CN112539176A

CN112539176A - Dry gas sealing Roots blower

Info

Publication number: CN112539176A
Application number: CN201910899415.XA
Authority: CN
Inventors: 陈光华; 丁印恕
Original assignee: Shandong Tomorrow Machinery Group Co ltd
Current assignee: Shandong Tomorrow Machinery Group Co ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2021-03-23

Abstract

The invention discloses a dry gas sealing Roots blower, which comprises a shell, a driving shaft, a driven shaft, impellers, a water-cooling auxiliary oil tank and a water-cooling main oil tank, wherein the driving shaft and the driven shaft are respectively provided with the impellers, one end of the driving shaft penetrates through the auxiliary oil tank to extend to the outside and is connected with a motor main shaft, the other end of the driving shaft is arranged in the water-cooling main oil tank, one end of the driven shaft is arranged in an inner cavity of the water-cooling auxiliary oil tank, the other end of the driven shaft is arranged in the water-cooling main oil tank, both ends of the driving shaft and the driven shaft are respectively provided with dry gas seals, the two dry gas seals at the same end of the driving shaft; the four dry gas sealed gas inlets are respectively connected with a set of flushing system. This air-blower can save the wallboard size through rationally setting up the dry gas seal, reduces the length of minor axis, increases the intensity of axle, reduces the disturbed deformation of axle, simple to operate, and is with low costs, and operating stability is strong, and the maintenance cycle is long.

Description

Dry gas sealing Roots blower

Technical Field

The invention relates to equipment manufacturing in the mechanical manufacturing industry, in particular to a dry gas sealing Roots blower.

Background

At present, the roots blower used for treating organic gas, waste gas, tail gas and the like in the petrochemical industry basically adopts four-shaft mechanical seal extension, a PLAN52 or 53 scheme is generally applied to a mechanical seal flushing scheme, the scheme is complex in structure and high in cost, the roots blower is different from general pump equipment, a general pump only needs one mechanical seal, but the roots blower needs four mechanical seals, each mechanical seal needs one set of flushing scheme, and the cost is increased greatly among intangible states.

Disclosure of Invention

The invention aims to provide a dry gas seal roots blower, which can save the size of a wall plate of the roots blower, reduce the length of a short shaft, increase the strength of the shaft, reduce the disturbing deformation of the shaft, and has the advantages of simple structure, convenient installation, low cost, strong operation stability and long maintenance period by reasonably arranging the dry gas seal.

The technical scheme adopted by the invention for solving the technical problems is as follows: the dry gas sealed Roots blower structurally comprises a casing, a driving shaft, a driven shaft, an impeller, a water-cooled auxiliary oil tank and a water-cooled main oil tank, the driving shaft and the driven shaft are respectively provided with an impeller, one end of the casing is provided with a water-cooling auxiliary oil tank, the other end of the casing is provided with a water-cooling main oil tank, the end part of the auxiliary oil tank is provided with an auxiliary oil tank gland, one end of the driving shaft passes through the auxiliary oil tank to extend to the outside and is connected with the main shaft of the motor, the other end of the driving shaft is arranged in the water-cooling main oil tank, one end of the driven shaft is arranged in the inner cavity of the water-cooling auxiliary oil tank, the other end of the driven shaft is arranged in the water-cooling main oil tank, the end parts of the driving shaft and the driven shaft are respectively driven by gears, the two ends of the driving shaft and the driven shaft are respectively provided with dry gas seals, the two dry gas seals at the same end of the driving shaft and the driven shaft have opposite rotation directions, one end of the dry gas seal is connected with the wall plate, and the other end of the dry gas seal is connected with the side part of the main oil tank or the auxiliary oil tank through a bearing and a bearing seat; the four dry gas sealed gas inlets are respectively connected with a set of flushing system.

Further, the dry gas seal is sleeved with the driven shaft or the driving shaft, one end of the dry gas seal is connected with the wall plate through a bolt, the bearing seat is installed on the side part of the water-cooling main oil tank or the water-cooling auxiliary oil tank through the bolt, a framework oil seal is arranged on the bearing seat, the bearing is installed on the bearing seat and is fastened through a round nut, and a space for clamping the dry gas seal is formed between the bearing and the impeller.

Further, one end of the driving shaft and one end of the driven shaft are provided with a driving end bearing, the other end of the driving shaft and the driven shaft are provided with a tooth end bearing, the driving end bearing is a positioning bearing, and the tooth end bearing is a non-positioning bearing.

Further, the flushing system adopts a PLAN32 flushing scheme and comprises a panel, a pressure gauge, a flow meter, a valve, a sealing air interface and a sealing air outlet, wherein the panel is provided with the pressure gauge and a pipeline, the pipeline is provided with the flow meter and the valve, one end of the pipeline is provided with the sealing air interface, and the other end of the pipeline is provided with the sealing air outlet which is hermetically connected with dry air.

Further, the dry gas seal comprises a fan rotor shaft, a dry gas seal shaft sleeve, a movable ring assembly, a static ring assembly and a comb tooth seal assembly, the dry gas seal shaft is sleeved on the fan rotor shaft, the movable ring assembly is fixed on the dry gas seal shaft sleeve, the dry gas seal shaft sleeve and the movable ring assembly are driven to rotate together by the rotation of the fan, and a gas film is formed between the rotation of the movable ring assembly and the static ring assembly; the comb tooth sealing assembly and the dry gas sealing shaft sleeve form a comb tooth seal capable of effectively reducing gas leakage.

The invention has the beneficial effects that:

1. the dry gas seal is applied to the roots blower, and the PLAN32 flushing scheme is adopted, the dry gas seal adopted by the flushing scheme is a single-end-face dry gas seal, the flushing scheme is simple to configure, the single-end-face dry gas seal is small in installation size, the wall plate size of the roots blower can be saved, the length of a short shaft is reduced, the shaft strength is increased, and the disturbing deformation of the shaft is reduced.

2. Because the dry gas seal is arranged between the impeller and the bearing, the gap between the impeller and the casing can be positioned by the assembling mode of sealing and oppositely clamping the dry gas through the impeller and the bearing.

3. The sealed gas of dry gas seal through the sealed gas import input at top, and the rotating ring subassembly of dry gas seal rotates and forms the air film between the quiet ring subassembly, because the swivelling chute effect above the rotating ring subassembly forms the air film between the quiet ring of moving, plays sealed effect, prevents that sealed gas and process medium from leaking outward, and the production of air film makes the quiet ring of moving not have actual contact, need not the lubrication to can guarantee that process medium leaks to the atmosphere end, play sealed effect.

4. Still be equipped with broach seal assembly in the dry gas seal, form the broach through broach seal assembly and dry gas seal axle sleeve and seal, leak in can limited reduction sealed gas.

Drawings

FIG. 1 is a cross-sectional view of a drive shaft;

FIG. 2 is a cross-sectional view of the driven shaft;

FIG. 3 is a left side view of the present invention;

FIG. 4 is a schematic diagram of the internal structure of the dry gas seal;

FIG. 5 is a use state diagram;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a left side view of FIG. 5;

fig. 8 is a schematic view of a flushing system.

In the figure:

1 machine shell, 2 wall plates, 3 screwed plugs I, 4 water-cooled auxiliary oil tanks, 5 auxiliary oil tank gland covers, 6 oil seal I, 7 sealing check rings, 8 screwed plugs II, 9 oil windows, 10 water-cooled main oil tanks, 11 driving shafts, 12 round nuts, 13 stop washer I, 14 impellers, 15 bolts, 16 spring washers, 17 bearing seats, 18 taper pins, 19 bearings, 20 oil throwers, 21 driving end bearings, 22 oil seal II, 23 spacing sleeves, 24 tooth end bearings, 25 gears, 26 round nuts, 27 stop washer II, 28 driven shafts, 29 dry gas seals, 291 dry gas seal shaft sleeves, 292 static ring components, 293 moving ring components, 294 comb seal components, 295 seal gas inlets, 30 flushing systems, 301 panels,

pressure gauges

302, 303 flow meters, 304 valves, seal gas interfaces, 306 seal gas outlets, 31 seal gaskets, 32

motors

305, 33 shields, 34 inlet connecting pipes, 35 metal corrugated pipes, 36 silencers, 37 axial flow fans, 6 water-cooled main oil tanks, 11 driving shafts, 12 round nuts, 13 stop washers, 38 sound attenuation rooms, 39 bases, 40 anchor bolts and 41 outlet connecting pipes.

Detailed Description

The dry gas sealed roots blower of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the dry gas seal roots blower of the invention comprises a casing 1, a driving shaft 11, a driven shaft 28, an impeller 14, a water-cooling auxiliary oil tank 4 and a water-cooling main oil tank 10, wherein the driving shaft 11 and the driven shaft 28 are respectively provided with the impeller 14, one end of the casing 1 is provided with the water-cooling auxiliary oil tank, the other end is provided with the water-cooling main oil tank, the main oil tank and the auxiliary oil tank are connected with a side plate through a sealing gasket and a bolt, the end part of the auxiliary oil tank is provided with an auxiliary oil tank gland 5, one end of the driving shaft 11 passes through the auxiliary oil tank to extend to the outside and is connected with a motor main shaft, the joints of the driving shaft and the driven shaft and the auxiliary oil tank are respectively provided with oil seals, the other end is arranged in the water-cooling main oil tank 10, one end of the driven shaft is arranged in an inner cavity of the, the upper end of the water-cooling auxiliary oil tank is provided with a first screwed plug 3, and the lower end of the water-cooling auxiliary oil tank is provided with a second screwed plug 8. An oil window 9 is arranged on the outer side of the water-cooling main oil tank, a first stop washer 13 is arranged between the end portion, arranged in the water-cooling main oil tank, of the driving shaft 11 and the gear, a second stop washer 27 is arranged between the end portion, arranged in the water-cooling main oil tank, of the driven shaft and the gear, and the driven shaft is fastened through a round nut 26. An oil thrower 20 is further arranged in the auxiliary oil tank, a first oil seal 6 and a second oil seal 23 are arranged at the joint of the driving shaft and the auxiliary oil tank through a bearing, a second spacer sleeve and a second oil seal 22 are arranged at the joint of the driven shaft and the auxiliary oil tank through a bearing, dry gas seals 29 are respectively arranged at two ends of the driving shaft 11 and the driven shaft 28, the two dry gas seals at the same end of the driving shaft and the driven shaft are opposite in rotation direction, one end of each dry gas seal plate is connected with the wall plate 2, and the other end of each dry gas seal plate is connected with the side part of the; the four dry gas sealed gas inlets are respectively connected with a set of flushing system 30. Because the two rotors of the Roots blower rotate in opposite directions, one rotor rotates clockwise and the other rotor rotates anticlockwise, the dry gas seal rotation direction needs to be configured according to the rotation directions of the two rotors of the Roots blower when the dry gas seal is configured. The rotating direction can be indicated on the dry gas seal, so that the installation is convenient, and the error in the installation process is prevented.

As shown in fig. 5, 6 and 7, the shaft end of the driving shaft 11 of the blower is connected with the motor 32, and a shield 33 is arranged at the connection part for protection. The motor 32 and the blower are arranged on a base 39, the base is fixedly arranged with the ground through a plurality of anchor bolts 40, the upper part of the blower is connected with a silencer 36 through an inlet connecting pipe 34 and a metal corrugated pipe 35, and an air outlet of the blower is also connected with a silencer 36 through an outlet connecting pipe 41 and the metal corrugated pipe 35. The outside of the whole system is wholly silenced by arranging a silencing room, the silencing room is provided with an axial flow fan 37, and noise generated by the whole system is eliminated by the silencing room 38. Four dry gas seals are respectively provided with a PLAN32 flushing scheme, and four sets of flushing devices are arranged outside the silencing room and are respectively installed with the ground through a support.

The dry gas seal 29 is sleeved with the driven shaft or the driving shaft, one end of the dry gas seal is connected with the wallboard 2 through a bolt, a spring washer 16 is arranged between a nut of the bolt and the wallboard, and a taper pin 8 is arranged below the bolt at the joint of the wallboard and the casing. The bearing seat 17 is installed on the side portion of the water-cooling main oil tank 10 or the water-cooling auxiliary oil tank through bolts, the framework oil seal 6 is arranged on the bearing seat, the bearing 19 is installed on the bearing seat 17 and fastened through a round nut, and a space for clamping dry gas seal is formed between the bearing 19 and the impeller 14. The assembly mode that the impeller and the bearing are used for sealing and oppositely clamping dry gas is adopted, and the gap between the impeller and the casing can be positioned.

One end of the driving shaft and one end of the driven shaft are provided with a driving end bearing 21, the other end of the driving shaft and the driven shaft are provided with a tooth end bearing 24, the driving end bearing 21 is a positioning bearing, and the tooth end bearing 24 is a non-positioning bearing. The positioning bearing is fixed by inner and outer rings such as a deep groove ball bearing or a self-aligning roller bearing. The tooth end bearing is a cylindrical roller bearing, and the bearing is a non-positioning bearing with an inner ring and an outer ring separated. The positioning end and the non-positioning end of the blower are determined through the positioning bearing and the non-positioning bearing, and the adjustment of the gap between the impeller and the casing of the blower is realized.

As shown in fig. 8, the flushing system 30 adopts a PLAN of PLAN32 flushing, and includes a panel 301, a pressure gauge 302, a flow meter 303, a valve 304, a sealing air port 305, a sealing air outlet 306, a pressure gauge and a pipeline on the panel, wherein the pipeline is provided with the flow meter and the valve, one end of the pipeline is provided with the sealing air port, and the other end of the pipeline is provided with the sealing air outlet 306 connected with the sealing air inlet 295 on the upper portion of the dry air seal.

The dry gas seal 29 comprises a fan rotor shaft, a dry gas seal shaft sleeve 291, a movable ring component 293, a static ring component 292 and a comb seal component 294, the dry gas seal shaft is sleeved on the fan rotor shaft and is clamped tightly by a bearing and an impeller, the movable ring component is fixed on the dry gas seal shaft sleeve, the fan rotates to drive the dry gas seal shaft sleeve to rotate together with the movable ring component, an air film is formed between the movable ring component and the static ring component, a rotary groove on the movable ring component acts on the movable ring and the static ring to form an air film, a sealing effect is achieved, sealing gas and process media are prevented from leaking outwards, the comb seal component and the dry gas seal shaft sleeve form comb seal, and sealing gas leakage can be reduced in a limited mode. The generation of the air film ensures that the moving ring and the static ring do not have actual contact, does not need lubrication, can ensure that a process medium leaks to the atmosphere end, and plays a role in sealing.

The flushing gas reaches a sealing gas inlet (NPT1/4) through a flushing scheme PLAN32 and enters the dry gas sealing cavity, and the pressure of the flushing gas is 0.02MPa higher than that of the medium, so that no process medium enters the sealing cavity. The comb tooth assembly ensures that a large amount of flushing gas can not leak towards the interior of the working cavity of the fan, and a small amount of flushing gas leaks towards the working cavity, so that the selected flushing gas must be gas which can not react with a process medium, and inert gas such as nitrogen is selected as the flushing gas. The rotating ring assembly and the static ring assembly form a pair of sealing combination, after the fan operates, the rotating ring can rotate along with the fan shaft due to the fact that the rotating groove is formed in the end face of the rotating ring, the rotating speed is synchronous with the rotating speed of the fan, when flushing gas enters the middle of the static ring, the air film is formed between the static ring and the moving ring due to the rotating groove formed in the end face of the rotating ring, and the static ring and the moving ring are not in actual contact due to the appearance of the air film, so that lubrication is not needed. The appearance of the air film can also ensure that the process medium leaks to the atmosphere end, so that the sealing effect is achieved.

The dry gas seal is applied to the roots blower, and the PLAN32 flushing scheme is adopted, the dry gas seal adopted by the flushing scheme is a single-end-face dry gas seal, the flushing scheme is simple to configure, the single-end-face dry gas seal is small in installation size, the wall plate size of the roots blower can be saved, the length of a short shaft is reduced, the shaft strength is increased, and the disturbing deformation of the shaft is reduced. The dry gas seal flushing fluid is inert gas-nitrogen (the owner factory needs a nitrogen making machine, and the nitrogen making machine of the petrochemical company is in standard configuration). The machine operation has in the flush fluid to leak to the medium in the middle of, because nitrogen gas is inert gas, can not react with the technology medium to it is little to leak the volume, so the application of mechanical seal roots blower in petrochemical industry can be replaced to this scheme. Compared with a mechanical sealing structure, the mechanical sealing structure is simple, convenient to install, low in cost, strong in operation stability and long in maintenance period.

While the foregoing is directed to the principles of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Other technical features than those described in the specification are known to those skilled in the art.

Claims

1. A dry gas sealed Roots blower comprises a casing, a driving shaft, a driven shaft, an impeller, a water-cooled auxiliary oil tank and a water-cooled main oil tank, the driving shaft and the driven shaft are respectively provided with an impeller, one end of the casing is provided with a water-cooling auxiliary oil tank, the other end of the casing is provided with a water-cooling main oil tank, the end part of the auxiliary oil tank is provided with an auxiliary oil tank gland, one end of the driving shaft passes through the auxiliary oil tank to extend to the outside and is connected with the main shaft of the motor, the other end of the driving shaft is arranged in the water-cooling main oil tank, one end of the driven shaft is arranged in the inner cavity of the water-cooling auxiliary oil tank, the other end of the driven shaft is arranged in the water-cooling main oil tank, the end parts of the driving shaft and the driven shaft are respectively driven by gears, it is characterized in that both ends of the driving shaft and the driven shaft are respectively provided with dry gas seals, the two dry gas seals at the same end of the driving shaft and the driven shaft have opposite rotation directions, one end of the dry gas seal is connected with the wall plate, and the other end of the dry gas seal is connected with the side part of the main oil tank or the auxiliary oil tank through a bearing and a bearing seat; the four dry gas sealed gas inlets are respectively connected with a set of flushing system.

2. The dry gas seal roots blower according to claim 1, wherein the dry gas seal is sleeved on the driven shaft or the driving shaft, one end of the dry gas seal is connected with the wall plate through a bolt, the bearing seat is mounted on the side part of the water-cooled main oil tank or the water-cooled auxiliary oil tank through a bolt, a skeleton oil seal is arranged on the bearing seat, the bearing is mounted on the bearing seat and is fastened through a round nut, and a space for clamping the dry gas seal is formed between the bearing and the impeller.

3. The dry gas seal roots blower of claim 2 wherein the drive and driven shafts are provided with drive end bearings at one end and with tooth end bearings at the other end, the drive end bearings being locating bearings and the tooth end bearings being non-locating bearings.

4. The dry gas seal roots blower of claim 1 or 2, wherein the flushing system adopts a PLAN32 flushing scheme, and comprises a panel, a pressure gauge, a flow meter, a valve, a seal gas interface, a seal gas outlet, wherein the panel is provided with the pressure gauge and a pipeline, the pipeline is provided with the flow meter and the valve, one end of the pipeline is provided with the seal gas interface, and the other end of the pipeline is provided with the seal gas outlet hermetically connected with the dry gas.

5. The dry gas seal Roots blower according to claim 1 or 2, wherein the dry gas seal comprises a blower rotor shaft, a dry gas seal shaft sleeve, a moving ring assembly, a stationary ring assembly and a comb seal assembly, the dry gas seal shaft is sleeved on the blower rotor shaft, the moving ring assembly is fixed on the dry gas seal shaft sleeve, the dry gas seal shaft sleeve and the moving ring assembly are driven to rotate together by the rotation of the blower, and a gas film is formed between the rotation of the moving ring assembly and the stationary ring assembly; the comb tooth sealing assembly and the dry gas sealing shaft sleeve form a comb tooth seal capable of effectively reducing gas leakage.