 0.16 Experimental Example 1 5 0.8t spring 6.89 5.17 5.54 1.72 0.37 Experimental Example 2 5 1.0t spring 6.93 5.51 6.02 1.42 0.51 Experimental Example 3 5 0.5t metal tube 6.55 5.42 5.67 1.13 0.25

The test conditions were the same as before, and Table 3 shows: The test was performed based on the bolt stress of 100,000 psi.

Psalter winding ratio backup ring pre-exam
thickness
(mm) when compressed
thickness
(mm) after the test
thickness
(mm) compression amount
(thickness before test-thickness when compressed) restoration amount
(Thickness after test - thickness at compression) Comparative Example 1 5 0.5t metal tube O-ring +1.0t core spring 6.94 5.87 5.91 1.07 0.04 Experimental Example 1 5 0.8t spring 6.93 4.75 5.23 2.18 0.48 Experimental Example 2 5 1.0t spring 7.00 4.93 5.54 2.07 0.61 Experimental Example 3 5 0.5t metal tube 6.56 4.85 5.16 1.71 0.31

In Comparative Example 1 (a product with a core spring inserted into the inner diameter of the metal tube O-ring), there was no significant abnormality at the bolt stress level of 50,000 psi, which is a general fastening environment. It was confirmed that the performance was destroyed.

In the case of the spring-inserted product presented in the present invention, it was confirmed that the 0.8 t wire rod had high restoration performance, and in particular, it was confirmed that the highest restoration performance could be exhibited when the spring of the 1.0 t wire rod was used.

And, in the case of Experimental Example 3, which is a product in which a metal tube is inserted, the amount of compression is lower than that of the spring type, so the internal bearing capacity is high, but the amount of restoration is higher than that of Comparative Example 1.

As described above, it can be seen that the present invention is based on the basic technical idea of a metal gasket, and within the scope of the basic idea of the present invention, many other modifications are possible for those of ordinary skill in the art. Of course.

100: metal jacket
200: tube
300: core
320: filler material
340: winding material
400: layer

Claims (6)

Tubes are located on both sides of the inner space of the metal jacket, and a core in which a filler material and a winding material are alternately formed in the lateral direction along between the tubes is located, and the winding material is overlapped in plurality to increase the ratio of the winding material to the filler material,
The winding material is wound 3 to 7 times so that the ratio of the number of turns of the winding material to the number of turns of the filler material is 3 to 7 times. According to claim 1,
The winding material is a metal material, and the filler material is a metal gasket, characterized in that one of graphite, PTFE, ceramic, and an inorganic material. delete According to claim 1,
The thickness of the winding material is 0.18 mm to 0.20 mm, the metal gasket, characterized in that the thickness of the filler material is 0.5 mm to 1.0 mm. According to claim 1,
The filler material and the winding material is a metal gasket, characterized in that the central portion is bent to have a 'V'-shaped cross-sectional shape. According to claim 1,
In the metal jacket,
Metal gasket, characterized in that the upper and lower layers are further formed.

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