Rotating shaft sealing structure

Abstract

The utility model discloses a rotating shaft sealing structure which comprises a rotating shaft, a bearing box, a moving ring arranged on the rotating shaft and a static ring connected with the bearing box. A first conical surface is arranged on the outer wall of the movable ring, a second conical surface is arranged on the inner wall of the static ring, and the first conical surface and the second conical surface are attached to each other. According to the technical scheme provided by the utility model, the moving ring and the static ring are matched through the conical surface, so that the rotating shaft can normally rotate at a high speed, and meanwhile, a good sealing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing technical field, especially a rotating shaft sealing structure. BACKGROUND

[0002] The stirring shaft of the stirring equipment is connected with the stirrer after passing through the bearing box. In actual operation, the stirring shaft (i.e. rotating shaft) rotates at high speed, and the material may enter the bearing box from the end cover of the bearing box. In the prior art, the oil seal (or similar simple sealing structure) is usually used between the end cover of the bearing box and the stirring shaft for sealing. However, the skeleton oil seal is only used to prevent the lubricating grease in the bearing from overflowing, and does not prevent the material from entering the bearing box. Therefore, in actual operation, the material entering the bearing box along the rotating shaft will cause damage to the bearing, and further cause shutdown and maintenance. In view of the above technical problems, the present application provides a new rotating shaft sealing structure to improve the sealing effect and prevent the material from entering the bearing box, so as to prevent the bearing in the bearing box from being damaged. SUMMARY

[0003] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a rotating shaft sealing structure to solve the technical problem that the sealing structure between the stirring shaft and the bearing box in the prior art is simple and cannot effectively prevent the material from entering the bearing box.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A rotating shaft sealing structure, comprising a rotating shaft, a bearing box, a dynamic ring arranged on the rotating shaft, and a static ring connected with the bearing box; the outer wall of the dynamic ring is provided with a first taper surface, the inner wall of the static ring is provided with a second taper surface, and the first taper surface and the second taper surface are mutually fitted.

[0006] Further, in the rotating shaft sealing structure, the inner wall of the static ring is provided with an annular protrusion, and the second taper surface is arranged on the annular protrusion.

[0007] Further, in the rotating shaft sealing structure, the bearing box is provided with an end cover, and the static ring is connected with the end cover of the bearing box.

[0008] Further, in the rotating shaft sealing structure, the dynamic ring and the end cover are provided with a labyrinth sealing structure.

[0009] Further, in the rotating shaft sealing structure, an annular groove is arranged at the top of the end cover, and a skeleton oil seal is arranged in the annular groove.

[0010] Further, in the rotating shaft sealing structure, the static ring is made of polytetrafluoroethylene.

[0011] Further, the rotating shaft sealing structure, the dynamic ring is made of stainless steel.

[0012] Further, the rotating shaft sealing structure, the dynamic ring is made of stainless steel.

[0013] Beneficial effect: the utility model provides a rotating shaft sealing structure, compared with prior art, through setting up dynamic ring and static ring, and the dynamic ring and static ring are matched through the taper surface, thereby guaranteeing that rotating shaft can rotate normally high speed, simultaneously good sealing effect is played, avoids material when stirring to enter bearing box, makes the service life of bearing guarantee, reduces maintenance frequency. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model provides a rotating shaft sealing structure application in the perspective view of rotating shaft.

[0015] Figure 2 The utility model provides a rotating shaft sealing structure application in the sectional view of rotating shaft.

[0016] Figure 3 For Figure 2 The local amplification drawing of S area in middle.

[0017] Figure 4 It is the perspective sectional view of dynamic ring.

[0018] Figure 5 It is the perspective sectional view of static ring.

[0019] Mark in drawing:

[0020] 1, dynamic ring, 10, first recess, 11, first protruding, 18, first taper surface, 19, extension section, 101, sealing ring installation groove, 190, locking screw hole,

[0021] 2, static ring, 20, connecting hole on static ring, 21, annular protruding on static ring, 28, second taper surface,

[0022] 3, skeleton oil seal,

[0023] 4, sealing ring,

[0024] 7, bearing,

[0025] 8, bearing box, 81, end cover of bearing box, 811, second protruding,

[0026] 9, rotating shaft. DETAILED DESCRIPTION

[0027] The utility model provides a kind of rotary shaft sealing structure, to make the purpose, technical scheme and effect of the utility model more clear, definite, the following further detailed description of the utility model is described in the specific embodiments here.

[0028] Please refer to Figures 1 to 5 The utility model provides a kind of rotary shaft sealing structure. The drawing is only used to explain the structure principle, not proportional with actual product. The drawing has only drawn the structure relevant to the invention point of the present application, and has not specifically drawn for some conventional structure. The "first", "second" and the like described in this paper are merely different naming for similar structures to facilitate exposition, not to limit the present application. In order to facilitate exposition, some orientation words are inevitably used in this paper, but these orientation words do not limit the present application.

[0029] The rotary shaft sealing structure includes rotary shaft 9, bearing box 8, setting in rotary shaft dynamic ring 1, and with bearing box connection static ring 2;The outer wall of dynamic ring is provided with first taper surface 18, and the inner wall of static ring is provided with second taper surface 28, and the first taper surface and the second taper surface mutually adhere (i. e. the taper of first taper surface and second taper surface is equal).

[0030] It can be understood that, in order to realize assembly, the shape surrounded by the above-mentioned first taper surface and second taper surface is not a complete cone, but a truncated cone. Since the tapers of the first cone and the second cone are equal, the dynamic ring can rotate relative to the static ring.

[0031] Further, the inner wall of the static ring is provided with an annular protrusion 21, and the second taper surface 28 is arranged on the annular protrusion 21. The significance of this arrangement is that (1) the dynamic ring only contacts the annular protrusion of the static ring, but not the entire inner wall of the static ring, thereby playing a sealing role and reducing the friction between the dynamic ring and the static ring during rotation; (2) after a period of use, the annular protrusion is worn, the second inclined surface and the first inclined surface are no longer completely adhered, and the sealing effect is deteriorated; at this time, only the connecting bolts on the static ring (used to connect the static ring and the bearing box, only the connecting holes corresponding to the connecting bolts are drawn in the figure) are further tightened, the static ring moves a certain distance towards the bearing box, and the second taper surface on the annular protrusion adheres to the first taper surface again; adjust once every time the wear reaches a certain degree, until the static ring cannot be used completely, the arrangement of the annular protrusion facilitates the adjustment of the static ring during use, and also prolongs the service life of the static ring.

[0032] Further, the bearing box is provided with an end cover 81, and the static ring is connected with the end cover of the bearing box. This arrangement retains the structure of the end cover of the bearing box, instead of arranging the end cover as the structure of the static ring. The significance of this arrangement is that: (1) it is convenient to modify the existing bearing box to add the static ring; (2) if the static ring is worn or damaged, only the static ring needs to be replaced, instead of replacing the entire end cover, so that the installation and replacement of the static ring are more simple.

[0033] In order to further improve the sealing effect, the dynamic ring and the end cover are provided with a labyrinth seal structure. As shown in the drawings, the dynamic ring is provided with more than one first protrusion 11 and more than one first groove 10, and the end cover is provided with more than one second protrusion 811 and more than one second groove (corresponding to the position of the first protrusion), and the above-mentioned first protrusion and more than one first groove are embedded into the corresponding second groove and second protrusion, thereby forming a labyrinth seal.

[0034] Further, the top of the end cover is provided with an annular groove, and a skeleton oil seal 3 is arranged in the annular groove. Since the skeleton oil seal is arranged between the end cover 81 and the bearing 7, the lubricating grease of the bearing can be prevented from overflowing, and the material can be prevented from entering the bearing.

[0035] Preferably, the static ring is made of polytetrafluoroethylene (i.e. Teflon). This arrangement makes the friction coefficient of the static ring low, and the friction between the dynamic ring and the static ring is small during the rotation of the rotating shaft. In addition, since the polytetrafluoroethylene has good high-temperature resistance and corrosion resistance, the static ring can be used in harsh working environments.

[0036] The dynamic ring is made of stainless steel. This arrangement makes the dynamic ring have certain corrosion resistance. In addition, since the hardness of stainless steel is greater than that of polytetrafluoroethylene, when the dynamic ring and the static ring rub against each other, the static ring is worn; and the static ring is arranged on the outside, and is more easily replaced.

[0037] Further, the dynamic ring is provided with locking screws (only the holes 190 corresponding to the locking screws are shown in the drawings). As shown in the drawings, the bottom end of the dynamic ring is provided with an extension section 19, and the locking screws are arranged on the extension section. The locking screws are used to fix the dynamic ring on the rotating shaft.

[0038] Since the dynamic ring and the rotating shaft are in interference fit, generally the material cannot pass between the dynamic ring and the rotating shaft. However, in order to further improve the sealing effect, a sealing ring mounting groove 101 can be arranged on the inner wall of the dynamic ring, and a sealing ring 4 is arranged in the sealing ring mounting groove 101, thereby ensuring the sealing effect between the dynamic ring and the rotating shaft.

[0039] Through the above analysis, compared with the prior art, the application only adds the dynamic ring and the static ring, and the dynamic ring and the static ring are matched through the taper structure, so that the dynamic ring and the static ring can normally rotate, and also play a sealing role. Since the first taper and the second taper are attached together, the sealing effect produced is obviously due to the ordinary skeleton oil seal.

[0040] It should be noted that some directions are inevitably used in this paper, which are described based on the perspective of the drawings (i.e., the rotating shaft is vertically set downward). However, the application does not limit the stirring shaft to be obliquely set, horizontally set or vertically set upward.

[0041] It can be understood that for those skilled in the art, the technical scheme and the utility model concept of the utility model can be replaced or changed equivalently, and all these changes or replacements shall belong to the protection scope of the utility model.

Claims

1. A rotating shaft sealing structure, comprising a rotating shaft and a bearing housing, characterized in that: It also includes a rotating ring disposed on the rotating shaft and a stationary ring connected to the bearing housing; the outer wall of the rotating ring is provided with a first conical surface, and the inner wall of the stationary ring is provided with a second conical surface, the first conical surface and the second conical surface are in contact with each other; the inner wall of the stationary ring is provided with an annular protrusion, and the second conical surface is disposed on the annular protrusion; the bearing housing is provided with an end cover, and the stationary ring is connected to the end cover of the bearing housing.

2. The rotary shaft sealing structure according to claim 1, characterized in that: The moving ring and end cap are equipped with a labyrinth seal structure.

3. The rotary shaft sealing structure according to claim 1, characterized in that: An annular groove is provided on the top of the end cap, and a skeleton oil seal is installed in the annular groove.

4. The rotary shaft sealing structure according to claim 1, characterized in that: The stationary ring is made of polytetrafluoroethylene.

5. The rotary shaft sealing structure according to claim 1 or 4, characterized in that: The moving ring is made of stainless steel.

6. The rotary shaft sealing structure according to claim 1, characterized in that: A locking screw is provided on the moving ring.

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