JPH04134963U - gas seal device - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress thermal deformation of the rotating ring as much as possible. [Configuration] Fixed ring 22 and support ring 23 on rotating shaft 21
A shaft sealing surface is formed by a rotary ring 25 fixed with a nut 24 via a rotary ring 25 and a seal ring 27 attached to a casing 26 surrounding the rotary shaft 21, thereby sealing a high pressure chamber 28 and a low pressure chamber 2.
Seal between 9 and 9. A coating layer 33 of cemented carbide or the like is applied to the sliding surface of the rotating ring 25 facing the seal ring 27. Similarly, a coating layer 35 made of the same material as the coating on the sliding surface is also applied to the surface of the rotating ring 25 opposite to the sliding surface.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a gas system that is applied to shaft seal devices of high-pressure gas rotating machinery such as gas compressors. Regarding the tool equipment.

0002

[Conventional technology]

FIG. 4 shows an example of a conventional gas seal device. In Figure 4, high pressure chamber 1 and low pressure chamber 2, a nut is attached to the rotating shaft 3 through a fixing ring 4 and a protective ring 5. 6, a rotating ring 7 fixed to the casing 8, a seal casing 9, and a spring. 10 and the retainer 11, and is in close contact with the rotating ring 7 and the rotating shaft 3. and a seal ring 12 that faces each other through a small axial gap during rotation of the seal ring 12. The rotary ring 7 and the seal ring 12 form a shaft-sealing structure.

0003 In addition, the sliding surface of the rotating ring 7 facing the seal ring 12 is provided with a rotating ring due to rotation. Circumference from the outer circumference of the rotating ring 7 toward the inner circumference in the direction of involving the gas on the outer circumference of the rotating ring 7 A plurality of spiral grooves 13 with minute depths are provided in the direction.

0004 Generally, the seal ring 12 described above is made of carbon material, and the rotating ring 7 is made of a carbon material. Carbon material and cemented carbide or silicon carbide with good sliding properties are used. There is.

[0005] Furthermore, the outer circumference of the rotating ring 7 is designed to prevent dissipation due to breakage of the rotating ring 7. A protective ring 5 is shrink-fitted or elastically supported by the O-ring 4.

[0006] Figure 5 shows another example of a conventional gas seal device, which is almost the same as that shown in Figure 4. The structure is such that the rotating ring 7 has a base material on the sliding surface facing the seal ring 12. A coating layer 14 of cemented carbide is provided on the stainless steel material.

[0007] In this example, the breaking strength of the rotating ring 7 is sufficient, so unlike the example in FIG. , the protective ring 5 is not provided on the outer periphery of the rotating ring 7, and a support is used to fix the rotating ring 7 in the axial direction. A mochi ring 15 is used. In addition, the same parts as in Fig. 4 are given the same reference numerals, and the parts that overlap Explanation will be omitted.

[0008]

[Problem that the idea aims to solve]

However, the conventional rotating ring 7 shown in FIG. 4 is made of cemented carbide or silicon carbide. In the example used, the material is hard and may be damaged by impact, making it difficult to assemble and transport. There was a problem that required attention. It also has the characteristic of having low strength relative to its specific weight. Due to its nature, it was not suitable for high-speed rotation.

[0009] Therefore, a structure in which the sliding surface of the rotating ring 7 is coated with cemented carbide as shown in Fig. 5 has been proposed. In this example, the problem shown in the example of FIG. 4 does not occur.

0010 However, due to the difference in thermal expansion coefficient between cemented carbide and the base material stainless steel, Particularly, heat generation occurs on sliding surfaces where the seal ring 12 and rotating ring 7 contact and rotate. Under large conditions, the state shown in Fig. 6 changes due to the bimetallic effect shown in Fig. 7. The rotating ring 7 having the spiral groove 13 and the cemented carbide coating layer 14 is thermally deformed. Ru.

[0011] In this case, in this type of gas seal, the rotation ring 7 and the seal ring 12 are usually Because the axial clearance between the rings is in the range of several microns, thermal deformation of the rotating ring 7 As a result, the seal ring 12 and the rotating ring 7 further come into contact, and the deformation of the rotating ring 7 progresses. There was a problem that

0012 This invention was devised to solve the problems of the conventional technology. The purpose is to provide a gas seal device that can suppress thermal deformation of the ring as much as possible. do.

[0013]

[Means to solve the problem]

In order to solve the above problems, the present invention includes a rotating ring fixed to a rotating shaft, and a rotating ring fixed to a rotating shaft. The seal ring attached to the casing surrounding the shaft forms a shaft sealing surface to prevent high pressure. In a gas seal device that seals between a chamber and a low pressure chamber, a On the other hand, if the sliding surface of the rotating ring is coated with a material with good sliding properties such as cemented carbide, At the same time, the surface of the rotating ring opposite to the sliding surface in the axial direction also has a coating on the sliding surface. It is coated with the same material as the ring.

[0014]

[Effect]

According to the above means, the sliding surface of the rotating ring is usually made of cemented carbide or the like with high thermal conductivity. It is coated with a material with a low coefficient of linear expansion, and the sliding surface of the rotating ring and seals by coating the same material on the axially opposite surface. The base material of the rotating ring protects against thermal deformation due to heat generation due to contact rotation between the ring and the rotating ring. Thermal deformation of stainless steel material, which has a higher coefficient of linear thermal expansion than the coating material, is the main focus. The coating material provided on both sides of the rotating ring restrains it and suppresses thermal deformation of the rotating ring. Wear.

[0015]

【Example】

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. Figure 1 is a sectional view showing the gas seal device according to this embodiment, and FIG. 2 is an enlarged view of the rotating ring in FIG. A cross-sectional view, FIG. 3, is a diagram showing thermal deformation of the rotating ring.

[0016] 1 and 2, this gas seal includes a rotating shaft 21, a fixing ring 22 and a support. A rotating ring 25 fixed by a nut 24 via a ring 23, and a rotating ring 25 surrounding the rotating shaft 21. A shaft sealing surface is formed with a seal ring 27 attached to a casing 26, It is configured to seal between the high pressure chamber 28 and the low pressure chamber 29.

[0017] Further, the seal ring 27 is disposed between the seal casing 30 and the retainer 31. The spring 32 is placed in such a way that it is in close contact with the rotating ring 25 at all times.

[0018] Furthermore, the sliding surface of the rotating ring 25 facing the seal ring 27 is made of cemented carbide or the like. A coating layer 33 is applied to the sliding surface, and the sliding surface is rotated by the rotation of the rotating shaft 21. The spiral groove 34 is formed in the circumferential direction in a direction that draws in gas from the outer circumference of the ring 25 to the inner circumference. There are multiple locations.

[0019] The surface of the rotating ring 25 opposite to the sliding surface is also provided with the same structure as the sliding surface. A coating layer 35 coated with one material is provided.

[0020] Next, the effect will be explained. Now, the rotating ring 25 and the seal ring 27 are in contact with each other. When the rotating shaft 21 rotates in this state, the temperature of the rotating ring 25 increases due to heat generation on both sliding surfaces. degree increases.

[0021] At this time, the material of the coating layers 33 and 35 provided on both sides of the rotating ring 25 in the axial direction Since a material with good thermal conductivity is used as the base material of the rotating ring 25 and both axial surfaces The temperature of the coating layers 33 and 35 also increases. However, the coating layer 33 , 35 has a smaller coefficient of linear expansion than the base material of the rotating ring 25, so thermal deformation of the base material acts in the direction of suppressing

[0022] In this case, the coating layer 33 is coated only on the sliding surface of the rotating ring 25. Compared to the case, coating layers 33 and 35 are provided on both sides of the rotating ring 25 in the axial direction. This is highly effective in suppressing thermal deformation of the rotating ring 25.

[0023] That is, according to the structure of this embodiment, the contact between the seal ring 27 and the rotating ring 25 is reduced. For thermal deformation due to heat generation due to rotation, as shown in FIG. Due to the deformation restraining effect of the coating layers 33 and 35 provided on both sides in the direction, the rotating ring 2 It becomes possible to reliably suppress thermal deformation of 5 itself.

[0024] It goes without saying that the present invention can also be applied to the gas seal device shown in Figure 4. . That is, the coating layers 33, 3 in FIG. 1 are coated on both sides in the axial direction of the rotating ring 7 in FIG. 5, due to the deformation restraining effect of the coating layers 33 and 35, , it becomes possible to suppress thermal deformation of the rotating ring itself.

[0025]

[Effect of the idea]

As described above, according to the present invention, the seal ring in the gas seal device The sliding surfaces of opposing rotating rings are coated with a material with good sliding properties, such as cemented carbide. At the same time, the coating on the sliding surface is also applied to the surface of the rotating ring opposite to the sliding surface in the axial direction. The structure is coated with the same material as the seal ring, making it similar to the seal ring. Thermal deformation of the rotating ring due to heat generation due to contact rotation with the rotating ring can be suppressed as much as possible. It has the excellent effect of

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a gas seal device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the rotating ring in FIG. 1;

FIG. 3 is a diagram showing thermal deformation of the rotating ring.

FIG. 4 is a sectional view showing an example of a conventional gas seal device.

FIG. 5 is a sectional view showing another example of a conventional gas seal device.

6 is an enlarged sectional view of the rotating ring in FIG. 5. FIG.

FIG. 7 is a diagram showing thermal deformation of the rotating ring.

[Explanation of symbols]

21 Rotation axis 25 Rotating ring 26 Casing 27 Seal ring 28 Hyperbaric chamber 29 Low pressure chamber 33 Coating layer 35 Coating layer

Claims (1)

[Scope of utility model registration request] Claim 1: A gas seal device that seals between a high pressure chamber and a low pressure chamber by forming a shaft sealing surface with a rotating ring fixed to a rotating shaft and a seal ring attached to a casing surrounding the rotating shaft. The sliding surface of the rotating ring facing the seal ring is coated with a material with good sliding properties such as cemented carbide, and the surface of the rotating ring opposite to the sliding surface in the axial direction is also coated. A gas seal device characterized by being coated with the same material as the coating on the sliding surface.