JPH04132268U - mechanical seal device - Google Patents

Abstract

(57) [Summary] [Purpose] To extend the life of a mechanical seal device and extend the maintenance period for parts replacement, etc. [Structure] The end surface where the rotating ring 12 attached to the main shaft 11 and the fixed ring 16 attached to the casing 13 together with the O-ring 14 and the spring 15 slide against each other (relative sliding cotton S)
The pressure fluid 17 is sealed. A plurality of grooves 18 whose groove depth changes in the circumferential direction are formed in a part of the relative sliding surface S of the fixed ring 16.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is applied to the shaft seal of rotating fluid machines such as water turbines and pumps. Regarding Calseal device.

0002

[Conventional technology]

Figure 9 shows a cross-section of a conventional mechanical seal device used in the shaft seal of fluid machinery. It is a front view.

0003 In FIG. 9, the conventional mechanical seal device has a together with the fixing ring 4, spring 5 and O-ring 6 to prevent the pressure fluid 3 from flowing out. It is attached to casing 2.

0004 The spring 5 causes the fixed ring 4 to rotate to the rotating ring 7 attached to the main shaft 1. , forming a relative sliding surface S and sealing the pressure fluid 3.

[0005]

[Problem that the idea aims to solve]

Fluid machinery equipped with mechanical seal devices such as the one above operates in a variety of ways, including high-speed operation. There are models that frequently perform forward and reverse rotations at high circumferential speeds and high surface pressures.

[0006] In such a case, in the conventional mechanical seal device shown in Fig. 9, the fixed The relative sliding surfaces S between the ring 4 and the rotating ring 7 may contact and slide, or may be sealed. Even if a fluid film is generated by the pressure fluid 3, it is very thin and the sliding material (fixing ring 4, rotating It is often thinner than the surface roughness of the rolling ring 7).

[0007] Therefore, the fixed ring 4 and the rotating ring 7 are subject to a lot of wear due to strong contact and sliding. Maintenance such as replacement of the sliding fixed ring 4 and rotating ring 7 due to shortened lifespan had to be done frequently.

[0008] This invention was devised to solve the problems of the conventional technology. In addition to extending the maintenance period for parts replacement, etc. The purpose of the present invention is to provide a mechanical seal device that has the following characteristics.

[0009]

[Means to solve the problem]

In order to solve the above problems, the present invention includes a fixing member, a penetrating member that penetrates the fixing member, A small gap is formed between the rotating member that can freely rotate forward and reverse, and the rotating member and fixed member In a mechanical seal device that seals fluid by sliding relative to each other, the front A constant width in the circumferential direction is provided on one of the opposing sliding surfaces of the rotating member and the fixed member. A groove that decreases in depth and a groove that increases in depth with a constant width in the circumferential direction. It is.

0010

[Effect]

According to the above means, the sealing fluid is in the groove of the relative sliding surface between the rotating member and the stationary member. is guided, and the fluid moves in the rotational direction inside the groove due to the rotational force of relative sliding. So At this time, the fluid is squeezed and compressed in the groove where the groove depth decreases in the direction of rotation, generating pressure. do. Therefore, strong contact between the stationary member and rotating member is prevented, and sliding surfaces are lubricated. and prevents wear from progressing.

[0011] This means that even if the mother machine rotates forward and reverse under high surface pressure and high circumferential speed operating conditions, Since the grooves are configured such that the groove depth decreases, the above action is effective in both directions of rotation. Demonstrate results. In addition, the flat surface of the sliding surface without grooves is designed to seal the fluid. It works especially well.

0012

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 8. .

[0013] FIG. 1 is a sectional view showing a mechanical seal device according to a first embodiment of the present invention. Ru. A rotating ring 12 mounted on the main shaft 11, an O-ring 14 on the casing 13, The end surface (relative sliding surface) where the fixed ring 16 attached together with the spring 15 slides against each other. S) constitutes a mechanical seal for sealing the pressure fluid 17. So A part of the relative sliding surface S of this fixed ring 16 has a groove depth that changes in the circumferential direction. A groove 18 is formed.

[0014] FIG. 2 is an enlarged view taken along the line II-II in FIG. The arrangement state of the grooves 18 (first groove 18A, second groove 18B) formed on the moving surface S is as follows. It shows. The first groove 18A and the second groove 18B are opposed to the fixing ring 16 in the circumferential direction. A plurality of them are arranged alternately on the same radius with a constant width. Note that numeral 19 is a fluid seam. Shows the side.

[0015] FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2, showing an axial cross section of the groove 18. Ru. The first groove 18A is formed so that the depth decreases toward the circumferential direction arrow A. The depth of the second groove 18B increases in the direction of the arrow A. It is formed.

[0016] In the mechanical seal device configured as described above, the rotating ring 12 is The pressure fluid 17 rotates together with the main shaft 11, and the plane of the sliding surface S relative to the fixed ring 16 and the O-ring 14 installed between the casing 13 and the fixing ring 16. sealed.

[0017] In addition, the pressure fluid 17 is also guided into the groove 18 due to the rotational force of the rotating ring 12. It moves in the groove 18 in the direction of rotation. At that time, the groove depth decreases in the direction of rotation. At 18A or 18B, the pressure fluid 17 is compressed and pressure is generated. This pressure The fixed ring 16 and the rotating ring 12 do not come into contact with each other, and their sliding parts are covered as shown in FIG. A fluid film thickness h is formed.

[0018] Now, to explain the operation with reference to FIG. 4, the horizontal axis is the positive direction of the rotating ring 12. , with a reverse rotational speed, the vertical axis is formed between the fixed ring 16 and the rotating ring 12. shows the fluid film thickness h.

[0019] In the case of this embodiment, as shown by the solid line 20, the flow increases as the forward and reverse rotational speeds increase. The body film thickness h increases and exceeds the surface roughness of the sliding surface, preventing wear at high circumferential speeds. It has the effect of On the other hand, the conventional one, as shown by the dotted line 21, Only a finer water film is generated, and the wear of the sliding surface progresses. In addition, the dashed-dotted line 22 Indicates the surface roughness of the sliding surface.

[0020] In this embodiment, as shown in FIG. 2, the first groove 18A and the second groove 18B are arranged alternately. Because of the arrangement, it is not affected by the direction of rotation of the rotating ring 12, and the motherboard rotates in the forward and reverse directions. In the machine, the above effects can be obtained in the same way.

[0021] Next, FIG. 5 shows a second embodiment of the present invention, in which the arrangement of the groove 18 on the fixing ring 16 is It is double grooved in the radial direction (first groove 18A, second groove 18B), and the first The groove 18A has a constant width and the depth decreases in the circumferential direction, and the second groove 18B is a groove with a constant width and increasing depth in the circumferential direction. To configure it like this As a result, a fluid film is formed as described above both in the forward and reverse directions of the rotating ring 12. Ma In addition, the fluid is sealed at the flat surface (fluid sealing surface 19). Note that S is relative sliding. It is a surface.

[0022] Furthermore, FIGS. 6 and 7 show the third and fourth embodiments of the present invention, respectively. The groove 18 provided in the ring 16 is doubled in the radial direction (first groove 18A, second groove 18 B), and even with this configuration, it is the same as the embodiment described above. It has similar effects. In addition, in FIGS. 6 and 7, 19 is a fluid sealing surface, and S is a relative surface. Shows the sliding surface.

[0023] The grooves according to the present invention are not limited to the above embodiments, for example, FIG. As shown in FIG. Formed shallowly in a step-like manner in the direction of rotation shown in It may be formed into a slobe shape or a groove shape that is a combination thereof.

[0024]

[Effect of the idea]

As described above, according to the mechanical seal device according to the present invention, the mother machine can be Regardless of rotation or reversal, fluid will not be present on the relative sliding surface between the fixed member, which is the sealing surface, and the rotating part. A film forms and prevents strong direct contact between solids on the sliding surface, resulting in improved seizure resistance. improves. In addition, since the sealing fluid on the sliding surfaces provides good lubrication, high-pressure surfaces and high-circumference Wear is minimized even at high speeds.

[0025] Therefore, according to the present invention, the life of the mechanical seal device is extended, and the parts This has various excellent effects such as lengthening maintenance periods such as product replacement.

[Brief explanation of drawings]

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

FIG. 2 is an enlarged view taken along the line II-II in FIG. 1;

FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2;

FIG. 4 is an explanatory diagram of the operation of the present invention.

FIG. 5 is a plan view of main parts of a fixing ring according to a second embodiment of the present invention.

FIG. 6 is a plan view of main parts of a fixing ring according to a third embodiment of the present invention.

FIG. 7 is a plan view of main parts of a fixing ring according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a main part of a fixing ring according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view showing a conventional mechanical seal device.

[Explanation of symbols]

11 Main shaft 12 Rotating ring 13 Casing 14 O-ring 15 Spring 16 Fixed ring 17 Pressure fluid 18 Groove 18A 1st groove 18B Second groove 19 Fluid seal surface S Relative sliding surface

Claims (1)

[Scope of utility model registration request] Claim 1: A fixed member;
In a mechanical seal device that seals a fluid by forming a minute gap between the rotary member and the fixed member and sliding the rotary member and the fixed member relative to each other, the rotating member and the fixed member are opposed to each other. A mechanical seal device characterized in that one sliding surface is provided with a groove whose depth decreases with a constant width in the circumferential direction and a groove whose depth increases with a constant width in the circumferential direction.