CN203500099U - Low-pressure rotary shaft sealing device - Google Patents

Abstract

The utility model discloses a low-pressure rotating shaft sealing device, which comprises a sealing chamber, an oil seal sleeve and a gland arranged at one end of the sealing chamber. The oil seal sleeve is installed in the sealing chamber, and an oil injection hole is arranged on the sealing chamber. An oil cup is arranged at the hole, and several Y-shaped oil seals and oil separator rings are arranged in the oil seal sleeve, and the Y-shaped oil seals and oil separator rings are alternately arranged in the oil seal sleeve, and the Y-shaped oil seal is a radial thrust Elastic structure, the oil seal sleeve has uniform openings and faces the oil distribution ring, the grease entering from the oil injection hole can enter the oil seal evenly through the oil distribution ring, and the gland, oil seal sleeve and sealing cavity pass through the bolts connect. The sealing device is used in low-pressure working conditions, which can effectively ensure that it can achieve a long period of no-leakage or micro-leakage sealing effect within the service life. It can realize maintenance-free or only simple maintenance under suitable working conditions.

Description

A low-pressure rotating shaft sealing device

technical field

The utility model belongs to the technical field of sealing and relates to a low-pressure rotating shaft sealing device.

Background technique

In industrial production, the conventional liquid media transported by centrifugal pumps are mostly short-to-medium distance and low-lift processes, and are used for low-pressure transport conditions. At present, for the shaft seals of centrifugal pumps in such processes, three types of sealing methods, such as traditional packing seals, mechanical seals, and dynamic seals + packing (mechanical seals), are used to control the leakage of dynamic seals.

Among the three types of sealing methods, the packing seal is an axial dynamic sealing structure that saves investment. However, due to the large frictional power loss caused by the specific pressure of the axial end face, it needs frequent adjustment and maintenance, forced cooling and flushing. It can achieve the effect of micro-leakage, and the service life of the packing is short, which is easy to cause wear on the shaft diameter of the seal, and the old packing after damage is not easy to dispose of. The mechanical seal is a radial dynamic seal structure with relatively expensive investment. It has low friction power loss, good sealing performance, and can achieve no leakage effect. Although it has a wide adaptability to various working conditions, due to its high manufacturing precision and high price, it requires high assembly technology difficulty during maintenance, daily maintenance and operation are required, and forced washing and cooling are required to operate. The dynamic seal is a mobile sealing device that relies on the rotation of the rotor to drive the fluid to generate centrifugal force, which creates a negative pressure at the end of the shaft to overcome leakage. When it is running, it can achieve zero leakage, no wear and long life. But its disadvantage is that the power consumption is large, and it must be supplemented with a parking seal.

These three types of shaft seal methods are actually artificially adjusted by adjusting the specific pressure of the axial or radial end face to judge whether the control function and effect of the shaft seal can be effectively achieved. If the specific pressure of the end face is small, the life of the seal can be extended, but it is prone to leakage; if the specific pressure of the end face is large, the sealing effect is good, but the seal is easy to wear and the service life is short. Therefore, people's skills, sense of responsibility and work experience largely affect its operating life and sealing effect.

Utility model content

In order to solve the above problems, the utility model provides a low-pressure rotating shaft sealing device for the actual situation in which the pressure of the sealing chamber is lower than 0.2 MPa in the application occasions of industrial centrifugal pumps, so as to achieve good sealing and low power consumption , low cost, maintenance free and energy saving and environmental protection.

The utility model is realized through the following technical solutions.

A low-pressure rotary shaft sealing device, comprising a sealing chamber, an oil seal sleeve and a gland arranged at one end of the sealing chamber, the oil seal sleeve is installed inside the sealing chamber, an oil injection hole is arranged on the sealing chamber, and an oil injection hole is arranged at the oil injection hole The cup is characterized in that several Y-shaped oil seals and oil separator rings are arranged in the oil seal sleeve, and the Y-shaped oil seals and oil separator rings are alternately arranged in the oil seal sleeve.

The Y-shaped oil seal is an elastic structure with radial thrust.

The processing shape of the oil seal sleeve is I-shaped.

There are even holes on the oil seal sleeve.

The sealing cavity, the oil seal sleeve and the gland are connected by bolts.

The beneficial effects of the utility model are:

Compared with the prior art, the utility model mainly uses the Y-type fluororubber oil seal lip to form a line contact with the radial adhesion force of the journal with higher smoothness for sealing, and through multiple radial force elastic structures The series combination of Y-type oil seals can achieve the effect of no leakage or slight leakage during the normal service life of the seals, which can effectively improve the production efficiency of the equipment. During the parking and operation of the sealing device, the adhesion of the oil seal lip can be automatically adjusted according to the degree of pressure. Increase or decrease occurs to achieve the purpose of decompressing and blocking the medium step by step, and maintains a suitable end face specific pressure, low friction power, low heat energy, no need for additional cooling and flushing, and achieves a good energy-saving effect. Seals are worn and replaced It is easy to recycle and dispose afterward, will not cause secondary pollution to the environment, and achieves a good environmental protection effect. Moreover, the utility model has the characteristics of simple structure, low manufacturing cost, easy assembly, and easy maintenance.

Description of drawings

Fig. 1 is the structural representation of the utility model;

In the figure: 1-seal cavity, 2-oil injection hole, 3-oil seal sleeve, 4-oil separator ring, 5-Y type oil seal, 6-oil cup, 7-gland, 8-pump shaft, 9-pump body end .

Detailed ways

The technical solution of the utility model is further described below in conjunction with the accompanying drawings, but the scope of protection is not limited to the description.

As shown in Figure 1, a low-pressure rotating shaft seal described in the present invention includes a sealing chamber 1, an oil seal sleeve 3 and a gland 7 arranged at one end of the sealing chamber 1, the oil seal sleeve 3 is installed inside the sealing chamber 1, The sealing chamber 1 is provided with an oil injection hole 2, and a lubricant screw cap type oil cup 6 is arranged at the oil injection hole 2, and lubricating grease is regularly injected from the oil injection hole 2.

There are uniform openings on the oil seal cover 3, and there are 3 to 6 Y-shaped oil seals 5 inside the oil seal cover 3, and an oil distribution ring 4 is arranged in the middle of every two Y-shaped oil seals 5, and the position of the oil distribution ring 4 is consistent with that during installation. The opening on the oil seal sleeve 3 is facing directly, and the grease entering from the oil injection hole 2 can be evenly distributed to the inside of the sealing chamber 1 through the oil separator ring 4 to achieve the effect of lubrication and cooling. No additional cooling method is required, and it can also assist the sealing chamber. Blocking, greatly reducing the cost of use.

The oil seal sleeve 3 is processed into an I-shape and embedded in the sealing chamber 1. The outer flange of the oil seal sleeve 3 cooperates with the inner wall of the sealing chamber, and a part of the cavity is formed between the middle section and the sealing chamber 1 to ensure a larger lubricant storage space. .

The lip of the Y-shaped oil seal 5 is close to the surface of the pump shaft 8, and the Y-shaped oil seal 5 is a Y-shaped fluororubber oil seal, which is an elastic structure with radial thrust, and a plurality of Y-shaped oil seals 5 are connected in series in the oil seal sleeve 3 Combination, when installing, the first oil seal at the pump body end is installed facing away from the pump body end, and the second to last ones are all installed facing the pump body end, which can better seal the lubricant in the sealing chamber 1, and the axial direction and The transmission medium is isolated to achieve a good sealing effect. Even if the seal is slightly worn, it will be supplemented by the elastic structure of the Y-shaped oil seal 5, keeping the line contact between the lip of the oil seal and the surface of the pump shaft 8, so that leakage is not easy to occur, and the Frequent maintenance is required.

The gland 7, the oil seal sleeve 3 and the sealing cavity 1 are connected by bolts, and the axial movement of the Y-shaped oil seal 5 in the sealing cavity is restricted by the gland 7.

The sealing structure was tested and observed in many different working conditions, such as horizontal sludge pump, clean water pump, double-suction circulating water pump, dilute phosphoric acid transfer pump, sewage pump, etc. The working condition of the liquid medium pressure in the sealing chamber is below 0.2MPa Among the conditions, the medium solid content is below 10%, the sealing effect is very outstanding, and there is very little maintenance. Especially in the power seal horizontal pumps, back suction horizontal pumps and double suction pumps that meet the working conditions, this device has an excellent effect as a parking seal.

Claims (5)

1. a low pressure shaft sealing device, comprise Seal cage (1), oil-sealing sleeve (3) and be arranged at the gland (7) of Seal cage (1) one end, described oil-sealing sleeve (3) is arranged on Seal cage (1) inside, on described Seal cage (1), be provided with oil hole (2), at oil hole (2), locate to be provided with lubricating cup (6), it is characterized in that: in described oil-sealing sleeve (3), be provided with some Y type oil sealings (5) and oil distributing ring (4), described Y type oil sealing (5) and oil distributing ring (4) are alternately arranged in oil-sealing sleeve (3).

2. a kind of low pressure shaft sealing device according to claim 1, is characterized in that: described Y type oil sealing (5) is for having the elastic structure of radial thrust.

3. a kind of low pressure shaft sealing device according to claim 1, is characterized in that: described oil-sealing sleeve (3) processing profile is I-shaped.

4. a kind of low pressure shaft sealing device according to claim 3, is characterized in that: described oil-sealing sleeve has even perforate on (3).

5. a kind of low pressure shaft sealing device according to claim 1, is characterized in that: described Seal cage (1), oil-sealing sleeve (3) and gland (7) are bolted.

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