JPS61236970A - Shaft sealing device and automatic circulating lubricating system thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The invention relates to a rotary shaft (
rotaHon 5haft) (DftMef) relates to an adjustable sealing device and an automatic circulation lubrication system therefor.

It is well known that prior art sealing devices play an important role in a variety of shafts, and that prior art sealing devices are capable of sealing rotating shafts to a certain degree under normal operating conditions. However, such conventional sealing devices have a common defect of losing effectiveness before their lifespan when operating under adverse conditions, which not only increases maintenance costs but also leads to leakage and contamination, and even shutdowns. This can lead to serious accidents like this.

For example, in the rotating shaft sealing device disclosed in U.S. Pat. No. 4,139,1450, as shown in FIG. This forms a close axial sealing surface between the rotating seal ring and the stationary seal ring. The radial seal is
The stationary seal ring is attached to the shaft so that it can be moved a little.
It is implemented using a 0 type seal ring.

In this type of seal device, the stationary seal ring must be fixed on a housing that is immovable with respect to the rotating shaft by a '0〃 type seal ring and a movable pin (key).
It is clear that this has the disadvantage that the adjustment range is limited. Furthermore, in actual driving,
Unavoidable radial off-centering and subsidence of rotating shafts, especially those with cantilever bearings, and possible wear of the shaft due to the presence of only small gaps between the stationary seal ring and the rotating shaft and stationary seals. It is possible for the ring to rotate with the axis. Such radial off-centering and depression of the rotating shaft will lead to irregular contraction and rapid wear of the 10L type radial seal ring when the stationary seal ring rotates with the rotating shaft, causing damage to the radial seal of the sealing device. loses its effectiveness very quickly. At the same time, when the %OII type seal ring is fixed on the rotating shaft, it is not easy to control the tightening margin between the seal ring and the rotating shaft. It is also clear that it is very difficult to guarantee a reliable radial seal if the radial seal is allowed to slide somewhat along the axis. Particularly when the sealing device has been used for a period of time, this tightness cannot be guaranteed at all. In addition, the axial thickness of the stationary seal ring increases in order to fix the −〇 type seal ring and secure a constant dimension in the guide part, so the dimensions of the entire sealing device are clear. It can be seen that it increases to Moreover, if such a sealing device is used in water containing sand, the wear of the sealing surface will also be greatly increased as water will enter the said sealing surface.6 Another type of mechanical rotary shaft sealing device is Patent No. 446395
It is also disclosed in No. 8. In this device, a stationary seal ring is fixed directly to the housing and simultaneously provides both directional and radial sealing between a rotating seal ring sleeve-connected on the shaft. In order to alleviate the above-mentioned disadvantages, a coil spring sleeve-connected on the shaft rotates the rotary seal ring by means of a thrust ring.However, it is not possible for the thrust ring to rotate the %Q1 part of the rotary seal ring only by contact between them. Such radial seals are unreliable when the rotating seal ring rotates because of the difficulty. It can be seen that the rotating sealing ring tends to buckle when the coil spring is compressed onto it, so this sealing element is no longer usable. Furthermore, when pressurized lubricant enters the chamber formed by the rotating seal ring and the rotating shaft, the pressure of the lubricant tends to resist the pressure applied by the thrust ring to the OI portion of the rotating seal ring; When the lubricant pressure is high enough, this seal becomes completely unusable. Since there is a large gap between the inner wall of the rotary seal ring and the shaft except for the Fi%01 part and there is no locking cylinder, the rotary seal ring moves selectively, thereby preventing abnormal wear and sealing. It can be seen that lubricant leakage at the surface is inevitable.

Problems to be Solved by the Invention The conventional rotary shaft sealing device as described above, when applied to a stern propeller shaft system, further has problems as described in detail below. This is because the seals of stern shaft systems, which operate in very unfavorable environments when the ship navigates different waters, are much more difficult to seal compared to pond-type shaft systems. , the stern tube bearing sealing device is used in KWI to seal water and oil.

Its reliability has a direct impact on the ship's operational efficiency. Marine stern tube bearings are divided into two groups: open view and closed type. Generally speaking, open type stern tube bearings that use water as a lubricant and coolant have the advantage of being mass-produced in structure, economical to operate, and free from leakage at the stern shaft.
Wear of the stern tube bearing is significant when used in waters containing large amounts of sand. Closed stern tube bearing, uses oil as lubricant and coolant, can be used in any water, but
A set of reliable sealing devices is required, otherwise it is difficult to contain the stern shaft system 9 leakage.

In the prevailing method for end-seven-eighth seals, the radial and axial seals are generally performed separately in two elements. i.e. a soft element like a rubber ring is used for the radial seal and a hard element like a metal or Bakelite ring is used for the axial seal.Thus the contact between the rotating ring and the static IJ song is rigid or semi-rigid. As a result, if the sealing surfaces are in perfect contact, oil or water films will not easily form. Therefore, the friction between the rotating ring and the stationary ring will be dry or semi-dry friction, and the service life will be greatly affected by it. Conversely, if the sealing surfaces are not in complete contact, a large amount of oil (water) will leak out. This is the power of Hito (apee) to enable sealing.
This means that the reasonable range of (ifie pressure) is very narrow and difficult to control and adjust. The wear resistance of many currently used hard materials, such as hard metals, is limited, so their lifetime and sealing ability cannot be significantly increased. Furthermore, in traditional end-face seals, a special fork or key mounted on the shaft is used to drive the rotating ring. If the rotating ring is severely worn or the key is not seated properly, , the rotating ring becomes dislodged from the 7 oak or key, thereby causing a significant leakage. Lubrication of the sealing elements in conventional sealing devices continues to deteriorate as automatic circulation of lubricant has not yet been successfully implemented. This accelerates the wear that occurs between the seal rings and on the contact surfaces of the shaft or bearing.

The present invention was devised in order to solve the above-mentioned problems regarding the conventional rotary shaft seal system fK, and its purpose is to not only maintain an effective seal in various environments, but also to It is an object of the present invention to provide a sealing device for a rotating shaft that does not require specialized workers for operation and repair during operation and is lubricated and cooled by oil or water. To provide a sealing device for a rotating shaft that can automatically compensate or manually easily adjust the specific pressure of a sealing surface when a sealed end face is worn.

The purpose of the Vc pond of this invention is to have a long service life, simple structure, perfect sealing effectiveness, no lubricant dripping, seepage and leakage phenomenon, and easy adjustment. To provide a rotary shaft seal device that is suitable for use in emergencies, has a low initial cost, and can be used in various operating conditions without requiring management during operation.

A further object of the invention is to provide an automatic circulation lubrication system for a sealing device according to the invention to improve the working conditions of the working surfaces of the sealing part of a bearing, in which the lubricant is Automatically circulated without oil pump and liquid circulation cap, filtered, precipitated and cooled by λ.

Means for Solving the Problems The configuration of the present invention for solving the above problems will be explained with reference to FIG. 1 corresponding to the first embodiment. A rotating shaft sealing device having an elastic seal ring that performs both sealing and axial sealing, and a coil spring 9 that is sleeve-connected to the rotating shaft and presses a sealing surface formed by the rotating seal ring and the stationary seal ring 6. The elastic sealing ring is a rotary sealing ring 7 with two sub-digital end faces, the axial inner rectangle jII between which is smaller than the difference between the outer radius of the sealing ring 7 and the radius of the rotational axis, and the rotational axis The sleeve S is connected with an interference margin at the top, one of the four sides contacts the stationary seal ring 6 to form a tight axial sealing surface, and the end face of the pond is such that the entire rotating seal ring 6 is connected to the sleeve S. uniformly contacting the stationary seal ring 6 to form a v14 adjustable self-tightening system;
The sealing surface is pressed by a compression spring 9 having an outer diameter smaller than the diameter of the rotary seal ring 7, a spring tray 10, and a rotary seal 11 ring tray 8 so that the sealing surface can compensate for wear of the sealing surface. It is characterized by the fact that

A second invention of the present application is an automatic circulation lubrication system for the rotary shaft sealing device of the first invention, and the invention provides a circulating lubricant tank 51. Oil supply pipe 53% Oil return pipe 58 and check valve 5
6.57 and has an elastic sealing ring that performs both radial and axial sealing, and a coil panel that is sleeve-connected to the rotating shaft and presses the sealing surface formed by the rotating and stationary sealing rings. An automatic circulation lubrication system used in a rotating shaft sealing device, which does not require a circulation oil pump or circulation, and the oil supply pipe,
It is characterized in that an automatic circulation circuit is formed by the oil return pipe and the rotating shaft sealing device.

By using at least 16 elastic sealing rings 7 with a sufficient cross-sectional area, both radial and axial sealing is achieved simultaneously. And, y4g due to the 7 elastic seal rings and 9 pressure springs! 15] is pressed and driven in such a way that sufficient specific pressure is always maintained to contact the shaft and maintain a seal on the end face◎ Also, at least one screw #! Since the grooves are provided on the inner wall of the shaft or on the surface of the shaft itself, the lubricant will automatically circulate as the shaft rotates even if the oil pump and circulation system R are removed.

EXAMPLES Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the sealing device is divided into two parts, each located at each end of the stern tube. The principle of these two parts is practically the same, but the structure is somewhat different. , a ring 7 as a rotary sealing ring (hereinafter referred to as a single rotation ring) made of an oil- and wear-resistant material of sufficient thickness, such as oil- and wear-resistant rubber.
, consisting of a cylindrical pressure spring 9 provided for pushing the rotating ring 7 towards the stationary sealing ring 6 (hereinafter referred to as the dovetail ring I) and a pond sealing element 11 sleeve-connected on the stern shaft. . There is an interference fit between the rotating ring 7 and the stern shaft to obtain a radially static seal. Together with the pressure spring tray 10 and the rotating ring tray 8, the rotating ring 7 is pressed by the compression spring 9 towards the friction surface of the stationary ring to achieve axial sealing of the stern shaft. The stationary sealing element 12 is a hollow plug with at least one annular groove on its outer surface for seating the type seal ring 11 and in its inner surface in the direction of rotation of the stern shaft rotating clockwise. and at least one groove wound in the same direction as the groove. Part 1. 2. The stationary ring 6 and the rotating ring 7 define the seal chain. The stationary ring 6 and the stationary sealing element 12 are connected by at least two bolts to achieve a complete seal. Connected to the stern tube.

To ensure automatic circulation of lubricant, there must be at least one helical groove on the inner surface of the stern tube bearing. This helical groove, together with the stationary ring's upper oil supply pipe, seal chamber, hollow plug 12, and stern tube's upper oil return pipe, forms a self-circulating lubrication system, which will be explained in more detail later with reference to Figure 6. explain.

The bead of the rotating ring tray provides a contraction force that fits the rotating ring snugly onto the stern shaft and keeps it in an anti-press condition to avoid dimensional shrinkage and oil leakage caused by year-round oil immersion and deterioration. To ensure that the outer circumference of the rotating ring is pressed. The compression spring tray 10 is fitted onto the stern shaft. It is equipped with a compression spring tray 10, a rotating ring tray, and 8 key slots. The square keys located on the outside of both ends of the spring 9 are pressed into their slots.1. be included. The lateral clearance of the key is relatively large, and the shaft can not only move freely back and forth in the axial direction, but also slide slightly between the rotating ring 7 and the stern shaft, and the shaft can be moved for a long time between the rotating ring 7 and the stern shaft. Prevents bowing and sticking when there is no slippage between the two. When the stern shaft shifts axially for some reason, the rotating ring 7 can instantaneously move back and forth in the axial direction by the spring 9 to come into close contact with the anti-friction surface of the stationary ring, maintaining a good sealing condition.

One or more annular grooves may be formed on the inner surface of the rotary ring in order to ensure free sliding of the rotary ring on the stern axis and to maintain a good radial seal.

The Station II Song is made of a hard, abrasion resistant material.

The sealing surface of the rotating ring 7 is fitted with a wear-resistant material. This is effective in reducing ring overstriking caused by very high pressures or unfinished seal surfaces during initial operation. During operation, the static ring made of hard material is written by the rotating ring, so that the sealing surface of the static ring will have a mirror finish within a certain period of time after operation.

In order to increase the reliability of the seal, a set of preliminary sealing devices consisting of a rotating sealing ring 5 and its fixing and adjusting elements 2.3.4 is also provided.

When the stern shaft shifts axially, the preliminary sealing device increases the sealing capacity and acts as a locking bolt. The adjustment moves the stationary ring 6 in the axial direction, thereby adjusting the specific pressure between the rotating ring 7 and the me surface of the stationary ring 6 to obtain a tight sealing result.

The seal structure c located at the outboard end (hereinafter simply referred to as the airborne outer seal I) is substantially the same as me described above. The seal chamber consists of a rotating ring 15.19 and a stationary ring 1.
4.20 Noil! It is formed by contact between Li-mian and Li-mian. Lubrication in the sealing chamber is provided by grease. Similarly, a preliminary seal ring 21 is placed between the outside of the stationary ring 2o and the propeller to improve the sealing ability.

The device of the first embodiment is characterized in that the III structure is easy to adjust. In addition, the shaft coupling no.
of the rotating ring 7 when the mouth is opened, the sealing condition of the sealing surface can be adjusted. tCe
The specific pressure of the face stationary ring 6 can be adjusted independently by means of adjustable bolts 13.Furthermore, an automatic circulation lubrication system, which will be described later, can be employed.

A second embodiment of the invention will be described with reference to FIG. It is clear that the principle and structure of the second embodiment are exactly the same as the first embodiment described above. The slight differences are that there is no reserve ring 5 and fixing member 2.3.4 at the inboard sealing end and that the stationary ring sleeve 37 is fixed only to the stern tube. The hollow plug is fixed in an adjustable manner on the stationary ring sleeve and has at least one annular ring for filling with wear-resistant material as the stationary ring 6 in contact with the two rings 7 on the sealing surface. 7. The specific pressure of the contact surface between the hollow plugs (stationary rings) 6 can be adjusted by adjusting the bolts 38. The contraction force acting on the stern shaft by the rotating ring is stabilized via a rotating ring tray that has an internal conical surface and is biased by a spring. The part of the tray sleeved on the stern shaft has at least one through groove which slips into the key of the stern shaft to ensure that the compression spring 9 rotates together with the rotary seal ring 7. Two rotating rings 18, 19 and stationary ring 20 of the outboard seal
forms a contact sealing surface. The inboard seal and outboard seal communicate through a helical groove in the stern tube bearing. At the same time, it is lubricated by an automatic circulation lubrication system.

In this embodiment, in exactly the same way as in the first embodiment, by increasing or decreasing the number of gaskets 1 of the shaft coupling 35, the displacement of the stern shaft can be changed and the sealing condition of each seal surface can be adjusted by rotating the mouth. The specific pressure at the contact surface between the seal ring and the hollow plug (stationary ring) can be adjusted independently by adjusting the bolt 38.Furthermore,
The outboard seal 4 of the stern tube can also be lubricated by an automatic circulation lubrication system.

Third and fourth embodiments of the invention will be described in detail with reference to FIGS. 3 and 4. The third and fourth embodiments are of the pure FIA structure type. These do not have the adjustment member located at the forefront of the static seal ring inside the hull, the spare ring, and the gap seal located at the front end face of the propeller and its waterproof rubber ring, and the rotating ring of the external seal ring is static (on the contrary) - It is stuck on the +7 ring. The adjustment method is the same as in the first embodiment. That is, the shaft coupling 35
By increasing or decreasing the gasket l and adjusting the thrust bearing, the stern shaft is moved rearward to firmly press the outboard seal 17, and the inboard seal is independently moved 1- to adjust the specific pressure on the seal surface. Their operational performance is satisfactory, and even if fishing nets become entangled, the outboard seals will not be damaged. These are simply constructed.

``It has advantages such as low manufacturing cost (lower than the manufacturing cost of the first embodiment), and is more suitable for use in medium-sized and small vessels.''

In the fourth embodiment, the stationary ring Fi of the inboard and outboard seals is
Ql) Can be removed. It is easy to carefully manufacture the ring individually and to select the right material for the stationary ring with good thermal conductivity. It is also easy to check for wear on the seal ring. However, it is also suitable for large stern shafts.

A fifth embodiment of the invention will be described with reference to FIG.

This embodiment differs only in the inboard seal. The rotating ring 7Fi makes frictional contact with the front surface of the stationary ring 6 fixed to the stern tube to form a sealing surface. A former compression spring 9, sleeved on the stern shaft, is pressed onto the rotating ring 7 by the trays 8,10. At the end adjacent to the shaft coupling 35,
Support flange 3 with adjustment device (e.g. adjustment screw)
is inserted. 4 & 4 pressure on the contact surface between rotating ring 7 and stationary ring 6 (5 specific pres
sure) can be adjusted independently by adjusting screw 2.

The features of the device described in the fifth embodiment are as follows: The structure is simple; the entire seal is open, so wear on the end face of the seal and the seal condition can be directly inspected; adjustment is easy. When the number of gaskets 1 in the shaft joint 35 is increased and the thrust bearing is adjusted to move the stern shaft in the axial direction, the axial pressure (
5 specific pre-ssure) can be adjusted at the same time and there is no need to adjust them separately.

In a sixth embodiment (not shown) of the invention, the installation includes:
The stationary ring including the sleeve of each of the embodiments shown in FIGS. 1 to 5 is designed in a half-ring type. From a technical point of view, this is more important for large ships.

FIG. 6 is a schematic diagram of an automatic circulation lubrication system for the seal device of the present invention. As can be seen from FIG. 6, the oil pump and circulation device are removed for the first time in this automatic circulation lubrication system. When the ship is sailing, automatic circulation of lubricant is effected by rotation and pulsation of the stern shaft. This automatic circulation lubrication system includes a circulation oil tank 51. The circulation tank 51 includes an upper oil supply pipe 53 equipped with a filtering net at an inlet that is higher than the bottom by H. This automatic circulation system likewise includes an upper oil return pipe 58 without a filter screen at the corresponding inlet h above the bottom of the circulation tank 51. The upper oil supply pipe 53 is provided with a check valve 56, and the upper oil return pipe 58 is also provided with a check valve 57. If desired, a flow rate and flow meter 54 can be attached to the upper oil supply pipe. There is a pipe 52 controlled by a hook 55 for oil level and leakage measurement, which is connected between the outlet of the check valve 56 and the top of the circulation tank 51 to check for oil leakage on each sealing surface. established in

The upper oil supply pipe of the automatic circulation lubrication system is inserted through the coupling member into the seal chamber of the inboard seal on the stern shaft, and is inserted into the helical groove of the hollow plug 12, the stern tube and the outboard seal on the stern shaft (Figs. 2 and 3). , illustrated in Figures 4 and 5)
or directly to the upper oil return pipe (as shown in Fig. 1).Thus, whether the ship is moving forward or backward, the lubricant is always flowing through these helical grooves σ. Can be automatically cycled.

The only difference is the direction of flow. When the check valves 56 and 57 are closed after the cock 55 is opened, the level change in the transparent nylon liquid indicator tube 52 indicates the leakage condition of the seal surfaces in the system.

In the sealing device according to the present invention shown in Figs. 2-5, since the lubricant pressure is applied from inside the hull and from the back of the inner and outer rotary rings, the specific pressure of the sealing ring can be adjusted by changing the height of the oil tank. Alternatively, adjustment can be made by using pond pushing means instead of moving the stern shaft. This adjustment method ensures a pure and easy polishing of the specific pressure across the seal ring.

In this way, the stern axis adjustment interval becomes much longer and the stern axis must be moved when making adjustments - the number of integers is reduced.

Although the above description of the adjustable rotary shaft sealing device and its automatic circulation lubrication system of the present invention is based on the above five embodiments, it is understood that the present invention is not limited to the above scope. Should. All changes and modifications based on this invention made by nine persons skilled in the art are to be considered as being within the spirit and scope of the appended claims.

Effects of the Invention This invention completely solves the leakage and self-circulating lubrication of the stern shaft seal. The invention also has advantages such as simple structure, long service life, low energy consumption, no maintenance, and easy inspection and adjustment.

Furthermore, when installing this sealing device, the cost is less than that of traditional stern shaft sealing devices since there is no need to change the original shafting system. Measurements have shown that when the used lubricant is used as a seal lubricant, the 5specified lubricant consumption is about 201 K/1000 horsepower-hour and can be adjusted.

Attrition occurs essentially at natural wear-rates. This stern axle seal and its bearings will last approximately 70,000 years without dock repair.
Time available. Since the frictional resistance of the seal is very small, the energy consumption of the seal is about 3 horsepower when this seal '11o is used in an ooo horsepower ocean-going vessel. Therefore, this seal can be used under severe conditions, such as in emergency situations, in sandy water or when the stern shaft is shifted axially, when speeding up or down, and during extensive off-centering and subsidence.・When using this, under the above conditions, there are no restrictions on the type of ship or the water area. Durability and compatibility are good.

If the outboard seal breaks for any reason, oil circulation will stop. The emergency performance of the sealing system is also very reliable as long as it supplies a constant amount of lubricating fluid at regular intervals to a ship on a long voyage until yard repairs. Of course, this is based on the internal hull seals (including piping) being in good condition.

Table 1 is a table comparing economic benefits. This table shows that when using a medium-sized cargo and passenger ship (500 horsepower, 600 hp) equipped with two stern shafts with a diameter of 110 m and two propellers, this invention will cost 32,755 yuan in the first year after deducting the renovation cost of 1,500 yuan.
From this table, it can be seen that the economic benefits and social benefits of the nine shaft sealing devices mentioned in this invention are significant, and at the same time water pollution is effectively prevented. You can know that. Note that this sealing device can also be used to seal rotating shafts of other machines.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of a sealing device according to the invention. FIG. 2 is a sectional view of a second embodiment of a sealing device according to the invention. FIG. 3 is a sectional view of a third embodiment of the sealing device according to the invention. FIG. 4 is a sectional view of a fourth embodiment of the sealing device according to the invention. FIG. 5 is a sectional view of a fifth embodiment of the sealing device according to the invention. FIG. 6 is a schematic diagram of an automatic circulation lubrication system according to the present invention. 0 6: Silent seal ring 7: Rotating seal ring 8: Rotating ring tray 9: Compression spring 10: Pressure spring tray
11: 0 type seal ring 12: Hollow plug 14.2
0: Stationary ring 15.19: Rotating ring 51: Circulation tank 53: Upper oil supply pipe 54: Flow meter 55: Cock 56% 57: Check valve 58: Upper oil return pipe

Claims (23)

[Claims] (1) A rotating shaft that has an elastic seal ring that performs both radial sealing and axial sealing, and a coil spring that is sleeve-connected to the rotating shaft and presses the sealing surface formed by the rotating seal ring and the stationary seal ring. In the sealing device, the elastic sealing ring is a rotating sealing ring with two parallel end faces, the axial distance between which is less than the difference between the outer radius of the sealing ring and the radius of the rotational axis, and the rotational axis The sleeves are connected with an interference on the top, one of the end faces is in contact with the stationary seal ring to form a tight axial sealing surface, and the other end face is such that the entire rotating seal ring is in contact with the stationary seal ring. a compression spring having an outer diameter smaller than the diameter of the rotary sealing ring, so as to form an adjustable self-tightening system in uniform contact with the rotary sealing ring, so that the sealing surface can compensate when it wears; A rotary shaft seal device, characterized in that it is pressed by a spring tray and a rotary seal ring tray. (2) The rotary shaft sealing device according to claim 1, wherein the distance between the two parallel end surfaces is about 15 to 30% of the diameter of the rotary shaft. (3) Claim 1 or 2 characterized in that an anti-wear agent is sprinkled on the end surfaces formed by the rotating seal ring and the stationary seal ring when they contact each other.
The rotary shaft sealing device described in . (4) at least one annular ring on the inner wall surface of the rotary seal ring to permit axial movement along the axis of the rotary seal ring and to enhance the radial seal between the rotary seal ring and the shaft; The rotating shaft seal device according to claim 1 or 2, characterized in that it has a groove. (5) the spring tray and the rotating seal ring tray fixed on the shaft each have a bead with at least one axial keyway, into which a corresponding key on the end face of the spring fits; The rotary shaft sealing device according to claim 1, wherein the spring is thereby rotated together with the rotation of the shaft. (6) A second bead extending in the opposite direction to the bead on the rotary seal ring tray is pressed against the outer periphery of the rotary seal ring so that the rotary seal ring reliably presses the shaft. A rotary shaft sealing device according to claim 5. (7) the rotary seal ring tray having an inner conical surface and coupled to the rotary seal ring such that the rotary seal ring tray axially presses the rotary seal ring and at the same time the rotary seal ring clips the shaft radially; A rotary shaft sealing device according to claim 1, characterized in that: (8) a tray of the rotating seal ring, a compression spring, and the tray is sleeve-connected to the rotating shaft, and a fixed support flange with an adjuster is provided on the shaft end adjacent to the compression spring tray, between the rotating seal ring and the stationary seal ring; 2. The rotary shaft sealing device according to claim 1, wherein the specific pressure of the friction surface can be adjusted by a regulator. (9) The stationary seal ring is fixed on the shaft sleeve by at least two adjustment bolts, and the adjustment bolts are used to adjust the specific pressure of the friction surface between the stationary seal ring and the rotating seal ring. A rotary shaft sealing device according to claim 1, characterized in that: (10) The rotary shaft sealing device according to claim 9, wherein a wear-resistant material is fitted onto the end face between the stationary seal ring and the rotating seal ring. (11) The rotary shaft sealing device according to claim 1, characterized in that there is a preliminary seal ring outside the stationary seal ring to enhance the sealing and limiting effect. (12) The rotary shaft sealing device according to claim 1, wherein there is at least one spiral groove as a lubricant passage on the inner surface of the bearing of the rotary shaft. (13) The rotary shaft sealing device according to claim 9, wherein the stationary seal ring is of an integral piece type. (14) The rotary shaft sealing device according to claim 9, wherein the end cover of the stationary seal ring is removable. (15) The rotary shaft sealing device according to claim 9, wherein the stationary seal ring has a half ring shape. (16) The rotary shaft sealing device according to claim 1, wherein at least one set of the sealing devices is attached to a sealing end of the shaft. (17) The rotary shaft sealing device according to claim 1, wherein the pressure on the seal end face can be controlled by adjusting the axial displacement of the shaft. (18) An automatic circulation lubrication system used in the above-mentioned rotary shaft sealing device, which includes a circulation lubricant tank, an oil supply pipe, an oil return pipe, and a check valve, and which does not require a circulation oil pump or circulation. The automatic circulation lubrication system described above is characterized in that an automatic circulation circuit is formed by a pipe, an oil return pipe, and a rotary shaft sealing device. (19) There is an altitude difference between the inlet of the oil supply pipe and the bottom of the circulating oil tank, a filter is also fitted, and there is also an altitude difference between the inlet of the oil return pipe and the bottom of the circulating oil tank. An automatic circulation lubrication system as claimed in claim 18. (20) Claim 18, characterized in that the oil supply pipe is connected to the seal chamber of the rotary shaft sealing device via a stationary seal ring located at the end of the shaft.
Automatic circulation lubrication system as described in Section. (21) The automatic circulation lubrication system according to claim 18, wherein the oil return pipe is connected to the oil supply passage through a spiral groove of the bearing. (22) A transparent pipe with a cock is provided above the reversal valve of the oil supply pipe to measure the amount of leakage, and the top of this measuring pipe is located at a position higher than the highest oil level in the circulating oil tank. An automatic circulation lubrication system according to claim 18. (23) The circulating oil tank is movable, and by adjusting the height of the circulating oil tank and adjusting the back pressure of the elastic seal ring, the specific pressure of the friction surface between the elastic seal ring and the stationary seal ring is adjusted. Automatic circulation lubrication system according to claim 18, characterized in that it is possible.