Multiple radial sealing isolation device

Abstract

The utility model provides a multiple radial sealing isolation device, which comprises a static ring and a moving ring, the static ring comprises a static connecting ring, a static inner sealing ring and a static outer sealing ring, the static connecting ring is connected with the moving ring along the radial direction, and the static inner sealing ring and the static outer sealing ring are arranged along the axial direction. At least one annular sealing filler groove is formed in the inner circular surface of the static inner sealing ring, and the sealing filler is filled in the sealing filler groove and seals the rotating shaft; the movable ring comprises a movable supporting ring arranged in the radial direction, a movable inner sealing ring and a movable outer sealing ring, the movable supporting ring is connected with the movable supporting ring, the movable inner sealing ring and the movable outer sealing ring are arranged in the axial direction, the rotary shaft is fixedly sleeved with the movable inner sealing ring, and the movable outer sealing ring is inserted between the static inner sealing ring and the static outer sealing ring. The outer circle face of the static inner sealing ring and the inner circle face of the static outer sealing ring are each provided with at least one sealing lip with the splayed section, and the sealing lips and the movable outer sealing ring are in tight contact and sealed. The device is good in sealing effect, long in service life and good in anti-deflection effect.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a multiple radial seal isolation device. Background Art

[0002] Mechanical seals are devices that prevent fluid leakage in equipment. Contact seals and labyrinth seals are the two main forms of mechanical seals. Labyrinth seals are a series of annular seal teeth arranged in sequence around the rotating shaft. A series of interception gaps and expansion cavities are formed between the teeth. When the sealed medium passes through the gaps of the tortuous labyrinth, a throttling effect is produced to achieve the purpose of preventing leakage. Since there is a gap between the rotor and the casing of the labyrinth seal, there is no solid contact, and thermal expansion is allowed, it is suitable for high temperature, high pressure, high speed and frequency occasions. This type of seal is widely used in steam turbines, gas turbines, compressors, blowers, shaft ends and sealing between stages. However, for some occasions with high sealing performance requirements, contact seals are usually used to seal the rotating shaft. The leakage rate of the sealed medium in the contact seal is very low, ensuring zero leakage of the fluid in the sealing chamber, and also preventing external pollutants from entering the sealing chamber.

[0003] In addition to high requirements for sealing performance, there are also high requirements for the service life of the sealing device. At present, there are many kinds of sealing device products in this field, with complex or simple structures, and different sealing performance and service life. But in general, it is still a common expectation of technicians in this field to provide a sealing device with good sealing performance and long service life. Utility Model Content

[0004] The utility model provides a multiple radial sealing isolation device, which can seal the gap between the rotating shaft and the device housing to avoid leakage of the fluid in the device housing, has good sealing effect, long service life and good anti-deflection effect.

[0005] The technical solution used to achieve the above-mentioned purpose of the utility model is:

[0006] A multiple radial sealing isolation device is installed between a rotating shaft and a device housing, wherein the rotating shaft passes through the device housing and rotates relative to the device housing, and the multiple radial sealing isolation device comprises:

[0007] The stationary ring comprises a stationary connecting ring arranged in the radial direction and a stationary inner sealing ring and a stationary outer sealing ring arranged in the axial direction, wherein the stationary connecting ring is fixed against the equipment housing, the stationary inner sealing ring is located between the rotating shaft and the stationary outer sealing ring, and at least one annular sealing filler groove is arranged on the inner circumferential surface of the stationary inner sealing ring, and the sealing filler is filled in the sealing filler groove and seals the rotating shaft;

[0008] The dynamic ring is located on the side of the static ring away from the equipment housing. The dynamic ring includes a dynamic support ring arranged radially and a dynamic inner sealing ring and a dynamic outer sealing ring arranged axially, wherein the dynamic inner sealing ring is fixedly sleeved on the rotating shaft so that the dynamic ring as a whole rotates with the rotating shaft, and the dynamic outer sealing ring is inserted between the static inner sealing ring and the static outer sealing ring to form a tortuous sealing cavity; at least one sealing lip with an "eight"-shaped cross-section is arranged on the outer circumferential surface of the static inner sealing ring and the inner circumferential surface of the static outer sealing ring, and the sealing lips are in close contact and sealing with the dynamic outer sealing ring.

[0009] The multiple radial sealing isolation device is a full-circle structure or a split structure.

[0010] An annular first mounting groove is provided on the outer circumferential surface of the static inner sealing ring and the inner circumferential surface of the static outer sealing ring. An annular sealing strip is embedded in the first mounting groove. The sealing strip is integrally connected with the sealing lip to form a Y-shaped sealing ring with a "Y"-shaped cross-section.

[0011] An annular oil storage groove is arranged between one side of the Y-shaped sealing ring close to the bottom of the first mounting groove and the static inner sealing ring or the static outer sealing ring; the static outer sealing ring is provided with oil filling holes connecting the oil storage groove on the static outer sealing ring with the outside world, and the static inner sealing ring is also provided with oil filling holes connecting the oil storage groove on the static inner sealing ring with the sealing cavity.

[0012] The static inner sealing ring is provided with an oil injection channel along the axial direction, the oil injection channel is communicated with the sealing cavity, and the oil injection holes distributed on the static inner sealing ring are all communicated with the oil storage tank and the oil injection channel.

[0013] The static outer sealing ring is provided with oil injection holes which connect the outside with the sealing cavity.

[0014] An oil storage groove is arranged between one side of the sealing packing close to the bottom of the sealing packing groove and the static inner sealing ring, and oil injection holes connecting the oil storage groove on the static inner sealing ring and the sealing cavity are distributed on the static inner sealing ring.

[0015] A gland in the shape of an annular ring is fixedly attached to the side of the static inner sealing ring away from the equipment housing, and the inner ring of the gland extends to be pressed tightly against the side of the sealing packing.

[0016] The inner circumferential surface of the dynamic inner sealing ring is provided with more than one annular second installation grooves, each of which is provided with a sealing ring, which is tightly sleeved on the rotating shaft.

[0017] A locking ring is installed on the outer circumferential surface of the dynamic inner sealing ring to lock the dynamic inner sealing ring on the rotating shaft.

[0018] Compared with the prior art, the sealing device provided by the utility model has the following advantages: 1. The multiple radial sealing isolation device provided in the utility model can seal the gap between the rotating shaft and the equipment housing, and perform multiple radial contact sealing on the sealing cavity through sealing fillers, sealing rings and Y-type sealing rings, with good sealing effect, effectively preventing leakage of fluid in the equipment housing.

[0019] 2. In the utility model, the sealing packing and the Y-type sealing ring are provided with oil storage tanks, and the static ring is provided with oil injection holes and oil injection channels which are connected with the outside, the sealing cavity and the oil storage tank. Lubricating grease can be injected into the device to lubricate the sealing packing and the Y-type sealing ring, reduce friction and wear, fill tiny gaps, improve sealing performance, slow down the aging of the Y-type sealing ring and the sealing packing, and prolong the service life of the device.

[0020] 3. In the utility model, the outer ring of the static connecting ring is fixed against the equipment housing, the inner ring of the static connecting ring is pressed against the outer sides of the static inner sealing ring and the sealing packing by a gland, and the dynamic inner sealing ring is locked by a locking piece. The whole device is firmly connected and has a good anti-swaying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the multiple radial sealing isolation device provided by the utility model;

[0022] In the figure: 1-equipment housing, 2-rotating shaft, 3-static connecting ring, 4-static inner sealing ring, 5-static outer sealing ring, 6-connecting bolts, 7-sealing packing, 8-pressure cover, 9-dynamic support ring, 10-dynamic inner sealing ring, 11-dynamic outer sealing ring, 12-sealing ring, 13-locking ring, 14-sealing chamber, 15-Y-type sealing ring, 16-oil storage tank, 17-oil filling hole, 18-oil filling channel. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following embodiments.

[0024] The structure of the multiple radial sealing isolation device provided in this embodiment is as follows: Figure 1 As shown, it is installed between the rotating shaft 2 and the equipment housing 1. The rotating shaft passes through the equipment housing and rotates relative to the equipment housing. The multiple radial sealing isolation devices seal the gap between the rotating shaft and the equipment housing to prevent the fluid in the equipment housing from flowing out of the gap.

[0025] In this embodiment, the multiple radial sealing isolation device includes a stationary ring and a dynamic ring.

[0026] The static ring includes a static connecting ring 3 arranged radially and a static inner sealing ring 4 and a static outer sealing ring 5 arranged axially. The static connecting ring is fixed against the device housing, and the static inner sealing ring is located between the rotating shaft and the static outer sealing ring. Specifically, the static connecting ring and the device housing are connected and fixed by connecting bolts 6. In order to facilitate the connection and installation between the static connecting ring and the device housing, in this embodiment, the static outer sealing ring is located at a position close to the outer cylindrical surface of the static connecting ring, so that a fixed step is formed on the outer cylindrical ring of the static connecting ring, and bolt holes are opened on the fixed step to connect with the device housing. The bolt holes are opened on the outside of the entire sealing isolation device to facilitate installation and fixation.

[0027] At least one annular sealing packing groove is provided on the inner circumference of the static inner sealing ring, and the sealing packing 7 is filled in the sealing packing groove and seals the rotating shaft. It should be noted that the sealing packing grooves can be connected or disconnected. In this embodiment, three sealing packing grooves are provided, and the three sealing packing grooves are connected. Since the equipment housing and the entire static ring are only connected and fixed by the connecting bolts on the outer circumference of the static connecting ring, when the rotating shaft rotates, the inner circumference of the static connecting ring will swing with the rotating shaft, which may cause the sealing packing to fail and also aggravate the wear of the sealing packing. Therefore, in this embodiment, a pressure cap 8 in the shape of an entire annular ring is fixed on the side of the static inner sealing ring away from the equipment housing, and the inner circumference of the pressure cap extends to press against the side of the sealing packing. Specifically, the pressure cap and the equipment housing are also connected and fixed by connecting bolts, that is, the connecting bolts pass through the pressure cap, the static inner sealing ring, the static connecting ring and the equipment housing to lock and fix, so that the entire static ring is pressed on the inner circumference of the entire static ring, the anti-swaying performance is good, and the wear of the sealing packing is reduced. Preferably, the static inner sealing ring is located near the inner circumferential surface of the static connecting ring, so that a sealing packing groove is formed between the static connecting ring, the static inner sealing ring and the gland, and then the sealing packing is filled in the sealing packing groove. When installing the static ring, the sealing packing can be filled in the sealing packing groove first, and then the sealing packing is pressed on the rotating shaft, and then the sealing packing and the static inner sealing ring are pressed from one side through the gland, and then the connecting bolts between the static connecting ring and the equipment housing are installed.

[0028] The dynamic ring is located on the side of the static ring away from the equipment housing. The dynamic ring includes a dynamic support ring 9 arranged radially and a dynamic inner sealing ring 10 and a dynamic outer sealing ring 11 arranged axially. The dynamic inner sealing ring is fixedly sleeved on the rotating shaft so that the dynamic ring as a whole rotates with the rotating shaft. In this embodiment, more than one annular second mounting grooves are distributed on the inner circumference of the dynamic inner sealing ring, and a sealing ring 12 is installed in each of the second mounting grooves, and the sealing ring is pressed on the rotating shaft. In order to ensure the installation stability of the entire dynamic ring, a locking ring 13 is installed on the outer circumference of the dynamic inner sealing ring to lock the dynamic inner sealing ring on the rotating shaft. Specifically, a locking groove is provided on the outer circumference of the dynamic inner sealing ring, and the locking ring is installed in the locking groove to lock the dynamic inner sealing ring. The locking ring can be an annular locking member such as a clamp and a buckle.

[0029] In this embodiment, the dynamic outer sealing ring is inserted between the static inner sealing ring and the static outer sealing ring, thereby forming a tortuous sealing cavity 14. At least one sealing lip with an "eight"-shaped cross section is provided on the outer circumferential surface of the static inner sealing ring and the inner circumferential surface of the static outer sealing ring, and the sealing lips are in close contact and sealing with the dynamic outer sealing ring. Specifically, a first annular mounting groove is provided on the outer circumferential surface of the static inner sealing ring and the inner circumferential surface of the static outer sealing ring, and an annular sealing strip is embedded in the first mounting groove. The number and position of the sealing strip match the sealing lip, and the sealing strip and the sealing lip are integrally connected to form a Y-shaped cross section Y-shaped Y-shaped sealing ring 15. That is, the sealing lip is separately connected to the static inner sealing ring and the static outer sealing ring. In actual setting, the static ring as a whole can be made of a metal material with good deformation resistance, and the Y-shaped sealing ring is made of an elastic rubber material, which can ensure the anti-swaying property of the entire device and the sealing effect of the contact seal, thereby improving the service life of the entire device.

[0030] Preferably, an annular oil storage groove 16 is provided between one side of the Y-shaped sealing ring close to the bottom of the first mounting groove and the static inner sealing ring or the static outer sealing ring, and an oil storage groove is also provided between one side of the sealing packing close to the bottom of the sealing packing groove and the static inner sealing ring. Specifically, the oil storage groove can be provided on the static inner sealing ring or the static outer sealing ring, or on the Y-shaped sealing ring or the sealing packing. In this embodiment, the oil storage groove between the Y-shaped sealing ring and the static inner sealing ring or the static outer sealing ring is provided on the Y-shaped sealing ring, and the oil storage groove between the sealing packing and the static inner sealing ring is provided on the sealing packing, see Figure 1 .

[0031] In this embodiment, the static outer sealing ring is provided with oil injection holes 17 connecting the outside world with the sealing cavity, the static outer sealing ring is also provided with oil injection holes connecting the oil storage groove on the static outer sealing ring with the outside world, and the static inner sealing ring is also provided with oil injection holes connecting the oil storage groove on the static inner sealing ring (including the oil storage groove at the Y-shaped sealing ring and the sealing packing) with the sealing cavity. Furthermore, an oil injection channel 18 is axially provided on the static inner sealing ring, and the oil injection channel is connected with the sealing cavity. The oil injection holes distributed on the static inner sealing ring are all connected with the oil storage groove and the oil injection channel, so that the oil storage groove on the static inner sealing ring is all connected with the sealing cavity. The lubricating grease is injected into the sealing cavity and the oil storage groove of the static outer sealing ring through the oil injection holes connected with the outside world, and the lubricating grease then flows from the sealing cavity into the oil storage groove of the static inner sealing ring, thereby lubricating the Y-shaped sealing ring and the sealing packing, reducing friction and wear, filling small gaps, improving sealing performance, and slowing down the aging of the Y-shaped sealing ring and the sealing packing.

[0032] In actual configuration, the multiple radial sealing isolation device can be configured as a full ring structure or a split structure as required, that is, each component in the multiple radial sealing isolation device can be either a full ring structure or an arc structure split into multiple sections.

Claims

1. A multiple radial sealing isolation device, installed between a rotating shaft and a device housing, wherein the rotating shaft passes through the device housing and rotates relative to the device housing, characterized in that: The multiple radial sealing isolation device comprises: The stationary ring comprises a stationary connecting ring arranged in the radial direction and a stationary inner sealing ring and a stationary outer sealing ring arranged in the axial direction, wherein the stationary connecting ring is fixed against the equipment housing, the stationary inner sealing ring is located between the rotating shaft and the stationary outer sealing ring, and at least one annular sealing filler groove is arranged on the inner circumferential surface of the stationary inner sealing ring, and the sealing filler is filled in the sealing filler groove and seals the rotating shaft; The dynamic ring is located on the side of the static ring away from the equipment housing. The dynamic ring includes a dynamic support ring arranged radially and a dynamic inner sealing ring and a dynamic outer sealing ring arranged axially, wherein the dynamic inner sealing ring is fixedly sleeved on the rotating shaft so that the dynamic ring as a whole rotates with the rotating shaft, and the dynamic outer sealing ring is inserted between the static inner sealing ring and the static outer sealing ring to form a tortuous sealing cavity; at least one sealing lip with an "eight"-shaped cross-section is arranged on the outer circumferential surface of the static inner sealing ring and the inner circumferential surface of the static outer sealing ring, and the sealing lips are in close contact and sealing with the dynamic outer sealing ring.

2. The multiple radial sealing isolation device according to claim 1, characterized in that: The multiple radial sealing isolation device is a full-circle structure or a split structure.

3. The multiple radial sealing isolation device according to claim 1, characterized in that: An annular first mounting groove is provided on the outer circumferential surface of the static inner sealing ring and the inner circumferential surface of the static outer sealing ring, and an annular sealing strip is embedded in the first mounting groove. The sealing strip and the sealing lip are integrally connected to form a Y-shaped sealing ring with a "Y"-shaped cross-section.

4. The multiple radial sealing isolation device according to claim 3, characterized in that: An annular oil storage groove is arranged between one side of the Y-shaped sealing ring close to the bottom of the first mounting groove and the static inner sealing ring or the static outer sealing ring; the static outer sealing ring is provided with oil filling holes connecting the oil storage groove on the static outer sealing ring with the outside world, and the static inner sealing ring is also provided with oil filling holes connecting the oil storage groove on the static inner sealing ring with the sealing cavity.

5. The multiple radial sealing isolation device according to claim 4, characterized in that: The static inner sealing ring is provided with an oil injection channel along the axial direction, the oil injection channel is communicated with the sealing cavity, and the oil injection holes distributed on the static inner sealing ring are all communicated with the oil storage tank and the oil injection channel.

6. The multiple radial sealing isolation device according to claim 1, characterized in that: The static outer sealing ring is provided with oil injection holes which connect the outside with the sealing cavity.

7. The multiple radial sealing isolation device according to claim 1, characterized in that: An oil storage groove is arranged between one side of the sealing packing close to the bottom of the sealing packing groove and the static inner sealing ring, and oil injection holes connecting the oil storage groove on the static inner sealing ring and the sealing cavity are distributed on the static inner sealing ring.

8. The multiple radial sealing isolation device according to claim 1, characterized in that: A gland in the shape of an annular ring is fixedly attached to the side of the static inner sealing ring away from the equipment housing, and the inner ring of the gland extends to be pressed tightly against the side of the sealing packing.

9. The multiple radial sealing isolation device according to claim 1, characterized in that: The inner circumferential surface of the dynamic inner sealing ring is provided with more than one annular second installation grooves, each of which is provided with a sealing ring, which is tightly sleeved on the rotating shaft.

10. The multiple radial sealing isolation device according to claim 1, characterized in that: A locking ring is installed on the outer circumferential surface of the dynamic inner sealing ring to lock the dynamic inner sealing ring on the rotating shaft.

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