CN213929450U

CN213929450U - Half-split shaft end mechanical sealing device

Info

Publication number: CN213929450U
Application number: CN202022510893.8U
Authority: CN
Inventors: 童慧; 赵佳佳; 童小明; 宋燕; 马佳梁; 童汉全
Original assignee: Jiangsu Bolio Fluid Machinery Co ltd
Current assignee: Jiangsu Bolio Fluid Machinery Co ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-08-10
Anticipated expiration: 2030-11-03

Abstract

The utility model discloses a semi-split type shaft end mechanical sealing device, which comprises a shaft sleeve and a split type gland, wherein a pneumatic sealing cavity and a mechanical sealing cavity are arranged on the inner circumferential surface of the split type gland, a pneumatic sealing lining ring is fixedly arranged on the inner circumferential surface of the pneumatic sealing cavity, and an annular inflatable body is coated outside the pneumatic sealing lining ring; the mechanical sealing cavity is internally provided with a spring seat and a split type static ring, a first sealing ring is arranged between the spring seat and the shaft sleeve, a movable ring seat which can only axially move relative to the spring seat and cannot rotate relative to the spring seat is arranged outside the spring seat, a second sealing ring is arranged between the movable ring seat and the spring seat, the split type movable ring facing the split type static ring is embedded on the movable ring seat, a third sealing ring is arranged between the split type movable ring and the movable ring seat, and a spring is arranged between the movable ring seat and the spring seat. The utility model has the advantages of convenient disassembly and assembly.

Description

Half-split shaft end mechanical sealing device

Technical Field

The utility model relates to a shaft end sealing technical field, concretely relates to half-section formula shaft end mechanical seal device.

Background

The pump, the reaction kettle and other devices are important equipment in petrochemical industry and other industries, and are one of the main production devices of the whole chemical process flow. The shaft seal device is one of the most frequent parts of the whole process flow which can break down; the shaft seal device is also provided with a bearing, a reducer, a motor and other end fittings. Once the shaft seal device breaks down and needs to be overhauled, shaft end fittings such as a bearing, a speed reducer, a motor and the like above the shaft seal device must be firstly dismantled, so that the disassembly is very troublesome, the maintenance period is long, and the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a convenient half subdivision formula axle head mechanical seal device is changed in dismouting.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the semi-split type shaft end mechanical sealing device comprises a shaft sleeve fixedly sleeved at a shaft end, a split type gland fixed with an equipment shell is sleeved outside the shaft sleeve, a pneumatic sealing cavity and a mechanical sealing cavity are sequentially arranged on the inner circumferential surface of the split type gland from the equipment side to the atmosphere side along the axial direction at intervals, a pneumatic sealing lining ring is fixedly installed on the inner circumferential surface of the pneumatic sealing cavity, an annular inflatable body in contact and sealing with the inner wall of the pneumatic sealing cavity is coated outside the pneumatic sealing lining ring, the annular inflatable body is communicated with an external air source through an air passage, and when the external air source introduces air into the annular inflatable body through the air passage, the annular inflatable body can be expanded inwards and radially to be in sealing contact with the outer circumferential surface of the shaft sleeve, so that a gap between the split type gland and the shaft sleeve is sealed; a spring seat and a split type static ring are sequentially arranged in the mechanical seal cavity along the axial direction from the equipment side to the atmosphere side at intervals, the split type static ring is fixed with a split type gland, the spring seat is fixedly sleeved on a shaft sleeve, a first sealing ring for sealing a gap between the spring seat and the shaft sleeve is arranged between the spring seat and the shaft sleeve, a moving ring seat which can only axially move relative to the spring seat and cannot rotate relative to the spring seat is arranged outside the spring seat, a second sealing ring for contacting and sealing the gap between the moving ring seat and the spring seat is arranged between the moving ring seat and the spring seat, a split type moving ring facing the split type static ring is embedded on the moving ring seat, a third sealing ring for sealing the gap between the split type moving ring and the moving ring seat is arranged between the split type moving ring seat and the moving ring seat, and a spring is arranged between the moving ring seat and the spring seat, and under the combined action of the elasticity of the spring and the internal pressure of the equipment side, the moving ring seat can always axially move towards the large gas side relative to the split type moving ring to be rotatably sealed and jointed with the split type moving ring in a rotary way And (4) a stationary ring.

Further, the aforementioned half-split shaft end mechanical sealing device, wherein: the concrete structure of gas circuit includes: the pneumatic sealing lining ring is characterized in that a circle of annular groove is formed in the outer peripheral surface of the pneumatic sealing lining ring in sealing contact with the inner peripheral surface of the pneumatic sealing cavity, a plurality of air holes which radially penetrate through the pneumatic sealing lining ring are formed in the bottom of the annular groove along the circumferential direction, an air passage for communicating an external air source with the annular groove is formed in the split type gland, and the air passage, the annular groove and the air holes form an air passage which enables the air of the external air source to be introduced into the annular inflatable body.

Further, the aforementioned half-split shaft end mechanical sealing device, wherein: the split gland is provided with a flushing port for communicating a flushing liquid outlet of the flushing device with the interior of the mechanical seal cavity.

Further, the aforementioned half-split shaft end mechanical sealing device, wherein: concrete connection structure between spring holder and the rotating ring seat includes: the end face of the spring seat opposite to the moving ring seat is circumferentially provided with a plurality of axial guide holes, the end face of the moving ring seat opposite to the spring seat is circumferentially provided with a plurality of guide pins protruding out of the end face of the moving ring seat, the guide pins of the moving ring seat are in one-to-one correspondence with the axial guide holes of the spring seat, and each guide pin is inserted into the corresponding axial guide hole, so that the moving ring seat can only axially move relative to the spring seat and cannot rotate relative to the spring seat.

Further, the aforementioned half-split shaft end mechanical sealing device, wherein: the end face of the spring seat opposite to the movable ring seat is provided with a spring positioning groove for positioning and placing a spring.

Further, the aforementioned half-split shaft end mechanical sealing device, wherein: the end faces of two axial sides of the split type static ring are both wear-resistant sealing faces.

Further, the aforementioned half-split shaft end mechanical sealing device, wherein: concrete connection structure between subdivision formula stationary ring and the subdivision formula gland includes: the mechanical seal cavity inner wall in the split gland is provided with a circle of stationary ring positioning groove, the peripheral surface of the split stationary ring is provided with a circle of positioning bulge just embedded into the stationary ring positioning groove, the split stationary ring is embedded on the mechanical seal cavity inner wall of the split gland by inserting the positioning bulge into the stationary ring positioning groove, and a fourth sealing ring for a gap between the split stationary ring and the split gland is arranged between the positioning bulge and the stationary ring positioning groove inner wall.

Further, the aforementioned half-split shaft end mechanical sealing device, wherein: and a fluid leakage port for communicating a gap between the split stationary ring and the shaft sleeve is arranged on the split gland.

Through the implementation of the above technical scheme, the beneficial effects of the utility model are that: (1) under the combined action of the elasticity of the spring and the internal pressure of the equipment side, the movable ring seat can axially move to the atmosphere side relative to the spring seat all the time until the split movable ring can rotatably seal and attach to the split static ring; effective mechanical sealing of the shaft end is realized through the common matching of the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring, and the sealing performance is high; (2) the split gland, the partial movable ring and the split static ring in the shaft seal device are all in split structures, so that the shaft seal device is very convenient to disassemble and assemble, the shaft seal device is replaced under the condition of not disassembling all shaft end matching pieces above the shaft seal device, the maintenance period is greatly shortened, the maintenance cost is reduced, and the maintenance efficiency is improved; (3) through the design of the flushing port, the split type movable ring and the split type static ring are cooled on line in real time, and the running stability of the equipment is improved; (4) the split type stationary ring adopts a double-sided usable design, so that the use cost of equipment is reduced; (5) through the design of the inflatable body, when mechanical seal became invalid, let in the annular inflatable body with the gas of outside air supply, make the sealed contact shaft sleeve outer peripheral face of the inside radial expansion of annular inflatable body, sealed split gland and the clearance between the axle sleeve to effectively prevent the continuous leakage of fluid, improved the safety in utilization.

Drawings

Fig. 1 is a schematic structural view of a half-split shaft end mechanical sealing device of the present invention.

Fig. 2 is a schematic structural view of the split stationary ring shown in fig. 1.

Fig. 3 is an enlarged schematic view of a portion H shown in fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

As shown in fig. 1, 2 and 3, the semi-split mechanical shaft end sealing device comprises a shaft sleeve 2 fixedly sleeved on a shaft end 1, a split gland 3 fixed with an equipment shell is sleeved outside the shaft sleeve 2, a radial gap is left between the split gland 3 and the shaft sleeve 2, in fig. 1, the left side is an equipment side, the right side is an atmosphere side, pneumatic sealing cavities 4 and mechanical sealing cavities 5 are sequentially arranged on the inner circumferential surface of the split gland 3 along the axial direction from the equipment side to the atmosphere side at intervals, a pneumatic sealing lining ring 6 is fixedly installed on the inner circumferential surface of the pneumatic sealing cavity 4, an annular air expander 7 in contact sealing with the inner wall of the pneumatic sealing cavity 4 is covered outside the pneumatic sealing lining ring 6, the annular air expander 7 can be communicated with an external air source through an air passage, and when the external air source does not pass through the air passage to introduce air into the annular air expander 7, the annular air expander 7 is only in contact with the inner wall of the pneumatic sealing cavity 4 and seals, The annular air expansion body 7 can expand inwards and radially to be in sealing contact with the outer peripheral surface of the shaft sleeve 2 when an external air source introduces air into the annular air expansion body 7 through an air passage, so that a gap between the split gland 3 and the shaft sleeve 2 is sealed; a spring seat 8 and a split type static ring 9 are sequentially arranged in the mechanical seal cavity 5 at intervals from the equipment side to the atmosphere side along the axial direction, the split type static ring 9 is fixed with the split type gland 3, a radial gap is reserved between the split type static ring 9 and the shaft sleeve 2, the spring seat 8 is fixedly sleeved on the shaft sleeve 2 through a locking screw 10, a first seal ring 11 for sealing the gap between the spring seat 8 and the shaft sleeve 2 is arranged between the spring seat 8 and the shaft sleeve 2, a movable ring seat 12 which can only axially move relative to the spring seat 8 and can not rotate relative to the spring seat 8 is arranged outside the spring seat 8, a second seal ring 13 for contacting and sealing the gap between the movable ring seat 12 and the spring seat 8 is arranged between the movable ring seat 12 and the spring seat, a split type movable ring 14 facing the split type static ring 9 is embedded on the movable ring seat 12, a third seal ring 15 for sealing the gap between the split type movable ring 14 and the movable ring seat 12 is arranged between the split type movable ring seat, a spring 16 is arranged between the movable ring seat 12 and the spring seat 8, and under the combined action of the elasticity of the spring 16 and the internal pressure of the equipment side, the movable ring seat 12 can axially move towards the atmosphere side relative to the spring seat 8 all the time until the split movable ring 14 can rotatably and hermetically attach to the split static ring 9;

in this embodiment, the specific structure of the air path includes: the outer circumferential surface of the pneumatic sealing lining ring 6 which is in sealing contact with the inner circumferential surface of the pneumatic sealing cavity 4 is provided with a circle of annular groove 17, the bottom of the annular groove 17 is circumferentially provided with a plurality of air holes 18 which radially penetrate through the pneumatic sealing lining ring 6, the split gland 3 is internally provided with an air passage 19 which is used for communicating an external air source with the annular groove 17, and the air passage 19, the annular groove 17 and the air holes 18 together form an air passage which can lead the air of the external air source to be introduced into the annular inflatable body 7;

in this embodiment, the split gland 3 is provided with a flushing port 20 for communicating a flushing fluid outlet of the flushing device with the inside of the mechanical seal cavity 5, so that during actual operation, flushing fluid of the flushing device can be introduced into the mechanical seal cavity 5 through the flushing fluid outlet and the flushing port 20, and then enters the pump cavity on the equipment side through a gap between the split gland 3 and the shaft sleeve 2, and in the process of flowing through the mechanical seal cavity 5, the flushing fluid can take away heat generated by friction between the split movable ring 14 and the split stationary ring 9, so that online real-time cooling of the split movable ring 14 and the split stationary ring 9 is realized, and the operation stability of the equipment is improved;

in this embodiment, the specific connection structure between the spring seat 8 and the moving ring seat 12 includes: a plurality of axial guide holes 21 are circumferentially formed in the end face of the spring seat 8 opposite to the moving ring seat 12, a plurality of guide pins 22 protruding out of the end face of the moving ring seat 12 are circumferentially formed in the end face of the moving ring seat 12 opposite to the spring seat 8, the guide pins 22 of the moving ring seat 12 correspond to the axial guide holes 21 of the spring seat 8 one by one, and each guide pin 22 is inserted into the corresponding axial guide hole 21, so that the moving ring seat 12 can only axially move relative to the spring seat 8 and cannot rotate relative to the spring seat 8, and the structure is simple and convenient to install and maintain; in the embodiment, the end face of the spring seat 8 opposite to the movable ring seat 12 is provided with a spring positioning groove for positioning and placing the spring 16, so that the spring is more conveniently assembled, and the assembly efficiency is improved; in the embodiment, the two axial end faces of the split type static ring 9 are both wear-resistant sealing faces 91, when one end face of the split type static ring 9 is damaged due to continuous friction with the split type movable ring, the split type static ring can be turned to the end face of the other side which is not used to be rubbed with the split type movable ring, and the double-face usable design of the split type static ring reduces the use cost of equipment;

in the present embodiment, the specific connection structure between the split stationary ring 9 and the split gland 3 includes: a circle of stationary ring positioning grooves are arranged on the inner wall of the mechanical seal cavity 5 in the split gland 3, a circle of positioning protrusions 92 which are just embedded into the stationary ring positioning grooves 9 are arranged on the outer peripheral surface of the split stationary ring 9, the split stationary ring 9 is embedded on the inner wall of the mechanical seal cavity 5 of the split gland 3 by inserting the positioning protrusions 92 into the stationary ring positioning grooves, and fourth seal rings 23 for gaps between the split stationary ring 9 and the split gland 3 are arranged between the positioning protrusions 92 and the inner wall of the stationary ring positioning grooves, so that the structure is simple and the installation and maintenance are convenient; in the embodiment, the split gland 3 is provided with the fluid leakage port 24 for communicating the gap between the split stationary ring 9 and the shaft sleeve 2, and whether the sealing of the device on the shaft end fails or not is quickly judged by observing whether the fluid leakage port 24 has fluid flowing out or not; in the embodiment, a sewage draining outlet 25 communicated with the inside of the mechanical seal cavity 5 is further arranged in the split gland 3, a sealing plug is arranged at the sewage draining outlet 25, when in maintenance, fluid in the mechanical seal cavity 5 can be drained through the sewage draining outlet, and then the parts of the device are disassembled and assembled for maintenance;

when in use, under the combined action of the elastic force of the spring 16 and the internal pressure of the equipment side, the movable ring seat 12 can axially move to the atmosphere side relative to the spring seat 8 all the time until the split movable ring 14 can rotatably seal and attach to the split static ring 9; effective mechanical sealing of the shaft end is achieved through the cooperation of the first sealing ring 11, the second sealing ring 13, the third sealing ring 15 and the fourth sealing ring 23; when a worker observes that fluid flows out of the fluid leakage port 24, the mechanical seal is judged to be failed at the moment, gas (such as nitrogen) of an external gas source is led into the annular inflatable body 7 through the gas channel 19, the annular groove 17 and the gas holes 18 in sequence at the moment, and after the gas is led into the annular inflatable body 7, the annular inflatable body 7 can expand inwards and radially to be in sealing contact with the outer peripheral surface of the shaft sleeve 2, so that a gap between the split type gland 3 and the shaft sleeve 2 is sealed, the continuous leakage of the fluid is effectively prevented, and the use safety is improved.

The utility model has the advantages that: (1) under the combined action of the elasticity of the spring and the internal pressure of the equipment side, the movable ring seat can axially move to the atmosphere side relative to the spring seat all the time until the split movable ring can rotatably seal and attach to the split static ring; effective mechanical sealing of the shaft end is realized through the common matching of the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring, and the sealing performance is high; (2) the split gland, the partial movable ring and the split static ring in the shaft seal device are all in split structures, so that the shaft seal device is very convenient to disassemble and assemble, the shaft seal device is replaced under the condition of not disassembling all shaft end matching pieces above the shaft seal device, the maintenance period is greatly shortened, the maintenance cost is reduced, and the maintenance efficiency is improved; (3) through the design of the flushing port, the split type movable ring and the split type static ring are cooled on line in real time, and the running stability of the equipment is improved; (4) the split type stationary ring adopts a double-sided usable design, so that the use cost of equipment is reduced; (5) through the design of the inflatable body, when mechanical seal became invalid, let in the annular inflatable body with the gas of outside air supply, make the sealed contact shaft sleeve outer peripheral face of the inside radial expansion of annular inflatable body, sealed split gland and the clearance between the axle sleeve to effectively prevent the continuous leakage of fluid, improved the safety in utilization.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modifications or equivalent changes made in accordance with the technical spirit of the present invention are also within the scope of the present invention.

Claims

1. Half subdivision formula axle head mechanical seal device, its characterized in that: the pneumatic sealing device comprises a shaft sleeve fixedly sleeved at the shaft end, a split type gland fixed with an equipment shell is sleeved outside the shaft sleeve, a pneumatic sealing cavity and a mechanical sealing cavity are sequentially arranged on the inner circumferential surface of the split type gland at intervals from the equipment side to the atmosphere side along the axial direction, a pneumatic sealing lining ring is fixedly installed on the inner circumferential surface of the pneumatic sealing cavity, an annular inflatable body in contact and sealing with the inner wall of the pneumatic sealing cavity is coated outside the pneumatic sealing lining ring, the annular inflatable body can be communicated with an external air source through an air passage, and when the external air source introduces air into the annular inflatable body through the air passage, the annular inflatable body can be expanded inwards and radially to be in sealing contact with the outer circumferential surface of the shaft sleeve, so that a gap between the split type gland and the shaft sleeve is sealed; a spring seat and a split type static ring are sequentially arranged in the mechanical seal cavity along the axial direction from the equipment side to the atmosphere side at intervals, the split type static ring is fixed with a split type gland, the spring seat is fixedly sleeved on a shaft sleeve, a first sealing ring for sealing a gap between the spring seat and the shaft sleeve is arranged between the spring seat and the shaft sleeve, a moving ring seat which can only axially move relative to the spring seat and cannot rotate relative to the spring seat is arranged outside the spring seat, a second sealing ring for contacting and sealing the gap between the moving ring seat and the spring seat is arranged between the moving ring seat and the spring seat, a split type moving ring facing the split type static ring is embedded on the moving ring seat, a third sealing ring for sealing the gap between the split type moving ring and the moving ring seat is arranged between the split type moving ring seat and the moving ring seat, and a spring is arranged between the moving ring seat and the spring seat, and under the combined action of the elasticity of the spring and the internal pressure of the equipment side, the moving ring seat can always axially move towards the large gas side relative to the split type moving ring to be rotatably sealed and jointed with the split type moving ring in a rotary way And (4) a stationary ring.

2. The half-split shaft end mechanical seal device according to claim 1, wherein: the concrete structure of gas circuit includes: the pneumatic sealing lining ring is characterized in that a circle of annular groove is formed in the outer peripheral surface of the pneumatic sealing lining ring in sealing contact with the inner peripheral surface of the pneumatic sealing cavity, a plurality of air holes which radially penetrate through the pneumatic sealing lining ring are formed in the bottom of the annular groove along the circumferential direction, an air passage for communicating an external air source with the annular groove is formed in the split type gland, and the air passage, the annular groove and the air holes form an air passage which enables the air of the external air source to be introduced into the annular inflatable body.

3. The half-split shaft end mechanical seal device according to claim 1 or 2, characterized in that: the split gland is provided with a flushing port for communicating a flushing liquid outlet of the flushing device with the interior of the mechanical seal cavity.

4. The half-split shaft end mechanical seal device according to claim 1 or 2, characterized in that: concrete connection structure between spring holder and the rotating ring seat includes: the end face of the spring seat opposite to the moving ring seat is circumferentially provided with a plurality of axial guide holes, the end face of the moving ring seat opposite to the spring seat is circumferentially provided with a plurality of guide pins protruding out of the end face of the moving ring seat, the guide pins of the moving ring seat are in one-to-one correspondence with the axial guide holes of the spring seat, and each guide pin is inserted into the corresponding axial guide hole, so that the moving ring seat can only axially move relative to the spring seat and cannot rotate relative to the spring seat.

5. The half-split shaft end mechanical seal device according to claim 4, wherein: the end face of the spring seat opposite to the movable ring seat is provided with a spring positioning groove for positioning and placing a spring.

6. The half-split shaft end mechanical seal device according to claim 1, wherein: concrete connection structure between subdivision formula stationary ring and the subdivision formula gland includes: the mechanical seal cavity inner wall in the split gland is provided with a circle of stationary ring positioning groove, the peripheral surface of the split stationary ring is provided with a circle of positioning bulge just embedded into the stationary ring positioning groove, the split stationary ring is embedded on the mechanical seal cavity inner wall of the split gland by inserting the positioning bulge into the stationary ring positioning groove, and a fourth sealing ring for a gap between the split stationary ring and the split gland is arranged between the positioning bulge and the stationary ring positioning groove inner wall.

7. The half-split shaft end mechanical seal device according to claim 1 or 2, characterized in that: and a fluid leakage port for communicating a gap between the split stationary ring and the shaft sleeve is arranged on the split gland.